Facilitating the Carrier Transport Kinetics at the CsPbBr 3 /Carbon Interface through SbX 3 (X = Cl, Br, I) Passivation.
Wenwen LiuTeng ZhangBaohua ZhaoChengben LiuYouru BaiZhi LiShihui ZhuTailin WangXinyu SunHeyuan LiuZhaobin LiuYanli ChenXi-You LiPublished in: ACS applied materials & interfaces (2022)
The nonradiative carrier recombination at the perovskite/carrier selective layer (CSL) interface was accounted for the inferior power conversion efficiency (PCE) of perovskite solar cells (PSCs), especially rigid all-inorganic perovskite (CsPbI 3 and CsPbBr 3 ). In this study, targeting the poor interface, we introduce SbX 3 (X = Cl, Br, I) surface passivation at the CsPbBr 3 /carbon interface. Smoothed compressive strain, reduced defect density, and enhanced energy-level alignment were achieved simultaneously, facilitating carrier extraction at the selective interface. With the simple aqueous solution-based two-step process, the PCE of our SbI 3 passivated carbon-based CsPbBr 3 PSCs has increased from 7.81% (without passivation) to 9.69%, a ∼25% enhancement. Specifically, V oc (1.657 V) of the SbI 3 -passivated cells was much higher than that of the control ones (1.488 V), confirming the ameliorated interface. Finally, our unencapsulated SbI 3 passivated devices maintain 90% of their initial PCEs while left in the air for 30 days with a relative humidity of 60%. To conclude, we present an interfacial carrier extraction-enhanced strategy for preparing high-performance and stable CsPbBr 3 -based PSCs.