2017年4月
Optical control of dielectric permittivity in LaAl0.99Zn0.01O3-delta
APPLIED PHYSICS LETTERS
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- 巻
- 110
- 号
- 17
- 開始ページ
- 172901
- 終了ページ
- 172901
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1063/1.4979644
- 出版者・発行元
- AMER INST PHYSICS
A photo-dielectric effect (i.e., a change in dielectric permittivity due to photo-irradiation) has been demonstrated in LaAl0.99Zn0.01O3-delta. Photo-irradiation with an incident energy of 3.4 eV was found to enhance the dielectric permittivity in LaAl0.99Zn0.01O3-delta over a wide frequency range from 100 Hz to 1MHz. The change in dielectric permittivity in the high-frequency region hardly depended on frequency and was not accompanied by an increase in dielectric loss, indicating an intrinsic photodielectric effect in LaAl0.99Zn0.01O3-delta that is not due to photo-conduction. The dependence of the photo-dielectric effect on incident energy suggests the existence of deep in-gap states introduced by Zn substitution. The mechanism of the photo-dielectric effect in LaAl0.99Zn0.01O3-delta relates to the dielectric response of the photo-excited electrons trapped in the deep in-gap states, which work as effective polar displacements under an applied electric field. These findings are expected to contribute to the development of photo-capacitors that enable the remote control of the dielectric response via photo-irradiation. Published by AIP Publishing.
- リンク情報
- ID情報
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- DOI : 10.1063/1.4979644
- ISSN : 0003-6951
- eISSN : 1077-3118
- ORCIDのPut Code : 68013478
- Web of Science ID : WOS:000400380200032