Strain engineering as one of the most powerful techniques for tuning optical and electronic properties of III-nitrides requires reliable methods for strain *** this work,we reveal,that the linear model based on the ex...
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Strain engineering as one of the most powerful techniques for tuning optical and electronic properties of III-nitrides requires reliable methods for strain *** this work,we reveal,that the linear model based on the experimental data limited to within a small range of biaxial strains(group-III nitrides gaN and ***,we found that the discrepancy between the experimental values of strain and those calculated via Raman spectroscopy increases as the strain in both gaN and AlN ***,a new model has been developed to describe the strain-induced Raman frequency shift in gaN and AlN for a wide range of biaxial strains(up to 2.5%).Finally,we proposed a new approach to correlate the Raman frequency shift and strain,which is based on the lattice coherency in the epitaxial layers of superlattice structures and can be used for a wide range of materials.
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