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Chmielewski, Adrian
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Publications (6/6 displayed)
- 2022Effect of size on the surface energy of noble metal nanoparticles from analytical and numerical approachescitations
- 2022Alloyed β-(Al<i>x</i>Ga1−<i>x</i>)2O3 bulk Czochralski single β-(Al0.1Ga0.9)2O3 and polycrystals β-(Al0.33Ga0.66)2O3, β-(Al0.5Ga0.5)2O3), and property trendscitations
- 2021Atomic-scale characterization of structural and electronic properties of Hf doped β-Ga2O3citations
- 2021Is There Really a Size effect on the Surface Energy of Nanoparticles ?
- 2018Direct Measurement of the Surface Energy of Bimetallic Nanoparticles: Evidence of Vegard’s Rulelike Dependencecitations
- 2017Direct measurement of the surface energy of bimetallic nanoparticles: Evidence of Vegard's rule-like dependencecitations
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article
Atomic-scale characterization of structural and electronic properties of Hf doped β-Ga2O3
Abstract
In this Letter, we investigate the atomic and electronic structure of a Hf-doped beta-gallium oxide (β-Ga2O3) single crystal using high resolution scanning transmission electron microscopy imaging and electron energy loss spectroscopy. Ultraviolet-visible (UV-Vis)-near-infrared absorption measurements and density functional theory calculations are performed to further connect the nanoscale observation to the macroscale properties arising from the atomic structure. The Hf-doped sample was grown from the melt with a nominal Hf concentration of 0.5 at. %. We show that the Hf dopants prefer to occupy octahedral over tetrahedral sites by 0.68 eV and have some resistance to form precipitates due to a repulsive interaction of 0.17 eV between Hf atoms on neighboring sites. Also, the presence of Hf atoms on either tetrahedral or octahedral sites do not significantly affect the crystal structure of β-Ga2O3. Finally, the bandgap values of the Hf doped β-Ga2O3 obtained by electron energy loss spectroscopy and UV-Vis-spectroscopy were Eg = 4.83 ± 0.1 and 4.75 ± 0.02 eV, respectively, similar to the values reported for unintentionally doped β-Ga2O3 crystals. All these results make Hf an excellent dopant candidate for β-Ga2O3.