Depth-dependent optical properties of a HVPE-grown freestanding Si-doped GaN single crystal

Eui Kwan Koh, Il Woo Park, H. Choi, M. Yoon, Sung Ho Choh, Hang Sung Kim, Yong Min Cho, Sangsig Kim, Sung Soo Park

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Results of the cathodoluminescence (CL) and micro-Raman measurements in a freestanding 300 μm-thick Si-doped GaN single crystal grown by hydride vapor phase epitaxy (HVPE) are presented. The depth-dependent CL results along the c-axis on the cross-section show that the integrated CL intensities of the near-band-gap emission gradually increase with the CL linewidths broadened from the N face to the Ga face. The physical origin of increase in the CL intensity has been studied by the micro-Raman measurements along the c-axis, which revealed the carrier concentration gradually increases from 2.3×10 17 (the N face) to 9.3×1017 cm-3 (the Ga face). Our experimental evidence indicates that the broadening of the CL linewidth is due to the increased fluctuation of the local bandgap caused by the heavier concentration of the donor impurities.

Original languageEnglish
Pages (from-to)37-42
Number of pages6
JournalJournal of Crystal Growth
Issue number1-2
Publication statusPublished - 2005 Mar 15

Bibliographical note

Funding Information:
This work has been supported by Korea Science and Engineering Foundation (KOSEF).


  • A1. Cathodoluminescence
  • A1. Raman scattering
  • A3. Hydride vapor phase epitaxy
  • B1. GaN

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry


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