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

被引：1

作者：

Barkhouse, D. Aaron R. ^{[1
]}

Carey, Michelle J. ^{[1
]}

Xie, Zhibin ^{[1
]}

Kirov, Kiril R. ^{[1
]}

Henry, Bernard M. ^{[1
]}

Assender, Hazel E. ^{[1
]}

Webster, Graham R. ^{[2
]}

Burn, Paul L. ^{[2
]}

机构：

[1] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

[2] Univ Oxford, Dept Chem, Chem Res Lab, Oxford OX1 3TA, England

来源：

ORGANIC PHOTOVOLTAICS VII | 2006年 / 6334卷

关键词：

TiO2; polymer; MEH-PPV; nanocomposite; lithium; interface; solar cell; photovoltaic;

D O I：

10.1117/12.679424

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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](2)N, 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](2)N 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.

引用

页数：10

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