WO2013022228A2 - 누설전류 차단 효과가 우수한 질화물 반도체 발광소자 및 그 제조 방법 - Google Patents
누설전류 차단 효과가 우수한 질화물 반도체 발광소자 및 그 제조 방법 Download PDFInfo
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- WO2013022228A2 WO2013022228A2 PCT/KR2012/006179 KR2012006179W WO2013022228A2 WO 2013022228 A2 WO2013022228 A2 WO 2013022228A2 KR 2012006179 W KR2012006179 W KR 2012006179W WO 2013022228 A2 WO2013022228 A2 WO 2013022228A2
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- layer
- current blocking
- nitride
- semiconductor light
- nitride semiconductor
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 151
- 150000004767 nitrides Chemical class 0.000 title claims abstract description 132
- 239000004065 semiconductor Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 38
- 229910002704 AlGaN Inorganic materials 0.000 claims description 37
- 239000002019 doping agent Substances 0.000 claims description 32
- 239000012535 impurity Substances 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 229910052733 gallium Inorganic materials 0.000 claims description 6
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000005468 ion implantation Methods 0.000 claims description 3
- 238000002513 implantation Methods 0.000 claims 1
- 230000004913 activation Effects 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 252
- 229910052594 sapphire Inorganic materials 0.000 description 6
- 239000010980 sapphire Substances 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 5
- 238000001505 atmospheric-pressure chemical vapour deposition Methods 0.000 description 3
- 238000003877 atomic layer epitaxy Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 3
- 238000000927 vapour-phase epitaxy Methods 0.000 description 3
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- -1 InGaN Chemical class 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000407 epitaxy Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- 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
- H01L33/02—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 semiconductor bodies
- H01L33/26—Materials of the light emitting region
- H01L33/30—Materials of the light emitting region containing only elements of Group III and Group V of the Periodic Table
- H01L33/32—Materials of the light emitting region containing only elements of Group III and Group V of the Periodic Table containing nitrogen
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- 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
- H01L33/02—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 semiconductor bodies
- H01L33/14—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 semiconductor bodies with a carrier transport control structure, e.g. highly-doped semiconductor layer or current-blocking structure
Definitions
- the present invention relates to a nitride semiconductor light emitting device and a method for manufacturing the same, and more particularly to a nitride semiconductor light emitting device capable of blocking a leakage current and a method for manufacturing the same.
- FIG. 1 schematically shows a general nitride semiconductor light emitting device.
- the nitride semiconductor light emitting device includes a buffer layer 11, an n-type nitride layer 12, an active layer 15 having a multi-quantum well structure, and a p-type nitride layer 14 on a sapphire substrate 10. This includes a sequentially stacked structure.
- the p-side electrode 15 is formed on the upper surface of the p-type nitride layer 14, and the n-side electrode 16 is formed on the exposed surface of the n-type nitride semiconductor layer 12.
- the nitride semiconductor light emitting device injects electrons and holes into the active layer 13 and emits light when the electrons and holes are recombined.
- One object of the present invention is to provide a nitride semiconductor light emitting device that prevents leakage current to improve luminous efficiency.
- Another object of the present invention is to provide a method of manufacturing the above-mentioned nitride semiconductor light emitting device.
- the nitride semiconductor light emitting device of the present invention for achieving the above object comprises a current blocking portion formed between the substrate and the n-type nitride layer; An active layer formed on an upper surface of the n-type nitride layer; And a p-type nitride layer formed on an upper surface of the active layer, wherein the current blocking unit contains an insulating material.
- the current blocking unit includes at least one of an oxide layer, an undoped nitride layer, an oxide layer containing at least one of Ti, Fe, and Cr current blocking impurities, and the current blocking impurities. It characterized in that it comprises a nitride layer containing, and at least one layer of the Al containing nitride layer.
- the current blocking unit is an Al-containing nitride layer, for example, an Al x Ga (1-x) N layer, and x has an aluminum content of 0.1 to 0.4, and has a thickness of 0.02 ⁇ m to 0.5 ⁇ m. It is characterized by having a thickness range.
- the product (xT) of the aluminum content (x) and the current blocking part thickness (T) is 0.01 to 0.06.
- the current blocking unit includes: a first current blocking layer formed in the substrate direction; A second current blocking layer formed on an upper surface of the first current blocking layer; And a third current blocking layer formed on an upper surface of the second current blocking layer, wherein the first current blocking layer is an n-AlGaN layer containing an n-type dopant.
