期刊
CERAMICS INTERNATIONAL
卷 47, 期 12, 页码 17276-17285出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.03.039
关键词
Film thickness; Sol-gel spin coating method; Mn-doped ZnO; Structural properties; DFT plus U
资金
- Malaysian Ministry of Higher Education [FRGS/1/2020/TK0/USM/02/4, 203.PBAHAN.6071467]
- Algerian Ministry of Higher Education under the Exceptional National Program (ENP)
The study investigated the effect of thickness on the structural, morphological, electronic, and optical properties of pure zinc oxide (ZnO) and 7% Mn-doped ZnO thin films. It was found that as thickness increased, transmittance decreased and bandgap energy inversely varied with coating number. The theoretical and experimental findings were in agreement, showing a decrease in bandgap energy from pure to 6.25% Mn-doped ZnO material.
The current study investigates the effect of thickness on the structural, morphological, electronic, and optical properties of pure zinc oxide (ZnO) and 7% Mn-doped ZnO thin films, deposited by sol-gel spin coating method. All films exhibited a hexagonal wurtzite structure with a high preferential c-axis orientation. The surface morphology showed a good uniformity with cracks and wrinkles. The transmittance decreased with thickness. The bandgap energy was inversely varying with coating number. Photoluminescence spectra showed ultraviolet with strong and weak blue and weak green emission peaks. Density functional theory and Hubbard (DFT + U) method was then applied to study the structural, electronic, and optical properties of pure and 6.25% Mn-doped ZnO materials. A decrease in bandgap energy from pure to 6.25% Mn-doped ZnO material was shown using the DFT + U method. It also found that the Mn3d states were distributed far from Fermi level with a coexistence of both ionic and covalent nature bonds. A slight shift toward the lower energy was noticed for optical properties by Mn doping. The theoretical findings showed a similar behavior to those obtained by experiment.
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