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High-Quality GaN Grown by Molecular Beam Epitaxy on Ge(001)

  • H. Siegle (a1) (a2), Y. Kim (a1) (a2), G. S. Sudhir (a1) (a2), J. Kruger (a1) (a2), P. Perlin (a2), J. W. Ager (a2), C. Kislelowski (a3) and E. R. Weber (a1)...

Abstract

We report on growth of GaN on Germanium as an alternative substrate material. The GaN films were deposited on Ge(001) substrates by plasma-assisted molecular beam epitaxy. Atomic force microscopy, x-ray diffraction, photoluminescence, and Raman spectroscopy were used to characterize the structural and optical properties of the films. We observed that the Ga/N ratio plays a crucial role in determining the phase purity and crystal quality. Under N-rich conditions the films were phase-mixed, containing cubic and hexagonal GaN, while in the Ga-rich regime they were purily hexagonal. The latter samples show bandedge luminescence with linewidths as small as 31 meV at low temperatures.

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High-Quality GaN Grown by Molecular Beam Epitaxy on Ge(001)

  • H. Siegle (a1) (a2), Y. Kim (a1) (a2), G. S. Sudhir (a1) (a2), J. Kruger (a1) (a2), P. Perlin (a2), J. W. Ager (a2), C. Kislelowski (a3) and E. R. Weber (a1)...

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