Process of self aligned nitridation of TiSi.sub.2 to form TiN/Ti

Fishing – trapping – and vermin destroying

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437246, 437192, 437247, 437174, 148DIG19, 357 71, H01L 21283

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047725710

ABSTRACT:
In order to prevent diffusion of silicon from under a titanium disilicide interconnect (1) and into an overlying aluminium layer (6), the disilicide is selectively nitrided by annealing in nitrogen at the points where interconnection between the disilicide and aluminium is required via holes (4) in a silicon dioxide layer (3). The titanium nitrode contacts (5) thus formed in a truly self-aligned manner provide a good barrier to silicon diffusion while having an acceptable low resistivity.

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P. J. Rossez, G. J. Tomkins, "Self Aligned Nitridation of TiSi.sub.2 : a TiN/TiSi.sub.2 Contact Structure", Materials Res. Soc. Symp. Proc., vol. 37 (Gibson et al. ed.), pp. 607-612, 1985, Mat. Res. Soc.

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