Patent ID: 7863679

Claim:
A semiconductor apparatus comprising: a semiconductor substrate including a trench; a gate electrode layer having a prescribed impurity concentration and being formed inside the trench; a source layer formed inside the semiconductor substrate and formed around the trench; a source electrode formed on a front surface of the substrate; and a cap insulating layer formed on the gate electrode layer and in an area which corresponds to an area where the gate electrode layer is formed such that the source layer and the source electrode are in direct contact with each other, wherein the cap insulating layer has a lower impurity concentration than the impurity concentration of the gate electrode layer, and at least a portion of the cap insulating layer is formed in the trench, and wherein the cap insulating layer comprises: a glass film formed in the trench on the gate insulating film and including a depressed portion; and an oxide layer formed in the trench on the depressed portion of the glass film.