Patent ID: 7863168

Claim:
A plasma doping method for doping impurities into a sample or into a film on a surface of the sample, comprising: a first step of placing said sample on a sample electrode in a vacuum chamber; a second step of evacuating said vacuum chamber while supplying a gas containing an inert gas other than helium into said vacuum chamber, and supplying high frequency electric power to a plasma source while controlling the pressure of said vacuum chamber at a first pressure so as to generate plasma in said vacuum chamber; and a third step of evacuating said vacuum chamber while supplying a gas containing helium into said vacuum chamber and then controlling the pressure of said vacuum chamber into a second pressure, while maintaining the generated plasma, wherein the first pressure is 1 Pa through 10 Pa, while the second pressure is 0.01 pa through 1 Pa and wherein said doping method provides doping of impurities into said sample or into a film on a surface of said sample.