KR20040036381A - METHOD FOR MANUFACTURING GaN SUBSTRATE - Google Patents
METHOD FOR MANUFACTURING GaN SUBSTRATE Download PDFInfo
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- KR20040036381A KR20040036381A KR1020020065387A KR20020065387A KR20040036381A KR 20040036381 A KR20040036381 A KR 20040036381A KR 1020020065387 A KR1020020065387 A KR 1020020065387A KR 20020065387 A KR20020065387 A KR 20020065387A KR 20040036381 A KR20040036381 A KR 20040036381A
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- gallium nitride
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- gan layer
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- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 45
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000007547 defect Effects 0.000 claims abstract description 14
- 238000001039 wet etching Methods 0.000 claims abstract description 8
- 229910052594 sapphire Inorganic materials 0.000 claims abstract description 5
- 239000010980 sapphire Substances 0.000 claims abstract description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 4
- 239000011259 mixed solution Substances 0.000 claims abstract description 4
- 238000007517 polishing process Methods 0.000 claims abstract 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract 2
- 229910002601 GaN Inorganic materials 0.000 claims description 57
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 4
- 238000005530 etching Methods 0.000 claims description 3
- 125000005842 heteroatom Chemical group 0.000 abstract 3
- 235000011007 phosphoric acid Nutrition 0.000 abstract 2
- 235000011149 sulphuric acid Nutrition 0.000 abstract 2
- 235000011118 potassium hydroxide Nutrition 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 4
- -1 nitride compound Chemical class 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 239000010409 thin film Substances 0.000 description 3
- 101000661807 Homo sapiens Suppressor of tumorigenicity 14 protein Proteins 0.000 description 2
- 101000661808 Mus musculus Suppressor of tumorigenicity 14 protein homolog Proteins 0.000 description 2
- 102100037942 Suppressor of tumorigenicity 14 protein Human genes 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 208000012868 Overgrowth Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000000407 epitaxy Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 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
- H01L33/005—Processes
- H01L33/0062—Processes for devices with an active region comprising only III-V compounds
- H01L33/0075—Processes for devices with an active region comprising only III-V compounds comprising nitride compounds
-
- 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
- H01L33/0004—Devices characterised by their operation
- H01L33/002—Devices characterised by their operation having heterojunctions or graded gap
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Semiconductor Lasers (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
본 발명은 질화갈륨 기판 제조 방법에 관한 것으로, 보다 상세하게는 이종 기판에 1차로 질화갈륨층을 성장시키고, 이 질화갈륨층을 습식식각한 후, 2차로 질화갈륨층을 성장시킴으로써, 전위나 크랙 등의 결함밀도가 상당히 감소된 고품질의 질화갈륨 기판을 제조할 수 있는 질화갈륨 기판 제조 방법에 관한 것이다.The present invention relates to a method of manufacturing a gallium nitride substrate, and more particularly, a gallium nitride layer is first grown on a dissimilar substrate, the gallium nitride layer is wet etched, and then a gallium nitride layer is grown secondly to thereby dislocation or crack. The present invention relates to a gallium nitride substrate manufacturing method capable of producing a high quality gallium nitride substrate having significantly reduced defect density.
일반적으로 III-V족 질화물 화합물 반도체는 자외선(Ultraviolet)에서 적색에 이르는 발광다이오드(Light Emitting Diode, LED), 레이저 다이오드, 광검출기 등의 광소자와 넓은 밴드갭(Bandgap)을 이용한 고온 및 고출력 전자 소자 등에 이용되고 있다.In general, group III-V nitride compound semiconductors are high-temperature and high-power electronics using optical devices such as light emitting diodes (LEDs), laser diodes, and photodetectors ranging from ultraviolet to red, and wide bandgaps. It is used for an element.
그러한 소자들은 III-V족 질화물 화합물 반도체의 단결정 박막 즉, 에피 박막층으로 구성되는데, 우수한 에피 박막을 얻기 위해서는 결함이 적은 동종의 단결정 물질 기판으로 제조가 되어야 한다.Such devices are composed of a single crystal thin film of an III-V nitride compound semiconductor, that is, an epi thin film layer. In order to obtain an excellent epi thin film, it must be manufactured with a homogeneous single crystal material substrate having few defects.
그러나 아직까지 질화갈륨(GaN)의 단결정 성장이 어려워 2인치 이상의 대면적 단결정 기판을 제조하기가 어려운 실정이다.However, gallium nitride (GaN) single crystal growth is still difficult to manufacture a large area single crystal substrate of more than 2 inches.
따라서, 현재까지 질화물 화합물 반도체를 이용한 소자는 대부분 사파이어나 실리콘카바이드(SiC) 등의 이종 기판 위에 성장되고 있다.Therefore, until now, devices using nitride compound semiconductors have been mostly grown on dissimilar substrates such as sapphire and silicon carbide (SiC).
