DataVXACS Energy LettersPaper
journal article·2023-02-10Open access

Surface Sn(IV) Hydrolysis Improves Inorganic Sn–Pb Perovskite Solar Cells

Mingyu Hu, Yalan Zhang, Jue Gong, Hua Zhou, Xianzhen Huang, Mingzhen Liu, Yuanyuan Zhou, Shihe Yang

ACS Energy Letters· Volume 8· Issue 2
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Abstract

High Resolution Image Download MS PowerPoint Slide 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 H 2 O 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 T 90 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.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Organic Electronics and Photovoltaics

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Affiliations

Guangdong Provincial Key Lab of Nano-Micro Materials Research, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen 518055, Guangdong, People’s Republic of China

Department of Physics, Hong Kong Baptist University, Kowloon, Hong Kong 999077, People’s Republic of China

School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, People’s Republic of China

X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States

Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen 518055, Guangdong, People’s Republic of China

Funding

Research Grants Council, University Grants Committee · Hong Kong Baptist University · China Postdoctoral Science Foundation · Science, Technology and Innovation Commission of Shenzhen Municipality · National Natural Science Foundation of China · Shenzhen-Hong Kong Innovation Circle United Research Project

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