Raman scattering studies of (GaP)n/(InP)n (n = 1, 1.7, 2) short-period superlattice structures
- Raman scattering studies of (GaP)n/(InP)n (n = 1, 1.7, 2) short-period superlattice structures
- H. Rho; J.-R. Lim; 송진동; 최원준; 이용탁
- GaP/InP; Raman; LCM; Raman scattering; short-period superlattice; lateral composition modulation; transmission electron microscope
- Issue Date
- Journal of Raman spectroscopy : JRS
- VOL 40, NO 9, 1178-1182
- We report Raman scattering from (GaP)n/(InP)n (n = 1, 1.7, 2) short-period superlattice (SPS) structures to study the effect of
lateral composition modulation (LCM) on the behavior of optical phonons. Cross-sectional transmission electron microscope
images revealed that LCM was formed with complex pattern in the n = 1.7 and n = 2 samples grown at 490 ◦C. Interestingly,
both the InP- and the GaP-like longitudinal optical (LO) phonon energies increased systematically as the number ofmonolayers
was increased from n = 1 to n = 2. A significant broadening of the phonon line shapes was also observed for the n = 1.7 and
n = 2 samples. In contrast, for samples grown at 425 ◦C, both the increase of the LO phonon energies and the broadening of the
phonon line shapeswere observed onlywhen n = 1.7. Our results demonstrate that the optical phonons in the (GaP)n/(InP)n SPS
structures are significantly affected in the occurrence of LCMrelated to the growth temperature and the number ofmonolayers.
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