Non-steady-state operation of polymer/TiO2 photovoltaic devices

Kiril R. Kirov; Victor M. Burlakov; Zhibin Xie; Bernard M. Henry; Michelle J. Carey; Christopher R. M. Grovenor; Paul L. Burn; Hazel E. Assender; G. Andrew D. Briggs

doi:10.1117/12.557158

3 November 2004 Non-steady-state operation of polymer/TiO₂ photovoltaic devices

Kiril R. Kirov, Victor M. Burlakov, Zhibin Xie, Bernard M. Henry, Michelle J. Carey, Christopher R. M. Grovenor, Paul L. Burn, Hazel E. Assender, G. Andrew D. Briggs

Author Affiliations +

Proceedings Volume 5520, Organic Photovoltaics V; (2004) https://doi.org/10.1117/12.557158
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

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 (V_oc) and of the short-circuit current density (J_sc) 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); https://doi.org/10.1117/12.557158

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