Impact of Precursor Concentration on Perovskite Crystallization for Efficient Wide-Bandgap Solar Cells |
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| Authors: | Shuxian Du Jing Yang Shujie Qu Zhineng Lan Tiange Sun Yixin Dong Ziya Shang Dongxue Liu Yingying Yang Luyao Yan Xinxin Wang Hao Huang Jun Ji Peng Cui Yingfeng Li Meicheng Li |
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| Affiliation: | 1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of New Energy, North China Electric Power University, Beijing 102206, China; (S.D.); (S.Q.); (Z.L.); (Y.Y.); (L.Y.); (X.W.); (H.H.); (J.J.); (P.C.); (Y.L.);2.China Three Gorges Corporation, Institute of Science and Technology, Beijing 100038, China; (J.Y.); (T.S.); (Y.D.); (Z.S.); (D.L.) |
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| Abstract: | High-crystalline-quality wide-bandgap metal halide perovskite materials that achieve superior performance in perovskite solar cells (PSCs) have been widely explored. Precursor concentration plays a crucial role in the wide-bandgap perovskite crystallization process. Herein, we investigated the influence of precursor concentration on the morphology, crystallinity, optical property, and defect density of perovskite materials and the photoelectric performance of solar cells. We found that the precursor concentration was the key factor for accurately controlling the nucleation and crystal growth process, which determines the crystallization of perovskite materials. The precursor concentration based on Cs0.05FA0.8MA0.15Pb(I0.84Br0.16)3 perovskite was controlled from 0.8 M to 2.3 M. The perovskite grains grow larger with the increase in concentration, while the grain boundary and bulk defect decrease. After regulation and optimization, the champion PSC with the 2.0 M precursor concentration exhibits a power conversion efficiency (PCE) of 21.13%. The management of precursor concentration provides an effective way for obtaining high-crystalline-quality wide-bandgap perovskite materials and high-performance PSCs. |
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| Keywords: | perovskite solar cells wide-bandgap precursor concentration crystallization |
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