Abstract
Metal halide perovskites have received great interest in developing scintillator materials. Among various types of perovskites, low dimensional metal halide perovskites have high exciton binding energy and photo-luminescence quantum yield (PLQY), making them suitable for X-ray and \gamma -ray detection. In this work, we report the growth and characterization (structural and optical) of 1-D CsCu 2 I 3 single crystal (SC). The SC was grown using the solvent evaporation method at room temperature. The crystal exhibits an orthorhombic structure with Cmcm space group. The optical characterizations show a yellow photoluminescence (PL) with a large Stoke's shift (~230 nm) that originate from self-trapped exciton (STE) emission. The X-ray photoelectron spectroscopy (XPS) results indicate that the addition of oleic acid (OA) prevents the oxidation of Cu + . Further, we coupled the SC with a silicon photomultiplier (SiPM) to study the scintillation properties. The grown crystal has been characterized for light output, energy resolution, linearity, and non-proportionality. The CsCu 2 I 3 SC grown for this study exhibits a comparable light output of ~20000 ph/MeV to those grown using inverse temperature crystallization (ITC), as reported in the literature. However, the energy resolution reported in this study (11.57% at 662 keV) is better than the values reported for ITC-grown crystals in the literature. GEANT4 simulation toolkit has been used to perform the simulations, and the simulated intrinsic photopeak efficiencies for different volumes of CsCu 2 I 3 scintillator have been obtained and compared with NaI:Tl and bismuth germanate (BGO) scintillators.