This Non-provisional application claims priority under 35 U.S.C. ยง119(a) on Patent Application No(s). 096137372 filed in Taiwan, Republic of China on Oct. 5, 2007, the entire contents of which are hereby incorporated by reference.
1. Field of Invention
The invention relates to an epitaxial substrate and a manufacturing method thereof and, in particular, to a manufacturing method of a light emitting diode apparatus.
2. Related Art
A light emitting diode (LED) apparatus is a light emitting element made of semiconductor material. Since the LED apparatus advantageously has small size, low power consumption, no radiation, no mercury, long lifetime, high response speed and high reliability, the application range thereof covers the fields of the information electronic product, the communication electronic product, the consumer electronic product, the vehicle product, the illumination product and the traffic sign with the advancing technology.
Generally speaking, the LED must have an epitaxy multilayer grown on an epitaxial substrate, wherein an N-type epitaxial layer, an active layer and a P-type epitaxial layer are grown on the epitaxial substrate in sequence. In order to decrease the number of defects generated when the N-type epitaxial layer is directly growing on the flat epitaxial substrate, however, an epitaxial substrate having periodic holes is manufactured to prevent the defects from being formed.
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In the conventional semiconductor manufacturing technology, however, complicated manufacturing steps have to be performed to form the nano-level hollow portions H1 by etching or electron beam exposure. Thus, the production yield is decreased. In addition, the apparatus cost for the laser lift-off technology is also very high. Therefore, it is an important subject to provide an epitaxial substrate, a manufacturing method of the epitaxial substrate and a manufacturing method of a LED apparatus capable of simplifying semiconductor manufacturing steps.
The present invention is to provide an epitaxial substrate, a manufacturing method of the epitaxial substrate and a manufacturing method of a LED apparatus capable of simplifying semiconductor manufacturing steps.
To achieve the above, the present invention discloses a manufacturing method of an epitaxial substrate including the steps of: forming a sacrificial layer, which has a first micro/nano structure, on a substrate, and forming a buffer layer on the sacrificial layer.
In addition, the present invention further discloses a manufacturing method of an epitaxial substrate including the steps of: forming a buffer layer on a substrate; forming a sacrificial layer, which has a first micro/nano structure, on the buffer layer; etching the buffer layer with the sacrificial layer serving as an etching mask so that the buffer layer has a second micro/nano structure corresponding to the first micro/nano structure; and removing the sacrificial layer by etching or calcination.
To achieve the above, the present invention also discloses an epitaxial substrate including a substrate and a buffer layer. The buffer layer is disposed on the substrate and has a micro/nano structure.
Moreover, the present invention also discloses a manufacturing method of a light emitting diode (LED) apparatus including the steps of: providing an epitaxial substrate having a micro/nano structure; forming a first semiconductor layer on the micro/nano structure of the epitaxial substrate; forming an active layer on the first semiconductor layer; and forming a second semiconductor layer on the active layer.
As mentioned above, the epitaxial substrate, the manufacturing method thereof and the manufacturing method of the LED apparatus according to the present invention have the following features. First, the sacrificial layer having the micro/nano structure is disposed on the buffer layer or the substrate. Next, the nano-particles are removed by etching or calcination so that the buffer layer or the substrate has the micro/nano holes. In addition, compared with the prior art, in which the epitaxial substrate is removed by the laser lift-off technology, the epitaxial substrate is removed by etching in the manufacturing method of the LED apparatus of the present invention. Thus, the manufacturing processes can be simplified, and the production yield can be enhanced according to the epitaxial substrate, the manufacturing method thereof and the manufacturing method of the LED apparatus of the present invention.
The present invention will become more fully understood from the detailed description given herein below and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements.
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The material of the micro/nano particle 222 includes metal, dielectric material, organic material or inorganic material. The micro/nano particle 222 may be a nano-ball, a nano-column, a nano-hole, a nano-point, a nano-line or a nano-concave-convex structure. Herein, the micro/nano particle 222 is the nano-ball, and the material of the metal oxide 221 includes aluminum oxide.
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It is to be noted that the order of the steps can be changed according to the actual requirement of the manufacturing processes.
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In this embodiment, the first micro/nano structure has a plurality of micro/nano particles including at least one nano-ball, nano-column, nano-hole, nano-point, nano-line or nano-concave-convex structure. Herein, the first micro/nano structure is the nano-ball, and the material of the micro/nano particle may include metal, dielectric material, organic material or inorganic material. The micro/nano particles are arranged in a periodic manner, non-periodic manner, continuous manner, non-continuous manner, gap-free manner, gap-containing manner, equally spaced manner or unequally spaced manner.
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It is to be noted that the order of the above-mentioned steps is not particularly limited and can be changed according to the requirement of the manufacturing processes.
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Herein, the first micro/nano structure has a plurality of micro/nano particles including at least one nano-ball, a nano-column, a nano-hole, a nano-point, a nano-line or a nano-concave-convex structure. In this embodiment, the first micro/nano structure is the nano-ball, and the material of the micro/nano particle includes metal, dielectric material, organic material or inorganic material.
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It is to be noted that the order of the steps can be changed according to the actual requirement of the manufacturing processes.
As mentioned hereinabove, the manufacturing method of the LED apparatus of the present invention can be performed based on the epitaxial substrate in the above-mentioned embodiment. As shown in
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It is to be noted that the thermoconductive adhesive layer 65 can be formed on the thermoconductive substrate 64, the second semiconductor layer 633, or the thermoconductive substrate 64 and the second semiconductor layer 633 simultaneously.
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It is to be noted that the order of the steps can be changed according to the actual requirement of the manufacturing processes.
Herein, the manufacturing method of the LED apparatus is only described according to the above-mentioned examples, wherein the epitaxial substrate used in the manufacturing processes is, for example but not limited to, any one of the epitaxial substrates according to the first to third embodiments, or other epitaxial substrates manufacturing according to the concept of the present invention.
In summary, the epitaxial substrate, the manufacturing method thereof and the manufacturing method of the LED apparatus according to the present invention have the following features. First, the sacrificial layer having the micro/nano structure is disposed on the buffer layer or the substrate. Next, the nano-particles are etched by etching or calcination so that the buffer layer or the substrate has the micro/nano holes. In addition, compared with the prior art, in which the epitaxial substrate is removed by the laser lift-off technology, the epitaxial substrate is removed by etching in the manufacturing method of the LED apparatus of the present invention. Thus, the manufacturing processes can be simplified, and the production yield can be enhanced according to the epitaxial substrate, the manufacturing method thereof and the manufacturing method of the LED apparatus of the invention.
Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.
Number | Date | Country | Kind |
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096137372 | Oct 2007 | TW | national |