Charge Carrier Relaxation in Colloidal FAPbI3 Nanostructures Using Global Analysis.

ABSTRACT: We study the hot charge carrier relaxation process in weakly confined hybrid lead iodide perovskite colloidal nanostructures, FAPbI3 (FA = formaminidium), using femtosecond transient absorption (TA). We compare the conventional analysis method based on the extraction of the carrier temperature (Tc) by fitting the high-energy tail of the band-edge bleach with a global analysis method modeling the continuous evolution of the spectral lineshape in time using a simple sequential kinetic model. This practical approach results in a more accurate way to determine the charge carrier relaxation dynamics. At high excitation fluence (density of charge carriers above 1018 cm-3), the cooling time increases up to almost 1 ps in thick nanoplates (NPs) and cubic nanocrystals (NCs), indicating the hot phon

SUBMITTER: Franco CV 

PROVIDER: S-EPMC7598295 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature