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Author: Wiel, B. van der ×

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Now showing 1 - 3 of 3
  • Publication
    Production of low cost encapsulation materials on weatherable substrates
    ( 2015)
    Kucukplnar, E.
    ;
    Kiese, S.
    ;
    Miesbauer, O.
    ;
    Noller, K.
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    Amberg-Schwab, S.
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    Lohwasser, W.
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    Vacca, P.
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    MacDonald, B.
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    Meier, S.
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    Wiel, B. van der
    ;
    Schilinsky, P.
  • Publication
    Market readiness of organic photovoltaics for building integration
    ( 2014)
    Wiel, B. van der
    ;
    Egelhaaf, H.-J.
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    Issa, H.
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    Roos, M.
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    Henze, N.
    If a photovoltaic (PV) technology is assessed today in a technical framework, then efficiency is the most commonly addressed parameter, followed by service lifetime. Cost, as the third parameter of the "magic triangle", is even less often reported. However, if a new technology is prepared to enter a market, other important parameters have to be considered, especially if non-standard PV applications are targeted. Organic photovoltaic (OPV) is a well known but young PV technology of the so called third generation, which offers unique advantages for integrated products such as building integrated photovoltaics (BIPV). In this contribution we would like to highlight some of the advantages and challenges which are specific to the application of OPV in the field of building integration. Architectural design features of OPV include the ability to adapt semi-transparency, color and shape of the module. Moreover, glass-laminated OPV modules are deemed suitable for BIPV because of their ease of integration, good fire resistance, high energy harvest per nominal watt-peak and long lifetimes.
  • Publication
    The influence of doping on the performance of organic bulk heterojunction solar cells
    ( 2006)
    Glatthaar, Markus
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    Mingirulli, Nicola
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    Zimmermann, Birger
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    Clement, Florian
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    Riede, M.
    ;
    Wiel, B. van der
    ;
    Niggemann, M.
    ;
    Gombert, Andreas
    We investigated organic bulk-heterojunction solar cells based on an absorber blend of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) by electrical impedance spectroscopy (EIS). A strong neck in the modulus plot of the EIS-spectra indicates that the absorber is divided into two regions of different conductivities. A similar behaviour was observed for pure P3HT-diodes. Hence, it can be concluded that the PCBM:P3HT absorber is p-doped by impurities of P3HT, so that a Schottky-like contact with aluminium is formed. It is known from literature, that annealing of PCBM:P3HT solar cells leads to drastic improvement of the photovoltaic performance. We compared the current-voltage characteristics and impedance spectra before and after consecutive annealing steps. After the annealing an expansion of the depletion region was observed, indicating that volatile dopants were evaporated out of the absorber. This contributes to an improved photovolta ic performance as the separation of the generated charges in the depletion region is more efficient than in the non-depleted region. Also an improved rectification behaviour might be caused by a lower doping level.