NAITO Hiroyoshi

J-GLOBAL         Last updated: Nov 27, 2019 at 22:00
 
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Name
NAITO Hiroyoshi
E-mail
naitope.osakafu-u.ac.jp
Affiliation
Osaka Prefecture University
Section
Graduate School of Engineering, Division of Electronics, Mathematics and Physics, Osaka Prefecture University Graduate School, Division of Engineering Physics and Electronics
Job title
Professor
Degree
Study on localized states and charge carrier transport in amorphous semiconductors(Osaka Prefecture University)
Research funding number
90172254
ORCID ID
0000-0002-8138-6077

Research Areas

 
 

Academic & Professional Experience

 
1984
 - 
1991
Research Associate, Faculty of Engineering,
 
 
   
 
Osaka Prefecture University
 
1991
 - 
1991
Lecturer, Faculty of Engineering,
 
 
   
 
Osaka Prefecture University
 
1991
 - 
2000
Associate Professor, Faculty of Engineering,
 

Education

 
 
 - 
1984
Graduate School, Division of Engineering, Osaka Prefecture University
 
 
 - 
1979
Faculty of Engineering, Osaka Prefecture University
 

Awards & Honors

 
Jun 2019
Performance improvement of solution-processed optical organic transistor memories using binary small molecules dispersed polymer storage layers, Student Presentation Award, Tenth International Conference on Molecular Electronics and Bioelectronics
Winner: Hayato Abe
 
Dec 2018
Enhanced field-effect mobility of top-gate organic transistors with channel length of 5 μm using solution-processed MoO3 hole injection layers, Outstanding Poster Award, The 25th International Display Workshops (IDW’18)
Winner: Tomoya Aiba, Takashi Nagase, Takashi Kobayashi, Yuichi Sadamitsu, Hiroyoshi Naito
 
