Heterogeneous FASnI₃ Absorber with Enhanced Electric Field for High-Performance Lead-Free Perovskite Solar Cells.

ABSTRACT: Lead-free tin perovskite solar cells (PSCs) have undergone rapid development in recent years and are regarded as a promising eco-friendly photovoltaic technology. However, a strategy to suppress charge recombination via a built-in electric field inside a tin perovskite crystal is still lacking. In the present study, a formamidinium tin iodide (FASnI₃) perovskite absorber with a vertical Sn²⁺ gradient was fabricated using a Lewis base-assisted recrystallization method to enhance the built-in electric field and minimize the bulk recombination loss inside the tin perovskites. Depth-dependent X-ray photoelectron spectroscopy revealed that the Fermi level upshifts with an increase in Sn²⁺ content from the bottom to the top in this heterogeneous FASnI₃

SUBMITTER: Wu T 

PROVIDER: S-EPMC8993987 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature