Biaxially Textured Substrate Tapes

Biaxially textured substrate tapes are the basis for the cost-effective manufacturing of coated conductors - the 2nd generation of High-temperature superconductor (HTS) tapes.

The almost single-cristalline structure of the superconducting YBa2Cu3O7-X-layer (YBCO), which is necessary for high ciritical currents, is provided by the substrate tape and transfered by epitaxial film growth through the buffer layers to the superconducting layer. The expensive texturing of a buffer layer by physical methods can be avoided.

Hence, the quality of texture and surface of the substrate tape is determining the electrical properties of the whole superconducting tape.

The YBCO-superconductor features higher critical currents and higher critical magnetic fields in comparison to the 1st generation of high-temperature superconductors, the Bi2Sr2Ca2Cu3O10-material.

Our patented substrate tape on Ni-basis shows a cubic texture of about 99 % cube-fraction and an intragrain surface-roughnes of 5 nm. It is suitable for epitaxial film-growth of thin-film photovoltaic elements and for a number of scientific studies.

Currently tapes of 10 mm width in pieces of up to 200 m are available. The installation of the equipment for the production of 100 mm wide tape is just in progress.