High quality transparent conductive electrodes in organic photovoltaic devices |
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Authors: | M. Chakaroun B. Ratier J.P. Piel |
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Affiliation: | a XLIM Institute, UMR 6172, Université de Limoges/CNRS, 123 Avenue Albert Thomas, 87060 Limoges, France b SOPRA-SA, 26 rue Pierre Joigneaux, 92270 Bois-Colombes, France |
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Abstract: | The use of indium tin oxide (ITO) in conjunction with polymeric substrates requires deposition at low temperatures or room temperature, and with a limited or no thermal treatment. This process results in high resistivity materials. To achieve practical resistivity levels, we replaced ITO, the workhorse in organic optoelectronic devices, with an ITO/Ag/ITO tri-layer anode. This material yielded the desired electrical properties without a significant effect on its optical properties. For example, a sheet resistance of 15 Ω/□ and an optical transmission of 90% at 550 nm were obtained for a tri-layer film in which thickness of each ITO layer is 50 nm and the Ag layer thickness is 8 nm. The use of these tri-layer anodes in CuPc-C60-based organic solar cells led to an increase in the fill factor under illumination, and thus an improvement of the external power conversion efficiency. |
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Keywords: | Tri-layer transparent electrodes Ion beam sputtering Solar cells |
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