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Article Abstract
Solution-grown metal halide perovskite single crystals have been demonstrated as potential gamma-ray spectrometer. However, the energy resolution of the solution-grown formamidinum lead bromide (FAPbBr) single crystal spectrometer still suffers from strong bulk charge recombination. Here, it is identified that the high bulk charge recombination arises from a gradient Type-I band distribution throughout the crystal. This band distribution is attributed to the strong coordination of solvents with FA⁺ cations, which become incorporated into the perovskite lattice during crystal growth. It is selected a solvent that more easily decomplexed with FA, and successfully obtained FAPbBr single crystals without any trapped solvent molecules in the lattices. The FAPbBr single crystals exhibited a tenfold reduction in bulk charge recombination rate, and this enabled the FAPbBr gamma-ray spectrometer to achieve an energy resolution of 1.47 ± 0.05% for 662 keV Cs gamma rays, which is the best among solution-grown semiconductor detectors. The unencapsulated FAPbBr gamma-ray spectrometer exhibited more than three months of operational and storage stability.
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