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Title
Neat C60:C70 buckminsterfullerene mixtures enhance polymer solar cell performance
Article in journal
Authors
De Zerio Mendaza A. Diaz, Jonas Bergqvist, O. Backe, C. Lindqvist, R. Kroon, Feng Gao, M.R. Andersson, E. Olsson, Olle Inganäs, C. Muller
Publication Year
2014
Source
Journal of Materials Chemistry A, 2014, (2)35, 14354-14359
Link to Source (DOI)
10.1039/c4ta02515f
Abstract
<p>We demonstrate that bulk-heterojunction blends based on neat, unsubstituted buckminsterfullerenes (C60, C70) and a thiophene-quinoxaline copolymer (TQ1) can be readily processed from solution. Atomic force and transmission electron microscopy as well as photoluminescence spectroscopy reveal that thin films with a fine-grained nanostructure can be spin-coated, which display a good photovoltaic performance. Replacement of substituted fullerenes with C60 or C70 only results in a small drop in open-circuit voltage from 0.9 V to about 0.8 V. Thus, a power conversion efficiency of up to 2.9% can be maintained if C70 is used as the acceptor material. Further improvement in photovoltaic performance to 3.6% is achieved, accompanied by a high internal quantum efficiency of 75%, if a 1:1 C60:C70 mixture is used as the acceptor material, due to its improved solubility in ortho-dichlorobenzene. © the Partner Organisations 2014.</p>