- the second current blocking layer is a p-AlGaN layer containing a p-type dopant
- the third current blocking layer is an n-AlGaN layer containing an n-type dopant.
- a method of manufacturing a nitride semiconductor light emitting device comprises the steps of forming a current blocking unit on the substrate; Forming an n-type nitride layer on the current blocking unit; Forming an active layer on the n-type nitride layer; And forming a p-type nitride layer on the active layer, wherein the current blocking unit contains an insulating material.
- the forming of the current blocking unit further includes forming a buffer layer between the substrate and the n-type nitride layer, wherein the current blocking unit is an upper surface of the buffer layer. And at least one of a lower surface of the buffer layer and an inside of the buffer layer.
- the nitride semiconductor light emitting device of the present invention and a method of manufacturing the same, an effect of improving the luminous efficiency by allowing a current to flow only into the active layer without leaking into the buffer layer and the substrate by using a current blocking unit that performs a function of current blocking. There is.
- FIG. 1 is a cross-sectional view showing the basic structure of a conventional nitride semiconductor light emitting device.
- FIG. 2 is a cross-sectional view illustrating a nitride semiconductor light emitting device according to an embodiment of the present invention.
- FIG 3 is a cross-sectional view illustrating a nitride semiconductor light emitting device according to another embodiment of the present invention.
- 4 to 8 are cross-sectional views illustrating a method of manufacturing a nitride semiconductor light emitting device according to another embodiment of the present invention.
- the nitride semiconductor light emitting device may include a substrate 100, a buffer layer 110, a current blocking unit 120, an n-type nitride layer 130, and an active layer 140. and a p-type nitride layer 150, a transparent electrode layer 160, a p-side electrode 171, and an n-side electrode 172.
- the substrate 100 may be a GaN substrate or a sapphire substrate having an uneven structure formed on an upper surface thereof.
- the buffer layer 110 is a layer provided to cover the upper surface of the substrate 100 selectively, and may be formed of AlN or GaN to solve the lattice mismatch between the substrate 100 and the current blocking unit 120.
- the buffer layer 110 may be formed in a form covering the upper surface of the substrate 100, the concave-convex structure is formed.
- the current blocking unit 120 is formed between the buffer layer 110 and the n-type nitride layer 130 and supplies current to the buffer layer 110 and the substrate 100 so that the current flows to the active layer 140 without leakage. Can block function.
- the current blocking unit 120 may be formed on any one of the upper surface, the lower surface and the inside of the buffer layer 110.
- the current blocking unit 120 may be formed of an oxide layer, an undoped nitride layer, a layer made of an oxide or nitride containing at least one of impurity blocking currents such as Ti, Fe, Cr, or an Al-containing nitride layer. Can be.
- the current blocking unit 120 may include, for example, an oxide layer such as SiO 2 , a SiN layer, an undoped GaN layer, and a nitride such as InGaN, or Ti, Fe, Cr, or the like. It may be formed of a layer containing an impurity for blocking current of the AlGaN layer.
- the thickness of the current blocking unit 120 is determined according to the material of the layer. For example, when the layer is made of AlGaN, it may have a thickness range of 0.02 ⁇ m to 0.5 ⁇ m. In this case, when the thickness of the current blocking unit 120 is outside this range and the thickness of the current blocking unit 120 is less than 0.02 ⁇ m, current blocking may not be performed. When the current blocking unit 120 exceeds 0.5 ⁇ m, lattice mismatch occurs with the n-type nitride layer 130, resulting in strain defects. Generates.
- the n-type nitride layer 130 is a layer provided on the upper surface of the current blocking unit 120.
- a first layer made of AlGaN doped with Si and a second layer made of GaN of undoped are alternately provided. It may be formed in a laminated structure.
- the n-type nitride layer 130 may be grown as a single nitride layer, but may be formed as a stacked structure in which the first layer and the second layer are alternately provided to act as a carrier-limiting layer having good crystallinity without cracks. Can be.
- the active layer 140 may be provided as a single layer between the n-type nitride layer 130 and the p-type nitride layer 150 or a multi-quantum well structure in which a plurality of quantum well layers and quantum barrier layers are alternately stacked. Can be.
