Cascade perovskite single crystal for gamma-ray spectroscopy

• Published in: iScience 2023-10, Vol.26 (10), p.107935-107935, Article 107935
• Main Authors: Wang, Xin, Pan, Yuzhu, Xu, Yubing, Zhao, Jingda, Li, Yuwei, Li, Qing, Chen, Jing, Zhao, Zhiwei, Zhang, Xiaobing, Bae, Byung Seong, Onwudiwe, Damian C., Xu, Xiaobao, Lei, Wei
• Format: Article
• Language: English
• Subjects: Devices; Solid state physics
• ISSN: 2589-0042; 2589-0042
• DOI: 10.1016/j.isci.2023.107935

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/MAPbBr2.5Cl0.5/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. [Display omitted] •Gamma-ray photodiodes made by solution-processed epitaxial growth•Fabrication of ion-formed electrical junctions in perovskite-based devices•Resolving gamma-ray photons based on solution-processed semiconductors Devices; Solid state physics