WO2023157992A1 - 금속 나노입자가 적용된 나노홀을 포함하는 발광소자 및 이의 제조 방법 - Google Patents
금속 나노입자가 적용된 나노홀을 포함하는 발광소자 및 이의 제조 방법 Download PDFInfo
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- H—ELECTRICITY
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- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/819—Bodies characterised by their shape, e.g. curved or truncated substrates
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- H—ELECTRICITY
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- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/819—Bodies characterised by their shape, e.g. curved or truncated substrates
- H10H20/821—Bodies characterised by their shape, e.g. curved or truncated substrates of the light-emitting regions, e.g. non-planar junctions
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/01—Manufacture or treatment
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/01—Manufacture or treatment
- H10H20/011—Manufacture or treatment of bodies, e.g. forming semiconductor layers
- H10H20/013—Manufacture or treatment of bodies, e.g. forming semiconductor layers having light-emitting regions comprising only Group III-V materials
- H10H20/0133—Manufacture or treatment of bodies, e.g. forming semiconductor layers having light-emitting regions comprising only Group III-V materials with a substrate not being Group III-V materials
- H10H20/01335—Manufacture or treatment of bodies, e.g. forming semiconductor layers having light-emitting regions comprising only Group III-V materials with a substrate not being Group III-V materials the light-emitting regions comprising nitride materials
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/816—Bodies having carrier transport control structures, e.g. highly-doped semiconductor layers or current-blocking structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
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- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/01—Manufacture or treatment
- H10H20/011—Manufacture or treatment of bodies, e.g. forming semiconductor layers
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- H—ELECTRICITY
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- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/822—Materials of the light-emitting regions
- H10H20/824—Materials of the light-emitting regions comprising only Group III-V materials, e.g. GaP
- H10H20/825—Materials of the light-emitting regions comprising only Group III-V materials, e.g. GaP containing nitrogen, e.g. GaN
Definitions
- the present invention relates to a light emitting device to which nanoparticles are applied, and more particularly, to a method of manufacturing a light emitting device including nanoholes to which metal nanoparticles are applied and a light emitting device including nanoholes to which metal nanoparticles are applied.
- the plasmonic effect is a phenomenon in which free electrons in a metal oscillate collectively by external light, and corresponds to the photo-electronic effect that appears in a metal.
- This plasmonic effect is caused by a resonance phenomenon in which most of the light energy from incident light of a specific wavelength is transferred to free electrons.
- Such an electric field can be generated when light energy is converted by surface plasmons and accumulated on the surface of metal nanoparticles.
- the generation of an electric field may mean that light control is possible in a region smaller than the diffraction limit of light.
- Metal nanoparticles have a strong and characteristic interaction with electromagnetic waves, such as surface plasmon resonance, and thereby amplify and control the light absorption band, so they can be used in various fields such as fluorescence spectroscopy, various types of sensors, and optoelectronic devices application is expected.
- the light emitting device has a problem in that the process step of semi-permanently coating the LED with metal nanoparticles is complicated, and there is a limitation in increasing the surface plasmon effect by the metal nanoparticles.
- One object of the present invention is to provide a light emitting device including nanoholes coated with nanoparticles and formed to a depth penetrating an active layer.
- Another object of the present invention is to provide a light emitting device that maximizes the effect of surface plasmon resonance by nanoparticles.
- Another object of the present invention is to provide a method for manufacturing a light emitting device including the nanoholes.
- a light emitting device including nanoholes includes a first conductivity type semiconductor layer, an active layer formed on the first conductivity type semiconductor layer, and a light emitting device formed on the active layer. It may include a second conductivity-type semiconductor layer and nanoholes coated with nanoparticles causing surface plasmon resonance. The nanoholes may be formed to a depth penetrating the second conductivity-type semiconductor layer and the active layer.
- the nano-holes are formed by forming an ohmic metal on the second conductivity-type semiconductor layer, vertically etching the ohmic metal, the second conductivity-type semiconductor layer, and the active layer to penetrate the active layer. It may be formed through a process of forming a hole of a depth and a process of coating the nanoparticle inside the hole.
- the nanoparticles are formed by using at least one of a drop casting process, a spin coating process, an electrophoresis process, and a dewetting process to form the nanoholes. can be coated on.
