Axial silicon-germanium nanowires: Properties and device applications

L. Tsybeskov, T. I. Kamins, X. Wu, D. J. Lockwood

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Dense nanowire films can be considered as quasi-porous structures with a high surface-to-volume ratio. From this perspective, structural, optical and electrical properties of axial Si-Ge nanowire heterojunctions produced by the vapor-liquid-solid growth method using Au nanoclusters as catalysts are analyzed. The lattice mismatch induced strain is partially relieved due to spontaneous SiGe intermixing at the heterointerface and lateral expansion of the Ge segment of the nanowire. The mismatch in Ge and Si coefficients of thermal expansion and low thermal conductivity of Si-Ge nanowire heterojunctions are found to be responsible for the thermally induced stress detected under intense laser radiation in photoluminescence and Raman scattering measurements. In electrical measurements, the observed non-linear current-voltage characteristics, strong flicker noise, and damped current oscillations with frequencies of 20-30 MHz are explained using a proposed SiGe nanowire heterojunction energy band diagram that includes energy states associated with structural imperfections at the nanowire surface.

Original languageEnglish (US)
Title of host publicationPRiME 2020
Subtitle of host publicationPits and Pores 9: Nanomaterials - Fabrication, Properties, and Applications
EditorsP. Granitzer, D. Lockwood, H. Habazaki, S. Virtanen, H. Imahori
PublisherIOP Publishing Ltd.
Pages13-28
Number of pages16
Edition2
ISBN (Electronic)9781607685395
DOIs
StatePublished - 2020
EventPacific Rim Meeting on Electrochemical and Solid State Science 2020, PRiME 200 - Honolulu, United States
Duration: Oct 4 2020Oct 9 2020

Publication series

NameECS Transactions
Number2
Volume98
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

ConferencePacific Rim Meeting on Electrochemical and Solid State Science 2020, PRiME 200
Country/TerritoryUnited States
CityHonolulu
Period10/4/2010/9/20

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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