Eka Nurfani, Lukman Nulhakim, Dwi Maulidia Muhammad, Monna Rozana, Widi Astuti
In this paper, we study the effect of Mg on the structural, optical, and electrical properties of a ZnO-based photodetector. The sample was prepared by making a ZnO seed layer via spray pyrolysis. Then, the Mg-doped ZnO (MZO) nanorod was deposited on the seed layer via a hydrothermal technique with Mg concentrations of 0 wt% (ZnO), 1 wt% (MZ1), 3 wt% (MZ3), and 5 wt% (MZ5). From X-ray diffraction measurement, all samples show a hexagonal wurtzite structure. The nanorod formation of all samples was confirmed by scanning electron microscope images. Higher Mg dopant increases nanorod size from 872 ± 8 nm (pure ZnO) to 1764 ± 85 nm (5 % Mg). UV–Vis spectroscopy analysis shows that the bandgap generally increases with increased Mg content. Mg doping increases not only photoconductivity but also UV sensitivity by about 6 (ZnO), 46 (MZ1), 69 (MZ3), and 321 (MZ5). Responsivity increases linearly from 0.13 (ZnO) to 73.34 A/W (MZ5), and detectivity also increases linearly from 8.29×108 (ZnO) to 1.56×1011 Jones (MZ5). This study is essential to realize photodetector devices with low-cost fabrication techniques. © 2024 Elsevier B.V.
Department of Materials Engineering, Institut Teknologi Sumatera, Lampung, 35365, Indonesia; Department of Engineering Physics, Institut Teknologi Sumatera, Lampung, 35365, Indonesia; Research Center for Environmental and Clean Technology, National Research and Innovation Agency, Bandung, 40135, Indonesia; Research Center of Mining Technology, National Research and Innovation Agency of Indonesia, Lampung, 35361, Indonesia
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