Cascade perovskite single crystal for gamma-ray spectroscopy

Xin Wang; Yuzhu Pan; Yubing Xu; Jingda Zhao; Yuwei Li; Qing Li; Jing Chen; Zhiwei Zhao; Xiaobing Zhang; Byung Seong Bae; Damian C Onwudiwe; Xiaobao Xu; Wei Lei

doi:10.1016/j.isci.2023.107935

Cascade perovskite single crystal for gamma-ray spectroscopy

iScience. 2023 Sep 20;26(10):107935. doi: 10.1016/j.isci.2023.107935. eCollection 2023 Oct 20.

Authors

Xin Wang¹, Yuzhu Pan¹, Yubing Xu¹, Jingda Zhao¹, Yuwei Li¹, Qing Li¹, Jing Chen¹, Zhiwei Zhao¹, Xiaobing Zhang¹, Byung Seong Bae², Damian C Onwudiwe³, Xiaobao Xu¹, Wei Lei¹

Affiliations

¹ School of Electronic Science and Engineering, Joint International Research Laboratory of Information Display and Visualization, Southeast University, Nanjing, China.
² Department of Electronics &Display Engineering, Hoseo University, Hoseo Ro 79, Asan City, Chungnam 31499, Korea.
³ Department of Chemistry, School of Mathematics and Physical Sciences, Faculty of Natural and Agricultural Sciences, North-West University, Mafikeng Campus, Private Bag X2046, Mmabatho 2735, South Africa.

Abstract

The halide lead perovskite single crystals (HLPSCs) have great potential in gamma-ray detection with high attenuation coefficient, strong defects tolerance, and large mobility-lifetime product. However, mobile halide ions would migrate under high external bias, which would both weaken the gamma-ray response and cause additional noise. Here, we report the gamma-ray PIN photodiodes made of cascade HLPSCs including both ion-formed and electron-hole-formed electrical junctions that could suppress the ions migration and improve the charges collection. Our photodiodes based on cascade HLPSCs (MAPbBr₃/MAPbBr_2.5Cl_0.5/MAPbCl₃) show a wide halide-ion-formed depletion layer of ∼52 μm. The built-in potential along the wide ionic-formed junction ensures a high mobility-lifetime product of 1.1 × 10^-2 cm²V^-1. As a result, our gamma-ray PIN photodiodes exhibit compelling response to ²⁴¹Am, ¹³⁷Cs, and ⁶⁰Co; the energy resolution can reach 9.4%@59.5keV and 5.9%@662keV, respectively. This work provides a new path toward constructing high-performance gamma-ray detectors based on HLPSCs.

Keywords: Devices; Solid state physics.