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Self-powered perovskite photon-counting detectors.

Ying Zhou1, Chengbin Fei1, Md Aslam Uddin1

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This summary is machine-generated.

Metal-halide perovskites (MHPs) enable self-powered photon counting detectors that rival silicon photomultipliers. Optimizing shallow traps improves performance, reducing dark count rates for sensitive weak light detection.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Photonics

Background:

  • Metal-halide perovskites (MHPs) are established materials for optoelectronic devices like solar cells and LEDs, typically under strong light conditions.
  • Current photon counting technologies, such as silicon photomultipliers (SiPMs), have limitations in sensitivity and operating conditions.

Purpose of the Study:

  • To investigate the potential of self-powered polycrystalline perovskite photodetectors for photon counting applications.
  • To identify and mitigate factors limiting the photon-counting performance of perovskite devices.

Main Methods:

  • Characterization of shallow trap states in polycrystalline methylammonium lead triiodide perovskites.
  • Strategies for trap reduction, including grain-size enhancement and surface passivation with diphenyl sulfide.
  • Performance evaluation of perovskite photon-counting detectors (PCDs) against commercial silicon photomultipliers (SiPMs).

Main Results:

  • Identified two key shallow traps (5.8 meV and 57.2 meV) at grain boundaries and surfaces, respectively.
  • Reduced dark count rate (DCR) from over 20,000 cps/mm² to 2 cps/mm² at room temperature via trap mitigation.
  • Achieved superior weak light response compared to SiPMs, better gamma-ray spectral resolution, and stable high-temperature performance (up to 85°C).

Conclusions:

  • Perovskite photon-counting detectors (PCDs) offer a competitive alternative to SiPMs, particularly for weak light detection.
  • Exploiting unique defect properties, specifically shallow traps, is crucial for advancing perovskite-based photon counting.
  • Zero-bias operation ensures stable noise and detection properties, opening new avenues for perovskite applications.