Enhanced performance of flexible dye-sensitized solar cells: Electrodeposition of Mg(OH) 2 on a nanocrystalline TiO 2 electrode

T. A. Nirmal Peiris, S. Senthilarasu, K. G. Upul Wijayantha

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Abstract

Nanocrystalline TiO 2 photoanodes were prepared on a conductive indium-tin oxide coated polyethylene naphthalate (ITO-PEN) plastic substrate by the doctor-blade method to fabricate flexible dye-sensitized solar cells (DSCs). The surface of the photoanode was coated with Mg(OH) 2 by electrodeposition and the deposition time was systematically varied (2, 4, 6, 8, and 10 min). Electrodeposited Mg(OH) 2 was confirmed by IR and energy dispersive X-ray (EDX) analysis. The surface morphology was studied by scanning electron microscopy. The internal surface area of TiO 2 was studied against the deposition time by taking into account the projected surface area of the photoelectrode and it shows that the internal surface area of the photoelectrode was reduced as the Mg(OH) 2 deposition time increased. The performance of flexible DSCs on various deposition times of Mg(OH) 2 was evaluated on the basis of their photocurrent density-voltage characteristics. Among the deposition times, 2 min showed the best performance in V oc on a treated flexible DSC, with resulting 847 mV and a photocurrent density of 7.13 mA/cm 2, providing an overall light-to-electricity conversion efficiency of 4.01%. This photovoltage is among the highest attained for a flexible DSC to date. This notable increment in V oc at a thin layer of Mg(OH) 2 was attributed to the suppression of recombination of photogenerated electrons via the exposed surface of ITO as well as TiO 2 without influencing the internal surface area of the photoanode significantly.

Original languageEnglish
Pages (from-to)1211-1218
Number of pages8
JournalJournal of Physical Chemistry C
Volume116
Issue number1
DOIs
Publication statusPublished - 12 Jan 2012
Externally publishedYes

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