Guanidinium cation doped (Gua)_x(MA)_(1-x)PbI_3 single crystal for high performance X-ray detector

摘要

Recently, halide hybrid perovskites have emerged as an attractive material for radiation detection due to their high atomic numbers and resistivity, large μτ product (μ is the carrier mobility; τ is the carrier lifetime). However, the sensitivity and stability of perovskite X-ray detectors were limited by ion migration in the perovskites. In this paper, the guanidinium ionic (Gua+) doped MAPbI_3 single crystals were successfully obtained with the solution-processed method. (Gua)_(0.06)(MA)_(0.94)PbI_3 single crystal shows an activation energy of 589 meV. The X-ray detector with Au/(Gua)_(0.06)(MA)_(0.94)PbI_3/Ga structural exhibited a high X-ray sensitivity of 2903 μC Gy_(air)~(-1) cm~(-2) and a low limit of detection of 7.2 nGy_(air)s~(-1). This work shows that a certain amount of Gua~+ doping into MAPbI_3 could inhibit the ion migration, and significantly improve the X-ray detection performance.