Sep 2018
FELLOW, Japan Society of Applied Physics
 
2003
The Best Presentation Award at European Conference on Organic Electronics and Related Phenomena 2003
 
2000
The paper award of Japanese Liquid Crystal Society
 
1999
The Best Presentation Award at Pattern Formation of Liquid Crystals '99
 

Published Papers

 
Shoya Sanda, Ryousuke Nakamichi, Takashi Nagase, Takashi Kobayashi, Kazuo Takimiya, Yuichi Sadamitsu, Hiroyoshi Naito
Organic Electronics   69 181-189   Jun 2019
© 2019 Elsevier B.V. The use of non-chlorinated solvents for film deposition in organic field-effect transistors (OFETs) is highly desirable to fabricate flexible and printable electronic circuits by environmentally friendly processes. Here, we in...
Hiroki Nojima, Takashi Kobayashi, Takashi Nagase, Hiroyoshi Naito
Journal of Physics: Conference Series   1220    May 2019
© Published under licence by IOP Publishing Ltd. Modified modulation photocurrent (MPC) measurements were carried out to investigate the carrier transport process in organic photovoltaics based on polymer and fullerene derivatives. In conventional...
Fumiya Shiono, Hayato Abe, Takashi Nagase, Takashi Kobayashi, Hiroyoshi Naito
Organic Electronics   67 109-115   Apr 2019
© 2019 Elsevier B.V. Exploring optical memory functions in nonvolatile organic field-effect transistor (OFET) memories with top-gate/bottom-contact (TG/BC) configurations can offer effective routes for developing printable, high-density organic me...
Mitsuru Kikuchi, Masaki Hirota, Thidarat Kunawong, Yusuke Shinmura, Masahiro Abe, Yuichi Sadamitsu, Aye Myint Moh, Seiichiro Izawa, Masanobu Izaki, Hiroyoshi Naito, Masahiro Hiramoto
ACS Applied Energy Materials   2 2087-2093   Mar 2019
© 2019 American Chemical Society. Blended junctions are indispensable for organic solar cells; however, the fabrication of electron and hole transport routes in blended cells remains quite challenging. Herein, a lateral alternating multilayered ju...
Tasuku Honda, Masaya Nagahara, Naohiro Taka, Jun ichi Nishida, Takeshi Kawase, Katsuhiko Ono, Takashi Kobayashi, Hiroyoshi Naito, Chitoshi Kitamura
European Journal of Organic Chemistry   2019 2107-2114   Mar 2019
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim A soluble directly 2,2′-linked tetracene dimer was synthesized. Dimerization of 8-bromo-2,3-dihexyl-5,12-tetracenequinone afforded the corresponding bitetracenequinone, which was converted into ...
Makoto Takada, Takahiro Mayumi, Takashi Nagase, Takashi Kobayashi, Hiroyoshi Naito
Applied Physics Letters   114(12) 123301   Mar 2019   [Refereed]
Jun ichi Takahashi, Hiroyoshi Naito
Organic Electronics   61 10-17   Oct 2018
© 2018 Elsevier B.V. Carrier transport behavior in organic light emitting diode (OLED) is visualized by Modulus spectroscopy using typical layered devices ITO/α-NPD/Alq3/LiF/Al. Two techniques of Modulus analysis, Dynamic Modulus Plot (DMP) and Di...
Yasunori Matsui, Minoru Shigemori, Toshiyuki Endo, Takuya Ogaki, Eisuke Ohta, Kazuhiko Mizuno, Hiroyoshi Naito, Hiroshi Ikeda
Research on Chemical Intermediates   44 4765-4774   Aug 2018
© 2018, Springer Science+Business Media B.V., part of Springer Nature. The semiconductor properties of the earliest known stable radical, α,γ-bisdiphenylene-β-phenylallyl radical (Koelsch radical, 1•) were assessed using spectroscopic and electric...
Takashi Nagase, Takeshi Hirose, Takashi Kobayashi, Rieko Ueda, Akira Otomo, Hiroyoshi Naito
Applied Sciences   8(8) 1274   Aug 2018   [Refereed]
Hideyuki Hatta, Yuhi Miyagawa, Takashi Nagase, Takashi Kobayashi, Takashi Hamada, Shuichi Murakami, Kimihiro Matsukawa, Hiroyoshi Naito
Applied Sciences   8(9) 1493   Aug 2018   [Refereed]
Shoya Sanda, Takashi Nagase, Takashi Kobayashi, Kazuo Takimiya, Yuichi Sadamitsu, Hiroyoshi Naito
Organic Electronics   58 306-312   Jul 2018
© 2018 Elsevier B.V. We have investigated the effect of organic solvents that are used for spin coating 2,7-didodecyl[1]benzothieno[3,2-b][1]benzothiophene (C12-BTBT) on the electrical characteristics of organic field-effect transistors (OFETs) ha...
Takashi Kobayashi, Akitsugu Niwa, Shota Haseyama, Kensho Takaki, Takashi Nagase, Kenichi Goushi, Chihaya Adachi, Hiroyoshi Naito
Journal of Photonics for Energy   8    Jul 2018
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). A four-level model consisting of a higher triplet excited state (T2), the lowest singlet and triplet excited states (S1 and T1), and the ground state was previously used to understa...
Shunichi Fujii, Saori Minami, Kenji Urayama, Yu Suenaga, Hiroyoshi Naito, Orito Miyashita, Hiroaki Imoto, Kensuke Naka
ACS Macro Letters   7 641-645   Jun 2018
© 2018 American Chemical Society. Solvent-based deposition techniques for fabrication of organic field-effect transistors (OFETs) generally require orthogonal solvents for deposition of a conjugated polymer layer on a polymer gate insulator layer....
Yasuchika Hasegawa, Shiori Natori, Jun Fukudome, Takashi Nagase, Takashi Kobayashi, Takayuki Nakanishi, Yuichi Kitagawa, Koji Fushimi, Hiroyoshi Naito
Journal of Physical Chemistry C   122 9599-9605   May 2018
© Copyright 2018 American Chemical Society. Lanthanide coordination polymers with charge combination parts, hole and electron transport units, [Eu(ntfa) 3 (dppcz)] n and [Eu 3 (ntfa) 9 (tpcz) 2 ] n [ntfa = 3-(2-naphthoyl)-1,1,1-trifluoroacetonate...
Molang Cai, Nobuyuki Ishida, Xing Li, Xudong Yang, Takeshi Noda, Yongzhen Wu, Fengxian Xie, Hiroyoshi Naito, Daisuke Fujita, Liyuan Han
Joule   2 296-306   Feb 2018
© 2017 Elsevier Inc. The electrical potential distribution within photovoltaic devices plays critical roles in governing charge carrier dynamics and the device performance. Here we present the electrical potential distribution within highly effici...
Yasuchika Hasegawa, Shiori Natori, Jun Fukudome, Takashi Nagase, Takayuki Nakanishi, Yuichi Kitagawa, Koji Fushimi, Hiroyoshi Naito, Takashi Kobayashi
Journal of Physical Chemistry C      Feb 2018
© 2018 American Chemical Society. Lanthanide coordination polymers with charge combination parts, hole and electron transport units, [Eu(ntfa) 3 (dppcz)] n and [Eu 3 (ntfa) 9 (tpcz) 2 ] n (ntfa = 3-(2-naphthoyl)-1,1,1-trifluoroacetonate, dppcz = ...
S. Nakami, T. Narioka, T. Kobayashi, T. Nagase, H. Naito
Journal of Physics: Conference Series   924    Dec 2017
© Published under licence by IOP Publishing Ltd. The dependence of active-layer thickness on the power conversion efficiency (PCE) of inverted organic photovoltaics (OPVs) based on poly(3-hexylthiphene) and [6,6]-phenyl-C61-butyric acid methyl est...
Takashi Nagase, Souichiro Abe, Takashi Kobayashi, Yu Kimura, Azusa Hamaguchi, Yoshinori Ikeda, Hiroyoshi Naito
Journal of Physics: Conference Series   924    Dec 2017
© Published under licence by IOP Publishing Ltd. Bottom-gate organic field-effect transistors (OFETs) based on a soluble precursor of dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) with bottom-contact source-drain electrodes chemically modi...
Mitsuru Kikuchi, Kenichiro Takagi, Hiroyoshi Naito, Masahiro Hiramoto
Organic Electronics   41 118-121   Feb 2017   [Refereed]
Kobayashi Takashi, Kinoshita Keita, Niwa Akitsugu, Nagase Takashi, Naito Hiroyoshi
Nanoscale Research Letters   12    2017   [Refereed]
Shintaku Naoto, Izawa Seiichiro, Takagi Kenichiro, Naito Hiroyoshi, Hiramoto Masahiro
Organic Electronics   50 515-520   2017   [Refereed]
