Patent ID: 7732269
Filing Date: 2010-06-08
Classification: H01L

Abstract:
1. A method of forming an ultra shallow junction on a substrate in a process chamber, the method comprising: positioning a substrate comprising a monocrystalline surface and at least one secondary surface that is non-monocrystalline in the process chamber; epitaxially depositing a silicon carbon layer on the monocrystalline surface while forming a polycrystalline layer on the secondary surface of the substrate; exposing the substrate to an etching gas to remove both epitaxial and polycrystalline layers from the substrate, wherein the polycrystalline layers are removed at a faster rate than the epitaxial layers; purging the process chamber of the etching gas; repeating the epitaxially depositing a silicon carbon layer on the monocrystalline surface, exposing the substrate to an etching gas, and purging the process chamber of the etching gas until a predetermined thickness of the silicon carbon layer is achieved; exposing the substrate to a dopant; and heating the substrate to a temperature greater than 950° C. so as to cause substantial annealing of the dopant with the silicon carbon layer to form an ultra shallow junction having a dopant profile of about 3 nm/decade.