Optical properties of InN films grown by pressurized-reactor metalorganic vapor phase epitaxy

Yuantao Zhang, Takeshi Kimura, Kiattiwut Prasertusk, Takuya Iwabuchi, Suresh Kumar, Yuhuai Liu, Ryuji Katayama, Takashi Matsuoka

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

InN thin films have been grown using a pressurized-reactor metalorganic vapor phase epitaxy system at 500-700 C under the pressure of 2.1 × 105 Pa. Photoluminescence (PL), optical reflectance and transmission measurements were performed at room temperature. We found that optical properties of these as-grown films strongly depend on the growth temperature. By analyzing the reflectance spectra, it is found that the calculated carrier concentrations of the films increased with decreasing growth temperature. Room-temperature photoluminescence spectra show that the films grown at temperatures higher than 575 C have strong emission peaks at 0.68-0.75 eV, while those grown at temperatures lower than and equal to 575 C have negligible emission. The quenching of the emission is attributed to the existences of cubic InN and a high-density of nonradiative recombination centers in the films grown at low growth temperature region. Especially for the case of high temperature growth, the growth temperature dependence of the absorption-edge energy shows a similar tendency with that of the PL peak energy, both blue-shifted with decreasing the growth temperature possibly due to the well-known Burstein-Moss effects. From these results, an optimum growth temperature of 675 C in the pressurized growth could be obtained.

Original languageEnglish
Pages (from-to)152-155
Number of pages4
JournalThin Solid Films
Volume536
DOIs
Publication statusPublished - 2013 Jun 1

Keywords

  • Indium nitride
  • Metalorganic vapor phase epitaxy
  • Optical properties
  • Thin films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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