Origin of size effect on efficiency of organic photovoltaics

Assaf Manor, Eugene A. Katz, Thomas Tromholt, Baruch Hirsch, Frederik C Krebs

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    Abstract

    It is widely accepted that efficiency of organic solar cells could be limited by their size. However, the published data on this effect are very limited and none of them includes analysis of light intensity dependence of the key cell parameters. We report such analysis for bulk heterojunction solar cells of various sizes and suggest that the origin of both the size and the light intensity effects should include underlying physical mechanisms other than conventional series resistance dissipation. In particular, we conclude that the distributed nature of the ITO resistance and its influence on the voltage dependence of photocurrent and dark current is the key to understanding size limitation of the organic photovoltaics (OPV) efficiency. Practical methods to overcome this limitation as well as the possibility of producing concentrator OPV cells operating under sunlight concentrations higher than 10 suns are discussed. (C) 2011 American Institute of Physics. [doi:10.1063/1.3567930]
    Original languageEnglish
    JournalJournal of Applied Physics
    Volume109
    Issue number7
    Pages (from-to)074508
    ISSN0021-8979
    DOIs
    Publication statusPublished - 2011

    Bibliographical note

    Copyright (2011) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

    This work was performed, in part, in the framework of
    the “Largecells” project that received funding from the European
    Commission’s Seventh Framework Programme (FP7/
    2007-2013) under Grant Agreement No. 261936.” T.T. and
    F.C.K. thank the Danish Strategic Research Council (2104-
    07-0022) and EUDP (j. nr. 64009-0050) for financial support.
    E.A.K. acknowledges financial support by the FIRST -
    Focal Initiatives in Science and Technology foundation of
    the Israel Science Foundation (grant no. 1004/07).

    Keywords

    • Polymer solar cells

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