In English

NbN ultra-thin films for HEB-based THz systems

Sascha Krause
Göteborg : Chalmers tekniska högskola, 2013.
[Examensarbete på avancerad nivå]

The key technology for low-noise THz receivers operating above 1 THz, lies inevitably in the employment niobium nitride superconductors with critical bulk temperature of 16-17K. The enhancement of HEB’s limited IF bandwidth has been a relevant topic for two decades and is associated with the quality, hence critical temperature, Tc, of the 3.5-6nm thin NbN films. This thesis revisits the concept of employing buffer-layers which have not been utilized yet to deposit NbN onto. As a result, state-of-the-art 5.5nm thin NbN films have been successfully deposited exhibiting Tc as high as 13.2K and RRR-figure-of-merit close to unity. These films show considerable potential for highly-integrated THz electronics.



Publikationen registrerades 2013-12-10. Den ändrades senast 2017-02-22

CPL ID: 188818

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