Temperature-Dependent Reversal of Phase Segregation in Mixed-Halide Perovskites

被引：36

作者：

Wright, Adam D. ^{[1
]}

Patel, Jay. B. ^{[1
]}

Johnston, Michael B. ^{[1
]}

Herz, Laura M. ^{[1
,2
]}

机构：

[1] Univ Oxford, Dept Phys, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England

[2] Tech Univ Munich TUM, Inst Adv Study, Lichtenbergstr 2a, D-85748 Garching, Germany

来源：

ADVANCED MATERIALS | 2023年 / 35卷 / 19期

基金：

英国工程与自然科学研究理事会;

关键词：

halide segregation; mixed-halide perovskites; photoluminescence; photovoltaic devices; thin films; CHARGE-CARRIER DYNAMICS; TANDEM SOLAR-CELL; HYBRID PEROVSKITES; LEAD PEROVSKITES; OPTOELECTRONIC PROPERTIES; PHOTOINDUCED SEGREGATION; LIGHT; SEPARATION; BROMIDE; PHOTOVOLTAICS;

D O I：

10.1002/adma.202210834

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Understanding the mechanism of light-induced halide segregation in mixed-halide perovskites is essential for their application in multijunction solar cells. Here, photoluminescence spectroscopy is used to uncover how both increases in temperature and light intensity can counteract the halide segregation process. It is observed that, with increasing temperature, halide segregation in CH3NH3Pb(Br0.4I0.6)(3) first accelerates toward approximate to 290 K, before slowing down again toward higher temperatures. Such reversal is attributed to the trade-off between the temperature activation of segregation, for example through enhanced ionic migration, and its inhibition by entropic factors. High light intensities meanwhile can also reverse halide segregation; however, this is found to be only a transient process that abates on the time scale of minutes. Overall, these observations pave the way for a more complete model of halide segregation and aid the development of highly efficient and stable perovskite multijunction and concentrator photovoltaics.

引用

页数：8

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