KR20130016945A - Light emitting device and method for fabricating the same - Google Patents
Light emitting device and method for fabricating the same Download PDFInfo
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- KR20130016945A KR20130016945A KR1020110079156A KR20110079156A KR20130016945A KR 20130016945 A KR20130016945 A KR 20130016945A KR 1020110079156 A KR1020110079156 A KR 1020110079156A KR 20110079156 A KR20110079156 A KR 20110079156A KR 20130016945 A KR20130016945 A KR 20130016945A
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- Prior art keywords
- layer
- light emitting
- ohmic
- emitting device
- current blocking
- Prior art date
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Images
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
- H01L33/02—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
- H01L33/10—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 light reflecting structure, e.g. semiconductor Bragg reflector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/14—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a carrier transport control structure, e.g. highly-doped semiconductor layer or current-blocking structure
- H01L33/145—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a carrier transport control structure, e.g. highly-doped semiconductor layer or current-blocking structure with a current-blocking structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/20—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
- H01L33/22—Roughened surfaces, e.g. at the interface between epitaxial layers
-
- 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
- H01L33/36—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 electrodes
- H01L33/40—Materials therefor
- H01L33/405—Reflective materials
-
- 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
- H01L33/36—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 electrodes
- H01L33/40—Materials therefor
- H01L33/42—Transparent materials
-
- 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
- H01L33/44—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 coatings, e.g. passivation layer or anti-reflective coating
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Led Devices (AREA)
Abstract
Description
Embodiments relate to a light emitting device, a method of manufacturing the light emitting device, a light emitting device package and an illumination system.
Light Emitting Device (LED) is a device that converts electrical energy into light energy and can realize various colors by adjusting the composition ratio of compound semiconductors.
The light emitting device has advantages of low power consumption, semi-permanent life, fast response speed, safety, and environmental friendliness compared to conventional light sources such as fluorescent lamps and incandescent lamps.
Therefore, many researches are being made to replace the existing light sources with light emitting devices, and the use of light emitting devices as light sources for lighting devices such as lamps, liquid crystal displays, electronic signs, and street lamps, which are used indoors and outdoors, is increasing. to be.
For example, nitride semiconductors have received great interest in the development of optical devices and high power electronic devices due to their high thermal stability and wide bandgap energy. In particular, blue light emitting devices, green light emitting devices, and ultraviolet light emitting devices using nitride semiconductors are commercially used and widely used.
The expansion of the application range of the light emitting device basically requires the development of high output and high efficiency technology of the light emitting device.
Embodiments provide a high output, high efficiency light emitting device, a method of manufacturing a light emitting device, a light emitting device package, and an illumination system.
In addition, the embodiment is to provide a light emitting device, a method of manufacturing a light emitting device, a light emitting device package and an illumination system with improved reliability.
The light emitting device according to the embodiment includes a support substrate; A reflective layer on the support substrate; An ohmic layer on the reflective layer; And a light emitting structure formed on the ohmic layer, and includes roughness at a portion of an interface between the reflective layer and the ohmic layer.
In addition, the method of manufacturing a light emitting device according to the embodiment comprises the steps of forming a light emitting structure on the growth substrate; Forming a protective layer and a current blocking layer on the light emitting structure corresponding to the unit chip region; Forming an ohmic layer on the light emitting structure, the current blocking layer, and the protective layer; Forming roughness on the ohmic layer; And forming a reflective layer on the ohmic layer.
The embodiment can provide a high power, high efficiency light emitting device, a method of manufacturing a light emitting device, a light emitting device package, and an illumination system.
In addition, the embodiment can provide a light emitting device, a method of manufacturing a light emitting device, a light emitting device package and an illumination system with improved reliability.
1 is a sectional view of a light emitting device according to a first embodiment;
2 is a cross-sectional view of a light emitting device according to a second embodiment;
3 to 10 are cross-sectional views of a light emitting device according to the embodiment;
11 is a cross-sectional view of a light emitting device package according to an embodiment.
12 is a perspective view of a lighting unit according to an embodiment.
13 is a perspective view of a backlight unit according to an embodiment.
In the description of the embodiments, it is to be understood that each layer (film), area, pattern or structure may be referred to as being "on" or "under" the substrate, each layer Quot; on "and" under "are intended to include both" directly "or" indirectly " do. Also, the criteria for top, bottom, or bottom of each layer will be described with reference to the drawings.
The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. In addition, the size of each component does not necessarily reflect the actual size.
