Patent ID: 6599795
Filing Date: 2003-07-29
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device having DRAM circuit region and logic circuit region furnished on a semiconductor substrate, the method comprising the steps of:forming a gate insulating film on said DRAM circuit region and said logic circuit region of said semiconductor substrate; forming gate electrodes on said gate insulating film; oxidizing sidewalls of said gate electrodes; forming a first insulating film all over said semiconductor substrate; leaving a sidewall insulating film on the both sides of said gate electrodes by removing said first insulating film from said logic circuit region except sidewalls of said gate electrodes; forming a diffusion layer in said semiconductor substrate in said logic circuit region by implanting ions with said first insulating film and said sidewall insulating film used as a mask; forming a protection film on said first insulating film in said DRAM circuit region and on said logic circuit region except for regions of said diffusion layer around some gate electrodes; and forming a conductive layer in an upper layer portion of said regions of said diffusion layer; wherein a step of removing said protection film on said first insulating film in said DRAM circuit region is carried out after finishing the above steps.