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    Figures of Merit Guiding Research on Organic Solar Cells

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    Type
    Article
    Authors
    Kirchartz, Thomas
    Kaienburg, Pascal
    Baran, Derya cc
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2018-03-02
    Online Publication Date
    2018-03-02
    Print Publication Date
    2018-03-22
    Permanent link to this record
    http://hdl.handle.net/10754/627449
    
    Metadata
    Show full item record
    Abstract
    While substantial progress in the efficiency of polymer-based solar cells was possible by optimizing the energy levels of the polymer and more recently also the acceptor molecule, further progress beyond 10% efficiency requires a number of criteria to be fulfilled simultaneously, namely, low energy-level offsets at the donor–acceptor heterojunction, low open-circuit voltage losses due to nonradiative recombination, and efficient charge transport and collection. In this feature article we discuss these criteria considering thermodynamic limits, their correlation to photocurrent and photovoltage, and effects on the fill factor. Each criterion is quantified by a figure of merit (FOM) that directly relates to device performance. To ensure a wide applicability, we focus on FOMs that are easily accessible from common experiments. We demonstrate the relevance of these FOMs by looking at the historic and recent achievements of organic solar cells. We hope that the presented FOMs are or will become a valuable tool to evaluate, monitor, and guide further development of new organic absorber materials for solar cells.
    Citation
    Kirchartz T, Kaienburg P, Baran D (2018) Figures of Merit Guiding Research on Organic Solar Cells. The Journal of Physical Chemistry C 122: 5829–5843. Available: http://dx.doi.org/10.1021/acs.jpcc.8b01598.
    Sponsors
    T.K. acknowledges support from the DFG (Grant No. KI-1571/2-1). D.B. thanks the Helmholtz Association for a Helmholtz Postdoctoral Fellowship. We thank J. Benduhn and K. Vandewal for sharing the data presented in Figure 4b.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.8b01598
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.jpcc.8b01598
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.jpcc.8b01598
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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