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A Novel Efficient, Iodide-Free Redox Mediator for Dye-Sensitized Solar Cells

Published online by Cambridge University Press:  01 February 2011

Zhipan Zhang
Affiliation:
zhipan.zhang@epfl.ch, Ecole Polytechnique Federale de Lausanne, Institute of Chemical Sciences and Engineering, Station 6, LPI-ISIC-EPFL, Lausanne, CH-1015, Switzerland, 0041-21-6936169, 0041-21-6934111
Peter. Chaoyu Chen
Affiliation:
peter.chen@epfl.ch, Ecole Polytechnique Federale de Lausanne, Institute of Chemical Sciences and Engineering, Station 6, LPI-ISIC-EPFL, Lausanne, CH-1015, Switzerland
Shaik Mohammed Zakeeruddin
Affiliation:
shaik.zakeer@epfl.ch, Ecole Polytechnique Federale de Lausanne, Institute of Chemical Sciences and Engineering, Station 6, LPI-ISIC-EPFL, Lausanne, CH-1015, Switzerland
Jacques-Edouard Moser
Affiliation:
je.moser@epfl.ch, Ecole Polytechnique Federale de Lausanne, Institute of Chemical Sciences and Engineering, Station 6, LPI-ISIC-EPFL, Lausanne, CH-1015, Switzerland
Michael Grätzel
Affiliation:
michael.graetzel@epfl.ch, Ecole Polytechnique Federale de Lausanne, Institute of Chemical Sciences and Engineering, Station 6, LPI-ISIC-EPFL, Lausanne, CH-1015, Switzerland
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Abstract

A stable organic molecular radical, 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO), has been electrochemically studied and employed as a new redox mediator in nanocrystalline TiO2 dye-sensitized solar cells (DSCs) when it is doped with nitrosonium tetrafluoroborate (NOBF4). Reasonable photocurrents can be achieved despite of driving force of only 0.2 eV for the TEMPO/TEMPO+ system as compared to 0.6 eV for the iodide/triiodide redox system. Judicious selections of a 5 µm photoanode made from TiO2 mesoscopic particles (60 nm in diameter) and an organic sensitizer with high molar extinction coefficient yield an overall power conversion of 5.0 % under AM 1.5 illumination at 100 mW cm-2 and an incident photon-to-current conversion efficiencies (IPCE) in excess of 50 %.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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