Patent ID: 7625792

Claim:
A method of making a transistor, said method comprising: forming an extrinsic base above an intrinsic base, wherein before forming said extrinsic base; patterning an insulator over said center of said intrinsic base; and epitaxially growing said extrinsic base over said insulator and said intrinsic base; protecting a portion of said extrinsic base using a sacrificial mask that is positioned over a center of said extrinsic base; siliciding exposed portions of said extrinsic base, wherein said siliciding process leaves a non-silicided portion over said center of said extrinsic base; forming an emitter opening though a center of said non-silicided portion of said extrinsic base; forming spacers in said emitter opening; and forming an emitter in said emitter opening, wherein said spacers separate said emitter from silicided portions of said extrinsic base.