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Issue 16, 2015
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Vertical stratification and its impact on device performance in a polycarbazole based copolymer solar cells

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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.

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

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Publication details

The article was received on 15 Dec 2014, accepted on 10 Mar 2015 and first published on 11 Mar 2015


Article type: Paper
DOI: 10.1039/C4TC02884H
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Citation: J. Mater. Chem. C, 2015,3, 4007-4015
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    Vertical stratification and its impact on device performance in a polycarbazole based copolymer solar cells

    T. Wang, N. W. Scarratt, H. Yi, I. F. Coleman, Y. Zhang, R. T. Grant, J. Yao, M. W. A. Skoda, A. D. F. Dunbar, R. A. L. Jones, A. Iraqi and D. G. Lidzey, J. Mater. Chem. C, 2015, 3, 4007
    DOI: 10.1039/C4TC02884H

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