Phonons in short-period (001)-Si(n)Ge(n) Superlattices (SL's) have been studied both theoretically, by a first priniciples approach including strain and interface intermixing, and experimentally by micro-Raman spectroscopy where in-plane scattering geometries allow the observation of both longitudinal (L) and transverse (T) modes. Experimental data are found to deviate considerably from theoretical predictions for SL's with ideally sharp interfaces, both in frequency of higher-order confined Si-like modes and in the polarization dependence of the SiGe-like ''interface'' peak (lineshape and L-T splitting). Supercell calculations representing interface intermixing within a simple model by 2-3 monolayers of SiGe alloy at the interfaces are found to reproduce these major experimental findings. Measurements of Raman resonance profiles of various SL phonon modes strongly confirm their calculated different spatial localization.

VIBRATIONAL PROPERTIES OF SI/GE SUPERLATTICES - THEORY AND INPLANE RAMAN-SCATTERING EXPERIMENTS / Schorer, R; Abstreiter, G; Degironcoli, S; Molinari, Elisa; Kibbel, H; Kasper, E.. - In: SOLID-STATE ELECTRONICS. - ISSN 0038-1101. - STAMPA. - 37:(1994), pp. 757-760.

VIBRATIONAL PROPERTIES OF SI/GE SUPERLATTICES - THEORY AND INPLANE RAMAN-SCATTERING EXPERIMENTS

MOLINARI, Elisa;
1994

Abstract

Phonons in short-period (001)-Si(n)Ge(n) Superlattices (SL's) have been studied both theoretically, by a first priniciples approach including strain and interface intermixing, and experimentally by micro-Raman spectroscopy where in-plane scattering geometries allow the observation of both longitudinal (L) and transverse (T) modes. Experimental data are found to deviate considerably from theoretical predictions for SL's with ideally sharp interfaces, both in frequency of higher-order confined Si-like modes and in the polarization dependence of the SiGe-like ''interface'' peak (lineshape and L-T splitting). Supercell calculations representing interface intermixing within a simple model by 2-3 monolayers of SiGe alloy at the interfaces are found to reproduce these major experimental findings. Measurements of Raman resonance profiles of various SL phonon modes strongly confirm their calculated different spatial localization.
37
757
760
VIBRATIONAL PROPERTIES OF SI/GE SUPERLATTICES - THEORY AND INPLANE RAMAN-SCATTERING EXPERIMENTS / Schorer, R; Abstreiter, G; Degironcoli, S; Molinari, Elisa; Kibbel, H; Kasper, E.. - In: SOLID-STATE ELECTRONICS. - ISSN 0038-1101. - STAMPA. - 37:(1994), pp. 757-760.
Schorer, R; Abstreiter, G; Degironcoli, S; Molinari, Elisa; Kibbel, H; Kasper, E.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/10482
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