Patent ID: 7435665

Claim:
A CVD (Chemical Vapor Deposition) growing process of high concentration dopant doped silicon layers comprising epitaxial silicon or polycrystalline silicon on a substrate, wherein the dopant concentration is at least 1×10 19 /cm 3 and the process is a high temperature process wherein a high temperature range extends from 900° C.-1250° C., comprising: baking the substrate in a reactor to a baking temperature of 900° C.-1250° C.; feeding a halide into the reactor, at the high temperature range, for enhancing at least one of process purity and reactor purity; feeding a silicon comprised halide as a silicon source gas into the reactor, at the high temperature range, during a growing phase; feeding a substance comprising the dopant into the reactor, at the high temperature range, during the growing phase; heating the substrate in the reactor at a growing temperature of 900° C.-1250° C., during the growing phase; removing the substrate from the reactor; cooling the reactor; and cleaning the reactor at a cleaning temperature after said cooling; wherein the substance comprising the dopant comprises at least one of the following: a B-halide, BCl 3 , and BCl 3 in combination with GeCl 4 , wherein the silicon source gas comprises at least one of the following: a Si-halide, DCS, TCS, and SiCl 4 ; and wherein a combination of the silicon source gas and the substance comprising the dopant is a combination other than a combination consisting of TCS and BCl 3 dopant, and is a combination other than a combination consisting of DCS and GeCl 4 .