Ultrafast transient infrared spectroscopy for probing trapping states in hybrid perovskite films.

ABSTRACT: Studying the charge dynamics of perovskite materials is a crucial step to understand the outstanding performance of these materials in various fields. Herein, we utilize transient absorption in the mid-infrared region, where solely electron signatures in the conduction bands are monitored without external contributions from other dynamical species. Within the measured range of 4000 nm to 6000 nm (2500-1666 cm^-1), the recombination and the trapping processes of the excited carriers could be easily monitored. Moreover, we reveal that within this spectral region the trapping process could be distinguished from recombination process, in which the iodide-based films show more tendencies to trap the excited electrons in comparison to the bromide-based derivatives. The trapping process

SUBMITTER: El-Zohry AM 

PROVIDER: S-EPMC9814551 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature