WO2013157842A1 - 나노 급 패턴이 형성된 고효율 질화물계 발광다이오드용 기판의 제조방법 - Google Patents
나노 급 패턴이 형성된 고효율 질화물계 발광다이오드용 기판의 제조방법 Download PDFInfo
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- WO2013157842A1 WO2013157842A1 PCT/KR2013/003233 KR2013003233W WO2013157842A1 WO 2013157842 A1 WO2013157842 A1 WO 2013157842A1 KR 2013003233 W KR2013003233 W KR 2013003233W WO 2013157842 A1 WO2013157842 A1 WO 2013157842A1
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- 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
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- 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
- H01L33/20—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 particular shape, e.g. curved or truncated substrate
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Definitions
- the present invention economically produces a nano-class pattern on a substrate of a light emitting diode comprising a convex portion including any one selected from the group consisting of SiO 2, Si 3 N 4, and combinations thereof using nano printing or nano imprint process, and using the same
- a nanoscale pattern is efficiently formed on a substrate of a light emitting diode such as sapphire single crystal, gallium nitride and the like having few crystal defects are formed thereon to significantly increase the performance of the light emitting diode.
- Light emitting diodes have long life, low power consumption and eco-friendly advantages over conventional lighting devices such as fluorescent lamps and incandescent lamps and are attracting attention as future light sources for lighting.
- Current light emitting diodes are compared to conventional lighting devices such as fluorescent lamps and incandescent lamps. It has long life, low power consumption and eco-friendly advantages, so it is attracting attention as a future light source for lighting and is currently used as a light source in various fields.
- nitride-based light emitting diodes having a wide bandgap can emit light in the green, blue, and near-ultraviolet region, so that their application fields, such as LCD and mobile phone backlights, automotive lighting, traffic signals, and general lighting, are greatly expanded. There is a trend. However, nitride-based light emitting diodes are not sufficiently improved to meet these demands.
- the performance of the light emitting diode is largely determined by the internal quantum efficiency depending on how many photons are injected and the light extraction efficiency depending on how much photons can be emitted to the outside of the light emitting diode device.
- nitride-based light emitting diodes have greatly improved internal quantum efficiency due to the development of epitaxial growth technology, but light extraction efficiency is very low.
- MQW region multi quantum well region
- an active layer light emitting layer
- sapphire substrate sapphire substrate
- the light extraction efficiency can be effectively improved due to the same light reflection effect.
- PSS the technology or light extraction efficiency, which was originally developed to increase internal quantum efficiency by reducing treading dislocation density due to lattice mismatch between sapphire substrate and GaN epilayer, was also improved.
- PSS is manufactured mainly through photolithography process and dry and wet etching process, and the specification of pattern is mostly in the order of several micro level.
- the improvement of the light extraction efficiency of the light emitting diode by the diffuse reflection of light varies greatly depending on the size, shape, period, and the like of the pattern.
- the light extraction enhancement is known to be greatly increased. Therefore, in order to improve the efficiency of the light emitting device, it is necessary to reduce the diameter and period of the micron-class pattern of the conventionally commercially available PSS to nano-class, and also optimize the shape of the pattern.
- Photolithography which is the patterning technology used for PSS fabrication, is very expensive and the manufacturing cost is too low and economic efficiency is very low to apply nano pattern. Improvement is hard to expect. Therefore, in order to further improve the efficiency of the light emitting diode, a patterning technique for economically manufacturing nanoscale patterns to replace expensive photolithography is needed.
- a process for coating a gallium nitride film with fewer lattice defects on a sapphire substrate or the like is required. This is because the total reflection in the substrate can be reduced and the luminous efficiency can be improved.
- a method of manufacturing a substrate for a light emitting diode comprising a according to an embodiment of the present invention is a convex comprising any one selected from the group consisting of SiO2, Si3N4 and combinations thereof on one surface of the substrate Convex portion forming step of forming the portion by nano printing or nano imprinting method, and crystallization step of crystallizing the convex portion of the nano-pattern by heat-treating the substrate including the convex portion.
