KR100564912B1 - Method of transparent electrode for ohmic contact to p-AlGaInN compound semiconductor using zinc oxide - Google Patents
Method of transparent electrode for ohmic contact to p-AlGaInN compound semiconductor using zinc oxide Download PDFInfo
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- KR100564912B1 KR100564912B1 KR1020040025463A KR20040025463A KR100564912B1 KR 100564912 B1 KR100564912 B1 KR 100564912B1 KR 1020040025463 A KR1020040025463 A KR 1020040025463A KR 20040025463 A KR20040025463 A KR 20040025463A KR 100564912 B1 KR100564912 B1 KR 100564912B1
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 27
- 239000004065 semiconductor Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 16
- 150000001875 compounds Chemical class 0.000 title claims abstract description 15
- 229910000480 nickel oxide Inorganic materials 0.000 claims abstract description 17
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000003780 insertion Methods 0.000 claims abstract description 16
- 230000037431 insertion Effects 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims abstract description 14
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims abstract description 8
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910001887 tin oxide Inorganic materials 0.000 claims abstract description 7
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract description 6
- UNRNJMFGIMDYKL-UHFFFAOYSA-N aluminum copper oxygen(2-) Chemical compound [O-2].[Al+3].[Cu+2] UNRNJMFGIMDYKL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910000428 cobalt oxide Inorganic materials 0.000 claims abstract description 4
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 4
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 4
- HBEQXAKJSGXAIQ-UHFFFAOYSA-N oxopalladium Chemical compound [Pd]=O HBEQXAKJSGXAIQ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910003445 palladium oxide Inorganic materials 0.000 claims abstract description 4
- 229910001923 silver oxide Inorganic materials 0.000 claims abstract description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 claims description 4
- 229910001195 gallium oxide Inorganic materials 0.000 claims description 4
- 229910003437 indium oxide Inorganic materials 0.000 claims description 4
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052790 beryllium Inorganic materials 0.000 claims description 3
- 229910052793 cadmium Inorganic materials 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000002019 doping agent Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 229910052804 chromium Inorganic materials 0.000 claims 1
- 239000011651 chromium Substances 0.000 claims 1
- OTCVAHKKMMUFAY-UHFFFAOYSA-N oxosilver Chemical class [Ag]=O OTCVAHKKMMUFAY-UHFFFAOYSA-N 0.000 claims 1
- QHGNHLZPVBIIPX-UHFFFAOYSA-N tin(ii) oxide Chemical class [Sn]=O QHGNHLZPVBIIPX-UHFFFAOYSA-N 0.000 claims 1
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 abstract description 6
- 239000005751 Copper oxide Substances 0.000 abstract description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 abstract description 3
- 229910000423 chromium oxide Inorganic materials 0.000 abstract description 3
- 229910000431 copper oxide Inorganic materials 0.000 abstract description 3
- 238000002834 transmittance Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 abstract 4
- 230000006866 deterioration Effects 0.000 abstract 1
- 239000011229 interlayer Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 30
- 229910002601 GaN Inorganic materials 0.000 description 13
- 229910052759 nickel Inorganic materials 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 239000010931 gold Substances 0.000 description 6
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
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Abstract
본 발명에 따른 오믹접촉 투명전극층 형성방법은, p-AlGaInN 화합물 반도체층(120) 상에 니켈산화물(NiO1-x), 망간산화물(MnO1-x), 철산화물(FeO 3/2(1-x)), 코발트산화물(CoO1-x), 크롬산화물(CrO3/2(1-x)), 구리산화물(CuO1-x), 주석산화물(SnO 1-x), 은산화물(AgO1-x), 구리알루미늄산화물(CuAlO2(1-x)), 및 팔라듐산화물(PdO1-x )으로 이루어진 금속 산화물군으로부터 선택된 적어도 어느 하나를 포함하여 이루어지는 삽입층(130)과 아연 산화물층(140)을 순차적으로 적층하고 상기 결과물을 100~1200℃의 온도범위에서 열처리하는 것을 특징으로 한다. 아연산화물의 우수한 열적 안정성 및 투광성으로 인해서 우수한 광방출효율을 갖는 발광소자를 제조할 수 있으며, 발광소자의 고온 열처리에 의한 특성 저하를 방지할 수 있게 된다. In the method of forming an ohmic contact transparent electrode layer according to the present invention, a nickel oxide (NiO 1-x ) , manganese oxide (MnO 1-x ), and iron oxide (FeO 3/2 (1 ) are formed on the p-AlGaInN compound semiconductor layer 120. -x) ), cobalt oxide (CoO 1-x ), chromium oxide (CrO 3/2 (1-x) ), copper oxide (CuO 1-x ), tin oxide (SnO 1-x ), silver oxide (AgO Insertion layer 130 and zinc oxide layer comprising at least one selected from the group consisting of metal oxides consisting of 1-x ), copper aluminum oxide (CuAlO 2 (1-x) ), and palladium oxide (PdO 1-x ). The 140 is sequentially laminated and characterized in that the resulting heat treatment in a temperature range of 100 ~ 1200 ℃. Due to the excellent thermal stability and light transmittance of the zinc oxide, it is possible to manufacture a light emitting device having excellent light emission efficiency, and to prevent the deterioration of properties due to high temperature heat treatment of the light emitting device.
