Wn. Maung et al., FABRICATION OF NBN THIN-FILMS BY REACTIVE SPUTTERING, Journal of vacuum science & technology. A. Vacuum, surfaces, and films, 11(3), 1993, pp. 615-620
We have fabricated NbN thin films by reactive rf magnetron sputtering.
Critical temperatures above 15 K have been achieved by carefully moni
toring the deposition parameters of total chamber pressure, rate of Ar
and N2 injection, partial pressures of Ar and N2 in the chamber and d
eposition rate. We found the deposition rate and partial pressure rati
os of Ar:N2 to be the key parameters in reliably obtaining high critic
al temperature thin films. The critical temperature dependence upon to
tal chamber pressure was found to be in general agreement with the sca
ling law. High quality NbN thin film microstructures were obtained by
plasma etching without the degradation of the superconducting properti
es of the film.