- the convex forming step is a first step of forming a pattern material coating layer with any one solution selected from the group consisting of a precursor of SiO 2, a precursor of Si 3 N 4, and a combination thereof, and placing a nano mold on the pattern material coating layer. It may include a nano-imprinting method comprising a second step of forming the convex portion by pressing and pressing.
- the convex forming step is a third step of forming a pattern material coating layer on one surface of the nano-mold, using any one solution selected from the group consisting of a precursor of SiO 2, a precursor of Si 3 N 4, and a combination thereof, and the pattern material
- the nanoprinting method may include a fourth step of forming the convex portion by placing and pressing the nano mold having the coating layer formed on the substrate.
- a curing step may be further included between the third step and the fourth step.
- the substrate may be one of improving the adhesion to the convex portion by UV ozone treatment, piranha solution (piranha) solution treatment, O 2 treatment, or plasma treatment on one surface thereof.
- the nanoprinting or nanoimprinting may be a pressurization to 1 to 30 bar (100) at 100 to 250 °C.
- the nanopattern may include a bottom part and a convex part, and the bottom diameter of the convex part may be 0.1 to 3 times the emission wavelength of the light emitting diode.
- the nano-pattern may be formed by alternately forming a bottom portion and a convex portion alternately, and a period in which the first convex portion and the second convex portion adjacent to the first convex portion are formed is 0.2 to 6 times the emission wavelength of the light emitting diode. .
- the nano-pattern may be one containing a hemisphere, a triangular pyramid, a square pyramid, a hexagonal pyramid, a cone and a truncated sphere.
- the substrate may be any one selected from the group consisting of a sapphire substrate, a silicon substrate, and a quartz substrate, and may be a sapphire substrate.
- a convex portion including any one selected from the group consisting of SiO 2, Si 3 N 4, and combinations thereof is formed on the substrate, and a gallium nitride film is formed thereon, whereby the seed is exposed to the sapphire substrate. It is formed at the bottom, and gallium nitride crystals can be established and lattice defects can be significantly reduced.
- the substrate may include any one selected from the group consisting of Al 2 O 3, SiC, Si, SiO 2, quartz, AlN, GaN, Si 3 N 4, and MgO.
- the light emitting diode according to another embodiment of the present invention includes a substrate and a convex portion formed on one surface of the substrate, and the convex portion is repeatedly formed in a nano pattern, and the lower diameter of the convex portion is the light emission wavelength of the light emitting diode.
- a light emitting diode substrate having a formation period of 0.1 to 3 times that of the first convex portion and a second convex portion adjacent to the first convex portion of 0.2 to 6 times the light emission wavelength of the light emitting diode. It includes a light emitting diode substrate capable of forming a.
- Nanoprint (or imprint) technology has the advantage of high production yield because it eliminates the need for expensive exposure equipment and can transfer patterns to large areas in an economical and simple process.
- patterning for light emitting diodes does not require precise alignment, it is suitable to apply a nanoprint (or imprint) process, which is a direct pattern transfer method, and can easily form a sub-micron pattern.
- a substrate for a light emitting diode comprising convex portions such as SiO 2 and Si 3 N 4 on a substrate such as sapphire can cause gallium nitride and the like formed therein to have a significantly smaller crystal defect, so that light emitted from the light emitting element The probability of scattering and total internal reflection can be significantly reduced, and the light emitting performance of the device can be significantly improved.
- the present invention can be applied to a light emitting diode having a top emitting structure, a flip-chip light emitting diode, and a vertical light emitting diode.
- FIG. 1 is a schematic view showing a method of manufacturing a light emitting diode substrate according to an embodiment of the present invention.
- FIG. 2 is a schematic view showing a method of manufacturing a light emitting diode substrate according to another embodiment of the present invention.
- FIG. 3 is a conceptual diagram illustrating an example of various nanopatterns applicable to an embodiment of the present invention.
- FIG. 4 is a conceptual diagram of a light emitting diode including a light emitting diode substrate manufactured according to an embodiment of the present invention.
- FIG. 1 is a schematic view showing a method of manufacturing a light emitting diode substrate according to an embodiment of the present invention
- Figure 2 is a schematic view showing a method of manufacturing a light emitting diode substrate according to another embodiment of the present invention
- Figure 3 It is a conceptual diagram showing an example of various nano-patterns applicable to one embodiment of the present invention
- 4 is a conceptual diagram of a light emitting diode including a light emitting diode substrate manufactured according to an embodiment of the present invention.
- Method of manufacturing a substrate for a light emitting diode is a convex portion forming step of forming a convex portion including any one selected from the group consisting of SiO2, Si3N4 and combinations thereof on one surface of the substrate, and And a crystallization step of crystallizing the convex portion of the nanopattern by heat-treating the substrate including the convex portion.
- the convex forming step is a first step of forming a pattern material coating layer with any one solution selected from the group consisting of a precursor of SiO 2, a precursor of Si 3 N 4, and a combination thereof, and placing a nano mold on the pattern material coating layer. It may include a nano-imprinting process comprising a second step of pressing and pressing to form the convex portion.
- the substrate Before forming the pattern material coating layer, the substrate may be subjected to UV ozone treatment, piranha solution treatment, O2 treatment, or plasma treatment to improve adhesion between the pattern material coating layer and the substrate for forming the convex portion. have.
- the precursor of SiO 2 or the precursor of Si 3 N 4 a mixture of silicon oxide and a polymer, or a mixture of silicon nitride and a polymer may be used, and may be applied as long as the pattern material coating layer may be formed on the substrate.
- Specific examples of the precursor of SiO 2 include, but are not limited to, HSQ (Hydrogen silsesquioxane).
- the solvent applied to the solution may be an organic solvent such as ethanol, methanol, DMF (dimethylformamide), etc., but is not limited thereto.
- the convex forming step is a third step of forming a pattern material coating layer on one surface of the nano-mold, using any one solution selected from the group consisting of a precursor of SiO 2, a precursor of Si 3 N 4, and a combination thereof, and the pattern material
- the method may include a fourth step of forming the convex portion by placing and pressing the nano mold having the coating layer formed on the substrate.
- the third step may further include curing the pattern material coating layer.
- the substrate Before forming the convex portion, the substrate may be subjected to UV ozone treatment, piranha solution treatment, O 2 treatment, or plasma treatment to improve adhesion between the pattern material coating layer formed on the nano mold and the substrate.
- the nanoprinting or nanoimprinting may be one to 30 bar pressure at 100 to 250 °C. Nano printing or nano imprinting can be effectively performed in the temperature and pressure range.
- the nano mold may transfer a nano pattern to the substrate, may be a flexible polymer replication mold, and may be made of a polymer material such as PDMS, h-PDMS, PVC, or the like.
- the nano mold may be made of a material that can effectively absorb the solvent of the solution forming the pattern material coating layer.
- the convex portion may be easily formed using the pattern material coating layer.
- the material may include any one polymer selected from the group consisting of PDMS, PVA, PDMS, and combinations thereof.
- the nano mold is made of a flexible polymer mold, a nano printing or nano imprinting process can be easily performed.
- the material of the mold is PDMS, the solvent absorption ability of the solution forming the pattern material coating layer may be improved due to high moisture permeability.
- the nano mold may be a nano-pattern in which the bottom diameter A of the convex portion formed on the substrate is 0.1 to 3 times the emission wavelength of the light emitting diode.
- the lower diameter A means the diameter of the convex cross section at the surface where the convex portion is in contact with the bottom as shown in FIG.
