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    Tailor-Made Additives for Morphology Control in Molecular Bulk-Heterojunction Photovoltaics

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    Type
    Article
    Authors
    Graham, Kenneth R.
    Stalder, Romain
    Wieruszewski, Patrick M.
    Patel, Dinesh G.
    Salazar, Danielle H.
    Reynolds, John R.
    Date
    2012-12-24
    Online Publication Date
    2012-12-24
    Print Publication Date
    2013-01-09
    Permanent link to this record
    http://hdl.handle.net/10754/599858
    
    Metadata
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    Abstract
    Tailor-made additives, which are molecules that share the same molecular structure as a parent molecule with only slight structural variations, have previously been demonstrated as a useful means to control crystallization dynamics in solution. For example, tailor-made additives can be added to solutions of a crystallizing parent molecule to alter the crystal growth rate, size, and shape. We apply this strategy as a means to predictably control morphology in molecular bulk-heterojunction (BHJ) photovoltaic cells. Through the use of an asymmetric oligomer substituted with a bulky triisobutylsilyl end group, the morphology of BHJ blends can be controlled resulting in a near doubling (from 1.3 to 2.2%) in power conversion efficiency. The use of tailor-made additives provides promising opportunities for controlling crystallization dynamics, and thereby film morphologies, for many organic electronic devices such as photovoltaics and field-effect transistors. © 2012 American Chemical Society.
    Citation
    Graham KR, Stalder R, Wieruszewski PM, Patel DG, Salazar DH, et al. (2013) Tailor-Made Additives for Morphology Control in Molecular Bulk-Heterojunction Photovoltaics. ACS Applied Materials & Interfaces 5: 63–71. Available: http://dx.doi.org/10.1021/am301944g.
    Sponsors
    We gratefully acknowledge the AFOSR (FA9550-09-1-0320) for financial support. K.R.G. and R.S. acknowledge the University Alumni Awards Program for a fellowship. We acknowledge the Major Analytical Instrumentation Center, Department of Materials Science and Engineering, University of Florida, for TEM and FIB facility use. We thank Prof. Baskar Ganapathysubramanian (Iowa State University) and Prof. Aram Amassian (King Abdullah University of Science and Technology) for suggestions on TEM image processing.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Applied Materials & Interfaces
    DOI
    10.1021/am301944g
    PubMed ID
    23206429
    ae974a485f413a2113503eed53cd6c53
    10.1021/am301944g
    Scopus Count
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