Vertical stratification and its impact on device performance in a polycarbazole based copolymer solar cells

Abstract

Using neutron-reflectivity, we study vertical stratification and device performance in bulk hetero-junction organic photovoltaic (OPV) cells consisting of a blend of PC71BM with a carbazole-based donor–acceptor copolymer PCDTBT1. We find that when the blend is cast on a PEDOT:PSS/ITO anode, a PC71BM-depleted (polymer-rich) layer is formed at the PEDOT:PSS interface, whilst a PC71BM-depleted layer is instead located at the air-interface when the same blend is cast on a solution processed MoOx thin film. OPV device characterization measurements indicate that unfavourable vertical segregation can have a profound effect on OPV device characteristics via increased charge recombination.

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Item Type:	Article
Authors/Creators:	Wang, T. Scarratt, N.W. Yi, H. Coleman, I.F. Zhang, Y. Grant, R.T. Yao, J. Skoda, M.W.A. Dunbar, A.D.F. https://orcid.org/0000-0002-2313-4234 Jones, R.A.L. https://orcid.org/0000-0001-5400-6369 Iraqi, A. https://orcid.org/0000-0003-3060-6663 Lidzey, D.G. https://orcid.org/0000-0002-8558-1160
Copyright, Publisher and Additional Information:	© 2015 The Royal Society of Chemistry. This is an author produced version of a paper subsequently published in the Journal of Materials Chemistry C. Uploaded in accordance with the publisher's self-archiving policy.
Dates:	Accepted: 10 March 2015 Published (online): 11 March 2015 Published: 28 April 2015
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Chemical and Biological Engineering (Sheffield) The University of Sheffield > Faculty of Science (Sheffield) > Department of Chemistry (Sheffield) The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Funding Information:	Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/I028641/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) UNSPECIFIED
Depositing User:	Symplectic Sheffield
Date Deposited:	04 Oct 2016 14:07
Last Modified:	22 Mar 2018 20:50
Published Version:	http://dx.doi.org/10.1039/C4TC02884H
Status:	Published
Publisher:	Royal Society of Chemistry
Refereed:	Yes
Identification Number:	10.1039/C4TC02884H
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:105439

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Vertical stratification and its impact on device performance in a polycarbazole based copolymer solar cells

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