- the active layer may emit red light having a wavelength of 620 nm to 680 nm.
- the nanoparticles may include Au having a first shape for generating surface plasmon resonance with respect to the wavelength of the red light.
- the nanoparticle may be at least one of a core nanoparticle having a core structure and a core-shell nanoparticle having a core-shell structure.
- the nanoparticle is at least one of palladium (Pd), aluminum (Al), silver (Ag), platinum (Pt), copper (Cu), gold (Au), chromium (Cr), and rhodium (Rh). may contain one.
- the nanoholes may include an insulating film disposed between the nanoparticles and the active layer.
- the nanoparticles may cause surface plasmon resonance with the active layer across the insulating film.
- the insulating layer may include at least one of SiO 2 , TiO 2 , ZrO 2 , and Al 2 O 3 .
- the nanoholes may have a diameter of 100 nm to 5 ⁇ m.
- the center-to-center spacing of the nanoholes may be 100 nm to 10 ⁇ m.
- a method of manufacturing a light emitting device including nanoholes includes forming LEDs and ohmic metals, performing a photolithography process, and forming nanoholes. step of depositing a first insulating film, removing PR, coating nanoparticles, depositing a second insulating film, exposing p-ohmic metal, exposing n-GaN, and A step of forming a metal pad may be included.
- the LED may include a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer.
- the nanoholes may be formed to a depth penetrating the second conductivity-type semiconductor layer and the active layer.
- a light emitting device including nanoholes may include nanoholes coated with nanoparticles and formed to a depth penetrating the active layer. Since the nanoparticles are semi-permanently coated at a distance close to the active layer through the nanoholes, the effect of surface plasmon resonance can be increased in the light emitting device including the nanoholes.
- the luminous efficiency of the light emitting device can be maximized.
- FIG. 1 is a cross-sectional view showing a stacked structure of a light emitting device including nanoholes according to embodiments of the present invention.
- FIG. 2 is a perspective view illustrating a stacked structure of a light emitting device including nanoholes of FIG. 1 .
- 3 is an enlarged view showing nanoholes of a light emitting device including nanoholes.
- FIG. 4 is an enlarged view showing nanoparticles coated on nanoholes.
- FIG. 6 is a flowchart illustrating a method of manufacturing a light emitting device including the nanoholes of FIG. 1 .
- FIG. 7 is a view illustrating a process of manufacturing a light emitting device including the nanoholes of FIG. 1 .
- FIG. 8 is a diagram illustrating a case where a light emitting device including nanoholes according to embodiments of the present invention emits front light.
- FIG. 9 is a diagram illustrating a case where a light emitting device including nanoholes according to embodiments of the present invention emits light from the bottom.
- first or second may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component, for example, without departing from the scope of rights according to the concept of the present invention, a first component may be named a second component, Similarly, the second component may also be referred to as the first component.
- FIG. 1 is a cross-sectional view showing a stacked structure of a light emitting device including nanoholes according to embodiments of the present invention
- FIG. 2 is a perspective view showing a stacked structure of a light emitting device including nanoholes of FIG. 1 .
- a light emitting device including nano holes may include a first conductivity type semiconductor layer 200, an active layer 300, a second conductivity type semiconductor layer 400, and nano holes (NH).
- the light emitting device including the nanoholes includes the substrate 100 under the first conductivity type semiconductor layer 200, the ohmic metal 500 on the top of the second conductivity type semiconductor layer 400, and the metal pad 600. can include more.
- the light emitting device including the nanoholes includes a first conductivity-type semiconductor layer 200 formed on a substrate 100, an active layer 300 formed on the first conductivity-type semiconductor layer 200, and an active layer 300. It may include a second conductivity-type semiconductor layer 400 formed thereon, and nanoholes (NH) coated with nanoparticles (NP) causing surface plasmon resonance.
- the substrate 100 may be made of a material capable of epitaxially growing a semiconductor such as GaN.
- the substrate 100 may be sapphire, silicon carbide (SiC), gallium arsenide (GaAs), gallium nitride (GaN), silicon (Si), gallium phosphide (GaP), indium phosphide (InP), zinc oxide (ZnO) ), MgAl 2 O 4 MgO, LiAlO 2 , LiGaO 2 It may include at least one.
