KR101239850B1 - Vertical light emitting diode and method of fabricating the same - Google Patents
Vertical light emitting diode and method of fabricating the same Download PDFInfo
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- KR101239850B1 KR101239850B1 KR1020060093393A KR20060093393A KR101239850B1 KR 101239850 B1 KR101239850 B1 KR 101239850B1 KR 1020060093393 A KR1020060093393 A KR 1020060093393A KR 20060093393 A KR20060093393 A KR 20060093393A KR 101239850 B1 KR101239850 B1 KR 101239850B1
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Abstract
A vertical light emitting diode and a method of manufacturing the same are disclosed. The method includes forming a compound semiconductor layer including a first conductive compound semiconductor layer, an active layer, and a second conductive compound semiconductor layer on the sacrificial substrate. A conductive substrate is formed on the compound semiconductor layers, and metal patterns defining scribing lines are formed on the conductive substrate. Subsequently, the sacrificial substrate is separated from the compound semiconductor layers to expose a first conductive compound semiconductor layer, and an electrode pad is formed on the first conductive compound semiconductor layer. Thereafter, the conductive substrate is cut along the scribing lines and separated into individual light emitting diode chips. The metal patterns are separated along the scribing line, thereby preventing the compound semiconductor layers and the conductive substrate from warping when separating the compound semiconductor layers from the sacrificial substrate, and facilitating a process of cutting the conductive substrate.
Vertical Light Emitting Diodes, Metal Patterns, Sub-patterns
Description
1 is a cross-sectional view illustrating a method of manufacturing a vertical light emitting diode according to the prior art.
2 is a cross-sectional view illustrating a method of manufacturing a light emitting diode according to an embodiment of the present invention.
3 is a plan view illustrating metal patterns applicable to embodiments of the present invention.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical light emitting diode and a method of manufacturing the same, and more particularly, to a vertical light emitting diode employing a metal pattern for preventing bowing and a method of manufacturing the same.
In general, nitrides of Group III elements, such as gallium nitride (GaN) and aluminum nitride (AlN), have excellent thermal stability and have a direct transition energy band structure. As a lot of attention. In particular, blue and green light emitting devices using gallium nitride (GaN) have been utilized in various applications such as large-scale color flat panel display devices, traffic lights, indoor lighting, high density light sources, high resolution output systems, and optical communications.
The nitride semiconductor layer of such a group III element, in particular, GaN, is difficult to fabricate a homogeneous substrate capable of growing it, and thus, it is difficult to fabricate a homogeneous substrate capable of growing it, such as metal organic chemical vapor deposition (MOCVD) or molecular beam epitaxy; MBE) and other processes. A sapphire substrate having a hexagonal system structure is mainly used as a heterogeneous substrate. However, since sapphire is an electrically insulator, it restricts the light emitting diode structure and is very stable mechanically and chemically, making it difficult to process such as cutting and shaping. In recent years, a technology for growing a nitride semiconductor layer on a heterogeneous substrate such as sapphire and then separating the heterogeneous substrate to fabricate a vertical-type LED has been researched.
1 is a cross-sectional view illustrating a method of manufacturing a vertical light emitting diode according to the prior art.
Referring to FIG. 1A, gallium nitride-based compound semiconductor layers are sequentially grown on a
Referring to FIG. 1B, a
Referring to FIG. 1C, the
According to the prior art, by adopting the
The warpage phenomenon can be solved to some extent by adjusting the thermal expansion coefficient or the thickness of the conductive substrate. However, it is difficult to control the coefficient of thermal expansion of the conductive substrate, and especially when adopting a metal conductive substrate having excellent electrical conductivity, it is required to adjust the composition ratio of the metal elements using alloying technology to control the coefficient of thermal expansion. In addition, when the conductive substrate is thick, the cutting process of the conductive substrate becomes difficult, and when the conductive substrate is cut using a laser, the laser power is increased, and a lot of metal by-products are generated to contaminate the chip.
SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a vertical light emitting diode manufacturing method which can prevent warpage of a compound semiconductor layer when the sacrificial substrate is separated, and which can easily cut a conductive substrate.
Another object of the present invention is to provide a light emitting diode manufacturing method capable of preventing warpage of the light emitting diode even after being separated into individual light emitting diode chips.
Another object of the present invention is to provide a vertical light emitting diode capable of preventing warpage of the compound semiconductor layers.
In order to achieve the above technical problem, an aspect of the present invention provides a vertical light emitting diode manufacturing method. The method includes forming a compound semiconductor layer including a first conductive compound semiconductor layer, an active layer, and a second conductive compound semiconductor layer on the sacrificial substrate. A conductive substrate is formed on the compound semiconductor layers, and metal patterns defining scribing lines are formed on the conductive substrate. Subsequently, the sacrificial substrate is separated from the compound semiconductor layers to expose a first conductive compound semiconductor layer, and an electrode pad is formed on the first conductive compound semiconductor layer. The conductive substrate is then cut along the scribing lines and separated into individual light emitting diode chips. The metal patterns are separated along the scribing line to prevent the compound semiconductor layers and the conductive substrate from warping when the compound semiconductor layers are separated from the sacrificial substrate, and the conductive substrate can be thinned to facilitate the cutting process. Let's do it.
