Patent ID: 8178899
Filing Date: 2012-05-15
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate; a first nitride based compound semiconductor layer placed on the substrate and doped with a first transition metal atom; an aluminum gallium nitride layer (Al a second nitride based compound semiconductor layer placed on the aluminum gallium nitride layer (Al an aluminum gallium nitride layer (Al a gate electrode, a source electrode, and a drain electrode which are placed on the aluminum gallium nitride layer (Al a first two-dimensional electron gas layer formed in an interface of the first nitride based compound semiconductor layer and the aluminum gallium nitride layer (Al a second two-dimensional electron gas layer formed in an interface of the aluminum gallium nitride layer (Al a third two-dimensional electron gas layer formed in an interface of the second nitride based compound semiconductor layer and the aluminum gallium nitride layer (Al a layered structure in which a multi-layered structure is formed, the multi-layered structure being composed of the first nitride based compound semiconductor layer doped with the first transition metal atom, the aluminum gallium nitride layer (Al the first transition metal atom and the second transition metal atom are ferrum (Fe) and the first nitride based compound semiconductor layer and the second nitride based compound semiconductor layer are made semi-insulating through impurity doping of the ferrum (Fe) atom more than 7×10 each of a thickness of the first nitride based compound semiconductor layer and the second nitride based compound semiconductor layer is more than 1 micrometer, the second two-dimensional electron gas layer is made to electrically ground state in high frequency operational region of the semiconductor device through a capacitor formed between the second two-dimensional electron gas layer and the third two-dimensional electron gas layer by the second nitride based compound semiconductor layer being made insulating, and the first two-dimensional electron gas layer is made to electrically ground state in high frequency operational region of the semiconductor device through a capacitor formed between the first two-dimensional electron gas layer and the substrate by the first nitride based compound semiconductor layer being made insulating.