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    Characterization of the polymer energy landscape in polymer:fullerene bulk heterojunctions with pure and mixed phases

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    Type
    Article
    Authors
    Sweetnam, Sean
    Graham, Kenneth
    Ngongang Ndjawa, Guy Olivier cc
    Heumüller, Thomas
    Bartelt, Jonathan A.
    Burke, Timothy M.
    Li, Wentao
    You, Wei
    Amassian, Aram cc
    McGehee, Michael D.
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Organic Electronics and Photovoltaics Group
    Physical Science and Engineering (PSE) Division
    Date
    2014-09-29
    Online Publication Date
    2014-09-29
    Print Publication Date
    2014-10-08
    Permanent link to this record
    http://hdl.handle.net/10754/563791
    
    Metadata
    Show full item record
    Abstract
    Theoretical and experimental studies suggest that energetic offsets between the charge transport energy levels in different morphological phases of polymer:fullerene bulk heterojunctions may improve charge separation and reduce recombination in polymer solar cells (PSCs). In this work, we use cyclic voltammetry, UV-vis absorption, and ultraviolet photoelectron spectroscopy to characterize hole energy levels in the polymer phases of polymer:fullerene bulk heterojunctions. We observe an energetic offset of up to 150 meV between amorphous and crystalline polymer due to bandgap widening associated primarily with changes in polymer conjugation length. We also observe an energetic offset of up to 350 meV associated with polymer:fullerene intermolecular interactions. The first effect has been widely observed, but the second effect is not always considered despite being larger in magnitude for some systems. These energy level shifts may play a major role in PSC performance and must be thoroughly characterized for a complete understanding of PSC function.
    Citation
    Sweetnam, S., Graham, K. R., Ngongang Ndjawa, G. O., Heumüller, T., Bartelt, J. A., Burke, T. M., … McGehee, M. D. (2014). Characterization of the Polymer Energy Landscape in Polymer:Fullerene Bulk Heterojunctions with Pure and Mixed Phases. Journal of the American Chemical Society, 136(40), 14078–14088. doi:10.1021/ja505463r
    Sponsors
    This publication was based on work supported by the Center for Advanced Molecular Photovoltaics (CAMP) (award no. KUS-C1-01S-21), made possible by KAUST. S.S. acknowledges support from the National Science Foundation through the National Science Foundation Graduate Research Fellowship under grant no. DGE-114747 and support from Stanford University through a Benchmark Stanford Graduate Fellowship. K.R.G and A.A. acknowledge SABIC for a postdoctoral fellowship. G.O.N.N., K.R.G, M.D.M., and A.A. acknowledge the Office of Competitive Research Funds for a GRP-CF award. T.H. gratefully acknowledges a "DAAD Doktorantenstipendium" and the SFB 953 "Synthetic Carbon Allotropes". J.A.B. acknowledges government support by the Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program. We thank the group of Martin Heeney for providing the pBTTT used for this study and William R. Mateker for his assistance with manuscript preparation.
    Publisher
    American Chemical Society (ACS)
    Journal
    Journal of the American Chemical Society
    DOI
    10.1021/ja505463r
    ae974a485f413a2113503eed53cd6c53
    10.1021/ja505463r
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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