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

引用

Energy & Environmental Materials 2023年第2期6卷 113-119页

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 Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering National University of SingaporeSingapore 117576Singapore Shenzhen Engineering Research and Development Center for Flexible Solar Cells Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology) Ministry of EducationShenzhen 518055China Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Southern University of Science and TechnologyShenzhen 518055China SUSTech Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China Shenzhen Putai Technology Co. LtdShenzhen 518110China

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 *** 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 *** 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 ***,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 *** 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 ***,the optimized device shows improved environmental *** 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

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