Patent ID: 6821824
Filing Date: 2004-11-23
Classification: H01L

Abstract:
A semiconductor device having a repeating structure wherein a structure where a first impurity region of a first conductive type and a second impurity region of a second conductive type are aligned side by side is repeated twice, or more, in a semiconductor substrate of the first conductive type, whereinthe semiconductor device is characterized in that a low concentration region that is either said first or second impurity region located at the outermost portion of said repeating structure has the lowest impurity concentration or has the least generally effective charge amount from among all of said first and second impurity regions forming said repeating structure, and characterized in that the impurity concentration of said low concentration region is no lower than 30% and no higher than 70% of the impurity concentration of a high concentration region that is either said first or second impurity region located closer to the center portion of said repeating structure than is said lower concentration region.