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PhysRevMaterials.4.074604.pdf | 423.62 kB | Adobe PDF | 見る/開く |
タイトル: | Large thermal expansion leads to negative thermo-optic coefficient of halide perovskite CH₃NH₃PbCl₃ |
著者: | Handa, Taketo Tahara, Hirokazu ![]() ![]() Aharen, Tomoko Shimazaki, Ai Wakamiya, Atsushi ![]() ![]() ![]() Kanemitsu, Yoshihiko ![]() ![]() ![]() |
著者名の別形: | 半田, 岳人 田原, 弘量 嶋﨑, 愛 若宮, 淳志 金光, 義彦 |
発行日: | Jul-2020 |
出版者: | American Physical Society (APS) |
誌名: | Physical Review Materials |
巻: | 4 |
号: | 7 |
論文番号: | 074604 |
抄録: | Lead halide perovskites have emerged as new optoelectronic materials owing to their outstanding optical properties. There has been increased interest in their temperature-sensitive optical properties and new optical applications have been proposed thereby. Here, we report the origin of the unusual negative thermo-optic coefficient of the halide perovskite CH₃NH₃PbCl₃, i.e., a decrease in the refractive index by an increase in temperature. From the temperature dependences of the absorption spectrum and the lattice constant and using the Lorentz oscillator model, we conclude that the negative thermo-optic coefficient below the absorption edge is predominantly determined by the large thermal expansion coefficient inherent to this soft material system. This work demonstrates that the negative thermo-optic coefficient is a distinctive phenomenon reflecting the unique electronic and lattice properties of halide perovskites. |
著作権等: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. |
URI: | http://hdl.handle.net/2433/261134 |
DOI(出版社版): | 10.1103/PhysRevMaterials.4.074604 |
出現コレクション: | 学術雑誌掲載論文等 |
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