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Raman signatures: illuminating relationships between the electrical and optical properties of GaAs1−y
and Bi incorporation
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We report the use of two Raman signatures, the Bi-induced longitudinal-optical-plasmon-coupled (LOPC) mode and the GaAs Fröhlich scattering intensity, present in nominally undoped (100) GaAs
1−yBiy to predict the 300K photoluminescence intensity and Bi composition (y) in GaAs
1−yBiy. The LOPC mode is used to calculate the hole concentration in GaAs
epitaxial layers. A linear relationship between hole concentration and photoluminescence intensity is found for a range of samples grown at various temperatures and growth rates. In addition, the composition (y) of Bi in GaAs
1−yBiy is also found to be linearly related to the GaAs Fröhlich scattering intensity.
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