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

doi:10.1039/c3ee41821a

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 journal › Article › peer-review

164 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 language	English (US)
Pages (from-to)	2756-2764
Number of pages	9
Journal	Energy and Environmental Science
Volume	6
Issue number	9
DOIs	https://doi.org/10.1039/c3ee41821a
State	Published - Sep 1 2013
Externally published	Yes

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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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10.1039/c3ee41821a

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title = "On the role of intermixed phases in organic photovoltaic blends",

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. {\textcopyright} 2013 The Royal Society of Chemistry.",

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AU - Westacott, Paul

AU - Tumbleston, John R.

AU - Shoaee, Safa

AU - Fearn, Sarah

AU - Bannock, James H.

AU - Gilchrist, James B.

AU - Heutz, Sandrine

AU - Demello, John

AU - Heeney, Martin

AU - Ade, Harald

AU - Durrant, James

AU - McPhail, David S.

AU - Stingelin, Natalie

N1 - Generated from Scopus record by KAUST IRTS on 2023-02-14

PY - 2013/9/1

Y1 - 2013/9/1

N2 - 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.

AB - 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.

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On the role of intermixed phases in organic photovoltaic blends

Abstract

Bibliographical note

ASJC Scopus subject areas

UN SDGs

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