Patent ID: 9269778
Filing Date: 2016-02-23
CPC Classification: H01L

Claim Text:
1. A semiconductor apparatus comprising: a semiconductor substrate that has a diameter of 2 inches or larger; an N-type semiconductor layer that is stacked on the semiconductor substrate using a material including gallium nitride (GaN); and a P-type semiconductor layer formed on the N-type semiconductor layer; wherein a median of a plurality of measured values of concentration of carbon (C) at a plurality of locations on a face of a region of the N-type semiconductor layer is equal to or lower than 1.0×10 wherein the N-type semiconductor layer includes silicon as a donor, a median of a plurality of measured values of concentration of the silicon at a plurality of locations on the face of the region of the N-type semiconductor layer is equal to or less than 1.4×10 wherein a concentration of carbon in the P-type semiconductor layer is greater than a concentration of carbon in the N-type semiconductor layer.