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Monodisperse Adducts-Induced Homogeneous Nucleation Towards High-Quality Tin-Based Perovskite Film |
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| Authors: | Huan Rao Yang Su Gengling Liu Hongbo Zhou Jia Yang Wangping Sheng Yang Zhong Prof Licheng Tan Prof Yiwang Chen |
| Institution: | 1. College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry (IPEC)/Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031 China
These authors contributed equally to this work. Contribution: Investigation (lead), Methodology (lead), Writing - original draft (lead);2. College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry (IPEC)/Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031 China These authors contributed equally to this work. Contribution: Investigation (equal), Methodology (equal), Writing - original draft (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 (equal);4. College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry (IPEC)/Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031 China Contribution: Software (equal);5. College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry (IPEC)/Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031 China Contribution: Writing - review & editing (equal);6. College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry (IPEC)/Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031 China Contribution: Resources (equal);7. College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry (IPEC)/Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031 China Contribution: Investigation (equal);8. College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry (IPEC)/Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031 China |
| Abstract: | The classic solvent system can't sufficiently separate one-dimensional edge-sharing SnI2 crystals in solution, which severely restricts the fabrication of high-quality tin-based perovskite film. Herein, a strong Lewis base (hexamethylphosphoramide, HMPA) has been introduced to coordinate Sn2+ to modulate solvation behaviours on perovskite precursor and regulate crystallization kinetics. The large molecular volume of HMPA and stronger bind energy of SnI2 ⋅ 2HMPA (−0.595 eV vs −0.118 eV for SnI2 ⋅ 2DMSO) change the solvation structure of SnI2 from edge-sharing cluster to monodisperse adduct, which contributes to uniform nucleation sites and prolongs crystal growth process. Delightfully, a fully-covered perovskite film is formed on the large-area substrate and tin-based perovskite solar cells processed with HMPA exhibit an excellent efficiency of 13.46 %. This research provides novel insights and directions for the solution preparation of smooth and uniform large-area tin-based perovskite film. |
| Keywords: | Monodisperse Adduct Uniform Nucleation Crystallization Tin-Based Perovskite Solar Cells |