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3 November 2004 Non-steady-state operation of polymer/TiO2 photovoltaic devices
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We present data on the initial period of operation of Gilch-route MEH-PPV/TiO2 composite solar cells (CSCs) which show that during this period the CSCs operate in a non-steady state regime. The behavior is complex and may include a gradual rise of the open circuit voltage (Voc) and of the short-circuit current density (Jsc) with time, a passage through a maximum of either or both parameters, and even a sign reversal. The mechanisms most probably contributing to the transient processes are: i) diffusion driven redistribution of charges resulting in the build up of a quasi steady state charge density profile across the device; ii) photo-doping resulting in a relatively slow increase of the average charge carrier concentration and consequently of the conductivity of the device. The latter is responsible for a strong decrease in Voc, and is evidenced by the significant increase in dark current after device illumination.
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Kiril R. Kirov, Victor M. Burlakov, Zhibin Xie, Bernard M. Henry, Michelle J. Carey, Christopher R. M. Grovenor, Paul L. Burn, Hazel E. Assender, and G. Andrew D. Briggs "Non-steady-state operation of polymer/TiO2 photovoltaic devices", Proc. SPIE 5520, Organic Photovoltaics V, (3 November 2004);

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