Patent ID: 7569455
Filing Date: 2009-08-04
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming an n-type well and a p-type well on a semiconductor substrate; enclosing upper ends of the n-type well and the p-type well with an isolation film; forming a gate insulating film on the n-type well and the p-type well enclosed with the isolation film; forming gate electrodes on the gate insulating film of the n-type well and the p- type well; forming first sidewall insulating films on the sidewalls of the gate electrodes; forming a first source/drain region and a second source/drain region on upper surfaces of the n-type well and the p-type well by ion-implanting p-type impurities and n-type impurities, respectively, using the gate electrodes and the first sidewall insulating films as masks; ion-implanting the n-type impurities into the p-type well while masking the n-type well with a first film after removing the first sidewall insulating films in order to form a first source/drain extension region shallower than the first source/drain region and to implant the n-type impurities into the gate electrodes of the p-type well; carrying out first annealing having a first temperature increase/decrease rate after removing the first film in order to diffuse the p-type impurities and the n-type impurities to bottoms of the gate electrodes; masking the p-type well with a second film and ion-implanting the p-type impurities into the n-type well after carrying out the first annealing in order to form a second source/drain extension region shallower than the second source/drain region; and carrying out, after removing the second film, second annealing having a second temperature increase/decrease rate higher than the first temperature increase/decrease rate after removing the second film in order to activate the p-type impurities and the n-type impurities implanted in the gate electrodes, the first and second source/drain regions and the first and second source/drain extension regions, while suppressing diffusion of the p-type impurities from the second source/drain region and the second source/drain extension region.