Self-assembled monolayers as interfaces for organic opto-electronic devices

L. Zuppiroli, L. Si-Ahmed, K. Kamaras, F. Nüesch, M. N. Bussac, D. Ades, A. Siove, E. Moons, M. Grätzel

Research output: Contribution to journalArticle

148 Citations (Scopus)

Abstract

Charge injection into an organic semiconductor can be improved by using a self-assembled monolayer of functionalized molecules grafted on the electrode. This new interface can be designed in order to reduce the Schottky barrier between the conductive electrode and the organic semiconductor. The polarizability of the molecules involved can also be chosen in order to increase the adhesion of the molecular semiconductor onto the electrode. We present Kelvin Probe experiments and saturated photovoltage measurements performed on a number of such derivatized electrodes. They permit a quantitative description of the potential shifts due to the self-assembled monolayers which are related to the electrical dipoles of the individual molecules constituting them. When conjugated sites contributing to the band states of the organic semiconductor are placed too close to the electrode in the negative part of the image-force potential, two new effects unfavorable to charge injection can appear. We demonstrate that it is convenient to separate the attachment group of the molecule from the conjugated core by a spacer of non-conjugated sites in order to reduce these undesirable effects.

Original languageEnglish
Pages (from-to)505-512
Number of pages8
JournalEuropean Physical Journal B
Volume11
Issue number3
Publication statusPublished - Oct 1 1999

Fingerprint

Self assembled monolayers
optoelectronic devices
Optoelectronic devices
Semiconducting organic compounds
organic semiconductors
Electrodes
electrodes
Charge injection
Molecules
molecules
injection
photovoltages
spacers
attachment
adhesion
Adhesion
Semiconductor materials
dipoles
probes
shift

Keywords

  • 73.30.+y Surface double layers, Schottky barriers, and work functions
  • 73.61.Ph Polymers; organic compounds

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Zuppiroli, L., Si-Ahmed, L., Kamaras, K., Nüesch, F., Bussac, M. N., Ades, D., ... Grätzel, M. (1999). Self-assembled monolayers as interfaces for organic opto-electronic devices. European Physical Journal B, 11(3), 505-512.

Self-assembled monolayers as interfaces for organic opto-electronic devices. / Zuppiroli, L.; Si-Ahmed, L.; Kamaras, K.; Nüesch, F.; Bussac, M. N.; Ades, D.; Siove, A.; Moons, E.; Grätzel, M.

In: European Physical Journal B, Vol. 11, No. 3, 01.10.1999, p. 505-512.

Research output: Contribution to journalArticle

Zuppiroli, L, Si-Ahmed, L, Kamaras, K, Nüesch, F, Bussac, MN, Ades, D, Siove, A, Moons, E & Grätzel, M 1999, 'Self-assembled monolayers as interfaces for organic opto-electronic devices', European Physical Journal B, vol. 11, no. 3, pp. 505-512.
Zuppiroli L, Si-Ahmed L, Kamaras K, Nüesch F, Bussac MN, Ades D et al. Self-assembled monolayers as interfaces for organic opto-electronic devices. European Physical Journal B. 1999 Oct 1;11(3):505-512.
Zuppiroli, L. ; Si-Ahmed, L. ; Kamaras, K. ; Nüesch, F. ; Bussac, M. N. ; Ades, D. ; Siove, A. ; Moons, E. ; Grätzel, M. / Self-assembled monolayers as interfaces for organic opto-electronic devices. In: European Physical Journal B. 1999 ; Vol. 11, No. 3. pp. 505-512.
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