钙钛矿(结构)
二茂铁
材料科学
图层(电子)
化学工程
混合层
纳米技术
结晶学
化学
电极
地质学
电化学
物理化学
工程类
气候学
作者
Tzung-Pei Hong,Huijie Zhang,Rui Zhi,Yi‐Chen Zhou,Zheng‐Wen Xie,Jin Zhang,Margaret Rothman,Yang Jiang,Yin Zhi-Wen,Jinhui Tong,Yi‐Bing Cheng,Wei Li
出处
期刊:Solar RRL
[Wiley]
日期:2024-03-05
卷期号:8 (8)
标识
DOI:10.1002/solr.202400035
摘要
The Sn–Pb mixed perovskite with a narrow bandgap is essential for the construction of all‐perovskite tandem solar cells. However, the oxidation of Sn 2+ to Sn 4+ makes the fabrication of Sn–Pb perovskite solar cells (PSCs) challenging. Herein, a ferrocene (Fc) capping layer is introduced on the surface of Sn–Pb mixed perovskite to maintain a reducing environment. This is due to a strong electron supply capacity from the π ‐orbitals in cyclopentadiene in Fc, which effectively suppresses the oxidation of Sn 2+ , reduces the defect density, and leads to an improvement in carrier lifetime. Therefore, the Fc capping layer significantly improves the power conversion efficiency (PCE) of single‐junction Sn–Pb PSCs from 17.49% to 21.02%. It maintains 87% of its initial PCE after light exposure at 1 sun condition in N 2 atmosphere for 288 h, demonstrating good long‐term stability. The strategy outlined herein offers a straightforward and efficient approach to enhance the stability and PCE of narrow‐bandgap Sn–Pb mixed PSCs.
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