Inorganic‐Derived 0D Perovskite Induced Surface Lattice Arrangement for Efficient and Stable All‐Inorganic Perovskite Solar Cells
Jin Hyuck Heo, Jin Kyoung Park, Hyong Joon Lee, E. Shin, Seok Yeong Hong, Ki‐Ha Hong, Fei Zhang, Sang Hyuk Im
Abstract
Abstract The inverted inorganic CsPbI 3 perovskite solar cells (PSCs) are prospective candidates for next‐generation photovoltaics owing to inherent robust thermal/photo‐stability and compatibility for tandems. However, the performance and stability of the inverted CsPbI 3 PSCs fall behind the n‐i‐p counterparts due to poor energetic alignment and abundant interfacial defect states. Here, an inorganic 0D Cs 4 PbBr 6 with a good lattice strain arrangement is implemented as the surface anchoring capping layer on CsPbI 3 . The Cs 4 PbBr 6 perovskite induces enhanced electron‐selective junction and thus facilitates efficient charge extraction and effectively inhibits non‐radiative recombination. Consequently, the CsPbI 3 PSCs with Cs 4 PbBr 6 demonstrate the highest power conversion efficiency (PCE) of CsPbI 3 ‐based inverted PSCs, reaching 21.03% PCE from a unit cell and 17.39% PCE from a module with a 64 cm 2 aperture area. Furthermore, the resulting devices retain 92.48% after 1000 h under simultaneous 1‐sun and damp heat (85 °C / 85% relative humidity) environment.