Antioxidative solution processing yields exceptional Sn(Ⅱ) stability for sub-1.4 eV bandgap inorganic perovskite solar cells  

作　　者：Mingyu Hu Gaopeng Wang Qinghong Zhang Jue Gong Zhou Xing Jinqiang Gao Jian Wang Peng Zeng Shizhao Zheng Mingzhen Liu Yuanyuan Zhou Shihe Yang 

机构地区：[1]Guangdong Provincial Key Lab of Nano-Micro Materials Research,School of Chemical Biology and Biotechnology,Shenzhen Graduate School,Peking University,Shenzhen 518055,Guangdong,China [2]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China [3]Department of Physics,Hong Kong Baptist University,Kowloon,Hong Kong 999077,China [4]Smart Society Lab,Hong Kong Baptist University,Kowloon,Hong Kong 999077,China [5]Institute of Biomedical Engineering,Shenzhen Bay Laboratory,Shenzhen 518055,Guangdong,China

出　　处：《Journal of Energy Chemistry》2022年第9期487-494,I0014,共9页能源化学（英文版）

基　　金：supported by the NSFC(U2001217,21972006);the Shenzhen Peacock Plan(KQTD2016053015544057);the Shenzhen-Hong Kong Innovation Circle United Research Project(SGLH20180622092406130);the Shenzhen Fundamental Research Program(JCYJ20190813105205501);the Research Fund Program of Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices(2019B121203003);the Early Career Scheme(22300221)from the Hong Kong Research Grant Council and the start-up grants,Initiation Grant Faculty Niche Research Areas(IG-FNRA)2020/21,Interdisciplinary Matching Scheme 2020/21,startup grants of the Hong Kong Baptist University(HKBU);the China Postdoctoral Science Foundation(2021M690193)。

摘　　要：Owing to the combined features of sub-1.4 eV bandgap and all-inorganic composition,cesium tin–lead(Sn-Pb)triiodide perovskite is promising for approaching the Shockley-Queisser limit of solar cells while avoiding the use of volatile organic cations.But the low Sn(Ⅱ)stability in this perovskite remains a hurdle for delivering its theoretically attainable device performance.Herein we present a synthesis method of this perovskite based on an acetylhydrazine-incorporated antioxidative solution system.Mechanistic investigation shows that acetylhydrazine effectively reduces the oxidation of solution-phase Sn(Ⅱ)and meanwhile creates an electron-rich,protective nano-environment for solid-state Sn(Ⅱ)ions.These lead to high oxidation resistance of the final film as well as effective defect inhibition.The resultant solar cells demonstrate power conversion efficiencies up to 15.04%,the highest reported so far for inorganic perovskite devices with sub-1.4 eV bandgaps.Furthermore,the T_(90) lifetime of these devices can exceed 1000 hours upon light soaking in a nitrogen atmosphere,demonstrating the potential advantage when lower-bandgap perovskite solar cells go all-inorganic.

关 键 词：Inorganic perovskites Ideal-bandgap Perovskite solar cells Tin defects Efficiency 

分 类 号：TB34[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]