Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 78: Hybrid and Perovskite Photovoltaics II
CPP 78.10: Vortrag
Freitag, 16. März 2018, 12:00–12:15, C 264
Increased Photovoltage by Use of Metal Complexes as Redox Couples in Dye-Sensitized Solar Cells based on Low-Temperature Electrodeposited ZnO — •Raffael Ruess, Thi Hai Quyen Nguyen, Sebastian Haas, Andreas Ringleb, and Derck Schlettwein — IAP, JLU Giessen, Germany
Dye-sensitized solar cells (DSSCs) have received continued interest because of new record efficiencies (up to 14.3 %) and low energy payback times. This work is focused on DSSCs based on electrodeposited, porous ZnO which allows low preparation temperatures to further reduce energy consumption of cell production and to use various kinds of substrates such as flexible foils, threads, wires or fibers. One of the most promising strategies to reduce voltage losses in the cells consists in replacement of the I−/I3− redox electrolyte by metal complex redox couples that show fast electron transfer kinetics at low driving force. Detailed photoelectrochemical studies are used to investigate charge transfer and transport in complete photovoltaic devices. Recombination at the ZnO/electrolyte interface as well as mass transport in the electrolyte have been identified as performance-limiting factors. Control of these factors was achieved by manipulating the electrolyte composition leading to promising power conversion efficiencies of 3.56 % or 3.85 % with cobalt-based or copper-based redox couples. This work shows that such metal complex redox couples can also be applied in cells based on ZnO and opens the door for further improvements in device efficiency of this type of DSSCs.