A silanol-functionalized polyoxometalate with excellent electron transfer mediating behavior to ZnO and TiO2 cathode interlayers for highly efficient and extremely stable polymer solar cells

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2018
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Kaltzoglou, Andreas
Papadopoulos, Theodoros A.
Auras, Florian
Seintis, Kostas
Fakis, Mihalis
Palilis, Leonidas C.
Tsikritzis, Dimitris
Kennou, Stella
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urn:nbn:de:bsz:352-2-1fsoaowih3isi6
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10.1039/C7TC04960A
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Journal of Materials Chemistry C ; 6 (2018), 6. - pp. 1459-1469. - ISSN 2050-7526. - eISSN 2050-7534
Abstract
Combining high efficiency and long lifetime under ambient conditions still poses a major challenge towards commercialization of polymer solar cells. Here we report a facile strategy that can simultaneously enhance the efficiency and temporal stability of inverted photovoltaic architectures. Inclusion of a silanol-functionalized organic–inorganic hybrid polyoxometalate derived from a PW9O34 lacunary phosphotungstate anion, namely (nBu4N)3[PW9O34(tBuSiOH)3], significantly increases the effectiveness of the electron collecting interface, which consists of a metal oxide such as titanium dioxide or zinc oxide, and leads to a high efficiency of 6.51% for single-junction structures based on poly(3-hexylthiophene):indene-C60 bisadduct (P3HT:IC60BA) blends. The above favourable outcome stems from a large decrease in the work function, an effective surface passivation and a decrease in the surface energy of metal oxides which synergistically result in the outstanding electron transfer mediating capability of the functionalized polyoxometalate. In addition, the insertion of a silanol-functionalized polyoxometalate layer significantly enhances the ambient stability of unencapsulated devices which retain nearly 90% of their original efficiencies (T90) after 1000 hours.
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ISO 690KALTZOGLOU, Andreas, Theodoros A. PAPADOPOULOS, Florian AURAS, Kostas SEINTIS, Mihalis FAKIS, Leonidas C. PALILIS, Dimitris TSIKRITZIS, Stella KENNOU, Azhar FAKHARUDDIN, Lukas SCHMIDT-MENDE, 2018. A silanol-functionalized polyoxometalate with excellent electron transfer mediating behavior to ZnO and TiO2 cathode interlayers for highly efficient and extremely stable polymer solar cells. In: Journal of Materials Chemistry C. 6(6), pp. 1459-1469. ISSN 2050-7526. eISSN 2050-7534. Available under: doi: 10.1039/C7TC04960A
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@article{Kaltzoglou2018silan-41783,
  year={2018},
  doi={10.1039/C7TC04960A},
  title={A silanol-functionalized polyoxometalate with excellent electron transfer mediating behavior to ZnO and TiO<sub>2</sub> cathode interlayers for highly efficient and extremely stable polymer solar cells},
  number={6},
  volume={6},
  issn={2050-7526},
  journal={Journal of Materials Chemistry C},
  pages={1459--1469},
  author={Kaltzoglou, Andreas and Papadopoulos, Theodoros A. and Auras, Florian and Seintis, Kostas and Fakis, Mihalis and Palilis, Leonidas C. and Tsikritzis, Dimitris and Kennou, Stella and Fakharuddin, Azhar and Schmidt-Mende, Lukas}
}
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