Microscopic origin of the fast blue-green luminescence of chemically synthesized non-oxidized silicon quantum dots

K. Dohnalova, A. Fucikova, C.P. Umesh, J. Humpolickova, Jos Marie Johannes Paulusse, J. Valenta, H. Zuilhof

Research output: Contribution to journalArticleAcademicpeer-review

40 Citations (Scopus)

Abstract

The microscopic origin of the bright nanosecond blue-green photoluminescence (PL), frequently reported for synthesized organically terminated Si quantum dots (Si-QDs), has not been fully resolved, hampering potential applications of this interesting material. Here a comprehensive study of the PL from alkyl-terminated Si-QDs of 2–3 nm size, prepared by wet chemical synthesis is reported. Results obtained on the ensemble and those from the single nano-object level are compared, and they provide conclusive evidence that efficient and tunable emission arises due to radiative recombination of electron–hole pairs confined in the Si-QDs. This understanding paves the way towards applications of chemical synthesis for the development of Si-QDs with tunable sizes and bandgaps.
Original languageEnglish
Pages (from-to)3185-3191
JournalSmall
Volume8
Issue number20
DOIs
Publication statusPublished - 2012

Keywords

  • IR-85079
  • METIS-293900

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