Abstract
Superconducting tunnel junctions (STJs) with the structure Ti/Nb/Al, AlOx/Al/Nb/NbN and corresponding layer thickness 30/100/8/13/150/30nm were investigated as X-ray detectors at T=1.35K. STJs with one active electrode in which the response of the other one is suppressed due to trapping layer on the surface opposite to the tunnel barrier have a number of potential advantages. The best line width (FWHM) is 78eV for 6400μm2 junction. Contribution of the electronic noise is about 50eV. The intrinsic detector line width is less than 60eV. The collected charge from inactive electrode is more than 8 times less than that from the active one. Titanium proved to be an appropriate material for a sublayer and a trap.
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