Comparison of two types of vertically aligned ZnO NRs for highly efficient polymer solar cells

Authors

  • Irene Gonzalez-Valls,

    Corresponding author
    1. Centre de Investigació en Nanociencia i Nanotecnologia (CIN2-CSIC), Laboratory of Nanostructured Materials for Photovoltaic Energy, Campus UAB, Edifici ETSE 2nd Floor, Bellaterra (Barcelona), E-08193, Spain
    • Centre de Investigació en Nanociencia i Nanotecnologia (CIN2-CSIC), Laboratory of Nanostructured Materials for Photovoltaic Energy, Campus UAB, Edifici ETSE 2nd Floor, Bellaterra (Barcelona), E-08193, Spain
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  • Dechan Angmo,

    1. Department of Energy Conversion and Storage, Technical University of Denmark (DTU), Frederiksborgvej 399, DK-4000 Roskilde, Denmark
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  • Suren A. Gevorgyan,

    1. Department of Energy Conversion and Storage, Technical University of Denmark (DTU), Frederiksborgvej 399, DK-4000 Roskilde, Denmark
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  • Juan Sebastián Reparaz,

    1. Catalan Institute of Nanotechnology (ICN), Campus UAB, Bellaterra (Barcelona), E-08193, Spain
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  • Frederik C. Krebs,

    1. Department of Energy Conversion and Storage, Technical University of Denmark (DTU), Frederiksborgvej 399, DK-4000 Roskilde, Denmark
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  • Monica Lira-Cantu

    Corresponding author
    1. Centre de Investigació en Nanociencia i Nanotecnologia (CIN2-CSIC), Laboratory of Nanostructured Materials for Photovoltaic Energy, Campus UAB, Edifici ETSE 2nd Floor, Bellaterra (Barcelona), E-08193, Spain
    • Centre de Investigació en Nanociencia i Nanotecnologia (CIN2-CSIC), Laboratory of Nanostructured Materials for Photovoltaic Energy, Campus UAB, Edifici ETSE 2nd Floor, Bellaterra (Barcelona), E-08193, Spain
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Abstract

Vertically aligned ZnO nanorods (NR) are prepared by two different syntheses methods and applied on polymer solar cells (PSCs). The ZnO electrodes work as the electron transport layer with the P3HT:PCBM blend acting as the active material. Several organic blend solution conditions are optimized: concentration, solvent, and deposition speed. The effect of different NR electrode morphologies is analyzed on the solar cell performance and characterized by current–voltage curves and IPCE analyses. The photovoltaic performance of the solar cells was observed to be influenced by many factors, among them infiltration of the organic P3HT:PCBM blend within the ZnO NR layer. The infiltration of the active layer was monitored by cross section SEM and energy dispersive X-ray spectroscopy analyses. Our results show that higher power conversion efficiencies are achieved when shorter NRs lengths are applied. The best power conversion efficiency obtained was 2.0% for a 400 nm ZnO NR electrode. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2013

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