- the active layer 140 is made of a multi-quantum well structure
- the quantum barrier layer may be a quaternary nitride layer of AlGaInN containing Al, for example, the quantum well layer may be made of, for example, InGaN.
- the active layer 140 of such a structure can suppress spontaneous polarization due to stress and deformation generated.
- the p-type nitride layer 150 may be formed, for example, in a stacked structure in which a first layer of p-type AlGaN doped with Mg with a p-type dopant is alternated with a second layer made of p-type GaN doped with Mg. .
- the p-type nitride layer 150 may act as a carrier limiting layer similarly to the n-type nitride layer 130.
- the transparent electrode layer 160 is made of a transparent conductive oxide on the upper surface of the p-type nitride layer 150, and the material includes elements such as In, Sn, Al, Zn, Ga, and the like, for example, ITO, CIO, and ZnO. , NiO, In 2 O 3 It may be formed.
- Such a nitride semiconductor light emitting device is provided with a current blocking unit 120 between the buffer layer 110 and the n-type nitride layer 130, the current by the insulating function of the current blocking unit 120 May flow to the active layer 140 without leaking to the buffer layer 110 and the substrate 100.
- the current blocking unit 120 is provided between the buffer layer 110 and the n-type nitride layer 130, but is not limited thereto, the current blocking unit 120 is formed between the substrate 100 and the buffer layer 110 or Or may be formed inside the buffer layer 110.
- the current blocking unit 120 In order to verify the efficiency of the current blocking unit 120, for example, a current blocking between the buffer layer 110 of 2 ⁇ m thickness and the n-type nitride layer 130 of 4 ⁇ m thickness in a chip of 1200 ⁇ m 600 ⁇ m size
- the Al content of the current blocking unit 120 is in the range of 10 to 40 atom% of the total number of atoms of aluminum (Al) and gallium (Ga), that is, x in the range of 0.1 to 0.4 in Al x Ga (1-x) N It is desirable to have.
- the conditions of the other layers are the same, and after forming the Al x Ga (1-x) N current blocking unit 120 of the Al content (x) and the layer thickness ( ⁇ m) conditions shown in Table 1, respectively, The rate (%) at which the measured voltage was detected by 2.1 V or more by applying a current of 1 mA was shown, that is, the yield of 1 mA Vf.
- This characteristic may be regarded as a result of the current blocking unit 120 performing a function of blocking current so that the current flows only into the active layer 140 without leaking into the buffer layer 110 and the substrate 100.
- a nitride semiconductor light emitting device according to another embodiment of the present invention will be described with reference to FIG. 3.
- the detailed description of the related known structure or function of the nitride semiconductor light emitting device may obscure the gist of the present invention, the detailed description thereof will be omitted.
- the nitride semiconductor light emitting device includes a substrate 200, a buffer layer 210, a current blocking unit 220 formed of a stacked structure of at least three layers, and an n-type nitride layer. 230, an active layer 240, a p-type nitride layer 250, a transparent electrode layer 260, a p-side Z electrode 271 and an n-side electrode 272.
- the current blocking unit 220 may include a first current blocking layer 221, a second current blocking layer 222, and a third current blocking layer 223 sequentially formed on an upper surface of the buffer layer 210. .
- Each of the current blocking layers 221, 222, and 223 of the current blocking unit 220 is selected from an oxide layer, a nitride layer, a layer made of an oxide or nitride containing at least one impurity for blocking current such as Ti, Fe, Cr, and an AlGaN layer. It can be formed of either layer.
- each of the current blocking layers 221, 222, and 223 is formed by selecting any one of the above layers, and the first current blocking layer 221 is an oxide layer of SiO 2 and a second current blocking layer 222.
- the nitride layer of silver undoped GaN and the third current blocking layer 223 may be formed of an AlGaN layer.
- each of the first current blocking layer 221 to the third current blocking layer 223 contains an Al content in the range of 10 to 40 atom% of the total number of atoms of aluminum (Al) and gallium (Ga), respectively, n
- the nitride layer having a dopant or a p-type dopant may be formed into an npn multilayer structure of an AlGaN layer containing an n-type dopant / AlGaN layer containing an p-type dopant / AlGaN layer containing an n-type dopant.
- each of the first current blocking layer 221 to the third current blocking layer 223 may be preferably formed such that the product of Al content (x) and thickness ( ⁇ m) has a range of 0.01 to 0.06.
