Dübendorf, St. Gallen, Thun, 24.03.2011 - The normal market technology-based solar cells strained silicon is not suitable for the production of malleable thin film solar cells, these collected in a transparent electrode, flexible and conductive, the light and go for power. A polymer electrode-tissue Empa achieved first promising results and is recommended instead of a layer of indium tin oxide.
The shortage of raw materials and increased consumption of rare metals and more expensive electronic components and devices. They are used as transparent electrodes for touch screen mobile phones, liquid crystal displays, organic light emitting diodes and thin-film solar cells. The material of choice for this is the indium-tin oxide (ITO, oxide, indium tin Eng), an oxide conductor, made substantially transparent. Since the OIC is relatively expensive, however, is not profitable for large scale applications such as solar cells.
The shortage of raw materials and increased consumption of rare metals and more expensive electronic components and devices. They are used as transparent electrodes for touch screen mobile phones, liquid crystal displays, organic light emitting diodes and thin-film solar cells. The material of choice for this is the indium-tin oxide (ITO, oxide, indium tin Eng), an oxide conductor, made substantially transparent. Since the OIC is relatively expensive, however, is not profitable for large scale applications such as solar cells.
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While it is not transparent, free of oxides of indium, but with increasing demand are distinguished here by the shortage of supply. In addition, there remain fundamental disadvantages as the fragility of the deformation. Therefore, the alternative transparent conductive layers have been extensively studied, such as conductive polymers, carbon nanotubes or graphene.
Carbon-based electrodes, however, resistance to the surface is usually too high and therefore fewer drivers. When a metal grille integrated into the organic layer, reduced resistance, but also the mechanical stability: If the tilt of the solar cell to break the layers and are no longer performed. The challenge, therefore, is flexible, but strong substrates, conductor of producing industry, ideally in a process of low-cost deployment.
Carbon-based electrodes, however, resistance to the surface is usually too high and therefore fewer drivers. When a metal grille integrated into the organic layer, reduced resistance, but also the mechanical stability: If the tilt of the solar cell to break the layers and are no longer performed. The challenge, therefore, is flexible, but strong substrates, conductor of producing industry, ideally in a process of low-cost deployment.
One solution: tissue electrodes
As a promising opportunity to turn a fabric transparent, flexible polymer that has developed in the EMPA Sefar the Commission on Technology and Innovation CTI project with the financial support of the AG. The Swiss company specializing in precision woven fabric can produce similar cheap and in large quantities on a roll as the deployment process for the printing of newspapers. The electrical conductivity is necessary to wire woven metal. In a second phase of the process, the tissue in a layer of inert plastic fit, without being completely covered electrically insulated metal filaments. The resulting electrode is transparent, stable and flexible. Then, the Empa researchers then applied organic solar cells in a shift system. Its effectiveness is comparable to conventional cell-based ITO, on the other hand, the electrode into the tissue deformation is much more stable than commercially available, flexible plastic substrates, the ITO layer is applied as a thin conductive .
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