Ohashi Chika, Izawa Seiichiro, Shinmura Yusuke, Kikuchi Mitsuru, Watase Seiji, Izaki Masanobu, Naito Hiroyoshi, Hiramoto Masahiro
Advanced Materials   29(23)    2017   [Refereed]
Kitamura Masatoshi, Goushi Kenichi, Ishida Takao, Mori Tatsuo, Naito Hiroyoshi, Nogi Masaya, Tsukagoshi Kazuhito, Uraoka Yukiharu, Ushijima Hirobumi, Yoshida Tsukasa
Japanese Journal of Applied Physics   56(5)    2017   [Refereed]
Takada Makoto, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Organic Electronics   50 290-295   2017   [Refereed]
Yamamoto Yuki, Yamamoto Daisuke, Takada Makoto, Naito Hiroyoshi, Arie Takayuki, Akita Seiji, Takei Kuniharu
Advanced Healthcare Materials   6(17)    2017   [Refereed]
Haseyama Shota, Niwa Akitsugu, Kobayashi Takashi, Nagase Takashi, Goushi Kenichi, Adachi Chihaya, Naito Hiroyoshi
Nanoscale Research Letters   12    2017   [Refereed]
Kobayashi Takashi, Niwa Akitsugu, Takaki Kensho, Haseyama Shota, Nagase Takashi, Goushi Kenichi, Adachi Chihaya, Naito Hiroyoshi
Physical Review Applied   7(3)    2017   [Refereed]
Makoto Takada, Suguru Furuta, Takashi Kobayashi, Takashi Nagase, Tsutomu Shinagawa, Masanobu Izaki, Hiroyoshi Naito
Journal of Applied Physics   120(18) 185501   Nov 2016   [Refereed]
Kenichiro Takagi, Takashi Nagase, Takashi Kobayashi, Hiroyoshi Naito
Applied Physics Letters   108(5) 053305   Feb 2016   [Refereed]
Hasegawa Junya, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Japanese Journal of Applied Physics   55(3)    2016   [Refereed]
Okada Jun, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Journal of Nanoscience and Nanotechnology   16(4) 3219-3222   2016   [Refereed]
Nakashima Makoto, Ooyama Yousuke, Sugiyama Takuya, Naito Hiroyoshi, Ohshita Joji
Molecules   21(6)    2016   [Refereed]
Otsura Takanori, Nakatsuka Emi, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Journal of Nanoscience and Nanotechnology   16(4) 3349-3354   2016   [Refereed]
Hasegawa Yasuchika, Sugawara Takeshi, Nakanishi Takayuki, Kitagawa Yuichi, Takada Makoto, Niwa Akitsugu, Naito Hiroyoshi, Fushimi Koji
Chempluschem   81(2) 187-193   2016   [Refereed]
Takada Makoto, Kobayashi Takashi, Nagase Takashi, Naito Hiroyoshi
Japanese Journal of Applied Physics   55(3)    2016   [Refereed]
Takagi Kenichiro, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Organic Electronics   32 65-69   2016   [Refereed]
Konishi Yu, Nagase Takashi, Kobayashi Takashi, Ueda Rieko, Terui Toshifumi, Otomo Akira, Naito Hiroyoshi
Journal of Nanoscience and Nanotechnology   16(4) 3307-3311   2016   [Refereed]
Nagase Takashi, Yoshikawa Masashi, Yamazaki Saori, Kobayashi Takashi, Michiwaki Yoshiki, Watase Seiji, Watanabe Mitsuru, Matsukawa Kimihiro, Naito Hiroyoshi
Journal of Polymer Science Part B-Polymer Physics   54(4) 509-516   2016   [Refereed]
Takata Masashi, Takagi Kenichiro, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Journal of Nanoscience and Nanotechnology   16(4) 3322-3326   2016   [Refereed]
Nakashima Makoto, Murata Noriyasu, Suenaga Yu, Naito Hiroyoshi, Sasaki Takuya, Kunugi Yoshihito, Ohshita Joji
Synthetic Metals   215 116-120   2016   [Refereed]
Sato Shuri, Takata Masashi, Takada Makoto, Naito Hiroyoshi
Journal of Nanoscience and Nanotechnology   16(4) 3368-3372   2016   [Refereed]
Sekiya Ryo, Uemura Yuichiro, Naito Hiroyoshi, Naka Kensuke, Haino Takeharu
Chemistry-a European Journal   22(24) 8198-8206   2016   [Refereed]
Yamamoto Atsushi, Matsui Yasunori, Asada Toshio, Kumeda Motoki, Takagi Kenichiro, Suenaga Yu, Nagae Kunihiko, Ohta Eisuke, Sato Hiroyasu, Koseki Shiro, Naito Hiroyoshi, Ikeda Hiroshi
Journal of Organic Chemistry   81(8) 3168-3176   2016   [Refereed]
Nakashima Makoto, Otsura Takanori, Naito Hiroyoshi, Ohshita Joji
Polymer Journal   47(11) 733-738   2015   [Refereed]
Kimura Yu, Hamaguchi Azusa, Ikeda Yoshinori, Nagase Takashi, Naito Hiroyoshi, Takimiya Kazuo, Shiro Takashi
Applied Physics Express   8(10)    2015   [Refereed]
Kimura Yu, Nagase Takashi, Kobayashi Takashi, Hamaguchi Azusa, Ikeda Yoshinori, Shiro Takashi, Takimiya Kazuo, Naito Hiroyoshi
Advanced Materials   27(4) 727-732   2015   [Refereed]
Okada Naoya, Eto Ryohei, Horiguchi-Babamoto Emi, Kobayashi Takashi, Naito Hiroyoshi, Shiro Motoo, Takahashi Hiromi, Matsumoto Shinya
Bulletin of the Chemical Society of Japan   88(5) 716-721   2015   [Refereed]
Takagi Kenichiro, Nagase Takashi, Kobayashi Takashi, Kushida Takashi, Naito Hiroyoshi
Japanese Journal of Applied Physics   54(1)    2015   [Refereed]
Takagi Kenichiro, Abe Soichiro, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Journal of Materials Science-Materials in Electronics   26(7) 4463-4474   2015   [Refereed]
Kobayashi Takashi, Shinke Wataru, Nagase Takashi, Murakami Shuichi, Naito Hiroyoshi
Thin Solid Films   554 106-109   2014   [Refereed]
Niwa Akitsugu, Kobayashi Takashi, Nagase Takashi, Goushi Kenichi, Adachi Chihaya, Naito Hiroyoshi
Applied Physics Letters   104(21)    2014   [Refereed]
Hase Hiroyuki, Okachi Takayuki, Ishihara Shingo, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Thin Solid Films   554 218-221   2014   [Refereed]
Takagi Kenichiro, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Organic Electronics   15(2) 372-377   2014   [Refereed]
Takagi Kenichiro, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Japanese Journal of Applied Physics   53(5)    2014   [Refereed]
Takata Masashi, Kouda Naoya, Ishihara Shingo, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Japanese Journal of Applied Physics   53(2)    2014   [Refereed]
Ishihara Shingo, Hase Hiroyuki, Okachi Takayuki, Naito Hiroyoshi
Thin Solid Films   554 213-217   2014   [Refereed]
Terada Yosuke, Kobayashi Takashi, Nakatsuka Emi, Nagase Takashi, Naito Hiroyoshi
Thin Solid Films   554 209-212   2014   [Refereed]
Kushida Takashi, Nagase Takashi, Naito Hiroyoshi
Applied Physics Letters   104(9)    2014   [Refereed]
Yanagida Masatoshi, Numata Youhei, Yoshimatsu Keiichi, Ochiai Masayuki, Naito Hiroyoshi, Han Liyuan
Electrochimica Acta   87 309-316   2013   [Refereed]
Shimakawa K, Itoh T, Naito H, Kasap S. O.
Applied Physics Letters   102(9)    2013   [Refereed]
Endo Toshiyuki, Nagase Takashi, Kobayashi Takashi, Naito Hiroyoshi
Japanese Journal of Applied Physics   52(12)    2013   [Refereed]
Kimihiro Matsukawa, Mitsuru Watanabe, Takashi Hamada, Takashi Nagase, Hiroyoshi Naito
International Journal of Polymer Science   2012    Dec 2012
Printable organic thin-film transistor (O-TFT) is one of the most recognized technical issues nowadays. Our recent progress on the formation of organic-inorganic hybrid thin films consists of polymethylsilsesquioxane (PMSQ), and its applications f...
K. Shimakawa, T. Itoh, H. Naito, S. O. Kasap
Physica Status Solidi (C) Current Topics in Solid State Physics   9 2602-2605   Dec 2012
It is shown that a series sequence of transport involving grains and grain boundaries produces non-Drude THz conductivity in nanomaterials. The present model represents a different point of view than the well accepted Drude-Smith model. In this pa...
Hiroyoshi Naito, Setsuhisa Tanabe
Physica Status Solidi (C) Current Topics in Solid State Physics   9 2222-2225   Dec 2012
Shingo Ishihara, Hiroyuki Hase, Takayuki Okachi, Hiroyoshi Naito
Physica Status Solidi (C) Current Topics in Solid State Physics   9 2561-2564   Dec 2012
Determination of hole drift mobility of 4,4'-bis[N-(1-naphthyl)-N-phenyl-amino]-biphenyl (NPB)/ tris(8-hydroxy-quinolinato) aluminium (Alq3) double-layer diodes has been examined from the simulation of impedance spectra. The theoretical basis for ...