- the first conductivity-type semiconductor layer 200 and the second conductivity-type semiconductor layer 400 may be at least one of an n-type semiconductor layer and a p-type semiconductor layer, respectively.
- the first conductivity type semiconductor layer 200 and the second conductivity type semiconductor layer 400 may be formed of a nitride semiconductor.
- the first conductivity-type semiconductor layer 200 and the second conductivity-type semiconductor layer 400 may be made of materials such as GaN, AlGaN, and InGaN.
- Si, Ge, Se, Te, or the like may be used as the n-type impurity of the first conductivity-type semiconductor layer 200 .
- Mg, Zn, Be, or the like may be used as the p-type impurity of the second conductivity-type semiconductor layer 400 .
- the first conductivity-type semiconductor layer 200 and the second conductivity-type semiconductor layer 400 may be formed by at least one of a MOCVD process, an MBE process, and an HVPE process.
- the active layer 300 may emit light having a predetermined energy by recombination of electrons and holes.
- the active layer 300 may be a layer made of a single material such as InGaN.
- the active layer 300 may be formed of a multiple quantum well (MQW) structure in which quantum barrier layers and quantum well layers are alternately disposed.
- MQW multiple quantum well
- the active layer 300 may include at least one of GaN, AlN, InN, InGaN, AlGaN, and InAlGaN.
- the active layer 300 has a multi-quantum well (MQW) structure
- a material having a small energy band gap among GaN, AlN, InN, InGaN, AlGaN, and InAlGaN is composed of a quantum well layer
- GaN, AlN, and InN , InGaN, AlGaN, and InAlGaN a material with a large energy band gap may be configured as a quantum barrier layer.
- the first conductivity type semiconductor layer 200 , the active layer 300 , and the second conductivity type semiconductor layer 400 may form one unit LED structure.
- the ohmic metal 500 may be formed on the second conductivity type semiconductor layer 400 .
- the ohmic metal 500 may be an electrode for applying a voltage to the second conductivity type semiconductor layer 400 .
- the ohmic metal 500 may be a p-ohmic metal.
- the nanoholes NH may be formed in a direction perpendicular to the plane on which the first conductivity type semiconductor layer 200 , the active layer 300 , and the second conductivity type semiconductor layer 400 are stacked.
- the nanoholes NH may be repeatedly formed in a constant arrangement in the unit LED structure in a vertical direction.
- the nano hole NH may be formed to a depth penetrating the second conductivity type semiconductor layer 400 and the active layer 300 .
- nanoholes (NH) may pass through the active layer 300 and may be formed even on a part of the first conductivity type semiconductor layer 200 .
- the nanoholes (NH) may be coated with nanoparticles (NP) that cause surface plasmon resonance.
- the nanoholes NH may include an insulating layer disposed between the nanoparticles NP and the active layer 300 .
- Nanoparticles (NP) may cause surface plasmon resonance with the active layer 300 across the insulating film.
- the nanohole (NH) is formed by forming the ohmic metal 500 on the second conductivity type semiconductor layer 400, the ohmic metal 500, the second conductivity type semiconductor layer 400, and It may be formed through a process of forming a hole having a depth penetrating the active layer 300 by etching the active layer 300 vertically, and a process of coating the inside of the hole with the nanoparticles NP. .
- the nanoparticles (NP) may be semi-permanently coated at a distance close to the active layer 300 through the nanoholes (NH). Therefore, the surface plasmon resonance effect of the nanoparticles (NP) in the light emitting device can be maximized.
- the metal pad 600 may be formed to apply electricity to the unit LED structure through wiring or the like.
- the metal pad 600 may include a p-type metal pad 610 and an n-type metal pad 620 .
- the p-type metal pad 610 may be electrically connected to the ohmic metal 500 .
- the n-type metal pad 620 may be electrically connected to the first conductive semiconductor layer 200 .
- NH 3 is an enlarged view showing nanoholes (NH) of a light emitting device including nanoholes.
- the nanoholes NH may be formed in a direction perpendicular to the plane on which the first conductivity type semiconductor layer 200, the active layer 300, and the second conductivity type semiconductor layer 400 are stacked. .
