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Near-Stoichiometric and Homogenized Perovskite Films for Solar Cells with Minimized Performance Variation |
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| Authors: | Wenhuai Feng Junlei Tao Gengling Liu Guo Yang Dr Jun-Xing Zhong Yuxuan Fang Li Gong Prof Shaopeng Yang Prof Wu-Qiang Wu |
| Institution: | 1. Key Laboratory of Bioinorganic and Synthetic Chemistry (MoE), Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-sen University, Guangzhou, 510006 China
Contribution: Data curation (lead), Investigation (lead), Writing - original draft (lead);2. Province-Ministry Co-construction Collaborative Innovation Center of Hebei Photovoltaic Technology, College of Physics Science and Technology, Hebei University, Baoding, 071002 China Contribution: Data curation (equal), Formal analysis (equal);3. Key Laboratory of Bioinorganic and Synthetic Chemistry (MoE), Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-sen University, Guangzhou, 510006 China Contribution: Data curation (supporting), Formal analysis (supporting), Writing - original draft (supporting);4. Key Laboratory of Bioinorganic and Synthetic Chemistry (MoE), Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-sen University, Guangzhou, 510006 China Contribution: Data curation (supporting), Resources (supporting);5. Instrumental Analysis Research Center, Sun Yat-sen University, Guangzhou, 510275 China Contribution: Data curation (supporting);6. Province-Ministry Co-construction Collaborative Innovation Center of Hebei Photovoltaic Technology, College of Physics Science and Technology, Hebei University, Baoding, 071002 China Contribution: Data curation (supporting), Formal analysis (supporting), Writing - original draft (supporting);7. Key Laboratory of Bioinorganic and Synthetic Chemistry (MoE), Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-sen University, Guangzhou, 510006 China |
| Abstract: | Mixed-cation, small band-gap perovskites via rationally alloying formamidinium (FA) and methylammonium (MA) together have been widely employed for blade-coated perovskite solar cells with satisfied efficiencies. One of the stringent challenges lies in difficult control of the nucleation and crystallization kinetics of the perovskites with mixed ingredients. Herein, a pre-seeding strategy by mixing FAPbI3 solution with pre-synthesized MAPbI3 microcrystals has been developed to smartly decouple the nucleation and crystallization process. As a result, the time window of initialized crystallization has been greatly extended by 3 folds (i.e. from 5 s to 20 s), which enables the formation of uniform and homogeneous alloyed-FAMA perovskite films with designated stoichiometric ratios. The resultant blade-coated solar cells achieved a champion efficiency of 24.31 % accompanied by outstanding reproducibility with more than 87 % of the devices showing efficiencies higher than 23 %. |
| Keywords: | Blade-Coating Chemical Homogeneity Crystal Pre-Seeding Perovskite Solar Cells |