Semiconductor light-emitting device
The present disclosure relates to a semiconductor light-emitting device, which includes: a plurality of semiconductor layers composed of a first semiconductor layer, a second semiconductor layer, and an active layer; a first electrode disposed on the second semiconductor layer; a high-resistance body interposed between the second semiconductor layer and the first electrode; and a light-transmitting conductive film having an opening through which the high-resistance body is exposed, the first electrode being brought into contact with the light-transmitting conductive film, which is disposed on the high-resistance body, and the high-resistance body, which is exposed through the opening.
1. A semiconductor light-emitting device, comprising:
a plurality of semiconductor layers composed of a first semiconductor layer having first conductivity, a second semiconductor layer having second conductivity different than the first conductivity, and an active layer disposed between the first semiconductor layer and the second semiconductor layer and generating light by recombination of electrons and holes;
a high-resistance body made of an insulating material on the second semiconductor layer;
a light-transmitting conductive film covering the second semiconductor layer and the high-resistance body; and
a first electrode disposed on the light-transmitting conductive film;
wherein the light-transmitting conductive film electrically connects the second semiconductor layer to the first electrode and has an opening through which the high-resistance body is exposed, and,
wherein the first electrode is brought into contact with the light-transmitting conductive film which is disposed on the high-resistance body, and with the high-resistance body which is exposed through the opening.
2. The semiconductor light-emitting device as claimed in claim 1 , wherein the light-transmitting conductive film has a greater refractive index than the high-resistance body.
3. The semiconductor light-emitting device as claimed in claim 2 , wherein the high-resistance body comprises at least one of SiO 2 , TiO 2 , AlO x , and NiO x .
4. The semiconductor light-emitting device as claimed in claim 1 , wherein the first electrode comprises:
a first pad electrode disposed on the high-resistance body; and
a first branch electrode disposed on the high-resistance body and electrically connected to the first pad electrode.
5. The semiconductor light-emitting device as claimed in claim 4 , wherein the light-transmitting conductive film is provided with a plurality of openings which are arranged along the first branch electrode to expose the high-resistance body, and the first branch electrode is alternately brought into contact with the light-transmitting conductive film, which is disposed on the high-resistance body, and the high-resistance body, which is exposed through the openings.
6. The semiconductor light-emitting device as claimed in claim 5 , wherein the width of the high-resistance body is larger than that of the first branch electrode, and the width of the opening is equal to or larger than that of the first branch electrode.
7. The semiconductor light-emitting device as claimed in claim 6 , wherein the width of the opening is larger than 5 μm and smaller than 40 μm.
8. The semiconductor light-emitting device as claimed in claim 4 , wherein the opening is formed on the light-transmitting conductive film disposed under the first pad electrode, and the first pad electrode is brought into contact with the high-resistance body exposed through the opening.
9. The semiconductor light-emitting device as claimed in claim 4 , further comprising a second electrode disposed on the first semiconductor layer exposed by mesa-etching,
wherein the second electrode comprises a second pad electrode disposed on the exposed first semiconductor layer and a second branch electrode extending on the exposed first semiconductor layer and electrically connected to the second pad electrode.
10. The semiconductor light-emitting device as claimed in claim 9 , wherein the semiconductor light-emitting device is formed in a rectangular shape with long sides and short sides, the first pad electrode and the second pad electrode are positioned on the opposite short sides, respectively, the second branch electrode extends in a long-side direction, and the first branch electrode extends to both sides of the second branch electrode, and
wherein the light-transmitting conductive film is provided with a plurality of first openings, which are arranged along the first branch electrode to expose the high-resistance body, and a second opening, which corresponds to the first pad electrode, the first branch electrode is alternately brought into contact with the light-transmitting conductive film, which is disposed on the high-resistance body, and the high-resistance body, which is exposed through the first openings, and the first pad electrode is brought into contact with the high-resistance body exposed through the second opening.
11. The semiconductor light-emitting device as claimed in claim 1 , wherein the light-transmitting conductive film has a greater refractive index than the high-resistance body, and the high-resistance body comprises at least one of SiO 2 , TiO 2 , AlO x , and NiO x , and
wherein the first electrode comprises a first pad electrode disposed on the high-resistance body and a first branch electrode disposed on the high-resistance body and electrically connected to the first pad electrode.
12. The semiconductor light-emitting device as claimed in claim 11 , wherein the light-transmitting conductive film is provided with a plurality of openings which are arranged along the first branch electrode to expose the high-resistance body, and the first branch electrode is alternately brought into contact with the light-transmitting conductive film, which is disposed on the high-resistance body, and the high-resistance body, which is exposed through the openings.
13. The semiconductor light-emitting device as claimed in claim 12 , wherein the width of the high-resistance body is larger than that of the first branch electrode, and the width of the opening is equal to or larger than that of the first branch electrode.
14. The semiconductor light-emitting device as claimed in claim 13 , wherein the width of the opening is larger than 5 μm and smaller than 40 μm.
15. The semiconductor light-emitting device as claimed in claim 11 , wherein the opening is formed on the light-transmitting conductive film disposed under the first pad electrode, and the first pad electrode is brought into contact with the high-resistance body exposed through the opening.
16. The semiconductor light-emitting device as claimed in claim 11 , further comprising a second electrode disposed on the first semiconductor layer exposed by mesa-etching,
wherein the second electrode comprises a second pad electrode disposed on the exposed first semiconductor layer and a second branch electrode extending on the exposed first semiconductor layer and electrically connected to the second pad electrode.
17. The semiconductor light-emitting device as claimed in claim 16 , wherein the semiconductor light-emitting device is formed in a rectangular shape with long sides and short sides, the first pad electrode and the second pad electrode are positioned on the opposite short sides, respectively, the second branch electrode extends in a long-side direction, and the first branch electrode extends to both sides of the second branch electrode, and
wherein the light-transmitting conductive film is provided with a plurality of first openings, which are arranged along the first branch electrode to expose the high-resistance body, and a second opening, which corresponds to the first pad electrode, the first branch electrode is alternately brought into contact with the light-transmitting conductive film, which is disposed on the high-resistance body, and the high-resistance body, which is exposed through the first openings, and the first pad electrode is brought into contact with the high-resistance body exposed through the second opening.