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      Trimolecular recombination in polythiophene: fullerene bulk heterojunction solar cells

      , , , ,
      Applied Physics Letters
      AIP Publishing

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          A review of charge transport and recombination in polymer/fullerene organic solar cells

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            Experimental determination of the rate law for charge carrier decay in a polythiophene: Fullerene solar cell

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              Bimolecular Recombination Coefficient as a Sensitive Testing Parameter for Low-Mobility Solar-Cell Materials

              Bimolecular charge carrier recombination has been clarified in bulk-heterojunction solar cells based on a blend of regioregular poly(3-hexylthiophene) and 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-methanofullerene using the time-of-flight method. We show how bimolecular recombination influences the charge carrier transport, how it limits the efficiency of low-mobility solar cells, and how to estimate the bimolecular recombination coefficient. We found that bimolecular recombination in these efficient photovoltaic materials is orders of magnitude slower as compared to Langevin recombination expected for low-mobility materials. This effect is inherent to the nanomorphology of the bicontinuous interpenetrating network creating separate pathways for electrons and holes, and paves the way for the fabrication of bulk-heterojunction solar cells where bimolecular recombination is not the limiting factor.
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                Author and article information

                Journal
                Applied Physics Letters
                Appl. Phys. Lett.
                AIP Publishing
                0003-6951
                1077-3118
                October 06 2008
                October 06 2008
                : 93
                : 14
                : 143303
                Article
                10.1063/1.2996588
                68100ffd-f3c0-4d48-bee4-df1cc0c341cb
                © 2008
                History

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