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O: Fachverband Oberflächenphysik
O 20: Solid / liquid interfaces II
O 20.4: Vortrag
Montag, 14. März 2011, 18:00–18:15, WIL B321
Light-induced electron transfer and charge transport in mesoporous ZnO/D149 hybrid films — •Melanie Rudolph1, Hidetoshi Miura2, and Derck Schlettwein1 — 1Institute of Applied Physics, Justus-Liebig-University Giessen, Germany. email:schlettwein@uni-giessen.de — 2Chemicrea Co., Ltd., 2-1-6 Sengen, Tsukuba, Ibaraki 305-0047, Japan
Dye-sensitized solar cells (DSC) consist of a nanostructured semiconductor/dye hybrid layer as light absorbing and electron conducting phase, permeated by a liquid phase ensuring transfer of positive charges to a counter electrode. In this study, nanostructured ZnO was electrodeposited on fluorine-doped tin oxide (FTO) and loaded with the fully organic dye D149. The ZnO/D149 electrodes were analyzed in contact with a liquid iodide/triiodide electrolyte. Steady-state photocurrent and photovoltage measurements were performed to derive basic photovoltaic parameters like short-circuit photocurrent, open-circuit photovoltage and external quantum efficiency (IPCE). Open-circuit photovoltage decay measurements (OCVD) as well as intensity-modulated photovoltage spectroscopy (IMVS) were utilized to obtain information about the extent and mechanisms of recombination, i.e. unwanted back transfer of electrons from ZnO to D149 or to the liquid contact phase. Intensity-modulated photocurrent spectroscopy (IMPS) served to gain an insight into electron transport within the porous zinc oxide films. The interplay between light-induced charge transfer from D149 to ZnO, electron transport within the porous ZnO matrix and recombination of photoinjected electrons is discussed.