Efficient small molecule bulk heterojunction solar cells with high fill factors via pyrene-directed molecular self-assembly.
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.
Department of Chemistry, University of California Berkeley, 94720-1460, USA.
Olivia P
OP
Lee
Alan T
AT
Yiu
Pierre M
PM
Beaujuge
Claire H
CH
Woo
Thomas W
TW
Holcombe
Jill E
JE
Millstone
Jessica D
JD
Douglas
Mark S
MS
Chen
Jean M J
JM
Fréchet
D018360:Crystallography, X-Ray; D011211:Electric Power Supplies; D011721:Pyrenes / Q000737:chemistry*; D013472:Sunlight
D011721:Pyrenes; C030984:pyrene