(Example)
1 is a cross-sectional view of a
The
The
In an embodiment, roughness may be included at an interface between the
For example, the embodiment further includes a
The
According to the embodiment, the concave-convex pattern is formed between the
In an embodiment, an upper surface of the
The
In addition, the embodiment further includes a
According to the embodiment, the concave-convex pattern is formed between the
The upper surface of the
Therefore, when the isolation etching is performed to separate the
According to the embodiment, the concave-convex pattern is formed between the
Accordingly, the embodiment can provide a light emitting device and a method of manufacturing the light emitting device having improved reliability.
2 is a sectional view of the
The second embodiment may employ the technical features of the first embodiment, and will be described below with reference to the features of the second embodiment.
The second embodiment may include irregularities in the entire interface between the
For example, in the second embodiment, the interface between the
According to the embodiment, the concave-convex pattern is formed between the
The embodiment may further include a
A
According to the embodiment, the concave-convex pattern is formed between the
The embodiment can provide a high power, high efficiency light emitting device, a method of manufacturing a light emitting device, a light emitting device package, and an illumination system.
In addition, the embodiment can provide a light emitting device, a method of manufacturing a light emitting device, a light emitting device package and an illumination system with improved reliability.
Hereinafter, the features of the embodiment will be described in more detail with reference to FIGS. 3 to 10 while describing a method of manufacturing the light emitting device according to the embodiment.
First, the
The
The
The
Meanwhile, a buffer layer (not shown) and / or an undoped semiconductor layer (not shown) may be formed between the
The first conductivity
The first
The first conductivity
Thereafter, a current spreading layer (not shown), an electron injection layer (not shown), or a strain control layer (not shown) may be formed on the first
The current diffusion layer may be an undoped GaN layer, but is not limited thereto.
The electron injection layer (not shown) may be a first conductivity type gallium nitride layer. For example, the electron injection layer may be the electron injection efficiently by being doped at a concentration of the n-type doping element 6.0x10 18 atoms / cm 3 ~ 8.0x10 18 atoms / cm 3.
In addition, the embodiment may form a strain control layer (not shown) formed of In y Al x Ga (1-xy) N (0≤x≤1, 0≤y≤1) / GaN, etc. on the electron injection layer. have. The strain control layer may effectively mitigate stress that is odd due to lattice mismatch between the first conductivity-
In addition, as the strain control layer is repeatedly stacked in at least six cycles having the composition of the first InGaN and the second InGaN, more electrons are collected at the low energy level of the
Thereafter, the
The
The
The well layer / barrier layer of the
Next, in the embodiment, the electron blocking layer (not shown) is formed on the
The electron blocking layer may be formed of a superlattice of Al z Ga (1-z) N / GaN (0? Z ? 1), but is not limited thereto.
The electron blocking layer can efficiently block the electrons that are ion-implanted into the p-type and overflow, and increase the hole injection efficiency. For example, the electron blocking layer can effectively prevent electrons that are overflowed by ion implantation of Mg in a concentration range of about 10 18 to 10 20 / cm 3 , and increase the hole injection efficiency.
Thereafter, a second conductivity
The second conductive
The second conductivity
In an exemplary embodiment, the first conductivity
Next, as shown in FIG. 4, the
The
For example, the
The
The
In addition, the
In addition, the
Next, as shown in FIGS. 5 and 6, the
The
The area in which the
The
The
Meanwhile, the
The
Since the
In an embodiment, roughness may be included at an interface between the
For example, the first embodiment further includes a
In addition, the first embodiment further includes a
According to the embodiment, the concave-convex pattern is formed between the
In addition, the second embodiment may include irregularities in the entire interface between the
Next, as shown in FIG. 7, the
Although the embodiment illustrates that the
The
The
The unevenness between the
The
The
The
The
Next, as shown in FIG. 8, the
Next, as shown in FIG. 9, an isolation etching is performed on the
For example, the isolation etching may be performed by a dry etching method such as inductively coupled plasma (ICP), but is not limited thereto.
Next, as shown in FIG. 10, a
A
Thereafter, when the structure is separated into a unit chip region through a chip separation process, a plurality of light emitting devices may be manufactured. The chip separation process may include, for example, a breaking process of separating a chip by applying a physical force using a blade, a laser scribing process of separating a chip by irradiating a laser to a chip boundary, and a wet etching or a dry etching process. It may include an etching process, but is not limited thereto.
In an embodiment, the
According to the embodiment, the concave-convex pattern is formed between the
The embodiment can provide a high power, high efficiency light emitting device, a method of manufacturing a light emitting device, a light emitting device package, and an illumination system.
In addition, the embodiment can provide a light emitting device, a method of manufacturing a light emitting device, a light emitting device package and an illumination system with improved reliability.
11 is a cross-sectional view of a light emitting
The light emitting
The
The
The
The
The
The
A plurality of light emitting device packages according to the embodiment may be arranged on a substrate, and a light guide plate, a prism sheet, a diffusion sheet, a fluorescent sheet, or the like, which is an optical member, may be disposed on a path of light emitted from the light emitting device package. The light emitting device package, the substrate, and the optical member may function as a backlight unit or function as a lighting unit. For example, the lighting system may include a backlight unit, a lighting unit, a pointing device, a lamp, and a streetlight.
