Patent ID: 7297617
Filing Date: 2007-11-20
Classification: H01L

Abstract:
1. A method of reducing a dopant diffusion rate in a doped semiconductor region comprising: selecting a plurality of impurity elements including at least one dopant element; including: selecting a first impurity element with a first atomic radius larger than an average host matrix atomic radius; selecting a second impurity element with a second atomic radius smaller than the average host matrix atomic radius; selecting a third impurity element with a third atomic radius that is different from the average host matrix atomic radius; selecting amounts of each impurity element of the plurality of impurity elements wherein amounts and atomic radii of each of the plurality of impurity elements are selected to provide an average impurity element atomic radius over the doped semiconductor region that is substantially the same as the average host matrix atomic radius; introducing the plurality of impurity elements to a selected region of the host matrix; and annealing the selected region of the host matrix.