Absence of Anomalous Electron-Phonon Coupling in the Near-Ambient Gap Temperature Renormalization of CsPbBr₃ Nanocrystals.

ABSTRACT: Metal halide perovskites exhibit a fairly linear increase of the bandgap with increasing temperature, when crystallized in a tetragonal or cubic phase. In general, both thermal expansion and electron-phonon interaction effects contribute equally to this variation of the gap with temperature. Herein, we have disentangled both contributions in the case of colloidal CsPbBr₃ nanocrystals (NCs) by means of photoluminescence (PL) measurements as a function of temperature (from 80 K to ambient) and hydrostatic pressure (from atmospheric to ca. 1 GPa). At around room temperature, CsPbBr₃ NCs also show a linear increase of the bandgap with temperature with a slope similar to that of the archetypal methylammonium lead iodide (MAPbI₃) perovskite. This is somehow unexp

SUBMITTER: Fasahat S 

PROVIDER: S-EPMC11921149 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature