論文

査読有り
2015年12月

Thickness and Substrate Dependent Thin Film Growth of Picene and Impact on the Electronic Structure

JOURNAL OF PHYSICAL CHEMISTRY C
  • Takuya Hosokai
  • ,
  • Alexander Hinderhofer
  • ,
  • Fabio Bussolotti
  • ,
  • Keiichirou Yonezawa
  • ,
  • Christopher Lorch
  • ,
  • Alexei Vorobiev
  • ,
  • Yuri Hasegawa
  • ,
  • Yoichi Yamada
  • ,
  • Yoshihiro Kubozoro
  • ,
  • Alexander Gerlach
  • ,
  • Satoshi Kera
  • ,
  • Frank Schreiber
  • ,
  • Nobuo Ueno

119
52
開始ページ
29027
終了ページ
29037
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1021/acs.jpcc.5b10453
出版者・発行元
AMER CHEMICAL SOC

Thickness and substrate dependence of film growth, morphology, unit-cell structure, and electronic structures was thoroughly investigated for picene, the zigzag connected 5-ring molecule, by employing complementary techniques of in situ real-time X-ray reflectivity/diffraction, in situ electron spectroscopies, and atomic force microscopy. A different kind of thickness dependent structural transition was observed on SiO2 and graphite, resulting in a distinct electronic structure. On SiO2 picene films with 3D crystalline domains are formed with nearly upright molecular orientation from the initial growth stage. With increasing the film thickness the in-plane dimensions of the unit cell in the initially grown domains become smaller (in other words, more compressed), and, at the same time, crystalline domains with a more relaxed structure are nucleating on top of the compressed domains. In spite of such structural changes, the electronic structure, namely energy position of the highest occupied molecular orbital and threshold ionization potential (IPT), is not significantly altered. On graphite, on the other hand, we found a transition from a 2D (layer) to a 3D (island) growth mode with a variation of the molecular orientation from flat-lying to tilted one. The IPT changes significantly between the 2D and 3D growth regime in contrast to the SiO2 system. The origin of the different In of these picene thin films is discussed. The present results are compared with other planar Jr-conjugated compounds, in particular pentacene which is a structural isomer of picene and shows electronic properties strongly different from picene thin films.

Web of Science ® 被引用回数 : 14

リンク情報
DOI
https://doi.org/10.1021/acs.jpcc.5b10453
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000367704500035&DestApp=WOS_CPL

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