Patent ID: 9660061
Date: 2017-05-23
CPC Classifications: H01L

Claim:
1. A semiconductor device provided with a bipolar transistor, comprising: a semiconductor substrate; a first semiconductor region of a first conductivity type which is disposed in the semiconductor substrate; a second semiconductor region of the first conductivity type and a third semiconductor region of a second conductivity type opposite to the first conductivity type which are disposed to be spaced apart from each other in the first semiconductor region; an element isolation insulating film which is disposed on a main surface of the semiconductor substrate between the second semiconductor region and the third semiconductor region; a first electrode which is disposed on the element isolation insulating film; an interlayer insulating film which is disposed on the semiconductor substrate so as to cover the element isolation insulating film and the first electrode; and a first plug, a second plug, and a third plug which are buried in the interlayer insulating film, wherein an impurity concentration of the second semiconductor region is higher than an impurity concentration of the first semiconductor region, wherein the first semiconductor region and the second semiconductor region are base semiconductor regions of the bipolar transistor, wherein the third semiconductor region is an emitter semiconductor region of the bipolar transistor, wherein the first plug is disposed on the third semiconductor region and is electrically connected to the third semiconductor region, wherein the second plug is disposed on the first electrode and is electrically connected to the first electrode, wherein the third plug is disposed on the second semiconductor region and is electrically connected to the second semiconductor region, wherein the first plug and the second plug are electrically connected, wherein the first electrode is disposed between the second semiconductor region and the third semiconductor region in a plan view, wherein at least a part of the first electrode is buried in a first trench which is disposed in the element isolation insulating film, wherein the first trench is disposed between the second semiconductor region and the third semiconductor region in the plan view, wherein the semiconductor device further comprises: a fourth semiconductor region of the second conductivity type which is disposed in the semiconductor substrate so as to enclose the first semiconductor region; a fifth semiconductor region of the second conductivity type which is disposed in the fourth semiconductor region spaced apart from the first semiconductor region; and a fourth plug which is buried in the interlayer insulating film, wherein the fourth semiconductor region and the fifth semiconductor region are collector semiconductor regions of the bipolar transistor, and wherein the fourth plug is disposed on the fifth semiconductor region and is electrically connected to the fifth semiconductor region.