Semiconductor integrated circuit device and method of producing the same
First Claim
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1. A method of producing a semiconductor integrated circuit device comprising the steps of:
- exposing a part of a surface of silicon on a semiconductor substrate in such a manner that the surface shape of the exposed silicon region is defined by an insulating film;
depositing a refractory metal at least on said exposed silicon region;
forming a silicide layer of said refractory metal on said exposed silicon region, said silicide layer being formed by first annealing below 600°
C. which lets said silicon react with said refractory metal, and having a relatively high resistance;
removing said refractory metal other than the one that has contributed to said silicide layer, whereby said silicide layer remains unremoved; and
effecting a second annealing, in order to change said silicide layer having a relatively high resistance to a silicide layer having a low resistance, said second annealing including an annealing above 900°
C. in a nitrogen atmosphere.
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Abstract
A silicide layer of a refractory metal for reducing resistance and a nitride layer for preventing diffusion of aluminum are formed on the source and drain regions of an MISFET. The silicide layer is formed in self-alignment with the source and drain regions by two annealings effected at a low temperature and at a high temperature, respectively, and has a low resistance. The nitride layer is formed by directly nitriding the silicide layer.
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15 Claims
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1. A method of producing a semiconductor integrated circuit device comprising the steps of:
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exposing a part of a surface of silicon on a semiconductor substrate in such a manner that the surface shape of the exposed silicon region is defined by an insulating film; depositing a refractory metal at least on said exposed silicon region; forming a silicide layer of said refractory metal on said exposed silicon region, said silicide layer being formed by first annealing below 600°
C. which lets said silicon react with said refractory metal, and having a relatively high resistance;removing said refractory metal other than the one that has contributed to said silicide layer, whereby said silicide layer remains unremoved; and effecting a second annealing, in order to change said silicide layer having a relatively high resistance to a silicide layer having a low resistance, said second annealing including an annealing above 900°
C. in a nitrogen atmosphere. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification