Determination of bandgaps of photoactive materials in perovskite solar cells at high temperatures by in-situ temperature-dependent resistance measurement

• Published in: Optoelectronics letters Vol. 12; no. 5; pp. 337 - 339
• Main Author: 朱浩 赵祖斌 曹焕奇 于昊 李今朝 陈晓敏 董素娟 杨利营 印寿根
• Format: Journal Article
• Language: English
• Published: Tianjin Tianjin University of Technology 01.09.2016; Springer Nature B.V
• Subjects: Absorption spectra; Decomposition; Energy gap; High temperature; Lasers; Optical Devices; Optics; Perovskites; Photonics; Photovoltaic cells; Physics; Physics and Astronomy; Solar cells; Temperature dependence; Ultraviolet absorption; 光敏材料; 分解温度; 原位; 太阳能电池; 带隙; 测定; 电阻测量; 钙钛矿
• ISSN: 1673-1905; 1993-5013
• DOI: 10.1007/s11801-016-6175-2

Normally, it is difficult to directly measure the bandgaps of perovskite based on methylammonium（MA） or formamidinium（FA） at high temperatures due to material decomposition. We prevent the decomposition by keeping the synthesized perovskite films（MAPbI_3 and MAPbI_3） in organic iodide vapors, then measure the in-situ resistance of the films at varied temperatures, and further evaluate the bandgaps of these two materials. The evaluated bandgaps are consistent with the results from ultraviolet-visible（UV-vis） absorption spectrum. The bandgap of MAPbI_3 decreases with temperature above 95 ℃, whereas that of FAPbI_3 first increases with temperature from 95 ℃ to 107 ℃ and then decreases with temperature above 107 ℃.