WO2006004042A9 - 半導体発光素子及びその製造方法 - Google Patents
半導体発光素子及びその製造方法Info
- Publication number
- WO2006004042A9 WO2006004042A9 PCT/JP2005/012210 JP2005012210W WO2006004042A9 WO 2006004042 A9 WO2006004042 A9 WO 2006004042A9 JP 2005012210 W JP2005012210 W JP 2005012210W WO 2006004042 A9 WO2006004042 A9 WO 2006004042A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- semiconductor
- light
- layer
- main surface
- semiconductor region
- Prior art date
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 209
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000000758 substrate Substances 0.000 claims abstract description 86
- 229910001316 Ag alloy Inorganic materials 0.000 claims abstract description 25
- 229910052709 silver Inorganic materials 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 11
- 239000000654 additive Substances 0.000 claims description 10
- 230000000996 additive effect Effects 0.000 claims description 10
- 150000004767 nitrides Chemical class 0.000 claims description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 7
- 239000004332 silver Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 229910052738 indium Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 229910052779 Neodymium Inorganic materials 0.000 claims description 3
- 229910052741 iridium Inorganic materials 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 238000001947 vapour-phase growth Methods 0.000 claims description 3
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 2
- 238000002310 reflectometry Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 201
- 239000000956 alloy Substances 0.000 description 13
- 229910045601 alloy Inorganic materials 0.000 description 12
- 230000000694 effects Effects 0.000 description 12
- 239000012535 impurity Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 239000010703 silicon Substances 0.000 description 10
- 238000000605 extraction Methods 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 239000010949 copper Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000005253 cladding Methods 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 238000005486 sulfidation Methods 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 238000005987 sulfurization reaction Methods 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 238000001579 optical reflectometry Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/36—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the electrodes
- H01L33/40—Materials therefor
- H01L33/405—Reflective materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/005—Processes
- H01L33/0093—Wafer bonding; Removal of the growth substrate
Definitions
- the present invention relates to a semiconductor light emitting device for use in a display, a lamp, or the like, and a method of manufacturing the same.
- a semiconductor region having a light emitting function of a semiconductor light emitting device includes an n-type semiconductor layer generally called an n-type cladding layer, an active layer, and a p-type semiconductor layer generally called a p-type cladding layer. have.
- one side of the main surfaces of a pair of semiconductor regions having a light emitting function is a light extraction surface.
- light is emitted from the active layer not only to one main surface side of the semiconductor region having a light emitting function but also to the other main surface side. Therefore, in order to increase the light extraction efficiency of the semiconductor light emitting device, it is important to reflect the light emitted from the active layer to the other main surface side to the one main surface side.
- the semiconductor light emitting device having the light reflecting layer provided on the bottom surface of the substrate has a problem that it is difficult to greatly improve the light extraction efficiency due to light absorption in the substrate, and the semiconductor region having the light emitting function and the substrate. There is a problem that the electrical resistance during the period becomes relatively high.
- the semiconductor fluorescent device having the latter problem when the substrate is used as a current path of the semiconductor light emitting device and a cathode electrode is provided on the substrate, for example, the forward voltage between the anode electrode and the force sword electrode is large. Become.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-217450 (hereinafter referred to as Patent Document 1) that a light reflecting layer is provided between a main semiconductor region having a light emitting function and a substrate. ). That is, in Patent Document 1, an AuGeGa alloy layer is dispersedly formed on the lower surface side of a main semiconductor region having a light emitting function, and the AuGeGa alloy layer and the main semiconductor region having a light emitting function not covered by the AuGeGa alloy layer are disclosed. Cover both the bottom and the bottom with a metal reflective film such as A1, and further, for example, a conductive support made of conductive silicon. It is disclosed to attach a holding substrate.
- a metal reflective film such as A1
- a conductive support made of conductive silicon it is disclosed to attach a holding substrate.
- the AuGeGa alloy layer has a relatively good ohmic contact with a Group 3-5 compound semiconductor such as AlGalnP. Therefore, according to this structure, the forward voltage between the anode electrode and the force sword electrode can be reduced. In addition, since light emitted from the main semiconductor region having a light emitting function to the conductive support substrate side can be reflected by the metal reflecting film, high light emission efficiency can be obtained.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-217450
- an object of the present invention is to provide a semiconductor light emitting device with high luminous efficiency.