- a cross section of the nanohole (NH) may have a circular shape as shown in FIG. 3 .
- the diameter of the nanohole (NH) may be 100 nm to 5 ⁇ m.
- the shape of the nanoholes NH is not limited to the circular shape.
- the shape of the nanohole NH may have various shapes such as a triangle, a quadrangle, and a hexagon.
- the nanoholes (NH) may have a regular arrangement.
- the plurality of nanoholes NH may be periodically and repeatedly formed.
- the center-to-center spacing of the plurality of nanoholes NH may be 100 nm to 10 ⁇ m.
- the nanoholes NH may include an insulating layer disposed between the nanoparticles NP and the active layer 300 .
- the nanoparticles (NP) may cause surface plasmon resonance with the active layer 300 across the insulating film.
- the insulating layer may function to form an appropriate distance between the active layer 300 and the nanoparticles NP.
- the insulating layer may have a thickness of 1 nm to 150 nm.
- the insulating layer may include at least one of SiO 2 , TiO 2 , ZrO 2 , and Al 2 O 3 .
- FIG. 4 is an enlarged view showing nanoparticles (NP) coated on nanoholes (NH), and
- FIG. 5 is an optical image showing an example of nanoparticles (NP).
- the nanoparticles NP may be semi-permanently coated inside the nanoholes NH.
- the nanoparticles (NP) may cause surface plasmon resonance.
- Nanoparticles are materials suitable for using the surface plasmon phenomenon, and may be composed of metals that easily emit electrons by external stimulation and have a negative dielectric constant.
- the nanoparticles (NP) include palladium (Pd), aluminum (Al), silver (Ag), platinum (Pt), copper (Cu), gold (Au), chromium (Cr), rhodium (Rh), It may include at least one of nickel (Ni) and titanium (Ti).
- the nanoparticles NP may be semi-permanently coated at a distance close to the active layer 300 through the nanoholes NH formed to a depth penetrating the active layer 300 .
- the nanoparticles (NP) may be coated on the surface of the active layer 300 with an insulating film as a boundary so that the distance from the active layer 300 is 1 nm to 150 nm. That is, the nanoparticles NP may cause surface plasmon resonance with the active layer 300 across the insulating film.
- the nanoparticles (NP) may be core nanoparticles (NP) having a core structure.
- the nanoparticles (NP) may be core-shell nanoparticles (NP) having a core-shell structure.
- the nanoparticles (NP) are formed inside the nanoholes (NH) by using at least one of a drop casting process, a spin coating process, an electrophoresis process, and a dewetting process. can be coated on.
- the unit LED structure may be a red LED emitting red light.
- the active layer 300 may emit red light having a wavelength of 620 nm to 680 nm.
- the nanoparticles NP may include Au having a first shape for generating surface plasmon resonance with respect to the wavelength of red light.
- the nanoparticles (NP) in the red LED may be core-shell nanoparticles (NP) having a core-shell structure.
- nanoparticles (NP) may be composed of an Au core and a SiO 2 shell.
- the nanoparticles NP may have a first shape optimized for a red LED.
- the first shape may be a pointed shape, a star shape, or an angled shape.
- the shape of the nanoparticles (NP) of the present invention is not limited to the first shape.
- the unit LED structure of the present invention may emit green light, blue light, and infrared light in addition to red light.
- the nanoparticles (NP) of the present invention are not limited to the first shape, and may have an optimal shape for generating surface plasmon resonance with respect to the wavelength of the target light source.
- the nanoparticles (NP) may have various shapes such as a sphere, a rectangular parallelepiped, and a regular octahedron.
- FIG. 6 is a flowchart illustrating a method of manufacturing a light emitting device including the nanoholes of FIG. 1
- FIG. 7 is a diagram illustrating a process of manufacturing the light emitting device including the nanoholes of FIG. 1 .
- the light emitting device including the nanoholes includes forming an LED and an ohmic metal 500 (S100), performing a photolithography process (S200), and a nanohole (NH ) Forming (S300), depositing a first insulating film (S400), removing PR (S500), coating nanoparticles (NP) (S600), depositing a second insulating film ( S700), exposing the p-ohmic metal (S800), exposing n-GaN (S900), and forming the metal pad 600 (S1000).
