Small Molecule Passivation Leading to Efficient Hole Transport Layer‐Free Sn–Pb Mixed Perovskite Solar Cells with High Open‐Circuit Voltage

钝化 开路电压 钙钛矿(结构) 能量转换效率 材料科学 手套箱 电压 光电子学 串联 带隙 化学工程 电气工程 纳米技术 化学 图层(电子) 工程类 复合材料 冶金 有机化学
作者
Hang Hu,Jiyao Zhang,Yulan Huang,Deng Wang,Dongyang Li,Jiabang Chen,Zhenhua Wu,Luozheng Zhang,Xianyong Zhou,Bihua Hu,Xingzhu Wang,Jianyong Ouyang,Baomin Xu
出处
期刊:Solar RRL [Wiley]
卷期号:6 (12) 被引量:9
标识
DOI:10.1002/solr.202200721
摘要

There have been a number of remarkable signs of progress achieved in tin–lead mixed narrow‐bandgap perovskite solar cells (PSCs) due to the high theoretical power conversion efficiency (PCE) and their promising application in tandem devices. Indeed, Sn–Pb mixed PSCs without a hole transport layer (HTL) also have been more attractive owing to lower cost and simplification of the device structure. However, the defects in perovskite film introduced by Sn 2+ oxidation severely restrict device efficiency and stability.Herein, a small organic molecule, 4,4'‐sulfonyldiphenol, is employed to passivate perovskite ( E g = 1.26 eV) surface to decrease the interfacial defects and suppress the nonradiative carrier recombination. Furthermore, by regulating energy‐level alignment, charge carrier extraction is greatly facilitated. The device performance is significantly enhanced in that the champion PCE is enlarged to 21.43% with an open‐circuit voltage ( V oc ) of 0.876 V from only 18.02% with a V oc of 0.770 V. The stability of unencapsulated devices is improved substantially as well while retaining 80% PCE of its initial value after being stored in the glovebox for around 600 h. This facile but highly effective strategy successfully proposes the promising development of HTL‐free Sn–Pb mixed PSCs.
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