Extrapolation of critical thickness of GaN thin films from lattice constant data using synchrotron X-ray

Chinkyo Kim, I. K. Robinson, Jaemin Myoung, Kyuhwan Shim, Kyekyoon Kim, Myung Cheol Yoo

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

In some materials, Van der Merwe's equilibrium theory of strain relief is believed to explain the sudden transition from pseudomorphic growth of a thin film to a progressively relaxed state. We show, for the first time for GaN, how an accurate estimate of the critical thickness of a thin film can be extrapolated from suitable measurements of lattice constants as a function of film thickness using synchrotron X-ray. We do this both for an elementary elastic energy function, in which the interactions between the dislocations are ignored, and for a more realistic energy estimate due to Kasper. The method is found to work quantitatively for thin films of GaN on AlN. The critical thickness is determined to be 29±4 angstroms.

Original languageEnglish
Pages (from-to)557-561
Number of pages5
JournalMaterials Research Society Symposium - Proceedings
Volume423
Publication statusPublished - 1996 Dec 1
EventProceedings of the 1996 MRS Spring Symposium - San Francisco, CA, USA
Duration: 1996 Apr 81996 Apr 12

Fingerprint

Synchrotrons
Extrapolation
Lattice constants
extrapolation
synchrotrons
X rays
Thin films
thin films
x rays
estimates
Film thickness
film thickness
energy
interactions

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Kim, Chinkyo ; Robinson, I. K. ; Myoung, Jaemin ; Shim, Kyuhwan ; Kim, Kyekyoon ; Yoo, Myung Cheol. / Extrapolation of critical thickness of GaN thin films from lattice constant data using synchrotron X-ray. In: Materials Research Society Symposium - Proceedings. 1996 ; Vol. 423. pp. 557-561.
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Extrapolation of critical thickness of GaN thin films from lattice constant data using synchrotron X-ray. / Kim, Chinkyo; Robinson, I. K.; Myoung, Jaemin; Shim, Kyuhwan; Kim, Kyekyoon; Yoo, Myung Cheol.

In: Materials Research Society Symposium - Proceedings, Vol. 423, 01.12.1996, p. 557-561.

Research output: Contribution to journalConference article

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T1 - Extrapolation of critical thickness of GaN thin films from lattice constant data using synchrotron X-ray

AU - Kim, Chinkyo

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AU - Yoo, Myung Cheol

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