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CH₃NH₃PbBr₃ Perovskite Single-Crystal X-Ray Photon-Counting Detection Based on Multi-Layer Electrodes.

Songchao Wang^1,2, Hanwen Zhang³, Gangyi Chen²

¹National Key Laboratory of Aerospace Mechanism, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

Sensors (Basel, Switzerland)

|May 27, 2026

Summary

Stable electrodes for methylammonium lead tribromide (MAPbBr₃) single crystals were developed for X/γ-ray detection. The Au/Pt/Ti electrode demonstrated Ohmic contact and low dark current, enabling effective X-ray detection and imaging.

Keywords:

CH3NH3PbBr3 single crystal X-ray photon counting detection multi-layer electrode

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Area of Science:

Materials Science
Solid-State Physics
Detector Technology

Background:

Methylammonium lead tribromide (MAPbBr₃) single crystals are promising for X/γ-ray detection.
Developing stable electrodes for MAPbBr₃ remains a significant challenge for device performance.

Purpose of the Study:

To investigate multi-layer electrode structures for MAPbBr₃ single crystals.
To identify electrodes that provide Ohmic contact and low dark current for improved detector sensitivity.

Main Methods:

Fabrication and characterization of multi-layer electrodes (Au, Au/Ti, Au/Pt/Ti).
Current-voltage (I-V) measurements to assess electrical contact behavior.
Kelvin force probe measurements to confirm potential contact.
Performance evaluation using 59.5 keV monochromatic X-ray photon-counting detection and imaging.

Main Results:

The Au/Pt/Ti electrode exhibited Ohmic contact behavior.
Au/Pt/Ti electrodes demonstrated the lowest dark current among the tested configurations.
Successful demonstration of 59.5 keV X-ray photon-counting detection and imaging using the optimized electrodes.

Conclusions:

The Au/Pt/Ti multi-layer electrode is a suitable choice for stable and low-noise X/γ-ray detectors based on MAPbBr₃ single crystals.
This research provides valuable insights for designing electrodes in lead halide perovskite optoelectronic devices.
Optimized electrodes are crucial for advancing the application of perovskite materials in radiation detection.