Methods of manufacturing engineered substrate structures for power and RF applications
A method of manufacturing a substrate includes forming a support structure by providing a polycrystalline ceramic core, encapsulating the polycrystalline ceramic core in a first adhesion shell, encapsulating the first adhesion shell in a conductive shell, encapsulating the conductive shell in a second adhesion shell, and encapsulating the second adhesion shell in a barrier shell. The method also includes joining a bonding layer to the support structure, joining a substantially single crystalline silicon layer to the bonding layer, forming an epitaxial silicon layer by epitaxial growth on the substantially single crystalline silicon layer, and forming one or more epitaxial III-V layers by epitaxial growth on the epitaxial silicon layer.
1. A method of manufacturing a substrate, the method comprising:
forming a support structure by:
providing a polycrystalline ceramic core;
forming a first adhesion layer coupled to the polycrystalline ceramic core;
forming a conductive layer coupled to the first adhesion layer;
forming a second adhesion layer coupled to the conductive layer; and
forming a barrier layer coupled to the second adhesion layer;
forming a bonding layer coupled to the support structure;
joining a substantially single crystalline silicon layer to the bonding layer; and
forming one or more epitaxial III-V layers coupled to the substantially single crystalline silicon layer.
2. The method of claim 1 wherein the polycrystalline ceramic core comprises aluminum nitride.
3. The method of claim 2 wherein the one or more epitaxial III-V layers comprise an epitaxial gallium nitride layer.
4. The method of claim 3 wherein the epitaxial gallium nitride layer has a thickness of about 5 μm or greater.
5. The method of claim 3 wherein the one or more epitaxial III-V layers further comprise an epitaxial aluminum nitride layer, or an epitaxial aluminum gallium nitride layer, or a combination thereof.
6. The method of claim 1 wherein joining the substantially single crystalline silicon layer is performed by exfoliation.
7. The method of claim 6 further comprising, before forming the one or more epitaxial III-V layers:
forming an epitaxial silicon layer coupled to the substantially single crystalline silicon layer;
wherein the one or more epitaxial III-V layers are coupled to the epitaxial silicon layer.
8. The method of claim 7 wherein the epitaxial silicon layer is strained.
9. The method of claim 1 wherein:
the first adhesion layer comprises tetraethyl orthosilicate (TEOS);
the conductive layer comprises polysilicon;
the second adhesion layer comprises TEOS;
the barrier layer comprises silicon nitride; and
the bonding layer comprise silicon oxide.
10. The method of claim 9 wherein:
the first adhesion layer encapsulates the polycrystalline ceramic core;
the conductive layer encapsulates the first adhesion layer;
the second adhesion layer encapsulates the conductive layer; and
the barrier layer encapsulates the second adhesion layer.