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Ultraviolet photodetector fabricated using laser sintering method grown Mg0.2Zn0.8O film

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Abstract

The Mg0.2Zn0.8O thin films were prepared on quartz substrate by laser sintering method. The effects of laser power density and irradiation time on the film structure and photoelectric properties were studied. Through XRD, SEM, and absorption spectrum test analysis, the optimal sintering technology parameters were determined. The laser power density and the laser irradiation time were determined as 53 W cm−2 and 30 s. The optimal thin film was used to prepare the MSM structure UV detector. Current–Voltage (I–V) curves were obtained under dark and ultraviolet illumination conditions, and the curves show obvious Schottky contact behavior. Ideality factor, barrier height, and saturation current density were calculated as 1.38, 0.44 eV, and 1.21*10–4 A cm−2. The detector exhibits the low dark current (4 nA at 20 V), high photocurrent-to-dark current ratio of 104. Correspondingly, the detectivity (D*) of 4.42 × 1012 cm Hz1/2 W−1 (Jones) and linear dynamic range of ~ 64 dB are also achieved. Above results show that the device has a larger photocurrent-to-dark current ratio and a strong ability for characterizing the signal-to-noise ratio, which makes it has the detection capacity even in weak UV environments.

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Acknowledgments

The authors are grateful for the financial support from the China Scholarship Council (CSCNO.201407585006).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130012, Jilin, China

    Hongbin Wang, Quansheng Liu, Xiaochun Wang, Jiangbing Yan & He Tang

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  1. Hongbin Wang
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Correspondence to Quansheng Liu.

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Wang, H., Liu, Q., Wang, X. et al. Ultraviolet photodetector fabricated using laser sintering method grown Mg0.2Zn0.8O film. J Mater Sci: Mater Electron 31, 15659–15668 (2020). https://doi.org/10.1007/s10854-020-04130-y

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