Hybrid sequential processing of mixed Sn-Pb Narrow-Bandgap Perovskite Solar Cells

Abstract

Hybrid vapor-solution sequential deposition of perovskites is a well-established method which enables large area processing of perovskite films and solar cells. In this study, for the first time, we apply the hybrid sequential deposition method to the fabrication of narrow-bandgap mixed Sn-Pb perovskite films. We obtained compact, large-grained perovskite films and power conversion efficiency values exceeding 10% under 1 sun illumination with hole transport material free devices. The applied method eliminates the oxidative degradation risks of solvents during perovskite formation and provides an easiness to develop additive and passivation strategies to improve photovoltaic properties.