Suppressing the Interface Photodegradation towards Efficient and Stable All Perovskite Tandem Solar Cells

作者：Zhuojia Lin, Jianwei Chen, Kezhou Fan, Jicheng Yi, Honggang Chen, Shibing Zou, Hongyu Min, Yitong Xu, Man Yu Lam, Sergeev A. Aleksandr, Kam Sing Wong, He Yan, Keyou Yan · 发表于：Angewandte Chemie International Edition · 年份：2025 · DOI：10.1002/anie.202424825 · 被引用次数：11 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Organic Electronics and Photovoltaics

Abstract All perovskite tandem solar cells (PTSCs) were expected to overcome the Shockley‐Queisser limit of single‐junction perovskite solar cells (PSCs). Nevertheless, wide bandgap (WBG) subcells suffer from large photovoltage loss and device instability due to extensive film defect, interfacial degradation and phase segregation. Herein, a polymeric multi‐dentate anchoring (PMDA) strategy by introducing poly(carbazole phosphonic acid) was employed to engineer the bottom interface and suppress phase segregation. The reinforced and homogeneous anchorage by multiple repeat phosphonic acid groups onto NiO x significantly optimised the bottom interface, suppressing unfavourable interfacial reactions and thus alleviating phase segregation of WBG perovskite. As a result, the PMDA‐modified WBG PSCs showed higher power conversion efficiency (PCE) than the control device (19.84% vs. 18.18%), along with better device photostability ( T 80 = 1200 vs. 500 h). Coupled with narrow bandgap (NBG) PSCs, the PMDA‐modified PTSCs reached a PCE of up to 28.51% with device operation photostability over 700 h ( T 80 ).