Akira Ohta, Kazuki Hattori, Takashi Kobayashi, Hiroyoshi Naito, Takeshi Kawase, Chitoshi Kitamura
Acta Crystallographica Section E: Structure Reports Online   68    Oct 2012
The title compound, C16H12O4, crystallizes with two half-molecules in the asymmetric unit, each of which is completed by a crystallographic inversion center. The two crystal-lographically independent molecules have almost the same geometry and are...
Akira Ohta, Kazuki Hattori, Takeshi Kawase, Takashi Kobayashi, Hiroyoshi Naito, Chitoshi Kitamura
Acta Crystallographica Section E: Structure Reports Online   68    Aug 2012
Mol-ecules of the title compound, C18H16O6, are almost planar [maximum deviation = 0.096 (4) Å] and reside on crystallographic centres of inversion. They adopt a conformation in which the Cmeth-yl-O bonds are directed along the mol-ecular short ax...
Akira Ohta, Kazuki Hattori, Yui Kusumoto, Takeshi Kawase, Takashi Kobayashi, Hiroyoshi Naito, Chitoshi Kitamura
Chemistry Letters   41 674-676   Jul 2012
2,3,6,7-Tetrapropoxy-and 2,6-dipropoxy-substituted 9,10-anthraquinone (AQ) and anthracene (ANT) derivatives were synthesized, and their optical properties in solution and in the solid state were investigated. In AQs, the tetrapropoxy derivative ex...
K. Shimakawa, T. Itoh, H. Naito, S. O. Kasap
Applied Physics Letters   100    Jun 2012
K. Shimakawa, T. Itoh, H. Naito, S. O. Kasap
Applied Physics Letters   100    Mar 2012
The Drude-Smith (DS) model hitherto has been a well accepted model for the terahertz conductivity of nanomaterials, even though its physical basis is not clear. It is shown that a series sequence of transport involving grains and grain boundaries ...
Chitoshi Kitamura, Yusuke Tanigawa, Takashi Kobayashi, Hiroyoshi Naito, Hiroyuki Kurata, Takeshi Kawase
Tetrahedron   68 1688-1694   Feb 2012
Six 17,17-dialkyltetrabenzo[a,c,g,i]fluorenes (dialkylTBFs) 2-7 (methyl to n-hexyl) were prepared by treatment of 17H-tetrabenzo[a,c,g,i]fluorene (TBF) 1 with n-alkyl halides under basic conditions in moderate yields upon column chromatography and...
Kobayashi Takashi, Endo Toshiyuki, Nagase Takashi, Murakami Shuichi, Naito Hiroyoshi
Journal of Non-Crystalline Solids   358(17) 2530-2533   2012   [Refereed]
Matsumoto Shinya, Horiguchi-Babamoto Emi, Eto Ryohei, Sato Saori, Kobayashi Takashi, Naito Hiroyoshi, Shiro Motoo, Takahashi Hiromi
Dyes and Pigments   95(2) 431-435   2012   [Refereed]
Shimakawa K, Itoh T, Naito H, Kasap S. O.
Journal of Non-Crystalline Solids   358(17) 2373-2376   2012   [Refereed]
Takashi Kobayashi, Yosuke Terada, Takashi Nagase, Hiroyoshi Naito
Applied Physics Express   4    Dec 2011
Continuous-wave photoinduced absorption spectroscopy is applied to a bulk-heterojunction solar cell based on a blend of polymer and fullerene for the determination of carrier lifetime. This technique has several advantages with respect to conventi...
Chitoshi Kitamura, Hiroyuki Kano, Takeshi Kawase, Takashi Kobayashi, Hiroyoshi Naito
Acta Crystallographica Section E: Structure Reports Online   67    Oct 2011
The mol-ecule of the title compound, C 28H 32, is located on a crystallographic inversion center. The ethyl groups are essentially coplanar with the tetra-cene ring, making a torsion angle of -0.4 (4)°. The isopropyl groups adopt an asymmetric con...
Hideyuki Hatta, Takashi Nagase, Takashi Kobayashi, Mitsuru Watanabe, Kimihiro Matsukawa, Shuichi Murakami, Hiroyoshi Naito
IEICE Transactions on Electronics   E94-C 1727-1732   Jan 2011
Solution-based organic field-effect transistors (OFETs) with low parasitic capacitance have been fabricated using a self-aligned method. The self-aligned processes using a cross-linking polymer gate insulator allow fabricating electrically stable ...
Takashi Kushida, Takashi Nagase, Hiroyoshi Naito
Organic Electronics   12 2140-2143   Jan 2011
A roll-transfer printing method has been proposed for the uniaxial alignment of the liquid crystalline polymer semiconductor of poly(3,3″′-didodecylquarterthiophene) (PQT). It is shown that the roll-transfer printing of PQT at its liquid crystal p...
Kouhei Nishida, Masaki Oka, Hiroyuki Hase, Hiroyoshi Naito
IEEJ Transactions on Electronics, Information and Systems   131 283-289   Jan 2011
Organic solar cells have several potential advantages compared with conventional inorganic solar cells, including light weight, flexibility, and low cost fabrication of large areas by using printing techniques. A representative organic solar cell ...
Kitamura Chitoshi, Ohara Takuya, Yoneda Akio, Kawase Takeshi, Kobayashi Takashi, Naito Hiroyoshi
Chemistry Letters   40(1) 58-59   2011   [Refereed]
Kitamura Chitoshi, Kano Hiroyuki, Tsukuda Hideki, Kawase Takeshi, Kobayashi Takashi, Naito Hiroyoshi
Heterocycles   83(7) 1621-1629   2011   [Refereed]
Kobayashi Takashi, Endo Toshiyuki, Ikame Satoshi, Nagase Takashi, Murakami Shuichi, Naito Hiroyoshi
Journal of the Physical Society of Japan   80(3)    2011   [Refereed]
Kitamura Chitoshi, Takenaka Akira, Kawase Takeshi, Kobayashi Takashi, Naito Hiroyoshi
Chemical Communications   47(23) 6653-6655   2011   [Refereed]
Kobayashi Takashi, Endo Toshiyuki, Shinke Wataru, Nagase Takashi, Murakami Shuichi, Naito Hiroyoshi
Japanese Journal of Applied Physics   50(7)    2011   [Refereed]
Ishihara Shingo, Hase Hiroyuki, Okachi Takayuki, Naito Hiroyoshi
Organic Electronics   12(8) 1364-1369   2011   [Refereed]
Kobayashi Takashi, Kinoshita Keita, Nagase Takashi, Naito Hiroyoshi
Physical Review B   83(3)    2011   [Refereed]
Ishihara Shingo, Hase Hiroyuki, Okachi Takayuki, Naito Hiroyoshi
Journal of Applied Physics   110(3)    2011   [Refereed]
Kushida Takashi, Nagase Takashi, Naito Hiroyoshi
Applied Physics Letters   98(6)    2011   [Refereed]
Keita Kinoshita, Takashi Kobayashi, Takashi Nagase, Hiroyoshi Naito
Materials Science Forum   658 503-506   Dec 2010
We investigate the dynamics of charged states (polarons) in bulk heterostructures of polythiophene and fullerene derivatives by means of photoinduced absorption spectroscopy, and is compared them with those in pristine polythiophene thin films. Po...
Chitoshi Kitamura, Hideki Tsukuda, Takeshi Kawase, Takashi Kobayashi, Hiroyoshi Naito
X-ray Structure Analysis Online   26 65-66   Jan 2010
The structure of 1,4,5,8-tetrapentylanthracene was determined by X-ray crystallography. The compound crystallizes in a triclinic system and was characterized thus: P1, a = 5.350(4), b = 9.580(7), c = 14.946(10)Å, α = 99.685(9), β = 90.243(11), γ =...
Kitamura Chitoshi, Matsumoto Chika, Yoneda Akio, Kobayashi Takashi, Naito Hiroyoshi, Komatsu Toshiki
European Journal of Organic Chemistry   (13) 2571-2575   2010   [Refereed]
Kitamura Chitoshi, Abe Yasushi, Ohara Takuya, Yoneda Akio, Kawase Takeshi, Kobayashi Takashi, Naito Hiroyoshi, Komatsu Toshiki
Chemistry-a European Journal   16(3) 890-898   2010   [Refereed]
Endo Toshiyuki, Nagase Takashi, Kobayashi Takashi, Takimiya Kazuo, Ikeda Masaaki, Naito Hiroyoshi
Applied Physics Express   3(12)    2010   [Refereed]
Nagase Takashi, Hamada Takashi, Tomatsu Kenji, Yamazaki Saori, Kobayashi Takashi, Murakami Shuichi, Matsukawa Kimihiro, Naito Hiroyoshi
Advanced Materials   22(42) 4706-+   2010   [Refereed]
Kushida Takashi, Nagase Takashi, Naito Hiroyoshi
Organic Electronics   11(7) 1323-1326   2010   [Refereed]
Endo Toshiyuki, Ikame Satoshi, Kobayashi Takashi, Nagase Takashi, Murakami Shuichi, Naito Hiroyoshi
Physical Review B   81(7)    2010   [Refereed]

