Switchable photoconductivity of quantum dot films using cross-linking ligands with light-sensitive structures

G. Daniel Lilly, Adam C. Whalley, Sergio Grunder, Cory Valente, Matthew T. Frederick, J. Fraser Stoddart, Emily A. Weiss

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

This paper describes the use of a diarylethylene (DAE) ligand, which adopts structures that are sensitive to the wavelength of light, to cross-link films of CdSe quantum dots (QDs) within electrical junctions with photoswitchable conductivity. These QD-DAE films are deposited on indium-tin-oxide/poly(3,4- ethylenedioxy-thiophene):poly(styrenesulfonate) (ITO/PEDOT:PSS) electrodes and have eutectic Ga-In top-contacts. The photocurrent density of the cross-linked QD films is enhanced by a factor of 6.5 (averaged over all applied voltages) when the DAE ligand is switched from its open, non-conductive form (by illumination with 500-650 nm light) to its closed, conductive form (by illumination with 300-400 nm light). This enhancement is accomplished by changing the inter-particle electronic coupling, not the inter-particle distance. Identical QD films cross-linked with dibenzenedithiol ligands have a photoconductivity that is insensitive to the wavelength of light.

Original languageEnglish
Pages (from-to)11492-11497
Number of pages6
JournalJournal of Materials Chemistry
Volume21
Issue number31
DOIs
Publication statusPublished - Aug 21 2011

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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