Freestanding high quality GaN substrate by associated GaN nanorods self-separated hydride vapor-phase epitaxy

C. L. Chao, C. H. Chiu, Y. J. Lee, H. C. Kuo, Po Chun Liu, Jeng Dar Tsay, S. J. Cheng

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47 Citations (Scopus)


This work proposes a method for fabricating 2 in. freestanding GaN substrates of high crystallographic quality and low residual strain. Arrays of GaN nanorods with sidewalls coated with silicon dioxide (SiO2) were randomly arranged on the sapphire substrate as a growth template for subsequent hydride vapor-phase epitaxy (HVPE). The passivation of the sidewalls coated with SiO2 prevents the coalescence of GaN grains in spaces between the rods, causing them to grow preferentially on the top of individual rods. The proposed method significantly improves GaN crystal quality and results in self-separation from the underlying host sapphire substrate due to the relaxation of thermal strains in the HVPE cooling-down process.

Original languageEnglish
Article number051905
JournalApplied Physics Letters
Issue number5
Publication statusPublished - 2009 Aug 14


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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