Journal
JOURNAL OF APPLIED PHYSICS
Volume 104, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2986140
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In this paper we report a study of phase separation in bulk InxGa1-xN films grown by metal organic chemical-vapor deposition using mid-UV Raman spectroscopy. Evidence of phase separation is observed by the occurrence of low frequency shoulders identified as minority phase in the A(1)(LO) Raman mode. A phase transition in the alloy from the metastable to unstable region was found to be occurring at an indium concentration of about 25%. Raman spectroscopic results also indicate that the compositional inhomogenity in our samples increase, as would be expected, with depth in the film. A direct correspondence is also found between the percentage of indium concentration in the film and the amount of compositional inhomogenity. (c) 2008 American Institute of Physics.
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