Patent ID: 6323538
Filing Date: 2001-11-27
Classification: H01L

Abstract:
A bipolar transistor comprising:a first semiconductor layer of a first conductivity type, which is formed over a semiconductor substrate;a second semiconductor layer of a second conductivity type, which is formed over the first semiconductor layer with an insulating film interposed therebetween;a third semiconductor layer of the second conductivity type, which is formed on side faces of the first and second semiconductor layers and the insulating film;a fourth semiconductor layer of the first conductivity type, which is formed on a side of the third semiconductor layer, the side being opposite to the other side of the third semiconductor layer that is in contact with the first and second semiconductor layers; anda fifth semiconductor layer of the first conductivity type, which is formed over the semiconductor substrate to be in contact with the fourth semiconductor layer,wherein the third semiconductor layer is defined as a base region, andwherein the first semiconductor layer is defined as one of collector and emitter regions, andwherein the fourth semiconductor layer is defined as the other of the collector and emitter regions, andwherein the second semiconductor layer is defined as an extension of the third semiconductor layer, andwherein the fifth semiconductor layer is defined as an extension of the fourth semiconductor layer.