Mr. Youcai Chen Profile

Youcai Chen

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Proceedings Article | 1 February 2024 Paper

Performance enhancement of amorphous Ga2O3 solar-blind photodetector by chemically etched surface textures

Changqi Zhou, Yunsong Feng, Wei Jin, Youcai Chen, Yuan Lu

Proceedings Volume 13068, 1306821 (2024) https://doi.org/10.1117/12.3016326

KEYWORDS: Photodetectors, Photocurrent, Spectral response, Oxygen, Gallium, Ultraviolet detectors

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We have demonstrated the fast-speed solar-blind ultraviolet (UV) photodetectors based on amorphous Ga₂O₃ (a-Ga₂O₃) films grown by RF magnetron sputtering. The effect of acid treatment on the performance of a-Ga₂O₃ photodetectors has been investigated in detail. The response speed of the H₂SO₄-treated photodetector is faster than that of the as-grown photodetector, accompanied by a slight decrease in photocurrent. While the responsivity and UV/visible rejection ratio (R250nm/R400nm) of HCl treated photodetector have been significantly improved compared with as-grown photodetector without sacrificing response speed, owing to the groove textures on a-Ga₂O₃ surface etched by HCl, which enhances the absorption of solar-blind UV light in the near surface area of the photodetector. This provides a feasible method for exploring and improving the performance of amorphous gallium oxide ultraviolet detectors.

Proceedings Article | 20 January 2023 Paper

Temperature field of the skin irradiated by the xenon lamp

Wei Jin, Yunsong Feng, Jin Wang, Youcai Chen

Proceedings Volume 12555, 125550B (2023) https://doi.org/10.1117/12.2651513

KEYWORDS: Skin, Lamps, Xenon, Temperature metrology, Tissues, Thermal effects, Ultraviolet radiation, Solids, Mid-IR, Light

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The radiation spectrum of the xenon lamp ranges from ultraviolet to mid-infrared. When the skin is irradiatedbythexenon lamp, the skin temperature will change due to the absorption of the radiation. In order to evaluate whether theskintissue will be damaged when the human body is irradiated with a xenon lamp, it is necessary to obtain the temperaturefield of the skin irradiated by the xenon lamp.In this paper, two methods of numerical calculation and thermal effect test were used to compare and study the instantaneous temperature field of the skin irradiated by a 10Kw xenon lamp.Firstly, the three-layer structure model of human skin tissue was analyzed. Secondly, the heat transfer process of theskinirradiated by the xenon lamp was studied, and the instantaneous temperature field model was established. Thirdly, athermal effect test device was built, and the human skin tissue was replaced by the isolated pigskin tissue. In anindoorenvironment, the experiment of irradiating the pigskin tissue with a xenon lamp was carried out, and the temperatureofseveral positions of the pigskin tissue at different irradiation time was recorded by contact temperature measurement. Finally, using the Heat Transfer in Solids Module in COMSOL Multiphysics 5.5 software, the 3D transient temperaturefield of the skin was solved. The results of experimental test and numerical calculation were compared and analyzed. At the same irradiation time, the numerically calculating temperature value was higher than the experimental test value. Themean value of the absolute error between the numerically calculating temperature value and the experimental test valuewas 6.0°C, and the mean value of the relative error was 14%. The research results provide a scientific basis for thesafeuse of the xenon lamp.

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