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Issue 6, 2014
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Linking morphology and performance of organic solar cells based on decacyclene triimide acceptors

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Abstract

Bulk heterojunction photovoltaic devices consisting of a novel non-fullerene acceptor based on a decacyclene triimide core and the common polymer donor poly(3-hexylthiophene) exhibit good power conversion efficiency (∼1.6%) as-cast. However, thermal annealing results in a drastic decrease in both the efficiency and the electron current. Polarized soft X-ray spectroscopy and grazing incidence X-ray scattering reveal that thermal annealing results in a reorientation of the acceptor molecules to an edge-on orientation with their π–π stacking direction predominantly in-plane with the substrate and overall hexagonal packing among planar columnar structures. This packing motif greatly hinders vertical electron transport in bulk heterojunction films. Furthermore, in situ X-ray scattering studies show that this critical reorientation occurs even at relatively low temperatures (∼60 °C). These results are some of the first to highlight differences between the morphology of non-fullerene and fullerene-based bulk heterojunctions and critical parameters that must be controlled when designing future high-performance non-fullerene acceptor molecules.

Graphical abstract: Linking morphology and performance of organic solar cells based on decacyclene triimide acceptors

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Publication details

The article was received on 22 Nov 2013, accepted on 28 Nov 2013 and first published on 16 Dec 2013


Article type: Paper
DOI: 10.1039/C3TA14839D
Citation: J. Mater. Chem. A, 2014,2, 1781-1789
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    Linking morphology and performance of organic solar cells based on decacyclene triimide acceptors

    G. M. Su, T. V. Pho, N. D. Eisenmenger, C. Wang, F. Wudl, E. J. Kramer and M. L. Chabinyc, J. Mater. Chem. A, 2014, 2, 1781
    DOI: 10.1039/C3TA14839D

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