그러나, 이종기판은 질화물 화합물 반도체와의 격자 상수 및 열팽창 계수의 차이가 커서, 이종기판에 성장되는 질화갈륨 에피 박막 내부에 전위(Dislocation), 크랙(Crack) 등의 결함이 상당수 존재하게 된다.However, the dissimilar substrate has a large difference in lattice constant and thermal expansion coefficient with the nitride compound semiconductor, and a large number of defects such as dislocations and cracks exist in the gallium nitride epitaxial film grown on the dissimilar substrate.
이런 결함들을 갖는 기판으로 소자를 제조할 경우, 결함들이 누설전류의 통로가 되거나, 비발광 부위로 작용하여 소자의 성능을 저하시키게 된다.When the device is manufactured from a substrate having such defects, the defects become a passage of leakage current or act as a non-light emitting portion, thereby degrading the performance of the device.
도 1은 종래기술에 따라 이종 기판의 상부에 성장된 질화갈륨층의 모식 단면도로써, 사파이어나 실리콘카바이드(SiC) 등의 이종 기판(10)의 상부에 성장된 질화갈륨층에는 이종 기판(10)과 성장되는 질화갈륨의 격자 상수와 열팽창 계수의 차이로 인하여 전위(12)와 같은 결함이 형성된다.1 is a schematic cross-sectional view of a gallium nitride layer grown on top of a heterogeneous substrate according to the related art, and the heterogeneous substrate 10 is formed on a gallium nitride layer grown on a heterogeneous substrate 10 such as sapphire or silicon carbide (SiC). Defects such as dislocations 12 are formed due to the difference between the lattice constant and the coefficient of thermal expansion of gallium nitride overgrown.
전술된 문제점을 해결하기 위하여, 최근까지 선택영역 에피성장(Selective Area Epitaxy Growth)법, 즉, 측면 에피성장(Lateral Epitaxial Overgrowth)법으로 질화갈륨 기판을 제조하고 있고, 다른 한편으로는 더욱 특성이 우수한 질화갈륨 기판을 개발하려는 노력이 계속되고 있다.In order to solve the above-mentioned problem, until recently, gallium nitride substrates have been manufactured by the Selective Area Epitaxy Growth method, that is, the Lateral Epitaxial Overgrowth method, and on the other hand, the characteristics are more excellent. Efforts to develop gallium nitride substrates continue.
한편, 현재의 프리 스탠팅(Free-Standing) 질화갈륨 기판을 형성하는 방법은 이종기판에 질화갈륨 후막을 성장 후, 레이저 리프트 오프(Laser Lift-Off)방법으로 질화갈륨을 이종기판에서 분리하거나 기계적으로 연마를 해서 이종기판을 갈아내어 분리하는 방법이 이용되고 있다.On the other hand, the current method of forming a free-standing gallium nitride substrate is to grow a gallium nitride thick film on a dissimilar substrate, and then to separate the gallium nitride from the dissimilar substrate by laser lift-off method or mechanical A method of grinding and separating heterogeneous substrates by polishing with a metal is used.
그러므로, 질화갈륨 성장 시 발생되는 격자 상수 및 열팽창 계수의 차이에 의한 결함은 프리스탠딩을 수행한 후에도 질화갈륨 기판에 그대로 잔존하여, 이를 이용하여 제조된 소자에 악영향을 인가하게 된다.Therefore, defects due to differences in lattice constants and thermal expansion coefficients generated during gallium nitride growth remain on the gallium nitride substrate even after freestanding, thereby adversely affecting devices manufactured using the same.
따라서, 결함밀도가 감소되는 질화갈륨 기판의 제조방법이 요구되는 것이다.Therefore, there is a need for a method of manufacturing a gallium nitride substrate in which defect density is reduced.
이에 본 발명은 상기한 바와 같은 문제점을 해결하기 위하여 안출된 것으로,Accordingly, the present invention has been made to solve the above problems,
본 발명은 이종 기판에 1차로 질화갈륨층을 성장시키고, 이 질화갈륨층을 습식식각한 후, 2차로 질화갈륨층을 성장시킴으로써, 전위나 크랙 등의 결함밀도가 상당히 감소된 고품질의 질화갈륨 기판을 제조할 수 있는 질화갈륨 기판의 제조방법을 제공하는 데 그 목적이 있다.The present invention is a high quality gallium nitride substrate in which a gallium nitride layer is first grown on a dissimilar substrate, a wet etching of the gallium nitride layer, and a second gallium nitride layer is grown, thereby significantly reducing defect densities such as dislocations and cracks. It is an object of the present invention to provide a method for producing a gallium nitride substrate which can be prepared.
