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Proceedings Paper

Two-fold efficiency increase in nanocrystalline-TiO2/polymer photovoltaic devices by interfacial modification with a lithium salt
Author(s): D. Aaron R. Barkhouse; Michelle J. Carey; Zhibin Xie; Kiril R. Kirov; Bernard M. Henry; Hazel E. Assender; Graham R. Webster; Paul L. Burn
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Paper Abstract

Modification of the interface of titanium dioxide/poly[2-(2-ethylhexyloxy)-5-methoxy-1,4,-phenylenevinylene] (TiO2/MEH-PPV) nanocomposite photovoltaic devices with a lithium salt, Li[CF3SO2]2N, is shown to result in a twofold increase in device efficiency. The devices are of the type ITO/TiO2/MEH-PPV/Au. The TiO2 layer is deposited by doctor blading a colloidal anatase paste, and the polymer is then spin-coated on top followed by thermal evaporation of gold contacts. Careful control of manufacturing conditions and use of a 35 nm polymer layer leads to a device efficiency of 0.48% for un-modified devices. The increased efficiency following Li treatment is the result of a 40% increase in both the short-circuit current and fill factor, while the open-circuit voltage remains unchanged. A maximum efficiency of 1.05% has been achieved under 80% sun illumination. This represents a record efficiency for this type of cell. Photoconductivity experiments show a substantial increase in conductivity of the TiO2 layer following Li modification. Interfacial modification is done via a simple soaking procedure, and the effect of varying the concentration of Li[CF3SO2]2N is discussed. We report investigations into optimization and the mechanism of such improvement, for example by varying processing parameters of the modification procedure or the ionic species themselves.

Paper Details

Date Published: 3 November 2006
PDF: 10 pages
Proc. SPIE 6334, Organic Photovoltaics VII, 63340N (3 November 2006); doi: 10.1117/12.679424
Show Author Affiliations
D. Aaron R. Barkhouse, Univ. of Oxford (United Kingdom)
Michelle J. Carey, Univ. of Oxford (United Kingdom)
Zhibin Xie, Univ. of Oxford (United Kingdom)
Kiril R. Kirov, Univ. of Oxford (United Kingdom)
Bernard M. Henry, Univ. of Oxford (United Kingdom)
Hazel E. Assender, Univ. of Oxford (United Kingdom)
Graham R. Webster, Univ. of Oxford (United Kingdom)
Paul L. Burn, Univ. of Oxford (United Kingdom)

Published in SPIE Proceedings Vol. 6334:
Organic Photovoltaics VII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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