Tensile stress generation and dislocation reduction in Si-doped Al x Ga1-x N films

I. C. Manning, X. Weng, J. D. Acord, M. A. Fanton, D. W. Snyder, J. M. Redwing

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The effects of Si doping on the evolution of stress in Alx Ga1-x N:Si thin films (x≈0.4-0.6) grown on 6H-SiC by metal organic chemical vapor deposition were investigated using in situ wafer curvature measurements. The results were correlated with changes in film microstructure as observed by transmission electron microscopy. The incorporation of Si into the films resulted in a compressive-to-tensile transition in the biaxial stress at the surface, and the magnitude of the tensile stress was found to increase in proportion to the Si concentration. The stress gradient was attributed to Si-induced dislocation inclination resulting from an effective climb mechanism. Si doping also resulted in a decrease in the threading dislocation density in the Alx Ga1-x N layers, which was attributed to increased dislocation interaction and annihilation. The model describing tensile stress generated by dislocation effective climb was modified to account for the dislocation reduction and was found to yield an improved fit to the experimental stress-thickness data.

Original languageEnglish (US)
Article number023506
JournalJournal of Applied Physics
Volume106
Issue number2
DOIs
StatePublished - Aug 12 2009

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tensile stress
inclination
metalorganic chemical vapor deposition
proportion
curvature
wafers
gradients
transmission electron microscopy
microstructure
thin films
interactions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Tensile stress generation and dislocation reduction in Si-doped Al x Ga1-x N films",
abstract = "The effects of Si doping on the evolution of stress in Alx Ga1-x N:Si thin films (x≈0.4-0.6) grown on 6H-SiC by metal organic chemical vapor deposition were investigated using in situ wafer curvature measurements. The results were correlated with changes in film microstructure as observed by transmission electron microscopy. The incorporation of Si into the films resulted in a compressive-to-tensile transition in the biaxial stress at the surface, and the magnitude of the tensile stress was found to increase in proportion to the Si concentration. The stress gradient was attributed to Si-induced dislocation inclination resulting from an effective climb mechanism. Si doping also resulted in a decrease in the threading dislocation density in the Alx Ga1-x N layers, which was attributed to increased dislocation interaction and annihilation. The model describing tensile stress generated by dislocation effective climb was modified to account for the dislocation reduction and was found to yield an improved fit to the experimental stress-thickness data.",
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Tensile stress generation and dislocation reduction in Si-doped Al x Ga1-x N films. / Manning, I. C.; Weng, X.; Acord, J. D.; Fanton, M. A.; Snyder, D. W.; Redwing, J. M.

In: Journal of Applied Physics, Vol. 106, No. 2, 023506, 12.08.2009.

Research output: Contribution to journalArticle

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