Kylberg, W; Wain, A J; Castro, F A (2012) Screening of Photoactive dyes on TiO2 surfaces using scanning electrochemical microscopy. J. Phys. Chem. C, 116 (33). pp. 17384-17392.

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Abstract

Screening dye performance on TiO2 surfaces is becoming increasingly relevant as industry tries to expand commercialisation of dye sensitised solar cells (DSSCs). Here we demonstrate how a simplified version of scanning electrochemical microscopy (SECM) together with photoexcitation of dispensed arrays of dye spots can be used as a powerful yet low-cost screening method.
A standard SECM configuration uses separate reference and auxiliary electrodes together with an ultra-microelectrode (UME) working electrode (WE) and the substrate as an optional second WE. In this work we evaluate different electrode configurations, measurement modes and measurement parametres to optimise photocurrent image quality. We propose an innovative 2-electrode configuration that is a close representation of a real DSSC in operation. This simplifies the required instrumentation (no bipotentiostat or reference or auxiliary electrodes) compared to the more conventional 4-electrode approach, reducing costs and allowing the screening method to be readily used by industry. Using this approach the simultaneous screening of different dyes is demonstrated and the relative photocurrent of different dye samples in the arrays is shown to be comparable to the relative performances of full devices.

Item Type:	Article
Keywords:	Dye sensitized solar cell, microelectrode, photocurrent mapping, dye array, jetting device
Subjects:	Advanced Materials Advanced Materials > Photovoltaics
Identification number/DOI:	10.1021/jp304599v
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/5682

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