WO2010103592A1 - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
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- WO2010103592A1 WO2010103592A1 PCT/JP2009/006343 JP2009006343W WO2010103592A1 WO 2010103592 A1 WO2010103592 A1 WO 2010103592A1 JP 2009006343 W JP2009006343 W JP 2009006343W WO 2010103592 A1 WO2010103592 A1 WO 2010103592A1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 129
- 238000004519 manufacturing process Methods 0.000 title claims description 43
- 238000000034 method Methods 0.000 title claims description 41
- 239000000758 substrate Substances 0.000 claims abstract description 126
- 229910052710 silicon Inorganic materials 0.000 claims description 67
- 239000010703 silicon Substances 0.000 claims description 67
- 238000000926 separation method Methods 0.000 claims description 37
- 239000011521 glass Substances 0.000 claims description 35
- 150000002500 ions Chemical class 0.000 claims description 9
- 238000005530 etching Methods 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 66
- 239000010408 film Substances 0.000 description 52
- 239000002243 precursor Substances 0.000 description 13
- 230000015572 biosynthetic process Effects 0.000 description 8
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- 238000005411 Van der Waals force Methods 0.000 description 5
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- 239000004973 liquid crystal related substance Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
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- 239000010409 thin film Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
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- 230000009545 invasion Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
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- 229920001187 thermosetting polymer Polymers 0.000 description 2
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- 238000005229 chemical vapour deposition Methods 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1259—Multistep manufacturing methods
- H01L27/1262—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate
- H01L27/1266—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate the substrate on which the devices are formed not being the final device substrate, e.g. using a temporary substrate
Definitions
- the present invention relates to a semiconductor device and a manufacturing method thereof, and more particularly to a semiconductor device used in a liquid crystal display device and the manufacturing method thereof.
- An active matrix liquid crystal display device includes an active matrix substrate and a counter substrate which are arranged to face each other, and a liquid crystal layer provided between the two substrates.
- This active matrix substrate has, for example, a TFT (Thin-Film-Transistor) as a switching element in each pixel in a display area for displaying an image, and a drive circuit and a control circuit in a non-display area outside the display area. Therefore, a semiconductor device is configured.
- TFT Thin-Film-Transistor
- Patent Document 1 discloses a step of forming at least a part of an element on a base layer, a step of forming a release layer, a step of forming a planarizing film, and a die by cutting the base layer at a cutting region. Forming the die, attaching the die to the substrate on the surface of the planarizing film, and separating and removing a part of the base layer along the release layer, and planarizing the die before the step of forming the die.
- a semiconductor device comprising a step of forming a groove having an opening on the surface of the film and having a bottom surface on the opposite side of the planarizing film from the release layer so that the bottom surface of the groove includes at least a part of the dividing region.
- a manufacturing method is disclosed.
- Patent Document 2 discloses a method of transferring a layer from a first wafer to a second wafer, in which the first wafer has a thickness close to or larger than the thickness of the layer to be transferred.
- a layer having a fragile region defining a layer of material selected from semiconductor materials having a thickness close to or greater than the thickness of the layer to be transferred contacts the second wafer.
- a via hole is formed in a predetermined portion of an insulating sheet made of an insulating porous material containing a thermosetting resin, and the via hole is filled with a conductive composition containing metal powder.
- FIG. 9 is a cross-sectional view showing a method for manufacturing a semiconductor device using the above-described conventional device transfer technology
- FIG. 10 is a cross-sectional view of a precursor 126 of the semiconductor device in the method for manufacturing the semiconductor device.
- a semiconductor device using the conventional device transfer technology is manufactured by performing the following steps.
- a planarizing film 123 is formed so as to cover the transistor element T.
- hydrogen ions H are implanted into the substrate on which the planarization film 123 has been formed from the planarization film 123 side, thereby forming a hydrogen implantation layer 119 at a predetermined depth in the silicon substrate 120, and the silicon die 125. Form.
- the silicon die 125 is positioned on the surface of the glass substrate 110 by aligning and arranging the silicon die 125 in a predetermined region on the surface of the glass substrate 110 that is the transfer substrate. Are joined by van der Waals force to form the precursor 126.
- the precursor 126 is annealed to separate the silicon die 125 bonded to the glass substrate 110 along the hydrogen injection layer 119.