- the present invention for solving the above problems includes a support substrate, a light reflection layer made of silver or a silver alloy disposed on one main surface of the support substrate, and a plurality of semiconductor layers necessary for light emission. And a semiconductor region having one main surface electrically connected to the light reflecting layer and the other main surface for extracting light, and the other main surface of the semiconductor region And an electrode connected to a surface.
- the support substrate mechanically supports the semiconductor region, and is a conductive material. Alternatively, it is made of an insulating material.
- the conductive material examples include Si (silicon), GaAs (gallium) containing a metal such as Cu ( ⁇ ), Ag (silver), A1 (aluminum), Ni (nickel), Pt (platinum), or a conductivity-determining impurity.
- a semiconductor such as arsenic
- As the insulating material stone glass, soda glass, sapphire and the like can be used.
- the semiconductor region means a main semiconductor region having a light emitting function including at least an n- type semiconductor layer and a p-type semiconductor layer, and preferably further includes an active layer.
- the light reflecting layer is made of Ag and at least one selected from Cu, Au, Pd, Nd, Si, Ir, Ni, W, Zn, Ga, Ti, Mg, Y, In, and Sn. It is desirable to consist of alloys with elements.
- the ratio of the additive element to the Ag is preferably 0,5 to 10% by weight.
- the light reflection layer preferably has a thickness of 50 to 1500 nm.
- the electrode is a light non-transmissive electrode or an electrode having a light non-transmissive portion, and the light non-transmissive electrode or the light non-transmissive portion is disposed on a part of the other main surface of the semiconductor region. It is desirable that a current blocking layer be disposed between the light non-transmissive electrode or the light non-transmissive portion and the support substrate.
- the semiconductor light emitting device according to the present invention is a liquid crystal display
- a light reflecting layer made of silver or a silver alloy on at least one of one main surface of the semiconductor region and one main surface of the support substrate;
- the method further comprises a step of removing the growth substrate before or after the attaching step and a step of forming an electrode on the other main surface of the semiconductor region.
- a light reflecting layer having a high reflectivity and a small electrical resistance to the semiconductor region as compared with the conventional light reflecting layer having the A1 force shown in Patent Document 1 is provided. Can be provided.
- FIG. 1 is a cross-sectional view showing a semiconductor light emitting device according to Example 1 of the present invention.
- FIG. 2 is a cross-sectional view showing a semiconductor substrate and a semiconductor region at the manufacturing stage of the semiconductor light emitting device of FIG.
- FIG. 3 is a cross-sectional view showing the main surface of the semiconductor region of FIG. 2 provided with a first bonding layer.
- FIG. 4 is a cross-sectional view showing a supporting substrate with a second bonding layer.
- FIG. 5 is a cross-sectional view showing a semiconductor substrate attached to a support substrate.
- FIG. 6 is a cross-sectional view showing a support substrate and a semiconductor region after the semiconductor substrate is removed from FIG.
- FIG. 7 is a graph showing the relationship between the wavelength and the reflectance of the light reflecting layer of the example of the present invention and the conventional example.
- FIG. 8 is a cross-sectional view showing a semiconductor light emitting device of a second embodiment.
- FIG. 9 is a cross-sectional view showing a semiconductor light emitting device of a third embodiment.
- FIG. 10 is a cross-sectional view showing a semiconductor light emitting element of a fourth embodiment.
- FIG. 11 is a cross-sectional view showing a semiconductor light emitting device of a fifth embodiment.
- a light-emitting diode as a semiconductor light-emitting device according to Example 1 of the present invention shown in FIG. 1 includes a conductive support substrate 1, a light reflection layer 2, and a semiconductor region 3 having a light-emitting function.
- the first electrode 4 and the second electrode 5 are included.
- the semiconductor region 3 is generally called an n-type cladding layer 6, an active layer 7, and generally called a p-type cladding layer in order to form a light-emitting diode having a double heterojunction structure.
- a p-type semiconductor layer 8 and a p-type auxiliary semiconductor layer 9 are provided. Each layer 6-9 of the semiconductor region 3 is formed so that the light emitted from the active layer 7 can be transmitted. Details of the semiconductor region 3 will be described later.
- the support substrate 1 is made of a conductive silicon semiconductor having one main surface 10 and the other main surface 11, and has an n-type impurity concentration of 5 ⁇ 10 18 cm to 5 ⁇ 10 I9 cm _3. And a resistivity of 0.0001-0.01 1 ⁇ ′ cm, and functions as a current path between the first and second electrodes 4, 5.
