biostudies-literatureHu YResearch Grants Council, University Grants CommitteeScience, Technology and Innovation Commission of Shenzhen MunicipalityHong Kong Polytechnic UniversityShenzhen Science and Technology Innovation CommissionInnovation and Technology Commission - Hong Konge19528https://www.ebi.ac.uk/biostudies/studies/S-EPMC12948246biostudies-literatureUnknown13(12)Perovskite and organic semiconductors exhibit analogous properties, including bandgap tunability, low-temperature solution processing, and high potential for lightweight applications. These similarities render them highly attractive for being integrated in multijunction architecture: perovskite-organic tandem solar cells (POTSCs). Nevertheless, the efficiency of POTSCs is limited by electrical losses, which stem from both the wide-bandgap (WBG) perovskite layers and the interconnecting layers (ICLs) between two subcells. These two essential components also constrain the tandem device stability. In this study, the underlying cause of open-circuit voltage (V_OC) losses in WBG perovskites is identified, which is ascribed to the presence of mobile defects distributed at surface regioAdvanced science (Weinheim, Baden-Wurttemberg, Germany)Defect Dynamics and Solution-Processed Interconnects in Perovskite-Organic Tandem Solar Cells.PMC12948246Q‐CDBK1-CDLFU‐CDCC1‐CDJ7C7018-20GMHP/020/23C7018‐20G152213201-BEBB1-CD7XC4005-22Y153079228-8480JCYJ202506041842490641‐BEBB1‐CD7XQ-CDBK1‐CDLFC4005‐22Y8‐8480U-CDCC1-CDJ7Li GYang GJing KHu YLi QYu JBai YZhao YNi ZZhang YChen YZhou FAi ZfalseDefect Dynamics and Solution-Processed Interconnects in Perovskite-Organic Tandem Solar Cells.Perovskite and organic semiconductors exhibit analogous properties, including bandgap tunability, low-temperature solution processing, and high potential for lightweight applications. These similarities render them highly attractive for being integrated in multijunction architecture: perovskite-organic tandem solar cells (POTSCs). Nevertheless, the efficiency of POTSCs is limited by electrical losses, which stem from both the wide-bandgap (WBG) perovskite layers and the interconnecting layers (ICLs) between two subcells. These two essential components also constrain the tandem device stability. In this study, the underlying cause of open-circuit voltage (V_OC) losses in WBG perovskites is identified, which is ascribed to the presence of mobile defects distributed at surface regio2026-01-01T00:00:00Z2026 Feb2026-07-16T22:19:02.341Z2026-07-11T03:12:00.772ZS-EPMC129482464138675910.1002/advs.202519528