아연 산화물, 니켈 산화물, 삽입층, 열처리, 오믹접촉, 투명전극, GaNZinc oxide, nickel oxide, interlayer, heat treatment, ohmic contact, transparent electrode, GaN
Description
도 1은 본 발명의 실시예에 따른 p-AlxGayInzN 화합물 반도체의 오믹접촉 투명전극층 형성방법을 설명하기 위한 단면도;1 is a cross-sectional view for explaining a method of forming an ohmic contact transparent electrode layer of a p-Al x Ga y In z N compound semiconductor according to an embodiment of the present invention;
도 2는 니켈금속/아연산화물과 니켈산화물/아연산화물로 이루어진 오믹접촉계에 대한 전류-전압 그래프;2 is a current-voltage graph for an ohmic contact system consisting of nickel metal / zinc oxide and nickel oxide / zinc oxide;
도 3은 니켈금속/아연산화물과 니켈산화물/아연산화물로 이루어진 오믹접촉계의 깊이에 따른 원소 분포도이다. 3 is an element distribution diagram according to a depth of an ohmic contact system composed of nickel metal / zinc oxide and nickel oxide / zinc oxide.
< 도면의 주요 부분에 대한 참조번호의 설명 ><Description of Reference Numbers for Main Parts of Drawings>
110: 산화알루미늄 기판 120: p-GaN층110: aluminum oxide substrate 120: p-GaN layer
130: 삽입층 140: 아연 산화물층130: insertion layer 140: zinc oxide layer
본 발명은 p-AlxGayInzN 화합물 반도체의 오믹접촉 투명전극층 형성방법에 관한 것으로서, 특히 아연산화물을 이용하는 p-AlxGayInzN 화합물 반도체의 오믹접촉 투명전극층 형성방법에 관한 것이다. 여기서, 0≤x, y, z≤1, x+y+z=1 이다. The present invention relates to a method of forming an ohmic contact transparent electrode layer of a p-Al x Ga y In z N compound semiconductor, and more particularly to a method of forming an ohmic contact transparent electrode layer of a p-Al x Ga y In z N compound semiconductor using zinc oxide. will be. Here, 0 ≦ x, y, z ≦ 1 and x + y + z = 1.
p-GaN에 오믹접촉되는 전극층으로서 니켈(Ni)을 기본으로 하는 금속층, 예컨대 니켈(Ni)/금(Au)의 금속층이 널리 사용되어 왔다. 니켈을 기본으로 하는 금속층을 전극층으로 사용할 경우 산소(O2) 분위기에서 500~600℃의 온도범위에서 열처리하면 질화갈륨과 니켈의 계면에 p형 반도체 산화물인 니켈 산화물(NiO)이 형성되고, 또한 갈륨이 바깥쪽으로 확산하여 질화갈륨 표면 부위에 다수 캐리어인 홀(hole)이 공급되어 질화갈륨 표면부근에서의 실효 캐리어 농도(effective carrier concentration)가 증가되어 10-3 ~ 10-4 Ωcm2 정도의 비접촉저항을 갖는 오믹접촉을 얻을 수 있게 된다. As an electrode layer in ohmic contact with p-GaN, a metal layer based on nickel (Ni), for example, a metal layer of nickel (Ni) / gold (Au), has been widely used. When using a nickel-based metal layer as the electrode layer, oxygen (O2Heat treatment in the temperature range of 500 ~ 600 ℃ in the atmosphere forms nickel oxide (NiO), a p-type semiconductor oxide, at the interface between gallium nitride and nickel. holes are supplied to increase the effective carrier concentration near the gallium nitride surface.-3To 10-4Ωcm2It is possible to obtain an ohmic contact having a specific contact resistance.
