6 February 2004 Nanocomposite titanium dioxide/polymer photovoltaic cells: effects of TiO2 microstructure, time, and illumination power
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Proceedings Volume 5215, Organic Photovoltaics IV; (2004); doi: 10.1117/12.508477
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States
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.
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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, "Nanocomposite titanium dioxide/polymer photovoltaic cells: effects of TiO2 microstructure, time, and illumination power", Proc. SPIE 5215, Organic Photovoltaics IV, (6 February 2004); doi: 10.1117/12.508477; https://doi.org/10.1117/12.508477
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KEYWORDS
Solar cells

Sol-gels

Titanium dioxide

Circuit switching

Polymers

Crystals

Photovoltaics

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