Misc

 
Masaru Inoue, Noriaki Oyabu, Yo Kumoda, Yu Suenaga, Tomoya Ishii, Hiroyoshi Naito
AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings      Jul 2019
© 2019 FTFMD. We have demonstrated the measurement of the concentration of ion impurities in organic photovoltaic (OPV) materials by using a transient current measurement method that has been developed for the screening and the optimization of thi...
Takashi Nagase, Kenichiro Takagi, Ryosuke Nakamichi, Takashi Kobayashi, Hiroyoshi Naito
23rd International Display Workshops in conjunction with Asia Display, IDW/AD 2016   4 2107-2110   Jan 2018
copyright © 2016 Society of Information Display. All rights reserved. We report that the use of top-gate configuration for OTFTs based on solution-processable organic semiconductors allows enhancing field-effect mobility as well as operational sta...
Fumiya Shiono, Takashi Nagase, Takashi Kobayashi, Hiroyoshi Naito
23rd International Display Workshops in conjunction with Asia Display, IDW/AD 2016   4 2167-2168   Jan 2018
copyright © 2016 Society of Information Display. All rights reserved. We have developed organic floating-gate transistor memories comprising solution-processed organic films. A top-gate configuration is employed and all organic films are deposited...
Makoto Takada, Hiroyoshi Naito
New Polymeric Materials Based on Element-Blocks   413-422   Jan 2018
© Springer Nature Singapore Pte Ltd. 2019. Air-stable organic light-emitting diodes (OLEDs) and organic photovoltaic cells (OPVs) are fabricated by using metal oxide instead of low-work function metals such as Ca as a cathode. The optoelectronic d...
Hayato Abe, Takashi Nagase, Takashi Kobayashr, Hiroyoshi Naito
Proceedings of the International Display Workshops   1 403-404   Jan 2018
© 2018 International Display Workshops. All rights reserved. We report the enhancement of the performance of solution-processable organic transistor memories with organic floating gates. Organic transistor memories with polymer. TIPS-pentacene ble...
Hiroyoshi Naito, Yu Suenaga, Takashi Nagase, Takashi Kobayashr
Proceedings of the International Display Workshops   1 253-256   Jan 2018
© 2018 International Display Workshops. All rights reserved. Complex impedance of an equivalent circuit of organic field-effect transistors (OFETs) taking account of electrode overlap between source/drain and gate electrodes has been derived. Expe...
Fumiya Shiono, Takashi Nagase, Takashi Kobayashi, Hiroyoshi Naito
Proceedings of the International Display Workshops   2 1575-1576   Jan 2017
© 2017 Proceedings of the International Display Workshops. All rights reserved. We fabricated nonvolatile molecular floating-gate transistor memories by solution process and investigated their memory characteristics under light illumination. Solut...
Shova Sanda, Takashi Nagase, Takashi Kobayashi, Kazuo Takimiya, Yuichi Sadamitsu, Hiroyohi Naito
Proceedings of the International Display Workshops   1 371-374   Jan 2017
© 2017 Proceedings of the International Display Workshops. All rights reserved. We report the effect of organic solvents for spin coating dialkyl BTBT on the mobility of top-gate organic FETs. Top-gate Ca-BTBT and C12-BTBT FETs processed using non...
Takashi Nagase, Kenichiro Takagi, Ryosuke Nakamichi, Takashi Kobayashi, Hiroyoshi Naito
23rd International Display Workshops in conjunction with Asia Display, IDW/AD 2016   1 441-444   Jan 2016
© 2016 Society for Information Display. All rights reserved. We report that the use of top-gate configuration for OTFTs based on solution-processable organic semiconductors allows enhancing field-effect mobility as well as operational stability. T...
Takashi Kobayashi, Takashi Nagase, Hiroyoshi Naito
Springer Series in Materials Science   203 63-80   Jan 2015
© Springer Science+Business Media Singapore 2015. Polyfluorene is well known as an efficient blue emitter for polymer-based light-emitting diodes and is very attractive from a physical point of view because randomly twisted, regularly twisted, or ...
Rvosuke Nakamichi, Takashi Nagase, Takashi Kobayashi, Yuichi Sadamitsu, Hiroyoshi Naito
Proceedings of the International Display Workshops   3 1787-1788   Jan 2015
© 2015 Proceedings of the International Display Workshops. All rights reserved. We have developed a simple method to control and improve the electrical characteristics of solution-processable OTFTs based on dialkylbenzothienobenzothiophenes by usi...
Ryosuke Nakamichi, Takashi Nagase, Takashi Kobayashi, Yuichi Sadamitsu, Hiroyoshi Naito
Proceedings of the International Display Workshops   1 319-320   Jan 2015
© 2015 Society for Information Display. We have developed a simple method to control and improve the electrical characteristics of solution-processable OTFTs based on dialkylbenzothienobenzothiophenes by using mixed organic solvents. Top-gate OTFT...
Junya Hasegawa, Makoto Takada, Takashi Nagase, Takashi Kobayashi, Hiroyoshi Naito
Proceedings of the International Display Workshops   2 1047-1050   Jan 2015
© Proceedings of the International Display Workshops. All rights reserved. We characterized multi-layer inverted organic light emitting diodes (iOLEDs) fabricated by a spin coating method. The device showed the highest brightness of 15,500 cd m2 a...
Ryosuke Nakamichi, Takashi Nagase, Takashi Kobayashi, Yuichi Sadamitsu, Hiroyoshi Naito
21st International Display Workshops 2014, IDW 2014   1 706-709   Jan 2014
© 2014 ITE and SID. We have fabricated short-channel organic FETs with top-gate configurations by conventional spin-coating processes. The solution-processed organic FETs with a channel length of 5 pm exhibit high field-effect mobilities of 1 cm2V...
Jun Okada, Takashi Nagase, Takashi Kobayashi, Hiroyoshi Naito
21st International Display Workshops 2014, IDW 2014   1 312-313   Jan 2014
© 2014 ITE and SID. Solution-processed organic passivation layers for amorphous InZnO thin-film transistors (TFTs) have been shown. Solution-processed amorphous InZnO TFTs with the organic passivation layers exhibit good electrical stability of th...
Yu Kimura, Takashi Nagase, Takashi Kobayashi, Kazuo Takimiya, Masaaki Ikeda, Hiroyoshi Naito
Proceedings of the International Display Workshops   1 443-446   Jan 2013
© 2013 ITE and SID. Low voltage operation of organic field-effect transistors (OFETs) with embedded source/drain electrodes has been demonstrated. Soluble small molecules of 2,7-dioctyl [1]benzothieno[3,2-b][1] benzothiophene and CYTOP were used a...
Yu Kimura, Fumio Mochizuki, Takashi Nagase, Takashi Kobayashi, Kazuo Takimiya, Masaaki Ikeda, Hiroyoshi Naito
Proceedings of the International Display Workshops   1 401-404   Dec 2012
We have fabricated 2, 7-dioctyl[1]benzothieno [3, 2-b][1]benzothiophene (C8-BTBT)-based topgate organic FETs with embedded source-drain electrodes and investigated the effect of the planarization of C8-BTBT layers. Top-gate C8-BTBT FETS with embed...
Fumio Mochizuki, Yosuke Miyata, Takashi Nagase, Takashi Kobayashi, Kazuo Takimiya, Masaaki Ikeda, Hiroyoshi Naito
Proceedings of the International Display Workshops   2 1022-1025   Dec 2012
Effect of MoO3 hole-injection layers on the electrical characteristics of top-gate Ce-BTBT OFETs has been investigated. The field-effect mobility of short-channel devices is improved by inserting 1-nm-thick M0O3 layers, as a result of the decrease...
Kenichiro Takagi, Takashi Nagase, Takashi Kobayashi, Hiroyoshi Naito
Proceedings of the International Display Workshops   1 405-408   Dec 2012
Charge transport in top-gate OTFTs using solution-processable polycrystalline and amorphous semiconductors with different polymer gate insulators is investigated. Unlike amorphous OTFTs, polycrystalline OTFTs exhibit high field-effect mobility irr...
Fumio Mochizuki, Toshiyuki Endo, Takashi Nagase, Takashi Kobayashi, Kazuo Takimiya, Masaaki Ikeda, Hiroyoshi Naito
Proceedings of the International Display Workshops   1 85-88   Dec 2011
We have fabricated 2,7-dioctyl[1]benzothieno [3,2-b][1]benzothiophene (C8-BTBT)-based organic field-effect transistors (OFETs) with top-gate configurations having fluoropolymer gate insulators by spin-coating processes. Top-gate OFETs with spin-co...
Takashi Nagase, Kenichiro Takagi, Takashi Kobayashi, Takashi Kushida, Hiroyoshi Naito
Proceedings of the International Display Workshops   1 125-128   Dec 2011
We have investigated charge transport in poly(3-hexylthiophene) (P3HT)-based OFETs using top-gate, bottom-gate, and double-gate configurations. Top-gate P3HT OFETs exhibit high field-effect mobilities, which are almost independent of the type of g...
M. Oka, Y. Iwata, H. Naito, M. Inoue, H. Ichinose, M. Klasen-Memmer, K. Tarumi
Proceedings of the International Display Workshops   3 1553-1556   Dec 2011
We have measured the Leslie viscosity coefficients and dielectric anisotropy by fitting the analytical expressions for transient current to the experimental data using a newly developed algorithm. This algorithm is based on a genetic algorithm, Le...
