Twofold efficiency increase in nanocrystalline-TiO2/polymer photovoltaic devices by interfacial modification with a lithium salt

Barkhouse, D. Aaron R., Carey, Michelle J., Xie, Zhibin, Kirov, Kiril R., Henry, Bernard M., Assender, Hazel E., Webster, Graham R. and Burn, Paul L. (2006). Twofold efficiency increase in nanocrystalline-TiO2/polymer photovoltaic devices by interfacial modification with a lithium salt. In: Zakya H. Kafafi and Paul A. Lane, Proceedings of SPIE: Organic Photovoltaics VII. Conference on Organic Photovoltaics VII, San Diego, CA, United States, (U90-U99). 15-17 August 2006. doi:10.1117/12.679424

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Author Barkhouse, D. Aaron R.
Carey, Michelle J.
Xie, Zhibin
Kirov, Kiril R.
Henry, Bernard M.
Assender, Hazel E.
Webster, Graham R.
Burn, Paul L.
Title of paper Twofold efficiency increase in nanocrystalline-TiO2/polymer photovoltaic devices by interfacial modification with a lithium salt
Formatted title
Twofold efficiency increase in nanocrystalline-TiO2/polymer photovoltaic devices by interfacial modification with a lithium salt
Conference name Conference on Organic Photovoltaics VII
Conference location San Diego, CA, United States
Conference dates 15-17 August 2006
Proceedings title Proceedings of SPIE: Organic Photovoltaics VII   Check publisher's open access policy
Journal name Organic Photovoltaics VII   Check publisher's open access policy
Place of Publication Bellingham, WA, United States
Publisher SPIE - International Society for Optical Engineering
Publication Year 2006
Sub-type Fully published paper
DOI 10.1117/12.679424
Open Access Status File (Publisher version)
ISSN 0277-786X
1996-756X
Editor Zakya H. Kafafi
Paul A. Lane
Volume 6334
Start page U90
End page U99
Total pages 10
Language eng
Formatted Abstract/Summary
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.
Keyword TiO2
Polymer
Meh-Ppv
Nanocomposite
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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