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Title: An organic redox mediator for dye-sensitized solar cells with near unity quantum efficiency
Authors: Liu, Y.
Jennings, J.R. 
Parameswaran, M. 
Wang, Q. 
Issue Date: Feb-2011
Citation: Liu, Y., Jennings, J.R., Parameswaran, M., Wang, Q. (2011-02). An organic redox mediator for dye-sensitized solar cells with near unity quantum efficiency. Energy and Environmental Science 4 (2) : 564-571. ScholarBank@NUS Repository.
Abstract: The organic redox mediator tetramethylformaminium disulfide/ tetramethylthiourea was evaluated in dye-sensitized nanocrystalline TiO 2 solar cells, as an alternative to the conventional I 3 -/I- redox couple. Devices were optimized by judicious variation of electrolyte composition and selection of sensitizing dye. The best performance of the dye-sensitized solar cells incorporating this redox mediator was achieved by using a metal-free indoline-based sensitizer (D131). It was found that conventional ruthenium based sensitizers (e.g. Z907) exhibited inferior performance, possibly as a result of an insufficient driving force for sensitizer regeneration. A near unity incident photon-to-collected-electron conversion efficiency was achieved at low light intensity for optimized devices. The overall light-to-electric power conversion efficiency under AM 1.5 1 Sun illumination reached 3.88%. This represents an increase of ca. 25% compared with previously reported DSCs using this redox mediator. Factors limiting cell performance were further investigated using transient absorption spectroscopy and electrochemical impedance spectroscopy. © 2011 The Royal Society of Chemistry.
Source Title: Energy and Environmental Science
ISSN: 17545692
DOI: 10.1039/c0ee00519c
Appears in Collections:Staff Publications

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