Abstract
The effect of transition metal (TM) ion mixing on the crystal structure, surface morphology, microstructure, and optical properties of gallium oxide (Ga2O3) have been reported. The polycrystalline TM-mixed Ga2O3 (referred to TMGO; TM = Fe, Ti, W) materials were synthesized via a conventional, high-temperature solid-state chemical reaction method. The detailed investigation based on x-ray diffraction (XRD), scanning electron microscopy (SEM), and optical absorption measurements indicates the effect of Fe, Ti, and W incorporation on the structural and optical properties of Ga2O3. The marked difference in the mixing of various TM-ions (Fe3+, Ti4+, and W6+) is strongly reflected in the solubility limit of the respective TM-ions. For the constant amount of TM-ion alloying/mixing, no secondary phase formation occurs with Fe or W, while TiO2 secondary phase formation occurs for Ti. The optical band gap (~ 4.6 eV) of intrinsic Ga2O3 reduces significantly with Fe as compared to that of W and Ti.
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Acknowledgements
The authors acknowledge, with pleasure, support from the National Science Foundation (NSF) with NSF-PREM Grant #DMR-1827745.
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Zade, V., Swadipta, R. & Ramana, C.V. Crystal Structure, Phase Stability, Microstructure, and Optical Properties of Transition Metal Incorporated Wide Band Gap Ga2O3. JOM 74, 79–86 (2022). https://doi.org/10.1007/s11837-021-05015-z
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DOI: https://doi.org/10.1007/s11837-021-05015-z