Diode having vertical structure and method of manufacturing the same

1. A vertical light emitting device, comprising:

a GaN layer having a multilayer structure including an n-type layer, an active layer, and a p-type layer, the GaN layer having a first surface and a second surface;

a conductive structure on the first surface of the GaN layer, wherein the conductive structure comprises a first electrode, wherein the first electrode is in contact with the first surface of the GaN layer, wherein the first electrode and the second surface of the GaN layer are configured such that the first electrode reflects light from the active layer back through the second surface of the GaN layer; and

a second electrode in contact with the second surface of the GaN layer,

wherein the conductive structure is located at the bottom of the light emitting device.

2. The vertical light emitting device according to claim 1 , wherein the first electrode includes at least one material selected from a group including Al, Ti/Al, Cr/Au, and Ti/Au.

3. The vertical light emitting device according to claim 1 , further comprising a transparent contact on the GaN layer.

4. The vertical light emitting device according to claim 3 , the transparent contact includes a transparent conductive oxide (TCO).

5. The vertical light emitting device according to claim 3 , wherein the transparent contact includes indium-tin-oxide.

6. The vertical light emitting device according to claim 1 , wherein the second electrode includes at least one material selected from a group including Ni/Au, Pd/Au, Pd/Ni and Pt.

7. The vertical light emitting device according to claim 1 , wherein the active layer includes AlInGaN.

8. The vertical light emitting device according to claim 1 , wherein the active layer includes at least one of a quantum well layer and a double hetero structure.

9. The vertical light emitting device according to claim 8 , wherein the quantum well layer includes a multiple quantum well layer.

10. The vertical light emitting device according to claim 1 , wherein the conductive structure has substantially the same surface area as the first surface of the GaN layer.

11. A vertical light emitting device, comprising:

a first GaN layer of a first conductivity;

an active layer on the first GaN layer;

a second GaN layer of a second conductivity on the active layer;

a first electrode directly on the first GaN layer, wherein the first electrode reflects light from the active layer;

a second electrode contacting a surface of the second GaN layer; and

a pad over the second electrode,

wherein the first electrode is configured to reflect light from the active layer back through the surface of the second GaN layer.

12. The vertical light emitting device according to claim 11 , wherein the first electrode includes at least one material selected from a group including Al, Ti/Al, Cr/Au, and Ti/Au.

13. The vertical light emitting device according to claim 11 , wherein the first electrode includes Al having a concentration of about 99.999% or higher.

14. The vertical light emitting device according to claim 11 , wherein the first electrode includes Al of about 3000 Å.

15. The vertical light emitting device according to claim 11 , further comprising a transparent contact on the second GaN layer.

16. The vertical light emitting device according to claim 15 , the transparent contact includes a transparent conductive oxide (TCO).

17. The vertical light emitting device according to claim 15 , wherein the transparent contact includes indium-tin-oxide.

18. The vertical light emitting device according to claim 11 , wherein the second electrode includes at least one material selected from a group including Ni/Au, Pd/Au, Pd/Ni and Pt.

19. The vertical light emitting device according to claim 11 , wherein the active layer includes AlInGaN.

20. The vertical light emitting device according to claim 11 , wherein the active layer includes includes at least one of a quantum well layer and a double hetero structure.

21. The vertical light emitting device according to claim 20 , wherein the quantum well layer includes a multiple quantum well layer.

22. The vertical light emitting device according to claim 11 , further comprising a cladding layer between the first GaN layer and the active layer or between the second GaN layer and the active layer.

23. The vertical light emitting device according to claim 22 , wherein the cladding layer includes at least one material selected from a group including n-AlGaN and p-AlGaN.

24. The vertical light emitting device according to claim 11 , wherein the first electrode has substantially the same surface area as a surface of the first GaN layer.

25. The vertical light emitting device according to claim 11 , wherein the first conductivity is n-type and the second conductivity is p-type.

26. The vertical light emitting device according to claim 11 , wherein the first GaN layer comprises a buffer layer.

27. A diode, comprising:

a conductive structure;

an n-GaN layer on the conductive structure;

an active layer on the n-GaN layer;

a p-GaN layer on the active layer; and

a p-electrode contacting a surface of the p-GaN layer;

wherein the conductive structure comprises an n-electrode, wherein the n-electrode is configured to reflect light from the active layer back through the surface of the p-GaN layer, and wherein the conductive structure is located at the bottom of the diode.

28. The vertical light emitting device according to claim 11 , wherein the first conductivity is p-type and the second conductivity is n-type.