Method for forming semiconductor

1. A method for forming a semiconductor device, comprising:

forming a plurality of semiconductor material layers on a doped substrate;

removing a part of the plurality of semiconductor material layers to form an exposed doped substrate;

ion implanting a dopant into the exposed doped substrate to form a doped semiconductor structure, wherein

the doped substrate and the doped semiconductor structure have different polarities; and

forming, on the doped semiconductor structure, an insulation layer covering the plurality of semiconductor material layers;

forming an ohmic contact on the doped semiconductor structure; and

forming a first conductive through hole on the ohmic contact.

2. The method according to claim 1 , wherein the doped substrate is a doped silicon substrate.

3. The method according to claim 1 , wherein the doped substrate comprises a p-type semiconductor material and the doped semiconductor structure comprises an n-type semiconductor material.

4. The method according to claim 3 , further comprising:

ion implanting the n-type semiconductor material with a first doping concentration into the exposed doped substrate to form a first doped semiconductor structure of the doped semiconductor structure.

5. The method according to claim 4 , wherein the n-type semiconductor material with the first doping concentration is ion implanted obliquely into the exposed doped substrate.

6. The method according to claim 5 , wherein the n-type semiconductor material with the first doping concentration is ion implanted obliquely into the exposed doped substrate at multiple angles.

7. The method according to claim 4 , wherein the first doped semiconductor structure has a doping concentration of about 10 14 cm −3 to about 10 17 cm −3 .

8. The method according to claim 4 , further comprising:

ion implanting the n-type semiconductor material with a second doping concentration into the exposed doped substrate to form a second doped semiconductor structure of the doped semiconductor structure.

9. The method according to claim 8 , wherein the n-type semiconductor material with the second doping concentration is ion implanted vertically into the exposed doped substrate.

10. The method according to claim 8 , wherein the second doped semiconductor structure has a doping concentration of about 10 17 cm −3 to about 10 21 cm −3 .

11. The method according to claim 8 , wherein the second doped semiconductor structure has a higher doping concentration than the first doped semiconductor structure.

12. The method according to claim 8 , wherein the second doped semiconductor structure is formed after the first doped semiconductor structure, and the first doped semiconductor structure is located between the doped substrate and the second doped semiconductor structure.

13. The method according to claim 3 , wherein the doped semiconductor structure comprises at least one of phosphorus (P) and arsenic (As).

14. The method according to claim 3 , wherein the doped substrate comprises at least one of boron (B) and gallium (Ga).

15. The method according to claim 1 , further comprising:

forming a high-electron-mobility transistor (HEMT) by using the plurality of semiconductor material layers, the plurality of semiconductor material layers comprising a buffer layer, a channel layer, and a barrier layer used for the HEMT;

forming a gate on the barrier layer; and

forming a conductor layer below the doped substrate.

16. The method according to claim 15 , further comprising:

forming, on the HEMT, a second conductive through hole connected to a source of the HEMT, wherein

the source is connected to the doped substrate through the second conductive through hole and the conductor layer.

17. The method according to claim 16 , further comprising:

forming, on the HEMT, a third conductive through hole connected to a drain of the HEMT, wherein

the drain is connected to the doped semiconductor structure through the first conductive through hole and the third conductive through hole.

18. The method according to claim 15 , further comprising:

forming, on the HEMT, a second conductive through hole connected to a source of the HEMT, wherein

the source is connected to the doped substrate through the second conductive through hole and the conductor layer.

19. The method according to claim 16 , further comprising:

forming, on the HEMT, a third conductive through hole connected to the gate, wherein

the gate is connected to the doped semiconductor structure through the first conductive through hole and the third conductive through hole.