Dresden 2009 – scientific programme

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.51: Poster

Thursday, March 26, 2009, 16:30–19:00, P1A

Novel Concepts in Solid-State Dye-Sensitized Solar Cells — •Katja Willinger¹, Johannes Brendel¹, Yan Lu², and Mukundan Thelakkat¹ — ¹Makromolekulare Chemie I, Angewandte Funktionspolymere, Universität Bayreuth, 95440 Bayreuth, Germany — ²Physikalische Chemie I, Universität Bayreuth, 95440 Bayreuth, Germany

We combine two major concepts to improve the performance of solid-state dye-sensitized solar cells (SDSC). In concept I, we synthesize novel heteroleptic Ru(II)bis(bipyridyl)(NCS)2 dyes carrying donor-antenna groups. These dyes typically comprise of an efficient anchoring group to guarantee a proper connection between the dye and the mesoporous TiO2 surface, two NCS-groups to cause a bathochromic shift of the absorption spectra and novel donor-antenna groups. These groups effect very high extinction coefficients and as a consequence of this a distinctive light harvesting behaviour. To prove the performance of this new dyes they were applied in SDSCs consisting of FTO coated glass, mesoporous TiO2 and for regeneration of the dyes Spiro-OMeTAD as hole transport layer. In concept II, we developed novel porous TiO2 network using polymer electrolyte brushes as templates to control the morphology of the network and thus to provide best conditions for a sufficient pore filling and an effective electron transport. The facile tuning of the brush length as well as core size of the template and defined amounts of TiO2 hydrolysed within the brushes finally provide exact control on the resulting morphology of the porous network.