Patent ID: 8853065
Filing Date: 2014-10-07
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, the method comprising: selecting an element for implanting into a substrate, the element having at least a first isotope and a second isotope; identifying a presence of at least one implant contaminant by comparing a theoretical isotope ratio for the element to an actual isotope ratio for the element calculated from beam current measurements of the isotopes of the element generated during an ionization process; and selectively implanting ions of the second isotope of the element into a region of the substrate responsive to identifying the presence of the at least one implant contaminant, wherein the first isotope has an atomic weight that is substantially identical to a particle weight of the at least one identified implant contaminant, and wherein the second isotope has an atomic weight that is different from the particle weight of the at least one implant contaminant.