Sn-Pb Perovskite Solar Cells and Modules with Enhanced Efficiency and Stability

Tin-lead (Sn-Pb) narrow bandgap (NBG) perovskites show great potential in both single-junction and all-perovskite tandem solar cells. Sn-Pb perovskite solar cells (PSCs) are still limited by low charge collection efficiency and poor stability. Compared to Pb-perovskites, their degradation is much faster under operation test, despite that they were shown to pass thermal stability tests. Here I will start with our understanding of the issues that limit the light stability of Sn-Pb perovskites. Then I will present our strategies in enhancing the stability using perovskite material modifications and interfacial engineering. I will also present how to upscale the related tandem cells into minimodules with partial processes done in air.