Influence of the Bridging Atom on the Performance of a Low-Bandgap Bulk Heterojunction Solar Cell (pages 367–370)
Markus C. Scharber, Markus Koppe, Jia Gao, Fabrizio Cordella, Maria. A. Loi, Patrick Denk, Mauro Morana, Hans-Joachim Egelhaaf, Karen Forberich, Gilles Dennler, Russ Gaudiana, Dave Waller, Zhengguo Zhu, Xiaobo Shi and Christoph J. Brabec
Article first published online: 15 AUG 2009 | DOI: 10.1002/adma.200900529
Replacing a carbon atom with silicon (see figure) on the main chain of a conjugated polythiophene gives a polysilole with higher crystallinity, improved charge transport, reduced bimolecular recombination, and reduced formation of charge transfer complexes when blended with a fullerene derivative. Optimized bulk heterojunction solar cells using this blend give certified efficiencies of 5.2% under AM1.5 illumination.