Bimolecular Crystals of Fullerenes in Conjugated Polymers and the Implications of Molecular Mixing for Solar Cells (pages 1173–1179)
A. C. Mayer, Michael F. Toney, Shawn R. Scully, Jonathan Rivnay, Christoph J. Brabec, Marcus Scharber, Marcus Koppe, Martin Heeney, Iain McCulloch and Michael D. McGehee
Article first published online: 2 MAR 2009 | DOI: 10.1002/adfm.200801684
A highly ordered bimolecular crystal forms when a fullerene molecule intercalates between the side-chains of a semi-crystalline polymer (see figure). This unexpected intercalation is observed in several polymer:fullerene blends and suggested for several others. Rational design of polymers for bulk heterojunction solar cells must consider this effect in order to push the efficiency higher.