E. Nurfani, W.A.P. Kesuma, A. Lailani, M.S. Anrokhi, G.T.M. Kadja, M. Rozana, W.S. Sipahutar, M.F. Arif
We have investigated structural, optical, and electrical properties of ZnO:Cu films deposited by ultrafast spray technique at 450 °C for 30 s. Cu concentration in the ZnO system was varied from 0 at.% to 2.5 at.%, as detected by X-ray fluorescence spectroscopy. From the structural analysis, X-ray diffraction patterns show that (100), (002), and (101) planes are observed in pure ZnO. By inserting a Cu concentration of 2 at.% or higher, the (100) and (101) planes entirely disappear, and the crystal is strongly oriented in (002) plane. The average grain size of the films increases from 113.6 nm to 155.8 nm by increasing the Cu content, as observed by scanning electron microscopy. Furthermore, current-voltage (I–V) characteristics show that the 1.5 at.% Cu concentration has the highest UV sensitivity. Such behavior may be originated from carrier trapping under the dark and de-trapping under ultraviolet illumination, as analyzed using UV–Vis, photoluminescence, and FTIR spectroscopy techniques. This interesting result will be confirmed through optical properties analysis. This result is important for the development of a mass-scale UV detector based on ZnO film with short fabrication time and improved functionality. © 2021
Department of Materials Engineering, Institut Teknologi Sumatera, Lampung, 35365, Indonesia; Department of Physics, Institut Teknologi Sumatera, Terusan Ryacudu, Lampung, 35365, Indonesia; Division of Inorganic and Physical Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha no. 10, Bandung, 40132, Indonesia; Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Jalan Ganesha no. 10, Bandung, 40132, Indonesia; Center for Catalysis and Reaction Engineering, Institut Teknologi Bandung, Jalan Ganesha no. 10, Bandung, 40132, Indonesia; Research Unit for Clean Technology, Indonesian Institute of Sciences, Bandung, 40135, Indonesia
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