Patent ID: 8138575
Filing Date: 2012-03-20
Classification: H01L

Abstract:
1. An integrated circuit comprising: a semiconductor substrate of a first conductivity type; a first semiconductor well and a second semiconductor well, each of a second conductivity type formed adjacently to one another and insulated from one another in the same semiconductor substrate, wherein surfaces of the first semiconductor well, and the second semiconductor well define a main area; electrode patterns of a power transistor including a reverse-current injecting electrode pattern of the power transistor are formed in the first semiconductor well; an insulating material placed in a deep trench structure extending from the main area into the semiconductor substrate for providing insulation between the first semiconductor well and the second semiconductor well, the deep trench structure comprising two intermediate trenches extending into the semiconductor substrate, wherein the two intermediate trenches are lined with an insulating material and filled with a material comprised of polysilicon; a third semiconductor well of the first conductivity type extending from the main area into the first semiconductor well such that the third semiconductor well is provided between the main area and the first semiconductor well, the third semiconductor well directly connected to ground potential or to a potential which is more negative compared with the ground potential; and at least one reverse-current complex formed between the reverse-current injecting electrode pattern of the power transistor and the insulating material, said at least one reverse current complex having in each case a reverse-current-absorbing semiconductor zone of the second conductivity type which is located in the third semiconductor well and connected to the semiconductor substrate via a substrate connection extending through the deep trench structure between the insulating material of the two intermediate trenches.