- the support substrate 1 has a thickness capable of mechanically supporting the light reflecting layer 2, the semiconductor region 3, and the first and second electrodes 4, 5, preferably 300 to 1000 111.
- the impurity of the substrate 1 can be a p-type impurity.
- the light reflecting layer 2 disposed between one main surface 10 of the support substrate 1 and one main surface 12 of the semiconductor region 3 is generated in the semiconductor region 3, for example 400nn! It has a reflectance of 90% or more with respect to light having a wavelength of ⁇ 600 mn, and is in ohmic contact with both one main surface 10 of the support substrate 1 and one main surface 12 of the semiconductor region 3. Since the light reflecting layer 2 is in good ohmic contact with the support substrate 1 and the semiconductor region 3 and has good light reflectivity, it is not necessary to disperse and provide the light reflecting layer 2 as shown in Patent Document 1. In other words, one main surface 10 of the support substrate 1 and one main surface 12 of the semiconductor region 3 are substantially in contact with each other. It is desirable to form the light reflecting layer 2 on the entire one main surface 12 of the semiconductor region 3. However, the light reflecting layer 2 can also be formed in the range of 50% to 100%, more preferably 90% to 100% of the one main surface 12 of the semiconductor region 3.
- the light reflecting layer 2 is made of Ag (silver) or silver to satisfy both the light reflecting property and the ohmic property.
- the Ag alloy is N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoe
- Additive element 0.5 to 10% by weight
- the additive element is also called an alloy element, and is preferably Cu (copper), Au (gold), Pd (palladium), Nd (neodymium), Si (silicon), Ir (iridium), Ni (nickel) ), W (tungsten), Zn (zinc), Ga (gallium), Ti (titanium), Mg (magnesium), Y (yttrium), In (indium), and Sn (tin) or It is desirable to have multiple forces.
- the additive element is a function of suppressing oxidation of the light reflecting layer 2 made of Ag or an Ag alloy, a function of suppressing sulfidation of the light reflecting layer 2, and alloying between the light reflecting layer 2 and the semiconductor region 3.
- Have at least one of the functions to suppress Cu and Au are particularly advantageous for suppressing the acid reflection in the light reflecting layer 2.
- Zn and Sn are particularly advantageous. If oxidation or sulfuration of the light reflecting layer 2 due to Ag or Ag alloy force occurs, ohmic contact between the light reflecting layer 2 and the semiconductor region 3 and the substrate 1 is deteriorated, and the reflectance is lowered.
- the reflectance of the light reflecting layer 2 is lowered.
- the light reflecting layer 2 in FIG. 1 is used for attaching the semiconductor region 3 to the support substrate 1 so that the force will be clarified later. If oxidation or sulfuration occurs in the light reflecting layer 2 made of Ag or an Ag alloy, a good adhesion between the support substrate 1 and the semiconductor region 3 through the light reflecting layer 2 is achieved. Can't be achieved.
- the ratio of the additive element to Ag is 0.5 to 10% by weight.
- the ratio of the additive element is less than 0.5% by weight, it becomes difficult to obtain the desired effect of suppressing oxidization or sulfidation, and when it exceeds 10% by weight, it is difficult to obtain the desired reflectance. It becomes difficult.
- a more desirable ratio of the additive element is 1.5 to 5% by weight.
- the light reflecting layer 2 has a thickness of 50 nm or more in order to prevent light from being transmitted here. Further, in order to obtain a good function of attaching the semiconductor region 3 to the support substrate 1, it is desirable that the thickness of the light reflecting layer 2 is 80 nm or more. However, if the thickness of the light reflecting layer 2 exceeds 1500 nm, cracks occur in the Ag layer or the Ag alloy layer constituting the light reflecting layer 2. Accordingly, the preferred thickness of the light reflecting layer 2 is 50 to 1500 nm, and the more preferred thickness is 80 to 10 OOnm.
- the n-type semiconductor layer 6 in the semiconductor region 3 constituting the light emitting diode having a double heterojunction structure is, for example,
- the nitride semiconductor represented by ⁇ ⁇ ⁇ ⁇ ⁇ is doped with ⁇ -type impurities, and more preferably n-type GaN.
- the active layer 7 on the n-type semiconductor layer 6 is, for example,
- the active layer 7 is schematically shown as a single layer. Actually, it has a well-known multiple quantum well structure. Of course, the active layer 7 can also be composed of one layer. Alternatively, the active layer 7 may be omitted and the n-type semiconductor layer 6 may be in direct contact with the p-type semiconductor layer 8. Further, in this embodiment, the active layer 7 is not doped with the conductivity determining impurity force S, but may be doped with p-type or n-type impurities.
