Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 57: Solid / liquid interfaces II
O 57.2: Talk
Wednesday, March 28, 2012, 17:00–17:15, A 060
Photoelectrochemical Characterization of Bimodal ZnO Nanostructures as Photoanodes in Dye-sensitized Solar Cells — •Christoph Richter1, Michael Schröder2, Melanie Rudolph1, Max Beu1, Bernd Smarsly2, and Derck Schlettwein1 — 1Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, D-35392 Gießen — 2Justus-Liebig-Universität Gießen, Physiklaisch-Chemisches Institut, Heinrich-Buff-Ring 58, D-35392 Gießen
Bimodal ZnO nanostructures were fabricated by electrochemical deposition from aqueous solution. A layer of monodisperse polystyrene spheres obtained by mini-emulsion polymerization acts as a template for the electrodeposition. EosinY serves as a structure-directing agent towards formation of a mesoporous ZnO/EosinY hybrid material. EosinY can easily be removed by soaking in an aqueous solution of sodium hydroxide. The polystyrene spheres are chemically decomposed and a meso-macroporous network of ZnO is obtained. Following sensitization by a dye monolayer, these films were characterized by intensity modulated photocurrent spectroscopy (IMPS), intensity modulated photo voltage spectroscopy (IMVS), open circuit voltage decay (OCVD) and electrochemical impedance spectroscopy (EIS). Charge transport, recombination and photovoltaic properties are discussed.