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Article Dans Une Revue Superconductor Science and Technology Année : 2021

Improvement of critical temperature of niobium nitride deposited on 8-inch silicon wafers thanks to an AlN buffer layer

Catherine Bougerol
Eric Robin
Yohan Désières
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Eva Monroy
Jean-Michel Gérard

Résumé

In this paper, we study the crystalline properties and semiconducting critical temperature of ultra-thin (5-9 nm) NbN films deposited on 8-inch silicon wafers by reactive sputtering. We show that the deposition of NbN on a thin (10-20 nm) AlN buffer layer, also synthesized by reactive sputtering, improves the critical temperature by several Kelvin, up to 10 K for 9 nm NbN on 20 nm AlN. We correlate this improvement to the higher-crystalline quality of NbN on AlN. While NbN deposited directly on silicon is polycrystalline with randomly oriented grains, NbN on AlN(0001) is textured along (111), due to the close lattice match. The superconducting properties of the NbN/AlN stack are validated by the demonstration of fiber-coupled normal-incidence superconducting nanowire single photon detectors. The whole fabrication process is CMOS compatible, with a thermal budget compatible with the integration of other passive and active components on silicon. These results pave the way for the integration of a large number of surface or waveguide-integrated detectors on large-scale silicon wafers. Furthermore, as AlN is transparent over a broad wavelength range from the visible to the near-infrared, the optimized superconducting NbN/AlN stack can be used for a wide variety of applications, from imaging to quantum communications and quantum computing.
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Dates et versions

hal-03133791 , version 1 (07-02-2021)

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Raouia Rhazi, Houssaine Machhadani, Catherine Bougerol, Stéphane Lequien, Eric Robin, et al.. Improvement of critical temperature of niobium nitride deposited on 8-inch silicon wafers thanks to an AlN buffer layer. Superconductor Science and Technology, 2021, 34 (4), pp.045002. ⟨10.1088/1361-6668/abe35e⟩. ⟨hal-03133791⟩
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