Prolonging charge separation in P3HT-SWNT composites using highly enriched semiconducting nanotubes

Josh M. Holt, Andrew J. Ferguson, Nikos Kopidakis, Brian A. Larsen, Justin Bult, Garry Rumbles, Jeffrey L. Blackburn

Research output: Contribution to journalArticlepeer-review

99 Citations (Scopus)

Abstract

Single-walled carbon nanotubes (SWNTs) have potential as electron acceptors in organic photovoltaics (OPVs), but the currently low-power conversion efficiencies of devices remain largely unexplained. We demonstrate effective redispersion of isolated, highly enriched semiconducting and metallic SWNTs into poly(3-hexylthiophene) (P3HT). We use these enriched blends to provide the first experimental evidence of the negative impact of metallic nanotubes. Time-resolved microwave conductivity reveals that the long-lived carrier population can be significantly increased by incorporating highly enriched semiconducting SWNTs into semiconducting polymer composites.

Original languageEnglish
Pages (from-to)4627-4633
Number of pages7
JournalNano Letters
Volume10
Issue number11
DOIs
Publication statusPublished - 10 Nov 2010
Externally publishedYes

Keywords

  • charge generation
  • charge recombination
  • organic photovoltaic
  • P3HT
  • polythiophene
  • Single-walled carbon nanotubes
  • time-resolved microwave conductivity

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