Nb/Al-AlN/Nb superconducting tunnel junctions: fabrication process and characterization results
Paper in proceedings, 2018

Modern radio astronomy demands for broadband receiver systems. For SIS mixers, this translates into objective to employsuperconducting tunnel junctions with very low RnA and low specific capacitance. The traditionally used Nb/AlOx/Nb junctions have largely approached their physical limit of minimizing those parameters. It is commonly recognized that it is AlN-barrier junctions, which are needed for further progressing of the broadband instrumentation for radio astronomy. In manuscript we present results of developing a fabrication process for high quality Nb/Al-AlN/Nb junctions and characterization the junctions' DC electric properties and their aging and annealing stability, as well as the junctions' specific capacitance.

Author

Alexey Pavolotskiy

Chalmers, Space, Earth and Environment, Onsala Space Observatory, GARD Technology

Vincent Desmaris

Chalmers, Space, Earth and Environment, Onsala Space Observatory, GARD Technology

Victor Belitsky

Chalmers, Space, Earth and Environment, Onsala Space Observatory, GARD Technology

The 2018 29th IEEE International Symposium on Space Terahertz Technology

Vol. 2018 107-111

29th IEEE International Symposium on Space THz Technology (ISSTT2018)
Pasadena, USA,

Subject Categories

Other Engineering and Technologies not elsewhere specified

Nano Technology

Infrastructure

Onsala Space Observatory

Nanofabrication Laboratory

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