Light soaking in metal halide perovskites studied via steady-state microwave conductivity
Light soaking in metal halide perovskites studied via steady-state microwave conductivity
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DOI：
10.1038/s42005-020-0350-2
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发表时间：
2020-04
影响因子：
5.5
通讯作者：
C. Watts;Lee Aspitarte;Yen‐Hung Lin;Wen Li;Radwan Elzein;R. Addou;M. J. Hong;G. Herman;H. Snaith;J. Labram
中科院分区：
文献类型：
--
作者：
C. Watts;Lee Aspitarte;Yen‐Hung Lin;Wen Li;Radwan Elzein;R. Addou;M. J. Hong;G. Herman;H. Snaith;J. Labram
光吸收效应是指在恒定光照下，某些太阳能电池的功率转换效率随时间而变化的现象。金属卤化物钙钛矿的光浸理论目前还不完整。在本报告中，我们采用稳态微波电导率，一种半导体电子性质的非接触探针，研究了金属卤化物钙钛矿中的光浸泡效应。通过用AM1.5太阳光照两种混合阳离子钙钛矿的分离薄膜，我们观察到在许多（bbb12）小时内光导率持续增加。我们可以用类似于偏压薄膜晶体管的方式，将实验观察到的光电导变化拟合为拉伸的指数函数。本报告提供的信息应该有助于社区更好地理解钙钛矿太阳能电池领域最令人困惑的开放问题之一，并最终导致更强大和可预测的设备。
The light-soaking effect is the observation that under constant illumination the measured power conversion efficiency of certain solar cells changes as a function of time. The theory of the light-soaking in metal halide perovskites is at present incomplete. In this report, we employ steady-state microwave conductivity, a contactless probe of electronic properties of semiconductors, to study the light-soaking effect in metal halide perovskites. By illuminating isolated thin films of two mixed-cation perovskites with AM1.5 solar illumination, we observe a continual increase in photoconductance over a period of many (>12) hours. We can fit the experimentally observed changes in photoconductance to a stretched exponential function, in an analogous manner to bias-stressed thin-film transistors. The information provided in this report should help the community better understand one of the most perplexing open problems in the field of perovskite solar cells and, ultimately, lead to more robust and predictable devices.