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Proceedings Paper

Novel hole transporting poly(triphenyldiamine)s for application in hybrid solar cells
Author(s): Claus Jaeger; Roland Bilke; Michael Heim; Dietrich Haarer; Harridas Karickal; Mukundan Thelakkat
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Paper Abstract

Dye-sensitized hybrid solar cells with a nanoporous TiO2 layer and different organic hole conducting polymers have been investigated. These hole transport materials (HTM) with low glass temperature (Tg) are based on triphenyldiamines (TPD). To enhance the power conversion efficiency, the HTMs were doped. New low Tg TPD-based polymers were designed and synthesized with long alkoxyl groups as sidechains or in the backbone, respectively, to investigate the influence of the soft alkoxyl chains on the penetration behavior into the nanoporous layer which has been studied by SEM. The effect of the penetration depth and wetting of the dye sensitized TiO2 layer by HTM on the solar cell efficiencies have been investigated by I-V- characteristics and steady-state measurements. To improve the penetration, the polymers were heated above Tg. The performance of the cell is decreasing probably due to degradation of the dye during thermal treatment. To enhance the conductivity of the hole transport materials, a Li salt has been used and this doped system was compared to a doped standard Gratzel cell with OMeTAD as HTM. Crystallization on the surface could be seen after storing the standard cell for some weeks.

Paper Details

Date Published: 5 February 2001
PDF: 8 pages
Proc. SPIE 4108, Organic Photovoltaics, (5 February 2001); doi: 10.1117/12.416938
Show Author Affiliations
Claus Jaeger, Univ. of Bayreuth (Germany)
Roland Bilke, Univ. of Bayreuth (Germany)
Michael Heim, Univ. of Bayreuth (Germany)
Dietrich Haarer, Univ. of Bayreuth (Germany)
Harridas Karickal, Univ. of Bayreuth (Germany)
Mukundan Thelakkat, Univ. of Bayreuth (Germany)

Published in SPIE Proceedings Vol. 4108:
Organic Photovoltaics
Zakya H. Kafafi, Editor(s)

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