Perovskite escape room: Which photons leave the film, and which are trapped inside?

Abstract

Although halide perovskite materials hold great promise for optoelectronics, defect-assisted recombination still limits their efficiency. In the April issue of <i>Matter</i>, Fassl et al. present an open-source model for analyzing the photoluminescence spectra of perovskite films, showing a much lower internal quantum efficiency than previously thought in the field.