High energy resolution CsPbBr₃ alpha particle detector with a full-customized readout application specific integrated...

α particles must be monitored to be managed as radioactive diagnostic agents or nuclear activity indicators. The new generation of perovskite detectors suffer from limited energy resolution, which affects spectroscopy and imaging applications. Here, we report that the solution-grown CsPbBr₃ crystal exhibits a low and stable dark current (34.6 nA·cm^-2 at 200 V) by thinning the as-grown crystal to decrease the high concentration CsPb₂Br₅ phase near the surface. The introduction of the Schottky electrode for the CsPbBr₃ detector further reduces the dark current and improves the high-temperature stability. An energy resolution of 6.9% is achieved with the commercial electronic system, while the effects of air scattering and absorption are investigated. Moreover, 1.1% energy resolution is recognized by a full-customized readout application-specific integrated circuit without any additional signal processing, which matches well with the given parameters of the CsPbBr₃ detector by reducing the parasitic capacitance and electronic noise.