Nanoscale photovoltaic characteristics of single quantum dot hybridized with poly(3-hexylthiophene)

Yoon Deok Han, Sumin Jeon, Sun Dal Kim, Ji Hee Kim, Sang Youl Kim, Jeongyong Kim, Kwang Sup Lee, Jinsoo Joo

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Hybrids consisting of CdSe/ZnS quantum dot (QD) as a core and thiol-group functionalized poly(3-hexylthiophene) (P3HT) as a shell were fabricated using the ligand-exchange method. We clearly observed the photovoltaic characteristics of a single QD-P3HT hybrid by using conducting atomic force microscopy. Monochromatic power conversion efficiency drastically increased with an increase in the molecular weight (Mw) of P3HT, suggesting sufficient photoinduced charge transfer between the QD and highly ordered P3HT chains. The nanoscale photoluminescence (PL) intensity for a single QD considerably decreased with increasing Mw of P3HT owing to charge transfer effects. On the basis of time-resolved PL and transient absorption spectra measurements of the QD-P3HT hybrids, we deduced that the exciton lifetimes of the QD were reduced with higher-Mw P3HT hybrids, and photobleaching was observed. The measured nanoscale optical characteristics of the single QD-P3HT hybrids support their distinct photovoltaic behaviors.

Original languageEnglish
Pages (from-to)2893-2902
Number of pages10
JournalOrganic Electronics
Volume15
Issue number11
DOIs
Publication statusPublished - 2014 Nov 11

Keywords

  • Hybrid
  • Photovoltaics
  • Poly(3-hexylthiophene)
  • Quantum dot Optoelectronics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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