Hybrid Solar Cells from Regioregular Polythiophene and ZnO Nanoparticles

Authors

  • W. J. E. Beek,

    1. Molecular Materials and Nanosystems, Departments of Chemical Engineering & Chemistry and Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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  • M. M. Wienk,

    1. Molecular Materials and Nanosystems, Departments of Chemical Engineering & Chemistry and Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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  • R. A. J. Janssen

    1. Molecular Materials and Nanosystems, Departments of Chemical Engineering & Chemistry and Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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  • This work is supported by the Council for Chemical Sciences of the Netherlands Organization for Scientific Research (CW-NWO) in the Pionier program and forms part of the research program of the Dutch Polymer Institute (DPI, project 324).

Abstract

Blends of nanocrystalline zinc oxide nanoparticles (nc-ZnO) and regioregular poly(3-hexylthiophene) (P3HT) processed from solution have been used to construct hybrid polymer–metal oxide bulk-heterojunction solar cells. Thermal annealing of the spin-cast films significantly improves the solar-energy conversion efficiency of these hybrid solar cells to ∼ 0.9 %. Photoluminescence and photoinduced absorption spectroscopy demonstrate that charge-carrier generation is not quantitative, because a fraction of P3HT appears not to be in contact with or in close proximity to ZnO. The coarse morphology of the films, also identified by tapping-mode atomic force microscopy, likely limits the device performance.

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