WO2016010323A1 - 반도체 적층 구조, 이를 이용한 질화물 반도체층 분리방법 및 장치 - Google Patents
반도체 적층 구조, 이를 이용한 질화물 반도체층 분리방법 및 장치 Download PDFInfo
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Definitions
- the present invention relates to a semiconductor layer of gallium nitride (GaN) or a mixed nitride of gallium and another metal, and a method of forming the same.
- the invention also relates to an electronic or opto-electronic device, a nitride semiconductor substrate and a method of manufacturing the same comprising such a layer.
- the technical field of the present invention can be broadly defined as a semiconductor laminated structure and a method for forming the nitride semiconductor layer of high quality with low crystal defects on a substrate.
- Nitride semiconductors of Group III-V elements on the periodic table occupy an important position in the field of electronic and optoelectronic devices, which will become even more important in the future.
- Applications of nitride semiconductors actually cover a wide range from laser diodes (LDs) to transistors that can operate at high frequencies and temperatures. And an ultraviolet photodetector, a surface acoustic wave device, and a light emitting diode (LED).
- LDs laser diodes
- LED light emitting diode
- gallium nitride is known as a material suitable for the application of blue LEDs or high temperature transistors, but has been widely studied for microwave electronic devices.
- gallium nitride may be widely used as including gallium nitride-based alloys such as aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), and aluminum indium gallium nitride (AlInGaN).
- nitride semiconductors such as gallium nitride
- the most frequently used substrates for the growth of nitride semiconductor layers are "heterogeneous" substrates such as sapphire, silicon carbide (SiC) and silicon.
- SiC silicon carbide
- the nitride semiconductor layer grown on the dissimilar substrate contains a large amount of crystal defects such as dislocations. These defects act as a major factor to degrade the performance of nitride semiconductor devices such as LED.
- the sapphire substrate has a larger coefficient of thermal expansion than gallium nitride
- the gallium nitride epitaxial layer is subjected to compressive stress.
- the silicon substrate has a smaller coefficient of thermal expansion than gallium nitride
- a tensile stress is applied to the gallium nitride epi layer.
- substrate bends and the thickness of a board
- the use of thick substrates only serves to reduce the surface phenomena and is not a technique to reduce the stress itself of the thin film.
- the stress itself of the thin film can be reduced, it is advantageous to be able to use a thin substrate.
- the LED substrate is manufactured to be removed after leaving the substrate about 100 ⁇ m for chip separation, it is possible to use a thin substrate to obtain a big gain in terms of LED production.
- the nitride semiconductor layer formed on the dissimilar substrate may need to be separated from the dissimilar substrate.
- Laser lift off has been proposed in the prior art. However, even when the laser lift-off method is used, the warpage of the substrate occurs due to a difference in thermal expansion coefficient between the sapphire substrate and the nitride semiconductor, or the nitride semiconductor layer is melted and removed using a laser, so that the high heat in the local region is caused. There are side effects that cause thermal stress during the process. Laser lift-off methods involve thermal and mechanical deformation and decomposition of nitride semiconductors. Defects such as cracks are easily generated in the nitride semiconductor layer due to the impact of the laser beam, the nitride semiconductor layer may be damaged, and further, the nitride semiconductor layer is fragile and the process is unstable.
- the problem to be solved by the present invention is to reduce the stress received by the nitride semiconductor layer during growth of the nitride semiconductor layer and to form a high-quality nitride semiconductor layer, as well as a semiconductor laminate structure that is easy to separate from the substrate without the need for laser lift-off, It is to provide a nitride semiconductor layer separation method and apparatus using the same.
- the semiconductor laminated structure according to the present invention is a single crystal substrate of heterogeneous nitride semiconductor;
- An inorganic thin film including a leg portion contacting the substrate and an upper surface portion extending from the leg portion in parallel with the substrate to define a cavity between the substrate and at least partially crystallized in the same crystal structure as the substrate ;
- a nitride semiconductor layer grown from the crystallized inorganic thin film on the empty space.
- the empty spaces may be a plurality of empty spaces separated from each other and may be a line type pattern extending in a direction perpendicular to a direction in which the lateral growth speed of the nitride semiconductor layer is high.
- the nitride semiconductor layer may or may not be coalesced.
- the nitride semiconductor layer may be continuous or discontinuous in the horizontal direction.
- the nitride semiconductor layer may be two or more layers. An inorganic thin film defining such an empty space may be further formed between the two or more films.
- a sacrificial layer pattern is formed on a single crystal substrate different from the nitride semiconductor, and then an inorganic thin film is formed on the sacrificial layer pattern.
- the sacrificial layer pattern is removed from the substrate on which the inorganic thin film is formed so that an empty space defined by the substrate and the inorganic thin film is formed.
- the inorganic thin film is at least partially crystallized in the same crystal structure as the substrate, and a nitride semiconductor layer is grown from the crystallized inorganic thin film on the empty space. Thereafter, mechanically separating the substrate and the nitride semiconductor layer is performed.
- the nitride semiconductor layer may be formed of a plurality of nitride semiconductor layers separated from each other.
- the sacrificial layer pattern may be formed by various methods. After coating the photoresist on the substrate may be formed by a photolithography method, or by applying a nanoimprint resin on the substrate may be formed by a nanoimprint method. Instead, it may be formed by pasting organic nanoparticles on the substrate.
- the forming of the inorganic thin film may be performed within a temperature limit at which the sacrificial layer pattern is not deformed.
- the empty space is a position where the sacrificial layer pattern is removed. Therefore, the empty space follows the shape and size of the sacrificial layer pattern and the two-dimensional arrangement. Therefore, the shape and size of the sacrificial layer pattern and the two-dimensional arrangement must be determined in order for the empty space to have a controlled shape and size and two-dimensional arrangement.
- the semiconductor laminate structure according to the present invention performs a step of mechanically separating the substrate and the nitride semiconductor layer therein.
- another semiconductor stacked structure including an interfacial layer including an empty space between the substrate and the nitride semiconductor layer is used to mechanically connect the substrate and the nitride semiconductor layer therein. To perform the separation step.
- Separation of the nitride semiconductor layer from the substrate using this method can produce vertical or horizontal LEDs, LEDs transferred or transferred to any substrate, or free-standing nitride semiconductor substrates.
- the mechanically separating may include separating the substrate and the nitride semiconductor layer by applying a vertical force, separating the substrate by applying a force in a horizontal direction, and a relative circular force. It can be carried out by the method of separating, and a combination thereof.
- the substrate and the nitride semiconductor layer are separated by applying a vertical force, it is preferable to detect an end point by detecting a thickness or pressure in which the substrate and the nitride semiconductor layer are compressed in the vertical direction. .
- the nitride semiconductor layer separation method according to the present invention may further include transferring or packaging the separated nitride semiconductor layer to another substrate after separation of the substrate and the nitride semiconductor layer.
- the nitride semiconductor layer separating apparatus is a semiconductor laminate structure according to the present invention or a nitride semiconductor in another semiconductor laminate structure including an interfacial layer including an empty space between the substrate and the nitride semiconductor layer even if not according to the present invention. Mechanical separation between the layers.
- Such a device may include a pair of plate-shaped separating members as jig applied to the substrate and the nitride semiconductor layer of the semiconductor laminated structure, respectively.
- the separation member and the semiconductor laminate may be temporarily bonded.
- the temporary adhesion may be any one of an adhesive layer, an adhesive coating, an adhesive tape, an electrostatic force or a force by vacuum.
- the apparatus may include a driver for applying an external force to the semiconductor stacked structure, and a controller for controlling the driver.
- the driving unit may apply an external force of compression, tension, shear, twist, and a combination thereof relative to the substrate and the nitride semiconductor layer.
- the separation device according to the present invention is a jig applied to the substrate and the nitride semiconductor layer of the semiconductor laminated structure, respectively, a pair of plate-like separating members to at least one of the external force is applied to the semiconductor laminate structure in the state of temporary bonding It may be. Any one of the separation members may be fixed and the other may be applied in a vertical direction, a horizontal direction, or a rotational external force with respect to the other.
- one of the separating members is fixed and the other is driven in a direction perpendicular to the other to provide a compressive force, and the compressive force is released immediately after the nitride semiconductor layer and the substrate are separated by the inorganic thin film or interface layer breakage.
- the controller may control the driving unit through end point detection in which the nitride semiconductor layer and the substrate are separated, thereby stopping the relative movement of the separation member or spaced apart from each other.
- the apparatus may further include a separation detecting unit for detecting the endpoint.
- the separation detection unit may be by a distance measurement or pressure monitoring method between the separation member.
- the separation device according to the present invention may further include a device for transporting the separated nitride semiconductor layer for transferring or packaging to another substrate.
- an ultraviolet photodetector By using the semiconductor laminate structure, the nitride semiconductor layer separation method and apparatus using the same, an ultraviolet photodetector, a surface acoustic wave device, an LED, an LD, a microwave electronic device, and the like can be manufactured. Can be extended. In addition, a free standing nitride semiconductor substrate can be produced. Specific details of other embodiments are included in the detailed description and drawings.
- the nitride semiconductor layer grows from the inorganic thin film on the empty space.
- the inorganic thin film can be resolved by dividing the stress with the nitride semiconductor layer growing thereon, and according to the present invention, the nitride semiconductor layer is grown at high quality with a small defect density. Therefore, a high quality nitride semiconductor layer having a small defect density can be formed and the internal quantum efficiency can be increased by reducing the density of nitride semiconductor crystal defects.
- the thermal expansion coefficient between the substrate and the nitride semiconductor layer Due to the difference in thermal expansion coefficient between the substrate and the nitride semiconductor layer, even if stress is generated in the nitride semiconductor layer, local stress relaxation may occur, and thus the substrate warpage may be reduced. Even if the thermal expansion coefficients of the substrate and the nitride semiconductor layer are different, the void space can be compressed or stretched by the nitride semiconductor layer, so that the stress applied to the nitride semiconductor layer is reduced. This makes it possible to use a relatively thin substrate even in a large area substrate.
- the empty space is not formed irregularly or randomly, but is formed by the controlled method.
- the nitride semiconductor epitaxial layer having excellent physical properties can be grown, an optoelectronic device having high efficiency and high reliability can be realized.
- the voids and voids that can be made while forming the nitride semiconductor layer make it easy to physically separate the substrate and the nitride semiconductor layer. It is possible to mechanically separate the nitride semiconductor layer from the substrate by a small physical force or impact without applying a large energy such as a laser. Therefore, it is easy to separate the nitride semiconductor layer from the substrate even without using the laser lift-off, thereby facilitating the manufacture of a vertical LED or a free standing nitride semiconductor substrate.
- the separation method and apparatus since the separation between the substrate and the nitride semiconductor layer by a mechanical force without using a laser, it can shorten the time and reduce the process cost compared to the method using a laser, production The efficiency can be improved.
- the present invention proposes a novel configuration of a method and apparatus for separating between a substrate and a nitride semiconductor layer by a mechanical separation method.
- an inorganic thin film defining an empty space between the substrate and the nitride semiconductor layer, which is an artificial nanostructure that can be easily destroyed, it is possible to separate between the substrate and the nitride semiconductor layer without the need for an expensive laser device and without deterioration caused by laser. Can be.
- the nitride semiconductor layer can be grown continuously or discontinuously, thereby improving the performance of the LED and lowering the production cost.
- FIG. 1 is a view illustrating a semiconductor laminate structure and a method of forming the same according to the present invention.
- FIG. 2 is a view showing a two-dimensional arrangement of the sacrificial layer pattern in the semiconductor laminate structure and method for forming the same according to the present invention.
- FIG. 3 shows various cross sections of an empty space in a semiconductor laminate structure in accordance with the present invention.
- FIG. 4 is a view for explaining the shape of the various sacrificial layer pattern, the resulting upper surface of the inorganic thin film in the method of forming a semiconductor laminate structure according to the present invention.
- FIG 5 illustrates a case in which a part of the nitride semiconductor layer is included in the interface layer portion in the semiconductor laminate structure according to the present invention.
- FIG. 6 is a view for explaining the shape of the upper surface of the nitride semiconductor layer in the semiconductor laminate structure according to the present invention.
- FIG. 7 shows a pair of plate-like separating members included in the nitride semiconductor layer separating apparatus according to the present invention.
- FIG 8 shows another example of the separation member included in the nitride semiconductor layer separation apparatus according to the present invention.
- FIG. 9 is a schematic view of a nitride semiconductor layer separation apparatus according to the present invention.
- FIG. 10 illustrates a case where the nitride semiconductor layer and the substrate are separated in a compressed state using the nitride semiconductor layer separating apparatus according to the present invention.
- FIG 11 illustrates a case where the tensile state nitride semiconductor layer and the substrate are separated using the nitride semiconductor layer separator according to the present invention.
- FIG. 12 illustrates a case where the nitride semiconductor layer and the substrate are separated in a shear state by using the nitride semiconductor layer separating apparatus according to the present invention.
- FIG. 13 illustrates a case where the nitride semiconductor layer and the substrate are separated in a torsion state using the nitride semiconductor layer separating apparatus according to the present invention.
- the present inventors have proposed various research results for relieving stress of the nitride semiconductor layer by crushing the empty space by growing the nitride semiconductor layer after forming the empty space on the dissimilar substrate.
- the nitride semiconductor layer and the substrate are separated from the semiconductor stacked structure formed according to the method proposed by the present inventors, and the vertical or horizontal LED, the LED transferred or transferred to an arbitrary substrate, or the free standing nitride semiconductor or nitride semiconductor substrate.