상기한 본 발명의 목적을 달성하기 위한 바람직한 양태(樣態)는, 이종 기판의 상부에 질화갈륨층을 성장시키는 제 1 단계와;A preferred aspect for achieving the above object of the present invention comprises a first step of growing a gallium nitride layer on top of a heterogeneous substrate;
상기 질화갈륨층의 일부를 습식식각하여 상기 질화갈륨층의 표면의 결함을 제거하는 제 2 단계와;A second step of wet etching a part of the gallium nitride layer to remove defects on the surface of the gallium nitride layer;
상기 식각된 질화갈륨층의 상부에 질화갈륨층을 재성장시키는 제 3 단계로이루어진 것을 특징으로 하는 질화갈륨 기판 제조 방법이 제공된다.A gallium nitride substrate manufacturing method is provided, which comprises a third step of regrowing a gallium nitride layer on the etched gallium nitride layer.
도 1은 종래기술에 따라 이종 기판의 상부에 성장된 질화갈륨층의 모식 단면도이다.1 is a schematic cross-sectional view of a gallium nitride layer grown on top of a heterogeneous substrate according to the prior art.
도 2a 내지 2c는 본 발명에 따른 질화갈륨 기판 제조 공정 모식 단면도이다.2A to 2C are schematic cross-sectional views of a gallium nitride substrate manufacturing process according to the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
10 : 이종기판 11,14 : 질화갈륨층10: dissimilar substrate 11,14: gallium nitride layer
12 : 전위(Dislocation) 13 : 식각된 버퍼층12: dislocation 13: etched buffer layer
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.
도 2a 내지 2c는 본 발명에 따른 질화갈륨 기판 제조 공정 모식 단면도로써, 먼저, 사파이어나 실리콘카바이드(SiC) 등의 이종 기판(10)의 상부에 질화갈륨층(11)을 성장시킨다.(도 2a)2A to 2C are schematic cross-sectional views of a gallium nitride substrate manufacturing process according to the present invention. First, a gallium nitride layer 11 is grown on a dissimilar substrate 10 such as sapphire or silicon carbide (SiC). )
그 후, 상기 질화갈륨층(11)의 일부를 습식식각하여 식각된 버퍼층(13)을 형성한다.(도 2b)Thereafter, a part of the gallium nitride layer 11 is wet-etched to form an etched buffer layer 13 (FIG. 2B).
여기서, 상기 습식식각은 수산화칼륨(KOH), 황산(H2SO4)과 인산(H3PO4) 중 어느 하나의 용액 또는 황산과 인산의 혼합용액을 이용하여 식각하는 것이 바람직하다.Here, the wet etching may be etched using any one solution of potassium hydroxide (KOH), sulfuric acid (H 2 SO 4 ) and phosphoric acid (H 3 PO 4 ) or a mixed solution of sulfuric acid and phosphoric acid.
이 때, 상기 질화갈륨층(11)은 250℃ ~ 400 ℃ 정도의 수산화칼륨(KOH)용액에 1~10분 정도 식각을 한다.At this time, the gallium nitride layer 11 is etched in potassium hydroxide (KOH) solution of about 250 ℃ ~ 400 ℃ for about 1 to 10 minutes.
또는, 200℃ ~ 350 ℃ 정도의 황산(H2SO4) 또는 인산(H3PO4)용액 이나 황산과 인산의 혼합용액에 1 ~ 30분 정도 식각하여 질화갈륨층(11) 표면에 형성된 결함을 식각하여 제거한다.Alternatively, defects formed on the surface of the gallium nitride layer 11 by etching in sulfuric acid (H 2 SO 4 ) or phosphoric acid (H 3 PO 4 ) solution of 200 ° C. to 350 ° C. or a mixed solution of sulfuric acid and phosphoric acid for about 1 to 30 minutes. Is removed by etching.
마지막으로, 상기 식각된 버퍼층(13)의 상부에 질화갈륨층(14)을 성장시킨다.(도 2c)Finally, the gallium nitride layer 14 is grown on the etched buffer layer 13 (FIG. 2C).
여기서, 상기 식각된 버퍼층(13)의 상부에 성장되는 질화갈륨층(14)은 상기 버퍼층(13)과 동종물질이기 때문에, 크랙 및 전위 밀도가 감소한다.Here, since the gallium nitride layer 14 grown on the etched buffer layer 13 is the same material as the buffer layer 13, the crack and dislocation density decrease.
