Ion Migration Controlled Stability in α-Particle Response of CsPbBr<sub>2.4</sub>Cl<sub>0.6</sub> Detectors
Binbin Zhang, Fangbao Wang, Xin Liu, Bao Xiao, Meng Xu, Songtao Dong, Yadong Xu, P.J. Sellin, Wanqi Jie
Abstract
Halide perovskites have been considered as nuclear radiation detection materials due to their high mobility, long carrier lifetime, and high absorption coefficient. However, it has been reported that the ion migration increases the dark current of halide perovskite detectors and hinders the stable response to high energy photons or particles. In this work, we report the utilization of the “voltage cycling” technique to obtain the stable α-particle spectra in a CsPbBr2.4Cl0.6 device. Also, by measuring the time-dependent stability and the effect of electric field strength, we can gain insight into the phenomona causing instability in these devices. Accordingly, the influence of ion migration on the charge transport properties and energy spectra in CsPbBr2.4Cl0.6 detectors was also revealed. Our investigation demonstrates the strong correlation between ion migration processes and stable energy spectra in halide perovskite materials.