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Title: Large negative thermo-optic coefficients of a lead halide perovskite
Authors: Handa, Taketo
Tahara, Hirokazu  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-0738-5623 (unconfirmed)
Aharen, Tomoko
Kanemitsu, Yoshihiko  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-0788-131X (unconfirmed)
Author's alias: 半田, 岳人
田原, 弘量
阿波連, 知子
金光, 義彦
Issue Date: 3-Jul-2019
Publisher: American Association for the Advancement of Science (AAAS)
Journal title: Science Advances
Volume: 5
Issue: 7
Thesis number: eaax0786
Abstract: Lead halide perovskites are promising semiconductors for high-performance photonic devices. Because the refractive index determines the optimal design and performance limit of the semiconductor devices, the refractive index and its change upon external modulations are the most critical properties for advanced photonic applications. Here, we report that the refractive index of halide perovskite CH3NH3PbCl3 shows a distinct decrease with increasing temperature, i.e., a large negative thermo-optic coefficient, which is opposite to those of conventional inorganic semiconductors. By using this negative coefficient, we demonstrate the compensation of thermally induced optical phase shifts occurring in conventional semiconductors. Furthermore, we observe a large and slow refractive index change in CH3NH3PbCl3 during photoirradiation and clarify its origin to be a very low thermal conductivity supported by theoretical analysis. The giant thermo-optic response of CH3NH3PbCl3 facilitates efficient phase modulation of visible light.
Description: 負の屈折率温度係数を示す新しい半導体を発見 --ハロゲン化金属ペロブスカイトを用いた光学温度補償に成功--. 京都大学プレスリリース. 2019-07-22.
Rights: © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
URI: http://hdl.handle.net/2433/243168
DOI(Published Version): 10.1126/sciadv.aax0786
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2019-07-22
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