- FIG. 1 is a view illustrating a semiconductor laminate structure and a method of forming the same according to the present invention.
- a sacrificial layer pattern 20 is formed on a substrate 10.
- the thickness d of the sacrificial layer pattern 20 may be 0.01-10 ⁇ m, and the width w of the sacrificial layer pattern 20 may be 0.01-10 ⁇ m.
- the thickness d and the width w of the sacrificial layer pattern 20 may be determined in consideration of the empty space to be finally formed.
- the sacrificial layer pattern 20 is uniformly formed on the entire substrate 10 in the same pattern. However, the sacrificial layer pattern 20 may be formed in another pattern locally on the substrate 10.
- FIG. 2 is a plan view showing a two-dimensional arrangement of the sacrificial layer pattern 20 and shows a part of the substrate constituting one chip.
- the sacrificial layer pattern 20 formed on the substrate 10 may be a line and space type and may have a shape extending in the y-axis direction or the x-axis direction on the substrate 10.
- the case where the pattern 20 extends in the y-axis direction was taken as an example.
- sacrificial layer patterns 20 enter a chip having a width x length of 1 mm x 1 mm.
- the LED formed therefrom is controlled in light direction in one direction, and thus the polarization direction can be adjusted.
- the sacrificial layer pattern 20 is preferably formed in a line type pattern extending in a direction perpendicular to the direction in which the lateral growth rate of the nitride semiconductor layer to be formed subsequently increases.
- the nitride lateral growth rate is high.
- the direction in which the lateral growth speed of the nitride is faster is ⁇ 1-100>, and thus the sacrificial layer pattern 20 is formed in a line pattern extending along the ⁇ 11-20> direction perpendicular to the substrate. The reason for doing so is to grow the nitride semiconductor layer while maximizing the epitaxial lateral overgrowth (ELO) starting from the substrate 10.
- ELO epitaxial lateral overgrowth
- the line type sacrificial layer pattern 20 may be formed over the entire substrate 10, an island shape in which the pattern and the pattern are spaced apart from each other may be formed.
- the island shape may be preferable in terms of preventing bowing, etc., than the case formed over the entire substrate 10.
- the sacrificial layer pattern 20 may be performed by various methods such as photolithography, nano-imprint, and organic nanoparticle attachment. As described above, according to the present invention, the method of forming the sacrificial layer pattern 20 is relatively simple, and the degree of damage to the substrate is relatively small and the process is relatively small compared to the case of etching the substrate in a conventional technique such as a patterned sapphire substrate (PSS). Can be simplified.
- PPS patterned sapphire substrate
- the substrate 10 on which the various sacrificial layer patterns 20 are formed all hetero-single crystal substrates used to grow hetero epitaxial layers of nitride semiconductor layers such as sapphire, silicon, SiC, and GaAs substrates may be used. It is preferable that it is a sapphire substrate.
- the inorganic thin film 30 is formed on the sacrificial layer pattern 20 with reference to FIG. 1B.
- the inorganic thin film 30 subsequently defines an empty space with the substrate 10.
- the inorganic thin film 30 is preferably performed within a temperature limit at which the sacrificial layer pattern 20 is not deformed. .
- the inorganic thin film 30 has a thickness that allows the structure to be stably maintained after the sacrificial layer pattern 20 is removed. Processes for forming the inorganic thin film 30 may be various methods such as atomic layer deposition (ALD), wet synthesis, metal deposition and oxidation, sputtering.
- the inorganic thin film 30 includes silica (SiO 2 ), alumina (Al 2 O 3 ), titania (TiO 2 ), zirconia (ZrO 2 ), yttria (Y 2 O 3 ) -zirconia, copper oxide (CuO, Cu 2 O) and tantalum oxide (Ta 2 O 5 ), aluminum nitride (AlN), silicon nitride (Si 3 N 4 ) such as at least one of an oxide or a nitride, in this embodiment, preferably alumina.
- the inorganic thin film 30 is formed on the entire surface of the substrate 10 while covering the sacrificial layer pattern 20 as shown.
- the alumina may be formed in a uniform thickness along the shape of the substrate 10 and the sacrificial layer pattern 20 by a deposition method such as ALD.
- a wet synthesis method using a wet solution is also possible.
- the alumina may be synthesized by heating, drying, or chemical reaction.
- an aluminum precursor powder such as aluminum chloride (AlCl 3 ) is mixed with a solvent such as tetrachloroethylene (C 2 Cl 4 ), and then applied to the substrate 10 on which the sacrificial layer pattern 20 is formed to be coated and oxygen atmosphere.
- alumina thin film When heated and reacted at, the alumina thin film can be coated.
- alumina may be formed by depositing a metal Al thin film by sputtering or the like and then performing an oxidation process. Such alumina is formed in a state consisting of polycrystals of amorphous or fine particles.
- the sacrificial layer pattern 20 is selectively removed from the substrate 10 as shown in FIG. 1C. Since the sacrificial layer pattern 20 is a polymer such as a photosensitive film, a resin for nanoimprint, or an organic nanoparticle, a method of easily removing the sacrificial layer pattern 20 is heating. Photoresist films with spontaneous flash points usually around 600 ° C can be easily removed by heat. And in order to burn more easily by the oxidation method, a chemical reaction with a gas containing oxygen may be added. Heating to a high temperature in an oxygen atmosphere makes it easy to remove polymer components by a pyrolysis process, commonly called ashing. For example, it is removed by heat treatment in an oxygen atmosphere.
- a pyrolysis process commonly called ashing. For example, it is removed by heat treatment in an oxygen atmosphere.
- an empty space C defined by the substrate 10 and the inorganic thin film 30 may be formed.
- a plurality of empty spaces C separated from each other are formed, but the shape of the empty spaces may vary depending on the shape of the sacrificial layer pattern 20 formed at first.
- the empty space has a shape in which the sacrificial layer pattern is inverted.
- the as-deposited inorganic thin film 30 usually has polycrystals which are usually amorphous or of very small particles. After the empty space C is formed by removing the sacrificial layer pattern 20, heat treatment is preferably performed to densify and crystallize the amorphous or polycrystalline inorganic thin film 30.
- the heat treatment of the sacrificial layer pattern 20 and the heat treatment of the inorganic thin film 30 may be performed by increasing the temperature stepwise or by a continuous process.
- the inorganic thin film 30 is made of the same composition as the substrate 10.
- the inorganic thin film 30 becomes an inorganic thin film 30 'crystallized in the same crystal structure as the substrate 10 as shown in FIG. As a result, the interface between the crystallized inorganic thin film 30 ′ and the substrate 10 (indicated by a dotted line in the drawing) disappears.
