Patent ID: 6194242
Filing Date: 2001-02-27
Classification: H01L

Abstract:
A fabrication method of a solid-state imaging device having photoelectric converter elements arranged in a matrix array; vertical charge-transfer sections arranged along respective columns of said matrix array; a horizontal charge-transfer section disposed at output-side ends of said vertical charge-transfer sections; and an output section disposed at an output-side end of said horizontal charge-transfer section;said method comprising:a first step of forming a diffusion region of a first conductivity type in a surface region of a semiconductor substrate; said diffusion region having a pattern for said vertical charge-transfer sections and said horizontal charge-transfer section;a second step of forming a gate oxide film on said surface region of said substrate;a third step of forming gate electrodes on said gate oxide film to be arranged along said respective vertical charge-transfer sections;a fourth step of forming a patterned masking film to cover said vertical charge-transfer sections and to uncover said horizontal charge-transfer section; ends of said gate electrodes being exposed from said masking film; anda fifth step of selectively ion-implanting a dopant into said diffusion region using said masking film and said gate electrodes, forming a first plurality of buried channel regions in said respective vertical charge-transfer regions and a second buried channel region in said horizontal charge-transfer region;wherein interfaces between said first plurality of buried channel regions and said second buried channel region are determined in self-alignment with said ends of said gate electrodes, respectively.