Experimental study of phonon-folding in Si/Ge and Si/SiGe structures designed for thermoelectric applications

J. Liu, A. Balandin, T. Borca-Tasciuc, Y. S. Tang, K. L. Wang, G. Chen

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)111-116
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume545
Publication statusPublished - 1999
EventProceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998' - Boston, MA, USA
Duration: 1998 Nov 301998 Dec 3

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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