Resolving Ultrafast Carrier-to-Exciton Conversion in CsPbBr3 Nanocrystals Formed from Solid-State Photochemistry
Year: 2026
Type: preprint
Abstract: Photoinduced conversion provides an alternative pathway to form CsPbBr3 nanocrystals from their twodimensional analogues, nanoplatelets, using optical excitation in the solid phase. Although this transformation has been previously observed, it is unclear how the ultrafast dynamics of excitons in the resulting nanocrystals compare with those of CsPbBr3 nanocrystals synthesized in solution. In this study, we used femtosecond pump-probe spectroscopy to monitor the photoinduced conversion of n = 2 CsPbBr3 nanoplatelets in real time and investigate the charge carrier dynamics of the resulting nanocrystals. To investigate the processes that dominate the excited-state dynamics, we performed excitation-density-dependent pump-probe measurements and analyzed the transient kinetics using singular value decomposition methods. From this analysis, we identified two characteristic decay associated spectra connected to charge carrier cooling following photoexcitation. Comparison of these spectra with literature reports indicates that nanocrystals generated through photoinduced conversion exhibited carrier relaxation pathways similar to those of CsPbBr3 nanocrystals prepared by conventional colloidal synthesis. Our results provide insight into the ultrafast photophysics of photoinduced CsPbBr3 nanocrystals and established a connection between their formation through photoinduced conversion in the solid-state and the excited-state dynamics of similar materials synthesized through conventional solution-phase methods.
Source: ChemRxiv
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7223186882