Patent ID: 8021952
Filing Date: 2011-09-20
Classification: H01L

Abstract:
1. A method for the production of a transistor comprising: forming a first connection region remote from a main area in a semiconductor substrate main region, the first connection region being doped in accordance with a basic doping type and being arranged at a distance from a main area of the semiconductor substrate; forming a drift region, which is doped in accordance with the basic doping type with a lower dopant concentration than the first connection region and is arranged between the first connection region and the main area; forming a second connection region near the main area, the second connection region being doped in accordance with the basic doping type and being arranged nearer to the main area of the substrate than the first connection region; forming a reverse doping region, which is doped in accordance with a different doping type than the basic doping type and separates the drift region from the second connection region; forming an electrically insulating isolating trench extending from the main area in the direction of the first connection region; and forming an auxiliary trench extending from the main area as far as the connection region remote from the main area; wherein a doping of the basic doping type with a higher dopant concentration than in the drift region is arranged between the isolating trench and the auxiliary trench, the doping filling only a region in a vicinity of the auxiliary trench and not in a vicinity of the isolating trench.