그러나, 니켈(Ni)/금(Au) 투명전극층의 경우, 열적 불안정성으로 인하여 실제 발광소자에 응용시 소자 신뢰성에 있어 많은 문제가 발생한다. 또한 p형 질화갈륨 위에 적층되는 금속층이 낮은 실효 저항(effective resistance)과 높은 투광성을 갖도록 하기 위해서는 소정의 임계 두께를 가져야 하는 한계가 있다. 따라서, 니켈(Ni)/금(Au) 투명전극층은 낮은 접촉저항을 얻을 수는 있으나 좋은 발광효율을 얻지 못하는 단점을 가진다.However, in the case of the nickel (Ni) / gold (Au) transparent electrode layer, due to thermal instability, there are many problems in device reliability when applied to the actual light emitting device. In addition, in order for the metal layer stacked on the p-type gallium nitride to have a low effective resistance and a high light transmittance, there is a limit to have a predetermined critical thickness. Therefore, the nickel (Ni) / gold (Au) transparent electrode layer can obtain a low contact resistance but has a disadvantage of not obtaining a good luminous efficiency.
따라서, 본 발명이 이루고자 하는 기술적 과제는, 낮은 오믹접촉저항을 가지면서 투명하고 열적으로도 안정한 새로운 오믹접촉계(ohmic contact system)를 도입함으로써 상술한 종래의 문제점을 해결할 수 있는 p-AlxGayInzN 화합물 반도체의 오믹접촉 투명전극층 형성방법을 제공하는 데 있다.
Accordingly, the object of the present invention are, while having a low ohmic contact resistance, a transparent and thermally FIG stable new ohmic contact system (ohmic contact system) to which can solve the conventional problems above-described p-Al x Ga by introducing It is to provide a method for forming an ohmic contact transparent electrode layer of y In z N compound semiconductor.
상기 기술적 과제를 달성하기 위한 본 발명에 따른 오믹접촉 투명전극층 형성방법은: p-AlGaInN 화합물 반도체층 상에 니켈산화물(NiO1-x), 망간산화물(MnO1-x), 철산화물(FeO3/2(1-x)), 코발트산화물(CoO1-x), 크롬산화물(CrO3/2(1-x)), 구리산화물(CuO1-x), 주석산화물(SnO1-x), 은산화물(AgO1-x), 구리알루미늄산화물(CuAlO2(1-x)), 및 팔라듐산화물(PdO1-x)으로 이루어진 금속 산화물군으로부터 선택된 적어도 어느 하나를 포함하여 이루어지는 삽입층과 아연 산화물층을 순차적으로 적층하고, 상기 화합물 반도체층과 상기 삽입층과 상기 아연산화물층으로 이루어진 결과물을 100~1200℃의 온도범위에서 열처리하는 것을 특징으로 한다.Method for forming an ohmic contact transparent electrode layer according to the present invention for achieving the technical problem is: nickel oxide (NiO 1-x ) , manganese oxide (MnO 1-x ), iron oxide (FeO 3 ) on the p-AlGaInN compound semiconductor layer / 2 (1-x) ), cobalt oxide (CoO 1-x ), chromium oxide (CrO 3/2 (1-x) ), copper oxide (CuO 1-x ), tin oxide (SnO 1-x ), Insertion layer and zinc oxide comprising at least one selected from the group of metal oxides consisting of silver oxide (AgO 1-x ), copper aluminum oxide (CuAlO 2 (1-x) ), and palladium oxide (PdO 1-x ) The layers are sequentially stacked, and the resultant consisting of the compound semiconductor layer, the insertion layer, and the zinc oxide layer is heat-treated at a temperature range of 100 to 1200 ° C.
