Study on persistent photoconductivity in amorphous Ga2O3 photodetectors

Haixin Zhang; Dayong Jiang; Man Zhao; Jichao Han; Mingyang Li; Yue Zhao; Haoda Li; Yanyan Peng

doi:10.1117/12.2687010

6 August 2023 Study on persistent photoconductivity in amorphous Ga₂O₃ photodetectors

Haixin Zhang, Dayong Jiang, Man Zhao, Jichao Han, Mingyang Li, Yue Zhao, Haoda Li, Yanyan Peng

Proceedings Volume 12781, International Conference on Optoelectronic Information and Functional Materials (OIFM 2023); 127810M (2023) https://doi.org/10.1117/12.2687010
Event: 2023 International Conference on Optoelectronic Information and Functional Materials (OIFM 2023), 2023, Guangzhou, JS, China

Abstract

Ga₂O₃ is one of the hot materials used in the preparation of solar blind ultraviolet detectors in recent years because of its wide band gap of 4.8 eV, high optical absorption coefficient, good thermal and chemical stability, strong anti-irradiation ability and low cost. Among them, amorphous Ga₂O₃ materials not only have the same photoelectric characteristics as single crystalline Ga₂O₃ materials, but also have the unique advantages of easy growth, easy preparation and low substrate requirements. The introduction of oxygen vacancy in Ga₂O₃ can produce intermediate energy level in its forbidden band, so that Ga₂O₃ has the ability of wide band detection from ultraviolet to visible. However, in photoconductive Ga₂O₃ photodetectors, there exists a contradictory relationship between responsiveness and response recovery speed, which is mainly attributed to the fact that photoconductive gain and sustained photoconductivity related to defects increase responsiveness and response recovery time, respectively. In addition, the mechanism of photoconductance gain and sustained photoconductance formation needs further clarification. In this paper, amorphous Ga₂O₃ photodetectors with good performance were prepared and the mechanism of continuous photoconductance in Ga₂O₃ photodetectors was investigated.

Citation Download Citation

Haixin Zhang, Dayong Jiang, Man Zhao, Jichao Han, Mingyang Li, Yue Zhao, Haoda Li, and Yanyan Peng "Study on persistent photoconductivity in amorphous Ga₂O₃ photodetectors", Proc. SPIE 12781, International Conference on Optoelectronic Information and Functional Materials (OIFM 2023), 127810M (6 August 2023); https://doi.org/10.1117/12.2687010

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KEYWORDS

Gallium

Photodetectors

Electrons

Ultraviolet radiation

Oxygen

Semiconductors

Spectral response

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