Tailored Phase Transformation of CsPbIBr Films by Copper(II) Bromide for High-Performance All-Inorganic Perovskite Solar Cells.

Author(s) Wang, K.L.; Wang, R.; Wang, Z.K.; Li, M.; Zhang, Y.; Ma, H.; Liao, L.S.; Yang, Y.
Journal Nano Lett
Date Published 2019 Jul 18

All-inorganic-based perovskites achieved by replacing the organic component with cesium (Cs) have drawn more attention because of their intrinsic inorganic stability. However, the cell efficiency in all-inorganic perovskite solar cells is still far below that in organic-inorganic hybrid perovskite-based devices. Here, we develop a new strategy to mediate the CsPbIBr crystallization by directly doping copper(II) bromide (CuBr) into a perovskite precursor. The incorporation of CuBr played a role in retarding the crystallization dynamics process of CsPbIBr film, resulting in a high-quality all-inorganic perovskite film with enlarged grain size, improved carrier mobilities, and reduced trap states. The fabricated perovskite solar cells delivered a champion power conversion efficiency of 16.15%, which is the highest efficiency in CsPbIBr based all-inorganic perovskite solar cells and largely higher than 13.24% for pristine CsPbIBr based device. The developed doping method paves a new route to fabricate high-performance all-inorganic perovskite solar cells.

DOI 10.1021/acs.nanolett.9b01553
ISSN 1530-6992
Citation Nano Lett. 2019.

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