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=Tungsten Nitride (WN<sub>x</sub>)=
=Tungsten Nitride (WN<sub>x</sub>)=


Scandium nitride (ScN) is a rocksalt‑structure semiconductor with an indirect bandgap near 0.9 eV and a direct transition around 2.1 eV, combining high electron mobility, excellent thermal stability, and notable hardness in a chemically inert matrix.
Tungsten nitride (WNₓ, commonly W₂N or δ‑WN) is a refractory ceramic that combines very high melting temperature, extreme hardness, chemical inertness, and good electrical conductivity in a composition‑tunable, CMOS‑compatible matrix.
It is deposited by reactive magnetron sputtering for dense, textured films and by atomic layer deposition (ALD) when ultra-conformal, thickness-precise coatings are required on high-aspect-ratio or temperature-sensitive structures.
Thin films are produced chiefly by reactive magnetron sputtering—where nitrogen flow and substrate temperature set stoichiometry and phase—and by e‑beam evaporation of tungsten in a reactive nitrogen ambient, yielding dense layers with controllable resistivity and stress.
In microelectronics, ScN functions as a diffusion barrier or seed layer, a lattice‑matched buffer for GaN/AlGaN power devices, and an emerging channel or contact material for high‑mobility transistors and thermoelectric modules.
In semiconductor process flows, WNₓ acts as a robust Cu diffusion barrier/liner, hard mask, gate or contact material, and precision thin‑film resistor; its high absorption coefficient also makes it the standard absorber layer in EUV lithography photomasks and a candidate for x‑ray mask blanks.
During reactive sputtering of AlN, elemental Sc is routinely co‑sputtered to form Al₁₋ₓScₓN, whose enhanced piezoelectric coefficients and ferroelectric phases enable next‑generation MEMS resonators, RF filters, and non‑volatile FeFET memories.
Optically, WN-based stacks offer durable, high-temperature plasmonic and thermally emissive coatings, mid-IR absorbers, and multilayer structures for soft-x-ray mirrors and synchrotron beamline optics, delivering stability far beyond noble metals under extreme photon flux.
Optically, ScN’s tunable plasma frequency supports near‑IR plasmonics, hot‑carrier photodetectors, and durable high‑temperature absorbers, while doped ScN shows adjustable n‑type conductivity and potential room‑temperature ferromagnetism for spintronic devices.
Beyond electronics and photonics, the material’s wear and oxidation resistance support MEMS springs, high‑temperature sensors, and corrosion‑resistant coatings, while select WN phases become superconducting below roughly 3–5 K, enabling niche low‑loss microwave resonators and detector elements that benefit from its mechanical robustness and diffusion‑barrier capability.
Its high hardness, oxidation resistance, and decent thermal conductivity further suit ScN for protective coatings, MEMS layers, and thermoelectric power generators in harsh environments, underscoring its versatility across semiconductor, photonic, and engineering applications.


== Deposition of Scandium Nitride ==
== Deposition of Scandium Nitride ==

Revision as of 18:44, 30 July 2025

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Tungsten Nitride (WNx)

Tungsten nitride (WNₓ, commonly W₂N or δ‑WN) is a refractory ceramic that combines very high melting temperature, extreme hardness, chemical inertness, and good electrical conductivity in a composition‑tunable, CMOS‑compatible matrix. Thin films are produced chiefly by reactive magnetron sputtering—where nitrogen flow and substrate temperature set stoichiometry and phase—and by e‑beam evaporation of tungsten in a reactive nitrogen ambient, yielding dense layers with controllable resistivity and stress. In semiconductor process flows, WNₓ acts as a robust Cu diffusion barrier/liner, hard mask, gate or contact material, and precision thin‑film resistor; its high absorption coefficient also makes it the standard absorber layer in EUV lithography photomasks and a candidate for x‑ray mask blanks. Optically, WN-based stacks offer durable, high-temperature plasmonic and thermally emissive coatings, mid-IR absorbers, and multilayer structures for soft-x-ray mirrors and synchrotron beamline optics, delivering stability far beyond noble metals under extreme photon flux. Beyond electronics and photonics, the material’s wear and oxidation resistance support MEMS springs, high‑temperature sensors, and corrosion‑resistant coatings, while select WN phases become superconducting below roughly 3–5 K, enabling niche low‑loss microwave resonators and detector elements that benefit from its mechanical robustness and diffusion‑barrier capability.

Deposition of Scandium Nitride

Deposition of ScN can only be done by reactive sputtering using Sc target.

The only tool for this application is the Cluster-based multi-chamber high vacuum sputtering deposition system, commonly referred to as the 'Cluster Lesker.' The operating process is thoroughly documented and described in detail.:

At the moment (October 2023) we have a 4-inch Sc target (0.250" thick, bonded to Cu) for PC3 Src1.

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