Radiation-Tolerant Proton Detector Based on the MAPbBr₃ Single Crystal

Abstract

Proton detection has attracted immense interest recently, owing to the increasing demands for applications in physics, medicine, and space. However, the proton detectors suffer from a general problem of performance degradation caused by the proton irradiation-induced defects over long-term operation. Herein, we report a proton detector based on the methylammonium lead tribromide (MAPbBr 3 ) perovskite single crystal, which exhibits remarkable radiation tolerance. The detector can monitor the fluence rate and dose quantitatively up to a high dose of 45 kGy with a fairly low bias electric field (0.01 V μm −1 ). Further increasing the dose to 1 MGy (7.3 × 10 13 p cm −2 ) results in the detector dark current degrading gradually, but the dark current can rapidly recover at room temperature in a few hours after irradiation, showing a desirable self-healing characteristic, which can further enhance the radiation tolerance of the detector. These results show that this perovskite-based proton detector is highly promising for future applications in proton therapy, proton radiography, and so forth.

Chemical Stability of Metal Halide Perovskite Detectors

“…Notably, there appears to b radiation dose threshold (1 MeV, 10 14 p cm −2 ) for this self-healing phenomenon. Recen Huang et al also observed the quick self-healing properties of MAPbBr3 single-crys detectors at room temperature following proton radiation exposure (Figure 3h) [60]. F ther research is necessary to elucidate the underlying mechanisms.…”

“…Copyright 2017 ACS Nano. (h) Dark current recovery times at room temperature after proton irradiation[60]. For details, see ref [60]…”

Direct detection of minimum ionizing charged particles in a perovskite single crystal detector with single particle sensitivity

“…Some years later, α-particles were detected also using a CsPbBr 3 crystal 8 and HC(NH 2 ) 2 PbBr 3 crystals. 9 Huang et al 10 recently reported a radiation tolerant proton detector based on a MAPbBr 3 SC with a thickness of 1 mm. The detector is able to detect 3 MeV proton beams, which are completely stopped in the crystal, from a beam with a fluence between 2.65 × 10 10 cm −2 s −1 and 2.26 × 10 11 cm −2 s −1 .…”