- the bonding speed at the interface between the glass substrate 110 and the silicon die 125 depends on the strength of bonding energy (Bonding Energy) at the interface between the glass substrate 110 and the silicon die 125. If there is a distribution of energy intensity, bonding proceeds so that a relatively strong region of bonding energy surrounds a relatively weak region.
- Bonding Energy Bonding Energy
- the circuit portion C including the transistor element T is deformed as shown in FIG. To do.
- a method for solving this problem there is a method of bonding substrates (glass substrate 110 and silicon die 125) in a vacuum apparatus, or by applying high pressure and high temperature to the substrate (silicon die 125).
- a method of joining the substrates so as to drive out B to the outside can be considered, in such a method, when the size of the apparatus is increased or when high pressure and high temperature are applied to the silicon die 125, silicon is used.
- the circuit portion C formed on the die 125 may be seriously damaged.
- the present invention has been made in view of such a point, and an object of the present invention is to easily suppress the entrapment of bubbles at the bonding interface and suppress the damage of the element pattern.
- a recess is formed in at least one of a substrate to be bonded and a semiconductor element portion at a bonding interface.
- a semiconductor device is a semiconductor device including a substrate to be bonded and a semiconductor element portion bonded to the substrate to be bonded and having an element pattern formed thereon.
- a concave portion is formed in at least one of the substrate to be bonded and the semiconductor element portion at the bonding interface of the portion.
- the concave portion is formed in at least one of the bonded substrate and the semiconductor element portion at the bonded interface between the bonded substrate and the semiconductor element portion constituting the semiconductor device, the concave portion is formed at the bonded interface.
- the concave portion suppresses local deviation of bonding energy at the bonding interface.
- the semiconductor element portion is bonded to the substrate to be bonded by bonding energy having a relatively constant strength in the plane. The air bubble is easily prevented from being caught.
- the recess may be connected to the outside.
- the recess may be composed of a plurality of grooves extending in parallel with each other.
- the recesses are a plurality of grooves provided so as to extend in parallel to each other, bubbles that may be caught in the bonding interface are specifically exposed to the outside via the end portions of the grooves. Discharged.
- the concave portion may not be connected to the outside.
- the recess may be composed of a plurality of dot-like recesses that are separated from each other.
- the concave portions are a plurality of point-shaped concave portions provided so as to be separated from each other, invasion of the chemical solution, dust, or the like in the subsequent process is specifically suppressed.
- the recess may be configured to be an alignment mark for aligning the bonded substrate and the semiconductor element portion.
- the concave portion serves as an alignment mark for positioning the substrate to be bonded and the semiconductor element portion. Therefore, without adding a manufacturing process, the sandwiching of bubbles at the bonding interface can be suppressed and the substrate to be bonded can be formed. It is possible to join the semiconductor element portions with high accuracy.
- the bonded substrate may be made of glass, and the semiconductor element portion may be made of silicon.
- the bonded substrate is made of glass and the semiconductor element portion is made of silicon, for example, a TFT, a drive circuit, a control circuit, and the like are formed on a glass active matrix substrate constituting the liquid crystal display device. Specifically, the semiconductor element portions constituting the are bonded.
- the method for manufacturing a semiconductor device includes an element formation step of forming a planarization film so as to cover the element pattern after an element pattern is formed on the substrate layer, and a substrate on which the planarization film is formed.
- the bonded substrate and the semiconductor element portion at the bonding interface between the bonded substrate and the semiconductor element portion. Since the concave portion forming step for forming the concave portion in at least one of them is provided, local unevenness of bonding energy at the bonding interface is suppressed by the concave portion formed at the bonding interface. Thus, in the recess forming step, the semiconductor element portion is bonded to the substrate to be bonded by bonding energy having a relatively constant strength in the plane only by forming the recess in at least one of the substrate to be bonded and the semiconductor element portion.
- the entrapment of bubbles at the joining interface is easily suppressed. And since the entrapment of bubbles at the bonding interface is suppressed, deformation of the element pattern formed in the semiconductor element portion is suppressed, and damage to the element pattern is suppressed. Therefore, it is possible to easily suppress the entrapment of bubbles at the bonding interface and suppress damage to the element pattern.
