Patent ID: 6228732
Filing Date: 2001-05-08
Classification: H01L

Abstract:
A method of forming the extrinsic emitter of a bipolar junction transistor on a surface of a monocrystalline silicon substrate, said transistor having a predetermined current gain and said surface of the monocrystalline silicon substrate having a layer of oxide thereon, the method comprising the steps of:determining a predetermined thickness of an interfacial layer of silicon nitride necessary to provide the predetermined current gain according to a schedule correlating current gain with the thickness of the interfacial layer of silicon nitride, wherein the predetermined thickness is less than or equal to about 4 nanometers;forming the interfacial layer of silicon nitride having the predetermined thickness on the monocrystalline silicon substrate, anddepositing a layer of polycrystalline silicon over the interfacial layer of silicon nitride.