Narrow-bandgap perovskites using quasi-2D cation engineering

Abstract

The present disclosure relates to a composition that includes a perovskite phase having the stoichiometry ABX 3 and a perovskite-like phase having the stoichiometry A′ 2 A″B′ 2 X′, where A is a first cation, B is a second cation, X is a first anion, A′ is a third cation, A″ is a fourth cation, B′ is a fifth cation, X′ is a second anion, and A′ is different than A″.