Improving Cathodes with a Polymer Interlayer in Reversed Organic Solar Cells.

Zheng Tang, Wolfgang Tress, Qinye Bao, Mohammad Jarari, Jonas Bergqvist, Thomas Ederth, Mats R. Andersson, Olle Inganas

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    27 Citations (Scopus)

    Abstract

    The effects of cathode modification by a conjugated polymer interlayer PFPA1 on the performance of reversed organic solar cells (substrate/cathode/active layer/transparent anode) based on different active material systems and different substrate electrodes are systematically investigated. A reduction of the work function irrespective of the substrate cathode used is observed upon the deposition of the PFPA1 interlayer, which is further related to an improved built-in electric field and open-circuit voltage. The amphiphilic character of the PFPA1 interlayer alters the surface energy of the substrate cathode, leading to the formation of a better active layer morphology aiding efficient exciton dissociation and photocurrent extraction in the modified solar cells. Hence, internal quantum efficiency is found to be significantly higher than that of their unmodified counterparts, while optically, the modified and unmodified solar cells are identical. Moreover, the deep highest occupied molecular orbital (HOMO) of the PFPA1 interlayer improves the selectivity for all investigated substrate cathodes, thus enhancing the fill factor.

    Original languageEnglish
    Article number1400643
    Pages (from-to)Art: 1400643
    Number of pages12
    JournalAdvanced Energy Materials
    Volume4
    Issue number15
    DOIs
    Publication statusPublished - 2014

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  • Cite this

    Tang, Z., Tress, W., Bao, Q., Jarari, M., Bergqvist, J., Ederth, T., Andersson, M. R., & Inganas, O. (2014). Improving Cathodes with a Polymer Interlayer in Reversed Organic Solar Cells. Advanced Energy Materials, 4(15), Art: 1400643. [1400643]. https://doi.org/10.1002/aenm.201400643