Tunable optical absorption in lead-free perovskite-like hybrids by iodide management

Abstract

We present an instructional design strategy to tune the optical absorption ability of organic–inorganic hybrids by managing the internal iodide state. Three bismuth-based hybrids with different internal iodide states were synthesized and display tunable bandgaps from 1.91 eV to 1.87 eV and finally to 1.59 eV.