Integrated nitride and silicon carbide-based devices
A monolithic electronic device includes a first nitride epitaxial structure including a plurality of nitride epitaxial layers. The plurality of nitride epitaxial layers include at least one common nitride epitaxial layer. A second nitride epitaxial structure is on the common nitride epitaxial layer of the first nitride epitaxial structure. A first plurality of electrical contacts is on the first epitaxial nitride structure and defines a first electronic device in the first nitride epitaxial structure. A second plurality of electrical contacts is on the first epitaxial nitride structure and defines a second electronic device in the second nitride epitaxial structure. A monolithic electronic device includes a bulk semi-insulating silicon carbide substrate having implanted source and drain regions and an implanted channel region between the source and drain regions, and a nitride epitaxial structure on the surface of the silicon carbide substrate. Corresponding methods are also disclosed.
1. A monolithic electronic device, comprising:
a common nitride epitaxial layer;
a first type of nitride device including a first epitaxial nitride structure on the common nitride epitaxial layer;
a second type of nitride device, different from the first type of nitride device, including a second epitaxial nitride structure that is different from the first epitaxial nitride structure on the common nitride epitaxial layer;
a first plurality of electrical contacts on the first epitaxial nitride structure, the first plurality of contacts defining a first electronic device of the first type of nitride device; and
a second plurality of electrical contacts on the second epitaxial nitride structure, the second plurality of contacts defining a second electronic device of the second type of electronic device;
wherein the common epitaxial layer comprises a layer of semi-insulating Al x Ga 1-x N (0<x<1).
2. The monolithic electronic device of claim 1 , wherein the first epitaxial nitride structure comprises:
a nitride channel layer;
a nitride barrier layer on the nitride channel layer, the nitride barrier layer having a higher bandgap than the nitride channel layer, wherein the nitride barrier layer and the nitride channel cooperatively induce a two-dimensional electron gas at an interface between the nitride channel layer and the nitride barrier layer.
3. The monolithic electronic device of claim 2 , further comprising a high bandgap layer on the barrier layer and a silicon nitride layer on the high bandgap layer.
4. The monolithic electronic device of claim 1 , wherein the second nitride epitaxial structure comprises a layer of Al x Ga 1-x N (0≦x≦1) having a thickness of about 300 Å to about 1000 Å.
5. The monolithic electronic device of claim 1 , wherein the first electronic device comprises a high electron mobility transistor.
6. The monolithic electronic device of claim 5 , wherein the second electronic device comprises a surface acoustic wave device.
7. The monolithic electronic device of claim 5 , wherein the second electronic device comprises a diode.
8. The monolithic electronic device of claim 5 , wherein the second electronic device comprises a field effect transistor.
9. The monolithic electronic device of claim 8 , wherein the second electronic device includes source, drain and gate contacts, and wherein the gate and drain contacts of the second electronic device are electrically coupled to form an anode.
10. The monolithic electronic device of claim 9 , wherein the second epitaxial nitride structure comprises a first layer of n-type Al x Ga 1-x N (0≦x≦1) on the first epitaxial nitride structure and a second layer of n-type Al x Ga 1-x N (0≦x≦1) on the first layer of n-type Al x Ga 1-x N (0≦x≦1), wherein the first layer of n-type Al x Ga 1-x N (0≦x≦1) has a surface charge density of about 1×10 14 cm −2 , and the second layer of n-type Al x Ga 1-x N (0≦x≦1) has a doping concentration of less than about 1×10 16 cm −3 .
11. The monolithic electronic device of claim 5 , wherein the second electronic device comprises a MISHFET.