12 is a
In the embodiment, the
The
The light emitting
The substrate 1132 may be a circuit pattern printed on an insulator, and for example, a general printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, and the like. It may include.
In addition, the substrate 1132 may be formed of a material that reflects light efficiently, or the surface may be formed of a color that reflects light efficiently, for example, white, silver, or the like.
The at least one light emitting
The light emitting
The
13 is an exploded
The
The
The light emitting
The light emitting
The
The plurality of light emitting device packages 200 may be mounted on the
The
The
The
The embodiment can provide a high power, high efficiency light emitting device, a method of manufacturing a light emitting device, a light emitting device package, and an illumination system.
In addition, the embodiment can provide a light emitting device, a method of manufacturing a light emitting device, a light emitting device package and an illumination system with improved reliability.
The features, structures, effects and the like described in the embodiments are included in at least one embodiment and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in each embodiment may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Accordingly, the contents of such combinations and modifications should be construed as being included in the scope of the embodiments.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. It can be seen that the modification and application of branches are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.
100: light emitting element, 190: support substrate
160: reflective layer, 150:
145: current blocking layer, 140: protective layer
135: light emitting structure
Claims (15)
A reflective layer on the support substrate;
An ohmic layer on the reflective layer;
And a light emitting structure formed on the ohmic layer.
And a roughness at a portion of an interface between the reflective layer and the ohmic layer.
The ohmic layer includes a transparent electrode layer,
Further comprising a current blocking layer formed in a partial region between the transparent electrode layer and the light emitting structure,
The unevenness is formed in the region vertically overlap with the current blocking layer.
Further comprising a protective layer on the outside between the transparent electrode layer and the light emitting structure,
The unevenness is formed in a region vertically overlapping with the protective layer.
The unevenness is further formed at an interface between the reflective layer and the ohmic layer between the protective layer and the current blocking layer.
The transparent electrode layer
Indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), indium aluminum zinc oxide (IAZO), indium gallium zinc oxide (IGZO), indium gallium tin oxide (IGTO), aluminum zinc oxide), ATO (antimony tin oxide), GZO (gallium zinc oxide), IZON (IZO Nitride), AGZO (Al-Ga ZnO), IGZO (In-Ga ZnO), ZnO, IrOx, RuOx, NiO, RuOx / ITO , Ni / IrOx / Au, and Ni / IrOx / Au / ITO, Ag, Ni, Cr, Ti, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, Hf device.
The reflective layer
A light emitting device comprising at least one of Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, Hf or their alloys.
The reflective layer
A light emitting device comprising any one of indium zinc oxide (IZO) / Ni, aluminum zinc oxide (AZO) / Ag, IZO / Ag / Ni, AZO / Ag / Ni, Ag / Cu, Ag / Pd / Cu.
The transparent electrode layer
The light emitting device is formed along the interface step of the current blocking layer.
The ohmic layer is formed with a thickness of 20nm ~ 50nm, the reflective layer is formed with a thickness of 180nm to 220nm.
Forming a protective layer and a current blocking layer on the light emitting structure corresponding to the unit chip region;
Forming an ohmic layer on the light emitting structure, the current blocking layer, and the protective layer;
Forming roughness on the ohmic layer; And
Forming a reflective layer on the ohmic layer; manufacturing method of a light emitting device comprising a.
Forming the irregularities on the ohmic layer,
And the concave-convex portion is formed at a portion of an interface between the reflective layer and the ohmic layer.
The unevenness is a method of manufacturing a light emitting device is formed on the ohmic layer of the region vertically overlap with the current blocking layer.
The unevenness is a method of manufacturing a light emitting device is formed on the ohmic layer of the region vertically overlapping with the protective layer.
The unevenness is formed on the ohmic layer between the protective layer and the current blocking layer.
The unevenness is
Method of manufacturing a light emitting device formed by wet etching or dry etching a portion of the upper surface of the ohmic layer.
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KR1020110079156A KR20130016945A (en) | 2011-08-09 | 2011-08-09 | Light emitting device and method for fabricating the same |
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KR1020110079156A KR20130016945A (en) | 2011-08-09 | 2011-08-09 | Light emitting device and method for fabricating the same |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11320548B2 (en) | 2018-05-30 | 2022-05-03 | Nanokem | Apparatus and method for detecting earthquake using accelerometer |
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2011
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11320548B2 (en) | 2018-05-30 | 2022-05-03 | Nanokem | Apparatus and method for detecting earthquake using accelerometer |
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