In- and Ga-based inorganic double perovskites with direct bandgaps for photovoltaic applications

Double perovskites in the form of A 2 B′B′′X 6 (A = Cs, B′ = Cu, Ag, Au, B′′ = In, Ga, X = Cl, Br, I) are examined for photovoltaic applications. Only Cs 2 AgInBr 6 is predicted to be thermodynamically stable with a direct band gap in the range of 0.9–1.6 eV.