- the n-type dopant of the first current blocking layer 221 and the third current blocking layer 223 is contained at a higher concentration than the p-type dopant concentration of the second current blocking layer 222.
- the nitride semiconductor light emitting device applies an npn nitride stacked structure containing an n-type dopant or a p-type dopant from the first current blocking layer 221 to the third current blocking layer 223. .
- the nitride semiconductor light emitting device contains the p-type dopant under the influence of the n-AlGaN layer containing the high-concentration n-type dopant up and down in the current blocking unit 220 having the npn structure.
- a junction region of the p-AlGaN layer is formed as a depletion region so that the current is blocked, thereby completely blocking the current leaking into the buffer layer 210 and the substrate 200.
- the method of manufacturing a nitride semiconductor light emitting device according to another embodiment of the present invention is an npn nitride stacked structure containing an n-type dopant or p-type dopant from the first current blocking layer 221 to the third current blocking layer 223 It will be described by applying the current blocking unit 220.
- the buffer layer 210 and the first current blocking layer 221 are sequentially formed on the upper surface of the substrate 200.
- the substrate 200 may be a GaN substrate or a sapphire substrate having an uneven structure formed on an upper surface thereof.
- a concave-convex structure is formed on the upper surface by using a sapphire substrate as the substrate 200. can do.
- the buffer layer 210 may be selectively formed on the upper surface of the substrate 200 using a material such as AlN or GaN to eliminate the lattice mismatch between the substrate 110 and the first current blocking layer 221.
- the buffer layer 210 may be formed in a form covering the upper surface of the substrate 200, the concave-convex structure is formed.
- a first current blocking layer 221 is formed on the top surface of the buffer layer 210.
- the first current blocking layer 221 is selected from an oxide layer, an undoped nitride layer, a layer made of an oxide or nitride containing at least one of current blocking impurities such as Ti, Fe, Cr, and an Al-containing nitride layer. It can be formed of either layer.
- the Al-containing nitride layer may be an AlGaN layer.
- the first current blocking layer 221 is any one selected from atomic layer epitaxy (ALE), atmospheric pressure chemical vapor deposition (APCVD), metal organic chemical vapor deposition (MOCVD), and plasma enhanced chemical vapor deposition (PECVD).
- ALE atomic layer epitaxy
- APCVD atmospheric pressure chemical vapor deposition
- MOCVD metal organic chemical vapor deposition
- PECVD plasma enhanced chemical vapor deposition
- the n-AlGaN layer can be formed by the vapor phase epitaxy growth method.
- the first current blocking layer 221 may be formed of an n-AlGaN layer in which an n-type dopant is implanted by an ion implantation method after forming an AlGaN layer by a vapor phase epitaxy growth method.
- the first current blocking layer 221 is formed of an n-AlGaN layer, Al content is 10 ⁇ 40 atom% of the total number of atoms of aluminum and gallium, that is, Al x Ga (1-x) N (0.1 ⁇ x ⁇ 0.4 It can be formed to be adjusted within the range of).
- the first current blocking layer 221 may be formed so that the product of Al content (x) and thickness ( ⁇ m) has a range of 0.01 to 0.06.
- a second current blocking layer 222 of the p-AlGaN layer is formed on the upper surface of the first current blocking layer 221.
- the second current blocking layer 222 is an oxide layer, an undoped nitride layer, a layer made of an oxide or nitride containing at least one impurity for current blocking, such as Ti, Fe, Cr, and Al x Ga (1-x) N It may be formed of any one selected from (0.1 ⁇ x ⁇ 0.4) layer.
- the second current blocking layer 222 is preferably a gaseous epitaxy growth method selected from ALE, APCVD, and PECVD, similarly to the first current blocking layer 221, and the product of the Al content and the layer thickness is in the range of 0.01 to 0.06. It may be formed of a p-AlGaN layer having a.
- a third current blocking layer 223 of the n-AlGaN layer is formed on the top surface of the second current blocking layer 222 as shown in FIG. 6.
- the third current blocking layer 223 is formed of an oxide or nitride containing at least one impurity for current blocking, such as an oxide layer, an undoped nitride layer, Ti, Fe, or Cr, similarly to the first current blocking layer 221. , And an Al x Ga (1-x) N (0.1 ⁇ x ⁇ 0.4) layer.
