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The phase transition from pure Ni to Ni 2 Si and NiSi was studied by in situ Transmission Electron Microscopy analyses from room temperature to 260degC. The reaction starts at 180degC with the formation of small Ni 2 Si transrotational domains. Their density and size increase by increasing the annealing temperature to 260degC. After 50 min, a uniform transrotational NiSi layer is formed by a grain by grain transition process. A polycrystalline NiSi layer was instead obtained at 550degC. It was concluded that the final layer structure is the result of a competition: at low temperature (260degC) transrotational domains prevails since slow structural modifications allow the match between silicide and silicon during the Ni 2 Si -NiSi phase transition ; at high temperature (550deg), the growth of randomly oriented silicide grains is favoured.
Publication date: 
2 Oct 2007

Alessandra Alberti, Corrado Bongiorno, Paola Alippi, Antonino La Magna, Corrado Spinella, Emanuele Rimini

Biblio References: 
Pages: 151-153
2007 15th International Conference on Advanced Thermal Processing of Semiconductors