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Proceedings Paper

Nanocomposite titanium dioxide/polymer photovoltaic cells: effects of TiO2 microstructure, time, and illumination power
Author(s): Michelle J. Carey; Victor M. Burlakov; Bernard M. Henry; Kiril R. Kirov; Graham R. Webster; Hazel E. Assender; G. Andrew D. Briggs; Paul L. Burn; Chris R.M. Grovenor
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Paper Abstract

Nanocomposite titanium dioxide/polymer photovoltaic cells have been fabricated using poly[2-(2-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEHPPV). Two different types of titanium dioxide were used, one synthesized using a sol-gel method, the other was a commercial paste. The crystal structure, porosity and absorption spectra of the titanium dioxide layers were measured, and the titanium dioxide synthesized using the sol-gel method had a much lower level of anatase. The photovoltaic properties of the ITO/TiO2/MEHPPV/Au cells, which were similar for both types of TiO2, were measured as a function of illumination power and compared with equivalent circuit models. A simple equivalent circuit model incorporating a diode, two resistances and a light induced current was inconsistent with the illumination -- dependent data and was improved by adding an illumination dependent shunt resistance. A very long lived, photo-induced increase in dark current was observed, which could not be explained by a polymer degradation mechanism or an increase in temperature under illumination, but was more likely to be due to trapped charge.

Paper Details

Date Published: 6 February 2004
PDF: 9 pages
Proc. SPIE 5215, Organic Photovoltaics IV, (6 February 2004); doi: 10.1117/12.508477
Show Author Affiliations
Michelle J. Carey, Univ. of Oxford (United Kingdom)
Victor M. Burlakov, Univ. of Oxford (United Kingdom)
Bernard M. Henry, Univ. of Oxford (United Kingdom)
Kiril R. Kirov, Univ. of Oxford (United Kingdom)
Graham R. Webster, Univ. of Oxford (United Kingdom)
Hazel E. Assender, Univ. of Oxford (United Kingdom)
G. Andrew D. Briggs, Univ. of Oxford (United Kingdom)
Paul L. Burn, Univ. of Oxford (United Kingdom)
Chris R.M. Grovenor, Univ. of Oxford (United Kingdom)

Published in SPIE Proceedings Vol. 5215:
Organic Photovoltaics IV
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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