- the p-type semiconductor layer 8 disposed on the active layer 7 is, for example,
- the nitride semiconductor indicated by P be doped with P-type impurities. More desirable, type GaN.
- the p-type trapping semiconductor layer 9 disposed on the p-type semiconductor layer 8 has a current spreading function and an ohmic contact function.
- the same nitride semiconductor as the p-type semiconductor layer 8 is used.
- the material consists of GaN force doped with p-type impurities at a higher concentration than the P- type semiconductor layer 8.
- the p-type auxiliary semiconductor layer 9 can be formed in a multilayer structure having a laminate strength of a plurality of first and second layers. The first layer in this multilayer structure is
- M is at least one element selected from In (indium) and B (boron), and X and y are 0 ⁇ ⁇ 1,
- M is at least one element selected from In (indium) and B (boron),
- a and b are 0 a ⁇ l
- the first layer preferably has a thickness of 5 to 10 mn
- the second layer of the multilayer buffer region preferably has a thickness of 1 to 100 nm.
- the first electrode 4 can be directly connected to the p-type semiconductor layer 8 by omitting the auxiliary semiconductor layer 9. .
- the first electrode 4 as the anode electrode is disposed on the main surface of the p-type auxiliary semiconductor layer 9, that is, the central portion of the other main surface 13 of the semiconductor region 3, and is electrically connected thereto. Yes.
- the first electrode 4 has a function as a bonding pad portion for bonding a connection member such as a wire (not shown), and is formed so as not to transmit light.
- the second electrode 5 as a force sword electrode is disposed on the other main surface 11 of the support substrate 1, that is, the entire lower surface, and is electrically connected thereto.
- a well-known light-transmitting electrode can be disposed on the surface of the auxiliary semiconductor region 9, and the first electrode 4 can be disposed thereon.
- the growth substrate 20 may be any material as long as the semiconductor region 3 can be vapor-phase grown on the growth substrate 20, for example, a 3-5 group semiconductor such as 03, silicon, or sapphire, etc. Selected.
- the growth substrate 20 is made of silicon for cost reduction.
- the p-type auxiliary semiconductor layer 9, the p-type semiconductor layer 8, the active layer 7, and the n-type semiconductor layer 6 shown in FIG. thus, a semiconductor region 3 having a light emitting function is obtained.
- the p-type trapping semiconductor layer 9 functions as a buffer layer for the p-type semiconductor layer 8, the active layer 7, and the n-type semiconductor layer 6.
- a first bonding layer 2 a made of Ag or an Ag alloy is formed on one main surface 12 of the semiconductor region 3 by a known sputtering method.
- the first bonding layer 2a can be formed by another vapor deposition method other than the sputtering method.
- the thickness of the first bonding layer 2a is expected to be about half that of the completed light reflecting layer 2 shown in FIG. Good.
- the second bonding layer 2b is formed on this one main surface 10 with a well-known sputtering method with the Ag or Ag alloy force.
- the first bonding layer on one main surface 12 of the semiconductor region 3 shown in FIG. 3 with respect to the second bonding layer 2b on the support substrate 1 1a and 2b are laminated by applying heat treatment of, for example, 210 ° C to 400 ° C by diffusing 2a, and mutually diffusing the Ag or Ag alloy material.
- a light reflecting layer 2 is obtained.
- This type of bonding is generally called diffusion bonding or thermocompression bonding.
- the first and second bonding layers 2a and 2b are Ag, it is desirable to bond them after etching the surface to remove the oxidized or sulfurized film.
- the light reflecting layer 2 is in good ohmic contact with the support substrate 1 and the semiconductor region 3 and has a relatively large reflectance.
- the growth substrate 20 is removed by cutting or etching to obtain a semiconductor substrate shown in FIG. It is also possible to remove the growth substrate 20 in the state before the attaching step in FIG. 3 and attach only the semiconductor region 3 to the support substrate 1 via the first and second attaching layers 2a and 2b.
- the first and second electrodes 4 and 5 shown in FIG. 1 are formed to complete the semiconductor light emitting device.
- the semiconductor substrate shown in FIG. 6 is formed to have a relatively large surface area, and a plurality of first electrodes 4 for a plurality of semiconductor light-emitting elements are formed, and then the semiconductor The substrate is divided to obtain a plurality of individual semiconductor light emitting elements.