상기 열처리는 질소 및 산소로 이루어진 군으로부터 선택된 적어도 어느 하 나를 포함하는 분위기에서 행해지는 것이 바람직하다. The heat treatment is preferably carried out in an atmosphere containing at least one selected from the group consisting of nitrogen and oxygen.
상기 p-AlGaInN 화합물 반도체층의 p형 도펀트로서 Be, Mg, Ca, Zn, 및 Cd으로 이루어진 군으로부터 선택된 적어도 어느 하나가 사용되어질 수 있다. At least one selected from the group consisting of Be, Mg, Ca, Zn, and Cd may be used as the p-type dopant of the p-AlGaInN compound semiconductor layer.
상기 아연 산화물층은 인듐 산화물, 주석 산화물, 갈륨 산화물, 및 알루미늄 산화물로 이루어진 군으로부터 선택된 적어도 어느 하나를 포함하여 이루어진 것일 수 있다. The zinc oxide layer may include at least one selected from the group consisting of indium oxide, tin oxide, gallium oxide, and aluminum oxide.
상기 삽입층은 0.1~1000nm의 두께를 가지는 것이 바람직하다. The insertion layer preferably has a thickness of 0.1 ~ 1000nm.
상기 아연 산화물층은 0.1~1000nm의 두께를 가지는 것이 바람직하다. The zinc oxide layer preferably has a thickness of 0.1 ~ 1000nm.
상기 열처리가 1초 내지 3시간 동안 행해지는 것이 바람직하다. Preferably, the heat treatment is performed for 1 second to 3 hours.
상기 삽입층을 적층하기 이전에 염산(HCl), 인산(H3PO4), 수산화칼륨(KOH), 및 왕수(Aqua regia solution) 중에서 선택된 어느 하나로 상기 p-AlGaInN 화합물 반도체층의 표면을 처리하면 더 좋다. If the surface of the p-AlGaInN compound semiconductor layer is treated with any one selected from hydrochloric acid (HCl), phosphoric acid (H 3 PO 4 ), potassium hydroxide (KOH), and aqua regia solution before stacking the insertion layer, much better.
이하에서, 본 발명의 바람직한 실시예를 첨부한 도면들을 참조하여 상세히 설명한다. 아래의 실시예는 본 발명의 내용을 이해하기 위해 제시된 것일 뿐이며 당 분야에서 통상의 지식을 가진 자라면 본 발명의 기술적 사상 내에서 많은 변형이 가능할 것이다. 따라서, 본 발명의 권리범위가 이러한 실시예에 한정되어지는 것으로 해석되어져서는 안된다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. The following examples are only presented to understand the content of the present invention, and those skilled in the art will be capable of many modifications within the technical spirit of the present invention. Accordingly, the scope of the present invention should not be construed as being limited to these embodiments.
도 1은 본 발명의 실시예에 따른 p-AlxGayInzN 화합물 반도체의 오믹접촉 투 명전극층 형성방법을 설명하기 위한 단면도이다. 1 is a cross-sectional view illustrating a method of forming an ohmic contact transparent electrode layer of a p-Al x Ga y In z N compound semiconductor according to an embodiment of the present invention.