- Such crystallization may occur over at least a portion of the inorganic thin film 30, especially the entirety, and the portion of the crystallized inorganic thin film 30 'above the empty space C may be used as a seed portion during the later growth of the nitride semiconductor epitaxial layer. Since the function of the inorganic thin film 30 'on the empty space (C) must be crystallized.
- a nitride semiconductor layer 50 is further formed on the crystallized inorganic thin film 30 ′.
- the nitride semiconductor layer 50 may be formed in a multilayer structure including an appropriate buffer layer.
- the nitride semiconductor layer 50 includes all nitride semiconductor materials, such as Ga x Al y In z N (0 ⁇ x, y, z ⁇ 1), which is GaN, InN, AlN, or a combination thereof.
- the band gap may be adjusted according to the material of the nitride semiconductor layer 50 to emit light in the ultraviolet, visible and infrared regions.
- the nitride semiconductor layer 50 is not grown on the substrate 10, but seeds are grown from the crystallized inorganic thin film 30 'portion over the empty space C (Fig. 1 (e) left side) ).
- the nitride semiconductor layer 50 may be grown in the crystallized inorganic thin film 30 ′ on the empty space C by adjusting the deposition temperature, the pressure of the gas, the flow rate, and the like.
- the parts grown therefrom are coalesced to form a thin film, and voids V may be formed in a region between the empty spaces C (Fig. 1 (e) right).
- growth may be terminated before the nitride semiconductor layer 50 is incorporated. That is, the nitride semiconductor layer 50 is formed of a plurality of nitride semiconductor layers separated from each other according to the epitaxial growth time control.
- the void V may not be formed.
- the nitride semiconductor layer may be formed continuously or discontinuously in the horizontal direction if some are coalesced and some are not coalesced by adjusting the distance between the empty spaces C.
- FIG. A portion including the inorganic thin film 30 ', the empty space C, and the optional void V will be referred to herein as an "interface layer".
- the nitride semiconductor layer 50 may be formed of a plurality of nitride semiconductor layers separated from each other.
- the nitride semiconductor layer 50 grows on the substrate 10 between the empty spaces C, then a film grows on the substrate 10 by ELO and is overgrown in the transverse direction over the empty spaces C to merge. Will be done. However, in the present invention, since the nitride semiconductor layer 50 grows from the portion of the crystallized inorganic thin film 30 'on the empty space C rather than from the substrate 10, the nitride semiconductor layer ( 50) is formed.
- the inorganic thin film 30 'crystallized in accordance with the present invention can be solved by dividing the stress with the nitride semiconductor layer 50 growing thereon to act as a compliant layer, the stress that can generate dislocations is eliminated As it grows, it grows with high quality with small defect density.
- the stress due to the physical difference between the substrate and the thin film becomes a driving force that is converted into elastic energy at the interface to generate dislocations.
- the thickness of the substrate is considerably thicker than the thin film, the deformation is difficult. Instead, the stress is released as the dislocation is generated in the thin film.
- the elastic energy at the interface becomes larger than the generated energy of the dislocation so that dislocations start to occur.
- the critical thickness is larger, so that the potential generation of the nitride semiconductor layer 50 is reduced.
- the inorganic thin film 30 ' is sufficiently thinner than the nitride semiconductor layer 50, it can be said that the roles of the substrate and the thin film are changed in a normal case, and the nitride semiconductor layer 50 grows in a state in which dislocations are generated less. Done. Therefore, since the high quality nitride semiconductor layer 50 having a small defect density can be formed and the nitride semiconductor crystal defect density is reduced, the internal quantum efficiency can be increased when manufacturing the LED.
- the semiconductor stacked structure 100 according to the present invention formed by the above method includes a single crystal substrate 10 heterogeneous with a nitride semiconductor and a crystallized inorganic thin film 30 ′ as shown in the right figure of FIG. do. Between the substrate 10 and the inorganic thin film 30 ′, a plurality of empty spaces C separated from each other are defined to have a controlled shape and size and a two-dimensional arrangement. The semiconductor stacked structure 100 also grows and coalesces on the crystallized inorganic thin film 30 'above the void space C to form voids V in the regions between the void spaces C. ).
- the inorganic thin film 30 ′ includes a leg portion 30a contacting the substrate 10 and an upper surface portion 30b extending from the leg portion 30a and parallel to the substrate 10.
- the empty space C is a place where the sacrificial layer pattern 20 is removed during the formation method. Therefore, the empty space C follows the shape and size of the sacrificial layer pattern 20 and the two-dimensional arrangement. Therefore, in order for the empty space C to have a controlled shape and size and two-dimensional arrangement, the shape and size and two-dimensional arrangement of the sacrificial layer pattern 20 must be determined.
- the empty space C is uniformly defined in the same pattern on the entire substrate 10 according to the design of the sacrificial layer pattern 20. However, the empty space may be defined as another pattern locally on the substrate according to the design of the sacrificial layer pattern.
- the void space C exists, if there is a difference in thermal expansion coefficient between the substrate 10 and the nitride semiconductor layer 50 formed thereon, the void space C is stretched or compressed in the plane direction to cause local deformation. Stress energy can be consumed. As a result, thermal stress applied to the nitride semiconductor layer 50 may be reduced, and thus the warpage phenomenon of the substrate 10 may be reduced. This makes it possible to use a relatively thin thickness even if the substrate 10 has a large area.
- the empty space C can be controlled by adjusting the shape, size, two-dimensional arrangement, etc. of the sacrificial layer pattern, the optical characteristics of the LED manufactured from the semiconductor stacked structure 100, for example, the emission pattern can be adjusted. have.
- the empty space C is formed in a controlled manner rather than irregularly or randomly, since the sacrificial layer pattern 20 is formed by a controlled method such as photolithography or nanoimprint, reproducibility is good and device uniformity is formed. great.
- nitride semiconductor layer 50 having excellent physical properties can be epitaxially grown, an optoelectronic device having high efficiency and high reliability can be realized.
- high-output LD and LED may be implemented according to an increase in light extraction efficiency.
- the substrate 10 and the nitride semiconductor layer 50 are connected to each other with the interface layer interposed therebetween. Since the interface layer is physically separated from the substrate 10 and the nitride semiconductor layer 50 to some extent due to the empty space C and the optional void V, the stress generation is further suppressed.
- the nitride semiconductor layer 50 and the substrate 10 may be separated by the separation method and apparatus according to the present invention as shown in FIG.
- the nitride semiconductor layer is grown on the substrate according to the conventional art, a special process such as laser lift-off is required to separate the nitride semiconductor layer from the substrate since the nitride semiconductor layer and the substrate are bonded at the atomic level.
- the inorganic thin film 30 ' such as a membrane or a bridge exists in the interface layer, even if the laser lift-off is not used, the inorganic thin film 30' may be collapsed or the inorganic thin film 30 may be reduced by a small mechanical force.
