Method for producing a light-emitting diode
View Patent ↗A method is provided for producing a light-emitting diode. A carrier substrate has a silicon surface. A series of layers is deposited on the silicon surface in a direction of growth and a light-emitting diode structure is deposited on the series of layers. The series of layers includes a GaN layer, which is formed with gallium nitride. The series of layers includes a masking layer, which is formed with silicon nitride. The masking layer follows at least part of the GaN layer in the direction of growth.
1. A method for producing a light-emitting diode, the method comprising:
providing a carrier substrate having a silicon surface;
depositing a layer sequence on the silicon surface in a growth direction; and
depositing a light-emitting diode structure onto the layer sequence;
wherein the layer sequence contains a GaN layer formed with gallium nitride;
wherein the layer sequence contains a first masking layer formed with silicon nitride;
wherein the first masking layer succeeds at least part of the GaN layer in the growth direction; and
wherein the first masking layer is deposited after depositing any GaN layer in the layer sequence and the layer sequence is free of any masking layer in between the GaN layer and the silicon surface.
2. The method according to claim 1 , wherein the first masking layer is arranged within the GaN layer.
3. The method according to claim 1 , wherein the first masking layer directly adjoins two GaN layers.
4. The method according to claim 1 , wherein at least two GaN layers are arranged before the first masking layer in the growth direction.
5. The method according to claim 1 , wherein the layer sequence contains at least two GaN layers, and each GaN layer is succeeded by an AlN layer in the growth direction.
6. The method according to claim 1 , wherein the layer sequence contains at least two GaN layers, and each GaN layer is succeeded by an AlGaN layer in the growth direction.
7. The method according to claim 1 , wherein the layer sequence contains at least two GaN layers, and each GaN layer is succeeded by an AlGaN layer and/or an AlN layer in the growth direction.
8. The method according to claim 6 , wherein a Ga concentration in at least one of the AlGaN layers is at least 5% and at most 10%.
9. The method according to claim 1 , wherein the layer sequence contains at least two GaN layers, and a masking layer is arranged within each GaN layer.
10. The method according to claim 1 , wherein the layer sequence between the silicon surface and the first masking layer in the growth direction is free of an AlGaN layer.
11. The method according to claim 1 , wherein the layer sequence is free of an AlGaN layer.
12. The method according to claim 1 , further comprising forming a buffer layer over the carrier substrate, wherein a GaN layer directly succeeds the buffer layer in the growth direction.
13. The method according to claim 12 , wherein the GaN layer that directly succeeds the buffer layer in the growth direction is a pseudomorphic GaN layer.
14. The method according to claim 13 , wherein the first masking layer in the growth direction is arranged between the pseudomorphic GaN layer and a further GaN layer, wherein the first masking layer has a thickness between 0.5 nm and 2.5 nm.
15. The method according to claim 1 , wherein the light-emitting diode structure is detached from the layer sequence.
16. The method according to claim 1 , wherein the first masking layer is grown after depositing the GaN layer.
17. The method according to claim 1 , wherein forming the layer sequence comprises:
directly depositing a nucleation layer composed of aluminum nitride onto the silicon surface, and
directly depositing a buffer layer composed of aluminum nitride onto the nucleation layer, the buffer layer deposited at a higher growth temperature than the nucleation layer; and
directly depositing a pseudomorphic GaN layer onto the buffer layer.
18. A method for producing a light-emitting diode, the method comprising:
providing a carrier substrate having a silicon surface;
depositing a layer sequence on the silicon surface in a growth direction; and
depositing a light-emitting diode structure onto the layer sequence;
wherein the layer sequence contains a GaN layer formed with gallium nitride;
wherein the layer sequence contains a first masking layer formed with silicon nitride;
wherein the first masking layer succeeds at least part of the GaN layer in the growth direction;
wherein the first masking layer is grown after depositing the GaN layer;
wherein the GaN layer directly succeeds a buffer layer in the growth direction; and
wherein the GaN layer is a pseudomorphic GaN layer.
19. The method according to claim 18 , wherein depositing the layer sequence comprises:
depositing a nucleation layer composed of aluminum nitride directly onto the silicon surface, and
depositing a buffer layer composed of aluminum nitride directly onto the nucleation layer, the buffer layer deposited at a higher growth temperature than the nucleation layer; and
depositing the pseudomorphic GaN layer directly onto the buffer layer.
20. A method for producing a light-emitting diode, the method comprising:
providing a carrier substrate having a silicon surface;
depositing a layer sequence on the silicon surface in a growth direction; and
depositing a light-emitting diode structure onto the layer sequence;
wherein the layer sequence contains a GaN layer formed with gallium nitride;
wherein the layer sequence contains a first masking layer formed with silicon nitride;
wherein the first masking layer succeeds at least part of the GaN layer in the growth direction; and
wherein forming the layer sequence comprises:
directly depositing a nucleation layer composed of aluminum nitride onto the silicon surface, and directly depositing a buffer layer composed of aluminum nitride onto the nucleation layer, the buffer layer deposited at a higher growth temperature than the nucleation layer; and
directly depositing a pseudomorphic GaN layer onto the buffer layer.