New insights into exciton binding and relaxation from high time resolution ultrafast spectroscopy of CH₃NH₃PbI₃and CH₃NH₃PbBr₃films

Abstract

High time resolution broadband pump-probe experiments on CH₃NH₃PbI₃and CH₃NH₃PbBr₃films show that interband and exciton transitions are essential to understanding transient spectra, which reflect exciton binding energies of 20–30 meV in both materials.