Efficient Small Molecule Bulk Heterojunction Solar Cells with High Fill Factors via Pyrene-Directed Molecular Self-Assembly

✍ Scribed by Olivia P. Lee; Alan T. Yiu; Pierre M. Beaujuge; Claire H. Woo; Thomas W. Holcombe; Jill E. Millstone; Jessica D. Douglas; Mark S. Chen; Jean M. J. Fréchet

• Book ID: 101424443
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 424 KB
• Volume: 23
• Category: Article
• ISSN: 0935-9648
• DOI: 10.1002/adma.201103177

✦ Synopsis

Efficient organic photovoltaic (OPV) materials are constructed by attaching completely planar, symmetric end-groups to donor-acceptor electroactive small molecules. Appending C2-pyrene as the small molecule end-group to a diketopyrrolopyrrole core leads to materials with a tight, aligned crystal packing and favorable morphology dictated by π-π interactions, resulting in high power conversion efficiencies and high fill factors. The use of end-groups to direct molecular self-assembly is an effective strategy for designing high-performance small molecule OPV devices.