On the origin of photoluminescence in silicon nanocrystals

Pressure-dependent structural and optical studies

Daniel C. Hannah, Jihua Yang, Paul Podsiadlo, Maria K Y Chan, Arnaud Demortière, David J. Gosztola, Vitali B. Prakapenka, George C Schatz, Uwe Kortshagen, Richard D Schaller

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

A lack of consensus persists regarding the origin of photoluminescence in silicon nanocrystals. Here we report pressure-dependences of X-ray diffraction and photoluminescence from alkane-terminated colloidal particles. We determine the diamond-phase bulk modulus, observe multiple phase transitions, and importantly find a systematic photoluminescence red shift that matches the X conduction-to-Λ valence transition of bulk crystalline silicon. These results, reinforced by calculations, suggest that the efficient photoluminescence, frequently attributed to defects, arises instead from core-states that remain highly indirect despite quantum confinement.

Original languageEnglish
Pages (from-to)4200-4205
Number of pages6
JournalNano Letters
Volume12
Issue number8
DOIs
Publication statusPublished - Aug 8 2012

Fingerprint

Silicon
Nanocrystals
Photoluminescence
nanocrystals
photoluminescence
silicon
Diamond
Alkanes
Quantum confinement
bulk modulus
red shift
Paraffins
pressure dependence
alkanes
Diamonds
Elastic moduli
Phase transitions
diamonds
Crystalline materials
valence

Keywords

  • diamond anvil cell
  • nanocrystal
  • photoluminescence
  • pressure
  • Quantum dot
  • silicon
  • X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Hannah, D. C., Yang, J., Podsiadlo, P., Chan, M. K. Y., Demortière, A., Gosztola, D. J., ... Schaller, R. D. (2012). On the origin of photoluminescence in silicon nanocrystals: Pressure-dependent structural and optical studies. Nano Letters, 12(8), 4200-4205. https://doi.org/10.1021/nl301787g

On the origin of photoluminescence in silicon nanocrystals : Pressure-dependent structural and optical studies. / Hannah, Daniel C.; Yang, Jihua; Podsiadlo, Paul; Chan, Maria K Y; Demortière, Arnaud; Gosztola, David J.; Prakapenka, Vitali B.; Schatz, George C; Kortshagen, Uwe; Schaller, Richard D.

In: Nano Letters, Vol. 12, No. 8, 08.08.2012, p. 4200-4205.

Research output: Contribution to journalArticle

Hannah, DC, Yang, J, Podsiadlo, P, Chan, MKY, Demortière, A, Gosztola, DJ, Prakapenka, VB, Schatz, GC, Kortshagen, U & Schaller, RD 2012, 'On the origin of photoluminescence in silicon nanocrystals: Pressure-dependent structural and optical studies', Nano Letters, vol. 12, no. 8, pp. 4200-4205. https://doi.org/10.1021/nl301787g
Hannah DC, Yang J, Podsiadlo P, Chan MKY, Demortière A, Gosztola DJ et al. On the origin of photoluminescence in silicon nanocrystals: Pressure-dependent structural and optical studies. Nano Letters. 2012 Aug 8;12(8):4200-4205. https://doi.org/10.1021/nl301787g
Hannah, Daniel C. ; Yang, Jihua ; Podsiadlo, Paul ; Chan, Maria K Y ; Demortière, Arnaud ; Gosztola, David J. ; Prakapenka, Vitali B. ; Schatz, George C ; Kortshagen, Uwe ; Schaller, Richard D. / On the origin of photoluminescence in silicon nanocrystals : Pressure-dependent structural and optical studies. In: Nano Letters. 2012 ; Vol. 12, No. 8. pp. 4200-4205.
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