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2013 | 1 | 1-10
Article title

Efficiency enhancement of P3HT:PCBM solar cells
containing scattering Zn-Al hydrotalcite nanoparticles
in the PEDOT:PSS layer

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In this article we report on a new hybrid (organic-inorganic)
composite material based on hydrophilic, electrically inert and
semi-transparent hydrotalcite (HT) nanoparticles and a pHneutral
formulation of PEDOT:PSS. The application of this
composite material as electrically and optically active buffer
layer in P3HT:PC61BM bulk heterojunction (BHJ) solar cells
is reported. Two different synthetic routes are explored to obtain
HTs having discoid shape, with a diameter of around 150-
200 nm and a thickness of ~20 nm, to be easily embedded in
~50 nm thick PEDOT:PSS films. The good affinity between
HTs and the sulfonate groups of the PEDOT:PSS allows to
obtain homogeneous HTs/PEDOT:PSS films, for HT concentrations
of 0.25% and 0.50% by weight (vs. PEDOT:PSS). At
these particle loads the electrical and morphological features
of doped and undoped PEDOT:PSS films are nearly identical,
while providing a significant effect on the visible light scattering
properties of the composite films. We demonstrate
~12% improvement in power conversion efficiency (PCE)
for P3HT:PC61BM solar cells incorporating HTs in the PEDOT:
PSS layer, which mainly originates from increased shortcircuit
current densities (JSC).
  • Laboratory MIST E-R, Via P. Gobetti, 101 - Bologna I-40129, Italy
  • Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei
    Materiali Nanostrutturati (CNR-ISMN),Via P. Gobetti,
    101 - Bologna I-40129, Italy
  • Dipartimento di Chimica and Centro di Eccellenza Materiali
    Innovativi Nanostrutturati (CEMIN), Università di Perugia,
    Via Elce di Sotto 10, 06123 Perugia, Italy
  • Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica
    e la Fotoreattività (CNR-ISOF) Via P. Gobetti,
    101 - Bologna I-40129, Italy
  • Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica
    e la Fotoreattività (CNR-ISOF) Via P. Gobetti,
    101 - Bologna I-40129, Italy,
  • Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei
    Materiali Nanostrutturati (CNR-ISMN),Via P. Gobetti,
    101 - Bologna I-40129, Italy,
  • Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei
    Materiali Nanostrutturati (CNR-ISMN),Via P. Gobetti,
    101 - Bologna I-40129, Italy
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