Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 46: [DS] Organic electronics and photovoltaics: electronic properties II (jointly with CPP, HL, O)
O 46.2: Talk
Wednesday, March 28, 2012, 11:45–12:00, H 2032
Dye Sensitised Solar Cells with Carotenoid Molecules — •Gino Günzburger1, Res Jöhr1, Biljana Bozic Weber2, Catherine Housecroft2, Edwin Constable2, Hubert Hug3, Petra Buchwald Hunziker3, Ernst Meyer1, and Thilo Glatzel1 — 1University of Basel, Department of Physics, Switzerland — 2University of Basel, Department of Chemistry, Switzerland — 3DSM Nutritional Products Ltd., NRD CH, Kaiseraugst, Switzerland
We report the analysis of long time stable dye sensitized solar cells using organic carotenoid-based dyes (crocetin, torularhodin and bixin). The particular properties of natural dyes require sensitisation in anhydrous solvents as well as cell assembly under inert gas atmosphere. Furthermore, the exposure to UV light, and the heat-transfer to the sensitised layers was minimized. However, a standard KI based electrolyte was still employed.
The cells were prepared and characterised by IV- and QE-measurements without any anti-reflective or light incoupling foils, or additional light-scattering titania layers. In contrast to the expectations the present cells yield relatively high efficiencies and stability (colour and efficiency was unchanged over a period of days or even weeks). The measured efficiencies under 100 mW/cm2 AM1.5 simulated sun light at 25 ∘C were 1.23%, 0.40% and 0.75% for the crocetin, torularhodin and bixin cells, respectively. Comparable literature values for crocetin dyes are 0.56% and thus lower by a factor of more than 2. [1].
[1]Yamakazi et al. Solar Energy 81 (2007)