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

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Photoconductivity
Semiconductor quantum dots
Ligands
Lighting
Thiophenes
Wavelength
Thiophene
Tin oxides
Photocurrents
Indium
Eutectics
Telecommunication links
Electrodes
Electric potential

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemistry(all)

Cite this

Switchable photoconductivity of quantum dot films using cross-linking ligands with light-sensitive structures. / Lilly, G. Daniel; Whalley, Adam C.; Grunder, Sergio; Valente, Cory; Frederick, Matthew T.; Stoddart, J. Fraser; Weiss, Emily A.

In: Journal of Materials Chemistry, Vol. 21, No. 31, 21.08.2011, p. 11492-11497.

Research output: Contribution to journalArticle

Lilly, G. Daniel ; Whalley, Adam C. ; Grunder, Sergio ; Valente, Cory ; Frederick, Matthew T. ; Stoddart, J. Fraser ; Weiss, Emily A. / Switchable photoconductivity of quantum dot films using cross-linking ligands with light-sensitive structures. In: Journal of Materials Chemistry. 2011 ; Vol. 21, No. 31. pp. 11492-11497.
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