Shell thickness dependent photoinduced hole transfer in hybrid conjugated polymer/quantum dot nanocomposites: From ensemble to single hybrid level

Zhihua Xu, Corey R. Hine, Mathew M. Maye, Qingping Meng, Mircea Cotlet

Research output: Contribution to journalArticle

56 Scopus citations

Abstract

Figure Persented: Photoinduced hole transfer is investigated in inorganic/organic hybrid nanocomposites of colloidal CdSe/ZnS quantum dots and a cationic conjugated polymer, poly(9,9′-bis(6-N,N,N- trimethylammoniumhexyl)fluorene-alt-phenylene, in solution and in solid thin film, and down to the single hybrid level and is assessed to be a dynamic quenching process. We demonstrate control of hole transfer rate in these quantum dot/conjugated polymer hybrids by using a series of core/shell quantum dots with varying shell thickness, for which a clear exponential dependency of the hole transfer rate vs shell thickness is observed, for both solution and thin-film situations. Furthermore, we observe an increase of hole-transfer rate from solution to film and correlate this with changes in quantum dot/polymer interfacial morphology affecting the hole transfer rate, namely, the donor-acceptor distance. Single particle spectroscopy experiments reveal fluctuating dynamics of hole transfer at the single conjugated polymer/quantum dot interface and an increased heterogeneity in the hole-transfer rate with the increase of the quantum dot's shell thickness. Although hole transfer quenches the photoluminescence intensity of quantum dots, it causes little or no effect on their blinking behavior over the time scales probed here.

Original languageEnglish (US)
Pages (from-to)4984-4992
Number of pages9
JournalACS nano
Volume6
Issue number6
DOIs
StatePublished - Jun 26 2012

Keywords

  • conjugated polymers
  • hybrid inorganic/organic
  • optoelectronics
  • photoinduced hole transfer
  • quantum dots
  • single-molecule spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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