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Proceedings Paper

Non-steady-state operation of polymer/TiO2 photovoltaic devices
Author(s): 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
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Paper 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 (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.

Paper Details

Date Published: 3 November 2004
PDF: 8 pages
Proc. SPIE 5520, Organic Photovoltaics V, (3 November 2004); doi: 10.1117/12.557158
Show Author Affiliations
Kiril R. Kirov, Univ. of Oxford (United Kingdom)
Victor M. Burlakov, Univ. of Oxford (United Kingdom)
Zhibin Xie, Univ. of Oxford (United Kingdom)
Bernard M. Henry, Univ. of Oxford (United Kingdom)
Michelle J. Carey, Univ. of Oxford (United Kingdom)
Christopher R. M. Grovenor, Univ. of Oxford (United Kingdom)
Paul L. Burn, Univ. of Oxford (United Kingdom)
Hazel E. Assender, Univ. of Oxford (United Kingdom)
G. Andrew D. Briggs, Univ. of Oxford (United Kingdom)


Published in SPIE Proceedings Vol. 5520:
Organic Photovoltaics V
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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