Takashi Kushida, Takashi Nagase, Hiroyoshi Naito
Materials Research Society Symposium Proceedings   1360 18-23   Dec 2011
Air-mediated molecular ordering in self-organized polymer semiconductors of regioregular poly(3-hexylthiophene) (P3HT) and poly[(9,9′- dioctylfluorenyI-2,7-diyl)-(2,2′-bithiophene-5,5′-diyl)] (F8T2) was investigated using organic field-effect tran...
T. Endo, T. Nagase, T. Kobayashi, K. Takimiya, M. Ikeda, H. Naito
IDW'10 - Proceedings of the 17th International Display Workshops   3 2235-2238   Dec 2010
A simple, low-temperature, and reproducible fabrication process of dioctylbenzothienobenzothiophene top-gate field-effect transistors has been reported. A total of 116 devices exhibit high mobilities of 1.59±0.40 cm2/Vs, low threshold voltages of ...
M. Oka, K. Iwaya, Y. Iwata, H. Naito, M. Inoue, H. Ichinose, M. Klasen-Memmer, K. Tarumi
IDW'10 - Proceedings of the 17th International Display Workshops   1 127-130   Dec 2010
We have derived the analytical expressions of the transient current in homeotropic nematic liquid crystal (NLC) cells and have determined the Leslie viscosity coefficients by fitting the analytical expressions for transient current to the experime...
Kimihiro Matsukawa, Saori Yamazaki, Sakae Tokai, Masashi Yoshikawa, Takashi Nagase, Takashi Kobayashi, Yoshiki Michiwaki, Seiji Watase, Mitsuru Watanabe, Hiroyoshi Naito
IDW'10 - Proceedings of the 17th International Display Workshops   2 869-872   Dec 2010
It is essential to control the wettability of soluble organic semiconductors on gate dielectrics for organic field-effect transistors using solution processes. We found that the addition of a small amount of silica nanoparticles (SNPs) drastically...
Hirovoshi Naito, Takashi Nagase, Masashi Yoshikawa, Takashi Kobayashi, Yoshiki Michiwaki, Kimihiro Matsukawa
IDW'10 - Proceedings of the 17th International Display Workshops   2 1693-1696   Dec 2010
A hybrid gate insulator of poly(methyl silsesquioxane) (PMSQ) exhibits excellent insulating properties, low curing temperature of 150 °C and low surface energy. Hybrid semiconductors, silica nanoparticles (SNPs) added organic semiconductors exhibi...
Takashi Nagase, Hideyuki Hatta, Yuhi Miyagawa, Takashi Kobayashi, Shuichi Murakami, Mitsuru Watanabe, Kimihiro Matsukawa, Hiroyoshi Naito
IDW'10 - Proceedings of the 17th International Display Workshops   2 739-742   Dec 2010
We have fabricated the solution-based organic FETs with polymer gate insulators using a self-aligned method and investigated their frequency characteristics. The fabricated organic FETs exhibit electrically stable operation and have extremely low ...
K. Iwava, H. Naito, H. Ichinose, M. Klasen-Memmer, K. Tarumi
IDW'10 - Proceedings of the 17th International Display Workshops   1 119-122   Dec 2010
We have proposed a method for determining simultaneously elastic constants and anchoring energy of nematic liquid crystal (NLC) cells by measuring capacitance (C)- voltage (V) characteristics of NLC cells. This method is based on the numerical cal...
K. Iwava, H. Naito, H. Ichinose, M. Klasen-Memmer, K. Tarumi
IDW '09 - Proceedings of the 16th International Display Workshops   1 229-232   Dec 2009
A method for the simultaneous determination of anchoring energy and elastic constants of nematic liquid crystals (NLCs) by measuring capacitance (C) of NLC cells as a function of voltage (V) is proposed. The applicability of the present method has...
H. Hase, T. Okachi, T. Nagase, T. Kobayashi, H. Naito
IDW '09 - Proceedings of the 16th International Display Workshops   2 1069-1072   Dec 2009
We propose a method for the determination of localized-state distributions in organic light-emitting diodes by impedance spectroscopy. The applicability of the method is demonstrated in poly(9,9-dioctyl-fluorene-co-N-(4-butylphenyl)- diphe nylamin...
Takashi Nagase, Takeshi Hirose, Shuhei Nishigami, Takashi Kobayashi, Rieko Ueda, Akira Otomo, Hiroyoshi Naito
IDW '09 - Proceedings of the 16th International Display Workshops   3 1785-1788   Dec 2009
We investigate the device characteristics of organic field-effect transistors (OFETs) with nanometer scaled channels. It is found that short-channel effects in OFETs strongly depend on the organic semiconductor/electrode interface and the electric...
Shingo Lshihara, Takayuki Okachi, Hiroyoshi Naito
IDW '09 - Proceedings of the 16th International Display Workshops   2 1085-1088   Dec 2009
The hole mobilities of tris(8-hydroxyquinoIine) aluminum (AIq3) thin films and 4,4'-his[N-(l-naphthyl)-N-phenyl-amino]-biphenyl (NPB) /AIq 3 multilayer thin films have been determined using impedance spectroscopy (IS) measurements. We employed the...
Y. Iwata, H. Naito, M. Inoue, H. Ichinose, M. Klasen-Memmer, K. Tarumi
IDW '08 - Proceedings of the 15th International Display Workshops   2 515-518   Dec 2008
A method for determining the Leslie viscosity coefficients of nematic liquid crystals (NLCs) with negative dielectric anisotropy (Δε < 0) is proposed. It has been shown that the transient current, induced by step voltage excitation, in homeotropic...
T. Okachi, T. Nagase, T. Kobayashi, H. Naito
IDW '08 - Proceedings of the 15th International Display Workshops   2 1021-1024   Dec 2008
A theory of the method for determining localized-state distributions in organic light-emitting diodes by impedance spectroscopy is proposed and the applicability of the method is examined by computer simulation. Analytical expressions relating imp...
Y. Terao, K. Kawaguchi, M. Nishiura, H. Kimura, T. Saito, M. Ichikawa, T. Okachi, H. Naito
IDW '08 - Proceedings of the 15th International Display Workshops   2 979-982   Dec 2008
Impedance spectroscopy measurements were carried out on the multilayer OLEDs. Low-efficient OLEDs show large magnitude of negative capacitance (NC). NC may well be connected to loss mechanisms of luminous efficiency and the performance degradation...
T. Hamada, S. Yamazaki, T. Nagase, K. Tomatsu, Y. Ueda, M. Watanabe, S. Watase, T. Tamai, T. Kobayashi, S. Murakami, H. Naito, K. Matsukawa
IDW '08 - Proceedings of the 15th International Display Workshops   3 1665-1668   Dec 2008
We have developed polymethylsilsesquioxane (PMSQ)-type gate insulating thin films with good high resistivity and surface morphology. In addition, novel functional polysilsesquioxane gate insulator materials have been developed, which have a high-d...
Y. Iwata, H. Naito, M. Inoue, H. Ichinose, M. Klasen-Memmer, K. Tarumi
IDW '07 - Proceedings of the 14th International Display Workshops   1 43-46   Dec 2007
Flow effects on the dynamic behavior of the director in homogeneous nematic liquid crystal (NLC) cells with positive dielectric anisotropy (Δε>0) and homeotropic NLC cells with negative dielectric anisotropy (Δε<0) have been studied from the analy...
T. Okachi, T. Nagase, T. Kobavashi, H. Naito
IDW '07 - Proceedings of the 14th International Display Workshops   2 1129-1132   Dec 2007
A new method has been proposed for the determination of charge-carrier mobility in organic light-emitting diodes (OLEDs) by impedance spectroscopy (IS) measurements. The theoretical basis of this method is a single-injection space-charge-limited c...
T. Hamada, K. Tomatsu, T. Nagase, T. Kobayashi, S. Murakami, M. Watanabe, H. Naito, K. Matsukawa
IDW '07 - Proceedings of the 14th International Display Workshops   2 599-600   Dec 2007
Silsesquioxane materials were prepared by a sol-gel method, which have many advantages such as low cost, solution processability, and so on. We have investigated polymethylsilsesquioxane (PMSQ)-type gate insulating thin films with good high resist...
T. Okachi, H. Azuma, T. Nagase, T. Kobayashi, H. Naito
IDW '06 - Proceedings of the 13th International Display Workshops   2 1323-1326   Dec 2006
Impedance spectroscopy (IS) of poly(9,9-dioctylfluorene) (F8) polymer light-emitting diodes (PLEDs) with anode buffer layers has been studied to determine their equivalent circuits. The equivalent circuits of the PLEDs below and above the threshol...
Y. Sasaki, H. Ichinose, H. Naito
IDW '06 - Proceedings of the 13th International Display Workshops   1 219-222   Dec 2006
A new saturation voltage method is proposed for determining the anchoring energy of nematic liquid crystals (NLCs) with negative dielectric anisotropy (Δε<0) in vertically aligned NLC cells by measuring capacitance of the NLC cells as a function o...
T. Kobayashi, H. Naito
Optical Properties of Condensed Matter and Applications   235-259   Nov 2006
Mitsumasa Iwamoto, Geoffrey R. Luckhurst, Hiroyoshi Naito, Zhong can Ou-Yang, Edward T. Samulski, Akihiko Sugimura
Thin Solid Films   509 1-2   Jun 2006
H. Azuma, T. Okachi, N. Watanabe, T. Kobayashi, H. Naito
IDW/AD'05 - Proceedings of the 12th International Display Workshops in Conjunction with Asia Display 2005   757-760   Dec 2005
