Chemical Solution Deposition of Epitaxial Indium- and Aluminum-Doped Ga2O3 Thin Films on Sapphire with Tunable Bandgaps
Taboada Vasquez, Jose Manuel
KAUST DepartmentComputer, Electrical and Mathematical Science and Engineering (CEMSE) Division
Material Science and Engineering Program
Material Science and Engineering
Physical Science and Engineering (PSE) Division
Advanced Semiconductor Laboratory
Electrical and Computer Engineering Program
Embargo End Date2022-10-02
Permanent link to this recordhttp://hdl.handle.net/10754/672061
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AbstractCompared to the vacuum-required deposition techniques, the chemical solution deposition (CSD) technique is superior in terms of low cost and ease of cation adjustment and upscaling. In this work, highly epitaxial indium- and aluminum-doped Ga2O3 thin films are deposited using a novel CSD technique. The 2θ, rocking curve, and φ-scan modes of x-ray diffraction (XRD) measurements and high-resolution transmission electron microscopy suggest that these thin films have a pure beta phase with good in- and out-of-plane crystallization qualities. The effect of incorporating indium and aluminum into the crystallization process is studied using high-temperature in situ XRD measurements. The results indicate that indium and aluminum doping can shift the crystallization of the thin films to lower and higher temperatures, respectively. Additionally, ultraviolet-visible spectroscopy measurements indicate that the bandgap of the sintered thin films can be tuned from 4.05 to 5.03 eV using a mixed precursor solution of In:Ga = 3:7 and Al:Ga = 3:7. The photodetectors based on the (InGa)2O3, pure Ga2O3, and (AlGa)2O3 samples exhibit the maximum photocurrents at 280, 255, and 230 nm, respectively. The results suggest that the described CSD technique is promising for producing high-quality bandgap tunable deep-ultraviolet photoelectrical and high-power devices.
CitationTang, X., Li, K.-H., Liao, C.-H., Taboada Vasquez, J. M., Wang, C., Xiao, N., & Li, X. (2021). Chemical Solution Deposition of Epitaxial Indium- and Aluminum-Doped Ga2O3 Thin Films on Sapphire with Tunable Bandgaps. Journal of the European Ceramic Society. doi:10.1016/j.jeurceramsoc.2021.09.064
SponsorsThe authors would like to thank KAUST Baseline Funds BAS/1/1664-01-01, Competitive Research Grants URF/1/3437-01-01 and URF/1/3771-01-01, and GCC Research Council REP/1/3189-01-01 for their support.