- the third current blocking layer 223 is formed of an n-AlGaN layer having a product of Al content and layer thickness in a range of 0.01 to 0.06 by a vapor phase epitaxy growth method in the same manner as the first current blocking layer 221. Can be.
- the n-type nitride layer 230 has a third current.
- the upper surface of the blocking layer 223 is formed.
- the current blocking unit 220 is formed on the upper surface of the buffer layer 210, the current blocking unit 220 may be formed on any one of the upper surface, the lower surface and the inside of the buffer layer 210.
- the n-type nitride layer 230 may be formed by supplying a silane gas including an n-type dopant such as NH 3 , trimetalgallium (TMG), and Si to convert the n-GaN layer into an n-type nitride layer 230. To grow).
- a silane gas including an n-type dopant such as NH 3 , trimetalgallium (TMG), and Si to convert the n-GaN layer into an n-type nitride layer 230.
- TMG trimetalgallium
- the active layer 240 is grown on the top surface of the n-type nitride layer 230.
- the active layer 240 may be formed in a single quantum well structure or a multi-quantum well structure in which a plurality of quantum well layers and a quantum barrier layer are alternately stacked.
- the active layer 240 according to another embodiment of the present invention may include a quantum well layer and a quantum well layer. A multi-quantum well structure in which a plurality of quantum barrier layers are alternately stacked is applied.
- the quantum barrier layer of the active layer 240 is, for example, a quaternary nitride layer of AlGaInN containing Al
- the quantum well layer is formed of, for example, a multi-quantum well structure in which a plurality of InGaN layers are stacked, thereby spontaneous polarization due to stress and deformation. It is formed to suppress.
- the p-type nitride layer 250 and the transparent electrode layer 260 are sequentially formed in the upper surface direction of the active layer 240 similarly to the general nitride semiconductor light emitting device.
- lithography etching and cleaning are performed from one region of the transparent electrode layer 260 to a part of the n-type nitride layer 230, thereby cleaning the n-type nitride layer ( Some areas of 230 may be exposed.
- the p-side electrode 271 and the n-side electrode 2 may be formed on the upper surface of the transparent electrode layer 260 and each of the exposed portions of the n-type nitride layer 230. 272).
- Such a method of manufacturing a nitride semiconductor light emitting device includes an AlGaN layer / p-type dopant containing an n-type dopant from the first current blocking layer 221 to the third current blocking layer 223.
- a method of forming a current blocking portion 220 of an npn nitride stacked structure of an AlGaN layer containing an AlGaN layer / n-type dopant is described, the current blocking portion 220 is not limited thereto and is formed of a laminated structure of three or more layers. May be
- the current is leaked to the buffer layer 210 and the substrate 200 by using the current blocking unit 220 having a laminated structure of three or more layers.
- a nitride semiconductor light emitting device that can be prevented can be provided.
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Claims (13)
- 기판과 n형 질화물층 사이에 형성된 전류 차단부;상기 n형 질화물층 상에 형성된 활성층; 및상기 활성층 상에 형성된 p형 질화물층을 포함하고,상기 전류 차단부는 절연 물질을 함유하는 것을 특징으로 하는 질화물 반도체 발광소자.
- 제 1 항에 있어서,상기 기판은 요철 구조가 형성된 상부면을 갖는 것을 특징으로 하는 질화물 반도체 발광소자.
- 제 1 항에 있어서,상기 기판과 n형 질화물층 사이에 버퍼층을 더 포함하고,상기 전류 차단부는 상기 버퍼층의 상부면, 상기 버퍼층의 하부면 및 상기 버퍼층의 내부 중 적어도 어느 하나에 형성되는 것을 특징으로 하는 질화물 반도체 발광소자.
- 제 1 항에 있어서,상기 전류 차단부는 산화물층, 언도프(undoped) 질화물층, Ti, Fe 및 Cr의 전류 차단용 불순물 중 적어도 하나를 함유한 산화물층, 상기 전류 차단용 불순물 중 적어도 하나를 함유한 질화물층, 및 Al 함유 질화물층 중 선택된 적어도 하나 이상의 층을 포함하는 것을 특징으로 하는 질화물 반도체 발광소자.
- 제 1 항에 있어서,상기 전류 차단부는 AlxGa(1-x)N (0.1≤x≤0.4)으로 형성되는 것을 특징으로 하는 질화물 반도체 발광소자.
