期刊
APL MATERIALS
卷 9, 期 10, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0067133
关键词
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资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20172010104830]
- National Research Foundation (NRF) of Korea [2020M3H4A3081799, 2018R1D1A1B07048429]
- National Research Foundation of Korea [2020M3H4A3081799, 2018R1D1A1B07048429] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A compact self-powered solar-blind UV-C photodiode was demonstrated using an ultra-wide bandgap alpha-Ga2O3 thin film as a wavelength-selective absorber layer, eliminating the need for low-performance and bulky solar blind UV bandpass filters. The photodetector exhibited excellent responsivity, fast rise/decay characteristics, and solar blindness, making it a promising candidate for the development of a compact and energy-independent next-generation UV-C photodetector.
A compact self-powered solar-blind UV-C photodiode was demonstrated using an ultra-wide bandgap (UWBG) alpha-Ga2O3 thin film as a wavelength-selective absorber layer. The UWBG-based Schottky junction architecture renders the use of low-performance and bulky solarblind UV bandpass filters unnecessary. High-quality alpha-Ga2O3 thin films with a thickness of 1.25 mu mwere grown on a (0001) sapphire substrate via the halide vapor-phase epitaxy technique. The self-powered solar-blind UV-C photodetector based on the Ni/alpha-Ga2O3 Schottky junction exhibited excellent responsivity (1.17 x 10(-4) A/W), photo-to-dark current ratio (1.12 x 105), and reproducibility, as well as fast rise/decay characteristics without persistent photoconductivity upon exposure to UV-C radiation (254 nm wavelength). The relationship between light intensity (I) and photocurrent (P) was modeled by I x P-0.69, indicating the high-quality of the halide vapor-phase epitaxy-grown alpha-Ga2O3 thin film. Upon exposure to natural sunlight, the fabricated solar-blind photodetector showed excellent solar blindness with sensitivity to UV-C radiation and did not require an external power source. Therefore, this UWBG alpha-Ga2O3 thin-film Schottky barrier photodiode is expected to facilitate the development of a compact and energy-independent next-generation UV-C photodetector with solar blindness. (C) 2021 Author(s).
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