Author/Authors :
Gutsche، نويسنده , , M and Hettl، نويسنده , , P and Jochum، نويسنده , , J and Kemmather، نويسنده , , B and Kraus، نويسنده , , H، نويسنده ,
Abstract :
We fabricate X-ray detectors based upon superconducting Ta/Al/AlxOy/Al hetero tunnel junctions. Device characteristics are significantly influenced by the fact that the gap energies on the two sides of the tunnel barrier are not equal. We present experimental data showing the dependence of signal height and polarity on bias voltage in heterojunctions. The best energy resolution obtained in a single Ta/Al/AlxOy/Al heterojunction is 60 eV at 1.487 keV. We also report the observation of correlated signals from two separate tunnel junctions attached to one common Ta absorber strip.
