Raman scattering studies of (GaP)n/(InP)n (n = 1, 1.7, 2) short-period superlattice structures

Title
Raman scattering studies of (GaP)n/(InP)n (n = 1, 1.7, 2) short-period superlattice structures
Authors
H. RhoJ.-R. Lim송진동최원준이용탁
Keywords
GaP/InP; Raman; LCM; Raman scattering; short-period superlattice; lateral composition modulation; transmission electron microscope
Issue Date
2009-10
Publisher
Journal of Raman spectroscopy : JRS
Citation
VOL 40, NO 9, 1178-1182
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/35954
ISSN
0377-0486
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