Gamma-ray Spectra from a 3x3 CsPbBr3 Array

CsPbBr
3
is a promising semiconductor material for X-and ℽ-ray detection at room temperature due to a wide bandgap of 2.3 eV, high stopping power, and relatively high mobility-lifetime products of electrons and holes, and the capability of growing large crystals. In this paper we report on fabrication and testing of a 3.8 mm thick, 3 × 3 array with 1.25 mm pitch. Raw
¹³⁷
Cs spectra were acquired with applied bias of 400 V, 500 V, and 600 V. Energy resolution of between 2 and 3 % FWHM at 662 keV was obtained from most pixels without any correction at room temperature. After 29 days under continuous bias at 600 V, no polarization effects were observed.