Light emitting device having vertical structrue and method for manufacturing the same
View Patent ↗A light emitting device having a vertical structure and a method for manufacturing the same, which are capable of damping impact generated during a substrate separation process and achieving an improvement in mass productivity, are disclosed. The light emitting device includes a semiconductor layer having a multilayer structure, a first electrode arranged at one surface of the semiconductor layer, a metal support arranged on the first electrode, and an impact damping layer arranged between the first electrode and the metal support, and made of a metal having a ductility higher than a ductility of a metal for the metal support.
1. A light emitting device having a vertical structure, comprising:
a conductive support structure comprising a support layer;
a bonding layer on the conductive support structure;
a first electrode on the bonding layer, the first electrode comprising a reflective electrode;
a metal layer arranged between the first electrode and the bonding layer, wherein the ductility of the metal layer is higher than the ductility of the support layer, and wherein a width of the metal layer is greater than a width of the first electrode;
a semiconductor structure having multi-layers on the first electrode, the semiconductor structure having an inclined side surface, wherein the semiconductor structure comprises a first-type semiconductor layer on the first electrode, an active layer on the first-type semiconductor layer, and a second-type semiconductor layer on the active layer;
a passivation layer on the semiconductor structure, wherein the passivation layer contacts the metal layer; and
a second electrode on the semiconductor structure.
2. The light emitting device according to claim 1 , wherein the bonding layer is configured to enhance an adhesion between the conductive support structure and the metal layer.
3. The light emitting device according to claim 1 , wherein the surface area of the first electrode facing the semiconductor structure is smaller than the surface area of the conductive support structure facing the bonding layer.
4. The light emitting device according to claim 1 , wherein the surface area of the semiconductor structure facing the first electrode is smaller than the surface area of the conductive support structure facing the bonding layer.
5. The light emitting device according to claim 1 , wherein the metal layer includes at least one of In, Sn, Ag, Au, Pt and Al .
6. The light emitting device according to claim 1 , wherein the metal layer has a thickness of 1 to 10 μm.
7. The light emitting device according to claim 1 , wherein the semiconductor structure comprises a GaN-based semiconductor layer.
8. The light emitting device according to claim 1 , wherein the support layer includes at least one of Cu, Ni and Au.
9. The light emitting device according to claim 1 , wherein the conductive support structure has a thickness of 30 to 200 μm.
10. The light emitting device according to claim 1 , wherein the reflective electrode comprises at least one of Ag and Al.
11. The light emitting device according to claim 1 , wherein the bonding layer comprises at least one of Ti, Pt, Au, Ni and Al.
12. The light emitting device according to claim 1 , wherein the first electrode and the metal layer have surfaces facing each other, and wherein the areas of the surfaces are substantially the same.
13. The light emitting device according to claim 1 , wherein the first electrode contacts the metal layer.
14. The light emitting device according to claim 1 , wherein the metal layer contacts the bonding layer.
15. The light emitting device according to claim 1 , wherein the passivation layer is on the side surface of the semiconductor structure.
16. The light emitting device according to claim 1 , wherein the passivation layer contacts the bonding layer.
17. The light emitting device according to claim 1 , wherein the first-type is p-type and the second-type is n-type.
18. The light-emitting device according to claim 1 , wherein the passivation layer contacts an edge portion of the metal layer.
19. The light emitting device according to claim 1 , wherein the metal layer is configured to absorb impact that occurs during manufacturing process.
20. The light emitting device according to claim 1 , wherein the first electrode comprises an ohmic electrode.
21. The light emitting device according to claim 20 , wherein the ohmic electrode comprises transparent material.
22. The light emitting device according to claim 20 , wherein the ohmic electrode comprises at least one of Ru, Ni, Au and ITO.
23. The light emitting device according to claim 20 , wherein the ohmic electrode contacts the semiconductor structure.
24. The light emitting device according to claim 1 , wherein the inclination of the the inclined side surface is a substantially fixed inclination.