Patent ID: 7105387

Claim:
A manufacturing method for a semiconductor device having a first impurity region of a first conductive type and a second impurity region of a second conductive type aligned side by side and repeated twice or more in a semiconductor substrate of the first conductive type, the method comprising: ion implanting to form a low concentration region that is either said first or second impurity region located at the outermost portion of said repeating structure and ion implanting to form said first and second impurity regions other than the low concentration region to have independently changed concentrations so that said low concentration region has the lowest impurity concentration or has the least generally effective charge amount among all of said first and second impurity regions forming said repeating structure; wherein the concentrations have been independently changed and the implantation energies have been changed according to multiple levels in order to form said low concentration region and said other first and second impurity regions of which the concentrations have been independently changed.