Patent ID: 6677194
Filing Date: 2004-01-13
Classification: H01L

Abstract:
A method of manufacturing a semiconductor integrated circuit device including a semiconductor substrate and at least one first transistor having a first conductivity type and at least one second transistor having a second conductivity type opposite to the first conductivity type, the first and second transistors being formed on the semiconductor substrate, comprising:a first step of forming a gate insulating film on one surface of the semiconductor substrate; a second step of depositing a gate material film using material for gates on the gate insulating film; a third step of forming first photoresist covering a second area in which the second transistor is formed, the first photoresist having an opening in a first area in which the first transistor is formed; a fourth step of conducting ion implantation using the first photoresist as a mask for formation of a well, threshold voltage control, and gate doping of the first transistor; a fifth step of removing the first photoresist; a sixth step of forming second photoresist covering the first area and having an opening in the second area; a seventh step of conducting ion implantation using the second photoresist as a mask for formation of a well, threshold voltage control, and gate doping of the second transistor; and an eighth step of removing the second photoresist.