Highly Conformal Diffusion Barriers of Amorphous Niobium Nitride
Keyword(s):
X Rays
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AbstractElectrically conductive films of niobium nitride were formed by chemical vapor deposition from tetrakis(diethylamido)niobium and ammonia. The films were found to be highly conformal, with step coverage nearly 100% for substrate temperatures near 350°C. The structure of the films was amorphous by diffraction of X-rays and electrons. The reliability of the films as barriers to diffusion of copper was also tested.