Author:
Cooke Jacqueline,Ranga Praneeth,Jesenovec Jani,McCloy John S.,Krishnamoorthy Sriram,Scarpulla Michael A.,Sensale-Rodriguez Berardi
Abstract
AbstractIn this work, a systematic photoluminescence (PL) study on three series of gallium oxide/aluminum gallium oxide films and bulk single crystals is performed including comparing doping, epitaxial substrates, and aluminum concentration. It is observed that blue/green emission intensity strongly correlates with extended structural defects rather than the point defects frequently assumed. Bulk crystals or Si-doped films homoepitaxially grown on (010) β-Ga2O3 yield an intense dominant UV emission, while samples with extended structural defects, such as gallium oxide films grown on either (-201) β-Ga2O3 or sapphire, as well as thick aluminum gallium oxide films grown on either (010) β-Ga2O3 or sapphire, all show a very broad PL spectrum with intense dominant blue/green emission. PL differences between samples and the possible causes of these differences are analyzed. This work expands previous reports that have so far attributed blue and green emissions to point defects and shows that in the case of thin films, extended defects might have a prominent role in emission properties.
Funder
Air Force Office of Scientific Research
Publisher
Springer Science and Business Media LLC
Reference53 articles.
1. Pearton, S. et al. A review of Ga2O3 materials, processing, and devices. Appl. Phys. Rev. 5, 011301 (2018).
2. Alkauskas, A., McCluskey, M. D. & Van de Walle, C. G. Tutorial: Defects in semiconductors—Combining experiment and theory. J. Appl. Phys. 119, 181 (2016).
3. Zhang, J. Applications of huang-rhys theory in semiconductor optical spectroscopy. J. Semicond. 40, 091102 (2019).
4. Li, S. L. & Truhlar, D. G. Franck-Condon models for simulating the band shape of electronic absorption spectra. J. Cham. Theory Comput. 13, 2823–2830 (2017).
5. Herbert, W. C., Minnier, H. B. & Brown, J. J. Jr. Self-activated luminescence of β-Ga2O3. J. Electrochem. Soc. Solid State Sci. 116, 1019–1021 (1969).
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