Elsevier

Synthetic Metals

Volume 77, Issues 1–3, February 1996, Pages 277-280
Synthetic Metals

Exciton dissociation at a poly(p-phenylenevinylene)/C60 heterojunction

https://doi.org/10.1016/0379-6779(96)80102-0Get rights and content

Abstract

We report measurements of the photovoltaic effect in heterojunction structures consisting of a layer of C60 thermally evaporated onto a film of the conjugated polymer poly(p-phenylenevinylene) (PPV) sandwiched between electrodes of indium-tin oxide and Al. Peak quantum efficiencies of up to about 9% (electrons collected per incident photon) were measured under short-circuit conditions, with corresponding open-circuit voltages approaching 0.9 V. Increased quantum yields were obtained under forward and reverse biases. We model the response as arising from the dissociation of photogenerated excitons at the PPV/C60 interface, with electron transfer to the C60. The C60 layer acts as a dielectric spacer, providing a constructive enhancement of the optical fields at the PPV/C60 interface. We have applied this model to estimate an exciton diffusion range of 60 to 80 Å.

References (14)

  • H. Antoniadis et al.

    Synth. Met.

    (1994)
  • N.S. Sariciftci et al.

    Synth. Met.

    (1993)
  • R.N. Marks et al.

    J. Phys.: Condens. Matter

    (1994)
  • G. Yu et al.

    Appl. Phys. Lett.

    (1994)
  • G. Yu et al.

    Appl. Phys. Lett.

    (1994)
  • R.H. Friend et al.

    J. Appl. Phys.

    (1987)
  • C.W. Tang

    Appl. Phys. Lett.

    (1986)
There are more references available in the full text version of this article.

Cited by (0)

1

Cambridge Display Technology, 131a Huntingdon Road, Cambridge CB2 3RA, UK.

View full text