Electrochemical Impedance Spectroscopy Characterization of Electron Transport and Recombination in ZnO Nanorod Dye-Sensitized Solar Cells

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Surface Physics Laboratory, Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People’s Republic of China, and Research and Technology Laboratory, Honeywell Integrated Technology (China) Co., 430 Libing Rd, Shanghai 201203, People’s Republic of China
* To whom correspondence should be addressed. E-mail: [email protected]; [email protected]
†Fudan University.
‡Honeywell Integrated Technology (China) Co.
Cite this: J. Phys. Chem. C 2009, 113, 24, 10322–10325
Publication Date (Web):May 26, 2009
Copyright © 2009 American Chemical Society
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In this work we carried out electrochemical impedance spectroscopic (EIS) characterizations on a ZnO nanorod dye-sensitized solar cell to investigate its electron transport and recombination properties and how these properties influence the cell performance. It is shown that the recombination process in the cell is mediated by an exponential distribution of surface trap states on the nanorods, which also governs the capacitance of the nanorods at low potentials. A strong dependence of recombination on the existence of a constant illumination has been observed, and this is shown to be a major efficiency-limiting factor for this type of devices. The Warburg feature has been observed from the high frequency region of the impedance, and transport resistances of ∼100 to 67 Ω have been determined. The transport resistance shows no dependence on illumination.

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Supplemental figures for impedance spectra under illumination, the transmission line model, comparison of the measured capacitance to the depletion model, charge transfer resistance at open-circuit conditions, and total resistances of the cell. This material is available free of charge via the Internet at http://pubs.acs.org.

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