- the substrate 10 interface are separated to facilitate the separation of the nitride semiconductor layer 50 from the substrate 10. Since it is separated even by a small mechanical force such as tension or compression, the nitride semiconductor layer 50 can be separated without bending, cracking or breaking.
- the substrate 10 is very advantageous for the manufacture of applications requiring separation of the substrate 10 and the nitride semiconductor layer 50, such as vertical LEDs or horizontal LEDs, LEDs transferred to any substrate, and the substrate 10 is easy to recycle.
- the nitride semiconductor layer 50 is formed into a thick film to be separated from the substrate 10 or used as a free standing nitride semiconductor substrate, it is easy to manufacture a nitride semiconductor substrate as a homogeneous substrate for excellent nitride semiconductor growth.
- the shape of the interfacial layer may be configured in various ways depending on the shape of the sacrificial layer pattern 20.
- the sacrificial layer pattern 20 having a rectangular cross section perpendicular to the substrate 10 is formed, so that the empty space C defined by the inorganic thin film 30 ′ also has a rectangular cross section.
- the cross section of the empty space C may be a trapezoidal shape having a wider lower surface than (a) a square or (b) an upper surface, or conversely, a lower surface of a lower surface than an upper surface (c).
- the inorganic thin film 30 has legs and contacts that contact the substrate and have a top surface parallel to the substrate, and the legs have a vertical or predetermined inclination with the substrate.
- the upper surface portion does not necessarily have to be parallel to the substrate.
- the top surface may have a curved surface such as convex or concave, or may not have a top surface, such as when the hollow space cross section is a triangle.
- the legs also do not have to be straight.
- the legs may also have a curved surface such as convex or concave, and may be straight but may change inclination with the substrate.
- the sacrificial layer pattern 20 is a line and space type, but as shown in various examples of FIG. 4, the sacrificial layer pattern may have various shapes.
- FIG. 4 is a view for explaining the shape of the various sacrificial layer pattern, the resulting upper surface of the inorganic thin film in the method of forming a semiconductor laminate structure according to the present invention.
- b 'and d may be the same or different.
- (d) is a group (G2) formed of a rectangular pattern having different horizontal and vertical lengths of "a" and "a '" with x pitch of "b'" and y pitch of "d". It is formed uniformly at y pitch "c '".
- b 'and d may be the same or different.
- the nitride semiconductor layer 50 ' is also formed in the inorganic thin film 30' portion between the empty spaces C while the nitride semiconductor layer 50 is formed in step (e) described with reference to FIG. Can be formed.
- the nitride semiconductor layer 50 grown on the upper surface of the inorganic thin film 30 ' is coalesced before the nitride semiconductor layer 50' grows and passes over the upper surface of the inorganic thin film 30 ', as shown in FIG.
- the nitride semiconductor layer 50 ′ is partially filled between the empty spaces C, and a void V is formed between the nitride semiconductor layer 50 and the upper portion thereof.
- FIG. 6 is a view for explaining the shape of the upper surface of the nitride semiconductor layer in the semiconductor laminate structure according to the present invention.
- growth may be terminated in step (e) described with reference to FIG. 1 before the nitride semiconductor layer 50 is incorporated.
- the nitride semiconductor layer 50 is then formed of a plurality of nitride semiconductor layers separated from each other.
- FIG. 6A illustrates a case where growth is terminated before the nitride semiconductor layer 50 is coalesced while using the sacrificial layer pattern 20 of FIG. 4A.
- a plurality of square nitride semiconductor layers can be obtained.
- FIG. 6B illustrates a case where growth is terminated before the nitride semiconductor layer 50 is coalesced while using the sacrificial layer pattern 20 as illustrated in FIG. 4C.
- a plurality of rectangular nitride semiconductor layers can be obtained.
- the shape of the sacrificial layer pattern 20 is different, the shape of the empty space C is changed and is The shape of the inorganic thin film 30 ′ serving as the seed layer is changed, and thus the configuration in which the shape of the nitride semiconductor layer 50 formed thereon is changed may be used.
- the nitride semiconductor layer 50 may be formed of a plurality of nitride semiconductor layers separated from each other, and when the nitride semiconductor layer 50 is formed in a multi-layer structure including an active layer required for LED configuration when the nitride semiconductor layer 50 is manufactured, the nitride semiconductor layers 50 may be separated from each other. Since the plurality of nitride semiconductor layers 50 are already manufactured in a chip unit and separated from each other, dicing required for fabrication of a chip unit when separating from the substrate 10 by the nitride semiconductor layer separation method according to the present invention ( There is an advantage that it can be directly put into the package process without device individualization process such as dicing).
- the method for separating a nitride semiconductor layer according to the present invention may include the semiconductor laminate structure 100 according to the present invention, or another semiconductor laminate structure in which an interfacial layer including an empty space is formed between a substrate and a nitride semiconductor layer as in the present invention.
- the first method is possible in two ways, a compressed state and a tensioned state.
- the compression is performed by pressing the upper and lower surfaces to destroy the inorganic thin film or the interface layer.
- the tensile state is a method performed by breaking the inorganic thin film or the interfacial layer by separating the upper and lower surfaces apart.
- the second method is a shear state method performed by breaking an inorganic thin film or an interfacial layer by a shear force that moves the upper and lower surfaces in a horizontal direction relative to each other.
- the third method is a twisting method performed by destroying an inorganic thin film or an interfacial layer by twisting the upper and lower surfaces relative to each other and relatively horizontally circularly moving.
- the reason why the mechanical force can be separated without using a method such as laser irradiation includes the void space (C) and the optional void (V) in the semiconductor laminate structure 100 or another semiconductor laminate structure according to the present invention. This is because of the interfacial layer.
- the nitride semiconductor layer separation apparatus according to the present invention is suitable for implementing such a separation method.
- the substrate 10 and the nitride semiconductor layer 50 are separated by using the semiconductor stack structure 100 according to the present invention is illustrated as an example, but a structure different from the semiconductor stack structure 100 includes empty spaces.
- the interfacial layer is a semiconductor laminate structure formed between the substrate and the nitride semiconductor layer, it can be mechanically separated using the separation method and apparatus according to the present invention.
- the separator according to the present invention includes a pair of plate-shaped separating members 210 and 220 as jig applied to the upper and lower surfaces of the semiconductor stacked structure 100, respectively.
- the first separating member 210 is disposed on the bottom surface of the semiconductor stacked structure, that is, the substrate 10 side.
- the second separating member 220 is disposed on the upper surface of the semiconductor stacked structure, that is, the nitride semiconductor layer 50.
- the temporary separation may be performed between the first separation member 210 and the substrate 10.
- the second separation member 220 and the nitride semiconductor layer 50 may also be temporarily bonded. It may simply be contact without adhesion. By temporary it is meant herein that the separation step is present while being carried out and subsequently removed.