- 제 5 항에 있이서,상기 전류 차단부는0.02㎛ ~ 0.5㎛의 두께로 형성되는 것을 특징으로 하는 질화물 반도체 발광소자.
- 제 1 항에 있어서,상기 전류 차단부는 AlxGa(1-x)N층이고, 상기 Al 함량(x)과 층 두께(㎛)의 곱이 0.01~0.06 범위를 갖는 것을 특징으로 하는 질화물 반도체 발광소자.
- 제 1 항에 있어서,상기 전류 차단부는제 1 전류 차단층;상기 제 1 전류 차단층의 상부면에 형성된 제 2 전류 차단층; 및상기 제 2 전류 차단층의 상부면에 형성된 제 3 전류 차단층을 포함하여 적어도 3층의 적층 구조로 형성되고,상기 제 1 전류 차단층은 n형 도펀트를 함유한 AlGaN 층이며, 상기 제 2 전류 차단층은 p형 도펀트를 함유한 AlGaN 층이며, 상기 제 3 전류 차단층은 n형 도펀트를 함유한 AlGaN 층 인 것을 특징으로 하는 질화물 반도체 발광소자.
- 제 8 항에 있어서,상기 제 1 전류 차단층과 제 3 전류 차단층은 상기 제 2 전류 차단층의 p형 도펀트 농도보다 높은 농도의 n형 도펀트를 함유한 것을 특징으로 하는 질화물 반도체 발광소자.
- 제 8 항에 있어서,상기 Al 함량은 상기 전류 차단부의 알루미늄 및 갈륨 전체 원자 수의 10~40atom%인 것을 특징으로 하는 질화물 반도체 발광소자.
- 제 8 항에 있어서,상기 제 1 전류 차단층 내지 제 3 전류 차단층 각각은 AlxGa(1-x)N층이고, 상기 Al 함량(x)과 층 두께(㎛)의 곱이 0.01~0.06 범위를 갖는 것을 특징으로 하는 질화물 반도체 발광소자.
- 기판과 n형 질화물층 사이에 전류 차단부를 형성하는 단계;상기 n형 질화물층 상에 활성층을 형성하는 단계; 및상기 활성층 상에 p형 질화물층을 형성하는 단계를 포함하고,상기 전류 차단부를 형성하는 단계는상기 전류 차단부를 산화물층, 언도프 질화물층, Ti, Fe 및 Cr의 전류 차단용 불순물 중 적어도 하나를 함유한 산화물층, 상기 전류 차단용 불순물 중 적어도 하나를 함유한 질화물층, 및 Al 함유 질화물층 중 선택된 적어도 하나 이상의 층을 포함하여 형성하는 것을 특징으로 하는 질화물 반도체 발광소자의 제조 방법.
- 기판과 n형 질화물층 사이에 전류 차단부를 형성하는 단계;상기 n형 질화물층 상에 활성층을 형성하는 단계; 및상기 활성층 상에 p형 질화물층을 형성하는 단계;를 포함하고,상기 전류 차단부를 형성하는 단계는n형 도펀트를 함유한 AlGaN으로 형성되는 제 1 전류 차단층과, 상기 제 1 전류 차단층의 상부면에 형성되며 p형 도펀트를 함유한 AlGaN 으로 형성되는 제 2 전류 차단층 및 상기 제 2 전류 차단층의 상부면에 형성되며 n형 도펀트를 함유한 AlGaN으로 형성되는 제 3 전류 차단층을 포함하는 적어도 3층의 적층 구조로 형성하고,상기 제 1 전류 차단층, 제 2 전류 차단층 및 제 3 전류 차단층 각각에서 알루미늄의 함량이 알루미늄 및 갈륨 전체 원자 수의 10~40atom%가 되도록 알루미늄의 함량을 조절하며,상기 제 1 전류 차단층과 제 3 전류 차단층을 AlGaN층에 n형 도펀트를 주입하는 이온 주입 방법(Implantation)을 이용하여 n-AlGaN층으로 형성하며,상기 제 2 전류 차단층을 AlGaN층에 p형 도펀트를 주입하는 이온 주입 방법을 이용하여 p-AlGaN층으로 형성하는 것을 특징으로 하는 질화물 반도체 발광소자의 제조 방법.
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US20140167067A1 (en) | 2014-06-19 |
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