Bimolecular recombination in methylammonium lead triiodide perovskite is an inverse absorption process

• DOI: 10.1038/s41467-017-02670-2
• Publication Date: 2018-01-12T23:48:39Z
• Authors: Christopher L. Da...; Marina R. Filip; Jay B. Patel; Timothy W. Crothers; Carla Verdi; Adam D. Wright; Rebecca L. Milot; Feliciano Giustino; Michael B. Johnston; Laura M. Herz
• Keywords: Triiodide; Lead (geology)

Photovoltaic devices based on metal halide perovskites are rapidly improving in efficiency. Once the Shockley-Queisser limit is reached, charge-carrier extraction will be limited only by radiative bimolecular recombination of electrons with holes. Yet, this fundamental process, and its link material stoichiometry, still poorly understood. Here we show that methylammonium lead triiodide perovskite can fully explained as inverse process absorption. By correctly accounting for contributions to absorption from excitons electron-hole continuum states, able utilise van Roosbroeck-Shockley relation determine rate constants spectra. We sharpening photon, electron hole distribution functions significantly enhances charge temperature lowered, mirroring trends transient spectroscopy. Our findings provide vital understanding band-to-band processes hybrid perovskite, which comprise direct, transitions between thermalized