Semiconductor light-emitting device

Abstract

The invention discloses a semiconductor light-emitting device, which includes a substrate, a first conductive type semiconductor material layer, a second conductive type semiconductor material layer, a light-emitting layer, a first electrode, a second electrode, and a plurality of bump structures. The first conductive type semiconductor material layer is formed on the substrate and has an upper surface which includes a first region and a second region distinct from the first region. The first electrode is formed on the first region. The light-emitting layer and the second conductive type semiconductor material layer are formed on the second region. The bump structures are formed on the upper surface of the first conductive type semiconductor material layer and between the first region and the second region. Each bump structure is made of ITO, SiO2, SiN, ZnO, polymide, BCB, SOG, InO, or SnO.

1 . A semiconductor light-emitting device, comprising:
 a substrate;   a first conductive type semiconductor material layer, the first conductive type semiconductor material layer being formed on the substrate and having an upper surface, and the upper surface comprising a first region and a second region distinct from the first region;   a first electrode being formed on the first region;   a light-emitting layer being formed on the second region;   a second conductive type semiconductor material layer being formed on the light-emitting layer;   a second electrode being formed on the second conductive type semiconductor material layer; and   a plurality of bump structures being formed on the upper surface of the first conductive type semiconductor material layer and between the first region and the second region, wherein each of the plurality of bump structures is made of a material whose refractive index is larger than 1, and the material is one selected from the group consisting of ITO, SiO 2 , SiN, ZnO, polymide, BCB, SOG, InO, SnO, a Group III-V compound semiconductor material, and a Group II-VI compound semiconductor material.   
   
   
       2 . The semiconductor light-emitting device of  claim 1 , wherein an included angle between a part of the sidewall of each bump structure and the upper surface of the first conductive type semiconductor material layer is larger than or smaller than 90 degrees. 
   
   
       3 . The semiconductor light-emitting device of  claim 1 , wherein the height of a first top surface of the first electrode is substantially equal to or smaller than that of a second top surface of each bump structure. 
   
   
       4 . The semiconductor light-emitting device of  claim 1 , wherein the material is an insulating material. 
   
   
       5 . The semiconductor light-emitting device of  claim 1 , further comprising a transparent conductive layer, the transparent conductive layer being formed on the upper surface of the first conductive type semiconductor material layer and enwrapping the second conductive type semiconductor material layer, the light-emitting layer, and the plurality of bump structures. 
   
   
       6 . The semiconductor light-emitting device of  claim 1 , wherein at least one recess is formed on the sidewall of each bump structure or the sidewall of each bump structure has a curved contour. 
   
   
       7 . The semiconductor light-emitting device of  claim 6 , wherein the at least one recess is further formed on the top surface of each bump structure or the top surface of each bump structure further has a curved contour. 
   
   
       8 . The semiconductor light-emitting device of  claim 1 , wherein the first conductive type is N type, and the second conductive type is P type. 
   
   
       9 . The semiconductor light-emitting device of  claim 1 , wherein the substrate is formed by one selected from the group consisting of glass, silicon, GaN, GaAs, GaP, AlN, sapphire, spinel, Al 2 O 3 , SiC, ZnO, MgO, LiAlO 2 , LiGaO 2  and MgAlO 4 . 
   
   
       10 . The semiconductor light-emitting device of  claim 1 , further comprising a transparent conductive layer, the transparent conductive layer being formed on the second conductive type semiconductor material layer. 
   
   
       11 . A semiconductor light-emitting device, comprising:
 a substrate;   a first conductive type material semiconductor layer, the first conductive type semiconductor material layer being formed on the substrate and having an upper surface, and the upper surface comprising a first region and a second region distinct from the first region;   a first electrode being formed on the first region;   a light-emitting layer being formed on the second region;   a second conductive type semiconductor material layer being formed on the light-emitting layer;   a second electrode being formed on the second conductive type semiconductor material layer; and   a plurality of bump structures being formed on the upper surface of the first conductive type semiconductor material layer and between the first region and second region, wherein each of the bump structures is formed by a first structure layer and a second structure layer, the first structure layer is formed on the upper surface of the first conductive type semiconductor material layer, the second structure layer is formed on the first structure layer and is made of a material whose refractive index is larger than 1, and the material is one selected from the group consisting of ITO, SiO 2 , SiN, ZnO, polymide, BCB, SOG, InO, SnO, a Group III-V compound semiconductor material, and a Group II-VI compound semiconductor material.   
   
   
       12 . The semiconductor light-emitting device of  claim 11 , wherein the height of a first top surface of the first electrode is substantially equal to or smaller than that of a second top surface of each bump structure. 
   
   
       13 . The semiconductor light-emitting device of  claim 12 , wherein the height of a third top surface of the first structure layer is substantially equal to or smaller than that of a fourth top surface of the second conductive type semiconductor material layer. 
   
   
       14 . The semiconductor light-emitting device of  claim 11 , wherein an included angle between a part of the sidewall of each bump structure and the upper surface of the first conductive type semiconductor material layer is larger than or smaller than 90 degrees. 
   
   
       15 . The semiconductor light-emitting device of  claim 11 , further comprising a transparent conductive layer, the transparent conductive layer being formed on the upper surface of the first conductive type semiconductor material layer and enwrapping the second conductive type semiconductor material layer, the light-emitting layer, and the plurality of bump structures. 
   
   
       16 . The semiconductor light-emitting device of  claim 11 , wherein at least one recess is further formed on the sidewall of each bump structure or the sidewall of each bump structure has a curved contour. 
   
   
       17 . The semiconductor light-emitting device of  claim 16  wherein the at least one recess is further formed on the top surface of each bump structure or the top surface of each bump structure further has a curved contour. 
   
   
       18 . The semiconductor light-emitting device of  claim 11 , wherein the first conductive type is N type, and the second conductive type is P type. 
   
   
       19 . The semiconductor light-emitting device of  claim 11 , wherein the substrate is formed by one selected from the group consisting of glass, silicon, GaN, GaAs, GaP, AlN, sapphire, spinel, Al 2 O 3 , SiC, ZnO, MgO, LiAlO 2 , LiGaO 2  and MgAlO 4 . 
   
   
       20 . The semiconductor light-emitting device of  claim 11 , further comprising a transparent conductive layer, the transparent conductive layer being formed on the second conductive type semiconductor material layer. 
   
   
       21 . A semiconductor light-emitting device, comprising:
 a substrate having a first upper surface;   a plurality of bump structures being formed on the first upper surface of the substrate, wherein each of the plurality of bump structures is made of a material whose refractive index is larger than 1;   a first conductive type semiconductor material layer, the first conductive type semiconductor material layer covering the first upper surface of the substrate, so as to make the plurality of bump structures to expose out of the first conductive type semiconductor material layer, wherein the first conductive type semiconductor material layer has a second upper surface, and the second upper surface comprises a first region and a second region distinct from the first region;   a light-emitting layer being formed on the second region;   a first electrode being formed on the first region, so that the plurality of bump structures are between the light-emitting layer and the first electrode;   a second conductive type semiconductor material layer being formed on the light-emitting layer; and   a second electrode being formed on the second conductive type semiconductor material layer.   
   
   
       22 . The semiconductor light-emitting device of  claim 21 , wherein the material is one selected from the group consisting of ITO, SiO 2 , SiN, ZnO, polymide, BCB, SOG, InO, SnO, a Group III-V compound semiconductor material, and a Group II-VI compound semiconductor material. 
   
   
       23 . The semiconductor light-emitting device of  claim 21 , further comprising a transparent conductive layer, the transparent conductive layer being formed on the second conductive type semiconductor material layer.