Role of Self-Trapped Excitons in the Broadband Emission of Lead-Free Perovskite-Inspired Cu₂AgBiI₆.

ABSTRACT: The perovskite-inspired Cu₂AgBiI₆ (CABI) absorber shows promise for low-toxicity indoor photovoltaics. However, the carrier self-trapping in this material limits its photovoltaic performance. Herein, we examine the self-trapping mechanism in CABI by analyzing the excited-state dynamics of its absorption band at 425 nm, which is responsible for the self-trapped exciton emission, using a combination of photoluminescence and ultrafast transient absorption spectroscopies. Photoexcitation in CABI rapidly generates charge carriers in the silver iodide lattice sites, which localize into the self-trapped states and luminesce. Furthermore, a Cu-Ag-I-rich phase that exhibits similar spectral responses as CABI is synthesized, and a comprehensive structural and photophysical stud

SUBMITTER: Grandhi GK 

PROVIDER: S-EPMC10184165 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature