Performance enhancement of fiber-optic ultraviolet photodetector based on Ag/ZnO-microrod Schottky junction

Dingbang Ma; Ying Wang; Yiping Wang

doi:10.1117/12.2666501

4 April 2023 Performance enhancement of fiber-optic ultraviolet photodetector based on Ag/ZnO-microrod Schottky junction

Dingbang Ma, Ying Wang, Yiping Wang

Author Affiliations +

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 126175D (2023) https://doi.org/10.1117/12.2666501
Event: Ninth Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

In this work, an all-fiber ultraviolet (UV) photodetector is proposed, where a ZnO micro-rod prepared by chemical vapor deposition is fixed on the end face of a fiber-tip and acts as a Fabry-Pérot interferometer (FPI). Under the irradiation of UV light, the photo-generated carriers change the refractive index of the ZnO micro-rod, resulting in a redshift of the interference wavelengths of the ZnO FPI. Through tracing the shift of a single interference peak, the relative intensity of UV light can be obtained. In order to improve the sensitivity of the device, a discontinuous Ag film with an island-like structure is coated on the surface of the ZnO micro-rod through magnetron sputtering, and therefore the sensitivity of the proposed device achieves a UV sensitivity up to 0.55 nm/(W·cm-2 ), which is 1.9 times higher than that of without Ag-decoration, due to the intensification of photo-carrier change with the help of the Schottky junction formed between Ag film and ZnO micro-rod. The demonstrated structure exhibits excellent stability and UV response and takes full advantage of optical fiber devices, which paves a new way for the next generation of UV photodetection applications.

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Dingbang Ma, Ying Wang, and Yiping Wang "Performance enhancement of fiber-optic ultraviolet photodetector based on Ag/ZnO-microrod Schottky junction", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 126175D (4 April 2023); https://doi.org/10.1117/12.2666501

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KEYWORDS

Zinc oxide

Ultraviolet radiation

Fiber optics

Silver

Photodetectors

Optical fibers

Fiber optics tests

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