Patent ID: 6127720
Filing Date: 2000-10-03
Classification: H01L

Abstract:
A semiconductor device, comprising:a one-conductive collector area with a predetermined density;a one-conductive semiconductor substrate area on the collector area, which has a first thickness in a predetermined region and a lower density than that of the collector area;a second conductive base area formed in the predetermined region on the semiconductor substrate area, which has a second thickness D3; anda one-conductive emitter area formed in a region of a surface layer of the base area;a wide and shallow first groove provided around the base area, wherein a depth D1 of the first groove from a surface of the base area is shallower than a thickness D3 of the base area;a second groove having a narrower width than that of the first groove provided in the first groove area, wherein a depth D2 of the second groove from the surface of the base area is shallower than a total thickness d2 of the semiconductor substrate area and the base area formed thereon; andan electrical insulator covering at least the second groove.