- Characteristic lines A, B, C, D, and E in FIG. 7 indicate the reflectance when the light reflecting layer 2 is formed of an Ag alloy, Ag, Al, Al alloy, and a laminate of NiAu and Al.
- the reflectance of Ag alloy indicated by characteristic line A and the reflectance of Ag indicated by characteristic line B are 90% or more at wavelengths of 40Q to 600 nm.
- A1 indicated by conventional characteristic line C The reflectance of A1 alloy indicated by characteristic line D is greater than the reflectance of the NiAu and A1 laminate indicated by characteristic line E. Therefore, the light extraction efficiency of the semiconductor light emitting device can be increased.
- the contact alloy layer is dispersed between the light reflecting layer and the semiconductor region, whereas in this embodiment, the light reflecting layer 2 is made of the semiconductor region 3 and silicon. It is in good ohmic contact with the supporting substrate 1 and substantially in contact with one main surface 12 of the semiconductor region 3. Therefore, the semiconductor light emitting device of this example has a light reflection amount larger than that of Patent Document 1 and a forward voltage between the first and second electrodes 4 and 5 smaller than that of Patent Document 1. Have.
- Patent Document 1 it is required to provide both an ohmic contact alloy layer and a reflective layer, but in this embodiment, both the reflective layer and the ohmic contact are provided only by providing the light reflective layer 2.
- the manufacturing process can be simplified.
- the light reflecting layer 2 is formed of an Ag alloy, Ag oxidation and sulfurization can be prevented and aggregation of Ag can be prevented and the light reflecting layer 2 having good reflection characteristics can be easily formed. can do.
- the semiconductor light emitting device of FIG. 8 is obtained by modifying the shape of the support substrate 1, the position of the second electrode 5, and the pattern of the light reflecting layer 2 of FIG. 1, and additionally providing a current blocking layer 21. Is the same as Fig. 1.
- One main surface 10 of the conductive support substrate 1 shown in FIG. 8 has a larger surface area than one main surface 12 of the semiconductor region 3. Therefore, the support substrate 1 protrudes outward from the side surface of the semiconductor region 3.
- the second electrode 5 is disposed on one main surface 10 of the support substrate 1 and is electrically connected thereto.
- the light reflecting layer 2 in FIG. 8 is not formed at the central portion of one main surface 12 of the semiconductor region 3 but is formed outside the portion where the first electrode 4 is opposed.
- the current block layer 21 is in contact with a portion of the one main surface 12 of the semiconductor region 3 facing the first electrode 4.
- the current blocking layer 21 made of an insulating layer has a function of preventing or suppressing current from flowing in the inner part (center part) of the two chain lines 22 in FIG. 8 of the active layer 7.
- the size of the current block layer 21 is preferably coincident with the central portion indicated by the line 22 but can be made smaller or larger.
- the light reflecting layer 2 faces the first electrode 4 on one main surface 12 of the semiconductor region 3. It is desirable to form the entire portion outside the central portion that is not.
- the photoreflective layer 2 is 50% to 100%, more preferably 90% to 100% of the portion outside the central portion not facing the first electrode 4 of the one main surface 12 of the semiconductor region 3. It can also be formed in the range of%.
- the current blocking layer 21 is formed so as to extend from one main surface 12 of the semiconductor region 3 to one main surface 10 of the support substrate 1. Instead, the current blocking layer 21 is formed as shown in FIG. It can be formed only in a portion corresponding to the center of the first bonding layer 2a indicated by a solid line and indicated by a chain line in FIG. In this case, the second bonding layer 2b indicated by a chain line in FIG. 8 is formed so as to cover the current blocking layer 21 as in FIG. 9 described later. Further, instead of forming the current blocking layer 21 with an insulating layer, it can be formed with a metal layer or a semiconductor layer having a large contact resistance with the semiconductor region 3, or with a gap. , '
- Example 2 in FIG. 8 has the same effect as that of Example 1 in FIG. 1, and also has the effect of improving the light extraction efficiency due to the action of the current blocking layer 21. That is, the first electrode 4 disposed in the central portion of the other main surface 13 of the semiconductor region 3 is formed relatively thick because it is used as a bonding pad for connecting a connection member such as a wire (not shown). The light emitted from the active layer 7 is not transmitted. Therefore, the current flowing through the portion of the active layer 7 facing the first electrode 4 is a reactive current that is unrelated to light extraction.
