Enhancement of CsPbBr3 detectors spectral performance for gamma-ray detection using simultaneous multi-waveform clustering method

As a room-temperature semiconductor detector, all-inorganic Proveskit CsPbBr 3 (CPB) has great potential for gamma-ray detection and spectroscopy. However, most CPB samples suffer from spatially non-uniform responses, leading to variations in charge collection efficiency (CCE) for the identical deposited energy at different locations within the detector. This issue affects the apparent energy resolution of the detector. Therefore, the development of methods for correcting non-uniform CCE would be beneficial. In this paper, we have explored a simultaneous multi-waveform clustering method to classify different interaction patterns and derive the variation of CCE accordingly. This information is then used to correct the energy spectrum and enhance the energy resolution. Our results showed that by using this method, we can significantly improve the detector's energy resolution from 11.5 % at 122 keV to 4.4 % after the correction. The main advantage of our approach is that we can improve the spectral performance of a detector regardless of detector configuration and the sources of variations in CCE. Since the proposed method is based on waveform analysis, it could be effectively applied to other room-tempreature semiconductor detectors, such as CZTs.