Patent ID: 7091114

Claim:
A method for manufacturing a semiconductor device comprising: implanting ions of an impurity element into a semiconductor region; implanting, into the semiconductor region, ions of a predetermined element which is a group IV element or an element having the same conductivity type as the impurity element and larger in mass number than the impurity element; and annealing an amorphous region into which the ions of the impurity element and the predetermined element are implanted by irradiating the amorphous region with light of a flash lamp to activate the implanted ions of the impurity element and form an impurity diffusion layer containing the activated implanted ions, the impurity diffusion layer having a junction depth of 20 nm or less, wherein annealing the amorphous region by irradiating the amorphous region with the light of the flash lamp is performed with the semiconductor region preheated under a condition that an amorphous state of the amorphous region is maintained.