Impedance spectroscopy (IS) measurements have been carried out on poly(9,9-dioctylfluorene) (F8) single layer polymer light emitting diodes (PLEDs) below and above the threshold voltage for electroluminescence (EL) in order to determine the equiva...
Melanie Klasen-Memmer, Kazuaki Tarumi, Hiroyoshi Naito, Hideo Ichinose
Proceedings of the Second Americas Display Engineering and Applications Conference, ADEAC 2005   158-160   Dec 2005
Liquid Crystal Displays (LCDs) using Vertical Alignment (VA) and In Plane Switching (IPS) modes are strongly entering the TV-market. However, from LC-material side of view the switching times still have to be drastically improved whereby the requi...
Kimihiro Matsukawa, Yukihito Matsuura, Masaki Chikaraishi, Hiroyoshi Naito
Polymer Preprints, Japan   54 529   Dec 2005
Polydihexylsilane (PDHS) has a thermochromism on the temperature dependent UV absorption spectra. A hybrid thin film of small amount PDHS and silica nanoparticles modified with phenyl groups exhibited the suppression of thermochromism, in which on...
Hiroyoshi Naito, Masahiro Marusaki, Masaki Chikaraishi, Yukihito Matsuura, Kimihiro Matsukawa
Polymer Preprints, Japan   54 4412-4413   Dec 2005
Optical properties of hybrid thin films, poly(di-n-hexylsilane) (PDHS) dispersed in a zirconia matrix prepared by a sol-gel method, have been studied by means of optical absorption, photoluminescence and ellipsometry measurements. It is found that...
Melanie Klasen-Memmer, Kazuaki Tarumi, Hiroyoshi Naito, Hideo Ichinose
SID Conference Record of the International Display Research Conference   2005 158-160   Dec 2005
Liquid Crystal Displays (LCDs) using Vertical Alignment (VA) and In Plane Switching (IPS) modes are strongly entering the TV-market. However, from LC-material side of view the switching times still have to be drastically improved whereby the requi...
Takaaki Dohmaru, K. Oka, T. Nakamura, H. Naito
International Conference on Digital Printing Technologies   544-547   Dec 1998
UV absorption spectra of poly(methylphenylsilane) films were measured at varying temperatures from 25°C to 200°C and a new thermal hysteresis in UV absorption of the polysilane films was observed. Once a polysilane film was annealed above its glas...
Masahiro Okuda, Hiroyoshi Naito, Tatsuhiko Matsushita
Proceedings of SPIE - The International Society for Optical Engineering   2053 81-86   Dec 1993
In stoichiometric GeTe-Sb2Te3films, reversible phase change optical recording materials, Sb addition is used widely in order to improve the crystallization speed, the data retention time, and the stability of cyclic operation, but its mechanism is...
Preparation and characterization of Pb-doped Bi-Sr-Ca-Cu-O superconductors
Bulletin of University of Osaka Prefecture   41,1    1992
Possible nanometer scale intelligent memories
Proc. 1st International Conference on Intelligent Materials   214    1992
Novel relation between thermodynamical and transport properties in glassy photoconductors
Proc. International Conference on Imaging Science and Hardcopy   53    1992
Mechanism of reversible phase change optical recording with Te alloy films
Proc. International Conference on Imaging Science and Hardcopy   385    1992
Modern Physics Letter   6(19) 1205-1207   1992
An STM study of microscopic function at the interface of organic films
Proc. 1st International Conference on Intelligent Materials   210    1992
Masato OHMUKAI, Hiroyoshi NAITO, Masahiro OKUDA, Kou KUROSAWA, Wataru SASAKI, Yasuo TAKIGAWA, Tatsuhiko MATSUSHITA, Yoshiaki TSUNAWAKI
The Review of Laser Engineering   20(12) 970-979   1992
Light-induced States in a-As2Se3 : comparison with a-Si : H
Journal of Non-Crystalline Solids   164-166,207    1993
Silicon precipitation induced by Argon excimer laser in surface layers of Si3N4
Japanese Journal of Applied Physics   32(8A) L1062   1993
Jinli DING, Hiroyoshi NAITO, Masahiro OKUDA, Takaaki DOHMARU
DENSHI SHASHIN GAKKAISHI (Electrophotography)   33(2) 135-141   1994
Japanese Journal of Applied Physics   33(1B) L119-L121   1994
Self-Repair of Photo-Created Dangling Bonds in Organic Polysilanes
EXTENDED ABSTRACTS of THE 3RD ASIA-PACIFIC WORKSHOP ON INTELLIGENT MATERIALS   22   1995
Transient Hole Transport in a-(As2Se3) : Te Thin Films
Bulletin of University of Osaka Prefecture   43(2) 95   1994
A Simple Interpretation of Transient Charge Transport Induced by Iodine Doping in Amorphous Arsenic Triselenide
Bulletin of University of Osaka Prefecture   43(2) 101   1994
Measurement of Rotational Viscosity and Pretitle Angle in Nematics from Transient Current
Molecular Crystals and Liquid Crystals   262 267   1995
Photocurrent in a Nematic Liquid Crystals
Molecular Crystals and Liquid Crystals   263 491   1995
A New Method for the Determination of Localized-State Distribution in Amorphous Semiconductors from Transient Photoconductivity
Proceeding of 2nd International Conference on "Imaging Science and Hardcopy"(Guilin, China, May14-19, 1995)   59   1995
Negative Differential Resistance as an Intelligent Function Observed with Scanning Tunneling Spectroscopy in Organic Films Evaporated on Inorganic Substrates
Proceeding of International Conference on Advanced Materials,(Tokyo, Aug. 31-Sept. 4, 1993)   663   1993
Determination of Localized-State Distributions from Transient Photo-conductivity Data
Solid State Phenomena   44-46 647   1995
Effect of molecular weight on hole transport in polysilanes
Proceedings of International Conference on Digital Printing Technologies'96   471   1996
Shuichi Murakami, Hiroyoshi Naito
Japanese Journal of Applied Physics   36(4A) 2222-2225   1997
Transient photoconductivity study of licalized state distributions in highly resistive semiconductor thin films
Proceedings of 9th International School on Condensed Matter Physics   96   1997
Numerical simulation of director distribution in mematic liquid crystal cells with weak anchoring boundaries
Molecular Crystals and Liquid Crystals   301 79   1997
Temperature dependence of nematic ancoring energy on weak surfaces of polyimide Langmuir-Blodgett films
Molecular Crystals and Liquid Crystals   304 253   1997
Hironori Iga, Hiroyoshi Naito
Japanese Journal of Applied Physics   36(8) 5179-5180   1997
Photoelectric properties of organic polyoilune containing anthracene units in the polymer backbone
IEICE Trans. Electron.   E81-C 1090-1097   1998
Room temperature ultravidet electroluminescence from poly(methylphenyl-silane)
Chemistry Letters   299-300   1999
Corrier transport properties in polysilanes with various molecular weights
J. Imaging Science and Technology   4 371-376   1998
Observation of light scattering induced by ionic conduction in nematic liquid crystal cells
Mol. Cryst. Liq. Cryst.   331 289-296   1999
Visible photoluminescence and electronic transport in organic polysilanes containing anthracene units (共著)
Proceedings of 10th International School on Condensed Matter Physics (World Scientific Publishing, Singapore)   67-75   1999
Photoinduced charge transfer and bipolar transport in polymethylphenylsilane thin films containing diphenoquinone
Extended Abstracts of Nano-molecular Electronics Meeting '99   0-02   1999
Observation of transient diffraction induced by ionic conduction in nematic liquid crystal cells (共著)
Proceedings of 1999 IEEE 13th International Conference on Dielectric Liquids (ICDL '99).   575-578   1999
Deformation of smectic-A domains in an isotropic phase induced by electric-field application (共著)
AIP Conference Proceedings   519 202-204   2000
Equilibrium Shape of a Smectic-A Phase in an Isotropic Phase Formed on Substrate Surface
Mol. Cryst. Liq. Cryst.   347 137-146   2000
Shinya Mimura, Hiroyoshi Naito, Takaaki Dohmaru, Mikio Aramata
Jpn. J. Appl. Phys   39(11) 6364-6365   2000
Optical properties of organic polysilanes-silica composites.
Extended abstracts of Japan-Korean Joint Symposium on Imaging Materials and Technologies(Nov. 30-Dec. 2, 2000, Osaka)   37-40   2000
Energy Transfer in(Organic Polysilane)-(Silica Matrix)Hybrid Thin Films
Exended abstracts of 4th International Conference on Nano-molecular Electronics(Dec. 5-7, 2000, Kobe)   63-64   2000
Excitation energy migration in molecularly doped polymers
Proceedings of the Korea-Japan Joint Symposium on Imaging Materials and Technology 2001 (Kyongju, Korea, 2001)   61-64    2001
Optical properties and photoinduced phenomena in (organic polysilane)-(silica) hybrid thin films
KIEE International Transactions of EA   12C-2, 87-90    2002
Experimental and theoretical studies of transient current of nematic liquid crystals with negative dielectric anisotropy excited by step voltage application
proceedings of the 11th international display workshops (idw 2004)   pp. 223-226.    2004
Jpn. J. Appl. Phys.   44, L915-L917    2005
Transient and steady-state photocurrent in an emissive layer of green electrophosphorescent devices
N. Matsusue, S. Ikame, Y. Suzuki, and H. Naito
IEICE Trans. Electronics   E87 2033-2038   2005
T. Kobayashi, S. Matsumoto, T. Aoyama, and T. Wada
Thin Solid Films   509 145-148   2006