Each of the metal patterns may have lower patterns spaced apart from each other on a cross section. Therefore, even after being separated into individual light emitting diode chips, it is possible to further prevent the bending of each chip.
Meanwhile, the metal patterns may be formed using a plating technique. Accordingly, the metal patterns may be easily formed by selectively plating a metal material.
Another aspect of the invention provides a vertical light emitting diode. This light emitting diode includes a conductive substrate. Compound semiconductor layers are positioned on the conductive substrate. The compound semiconductor layers include a first conductive compound semiconductor layer, an active layer, and a second conductive compound semiconductor layer. Meanwhile, a metal pattern is disposed on the conductive substrate to face the compound semiconductor layers. The metal pattern is located within a region of the conductive substrate. In addition, electrode pads are disposed on the compound semiconductor layers to face the conductive substrate. According to this aspect, a metal pattern is located on a conductive substrate to prevent bending of the light emitting diode. In addition, since the metal pattern is limited in the area of the conductive substrate, a plurality of light emitting diodes can be easily provided using a single conductive substrate.
On the other hand, the metal pattern may have lower patterns spaced apart from each other on the cross section. Therefore, the stress caused by the metal pattern can be reduced, thereby further preventing warping of the compound semiconductor layers.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided as examples to ensure that the spirit of the present invention can be fully conveyed to those skilled in the art. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the width, length, thickness, and the like of the components may be exaggerated for convenience. Like numbers refer to like elements throughout.
2 is a cross-sectional view illustrating a method of manufacturing a vertical light emitting diode according to an exemplary embodiment of the present invention, and FIG. 3 is a plan view illustrating a metal pattern applicable to embodiments of the present invention.
Referring to FIG. 2A, compound semiconductor layers are formed on the
Meanwhile, before forming the compound semiconductor layers, the
Referring to FIG. 2B,
The coefficient of thermal expansion of the
On the other hand, when the
Subsequently,
On the other hand, each of the
Various shapes of the
Referring to FIG. 2C, the
Subsequently,
Referring to FIG. 2 (d), a vertical light emitting diode is completed by cutting the
According to the present embodiment, a vertical light emitting diode in which compound semiconductor layers are positioned on a
The vertical light emitting diode may prevent the compound semiconductor layers from bending by adopting the
According to embodiments of the present invention, by adopting metal patterns defining scribing lines, it is possible to prevent warpage of the compound semiconductor layers and to increase the thickness of the conductive substrate that needs to be cut. Separation process is easy. In addition, by forming the metal patterns to have sub-patterns, the stress of the conductive substrate can be reduced even after being separated into individual LED chips, thereby further preventing warpage of the LED.
Claims (5)
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KR1020060093393A KR101239850B1 (en) | 2006-09-26 | 2006-09-26 | Vertical light emitting diode and method of fabricating the same |
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KR1020060093393A KR101239850B1 (en) | 2006-09-26 | 2006-09-26 | Vertical light emitting diode and method of fabricating the same |
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KR101239850B1 true KR101239850B1 (en) | 2013-03-06 |
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KR101064070B1 (en) | 2008-11-25 | 2011-09-08 | 엘지이노텍 주식회사 | Semiconductor light emitting device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20050012729A (en) * | 2002-04-09 | 2005-02-02 | 오리올 인코포레이티드 | Method Of Fabricating Vertical Structure LEDs |
KR20050026380A (en) * | 2002-04-09 | 2005-03-15 | 오리올 인코포레이티드 | Method of etching substrates |
KR100609119B1 (en) | 2005-05-04 | 2006-08-08 | 삼성전기주식회사 | Manufacturing method of vertically structured gan type led device |
KR20060109378A (en) * | 2005-04-15 | 2006-10-20 | 삼성전기주식회사 | Fabricating method of vertical structure nitride semiconductor light emitting device |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20050012729A (en) * | 2002-04-09 | 2005-02-02 | 오리올 인코포레이티드 | Method Of Fabricating Vertical Structure LEDs |
KR20050026380A (en) * | 2002-04-09 | 2005-03-15 | 오리올 인코포레이티드 | Method of etching substrates |
KR20060109378A (en) * | 2005-04-15 | 2006-10-20 | 삼성전기주식회사 | Fabricating method of vertical structure nitride semiconductor light emitting device |
KR100609119B1 (en) | 2005-05-04 | 2006-08-08 | 삼성전기주식회사 | Manufacturing method of vertically structured gan type led device |
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