Neat C60:C70 buckminsterfullerene mixtures enhance polymer solar cell performance
2014 (English)In: Journal of Materials Chemistry A, ISSN 2050-7496, Vol. 2, no 35, 14354-14359 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
Royal Society of Chemistry, 2014. Vol. 2, no 35, 14354-14359 p.
IdentifiersURN: urn:nbn:se:liu:diva-109970DOI: 10.1039/c4ta02515fISI: 000340768000008ScopusID: 2-s2.0-84906087536OAI: oai:DiVA.org:liu-109970DiVA: diva2:746245