Abstract
Tin-based perovskite solar cells (TPSCs) as the most promising candidate for lead-free PSCs have incurred extensive researches all over the world. However, the crystallization process of tin-based perovskite is too fast during the solution-deposited process, resulting in abundant pinholes and poor homogeneity that cause serious charge recombination in perovskite layer. Here, we employed the π-conjugated Lewis base molecules with high electron density to systematically control the crystallization rate of FASnI3 perovskite by forming stable intermediate phase with the Sn-I frameworks, leading to a compact and uniform perovskite film with large increase in the carrier lifetime. Meanwhile, the introduction of the π-conjugated systems also retards the permeation of moisture into perovskite crystal, which significantly suppresses the film degradation in air. These benefits contributed to a stabilizing power conversion efficiency (PCE) of 10.1% for the TPSCs and maintained over 90% of its initial PCE after 1000-h light soaking in air. Also, a steady-state efficiency of 9.2% was certified at the accredited test center.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (11574199, 11674219, 11834011), and the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning. The work performed at National Institute for Materials Science was supported by the New Energy and Industrial Technology Development Organization (NEDO, Japan), and the KAKEHI Grant of Japan (18H02078).
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Wu, T., Liu, X., He, X. et al. Efficient and stable tin-based perovskite solar cells by introducing π-conjugated Lewis base. Sci. China Chem. 63, 107–115 (2020). https://doi.org/10.1007/s11426-019-9653-8
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DOI: https://doi.org/10.1007/s11426-019-9653-8