Patent ID: 7183627
Filing Date: 2007-02-27
Classification: H01L

Abstract:
1. A structure comprising: a collector comprising a single crystal silicon; a base comprising kinetically controlled growth mode single crystal silicon-germanium, wherein said base is grown at a first temperature and a first pressure of a precursor gas, said base and said collector forming a base-collector junction; an emitter comprising polycrystalline silicon, said emitter and said base forming a base-emitter junction; a base contact comprising mass controlled growth mode polycrystalline silicon-germanium, said base contact being in electrical contact with said base, wherein said base contact is grown at said first pressure and said first temperature of said precursor gas, wherein said base contact is situated over and in contact with a silicon oxide structure, and wherein said silicon oxide structure is situated in a substrate; wherein said base contact and said base are characterized by a controlled deposition ratio, wherein said controlled deposition ratio causes said base contact to have a reduced resistance, and wherein said controlled deposition ratio provides a base contact deposition rate that is higher than a base deposition rate so as to cause a base contact thickness to be greater than a base thickness.