- Temporary adhesion can be a variety of methods, such as adhesive layer, adhesive coating, adhesive tape, electrostatic force, vacuum force.
- the pair of separating members 210 and 220 may be larger than the semiconductor laminate structure 100 or smaller than the semiconductor laminate structure 100 so as to cover the semiconductor laminate structure 100.
- FIG. 8 illustrates another example of the separating members 210 and 220 included in the nitride semiconductor layer separating apparatus according to the present invention.
- the separating members 210 and 220 may be generally plate-shaped, but a mounting groove S may be formed therein in which the semiconductor stack structure 100 may be seated.
- a vacuum supply hole may be further formed to provide a vacuum force for adsorbing the semiconductor stacked structure 100 through the mounting groove S.
- the size of the mounting groove S may be the same as that of the semiconductor laminate structure 100, but may be formed relatively larger than the size of the semiconductor laminate structure 100. In this case, the mounting groove S may seat various semiconductor stack structures regardless of the size and shape of the semiconductor stack structure.
- the vacuum supply hole is formed through the seating groove, and supplies a vacuum through the through hole. Therefore, the semiconductor stack structure 100 seated in the seating groove S is absorbed and fixed so as not to move.
- the vacuum supply hole is connected to a vacuum supply line connected to the vacuum pump to provide a vacuum supplied from the vacuum pump.
- the vacuum supply hole may be formed in various patterns, it is radial to adsorb the entire surface of the semiconductor stack 100 evenly or to adsorb the semiconductor stack of various sizes irrespective of the size of the semiconductor stack 100. It can be formed in a pattern.
- the mounting groove S may be formed only in any one of the separating members 210 and 220.
- the pair of separation members 210 and 220 may include a driving unit 230 and a control unit 240 for applying an external force as shown in FIG. 9 while supporting the semiconductor stack structure 100 therebetween. Can be introduced. In this case, a temporary adhesive layer may be interposed therebetween so that the separating members 210 and 220 can support the semiconductor stack structure 100 well.
- the first separation member 210 may be introduced to the separation device 200 first, followed by the semiconductor stack 100, and the second separation member 220 may be sequentially introduced.
- Separator 200 may further include a suitable base member and holding member to support or hold the separation member (210, 220) to be introduced.
- the pair of separation members 210 and 220 may be configured as part of the separation device 200.
- the semiconductor stacked structure 100 is placed on the first separating member 210, and the second separating member 220 is moved to the semiconductor stacked structure 100 to move the semiconductor stacked structure 100 by the separating members 210 and 220.
- the second separation member 220 is spaced apart from the semiconductor stack 100, and the first separation member 210 supports the semiconductor stack 100. .
- Electrostatic force and vacuum force may be preferable for the separating members 210 and 220 to support the semiconductor stack structure 100 so that absorption / desorption is easy according to current on / off.
- the separator 200 may further include various components such as an electrostatic charge generator and a vacuum pump.
- Separator 200 is at least one of the compression, tension, shear, twist state relative to the pair of separation members (210, 220) for mechanical separation between the substrate 10 and the nitride semiconductor layer 50, Or a combination thereof. Since these states are implemented by the relative movement of the separating members 210 and 220, any one of the separating members 210 and 220 may be fixed and the external force may be applied by the driving unit 230 to the other. Preferably, it may be preferred in terms of stability that the separating member placed on the lower side is fixed. In the present exemplary embodiment, the separating member disposed below the first separating member 210 contacting the substrate 10 will be described as an example. However, the second separating member 220 contacting the nitride semiconductor layer 50 may be disposed below. It may be.
- the driving unit 230 includes driving means for driving the second separating member 220 placed on the upper side of the separating members 210 and 220 disposed to face each other in the vertical direction.
- the driving means is, for example, an air cylinder, pneumatic, electric motor or hydraulic motor, and drives the second separation member 220 in the vertical direction (up and down direction) until the substrate 10 and the nitride semiconductor layer 50 are separated. Let's do it.
- the driving unit 230 provides a compression force by driving the second separation member 220 downward.
- FIG. 10A illustrates a case where the nitride semiconductor layer 50 and the substrate 10 are separated by a compressed state.
- FIG. 10B illustrates a case where the nitride semiconductor layer 50 and the substrate 10 are separated by breaking the inorganic thin film 30 '.
- the force to be pushed down by the second separating member 220 must be released to release the nitride semiconductor layer 50. It can prevent breakage.
- a portion of the broken inorganic thin film 30 ′ may be attached to the nitride semiconductor layer 50.
- end point detection is required, and the controller 240 controls the driving unit 230 when the end point is detected to stop the movement of the second separating member 220 in the above state or upwards. Spaced apart. Endpoint detection can be implemented as the following method and apparatus.
- the separation degree of the nitride semiconductor layer 50 and the substrate 10 may be sensed in various ways.
- the separation degree of the nitride semiconductor layer 50 and the substrate 10 may be sensed by measuring the distance (which may be converted into a compressive thickness) between the separating members 210 and 220.
- the separation detecting unit 250 may be attached to any position as long as it can measure the distance between the separating members 210 and 220.
- the separation detecting unit 250 may be used without limitation as long as it can measure the distance between two objects spaced apart from each other, such as a laser sensor, a capacitive sensor, an encoder, and the like in real time.
- the initial state in which the semiconductor laminate structure 100 is sandwiched between the separating members 210 and 220 is regarded as a starting point, and the second separating member 220 is formed at a portion where the inorganic thin film 30 ′ is formed, that is, below the thickness of the interface layer. If the moving point moves downward when the nitride semiconductor layer 50 and the substrate 10 are determined to be separated, the control unit 240 separates the second separation until the separating members 210 and 220 move to the separating point position.
- the driving unit 230 is controlled so as to gradually increase or apply a constant pressure to the member 220, and after reaching the separation point position, completely release the pressing force or lift the second separation member 220 upward. By controlling the driving of the second separation member 220.
- the pressurization pressure may be adjusted according to the degree of separation of the nitride semiconductor layer 50 and the substrate 10, and an excessive pressure is applied in the compressed state so that the nitride semiconductor layer ( 50) can be prevented from being damaged.
- the separation detecting unit 250 may also be implemented by a pressure monitoring method. This uses the principle that the pressure gradually increases while the inorganic thin film 30 'withstands the compressive force, and then a sudden pressure change occurs when the inorganic thin film 30' is destroyed by the compressive force.
- the separation detecting unit 250 is configured to monitor the pressure applied to the inorganic thin film 30 '.
- the separation detecting unit 250 at this time takes a load cell configuration.
- the load cell may be mounted on any one of the separating members 210 and 220 or by implementing one of the separating members 210 and 220 as the load cell itself.
- the load cell is a device that monitors the pressure change according to the applied compressive force.