- the current blocking layer 21 suppresses the current in the central portion of the active layer 7 that has little contribution to the extraction of light to the outside, and the magnitude of the contribution to the extraction of light to the outside increases the current in the outer peripheral portion of the active layer 7. Increases and the luminous efficiency is improved.
- the current block layer 21 in FIG. 8 can also be applied to a semiconductor light emitting device in which the second electrode 5 in FIG. 1 is disposed on the second main surface 11 of the support substrate 1.
- the semiconductor light emitting device of Example 3 shown in FIG. 9 is deformed in the size of the support substrate 1 in FIG. 1, the size of the second bonding layer 2b, and the position of the second electrode 5. Further, a current block layer 21 is provided, and the others are formed in the same manner as in FIG.
- a support substrate 1 in FIG. 9 has one main surface 10 larger than one main surface 12 of the semiconductor region 3 as in FIG.
- a second bonding layer 2b having a metallic force such as Ag or an Ag alloy is supported. Extends to the outer peripheral portion of one main surface 10 of the holding substrate:!.
- the second electrode 5 is electrically connected to the second bonding layer 2b.
- the current block layer 21 in FIG. 9 is arranged at the center of the first bonding layer 2a constituting the light reflecting layer 2.
- Example 3 in FIG. 9 has the same effect as Example 1 in FIG. 1 and Example 2 in FIG. 8, and also has an effect that a material having low conductivity can be used as the support substrate 1. That is, since the support substrate 1 of the embodiment of FIG. 9 is not used as a current path, the support substrate 1 can be formed of a semiconductor or insulator that does not contact the light reflecting layer 2 with low resistance. In FIG. 9, the combination of the silicon support substrate 1 and the second bonding layer 2b can also be called a support substrate.
- Example 4
- a semiconductor light emitting device of Example 4 shown in FIG. 10 is provided with a support substrate la made of metal that can be bonded to the light reflecting layer 2 instead of the support substrate 1 of FIG.
- the metal support substrate 1a is bonded directly or via a conductive bonding material to the light reflecting layer 2 formed on the main surface 12 of the main surface 12, and further provided with a current block layer 21 and an insulating protective film 22.
- the configuration is the same as in FIG.
- the light reflecting layer 2 in the embodiment of FIG. 10 can only be used in the same manner as the first bonding layer 2a on the semiconductor region 3 side shown in FIG.
- the supporting substrate la is made of a metal that can be bonded to the light reflecting layer 2, and does not have a component corresponding to the second bonding layer 2b shown in FIG. 4 before bonding.
- the insulating protective film 22 is made of an insulating film such as silicon oxynitride having higher adhesion to the side surface of the semiconductor region 3 than the known light-transmitting resin that covers the semiconductor light emitting element, and covers at least the side surface of the semiconductor region 3. It is provided to cover.
- the side surface of the semiconductor region 3 is shown to be vertical for simplicity of illustration, but actually has a slope.
- the protective film 22 contributes to prevent a leakage current and a short circuit on the side surface of the semiconductor region 3.
- Ag or Ag alloy constituting the light reflecting layer 2 is likely to migrate or move, but if the protective film 22 is provided, direct adhesion of Ag or Ag alloy to the side surface of the semiconductor region 3 can be prevented. .
- the same semiconductor as the insulating protective film 22 in FIG. 10 is the same as the semiconductor shown in FIG. 1, FIG. 8, and FIG. It is desirable to form on the side of region 3.
- the semiconductor light emitting device of Example 5 shown in FIG. 11 is the same as FIG. 1 except that the wavelength conversion layer 23 and the light transmissive electrode 4a are added to FIG. '
- the wavelength conversion layer 23 is made of a well-known phosphor film having a function of converting the wavelength of light emitted from the active layer 7.
- the wavelength conversion layer 23 also includes a plurality of island forces dispersedly arranged in a cross-sectional shape between the light reflection layer 2 and the semiconductor region 3.
- the wavelength conversion layer 23 is formed by a plurality of islands, a lattice shape, or a plurality of bands in a planar shape, and contacts only a part of one main surface 12 of the semiconductor region 3.
- the wavelength conversion layer 23 can also be provided on the entire one main surface 12 of the semiconductor region 3.
