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Formation of Well-Ordered Heterojunctions in Polymer: PCBM Photovoltaic Devices
University of Cambridge, England; University of Cambridge, England.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2582-1740
University of Cambridge, England.
University of Cambridge, England.
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2011 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 21, no 1, 139-146 p.Article in journal (Refereed) Published
Abstract [en]

The nanoscale morphology in polymer:PCBM based photovoltaic devices is a major contributor to overall device performance. The disordered nature of the phase-separated structure, in combination with the small length scales involved and the inherent difficulty of reproducing the exact morphologies when spin-coating and annealing thin blend films, have greatly hampered the development of a detailed understanding of how morphology impacts photo voltaic device functioning. In this paper we demonstrate a double nanoimprinting process that allows the formation of nanostructured polymer: PCBM heterojunctions of composition and morphology that can be selected independently. We fabricated photovoltaic (PV) devices with extremely high densities (10(14) mm(-2)) of interpenetrating nanoscale columnar features (as small as 25 nm; at or below the exciton diffusion length) in the active layer. By comparing device results of different feature sizes and two different polymer: PCBM combinations, we demonstrate how double imprinting can be a powerful tool to systematically study different parameters in polymer photovoltaic devices.

Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2011. Vol. 21, no 1, 139-146 p.
National Category
Nano Technology
URN: urn:nbn:se:liu:diva-115694DOI: 10.1002/adfm.201000573ISI: 000285723000015OAI: diva2:796101

Funding Agencies|Engineering and Physical Science Research Council; Gates Cambridge Trust

Available from: 2015-03-18 Created: 2015-03-18 Last updated: 2015-03-31

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Gao, Feng
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