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Positive-Negative Photoelectric Effect Induced by the Asymmetric Schottky Interface and Its Application in
1Key Laboratory of Materials Design and Preparation Technology of Hunan Province, School of Materials Science and Engineering, Xiangtan University, Xiangtan411105, Hunan, China.
The Journal of Physical Chemistry Letters
|August 13, 2026
Summary
This study presents a novel heterojunction for self-powered photodetection and synaptic functions. It demonstrates tunable photoelectric responses and polarization sensitivity across a broad infrared spectrum.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Developing advanced materials for optoelectronic devices is crucial.
- Heterojunctions offer unique electronic and optical properties.
- Anisotropic semiconductors and semimetals are promising for novel device architectures.
Purpose of the Study:
- To design and construct a two-dimensional heterojunction for self-powered photodetection and synaptic applications.
- To investigate the device's performance under varying light conditions and voltage regulations.
- To explore the integration of polarization sensitivity and infrared wavelength recognition.
Main Methods:
- Fabrication of an asymmetric Schottky junction using ReS2, graphene (Gr), and PtSe2.
- Characterization of the heterojunction's photovoltaic and photothermal effects.
- Evaluation of synaptic functions (PPF, PPD) and photoelectric response switching.
- Assessment of polarization sensitivity at 1064 nm illumination.
Main Results:
- Achieved self-powered photodetection from 405-1064 nm via dual photovoltaic and photothermal effects.
- Demonstrated tunable, nearly symmetric synaptic pulse modulation and switching photoelectric responses.
- Successfully implemented synaptic functions (PPF, PPD) in the 1064-2200 nm infrared spectrum with low energy consumption (0.35 pJ).
- Exhibited significant polarization sensitivity (polarization ratio of 6.6 at 1064 nm).
Conclusions:
- The designed heterojunction effectively integrates self-powered photodetection, tunable synaptic functions, and polarization sensitivity.
- This work paves the way for advanced infrared detectors and neuromorphic computing devices.
- The dynamic adjustability of photocurrent polarity and wavelength recognition capabilities offer versatile applications.
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