Enhanced Charge Transport Kinetics in Anisotropic, Stratified Photoanodes

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Nanoscience for Energy Technology and Sustainability, Department of Mechanical and Process Engineering, ETH Zürich, Sonneggstrasse 3, Zürich CH-8092, Switzerland
Laboratory for Nanoelectronics, Department of Information Technology and Electrical Engineering, ETH Zürich, Gloriastrasse 35, Zürich CH-8092, Switzerland
§ Laboratory for Mechanics of Materials and Nanostructures, EMPA, Feuerwerkstrasse 39, Thun CH-3602, Switzerland
Laboratory for Nanoscale Materials Science, EMPA, Überlandstrasse 129, Dübendorf CH-8600, Switzerland
Cite this: ACS Appl. Mater. Interfaces 2014, 6, 3, 1389–1393
Publication Date (Web):January 27, 2014
Copyright © 2014 American Chemical Society
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The kinetics of charge transport in mesoporous photoanodes strongly constrains the design and power conversion efficiencies of dye sensitized solar cells (DSSCs). Here, we report a stratified photoanode design with enhanced kinetics achieved through the incorporation of a fast charge transport intermediary between the titania and charge collector. Proof of concept photoanodes demonstrate that the inclusion of the intermediary not only enhances effective diffusion coefficients but also significantly suppresses charge recombination, leading to diffusion lengths two orders of magnitude greater than in standard mesoporous titania photoanodes. The intermediary concept holds promise for higher-efficiency DSSCs.

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Derivation of the small signal transient continuity equation as well as a detailed derivation of its solutions and how they can be related to measurements, description of the method to determine the volume fill fraction of the H photoanodes, a plot of the absorption coefficient for both types of photoanodes, plots of photocurrent and photovoltage transients for an MT photoanode, and a detailed account of the experimental methods as referred to in the text. This material is available free of charge via the Internet at http://pubs.acs.org.

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