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Cascade perovskite single crystal for gamma-ray spectroscopy.

Authors :: Wang X
Pan Y
Xu Y
Zhao J
Li Y
Li Q
Chen J
Zhao Z
Zhang X
Bae BS
Onwudiwe DC
Xu X
Lei W
Source :: IScience [iScience] 2023 Sep 20; Vol. 26 (10), pp. 107935. Date of Electronic Publication: 2023 Sep 20 (Print Publication: 2023).
Publication Year :: 2023
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 (MAPbBr <subscript>3</subscript> /MAPbBr <subscript>2.5</subscript> Cl <subscript>0.5</subscript> /MAPbCl <subscript>3</subscript> ) 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 <superscript>-2</superscript> cm <superscript>2</superscript> V <superscript>-1</superscript> . As a result, our gamma-ray PIN photodiodes exhibit compelling response to <superscript>241</superscript> Am, <superscript>137</superscript> Cs, and <superscript>60</superscript> Co; 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.<br />Competing Interests: The authors declare no competing interests.<br /> (© 2023 The Author(s).)