Patent ID: 8921931

Claim:
A semiconductor device comprising: a semiconductor body comprising: a doped layer of a first conductivity type; and a doped zone of a second conductivity type opposite to the first conductivity type, wherein the doped zone is formed between the doped layer and a first surface of the semiconductor body; and trench structures extending from one of the first and a second opposing surface into the semiconductor body, the trench structures arranged between electrically connected portions of the semiconductor body, each trench structure comprising a combination structure at the bottom of each of one or more of the trench structure, each of the recombination structures directly adjoining the doped zone and each recombination structure exhibiting a surface recombination rate of at least 10 4 cm/s at an interface to the doped zone, and a fill structure separating the recombination structure form the first surface at least in a direction perpendicular to the first surface, the fill structure being either (i) conductive and not concurrently electrically connected to both the recombination and any other conductive structure outside the trench structure, or (ii) non-conductive.