- the substrate may be a sapphire substrate, a silicon substrate, a quartz substrate which is utilized as an LED substrate, and preferably may be a sapphire substrate.
- the substrate may include any one selected from the group consisting of Al 2 O 3, SiC, Si, SiO 2, quartz, AlN, GaN, Si 3 N 4, and MgO.
- the substrate may be applied as long as gallium nitride or the like is formed from the bottom of the substrate to grow and form a gallium nitride film having a small lattice defect.
- An etching step may be further included between the convex forming step and the crystallization step, and the etching step may be dry etching or wet etching.
- the etching may be plasma etching.
- the etching step may remove the residue of the pattern material coating layer remaining in the convex portion forming step.
- the heat treatment may be performed at 100 to 900 ° C. in the crystallization step of crystallizing the convex portion of the nanopattern by heat treating the substrate including the convex portion.
- the nano-pattern printed or imprinted on the substrate includes a bottom portion and a convex portion, and the bottom diameter of the convex portion is 0.1 to 3 times the emission wavelength of the light emitting diode. That is, the bottom diameter of the convex portion may be 0.1 ⁇ to 3 ⁇ when the light emitting wavelength of the light emitting diode is ⁇ , and the light emitting wavelength of the light emitting diode may be applied according to the wavelength of light to be provided to the light emitting diode.
- the bottom diameter of the convex portion is within the above range, lattice bonds of gallium nitride and the like formed and formed starting from the bottom portion on the substrate may be reduced by a nano pattern, thereby reducing total internal reflection in the light emitting diode device.
- the luminous efficiency of the light emitting diode can be significantly increased.
- the nano pattern may have a bottom portion and a convex portion alternately formed, and a distance between the first convex portion and the second convex portion adjacent to the first convex portion may be 0.2 to 6 times the emission wavelength of the light emitting diode.
- the formation period B of the first convex portion and the second convex portion adjacent to the first convex portion is ⁇
- the light emission wavelength of the light emitting diode may be 0.2 ⁇ to 6 ⁇
- the pattern may be regular and repetitive. It may be formed as.
- the period of the nano-pattern is in the above range, the light emitting efficiency of the light emitting diode may be significantly increased.
- the nano-pattern may be any one selected from the group consisting of hemispherical, triangular pyramid, square pyramidal, hexagonal pyramidal, conical and truncated, and such a pattern Since the nanoprinting or imprinting is used, a pattern having a desired shape may be manufactured and applied according to a master template.
- the nanopattern is composed of a three-dimensional shape having regularity
- a GaN layer or the like formed on the substrate is formed and grown from the bottom portion, and a film having a lattice mismatch reduced by the nanopattern is formed.
- the light extraction efficiency improvement value may appear somewhat depending on the shape of the pattern, thereby improving the low light extraction efficiency due to the diffuse reflection inside the diode.
- the method of manufacturing the substrate for light emitting diodes may further include a buffer layer forming step of further forming a buffer layer including a GaN layer on the substrate on which the crystallized convex portion is formed after the crystallization step.
- the buffer layer can reduce the lattice mismatch that occurs when GaN is formed on the substrate in the general case while GaN is formed on the nano-patterned substrate, and can reduce the lattice mismatch more precisely with the nano-pattern.
- the pattern is nano-sized, can be patterned in a predetermined size and period according to the wavelength of the light emitting diode, thereby minimizing diffuse reflection to reduce the light extraction efficiency by the printing it can be improved the light extraction efficiency of the light emitting diode.
- nano-sized patterns can be precisely patterned on a substrate by applying nanoprinting or nanoimprinting, and at the same time, conventional photolithography Unlike this, the process of manufacturing a substrate for a light emitting diode and a light emitting diode including the same can be simplified by simplifying the process.
- the light emitting diode according to another embodiment of the present invention includes a light emitting diode substrate manufactured by the method of manufacturing the light emitting diode substrate.
