Interfacial modification of perovskite solar cells via Cs2CO3: Computational and experimental approach

Interfacial materials in perovskite solar cells (PSCs) between the absorber layer and charge selective layers are stimulants to boost performance stability. Incorporation of a low-temperature processed passivating agent at electron layer/perovskite interface can enhance PSCs; however, SnO2/(FAPbI3)0.85(MAPbBr3)0.15 suffers from surface phenomena that retard overall PSCs. By adopting synergistic approach, drift–diffusion simulation, experimental validation, we unravel interaction passivation layer/perovskite. Firstly, elucidated impact defect density (Nt) conduction band SnO2 using simulation yield power conversion efficiency 23.18 %. Secondly, validate trend experimentally by depositing Cs2CO3 on top layer. The electro-optical properties, collection, recombination rate interfaces PSCs was unraveled. PSC fabricated with treatment achieves higher open-circuit voltage, Voc ∼ 1090 mV. Our findings put forward combinatorial protocol studies address interfacial issues