Patent ID: 8518810
Filing Date: 2013-08-27
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming a resist layer having a uniform film thickness on a semiconductor substrate; exposing the resist layer using an exposure mask having a plurality of transmission regions whose transmittances change toward a transfer direction of charges; developing the exposed resist layer and thereby forming a plurality of residual resist films whose film thicknesses change according to the transmittances of the exposure mask; and forming, within the semiconductor substrate, a plurality of impurity layers having an inner potential including a predetermined reference potential and a predetermined step potential by implanting ions using an ion implantation device into the semiconductor substrate through the residual resist films, wherein an acceleration voltage and a dose amount of the ion implantation device are determined so that an error of the inner potential caused by an error of the film thicknesses of the residual resist films stays within a permissible range.