- the light emitted from the active layer 7 is extracted directly to the other main surface 13 side of the semiconductor region 3 and is reflected by the light reflecting layer 2 and extracted. Further, the light emitted from the active layer 7 is converted into a different wavelength by the wavelength conversion layer 23, and this is reflected by the other main surface 12 and extracted. Therefore, mixed light of the light emitted from the active layer 7 and the light converted by the wavelength conversion layer 23 can be extracted from the other main surface 13 of the semiconductor region 3.
- the first electrode 4 ′ includes a light transmissive electrode 4a and a bonding pad electrode 4b.
- the light transmissive electrode 4a is formed so as to cover almost the entire other main surface 13 of the semiconductor region 3, has a larger surface area than the bonding pad electrode 4b, and is relatively good on the outer peripheral side portion of the semiconductor region 3. It contributes to let current flow through.
- the bonding pad electrode 4b in FIG. 11 has a pattern facing only a part of the center of the other main surface 13 of the semiconductor region 3 in the same manner as the first electrode 4 shown in FIGS. 1 and 7 to 10. It can also be called a non-light-transmitting part.
- the light transmissive electrode 4a shown in FIG. 11 can also be provided in the semiconductor light emitting devices shown in FIGS. 1 and 8 to 10.
- Example 5 in Fig. 11 has the same effect of light reflecting layer 2 as in Fig. 1 in addition to the effect of wavelength conversion layer 23 described above. Note that the wavelength conversion layer 23 shown in FIG. 11 can also be applied to the semiconductor light emitting devices shown in FIGS. 0
- the semiconductor region 3 with another semiconductor such as an AlGalnP-based semiconductor other than a nitride semiconductor.
- a buffer layer of AIInGaN isotropic force can be interposed between the light reflecting layer 2 and the n-type semiconductor layer 6.
- a number of irregularities that contribute to an increase in light extraction efficiency can be formed on the other main surface 13 of the semiconductor region 3.
- the support substrate 1 is a metal substrate, it can be used as an electrode to omit the second electrode 5.
- the support substrate 1 can be formed by plating the metal relatively thick with respect to the light reflecting layer 2.
- a semiconductor element such as a diode can be formed here.
- a current blocking layer can be provided between the first electrode 4 and the semiconductor region 3.
- the first bonding layer 2 a in FIG. 3 can be omitted, and the second bonding layer 2 b in FIG. 4 can be bonded to the semiconductor region 3.
- the present invention can be used for a semiconductor light emitting device such as a display or a lamp.
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Description
Claims
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US11/619,079 US7675070B2 (en) | 2004-07-07 | 2007-01-02 | LED having a reflector layer of improved contact ohmicity |
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JP2004200849A JP3994287B2 (ja) | 2004-07-07 | 2004-07-07 | 半導体発光素子 |
JP2004-200849 | 2004-07-07 |
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US11/619,079 Continuation US7675070B2 (en) | 2004-07-07 | 2007-01-02 | LED having a reflector layer of improved contact ohmicity |
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WO2006004042A1 WO2006004042A1 (ja) | 2006-01-12 |
WO2006004042A9 true WO2006004042A9 (ja) | 2006-03-16 |
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US (1) | US7675070B2 (ja) |