더불어, 전술된 도 2a 내지 2c 공정을 수행하여 상기 식각된 버퍼층(13)의 상부에 질화갈륨층(14)을 성장시킨 후, 레이저 리프트 오프(Laser Lift-Off) 공정을 수행하여 이종기판(10)에서 질화갈륨층을 분리한다.2A to 2C, the gallium nitride layer 14 is grown on the etched buffer layer 13, and then a laser lift-off process is performed to dissimilar the substrate 10. The gallium nitride layer is separated from
또는, 기계적으로 연마해서 이종기판(10)을 갈아냄으로써, 프리스탠딩 질화갈륨 기판을 제조할 수 있다.Alternatively, the freestanding gallium nitride substrate can be manufactured by grinding the dissimilar substrate 10 by mechanical polishing.
따라서, 본 발명은 질화갈륨으로 이루어진 식각된 버퍼층(13)의 상부에 질화갈륨을 재성장시킴으로써, 재성장되는 질화갈륨층에는 이종 기판(10)과 성장되는 질화갈륨의 격자 상수와 열팽창 계수의 차이로 인하여 발생되는 전위(dislocation)와 크랙(Crack) 등의 결함을 제거할 수 있다.Therefore, the present invention re-grows gallium nitride on the etched buffer layer 13 made of gallium nitride, so that the regrown gallium nitride layer has a difference between lattice constants and thermal expansion coefficients of the heterogeneous substrate 10 and the grown gallium nitride. Defects such as dislocations and cracks generated can be eliminated.
이상에서 상세히 설명한 바와 같이 본 발명은 이종 기판에 1차로 질화갈륨층을 성장시키고, 이 질화갈륨층을 습식식각한 후, 2차로 질화갈륨층을 성장시킴으로써, 고품질의 질화갈륨 기판을 제조할 수 있는 효과가 발생한다.As described in detail above, the present invention can produce a high quality gallium nitride substrate by first growing a gallium nitride layer on a dissimilar substrate, wet etching the gallium nitride layer, and growing a gallium nitride layer secondarily. Effect occurs.
더불어, 이러한 방법으로 만들어진 기판을 이용해 우수한 광소자 및 전자소자를 만들 수 있는 효과가 발생된다.In addition, there is an effect that can make excellent optical devices and electronic devices using the substrate made in this way.
본 발명은 구체적인 예에 대해서만 상세히 설명되었지만 본 발명의 기술사상 범위 내에서 다양한 변형 및 수정이 가능함은 당업자에게 있어서 명백한 것이며, 이러한 변형 및 수정이 첨부된 특허청구범위에 속함은 당연한 것이다.Although the invention has been described in detail only with respect to specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100735488B1 (en) * | 2006-02-03 | 2007-07-04 | 삼성전기주식회사 | Method for forming the gan type led device |
| KR100775137B1 (en) * | 2006-07-26 | 2007-11-08 | 삼성전기주식회사 | Method of growing nitride semiconductor layer |
| KR101155061B1 (en) * | 2006-03-22 | 2012-06-11 | 삼성코닝정밀소재 주식회사 | Nitride semiconductor wafer and preparation thereof |
| KR101890520B1 (en) * | 2017-02-15 | 2018-08-21 | 한양대학교 산학협력단 | Methode for manufacturing gallium nitride substrate using core-shell nanoparticle |
| CN112820626A (en) * | 2020-12-30 | 2021-05-18 | 中国科学院长春光学精密机械与物理研究所 | Epitaxial growth method of nitride semiconductor material |
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| JP2001039800A (en) * | 1999-05-21 | 2001-02-13 | Nichia Chem Ind Ltd | Growing method of nitride semiconductor and nitride semiconductor element |
| JP2001122693A (en) * | 1999-10-22 | 2001-05-08 | Nec Corp | Ground substrate for crystal growth and method of producing substrate using the same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100735488B1 (en) * | 2006-02-03 | 2007-07-04 | 삼성전기주식회사 | Method for forming the gan type led device |
| KR101155061B1 (en) * | 2006-03-22 | 2012-06-11 | 삼성코닝정밀소재 주식회사 | Nitride semiconductor wafer and preparation thereof |
| KR100775137B1 (en) * | 2006-07-26 | 2007-11-08 | 삼성전기주식회사 | Method of growing nitride semiconductor layer |
| KR101890520B1 (en) * | 2017-02-15 | 2018-08-21 | 한양대학교 산학협력단 | Methode for manufacturing gallium nitride substrate using core-shell nanoparticle |
| CN112820626A (en) * | 2020-12-30 | 2021-05-18 | 中国科学院长春光学精密机械与物理研究所 | Epitaxial growth method of nitride semiconductor material |
| CN112820626B (en) * | 2020-12-30 | 2023-06-30 | 中国科学院长春光学精密机械与物理研究所 | Epitaxial growth method of nitride semiconductor material |
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