Acceleration of Carrier Transport in an Individual Microplate of Mixed-Halide Perovskite after Phase Segregation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40568890.
- Also identified by DOI 10.1021/acsnano.5c07733.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The band gap energy of lead mixed bromide-iodide perovskite can be simply tuned by adjusting the ratio between the composing halide anions, which would be segregated again upon continuous light illumination to form the iodide-rich domains. Here, we have employed transient absorption microscopy to investigate the carrier diffusion dynamics in an individual CsPbBr<sub>1.5</sub>I<sub>1.5</sub> microplate under the influence of such iodide-rich domains. As expected in the phase-segregated microplate, the lifetime of charge carriers is shortened owing to their migration into the iodide-rich domains with a low band gap energy. Surprisingly, the diffusion coefficient of charge carriers is significantly increased in the phase-segregated microplate, signifying their effective acceleration by the iodide-rich domains according to our Green's function simulations. The above findings have advanced the understanding of the carrier diffusion dynamics in mixed-halide perovskites, which would facilitate their potential applications in various optoelectronic devices such as solar cells and photodetectors.