Gamma-ray detection using Cs3Cu2I5 perovskite scintillator crystals grown by fast inverse temperature crystallization

초록

Metal-halide perovskite crystals have garnered attention as next-generation, highly efficient radiation detectors across various applications owing to their scintillation properties and competitive optical performance. In this study, we examined the gamma-ray detection performance of a Cs3Cu2I5 single crystal grown within three days using the inverse temperature crystallization method. Formic acid was used to prevent I-and Cu-ion oxidation and thus obtain samples of suitable sizes, cleaned with dimethyl sulfoxide and dimethylformamide to optimize sample conditions, for gamma-ray detection. A 10 x 10 x 6 mm3 Cs3Cu2I5 scintillator sample was wrapped with Teflon tape and coupled to a photomultiplier tube with an optical pad to measure energy spectra. Energy resolutions of 9.2 % and 12.5 % were detected for 137Cs and 22Na radioactive sources, respectively, and optical-performance evaluation revealed transmittances of 76.2 % and 73.3 %, near 440 nm, for two (10 x 10 x 6 and 5 x 5 x 4 mm3, respectively) Cs3Cu2I5 scintillator samples. These results confirm the competitive detection and optical performances of the fabricated scintillator. This study offers promising results and valuable insights for overcoming challenges in future research, including bulk crystal growth of Cs3Cu2I5 through a rapid method for use in high-radiation and high-temperature environments.

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