Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 23: Organic Electronics and Photovoltaics III (DS jointly with CPP, HL, O)

O 23.5: Talk

Monday, March 31, 2014, 19:00–19:15, CHE 91

Effect of Counter-Anions During Electrodeposition on the Charge Transport Dynamics in Sensitized ZnO Solar Cells — •Christoph Richter, Max Beu, and Derck Schlettwein — Institute of Applied Physics, Justus-Liebig-University Giessen, Germany

Thin porous ZnO/EosinY films have been electrochemically deposited from oxygen-saturated aqueous solution. During the electrochemical deposition chloride or perchlorate as different counter-anions have been used. After the removal of EosinY with KOH the films have been sensitized with the indoline dye D149. These electrodes were used in dye-sensitized solar cells (DSCs) and the charge transport dynamics were studied with electrochemical impedance spectroscopy (EIS), intensity modulated current/voltage spectroscopy (IMPS/IMVS) and IV-curves. Doping of the ZnO films by Cl alters the charge transfer dynamics by filling of otherwise unoccupied states in ZnO and changing the concentration of available trap states. By changing the counter-anion to perchlorate well-reproducible results could be obtained which open the way to further improvements in DSCs.