A bulk Schottky junction for high-sensitivity portable radiation detectors
Yihan Zhang, Zongming Huang, Chen‐Chen Peng, Ning Gao, Xie George Xu, Yaping Li, Chenghang Zheng, Wenjing Chen, Yidong Yang, Jingjing Zhao, Junjie Yang, Tao Chen, Zhengguo Xiao
Abstract
The thickness of X-ray detectors needs to reach hundreds of micrometers to absorb X-ray, and therefore, high voltages over tens or hundreds of volts should be applied to extract X-ray-generated carriers. Here, we propose a bulk Schottky junction for X-ray detection using interpenetrated macroporous-carbon electrodes and metal-halide perovskite networks. The X-ray-generated holes are extracted by the macroporous-carbon electrodes under the built-in electric field, while the electrons in the perovskite phase result in a high gain effect. A high sensitivity of 1.42×105 μC Gyair−1 cm−2 and a low detection limit of 48 nGyair s−1 at a low voltage of −1 V are achieved. We fabricated a dry battery-powered portable X-ray alarm prototype. The pixel detector shows a decent stability under X-ray exposure, and a spatial resolution of up to 5.0 lp mm−1, and the detector arrays also exhibit remarkable uniformity, demonstrating its potential application in X-ray imaging. Zhang et al. report a bulky Schottky junction constructed by interpenetrated macroporous-carbon electrode for hole extraction and perovskite network for electron trapping under X-ray irradiation. The efficient extraction of carriers enables a dry battery-powered portable X-ray radiation alarm.