研究目的
Investigating the recombination mechanism of photogenerated charge carriers in bulk CsPbBr3 using time-resolved photoluminescence spectroscopy.
研究成果
The study revealed that the recombination of photogenerated species in CsPbBr3 is dominated by efficient radiative processes involving excitons, with exciton-exciton annihilation becoming prominent at high excitation intensities. The findings provide fundamental insights into the carrier dynamics in CsPbBr3, essential for its application in radiation detection and optoelectronic devices.
研究不足
The study is limited to bulk CsPbBr3 single crystals at low temperatures. The effects of carrier diffusion were not considered in the analysis.
1：Experimental Design and Method Selection:
Time-resolved photoluminescence (TR-PL) spectroscopy was used to investigate the recombination mechanism at low temperature and various laser excitation powers. A dynamic recombination model was proposed to describe the TR-PL.
2：Sample Selection and Data Sources:
Bulk CsPbBr3 single crystals were synthesized via a solid-state reaction and grown using Bridgman methods. Steady-state and time-resolved PL spectra were measured.
3：List of Experimental Equipment and Materials:
A 405-nm line from a cw semiconductor diode laser (OBIS laser), a 500M SPEX grating monochromator, a Hamamatsu photomultiplier tube (R928 PMT), and a cryostat with a temperature controller.
4：Experimental Procedures and Operational Workflow:
The CsPbBr3 crystal was illuminated with 405-nm light pulses operated at 20 Hz. The pulse width was kept at 1 μs and the spot size is 1 mm2. Excitation intensities were adjusted using optical density filters.
5：Excitation intensities were adjusted using optical density filters.
Data Analysis Methods:
5. Data Analysis Methods: The time-dependent normalized PL intensity was analyzed using a dynamic kinetic model to separate the monomolecular and bimolecular recombination contributions.
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