Patent ID: 8541297

Claim:
A manufacturing method of a semiconductor device, comprising the steps of: (a) preparing a semiconductor substrate; (b) forming a semiconductor region in the semiconductor substrate; (c) forming a metal film over the semiconductor substrate including over the semiconductor region; (d) forming a metal silicide layer at the upper part of the semiconductor region by applying a first heat treatment and selectively reacting the metal film with the semiconductor region; (e) after the process (d), removing the unreacted part of the metal film and keeping the metal silicide layer over the semiconductor region; (f) after the process (e), applying a second heat treatment, the heat treatment temperature of which is higher than that of the first heat treatment; and (g) after the process (f), forming an insulation film over the semiconductor substrate including over the metal silicide layer, wherein the first heat treatment in the process (d) is applied at 250° C. to 300° C., wherein a temperature-rise rate in an annealing apparatus for applying the first heat treatment in the process (d) is 250° C./sec, to 500° C./sec., wherein the metal silicide layer formed through the first heat treatment in the process (d) contains NiSi, and wherein crystal grain sizes of NiSi in the metal silicide layer formed through the first heat treatment in the process (d) are not more than one third of crystal grain sizes of NiSi in the metal silicide layer after the second heat treatment in the process (f).