Au Nanocluster Assisted Microstructural Reconstruction for Buried Interface Healing for Enhanced Perovskite Solar Cell Performance

• DOI: 10.1002/adma.202310651
• Publication Date: 2023-11-29T00:30:18Z
• Authors: Kun Li; Lu Zhang; Yabin Ma; Yajun Gao; Xiaolong Feng; Qiang Li; Li Shang; Ningyi Yuan; Jianning Ding; Alex K. Y. Jen; Jiaxue You; Shengzhong (Frank...
• Keywords: Nanoclusters; Hysteresis; Charge carrier; Perovskite solar cell; Carrier lifetime

Abstract The heterogeneity of perovskite film crystallization along the vertical direction leads to voids and traps at buried interfaces, hampering both efficiency stability solar cells. Here, bovine serum albumin‐functionalized Au nanoclusters (ABSA), combined with heavy gravity, high surface charge density, strong interactions electron transport layer, are designed reconstruct interfaces for not only high‐quality crystallization, but also improved carrier transfer. ABSA macromolecules amine function groups larger density interact improve crystallinity, gradually migrate towards interface, healing defective voids, hence suppressing recombination velocity from 3075 452 cm s −1 . healed interface higher potential ABSA‐modified TiO 2 lead extraction interface. resulting cell attains a power conversion 25.0% negligible hysteresis remarkable stability, maintaining 92.9% their initial after 3200 h exposure ambient atmosphere, they exhibit better continuous irradiation compared control devices. These findings provide new metal‐protein complex eliminate deleterious defects photovoltaic performance stability.