Patent ID: 6329699
Filing Date: 2001-12-11
Classification: H01L

Abstract:
A semiconductor device comprising:a bipolar transistor formed in a transistor area; andan isolation area formed of dielectric material around the transistor area,said bipolar transistor further comprising a base area formed around an emitter area formed at a central area of the transistor area, and a base electrode contacting said base area;said isolation area further comprising a contact groove formed at an inner surface of the isolation area facing an outer surface of the transistor area, and wherein a part of said base electrode is embedded in said contact groove so that said base electrode contacts an upper surface of said base area and a lateral surface of said base area;wherein said contact groove is formed by etching said dielectric material to a constant depth and said part of said base electrode is formed by filling an electrode material in said contact groove; andwherein said base electrode contacts only said upper surface of said base area on one side of said base area, and contacts both said upper surface and said lateral surface of said base area on an other side of said base area.