An ultrafast x-ray photoelectric detector using CsPbI2Br perovskite film

Abstract

Metal halide perovskites have attracted worldwide attention in the field of x-ray detection due to their effective light absorption, excellent optoelectronic yield, high charge carrier mobility, and facile solution-processed preparation. Most of the current metal halide perovskite x-ray detectors rely on photoconductive or photovoltaic effects. In this work, we use CsPbI2Br perovskite films to demonstrate an ultrafast x-ray detector based on the photoelectric effect. The photoelectric effect allows the detector to exhibit a temporal resolution of 170 ps and an ultra-low dark current (10−5–10−3 pA), and the temporal response is the fastest among the reported perovskite x-ray detectors. The detector also exhibits a detectivity of 1.28 × 1010 Jones and a noise equivalent power of 6.95 × 10−11 W Hz−1/2. This ultrafast x-ray photoelectric detector has been utilized to diagnose x-ray flux in inertial confinement fusion experiments.