Phonons in mesoporous silicon: The influence of nanostructuring on the dispersion in the Debye regime

Tommy Hofmann, Dirk Wallacher, Rasmus Toft-Petersen, Britta Ryll, Manfred Reehuis, Klaus Habicht

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We present a comprehensive scattering study of nanostructured silicon. Neutron and x-ray scattering experiments elucidate structural and dynamical properties of electrochemically etched, porous silicon membranes with pores roughly 8 nm across. In particular, inelastic cold neutron scattering techniques reveal the phonon dispersion of the nanostructured, single crystalline samples in the linear Debye regime for energy transfers up to 4 meV. A modified dispersion relation characterized by systematically reduced sound velocities manifests itself in altered elastic properties of porous silicon when compared to bulk silicon. Its relevance for nanostructured silicon as thermoelectric material of interest is discussed.
Original languageEnglish
JournalMicroporous and Mesoporous Materials
Volume243
Pages (from-to)263-270
Number of pages8
ISSN1387-1811
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • Mesoporous silicon
  • Inelastic neutron scattering
  • Phonon dispersion
  • Elasticity
  • Thermoelectric material

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