Photovoltaic charge generation in organic semiconductors based on long-range energy transfer

David C. Coffey, Andrew J. Ferguson, Nikos Kopidakis, Gary Rumbles

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

For efficient charge generation in organic solar cells, photogenerated excitons must migrate to a donor/acceptor interface where they can be dissociated. This migration is traditionally presumed to be based on diffusion through the absorber material. Herein we study an alternative migration route-two-step exciton dissociation-whereby the exciton jumps from the donor to acceptor before charge creation takes place. We study this process in a series of multilayer donor/barrier/acceptor samples, where either poly(3- hexylthiophene) (P3HT) or copper phthalocyanine (CuPc) is the donor, fullerene (C60) is the acceptor, and N,N-diphenyl-N,N-bis(3-methylphenyl)-[1,1- bisphenyl]-4,4-diamine (TPD) acts as a barrier to energy transfer. By varying the thickness of the barrier layer, we find that energy transfer from P3HT to C60 proceeds over large distances (∼50% probability of transfer across a 11 nm barrier), and that this process is consistent with long-range Förster resonance energy transfer (FRET). Finally, we demonstrate a fundamentally different architecture concept that utilizes the two-step mechanism to enhance performance in a series of P3HT/CuPc/C60 devices.

Original languageEnglish
Pages (from-to)5437-5445
Number of pages9
JournalACS Nano
Volume4
Issue number9
DOIs
Publication statusPublished - Sep 28 2010

Fingerprint

Semiconducting organic compounds
organic semiconductors
Excitons
Energy transfer
energy transfer
excitons
absorbers (materials)
Diamines
Temperature programmed desorption
barrier layers
Fullerenes
diamines
fullerenes
Multilayers
solar cells
routes
dissociation
Copper
copper
LDS 751

Keywords

  • charge transfer
  • energy transfer
  • Förster
  • FRET
  • microwave conductivity
  • organic semiconductor
  • photovoltaic
  • solar cell

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Photovoltaic charge generation in organic semiconductors based on long-range energy transfer. / Coffey, David C.; Ferguson, Andrew J.; Kopidakis, Nikos; Rumbles, Gary.

In: ACS Nano, Vol. 4, No. 9, 28.09.2010, p. 5437-5445.

Research output: Contribution to journalArticle

Coffey, David C. ; Ferguson, Andrew J. ; Kopidakis, Nikos ; Rumbles, Gary. / Photovoltaic charge generation in organic semiconductors based on long-range energy transfer. In: ACS Nano. 2010 ; Vol. 4, No. 9. pp. 5437-5445.
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