Patent ID: 9666663
Date: 2017-05-30
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: first cell trench structures comprising a first buried electrode; second cell trench structures comprising a second buried electrode electrically separated from the first buried electrode, the first and second cell trench structures extending from a first surface into a semiconductor substrate, first semiconductor mesas separating first and second cell trench structures and comprising a source zone of a first conductivity type and a body zone of a second conductivity type that is complementary to the first conductivity type at a first distance to the first surface, the source zone extending along the first surface from the first cell trench structure to the second cell trench structure, and the body zone comprising a contact zone along a sidewall portion of the first semiconductor mesa, second semiconductor mesas separating first cell trench structures from each other, wherein the first cell trench structures comprise first insulator layers and first vertical sections of the first insulator layers separate the first buried electrodes from the first semiconductor mesas; a capping layer on the first surface, the capping layer sandwiched between an electrode structure and the second semiconductor mesas and structurally separating the electrode structure from the second semiconductor mesas; and first contact structures physically disconnected from the second semiconductor mesas, each first contact structure comprising a first section directly connected to the electrode structure in an opening of the capping layer and a second section sandwiched between one of the first semiconductor mesas and one of the first buried electrodes and directly adjoining the source and the contact zones in the respective first semiconductor mesa, wherein the first cell trench structure separates the second section from a neighboring one of the second semiconductor mesas, a vertical extension of the second section is greater than the first distance, and only one first contact structure is formed per first semiconductor mesa.