- a method of manufacturing a light emitting device including nanoholes may include forming an LED and an ohmic metal 500 ( S100 ).
- the LED may include a first conductivity type semiconductor layer 200 , an active layer 300 , and a second conductivity type semiconductor layer 400 .
- a method of manufacturing a light emitting device includes forming a first conductivity type semiconductor layer 200 on a substrate 100, forming an active layer 300 on the first conductivity type semiconductor layer 200, and an active layer ( 300), a second conductivity type semiconductor layer 400 may be formed.
- the substrate 100 may be made of a material capable of epitaxially growing a semiconductor such as GaN.
- the substrate 100 may be sapphire, silicon carbide (SiC), gallium arsenide (GaAs), gallium nitride (GaN), silicon (Si), gallium phosphide (GaP), indium phosphide (InP), zinc oxide (ZnO) ), MgAl 2 O 4, MgO, LiAlO 2 , LiGaO 2 It may include at least one.
- the first conductivity type semiconductor layer 200 and the second conductivity type semiconductor layer 400 may be formed of a nitride semiconductor.
- the first conductivity-type semiconductor layer 200 and the second conductivity-type semiconductor layer 400 may be made of materials such as GaN, AlGaN, and InGaN.
- the active layer 300 may emit light having a predetermined energy by recombination of electrons and holes.
- the active layer 300 may be formed of a multiple quantum well (MQW) structure in which quantum barrier layers and quantum well layers are alternately disposed.
- MQW multiple quantum well
- a material with a small energy band gap among GaN, AlN, InN, InGaN, AlGaN, and InAlGaN is composed of a quantum well layer
- a material with a large energy band gap among GaN, AlN, InN, InGaN, AlGaN, and InAlGaN is a quantum well layer. It may consist of a barrier layer.
- the ohmic metal 500 may be further formed on the second conductivity type semiconductor layer 400 .
- the ohmic metal 500 may be an electrode for applying a voltage to the second conductivity type semiconductor layer 400 .
- the ohmic metal 500 may be a p-ohmic metal.
- a method of manufacturing a light emitting device including nanoholes may include performing a photolithography process (S200).
- a mask metal may be deposited on the ohmic metal 500 over the LED structure, and the mask metal may be selectively patterned.
- FIB focused ion beam
- SiO2 nanoparticles SiO2 nanoparticles
- self-assembled metal mask The mask metal may be patterned using a mask or the like.
- a method of manufacturing a light emitting device including nanoholes may include forming nanoholes (NH) (S300).
- the nanoholes NH may be formed in a direction perpendicular to the plane on which the first conductivity type semiconductor layer 200 , the active layer 300 , and the second conductivity type semiconductor layer 400 are stacked.
- the nanoholes NH may be repeatedly formed in a constant arrangement in the unit LED structure in a vertical direction.
- a selective etching process using nano-patterning technology may be used to selectively remove the unit LED structure and the ohmic metal 500 .
- selective etching may be performed using a dry etching method.
- the step of forming the nanoholes includes reactive ion etching (RIE), inductively coupled plasma reactive ion etching (ICP-RIE), and chemically coupled plasma reactive ion etching (ICP-RIE).
- RIE reactive ion etching
- ICP-RIE inductively coupled plasma reactive ion etching
- ICP-RIE chemically coupled plasma reactive ion etching
- Selective etching may be performed using assisted ion beam etching (CAIBE) or the like.
- the unit LED structure and the ohmic metal 500 may be etched by appropriately adjusting process parameters such as selectivity and etch rate.
- the nano hole NH may be formed to a depth penetrating the second conductivity type semiconductor layer 400 and the active layer 300 .
- nanoholes (NH) may pass through the active layer 300 and may be formed even on a part of the first conductivity type semiconductor layer 200 .
- a method of manufacturing a light emitting device including nanoholes may include depositing a first insulating film (S400) and removing PR (S500).
- the nanohole NH may include a first insulating layer disposed between the nanoparticle NP and the active layer 300 .
- the first insulating layer may serve to form an appropriate distance between the active layer 300 and the nanoparticles NP.
- the first insulating layer may have a thickness of 1 nm to 150 nm.
- the first insulating layer may include at least one of SiO 2 , TiO 2 , ZrO 2 , and Al 2 O 3 .
