SEMICONDUCTOR DEVICE AND METHOD OF MANUFACTURING SUCH A DEVICE

摘要

The invention relates to a semiconductor device (10) with a substrate (12) and a semiconductor body (11) of silicon comprising a bipolar transistor with an emitter region, a base region and a collector region (1,2,3) of a first conductivity type, a second conductivity type opposite to said first conductivity type and the first conductivity type, respectively, with a first semiconductor region (3) comprising the collector region or the emitter region being formed in the semiconductor body (11), on top of which a second semiconductor region (2) comprising the base region is present, on top of which a third semiconductor region (1) comprising the other of said collector region and said emitter region is present, said semiconductor body (11) being provided with a constriction at the location of the transition between the first and the second semiconductor region (3, 2) , which constriction has been formed by means of an electrically insulating region (26, 27) buried in the semiconductor body (11). According to the invention a part of the semiconductor body that is formed above the buried electrically insulating region (26,27) is monocrystalline. This enables a strong lateral miniaturization of the device and results in excellent high frequency properties of the transistor. Such a device (10) is possible thanks to its manufacture with a method of manufacturing according to the invention.