Journal article

Publication year: 2020

Journal: physica status solidi (a) – applications and materials science

Volume number: 217

Issue number: 10

ISSN: 1862-6300

eISSN: 1862-6319

Open access status: Hybrid

DOI Link: https://doi.org/10.1002/pssa.201901009

Publisher: Wiley

Abstract: 
beta-Ga2O3 thin films are deposited by pulsed radio-frequency (RF) magnetron sputtering on c-sapphire substrates, using a stoichiometric Ga2O3 target and a constant gas flux of an argon-oxygen mixture. Pulsed sputtering offers a way to overcome the restrictions of conventional sputtering. The parameters RF power and pulse duty cycle (PDC) are varied systematically to optimize the synthesis of Ga2O3 thin films. Subsequently, the resulting as-deposited (AD) Ga2O3 layers are analyzed in terms of structural and optical properties and the results are compared with those on the samples treated by postdeposition rapid thermal annealing. Based on this analysis, the process parameters are evaluated in terms of beta-Ga2O3 formation. Postdeposition temperature treatments are found to yield a better crystal quality. However, a strong interdiffusion with the Al2O3 substrate is observed. The optical bandgap of the sputtered thin films is found to be quite independent of the RF sputtering power but to depend strongly on the PDC used, whereas the layer thickness rather strongly increases with both of those growth parameters. These evolutions are assigned to changes in the energy and ionic species of the plasma. Traces of GaOx-related phases in addition to beta-Ga2O3 are found in the interphase between the growing thin films and the underlying substrate.

Harvard Citation style: Schurig, P., Michel, F., Beyer, A., Volz, K., Becker, M., Polity, A., et al. (2020) Progress in Sputter Growth of β-Ga₂O₃ by Applying Pulsed-Mode Operation, physica status solidi (a) – applications and materials science, 217(10), Article 1901009. https://doi.org/10.1002/pssa.201901009

APA Citation style: Schurig, P., Michel, F., Beyer, A., Volz, K., Becker, M., Polity, A., & Klar, P. (2020). Progress in Sputter Growth of β-Ga₂O₃ by Applying Pulsed-Mode Operation. physica status solidi (a) – applications and materials science. 217(10), Article 1901009. https://doi.org/10.1002/pssa.201901009