@article{da441b239d444e989cd4d8753ebad2ce,
title = "Surface Sn(IV) Hydrolysis Improves Inorganic Sn-Pb Perovskite Solar Cells",
abstract = "Cesium tin–lead (Sn–Pb) perovskites are exceptional for their combined capabilities in unlocking ideal bandgaps for solar cells and mitigating the stability issue faced by their hybrid organic–inorganic counterparts. But the development of high-performance solar cells using these materials is retarded by their inherent high density of detrimental Sn(IV) defects. Herein, we demonstrate a sequential surface treatment method, which entails a Sn(II) halide treatment to displace the buried Sn(IV) ions underneath the film surface, followed by a H2O treatment to hydrolyze the displaced Sn(IV) ions. The surface treatment induces chemical and microstructural reconstructions that significantly improve the optoelectronic properties and stability of perovskites. As a result, a power conversion efficiency of 16.79% and a T90 stability of 958 h are achieved, topping all previously reported performance parameters for inorganic Sn–Pb PSCs. This achievement further shortens the performance gap between all-inorganic and hybrid organic–inorganic Sn–Pb PSCs with sub-1.4 eV bandgaps.",
author = "Mingyu Hu and Yalan Zhang and Jue Gong and Hua Zhou and Xianzhen Huang and Mingzhen Liu and Yuanyuan Zhou and Shihe Yang",
note = "Funding Information: This work was supported by the NSFC (U2001217, 21972006), the Shenzhen Peacock Plan (KQTD2016053015544057), the Shenzhen-Hong Kong Innovation Circle United Research Project (SGLH20180622092406130), and the China Postdoctoral Science Foundation (2021M690193). Y.Z. acknowledges the Early Career Scheme (No. 22300221), the General Research Fund (No. 12302822) from the Hong Kong Research Grant Council (RGC), and the Excellent Young Scientists Funds (No. 52222318) from the National Natural Science Foundation of China. Y.Z. also acknowledge the start-up grants, the Initiation Grant-Faculty Niche Research Areas (IG-FNRA) 2020/21 and the Interdisciplinary Research Matching Scheme (IRMS) 2020/21 of HKBU. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science user facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Publisher Copyright: {\textcopyright} 2023 American Chemical Society",
year = "2023",
month = feb,
day = "10",
doi = "10.1021/acsenergylett.2c02435",
language = "English",
volume = "8",
pages = "1035--1041",
journal = "ACS Energy Letters",
issn = "2380-8195",
publisher = "American Chemical Society",
number = "2",
}
