Dresden 2009 – wissenschaftliches Programm
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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 5: Organic Photovoltaics III
SYOP 5.4: Vortrag
Freitag, 27. März 2009, 11:15–11:30, ZEU 222
Textile electrodes as substrates in the electrochemical growth of porous ZnO for application in dye-sensitized solar cells — •Thomas Loewenstein1, Markus Mingebach1, Melanie Rudolph1, Kerstin Strauch1, Yvonne Zimmermann2, Andreas Neudeck2, and Derck Schlettwein1 — 1Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, D-35392, Gießen. — 2Textilforschungsinstitut Thüringen-Vogtland e.V., D-07973, Greiz.
The use of textile substrates for solar active electrodes is of interest in view of future applications of textile based electronics. Active structures prepared below 150 ∘C are needed. An approach using dye sensitized solar cells is useful for the achievable electrode distances in the micrometer range. Deposition of semiconductor films from solutions appears as an optimum technique. We will discuss the results of cathodic electrodeposition of porous ZnO films from aqueous zinc salt solutions with a structure directing agent (SDA) on metal- coated polyamide fibers leading to well- oriented single crystalline particles of ZnO with a high internal surface area. Individual fibers showed characteristics of microelectrodes and hence increased deposition rates were obtained relative to traditional planar electrodes. The modification of the diffusion layer by hydrodynamic flow or pulsed deposition had a strong effect on the morphology of the grown ZnO. Following the dissolution of the SDA in aqueous KOH, a porous ZnO structure was obtained. Sensitization studies will be presented to show the feasibility of the chosen approach. Lit.: T. Loewenstein et.al. Phys. Chem. Chem. Phys., 10, 1844 (2008)