Experimental Study of Phonon-Folding in Si/Ge and Si/Sige Structures Designed for Thermoelectric Applications
- 1 January 1998
- journal article
- Published by Springer Nature in MRS Proceedings
Abstract
We report data of Raman study of Si/Ge and Si/SiGe superlattices designed for thermoelectric applications. The obtained Raman spectra clearly indicate the presence of folded doublets from longitudinal acoustic phonons. Due to the significant difference in the sound velocities for Si and Ge the position of the doublets strongly depends on the superlattice layer thickness and ordering. Comparison of the Raman data for different samples with measured thermal and thermoelectric properties allows us to determine a correlation between the strength of the phonon confinement in these structures and their thermoelectric properties. Our experimental results are consistent with recent theoretical prediction of increased thermoelectric figure of merit in semiconductor quantum wells.Keywords
This publication has 8 references indexed in Scilit:
- Effect of phonon confinement on the thermoelectric figure of merit of quantum wellsJournal of Applied Physics, 1998
- Significant decrease of the lattice thermal conductivity due to phonon confinement in a free-standing semiconductor quantum wellPhysical Review B, 1998
- Anisotropic Thermal Conductivity of A Si/Ge SuperlatticeMRS Proceedings, 1998
- Size and Interface Effects on Thermal Conductivity of Superlattices and Periodic Thin-Film StructuresJournal of Heat Transfer, 1997
- Observation of folded acoustic phonons in nanocrystalline silicon/amorphous silicon multilayersApplied Physics Letters, 1996
- Experimental study of the effect of quantum-well structures on the thermoelectric figure of meritPhysical Review B, 1996
- Effect of quantum-well structures on the thermoelectric figure of meritPhysical Review B, 1993
- Folded acoustic and quantized optic phonons in (GaAl)As superlatticesPhysical Review B, 1985