Multiscale Dynamics from Picoseconds to Milliseconds: Bridging Spin Coherence and Metastable Photocharging in CsPbX<sub>3</sub> Perovskite Quantum Dots.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40720371.
- Also identified by DOI 10.1021/acs.nanolett.5c02414.
- 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
All-inorganic lead halide perovskite quantum dots (PQDs) have attracted significant attention due to their exceptional optoelectronic properties and unique spin-related behaviors. This study investigates the interplay between hole spin coherence and photocharging processes in solution-processed CsPbCl<sub>3</sub> PQDs by using time-resolved Faraday rotation spectroscopy. Our research reveals a room-temperature hole spin dephasing time of ∼60 ps and a hole <i>g</i> factor of ∼1.73. Photocharging dynamics are probed via a spin detection technique based on a prepump-pump-probe methodology, uncovering biphasic formation kinetics with time constants of 54 and 327 ps and three lifetimes of 62 μs, 335 μs, and >1 ms for the photocharged states. These multiscale dynamics are similarly observed in CsPbBr<sub>3</sub> PQDs. This study provides a quantitative framework linking spin coherence to photocharging processes, deepening the understanding of spin-charge correlations in lead halide perovskites, and offering practical guidelines for optimizing quantum coherence in solution-processed nanomaterials.