钝化
钙钛矿(结构)
锡
表面光电压
材料科学
光电子学
带隙
碘化物
能量转换效率
光伏系统
铅(地质)
曲面(拓扑)
纳米技术
化学物理
化学
无机化学
电气工程
图层(电子)
冶金
物理
结晶学
工程类
地质学
地貌学
量子力学
数学
光谱学
几何学
作者
Rajendra Kumar Gunasekaran,Jina Jung,Sung Woong Yang,D.H. Im,Won Chang Choi,Yeonghun Yun,Sangwook Lee
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2023-12-08
卷期号:: 102-109
被引量:1
标识
DOI:10.1021/acsenergylett.3c02402
摘要
We present a surface reconstruction strategy for tin–lead perovskites, effectively addressing the issue of oxidized Sn fragments on surfaces and interfaces. Our surface treatment involving postfabrication iodide supplementation effectively regulates undesired surface binding states and reconstructs the compositional gradient. Through surface-sensitive and depth-resolved analysis, we unveil a strong correlation among surface compositional disorder, photovoltage, and operational stability in tin–lead perovskites. Surface-reconstructed perovskite films demonstrate improved carrier lifetime, reduced defect density, and higher recombination resistance compared with untreated films. As a result, devices utilizing surface-reconstructed perovskites exhibit remarkable performance with high power conversion efficiency (up to 23%) and open-circuit voltage (0.88 V), alongside enhanced operational stability compared to untreated counterparts. These insights into the surface vulnerabilities of mixed tin–lead perovskites, coupled with the underlying chemistry of surface passivation, pave the way for significant advancements in narrow-band gap perovskite solar cells.
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