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Bulk Charge Recombination Reduction Enabled High Spectral Resolution Perovskite Gamma-Ray Spectrometer
Tong Jin1, Shunsheng Yuan1, Hang Yin1
1School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 9, 2025
Summary
Formamidinium lead bromide (FAPbBr3) single crystals show promise as gamma-ray spectrometers. Optimizing solvent choice significantly reduced charge recombination, achieving a record energy resolution for solution-grown detectors.
Area of Science:
- Materials Science
- Crystallography
- Nuclear Instrumentation
Background:
- Solution-grown metal halide perovskite single crystals are explored for gamma-ray spectrometry.
- Formamidinium lead bromide (FAPbBr3) spectrometers face limitations due to bulk charge recombination.
Purpose of the Study:
- To identify the cause of bulk charge recombination in FAPbBr3 single crystals.
- To improve the energy resolution and stability of FAPbBr3 gamma-ray spectrometers.
Main Methods:
- Investigated the relationship between solvent coordination and band distribution in FAPbBr3 crystals.
- Synthesized FAPbBr3 single crystals using a carefully selected solvent with minimal FA+ cation complexation.
- Evaluated the charge recombination rate and energy resolution of the resulting crystals.
Main Results:
- Identified a gradient Type-I band distribution, caused by solvent-cation coordination, as the source of recombination.
- Achieved FAPbBr3 single crystals with no trapped solvent molecules.
- Demonstrated a tenfold reduction in bulk charge recombination rate.
- Attained an energy resolution of 1.47 ± 0.05% for 662 keV gamma rays, the best for solution-grown detectors.
- Showcased over three months of operational and storage stability for unencapsulated detectors.
Conclusions:
- Solvent selection is critical for minimizing charge recombination in solution-grown FAPbBr3 perovskite single crystals.
- The developed FAPbBr3 spectrometers offer superior energy resolution and stability, advancing their potential in radiation detection.
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