Patent ID: 7096129

Claim:
A method for analyzing a profile of impurity concentration within an implanted pocket comprising steps of: obtaining an approximated profile by using penetration length of a pocket penetrating into a substrate in a channel direction and maximum impurity concentration in the pocket as parameters to linearly approximate a profile of impurity concentration within the substrate in the channel direction; predicting the threshold voltage based on the approximated profile obtained; analytically solving a model of the threshold voltage to obtain the threshold voltage under a condition in which the threshold voltage is obtained by integrating density of electric charges in an inversion layer over a whole channel area when the density of electric charges in the inversion layer reaches a predetermined threshold value; fitting parameters for providing the profile of impurity concentration within the implanted pocket in the depth direction of the substrate by means of the obtained threshold voltage and a threshold voltage actually measured; and estimating the profile of the impurity concentration within the implanted pocket in the depth direction based on the parameters optimally fitted to the threshold voltage actually measured.