Semiconductor device comprising an active layer and a Schottky contact
View Patent ↗A semiconductor device comprising at least one active layer on a substrate and a a Schottky contact to the at least one active layer, the Schottky contact comprising a body of at least titanium and nitrogen that is electrically coupled with the at least one active layer.
1. A semiconductor device comprising at least one active layer on a substrate and a Schottky contact to the at least one active layer, the Schottky contact comprising a body of at least titanium and nitrogen that is electrically coupled with the at least one active layer;
in which the body of the Schottky contact comprises a first TiW sub-layer nearest to the at least one active layer, a second TiW sub-layer farthest from the at least one active layer, and a TiW(N) sub-layer in-between the first and second TiW sub-layers.
2. A semiconductor device according to claim 1 , in which the TiW(N) sub-layer has a thickness exceeding the combined thickness of the first and second TiW sub-layers such that the properties of the sub-layer stack are dominated by the TiW(N) sub-layer.
3. A semiconductor device according to claim 1 , in which the Schottky contact comprises a stack having an active layer portion adapted to be coupled to the at least one active layer and a connection portion coupled to the active layer portion for providing a connection to the Schottky contact, wherein the body forms the active layer portion and the connection portion has a lower resistance than the active layer portion.
4. A semiconductor device according to claim 3 , in which the connection portion comprises Aluminium.
5. A semiconductor device according to claim 1 , in which the Schottky contact is laterally delimited by an electrically insulating material.
6. A semiconductor device according to claim 1 , in which the semiconductor device comprises a gallium nitride active layer.
7. An integrated circuit including the semiconductor device as defined in claim 1 .