먼저, 산화알루미늄 기판(110) 상에 MOCVD 또는 MBE법으로 p-GaN층(120)을 형성하고, p-GaN층(120) 상에 PVD 또는 CVD법으로 삽입층(130)을 형성한다.First, the p-
p-GaN층(120)의 p형 도펀트로서는 Be, Mg, Ca, Zn, 또는 Cd 등을 선택할 수 있다. 삽입층(130)은 0.1~1000nm의 두께를 가지며, 니켈산화물(NiO1-x), 망간산화물(MnO1-x), 철산화물(FeO3/2(1-x)), 코발트산화물(CoO1-x), 크롬산화물(CrO
3/2(1-x)), 구리산화물(CuO1-x), 주석산화물(SnO1-x), 은산화물(AgO1-x), 구리알루미늄산화물(CuAlO2(1-x)), 및 팔라듐산화물(PdO1-x)으로 이루어진 금속 산화물군으로부터 선택된 적어도 어느 하나를 포함하여 이루어지는 것이 바람직하다. 여기서, 0 < x < 1 이다. 특히, 니켈 산화물의 경우가 바람직하다. 삽입층(130)을 적층하기 이전에 염산, 인산, 수산화칼륨, 또는 왕수로 p-GaN층(120) 표면을 처리하면 더 좋다. As the p-type dopant of the p-
다음에, 삽입층(130) 상에 0.1~1000nm 두께의 아연 산화물층(140)을 형성한다. 여기서, 아연 산화물층(140)은 인듐 산화물(In2O3), 주석 산화물(SnO), 갈륨 산화물(GaO), 및 알루미늄 산화물(Al2O3)로 이루어진 군으로부터 선택된 적어도 어느 하나를 불순물로서 포함하는 것이 바람직하며, 특히 인듐 산화물의 경우가 바람직하다. Next, a
이어서, p-GaN층(120)과 그 위에 적층된 층들 사이에 오믹접촉이 이루어지도 록 상기 결과물을 100~1200℃의 온도범위에서 열처리를 행한다. 이 때의 열처리는 1초 내지 3시간 동안 행해질 수 있으며, 열처리 분위기는 질소 및 산소로 이루어진 군으로부터 선택된 적어도 어느 하나를 포함하는 분위기인 것이 바람직하다. Subsequently, the resultant is heat-treated in a temperature range of 100 to 1200 ° C. such that ohmic contact is made between the p-
도 2의 그래프 320은 오믹접촉을 위한 열처리가 행해진 니켈산화물/아연산화물 오믹접촉계에 대한 전류-전압 그래프이며, 그래프 310은 오믹접촉을 위한 열처리가 행해진 니켈금속/아연산화물 전극에 대한 것이다. 그래프 320의 경우가 낮은 접촉저항을 가짐을 알 수 있다.
도 3(a)는 오믹접촉을 위한 열처리가 행해진 니켈금속/아연산화물 전극에 대한 대한 깊이에 따른 원소 분포도이며, 도3(b)는 오믹접촉을 위한 열처리가 행해진 니켈산화물/아연산화물 전극에 대한 깊이에 따른 원소 분포도이다. 도 3을 참조하면, 니켈금속을 삽입층으로 사용하는 경우에는 p-GaN과의 계면에 니켈이 금속으로서 존재하지만, 니켈산화물을 삽입층으로 사용하는 경우에는 p-GaN와의 계면과 아연산화물층 내에 니켈이 산화물 형태로 존재함을 알 수 있다. 따라서, 니켈산화물을 삽입층으로 이용하는 경우에는 p형 반도체인 니켈산화물의 존재로 인하여 p-GaN 내에 더 많은 홀이 공급되어 바람직하게 된다. FIG. 3 (a) is an element distribution diagram according to the depth of the nickel metal / zinc oxide electrode subjected to the heat treatment for ohmic contact, and FIG. 3 (b) is the nickel oxide / zinc oxide electrode subjected to the heat treatment for ohmic contact. Element distribution according to depth. Referring to FIG. 3, when nickel metal is used as an insertion layer, nickel exists as a metal at an interface with p-GaN, but when nickel oxide is used as an insertion layer, an interface with p-GaN and a zinc oxide layer are used. It can be seen that nickel is present in oxide form. Therefore, when nickel oxide is used as the intercalation layer, more holes are supplied in p-GaN due to the presence of nickel oxide, which is a p-type semiconductor.
상술한 바와 같이 오믹접촉 투명전극층으로서 아연산화물층을 사용하면, 아연산화물의 우수한 열적 안정성 및 투광성으로 인해서 우수한 광방출효율을 갖는 발광소자를 제조할 수 있으며, 발광소자의 고온 열처리에 의한 특성 저하를 방지할 수 있게 된다.As described above, when the zinc oxide layer is used as the ohmic contact transparent electrode layer, a light emitting device having excellent light emission efficiency can be manufactured due to the excellent thermal stability and light transmittance of the zinc oxide. It can be prevented.
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