Blueshift of the optical bandgap in ZnO films by controlling the substrate temperature

Nurfani, Eka (Department of Materials Engineering, Institut Teknologi Sumatera, Lampung 35365, Indonesia)
Chotimah, Cindy (Department of Materials Engineering, Institut Teknologi Sumatera, Lampung 35365, Indonesia)
Anrokhi, M.S. (Department of Physics, Institut Teknologi Sumatera, Lampung 35365, Indonesia)
Kadja, G.T.M. (Division of Inorganic and Physical Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha no. 10, Bandung 40132, Indonesia)
Sipahutar, W.S. (Department of Materials Engineering, Institut Teknologi Sumatera, Lampung 35365, Indonesia)
Mustaqim, A. (Department of Engineering Physics, Institut Teknologi Sumatera, Lampung 35365, Indonesia)
Rianjanu, A. (Department of Materials Engineering, Institut Teknologi Sumatera, Lampung 35365, Indonesia)

JFA (Jurnal Fisika dan Aplikasinya)
Vol 21, No 1 (2025)

This study investigates the growth of ZnO thin films using the spray pyrolysis method, focusing on the effect of substrate temperature on the optical bandgap. By varying the deposition temperature from 300 to 500 °C, we aim to understand how temperature influences the optical properties of ZnO films. The films were characterized using X-ray diffraction (XRD) and UV-visible spectroscopy (UV-Vis). At 300 °C, the absorption was lowest, and the optical bandgap increased from 3.20 eV at 300 °C to 3.70 eV at 500 °C. These findings are crucial for developing ZnO materials for optoelectronic applications using an efficient and cost-effective deposition method.