Books etc

 
Observation of Smectic-A Helical Filaments in an Isotropic Phase
Proceedings of the International Conference on Pattern Formation and Self-organization in Nonlinear Complex Systems (Beijing 2001)   2001   
Optical properties of organic polysilane embedded in a silica matrix
Proceedings of 25th Int. Conf. Phys. Semicond. (Osaka 2000)   2001   
Optical properties and photoinduced phenomena in (organic polysilane)-(silica) hybrid thin films
Extended Abstracts of the 1st International Discussion and Conference on Nano Interface Controlled Electronic Devices (Kyongju, Korea, 2001)   2001   
Influence of photo-oxidation on optical properties of poly(9,9-dioctylfluorene)
Exended abstracts of Japan-Korea Joint Symposium on Imaging Materials and Technology 2002 (Nov. 25 - 27, 2002, Yokohama)   2002   
Photocarrier generation at nano-interfaces in (organic polysilane)-(titania matrix) hybrid thin films
Extended Abstract of The 5th International Conference on Nano-Molecular Electronics (Kobe, Dec. 10-12, 2002)   2002   

Works

 
Study on characterization of liquid crystal display devices
2000
Analysis of charge carrier transport mechanisms in polymeric emissive materials
2001
Pattern formation of smectic-A liquid crystals
2001

Research Grants & Projects

 
Study on Photoinduced phenomena in Organic Semiconductors
Public/Private Cooperative Joint Researches
Study on Photoelectronic Properties and their Characterization of organic semiconductors
Grant-in-Aid for Scientific Research
Study on Pattern Formation of Liquid crystals and Biomembranes
Grant-in-Aid for Scientific Research
Improvement external quantum efficiency of organic light emitting diodes
Public/Private Cooperative Joint Researches
Device physics of organic field effect transistors
Project Year: 2004   
Device physics of organic solar cells
Project Year: 2009   

Patents

 
長谷川 靖哉, 名取 詩織, 中西 貴之, 北川 裕一, 伏見 公志, 赤木 努, 内藤 裕義, 福留 淳
平本 昌宏, 菊地 満, 新村 祐介, 廣田 真樹, 内藤 裕義, 阿部 正宏, 貞光 雄一