- the light emitting diode may be formed on a substrate and one surface of the substrate, and may include a convex portion including any one selected from the group consisting of SiO 2, Si 3 N 4, and a combination thereof, wherein the convex portion is repeatedly formed in a nano pattern.
- the lower diameter of the convex portion may be 0.1 to 3 times the light emission wavelength of the light emitting diode, and the period of formation of the first convex portion and the second convex portion adjacent to the first convex portion is 0.2 to the light emission wavelength of the light emitting diode. It may be six times.
- GaN may be formed sequentially.
- the convex portion is repeatedly formed, and the lower diameter of the convex portion may be 0.1 to 3 times the emission wavelength of the light emitting diode.
- the formation period of the first convex portion and the second convex portion adjacent to the first convex portion may be 0.2 to 6 times the emission wavelength of the light emitting diode.
- the n-GaN layer further includes a buffer layer made of GaN at the bottom thereof, and the buffer layer may improve light extraction efficiency by reducing lattice mismatch.
- the light emitting diode including the light emitting diode substrate may be warped by lowering the residual stress after forming the GaN film including the buffer layer even if the size of the substrate is widened by the regular nanopattern structure and the GaN buffer layer formed thereon. Can be prevented.
- the light emitting diode may be a light emitting diode having a top emitting structure, may be included in a light emitting diode having a flip-chip structure, and may be applied to a light emitting diode having a vertical structure.
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Abstract
Description
Claims (4)
- 기판의 일면(一面)에 SiO2, Si3N4 및 이들의 조합으로 이루어진 군에서 선택된 어느 하나를 포함하는 볼록부를 형성하는 볼록부 형성단계, 그리고상기 볼록부를 포함하는 기판을 열처리하여 나노 패턴의 볼록부를 결정화하는 결정화단계를 포함하되,상기 볼록부 형성단계에서, 상기 기판은 UV 오존처리, 피라나 용액 (piranha) 용액처리, O2 처리, 또는 플라즈마 처리를 하여 상기 볼록부와의 접착력을 향상시킨 것이고,상기 나노 패턴은 바닥부와 볼록부를 포함하고, 상기 볼록부의 하단직경은 발광다이오드의 발광 파장의 0.1 내지 3배인 것이며,상기 나노 패턴은 바닥부와 볼록부가 교대로 반복적으로 형성되어 있고, 제1볼록부와 상기 제1볼록부에 이웃하는 제2볼록부의 형성 주기가 발광다이오드의 발광 파장의 0.2 내지 6배인 것이고,상기 나노 패턴은 반구형, 삼각뿔형, 사각뿔형, 육각뿔형, 원뿔형 및 잘린구형으로 이루어진 군에서 선택된 어느 하나를 반복적으로 포함하는 것인 나노 급 패턴이 형성된 고효율 질화물계 발광다이오드용 기판의 제조방법
- 제1항에 있어서,상기 볼록부 형성단계는 상기 기판에 SiO2의 전구체, Si3N4의 전구체 및 이들의 조합으로 이루어진 군에서 선택된 어느 하나의 용액으로 패턴물질코팅층을 형성하는 제1단계, 그리고상기 패턴물질코팅층에 나노 몰드를 위치시키고 가압하여 상기 볼록부를 형성하는 제2단계를 포함하는 나노 임프린팅 방법을 포함하는 것인 나노 급 패턴이 형성된 고효율 질화물계 발광다이오드용 기판의 제조방법
- 제1항에 있어서,상기 볼록부 형성단계는 나노 몰드의 일면(一面)에, SiO2의 전구체, Si3N4의 전구체 및 이들의 조합으로 이루어진 군에서 선택된 어느 하나의 용액으로 패턴물질코팅층을 형성하는 제3단계, 그리고상기 패턴물질코팅층이 형성된 나노 몰드를 상기 기판에 위치시키고 가압하여 상기 볼록부를 형성하는 제4단계를 포함하는 나노 프린팅 방법을 포함하는 것인 나노 급 패턴이 형성된 고효율 질화물계 발광다이오드용 기판의 제조방법
- 제2항 또는 제3항에서,상기 나노 프린팅 또는 나노 임프린팅은 100 내지 250 ℃에서 1 내지 30 바(bar)로 가압이 이루어지는 것인 나노 급 패턴이 형성된 고효율 질화물계 발광다이오드용 기판의 제조방법.
