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arXiv · 1407.8467

Compact chromium oxide thin film resistors for use in nanoscale quantum circuits

C. R. Nash·J. C. Fenton·N. G. N. Constantino·P. A. Warburton
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Abstract

We report on the electrical characterisation of a series of thin chromium oxide films, grown by dc sputtering, to evaluate their suitability for use as on-chip resistors in nanoelectronics. By increasing the level of oxygen doping, the room-temperature sheet resistance of the chromium oxide films was varied from 28$Ω/ \square$ to 32.6k$Ω/ \square$. The variation in resistance with cooling to 4.2K in liquid helium was investigated; the sheet resistance at 4.2K varied with composition from 65$Ω/ \square$ to above 20G$Ω/ \square$. All of the films measured displayed ohmic behaviour at all measured temperatures. For on-chip devices for quantum phase-slip measurements using niobium-silicon nanowires, interfaces between niobium-silicon and chromium oxide are required. By characterising the interface contact resistance, we found that a gold intermediate layer is favourable: the specfic contact resistivity of chromium-oxide-to-gold interfaces was 0.15 m$Ω$cm$^2$, much lower than the value for direct chromium-oxide to niobium-silicon interfaces, 65m$Ω$cm$^2$. We conclude that these chromium oxide films are suitable for use in nanoscale circuits as high-value resistors, with resistivity tunable by oxygen content.

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C. R. Nash, J. C. Fenton, N. G. N. Constantino, P. A. Warburton. 2014-07-31. Compact chromium oxide thin film resistors for use in nanoscale quantum circuits. https://doi.org/10.1063/1.4901933

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