- the load cell determines that the nitride semiconductor layer 50 and the substrate 10 are separated from the moment when the pressure is released or rapidly changes through the load cell. After reaching, the driving force of the second separating member 220 is adjusted by releasing the pressing force completely or controlling the driving unit 230 to lift the second separating member 220 upward.
- FIG. 11A illustrates a case where the nitride semiconductor layer 50 and the substrate 10 are separated by a tensile state using the nitride semiconductor layer separator according to the present invention.
- the tensile state is a method performed by breaking apart the inorganic thin film 30 'by separating the separation members 210 and 220 away from each other.
- the tensile force may be applied until the nitride semiconductor layer 50 and the substrate 10 are separated, that is, the separation members 210 and 220 are separated from each other before the separation starts. At this time, endpoint detection is not an essential configuration.
- FIG. 11B illustrates a case where the nitride semiconductor layer 50 and the substrate 10 are separated by the tensile state. In this case, the inorganic thin film 30 ′ may partially accompany the nitride semiconductor layer 50 or remain on the substrate 10.
- FIG. 12A illustrates a case where the nitride semiconductor layer 50 and the substrate 10 are separated by a shear state by using the nitride semiconductor layer separating apparatus according to the present invention.
- the shear force may be applied until the nitride semiconductor layer 50 and the substrate 10 are separated by breaking the inorganic thin film 30 ', that is, until the relative horizontal movement between the separating members 210 and 220 occurs. . Even at this time, endpoint detection is not an essential configuration.
- 12B illustrates a case where the nitride semiconductor layer 50 and the substrate 10 are separated by the shear state. In this case, the inorganic thin film 30 ′ may partially accompany the nitride semiconductor layer 50 or remain on the substrate 10.
- the driving unit 230 is a force that twists the second separating member 220 with respect to the first separating member 210 or perpendicular to the second separating member 220. It provides the rotational force about the axis.
- FIG. 13A illustrates a case where the nitride semiconductor layer 50 and the substrate 10 are separated by the twisted state using the nitride semiconductor layer separating apparatus according to the present invention. The rotational force may be applied until the nitride semiconductor layer 50 and the substrate 10 are separated by breaking the inorganic thin film 30 ', that is, until the relative circular motion between the separating members 210 and 220 is possible. Also in this case, endpoint detection is not an essential configuration.
- FIG. 13B illustrates a case where the nitride semiconductor layer 50 and the substrate 10 are separated by the twisted state. In this case, the inorganic thin film 30 ′ may partially accompany the nitride semiconductor layer 50 or remain on the substrate 10.
- the nitride semiconductor layer 50 separated by the separation method and the apparatus 200 passes through a predetermined process for removing a portion or fragment of the inorganic thin film 30 ', or is transferred to another substrate without such a process to form an element.
- the process may be performed in a furnace, and may be directly added to a package process without a dicing process if it is manufactured and separated.
- the separating device 200 carries the separated nitride semiconductor layer to a next destination (not shown). And an apparatus (not shown) for removing a portion or a fragment of the inorganic thin film 30 ′ attached to the nitride semiconductor layer 50.
- the second separating member 220 facing downward is inverted and then temporarily released to release the nitride semiconductor layer 50.
- a reverse device configuration may not be necessary.
- the remaining substrate 10 may be recycled for growth of another nitride semiconductor layer.
- the semiconductor stack structure 100 and the separated substrate 10 and the nitride semiconductor layer 50 may be transported by a transport mechanism including a transport arm.
- the substrate and the nitride semiconductor layer can be separated by a small mechanical force without using a high density high output energy such as a laser.
- the process and device configuration is simple and the process time is short.
- the device is economical because it does not create a vacuum or specific gas atmosphere and does not require a closed chamber space. Fabrication of LEDs or nitride semiconductor substrates transferred to vertical, horizontal, or arbitrary substrates that require nitride semiconductor layer separation because they are methods and devices that can be economically separated from the substrate without affecting the already grown nitride semiconductor layer. Highly useful in such fields.
- separating the nitride semiconductor layer it is easy to remove heat generated when driving the device, and when there is a substrate, it has the advantage of taking out the light that cannot be trapped inside the substrate and out of it, and is useful as a homogeneous substrate for nitride semiconductor growth. There is.
- FIG. 14 (a) is an SEM image showing an empty space and an alumina thin film formed on the sapphire substrate in this manner.
- a GaN layer was grown on the alumina thin film.
- the GaN layer was selectively grown from the alumina thin film on the empty space by controlling the growth temperature, gas flow rate, and pressure to obtain a GaN layer as shown in FIG.
- the GaN layer was selectively grown in an empty space portion instead of a substrate portion, and some GaN layers were formed and voids were formed between the empty spaces as shown in FIG. 5.
- Figure 15 (a) is a SEM photograph of the GaN layer after separation and (b) is a SEM photograph of the substrate. As shown in FIG. 15, the GaN layer and the sapphire substrate can be successfully separated through mechanical separation.
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Abstract
Description
Claims (27)
- 질화물 반도체와 이종인 단결정 기판;상기 기판과의 사이에 빈 공간(cavity)이 정의되도록 상기 기판 상에 형성되고 상기 기판과 같은 결정 구조로 적어도 일부 결정화된 무기물 박막; 및상기 빈 공간 위의 상기 결정화된 무기물 박막 상에서부터 성장된 질화물 반도체층을 포함하는 반도체 적층 구조.
- 제1항에 있어서, 상기 질화물 반도체층은 합체되어 있거나 합체되어 있지 않은 것을 특징으로 하는 반도체 적층 구조.
- 제1항에 있어서, 상기 질화물 반도체층은 수평 방향으로 연속적이거나 불연속적인 것을 특징으로 하는 반도체 적층 구조.
- 제1항에 있어서, 상기 질화물 반도체층은 상기 빈 공간 사이의 영역에 보이드(void)를 형성하는 것을 특징으로 하는 반도체 적층 구조.
- 제1항에 있어서, 상기 무기물 박막은 기판과 접촉하는 다리부 및 다리부로부터 연장된 상면부를 포함하는 것을 특징으로 하는 반도체 적층 구조.
- 제5항에 있어서, 상기 상면부는 상기 기판과 평행한 면 또는 곡면을 가지고, 상기 다리부는 상기 기판과 수직이거나 소정의 기울기를 가지거나 곡면을 가지는 것을 특징으로 하는 반도체 적층 구조.
- 제1항에 있어서, 상기 질화물 반도체층은 서로 분리된 복수개의 질화물 반도체층으로 형성되는 것을 특징으로 하는 반도체 적층 구조.
