Patent ID: 6337494
Filing Date: 2002-01-08
Classification: H01L

Abstract:
A super self-aligned heterojunction bipolar transistor comprising:a semiconductor substrate having a buried collector; a first insulating film formed on the buried collector; a second insulating film formed on the first insulating film; a conducting layer for a base electrode formed on the second insulating film, the first insulating film being formed at sidewalls of the second insulating film and the conducting layer; a collector surrounded by the first insulating film, and formed on the buried collector in an active region of the transistor defined by patterning the conducting layer, the first insulating film, and the second insulating film, the first insulating film separating the conducting layer and the collector; a multi-layer intrinsic base formed on the collector; a multi-layer extrinsic base formed on the conducting layer and the first insulating film; an emitter formed on the intrinsic base; a spacer formed at both sidewalls of the emitter; a third insulating film formed under the spacer so that the emitter is separated from the conducting layer for the base electrode; a metallic silicide thin film formed on the base electrode and an emitter electrode; a fourth insulating layer formed on an entire surface of the above semi-finished structure; and metallic interconnections formed on the base electrode, the emitter electrode, and the buried collector.