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Low temperature growth of Ga2O3 thin films on Si substrates by MOCVD and their electrical characteristics

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2022, 32(2), pp.45-50
  • DOI : 10.6111/JKCGCT.2022.32.2.045
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : March 18, 2022
  • Accepted : April 8, 2022
  • Published : April 30, 2022

Jungbok Lee 1 Ahn Nam Jun 1 Hyung Soo Ahn 1 Kyoung-Hwa Kim 1 Min Yang 1

1한국해양대학교

Accredited

ABSTRACT

Ga2O3 thin films were grown on n-type Si substrates at various growth temperatures of 500, 550, 600, 650 and 700°C. The Ga2O3 thin films grown at 500°C and 550°C were characterized as featureless flat surface. Grown at highertemperatures (600, 650, and 700°C) showed very rough surface morphology. To figure out the annealing effect on the thin films grown at relatively low temperatures (500, 550, 600, 650 and 700°C), the Ga2O3 films were thermally treated at 900°C for 10 minutes. Crystal structure of the Ga2O3 f ilms g rown a t 500 and 550°C were changed from amorphous to polycrystallinestructure with flat surface. Ga2O3 film grown at 550°C was chosen for the fabrication of a Schottky barrier diode (SBD). Electrical properties of the SBDs depend on the thermal treatment were evaluated. A MSM type photodetector wasmade on the low temperature grown Ga2O3 thin film. The photocurrent for the illumination of 266 nm wavelength showed 5.32 times higher than dark current at the operating voltage of 10 V.

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