Temperature-Dependent Self-Powered Solar-Blind Photodetector Based on Ag2O/β-Ga2O3 Heterojunction
Taejun Park1, Sangbin Park1, Joon Hui Park2
1Department of Electrical Engineering, College of IT Convergence, Gachon University, 1342, Seongnam-daero, Sujeong-gu, Seongnam-si 13120, Korea.
Nanomaterials (Basel, Switzerland)
|September 9, 2022
Summary
Researchers developed a self-powered deep ultraviolet (DUV) photodetector using Ag2O/β-Ga2O3. This novel device demonstrates high photo-responsivity and operates without external voltage, enhancing ultraviolet sensing systems.
Area of Science:
- Materials Science
- Optoelectronics
- Semiconductor Physics
Background:
- Deep ultraviolet (DUV) photodetectors are crucial for various applications, including flame detection and environmental monitoring.
- Developing self-powered devices with high performance is a key challenge in optoelectronics.
Purpose of the Study:
- To fabricate and characterize a novel Ag2O/β-Ga2O3 heterojunction photodetector.
- To investigate the effect of post-annealing on device performance.
- To evaluate the self-powered capabilities and key performance metrics of the DUV photodetector.
Main Methods:
- Fabrication of a p-type Ag2O thin film on an n-type β-Ga2O3 layer to create a heterojunction.
- Post-annealing the device at temperatures ranging from 0 to 400 °C.
- Characterization of device electrical and photoelectrical properties, including current-voltage (I-V) measurements and responsivity under DUV illumination.
Main Results:
- The Ag2O/β-Ga2O3 heterojunction exhibited typical rectification characteristics.
- Optimal performance was achieved after post-annealing at 300 °C, yielding a low leakage current (4.24 × 10^-11 A), ideality factor (2.08), and barrier height (1.12 eV).
- The self-powered photodetector achieved high photo-responsivity (12.87 mA/W), detectivity (2.70 × 10^11 Jones), and fast response times (rise/fall: 29.76/46.73 ms) at 254 nm and zero bias.
Conclusions:
- The fabricated Ag2O/β-Ga2O3 heterojunction photodetector operates efficiently as a self-powered device.
- Post-annealing is critical for optimizing the performance of these DUV photodetectors.
- The high performance of this device offers significant potential for advancing ultraviolet sensing technologies.
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