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Abstract
Low resistivity C54-TiSi2 is currently the most commonly used silicide for metal contacts in ultralarge scale integrated circuits devices. In the present paper, we review recent results of investigations on the effects of stress and high temperature sputtering on the formation of C54-TiSi2. Enhanced formation of C54-TiSi2 on (001)Si by tensile stress and high temperature sputtering is correlated to the growth of thicker amorphous interlayer at the Ti/(001)Si interface. The enhanced transformation is attributed to the presence of higher density of silicide crystallites, which serve as the nucleation sites for the C49-TiSi2, in the amorphous layer. As a result, the average grain size of C49-TiSi2 is smaller which leads to lower C49- to C54-TiSi2 transformation temperature.
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