biostudies-literatureGu XDepartment of Education of Guangdong Province University Innovation FoundationGuangdong Basic and Applied Basic Research FoundationNational Natural Science Foundation of ChinaAustralian Research Councile2200445https://www.ebi.ac.uk/biostudies/studies/S-EPMC9534952biostudies-literatureUnknown9(28)Organic solar cells (OSCs) based on polymer donor and non-fullerene acceptor achieve power conversion efficiency (PCE) more than 19% but their poor absorption below 550 nm restricts the harvesting of high-energy photons. In contrast, wide bandgap all-inorganic perovskites limit the absorption of low-energy photons and cause serious below bandgap loss. Therefore, a 2-terminal (2T) monolithic perovskite/organic tandem solar cell (TSC) incorporating wide bandgap CsPbI₂ Br is demonstrated as front cell absorber and organic PM6:Y6 blend as rear cell absorber, to extend the absorption of OSCs into high-energy photon region. The perovskite sub-cell, featuring a sol-gel prepared ZnO/SnO₂ bilayer electron transporting layer, renders a high open-circuit voltage (V_OC Advanced science (Weinheim, Baden-Wurttemberg, Germany)Organic Solar Cell With Efficiency Over 20% and V_OC Exceeding 2.1 V Enabled by Tandem With All-Inorganic Perovskite and Thermal Annealing-Free Process.PMC95349522021KTSCX107DP210103006621506104962020A1515010916Lai XLi WHe FGu XTan WLZhang YWang TSonar PLiu QKyaw AKKMcNeill CRShan CfalseOrganic Solar Cell With Efficiency Over 20% and V_OC Exceeding 2.1 V Enabled by Tandem With All-Inorganic Perovskite and Thermal Annealing-Free Process.Organic solar cells (OSCs) based on polymer donor and non-fullerene acceptor achieve power conversion efficiency (PCE) more than 19% but their poor absorption below 550 nm restricts the harvesting of high-energy photons. In contrast, wide bandgap all-inorganic perovskites limit the absorption of low-energy photons and cause serious below bandgap loss. Therefore, a 2-terminal (2T) monolithic perovskite/organic tandem solar cell (TSC) incorporating wide bandgap CsPbI₂ Br is demonstrated as front cell absorber and organic PM6:Y6 blend as rear cell absorber, to extend the absorption of OSCs into high-energy photon region. The perovskite sub-cell, featuring a sol-gel prepared ZnO/SnO₂ bilayer electron transporting layer, renders a high open-circuit voltage (V_OC 2022-01-01T00:00:00Z2022 Oct2025-04-05T11:37:57.759Z2025-04-05T11:37:57.759ZS-EPMC95349523587603110.1002/advs.202200445