- 질화물 반도체와 이종인 단결정 기판 상에 희생층 패턴을 형성하는 단계;상기 희생층 패턴 상에 무기물 박막을 형성하는 단계;상기 기판과 무기물 박막으로 정의되는 빈 공간(cavity)이 형성되도록, 상기 무기물 박막이 형성된 상기 기판으로부터 상기 희생층 패턴을 제거하는 단계;상기 기판과 같은 결정 구조로 상기 무기물 박막을 적어도 일부 결정화시키는 단계; 및상기 빈 공간 위의 상기 결정화된 무기물 박막 상에서부터 질화물 반도체층을 성장시키는 단계를 포함하여 반도체 적층 구조를 형성한 후,상기 기판과 상기 질화물 반도체층 사이를 기계적으로 분리시키는 단계를 포함하는 질화물 반도체층 분리방법.
- 제1항 기재의 반도체 적층 구조에서 기판과 질화물 반도체층 사이를 기계적으로 분리시키는 단계를 포함하는 질화물 반도체층 분리방법.
- 제8항에 있어서, 상기 질화물 반도체층을 성장시키는 단계에서 상기 질화물 반도체층은 서로 분리된 복수개의 질화물 반도체층으로 형성하는 것을 특징으로 하는 질화물 반도체층 분리방법.
- 제8항 또는 제9항에 있어서, 상기 기계적으로 분리시키는 단계는, 상기 기판과 질화물 반도체층에 수직 방향 힘을 주어 분리하는 방법, 수평 방향의 힘을 주어 분리하는 방법, 상대적인 원운동의 힘을 주어 분리하는 방법, 및 그 조합의 방법으로 수행하는 것을 특징으로 하는 질화물 반도체층 분리방법.
- 제11항에 있어서, 상기 기판과 질화물 반도체층이 수직 방향으로 압축되는 두께 또는 압력을 감지하여 종말점 검출하는 것을 특징으로 하는 질화물 반도체층 분리방법.
- 제11항에 있어서, 상기 기판과 질화물 반도체층 분리 후, 상기 분리된 질화물 반도체층을 다른 기판으로 전사하거나 패키징하는 단계를 더 포함하는 질화물 반도체층 분리방법.
- 제1항 기재의 반도체 적층 구조 또는 기판과 질화물 반도체층 사이에 빈 공간을 포함하는 계면층이 포함된 다른 반도체 적층 구조에서 상기 기판과 질화물 반도체층 사이를 기계적으로 분리시키는 단계를 수행하는 질화물 반도체층 분리장치.
- 제14항에 있어서, 상기 반도체 적층 구조의 기판과 질화물 반도체층에 각각 적용되는 치구로서 한 쌍의 판상 분리부재를 포함하는 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제15항에 있어서, 상기 분리부재와 상기 반도체 적층 구조 사이는 일시적인 접착이 되는 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제16항에 있어서, 상기 일시적인 접착은 접착층, 접착 코팅, 접착테이프, 정전기적인 힘 또는 진공에 의한 힘 중 어느 하나인 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제15항에 있어서, 상기 분리부재 중 적어도 어느 하나에는 안착홈이 형성되고, 상기 안착홈을 통하여 상기 반도체 적층 구조를 흡착하기 위한 진공력을 제공할 수 있도록 진공 공급홀이 더 형성되어 있는 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제14항에 있어서, 상기 반도체 적층 구조에 외력을 인가하는 구동부; 및상기 구동부를 제어하는 제어부를 포함하는 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제19항에 있어서, 상기 구동부는 상기 기판과 질화물 반도체층에 상대적인 압축, 인장, 전단, 비틀음 및 그 조합의 외력을 인가하는 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제20항에 있어서, 상기 반도체 적층 구조의 기판과 질화물 반도체층에 각각 적용되는 치구로서 한 쌍의 판상 분리부재를 적어도 어느 한쪽에는 상기 반도체 적층 구조와 일시적 접착을 한 상태에서 상기 외력을 인가하는 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제21항에 있어서, 상기 분리부재 중 어느 한쪽은 고정하고 다른 한쪽을 나머지에 대해 수직 방향, 수평 방향 또는 회전 외력을 인가하는 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제21항에 있어서, 상기 분리부재 중 어느 한쪽은 고정하고 다른 한쪽을 나머지에 대해 수직 방향으로 구동시켜 압축력을 제공하고, 무기물 박막 또는 계면층 파괴로 상기 질화물 반도체층과 기판이 분리된 직후에 압축력을 해제하는 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제23항에 있어서, 상기 제어부는 상기 질화물 반도체층과 기판이 분리되는 종말점 검출을 통해 상기 구동부를 제어하여 상기 분리부재의 상대적 이동을 멈추거나 서로에 대해 이격시키는 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제24항에 있어서, 상기 종말점 검출을 위한 분리감지부를 더 포함하는 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제25항에 있어서, 상기 분리감지부는 분리부재 사이의 거리 측정 또는 압력 모니터링 방법에 의한 것을 특징으로 하는 질화물 반도체층 분리장치.
- 제14항에 있어서, 상기 분리된 질화물 반도체층을 다른 기판으로 전사하거나 패키징하기 위해 운반하는 장치를 더 포함하는 것을 특징으로 하는 질화물 반도체층 분리장치.
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US15/325,984 US10205052B2 (en) | 2014-07-14 | 2015-07-13 | Semiconductor stacking structure, and method and apparatus for separating nitride semiconductor layer using same |
CN201580048456.8A CN106688113B (zh) | 2014-07-14 | 2015-07-13 | 半导体层叠结构以及使用半导体层叠结构分离氮化物半导体层的方法和装置 |
JP2017523748A JP6683382B2 (ja) | 2014-07-14 | 2015-07-13 | 半導体積層構造、これを用いた窒化物半導体層の分離方法及び装置 |
DE112015003254.1T DE112015003254B4 (de) | 2014-07-14 | 2015-07-13 | Halbleiterstapelstruktur und Verfahren und Einrichtung zum Separieren einer Nitridhalbleiterschicht unter Verwendung derselben |
US16/271,102 US10916681B2 (en) | 2014-07-14 | 2019-02-08 | Semiconductor stacking structure, and method and apparatus for separating nitride semiconductor layer using same |
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US20190189845A1 (en) | 2019-06-20 |
DE112015003254T5 (de) | 2017-04-27 |
DE112015003254T8 (de) | 2017-06-14 |
US10205052B2 (en) | 2019-02-12 |
DE112015003254B4 (de) | 2021-09-23 |
US11476388B2 (en) | 2022-10-18 |
US20210184075A1 (en) | 2021-06-17 |
JP6683382B2 (ja) | 2020-04-22 |
CN106688113B (zh) | 2020-09-22 |
KR20160008382A (ko) | 2016-01-22 |
US10916681B2 (en) | 2021-02-09 |
JP2017524268A (ja) | 2017-08-24 |
US20170271556A1 (en) | 2017-09-21 |
CN106688113A (zh) | 2017-05-17 |
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