On the role of intermixed phases in organic photovoltaic blends

Paul Westacott, John R. Tumbleston, Safa Shoaee, Sarah Fearn, James H. Bannock, James B. Gilchrist, Sandrine Heutz, John Demello, Martin Heeney, Harald Ade, James Durrant, David S. McPhail, Natalie Stingelin

Research output: Contribution to journalArticlepeer-review

163 Scopus citations

Abstract

Recently, an intermixed phase has been identified within organic photovoltaic (OPV) bulk heterojunction (BHJ) systems that can exist in addition to relatively phase-pure regions, highlighting the need for a refined picture of the solid-state microstructure of donor-acceptor blends and for gaining further understanding of the exact nature and role such intermixed phases play in such devices. Here we manipulate the microstructure of polymer-fullerene systems via processing means and the selection of the molecular weight of the donor polymer. This manipulation is used as a tool to vary the fraction of intermixed phase present and its effects on the structure and subsequently the opto-electronic processes. We find clear relationships between the state of mixing and amount of exciton quenching and number of polarons generated per absorbed photon. Furthermore, we observe that blend systems incorporating higher molecular weight polymer result in a greater yield of dissociated polarons, likely due to the increase of the intermixed fraction. © 2013 The Royal Society of Chemistry.
Original languageEnglish (US)
Pages (from-to)2756-2764
Number of pages9
JournalEnergy and Environmental Science
Volume6
Issue number9
DOIs
StatePublished - Sep 1 2013
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-02-14

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Nuclear Energy and Engineering
  • Renewable Energy, Sustainability and the Environment

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