Patent ID: 7696072

Claim:
A method for introducing impurities, comprising: a first step for irradiating a plasma containing Helium (He) to a surface of a single crystalline film so as to form an amorphous layer only in an upper portion of the single crystalline film; a second step for introducing impurities into the surface of the single crystalline film at which the amorphous layer has been formed , and an annealing step after the second step, wherein a bias voltage in time of irradiating the plasma is more than 30V (inclusive) and less than 310V (inclusive), wherein the annealing step is a step for activating the impurities, wherein the first step and the second step are performed in the same process chamber as sequential processes in-situ, wherein the irradiating time regarding the plasma is not shorter than 5 seconds (inclusive) and shorter than 70 seconds (inclusive), wherein the single crystalline film is a semiconductor substrate, and wherein the semiconductor substrate is made of silicon.