- a PR removal process may be performed.
- PR can be removed using acetone and isopropyl alcohol (IPA).
- IPA isopropyl alcohol
- PR may be removed by an etching process.
- a method of manufacturing a light emitting device including nanoholes may include coating nanoparticles (NP) (S600).
- Nanoparticles (NP) causing surface plasmon resonance may be coated on the nanoholes (NH). Nanoparticles (NP) may cause surface plasmon resonance with the active layer 300 with the first insulating layer as a boundary.
- Nanoparticles are materials suitable for using the surface plasmon phenomenon, and may be composed of metals that easily emit electrons by external stimulation and have a negative dielectric constant.
- the nanoparticles (NP) include palladium (Pd), aluminum (Al), silver (Ag), platinum (Pt), copper (Cu), gold (Au), chromium (Cr), rhodium (Rh), It may include at least one of nickel (Ni) and titanium (Ti).
- the nanoparticles (NP) may be core nanoparticles (NP) having a core structure.
- the nanoparticles (NP) may be core-shell nanoparticles (NP) having a core-shell structure.
- the nanoparticles (NP) are formed inside the nanoholes (NH) by using at least one of a drop casting process, a spin coating process, an electrophoresis process, and a dewetting process. can be coated on.
- the surface plasmon resonance effect in the light emitting device can be maximized.
- a method of manufacturing a light emitting device including nanoholes may include depositing a second insulating film ( S700 ).
- the second insulating film may serve to protect the nanoparticles NP so that the nanoparticles NP can be semi-permanently coated inside the nanoholes NH.
- the second insulating layer may include at least one of SiO 2 , TiO 2 , ZrO 2 , and Al 2 O 3 .
- a method of manufacturing a light emitting device including nanoholes includes exposing p-ohmic metal (S800), exposing n-GaN (S900), and forming a metal pad 600 (S800). S1000) may be included.
- the step of exposing the p-ohmic metal exposes the p-ohmic metal by ashing and etching the second insulating film formed on the upper layer of the ohmic metal 500 on the second conductivity type semiconductor layer 400 can do.
- the n-GaN may be exposed by removing the second insulating film formed on the upper portion of the first conductive semiconductor layer 200 using a photolithography process and a dry etching process.
- the p-type metal pad 610 and the n-type metal pad 620 may be formed to apply electricity to the unit LED structure through wiring or the like.
- the p-type metal pad 610 may be electrically connected to a p-ohmic metal.
- the n-type metal pad 620 may be electrically connected to the first conductive semiconductor layer 200 .
- FIG. 8 is a diagram illustrating a case where a light emitting device including nanoholes according to embodiments of the present invention emits front light.
- light output from the active layer 300 may pass through the ohmic metal 500 .
- the ohmic metal 500 may be made of a transparent metal. Accordingly, the light emitting device including the nanoholes may emit light from the entire surface.
- the internal quantum efficiency may increase.
- FIG. 9 is a diagram illustrating a case where a light emitting device including nanoholes according to embodiments of the present invention emits light from the bottom.
- the ohmic metal 500 may be formed of a metal capable of reflecting light. Accordingly, the light emitting device including the nanoholes may emit light from the bottom.
- the internal quantum efficiency may increase.
- the nanoparticles (NP) are semi-permanently coated at a distance close to the active layer 300 through the nanoholes (NH), the effect of surface plasmon resonance may be increased in the light emitting device including the nanoholes.
- the luminous efficiency of the light emitting device can be maximized.
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Claims (11)
- 제1 도전형 반도체층;상기 제1 도전형 반도체층 상에 형성된 활성층;상기 활성층 상에 형성된 제2 도전형 반도체층; 및표면 플라즈몬 공명을 일으키는 나노입자가 코팅된 나노홀을 포함하고,상기 나노홀은 상기 제2 도전형 반도체층 및 상기 활성층을 관통하는 깊이로 형성되는 것을 특징으로 하는,나노홀을 포함하는 발광소자.
