Crystallization Regulation and Morphological Evolution for HTM-free Tin-Lead (1.28eV) Alloyed Perovskite Solar Cells  

作　　者：Hang Hu Xianyong Zhou Jiabang Chen Deng Wang Dongyang Li Yulan Huang Luozheng Zhang Yuanjun Peng Feng Wang Jingxia Huang Naichao Chen Liang Sun Xuesong Liu Xingzhu Wang Jianyong Ouyang Baomin Xu 

机构地区：[1]Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [2]Department of Materials Science and Engineering,National University of Singapore,Singapore 117576,Singapore [3]Shenzhen Engineering Research and Development Center for Flexible Solar Cells,Southern University of Science and Technology,Shenzhen 518055,China [4]Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology),Ministry of Education,Shenzhen 518055,China [5]Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices,Southern University of Science and Technology,Shenzhen 518055,China [6]SUSTech Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen 518055,China [7]Shenzhen Putai Technology Co.,Ltd,Shenzhen 518110,China

出　　处：《Energy & Environmental Materials》2023年第2期113-119,共7页能源与环境材料（英文）

基　　金：financially supported by the Joint Funds Project funding from Guangdong Basic and Applied Basic Research Foundation(Grant No.2019B1515120083);the National Natural Science Foundation of China(Grant No.U19A2089);the Key Fundamental Research Project funding from the Shenzhen Science and Technology Innovation Committee(Grant No.JCYJ20200109141014474);the National Key Research and Development Project from the Ministry of Science and Technology of China(Grants Nos.2016YFA0202400 and 2016YFA0202404);the Peacock Team Project from Shenzhen Science and Technology Innovation Committee(Grant No.KQTD2015033110182370);Shenzhen Engineering R&D Center for Flexible Solar Cells project funding from Shenzhen Development and Reform Committee(Grant No.2019-126);the Guangdong-Hong Kong-Macao Joint Laboratory(Grant No.2019B121205001).

摘　　要：There have been huge achievements of all-perovskite tandem solar cells,which recently realized the highest power conversion efficiency of 24.8%.However,the complex device structure and complicated manufacture processes severely restrict the further development of all-perovskite tandem solar cells.In this work,we successfully fabricated high-efficiency hole transport material-free(HTM-free)Sn−Pb alloyed narrow bandgap perovskite solar cells(PSCs)by introducing guanidinium thiocyanate(GASCN)and hydroiodic acid(HI)into the perovskite precursor solution.GASCN and HI play a positive synergy effect during perovskite crystallization process resulting in larger grain size,fewer surface defects,and lower trap density to suppress the Sn^(2+)oxidation degradation.Furthermore,they could effectively adjust the energy level of perovskite materials,reduce the energy level difference between perovskite and ITO resulting in more efficiently transport of free hole charge carriers.As a result,with adding GASCN and HI,the achieved highest power conversion efficiency of HTM-free devices increased from 12.58%to 17.85%,which is one of the highest PCEs among all values reported to date for the HTM-free narrow-bandgap(1.2-1.4 eV)Sn−Pb binary PSCs.Moreover,the optimized device shows improved environmental stability.Our additive strategy manifests a remarkable step towards the facile,cost-efficient fabrication of HTM-free perovskite-based tandem solar cells with both high efficiency and simple fabrication process.

关 键 词：crystallization regulation hole transport layer-free mixed tin-lead narrow bandgap perovskite solar cells 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TQ127.11[化学工程—无机化工]