Neat C60:C70 buckminsterfullerene mixtures enhance polymer solar cell performance

Amaia Diaz De Zerio Mendaza, Jonas Bergqvist, Olof Bäcke, Camilla Lindqvist, Renee Kroon, Feng Gao, Mats R. Andersson, Eva Olsson, Olle W. Inganäs, Christian Müller

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)14354-14359
Number of pages6
JournalJournal of Materials Chemistry A
Issue number35
Publication statusPublished - 21 Sep 2014
Externally publishedYes


  • polymer solar cell performance
  • buckminsterfullerene mixtures
  • C60
  • C70
  • photovoltaic performance


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