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Zhang, Fei; Park, So Yeon; Yao, Canglang; Lu, Haipeng; Dunfield, Sean P; Xiao, Chuanxiao; Uličná, Soňa; Zhao, Xiaoming; Du Hill, Linze; Chen, Xihan; Wang, Xiaoming; Mundt, Laura E; Stone, Kevin H; Schelhas, Laura T; Teeter, Glenn; Parkin, Sean; Ratcliff, Erin L; Loo, Yueh-Lin; Berry, Joseph J; Beard, Matthew C; Yan, Yanfa; Larson, Bryon W; Zhu, Kai
Science (American Association for the Advancement of Science), 2022-Jan-07, 2022-01-07, 20220107, Volume: 375, Issue: 6576Journal Article
The performance of three-dimensional (3D) organic-inorganic halide perovskite solar cells (PSCs) can be enhanced through surface treatment with 2D layered perovskites that have efficient charge transport. We maximized hole transport across the layers of a metastable Dion-Jacobson (DJ) 2D perovskite that tuned the orientational arrangements of asymmetric bulky organic molecules. The reduced energy barrier for hole transport increased out-of-plane transport rates by a factor of 4 to 5, and the power conversion efficiency (PCE) for the 2D PSC was 4.9%. With the metastable DJ 2D surface layer, the PCE of three common 3D PSCs was enhanced by approximately 12 to 16% and could reach approximately 24.7%. For a triple-cation–mixed-halide PSC, 90% of the initial PCE was retained after 1000 hours of 1-sun operation at ~40°C in nitrogen.
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