Method of manufacturing light emitting diode and light emitting diode manufactured thereby

1. A method of manufacturing a light emitting diode, the method comprising:

growing a first conductivity type nitride semiconductor layer and an undoped nitride semiconductor layer on a substrate sequentially in a first reaction chamber;

transferring the substrate having the first conductivity type nitride semiconductor layer and the undoped nitride semiconductor layer grown thereon to a second reaction chamber;

growing an additional first conductivity type nitride semiconductor layer on the undoped nitride semiconductor layer in the second reaction chamber;

growing an active layer on the additional first conductivity type nitride semiconductor layer; and

growing a second conductivity type nitride semiconductor layer on the active layer.

2. The method of claim 1 , wherein part of the undoped nitride semiconductor layer is exposed to the air during the transferring of the substrate to the second reaction chamber.

3. The method of claim 1 , wherein the growing of the active layer and the second conductivity type nitride semiconductor layer is performed in the second reaction chamber.

4. The method of claim 1 , wherein the growing of the active layer is performed in the second reaction chamber, and

the growing of the second conductivity type nitride semiconductor layer includes:

transferring the substrate having the active layer grown thereon to a third reaction chamber; and

growing the second conductivity type nitride semiconductor layer on the active layer in the third reaction chamber.

5. The method of claim 1 , wherein the growing of the active layer includes:

transferring the substrate having the additional first conductivity type nitride semiconductor layer grown thereon to a third reaction chamber; and

growing the active layer on the additional first conductivity type nitride semiconductor layer In the third reaction chamber.

6. The method of claim 5 , wherein the growing of the second conductivity type nitride semiconductor layer includes:

transferring the substrate having the active layer grown thereon to a fourth reaction chamber; and

growing the second conductivity type nitride semiconductor layer on the active layer in the fourth reaction chamber.

7. The method of claim 1 , wherein the first conductivity type nitride semiconductor layer and the additional first conductivity type nitride semiconductor layer are formed of the same material.

8. The method of claim 1 , wherein the first conductivity type nitride semiconductor layer and the additional first conductivity type nitride semiconductor layer are formed of n-type GaN, and

the undoped nitride semiconductor layer is formed of undoped GaN.

9. The method of claim 1 , wherein the first conductivity type nitride semiconductor layer and the undoped nitride semiconductor layer are single layers, and

the undoped nitride semiconductor layer is in physical contact with the first conductivity type nitride semiconductor layer.

10. The method of claim 9 , wherein the additional first conductivity type nitride semiconductor layer is a single layer and in physical contact with the undoped nitride semiconductor layer.

11. The method of claim 10 , wherein the active layer is in physical contact with the additional first conductivity layer.

12. The method of claim 11 , wherein the second conductivity type nitride semiconductor layer is in physical contact with the active layer.

13. A method of manufacturing a light emitting diode, the method comprising:

growing a lower first conductivity type nitride semiconductor layer on a substrate in a first reaction chamber;

growing an undoped nitride semiconductor layer on the lower first conductivity type nitride semiconductor layer in the first reaction chamber to protect the lower first conductivity type nitride semiconductor layer;

transferring the substrate having the lower first conductivity type nitride semiconductor layer and the undoped nitride semiconductor layer grown thereon to a second reaction chamber; and

growing an upper first conductivity type nitride semiconductor layer on the undoped nitride semiconductor layer in the second reaction chamber.