In(iii)-dictated formation of double Cs2AgxNa1−xFeyIn1−yCl6 perovskites

Abstract

Stable double Cs₂Ag_xNa_1−xFe_yIn_1−yCl₆ (CANFIC) microcrystalline perovskites were produced in air-open conditions. In(III) was found to steer the precursor interaction exclusively towards single-phase solid-solution CANFIC perovskite microcrystals with well-controlled composition, even when present at a small amount (1%). CANFICs revealed sensitivity in the visible range with the lowest bandgap of 1.95 eV found for y = 0.99. Due to a combination of open-environment synthesis conditions, reliable compositional control, the abundant and relatively non-toxic character of constituents, stability, and absorbance in the visible spectral range, CANFIC perovskites show high promises for photovoltaic and photochemical applications.