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US14/394,739 US9246050B2 (en) | 2012-04-19 | 2013-04-17 | Method for fabricating nano-patterned substrate for high-efficiency nitride-based light-emitting diode |
CN201380020378.1A CN104221168B (zh) | 2012-04-19 | 2013-04-17 | 制造供高效率氮化物发光二极体用的纳米图案化基材的方法 |
JP2015506894A JP5897764B2 (ja) | 2012-04-19 | 2013-04-17 | ナノレベルのパターンが形成された高効率窒化物系発光ダイオード用基板の製造方法(MethodForFabricatingNanoPatternedSubstrateForHighEfficiencyNitridebasedLightEmittingDiode) |
EP13778786.7A EP2840619A4 (en) | 2012-04-19 | 2013-04-17 | METHOD FOR MANUFACTURING NANOMOTIVE SUBSTRATE FOR HIGH-PERFORMANCE, NITRIDE-BASED LIGHT EMITTING DIODE |
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KR1020120040785A KR101233063B1 (ko) | 2012-04-19 | 2012-04-19 | 나노 급 패턴이 형성된 고효율 질화물계 발광다이오드용 기판의 제조방법 |
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EP3298181A1 (de) * | 2015-05-21 | 2018-03-28 | EV Group E. Thallner GmbH | Verfahren zur aufbringung einer überwuchsschicht auf eine keimschicht |
KR101720895B1 (ko) | 2016-01-20 | 2017-03-29 | 경희대학교 산학협력단 | 나노임프린팅 방법 |
KR101913903B1 (ko) * | 2016-04-29 | 2018-10-31 | (주)휴넷플러스 | 광학용 기판의 제조방법 |
CN108511572A (zh) * | 2017-02-23 | 2018-09-07 | 海迪科(南通)光电科技有限公司 | 一种具有光子晶体结构的发光二极管 |
DE102017107432B4 (de) * | 2017-04-06 | 2022-01-13 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | Verfahren zur Herstellung eines Auskoppelelements für ein optoelektronisches Bauelement und optoelektronisches Bauelement |
US10804429B2 (en) | 2017-12-22 | 2020-10-13 | Lumileds Llc | III-nitride multi-wavelength LED for visible light communication |
CN109166952B (zh) * | 2018-09-04 | 2021-06-29 | 孙逊运 | 一种图形化蓝宝石衬底及其制备方法 |
US11264530B2 (en) * | 2019-12-19 | 2022-03-01 | Lumileds Llc | Light emitting diode (LED) devices with nucleation layer |
US11211527B2 (en) | 2019-12-19 | 2021-12-28 | Lumileds Llc | Light emitting diode (LED) devices with high density textures |
CN112993098B (zh) * | 2021-02-05 | 2022-07-19 | 福建晶安光电有限公司 | 一种图形化衬底、发光二极管及其制作方法 |
CN113097357B (zh) * | 2021-03-25 | 2022-08-30 | 福建晶安光电有限公司 | 发光二极管的图形化衬底、发光二极管及其制备方法 |
CN113280840A (zh) * | 2021-05-13 | 2021-08-20 | 桂林电子科技大学 | 基于金纳米四棱锥结构偏振相关的等离子光学传感器 |
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JP2015515146A (ja) | 2015-05-21 |
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CN104221168A (zh) | 2014-12-17 |
US20150093847A1 (en) | 2015-04-02 |
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