期刊
SOLAR RRL
卷 2, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201800188
关键词
high voltage; high efficiency; inorganic perovskite; solar cell; surface passivation
资金
- National Science Foundation of China [51774034, 51772026, 51611130063]
- Beijing Natural Science Foundation [2182039]
- Fundamental Research Funds for the Central Universities [FRF-TP-17-030A1, FRF-TP-17-083A1, FRF-TP-17-082A1, TW2018010]
- China Postdoctoral Science Foundation [2017M620611, 2018M630068]
Cesium halide perovskite CsPbX3 has emerged to be a promising candidate for photovoltaic materials due to their componential and thermal stability. During the fabrication of CsPbX3 films, rich halide ions could cause deep trap states on the surface of the perovskite film, leading to much charge recombination. Herein, Pb2+ solution post-processing strategy is introduced to passivate the deep trap states of CsPbI2Br films. The dissociative Pb2+ in the solution effectively combines with the excess halide ions on the perovskite surface to reduce the deep trap states of Pb vacancy (V-Pb) and I interstitial (I-i). As a result, the average photoluminescence lifetimes (ave) of the perovskite film prolonged nearly double after passivation. The trap density of perovskite is effectively decreased from 8x10(16) to 6.64x10(16)cm(-3). The CsPb2Br solar cell shows an open-circuit-voltage as high as 1.29V and power conversion efficiency of 12.34% with small hysteresis. The postprocessing method would provide an avenue to improve further the efficiency of inorganic perovskite solar cells via reducing surface traps.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据