Performance enhancement of AgBi2I7 solar cells by modulating a solvent-mediated adduct and tuning remnant BiI3 in one-step crystallization

Abstract

We modulated a solvent-mediated adduct for one-step crystallization of lead-free AgBi₂I₇ at a lower temperature (90 °C) and to obtain remnant BiI₃ by controlling the nature of the substrate and precursor concentration. This eventually resulted in remarkable enhancement in the power conversion efficiency, reaching 2.12%, and the long-term stability of AgBi₂I₇ solar cells towards light, heat and humidity.