Performance of Perovskite CsPbBr3 Single Crystal Detector for Gamma-Ray Detection

Abstract

The lead (Pb) halide perovskites show great potential in X- and gamma-ray detection with a high attenuation coefficient, wide band gap energy, and large mobility-lifetime (μt) product. Among them, the all-inorganic cesium lead bromide (CsPbBr3) perovskite offers advantages over the organic-inorganic perovskites owing to its structural stability. We report gamma-ray detectors made of solution-grown perovskite CsPbBr3 single crystal that is able to produce energy spectra from cesium-137 (137Cs), cobalt-57 (57Co) and americium-241 (241Am) sources with a Full-Width-Half-Maximum of 5.5% at 662 keV, 13.1% at 122 keV, and 28.3% at 59.5 keV, respectively. The difference between electron and hole transport properties of CsPbBr3 is demonstrated to have significant effect on detector spectral performance as evidenced by primarily-hole-induced as well as primarily-electron-induced gamma-ray spectra. Electron-hole averaged μt product is evaluated to be 4.0×10-4 cm2 V-1 by fitting the Hecht equation. A Digital Pulse Processing (DPP) algorithm is also developed to process preamplifier pulses with potentially long transit time (on the order of tens of microseconds) in perovskite detectors, which ensures the elimination of ballistic deficit in subsequent pulse processing for distortion-free energy spectra reconstruction.