Patent ID: 6684181
Filing Date: 2004-01-27
Classification: G06F

Abstract:
An ion implantation simulation method for obtaining an impurity distribution and a point defect distribution to be generated by ion implantation in each layer of a multilayer substrate by simulation using analytical equations comprising the steps of:determining the point defect distribution in a layer of the multilayer substrate assuming that the ion implantation generates point defect distribution so as to satisfy the relationship between the point defect distribution and the impurity distribution, according to the following equation: &Integral;xskâˆž&it;fdk&af;(x)&it;â€ƒ&it;&dd;x=Fk&it;&Integral;xskâˆž&it;fd&af;(x)&it;â€ƒ&it;&dd;xwherein, fdk(x) is the point defect distribution for the k-th layer, fk(x) is the impurity distribution for the k-th layer, Fk is (total amount of point defects)/(total amount of impurities) for the k-th layer, x is the coordinate in the depthwise direction of the multilayer substrate, and xsk is the transformed surface coordinate of a layer for which the material is converted into that of the k-th layer of the substrate;wherein said Fk is obtained in advance using the impurity distribution f(x) and the point defect distribution fd(x) of a bare semiconductor substrate or a semiconductor substrate with a thin film in which point defects are not defined by calculation based on the Monte Carlo ion implantation simulation method for conditions in which channeling does not occur, according to the following equation: Fk=&Integral;0âˆž&it;fd&it;â€ƒ(x)&it;&dd;x&Integral;0âˆž&it;f&af;(x)&it;â€ƒ&it;&dd;x.