Patent ID: 7501332
Filing Date: 2009-03-10
Classification: H01L,Y10S

Abstract:
1. A doping method, comprising: implanting first impurity ions into a semiconductor substrate by a plasma source ion implantation to form a damaged region in the vicinity of a surface of the semiconductor substrate, the first impurity ions not contributing to electric conductivity of the semiconductor substrate; forming an irregularity on the surface of the semiconductor substrate by sputtering the surface of the semiconductor substrate in the plasma source ion implantation; implanting second impurity ions into the semiconductor substrate through the damaged region, the second impurity ions having an atomic weight larger than the first impurity ions and contributing to the electric conductivity; and heating the surface of the semiconductor substrate with a flash lamp light having a pulse width of about 0.1 ms to about 100 ms to activate the second impurity ions, wherein a pitch of the irregularity is less than a peak wavelength of the flash lamp light.