钙钛矿(结构)
能量转换效率
材料科学
阳极
光电子学
图层(电子)
载流子
电子迁移率
钙钛矿太阳能电池
纳米技术
电极
化学
结晶学
物理化学
作者
Wei Hui,Xinxin Kang,Baohua Wang,Deli Li,Zhenhuang Su,Yaqi Bao,Lei Gu,Biao Zhang,Xingyu Gao,Lin Song,Wei Huang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-03-13
卷期号:23 (6): 2195-2202
被引量:21
标识
DOI:10.1021/acs.nanolett.2c04720
摘要
Due to their low cost and simplified production process, electron-transport-layer-free (ETL-free) perovskite solar cells (PSCs) have attracted great attention recently. However, the performance of ETL-free PSCs is still at a disadvantage compared to cells with a conventional n-i-p structure due to the severe recombination of charge carriers at the perovskite/anode interface. Here, we report a strategy to fabricate stable ETL-free FAPbI3 PSCs by in situ formation of a low dimensional perovskite layer between the FTO and the perovskite. This interlayer gives rise to the energy band bending and reduced defect density in the perovskite film and indirect contact and improved energy level alignment between the anode and perovskite, which facilitates charge carrier transport and collection and suppresses charge carrier recombination. As a result, ETL-free PSCs with a power conversion efficiency (PCE) exceeding 22% are achieved under ambient conditions.
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