Cyclic potential growth mechanism for electropolymerized polythiophenes as anode buffer layers in P3HT–PCBM solar cells

Authors

  • Sidhant Bom,

    1. Research Center of Functional Materials and Nanomolecular Science, School of Engineering and Science, Jacobs University Bremen, Bremen, Germany
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  • Marlis Ortel,

    1. Research Center of Functional Materials and Nanomolecular Science, School of Engineering and Science, Jacobs University Bremen, Bremen, Germany
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  • Veit Wagner

    Corresponding author
    1. Research Center of Functional Materials and Nanomolecular Science, School of Engineering and Science, Jacobs University Bremen, Bremen, Germany
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Abstract

A new method for electropolymerization of polythiophenes as anode buffer layer in combination with a PEDOT:PSS buffer in P3HT–PCBM solar cells is introduced. This approach uses a stack of PEDOT:PSS and electropolymerized polythiophene (ePT) as an anode buffer layer. A significant improvement in the short circuit current is seen in solar cells with additional thin buffer layers of ePT grown on top of PEDOT:PSS. The cells with ePT buffer layer grown with constant potential mode compared to solar cells without additional ePT buffer layer have an 18.7% increase in power conversion efficiency. However, the cells with ePT grown with cyclic potential mode result in an additional enhancement in short circuit current with a further increase of 11.7% in power conversion efficiency. This improvement is attributed to better quality of the buffer layer obtained by cyclic potential electropolymerization technique with respect to film quality and area coverage. pssa201431059-gra-0001

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