JP (1) | JP3994287B2 (ja) |
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WO (1) | WO2006004042A1 (ja) |
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US7804100B2 (en) * | 2005-03-14 | 2010-09-28 | Philips Lumileds Lighting Company, Llc | Polarization-reversed III-nitride light emitting device |
TWI288979B (en) * | 2006-02-23 | 2007-10-21 | Arima Optoelectronics Corp | Light emitting diode bonded with metal diffusion and manufacturing method thereof |
JP5261923B2 (ja) * | 2006-10-17 | 2013-08-14 | サンケン電気株式会社 | 化合物半導体素子 |
US7795054B2 (en) | 2006-12-08 | 2010-09-14 | Samsung Led Co., Ltd. | Vertical structure LED device and method of manufacturing the same |
JP2008226866A (ja) * | 2007-02-13 | 2008-09-25 | Mitsubishi Chemicals Corp | GaN系LED素子および発光装置 |
US8026527B2 (en) * | 2007-12-06 | 2011-09-27 | Bridgelux, Inc. | LED structure |
KR20090072980A (ko) * | 2007-12-28 | 2009-07-02 | 서울옵토디바이스주식회사 | 발광 다이오드 및 그 제조방법 |
KR100934957B1 (ko) * | 2008-02-22 | 2010-01-06 | 한국과학기술연구원 | 압전 폴리머 기판을 이용한 하이브리드 전기소자와 그제조방법 |
WO2009117849A1 (en) * | 2008-03-26 | 2009-10-01 | Lattice Power (Jiangxi) Corporation | Semiconductor light-emitting device with a highly reflective ohmic-electrode |
DE102009025015A1 (de) * | 2008-07-08 | 2010-02-18 | Seoul Opto Device Co. Ltd., Ansan | Lichtemittierende Vorrichtung und Verfahren zu ihrer Herstellung |
KR100999699B1 (ko) * | 2008-09-01 | 2010-12-08 | 엘지이노텍 주식회사 | 발광 소자 패키지 |
JP5288967B2 (ja) * | 2008-09-22 | 2013-09-11 | ユー・ディー・シー アイルランド リミテッド | 発光素子及びその製造方法、並びに該発光素子を備えるディスプレイ |
JP2011035017A (ja) | 2009-07-30 | 2011-02-17 | Hitachi Cable Ltd | 発光素子 |
KR101712094B1 (ko) * | 2009-11-27 | 2017-03-03 | 포항공과대학교 산학협력단 | 질화물갈륨계 수직 발광다이오드 및 그 제조 방법 |
KR20120039412A (ko) * | 2010-10-15 | 2012-04-25 | 엘지이노텍 주식회사 | 발광 소자, 발광 소자 제조방법, 발광 소자 패키지 및 조명 시스템 |
JP2012122115A (ja) * | 2010-12-10 | 2012-06-28 | Mitsubishi Shindoh Co Ltd | 銅又は銅合金板へのAg−Snめっき方法及びその方法により製造されたAg−Snめっきが施された銅或いは銅合金板 |
CN103682020A (zh) * | 2012-08-31 | 2014-03-26 | 展晶科技(深圳)有限公司 | 发光二极管晶粒的制造方法 |
DE102013103216A1 (de) * | 2013-03-28 | 2014-10-02 | Osram Opto Semiconductors Gmbh | Strahlung emittierender Halbleiterchip |
JP6332301B2 (ja) * | 2016-02-25 | 2018-05-30 | 日亜化学工業株式会社 | 発光素子 |
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US6072818A (en) * | 1996-03-28 | 2000-06-06 | Fuji Photo Film Co., Ltd. | Semiconductor light emission device |
KR100447367B1 (ko) * | 1997-03-07 | 2004-09-08 | 샤프 가부시키가이샤 | 다중 양자 웰 구조 활성층을 갖는 질화갈륨계 반도체 발광 소자 및 반도체 레이저 광원 장치 |
JP3130292B2 (ja) * | 1997-10-14 | 2001-01-31 | 松下電子工業株式会社 | 半導体発光装置及びその製造方法 |
JP3087742B2 (ja) * | 1998-07-09 | 2000-09-11 | 住友電気工業株式会社 | 白色led |
JP3893874B2 (ja) * | 1999-12-21 | 2007-03-14 | 日亜化学工業株式会社 | 窒化物半導体発光素子の製造方法 |
JP2001196629A (ja) * | 2000-01-07 | 2001-07-19 | Denso Corp | 半導体発光装置及びその製造方法 |
JP2002151733A (ja) * | 2000-11-15 | 2002-05-24 | Hitachi Cable Ltd | 発光ダイオードおよびその製造方法 |
JP2002217450A (ja) | 2001-01-22 | 2002-08-02 | Sanken Electric Co Ltd | 半導体発光素子及びその製造方法 |
JP2003163366A (ja) * | 2001-11-26 | 2003-06-06 | Sanyo Electric Co Ltd | 発光ダイオード |
JP4074505B2 (ja) * | 2002-10-25 | 2008-04-09 | ローム株式会社 | 半導体発光素子の製法 |
JP3795007B2 (ja) * | 2002-11-27 | 2006-07-12 | 松下電器産業株式会社 | 半導体発光素子及びその製造方法 |
JP4371714B2 (ja) * | 2003-06-16 | 2009-11-25 | 日亜化学工業株式会社 | 窒化物半導体レーザ素子 |
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WO2006004042A1 (ja) | 2006-01-12 |
US7675070B2 (en) | 2010-03-09 |
US20070102711A1 (en) | 2007-05-10 |
JP2006024701A (ja) | 2006-01-26 |
TW200608607A (en) | 2006-03-01 |
JP3994287B2 (ja) | 2007-10-17 |
TWI274429B (en) | 2007-02-21 |
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