钙钛矿(结构)
材料科学
开路电压
能量转换效率
光伏系统
熔盐
光伏
相(物质)
串联
带隙
化学工程
二甲胺
光电子学
电压
有机化学
化学
电气工程
冶金
复合材料
工程类
作者
Yuqi Cui,Jiangjian Shi,Fanqi Meng,Bingcheng Yu,Shan Tan,Shan He,Chengyu Tan,Yiming Li,Huijue Wu,Yanhong Luo,Dongmei Li,Qingbo Meng
标识
DOI:10.1002/adma.202205028
摘要
Abstract All‐inorganic CsPbI 3 perovskite has emerged as an important photovoltaic material due to its high thermal stability and suitable bandgap for tandem devices. Currently, the cell performance of CsPbI 3 solar cells is mainly subject to a large open‐circuit voltage ( V OC ) deficit. Herein, a multifunctional room‐temperature molten salt, dimethylamine acetate (DMAAc) is demonstrated, which not only directly acts as a solvent for precursor solutions, but also regulates the phase conversion process of the CsPbI 3 film for high‐efficiency photovoltaics. DMAAc can stabilize the DMAPbI 3 structure and eliminate the Cs 4 PbI 6 intermediate phase, which is easily spatially segregated. Meanwhile, a new homogeneous intermediate phase DMAPb(I,Ac) 3 is formed, which finally affords high‐quality CsPbI 3 films. With this approach, the charge capture activity of defects in the CsPbI 3 film is significantly suppressed. Consequently, a V OC of 1.25 V and >21% power conversion efficiency are achieved, which is the record highest reported thus far. This intermediate phase‐regulation strategy is believed to be applicable to other perovskite material systems.
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