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Updated: Jul 13, 2025
11:32
High Pressure Single Crystal Diffraction at PX^2
Published on: January 16, 2017
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Cascade perovskite single crystal for gamma-ray spectroscopy
Xin Wang1, Yuzhu Pan1, Yubing Xu1
1School of Electronic Science and Engineering, Joint International Research Laboratory of Information Display and Visualization, Southeast University, Nanjing, China.
Iscience
|October 16, 2023
Summary
We developed novel cascade halide lead perovskite single crystal (HLPSC) PIN photodiodes for gamma-ray detection. These detectors suppress ion migration, enhancing performance and enabling superior gamma-ray response and energy resolution.
Area of Science:
- Materials Science
- Nuclear Instrumentation
- Solid-State Physics
Background:
- Halide lead perovskite single crystals (HLPSCs) show promise for gamma-ray detection due to high attenuation and defect tolerance.
- Mobile halide ions in HLPSCs migrate under bias, degrading detector performance and increasing noise.
Purpose of the Study:
- To engineer HLPSC-based gamma-ray PIN photodiodes that mitigate ion migration.
- To improve charge collection efficiency and overall detector performance.
Main Methods:
- Fabrication of cascade HLPSCs (MAPbBr3/MAPbBr2.5Cl0.5/MAPbCl3) to form ion- and electron-hole-formed electrical junctions.
- Characterization of the depletion layer width and mobility-lifetime product.
- Testing detector response to gamma-ray sources (241Am, 137Cs, 60Co).
Main Results:
- A wide halide-ion-formed depletion layer of approximately 52 μm was achieved.
- A high mobility-lifetime product of 1.1 × 10-2 cm2V-1 was obtained.
- Excellent energy resolution was demonstrated: 9.4% at 59.5 keV and 5.9% at 662 keV.
Conclusions:
- Cascade HLPSC PIN photodiodes effectively suppress ion migration, enhancing gamma-ray detection capabilities.
- This approach offers a new pathway for developing high-performance HLPSC-based gamma-ray detectors.
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