Formation of Well-Ordered Heterojunctions in Polymer: PCBM Photovoltaic Devices
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
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.
IdentifiersURN: urn:nbn:se:liu:diva-115694DOI: 10.1002/adfm.201000573ISI: 000285723000015OAI: oai:DiVA.org:liu-115694DiVA: diva2:796101
Funding Agencies|Engineering and Physical Science Research Council; Gates Cambridge Trust2015-03-182015-03-182015-03-31