- 제1항에 있어서,상기 나노홀은,상기 제2 도전형 반도체층 상에 오믹 메탈을 형성하는 공정, 상기 오믹 메탈, 상기 제2 도전형 반도체층, 및 상기 활성층을 수직으로 에칭함으로써 상기 활성층을 관통하는 깊이의 홀(hole)을 형성하는 공정, 및 상기 홀 내부에 상기 나노입자를 코팅하는 공정을 통해 형성되는 것을 특징으로 하는,나노홀을 포함하는 발광소자.
- 제1항에 있어서,상기 나노입자는,드롭 캐스팅(drop casting) 공정, 스핀 코팅(spin coating) 공정, 전기영동(electrophoresis) 공정, 및 디웨팅(dewetting) 공정 중 적어도 하나의 공정을 이용하여 상기 나노홀에 코팅되는 것을 특징으로 하는,나노홀을 포함하는 발광소자.
- 제1항에 있어서,상기 활성층은 620nm 내지 680nm 파장의 적색광을 방출하고,상기 나노입자는 상기 적색광의 파장에 대한 표면 플라즈몬 공명을 일으키기 위한 제1 형상을 가지는 Au를 포함하는 것을 특징으로 하는,나노홀을 포함하는 발광소자.
- 제1항에 있어서,상기 나노입자는,코어 구조를 가지는 코어(Core) 나노입자, 및 코어-쉘(Core-shell) 구조를 가지는 코어-쉘 나노입자 중 적어도 하나인 것을 특징으로 하는,나노홀을 포함하는 발광소자.
- 제1항에 있어서,상기 나노입자는,팔라듐(Pd), 알루미늄(Al), 은(Ag), 백금(Pt), 구리(Cu), 금(Au), 크롬(Cr), 로듐(Rh) 중 적어도 하나를 포함하는 것을 특징으로 하는,나노홀을 포함하는 발광소자.
- 제1항에 있어서,상기 나노홀은 상기 나노입자 및 상기 활성층 사이에 배치되는 절연막을 포함하고,상기 나노입자는 상기 절연막을 경계로 상기 활성층과 표면 플라즈몬 공명을 일으키는 것을 특징으로 하는,나노홀을 포함하는 발광소자.
- 제7항에 있어서,상기 절연막은 SiO2, TiO2, ZrO2, 및 Al2O3 중 적어도 하나를 포함하는 것을 특징으로 하는,나노홀을 포함하는 발광소자.
- 제1항에 있어서,상기 나노홀의 직경은 100nm 내지 5μm인 것을 특징으로 하는,나노홀을 포함하는 발광소자.
- 제1항에 있어서,상기 나노홀의 중심간 간격은 100nm 내지 10μm인 것을 특징으로 하는,나노홀을 포함하는 발광소자.
- LED 및 오믹 메탈을 형성하는 단계;포토리소그래피 공정을 수행하는 단계;나노홀을 형성하는 단계;제1 절연막을 증착하는 단계;PR을 제거하는 단계;나노입자를 코팅하는 단계;제2 절연막을 증착하는 단계;p-오믹 메탈을 노출하는 단계;n-GaN을 노출하는 단계; 및메탈 패드를 형성하는 단계를 포함하고,상기 LED는 제1 도전형 반도체층, 활성층, 및 제2 도전형 반도체층을 포함하고,상기 나노홀은 상기 제2 도전형 반도체층 및 상기 활성층을 관통하는 깊이로 형성되는 것을 특징으로 하는,나노홀을 포함하는 발광소자의 제조 방법.
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| US18/839,328 US20250160060A1 (en) | 2021-02-19 | 2022-02-18 | Light-emitting diode comprising nanoholes having metal nanoparticles applied thereto, and manufacturing method thereof |
| JP2024548355A JP7794500B2 (ja) | 2021-02-19 | 2022-02-18 | 金属ナノ粒子が適用されたナノホールを含む発光素子及びその製造方法 |
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| KR1020220020230A KR102653097B1 (ko) | 2021-02-19 | 2022-02-16 | 금속 나노입자가 적용된 나노홀을 포함하는 발광소자 및 이의 제조 방법 |
| KR10-2022-0020230 | 2022-02-16 |
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| JP7794500B2 (ja) | 2026-01-06 |
| KR20220118931A (ko) | 2022-08-26 |
| US20250160060A1 (en) | 2025-05-15 |
| KR102653097B1 (ko) | 2024-04-02 |
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