- the formation of bubbles at the bonding interface is suppressed only by forming the recess in at least one of the substrate to be bonded and the semiconductor element portion. It is no longer necessary to prepare the environment, and the joining apparatus can be simplified and the manufacturing process can be shortened.
- separation ions may be implanted into the base layer, and the recess formation step may be performed after the separation layer formation step.
- the recessed portion forming step is performed after the separating layer forming step, for example, when the surface of the planarizing film is etched in the recessed portion forming step, the separating layer is formed on the base layer in the separating layer forming step.
- the recessed part is not formed in the surface of a base layer (planarization film
- the separation layer for separating the base layer is reliably formed at a predetermined depth of the base layer.
- the concave portion is formed in at least one of the substrate to be bonded and the semiconductor element portion at the bonding interface, it is possible to easily suppress the entrapment of bubbles at the bonding interface and suppress damage to the element pattern. Can do.
- FIG. 1 is a cross-sectional view illustrating the method for manufacturing the semiconductor device 30a according to the first embodiment.
- FIG. 2 is a perspective view of the precursor 26 for manufacturing the semiconductor device 30a.
- FIG. 3 is a cross-sectional view of the precursor 26 taken along the line III-III in FIG.
- FIG. 4 is a perspective view of a silicon die 25b used in the method for manufacturing a semiconductor device according to the second embodiment.
- FIG. 5 is a perspective view of a silicon die 25c used in the method for manufacturing a semiconductor device according to the third embodiment.
- FIG. 6 is a top view (a) and a side view (b) of the silicon die 25c.
- FIG. 7 is a cross-sectional view illustrating a semiconductor device 30b according to the fourth embodiment.
- FIG. 1 is a cross-sectional view illustrating the method for manufacturing the semiconductor device 30a according to the first embodiment.
- FIG. 2 is a perspective view of the precursor 26 for manufacturing the semiconductor device 30a.
- FIG. 8 is a cross-sectional view illustrating a semiconductor device 30c according to the fifth embodiment.
- FIG. 9 is a cross-sectional view showing a method of manufacturing a semiconductor device using a conventional device transfer technique.
- FIG. 10 is a cross-sectional view of a semiconductor device precursor 126 in a method of manufacturing a semiconductor device using a conventional device transfer technique.
- Embodiment 1 of the Invention 1 to 3 show Embodiment 1 of a semiconductor device and a manufacturing method thereof according to the present invention.
- FIG. 1 is a cross-sectional view showing a method for manufacturing the semiconductor device 30a of this embodiment.
- 2 is a perspective view of the precursor 26 of the semiconductor device 30a
- FIG. 3 is a cross-sectional view of the precursor 26 taken along line III-III in FIG.
- the semiconductor device 30 includes a glass substrate 10a provided as a substrate to be bonded, and a semiconductor element portion 25aa bonded to the glass substrate 10a by using van der Waals force. Yes.
- the semiconductor element portion 25aa includes a planarizing film 23 having a plurality of grooves 23a formed on the bottom surface so as to extend in parallel with each other, and a gate electrode provided on the planarizing film 23. 22, a gate insulating film 21 provided on the planarizing film 23 so as to cover the gate electrode 22, and a source region R and a drain region D so as to be separated from each other with the gate electrode 22 interposed therebetween on the gate insulating film 21. And a provided silicon substrate layer 20a.
- the gate electrode 22 and the source region R and the drain region D provided on the gate electrode 22 via the gate insulating film 21 constitute a transistor element T (element pattern) as shown in FIG. is doing.
- the ratio of the total area occupied by each groove 23a to the area of the bonding surface of the semiconductor element portion 25aa is up to about 70% (preferably up to 50%).
- the width, depth, and pitch are set so that Here, this ratio is considered to depend on factors such as the type of pattern shape (such as a lattice shape or stripe shape) of the plurality of grooves 23a formed in the planarizing film 23, the planarity and material of the planarizing film, and the like. Therefore, the width, depth, and pitch required for each groove 23a of the planarizing film 23 depend on these factors.
- the manufacturing method of the semiconductor device 30a includes an element forming step, a separation layer forming step, a recess forming step, a base layer arranging step, and a base layer separating step.
- the gate insulating film 21 is formed by processing the silicon substrate 20 as a base layer in a high temperature atmosphere and growing a silicon oxide film on the surface thereof.
