(Invited) Modification of Perovskite Layer for Efficient Perovskite Solar Cells

作者：Atsushi Wakamiya · 发表于：ECS Meeting Abstracts · 年份：2024 · DOI：10.1149/ma2024-02191723mtgabs

Perovskite solar cells are expected as promissing photovoltaics, offering a path to highly efficient solar energy conversion.1–4 Surface modification of perovskite layer is crucial to improve device performance and durability. In this talk, our recent progress on the development of charge collecting materials and surface modification with dipole strategy will be shown. Optimized Carrier Extraction at Interfaces 4-7 Carrier extraction in mixed tin–lead perovskite solar cells is improved by modifying the top and bottom perovskite surfaces with ethylenediammonium diiodide and glycine hydrochloride, respectively. Trap densities in the perovskite layers are reduced as a result of surface passivation effects and an increase in film crystallinity. In addition, the orientated aggregation of the ethylenediammonium and glycinium cations at the charge collection interfaces result in the formation of surface dipoles, which facilitate charge extraction. As a result, the treated mixed tin–lead perovskite solar cells showed improved performance, with a fill factor of 0.82 and a power conversion efficiency up to 23.6%.5 The unencapsulated device also shows improved stability under AM1.5G, retaining over 80% of the initial efficiency after 200 h continuous operation in inert atmosphere. Our strategy is also successfully applied to centimeter-scale devices, with efficiencies up to 21.0%. Tripodal Hole-Collecting Monolayer Materials 8 Hole-collecting monolayers have drawn attentio...