Efficient small molecule bulk heterojunction solar cells with high fill factors via pyrene-directed molecular self-assembly |
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Authors: | Lee Olivia P Yiu Alan T Beaujuge Pierre M Woo Claire H Holcombe Thomas W Millstone Jill E Douglas Jessica D Chen Mark S Fréchet Jean M J |
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Affiliation: | Department of Chemistry, University of California Berkeley, 94720-1460, USA. |
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Abstract: | 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. |
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Keywords: | self‐assembly pyrene organic photovoltaics donor‐acceptor small molecules |
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