- the polysilicon film is patterned by photolithography to form a gate.
- the electrode 22 is formed.
- phosphorus ions are implanted into the silicon substrate 20 using the gate electrode 22 and the like as a mask, thereby forming a source region S and a drain region D on the surface of the silicon substrate 20 to form a transistor element T.
- a silicon oxide film for example, is formed on the entire substrate on which the transistor element T is formed by plasma CVD, and then the silicon oxide film is planarized by CMP (Chemical-Mechanical-Polishing) method.
- CMP Chemical-Mechanical-Polishing
- ⁇ Separation layer forming step> By implanting separation ions H such as hydrogen and helium into the silicon substrate 20 on which the transistor element T and the planarizing film 23 are formed in the element formation step, as shown in FIG. A separation layer 19 is formed at a predetermined depth inside the substrate 20.
- ⁇ Recess formation process> After forming a resist pattern (not shown) on the surface of the planarization film 23 of the silicon substrate 20 on which the isolation layer 19 is formed in the isolation layer forming step, the planarization film 23 exposed from the resist pattern is dry-etched or By wet etching, as shown in FIG. 1B, a plurality of grooves 23a are formed as recesses, and a silicon die 25a is formed.
- FIG. 1 (c) ⁇ Base layer arrangement process>
- the silicon die 25a formed in the recess forming step is formed on the surface of the glass substrate 10 as shown in FIG. 1 (c), FIG. 2 and FIG. Are joined by van der Waals force to form the precursor 26.
- the entrapment of bubbles is suppressed by the grooves 23a formed in the planarizing film 23 as shown in FIG. 2 is a perspective view of the precursor 26 shown in FIG. 1C viewed from the glass substrate 10a side so that the grooves 23a formed in the planarizing film 23 can be easily confirmed.
- ⁇ Base layer separation process> The precursor 26 formed in the base layer arrangement step is annealed at a temperature of about 500 ° C., whereby the silicon substrate 20 is cleaved along the separation layer 19 into the silicon substrate layer 20a and the discarded substrate layer 20b. Separately, a semiconductor element portion 25aa is formed.
- the semiconductor device 30a of this embodiment can be manufactured.
- the semiconductor element portion 25aa (silicon die 25a) is formed on the glass substrate 10a only by forming a plurality of grooves 23a on the surface of the planarizing film 23 of the silicon die 25a to be the semiconductor element portion 25aa. Since bonding is performed by bonding energy having a relatively constant strength in the plane, it is possible to easily suppress the entrapment of bubbles at the bonding interface. In addition, since it is possible to suppress the entrapment of bubbles at the bonding interface, it is possible to suppress the deformation of the circuit portion C including the transistor element T and the like formed in the semiconductor element portion 25aa, and to suppress damage to the transistor element T. be able to.
- the recess forming step it is possible to suppress the entrapment of bubbles at the bonding interface only by forming the plurality of grooves 23a in the silicon die 25a to be the semiconductor element portion 25aa. It is not necessary to prepare a device for holding 10a and the silicon die 25a in a vacuum atmosphere, or a device for applying high pressure and high temperature to the silicon die 25a, thereby simplifying the joining device and shortening the manufacturing process. Can do.
- the silicon substrate is formed when the separating layer 19 is formed on the silicon substrate 20 in the separating layer forming step. No recess is formed on the surface of 20 (flattening film 23). Therefore, when the separation ions H are implanted into the silicon substrate 20 in the separation layer forming step, the implantation surface is flat, so that the implantation depth of the separation ions H in the silicon substrate 20 is constant, and the base body In the layer separation step, when the semiconductor element portion 25aa is formed, the separation layer 19 for separating the silicon substrate 20 can be reliably formed at a predetermined depth inside the silicon substrate 20.
- the recesses of the planarization film 23 are the plurality of grooves 23a provided so as to be connected to the outside and extend in parallel with each other, and thus each groove 23a. Air bubbles that may be caught in the bonding interface can be discharged to the outside through the end portion of the. Furthermore, even when hydrogen gas or the like is diffused not only during the above-described bonding process but also in the subsequent annealing process or cleaving process, it is possible to suppress the generation of bubbles at the bonding interface.
- the method of manufacturing the semiconductor device 30a in which one transistor element T is formed on the silicon substrate 20 to form the silicon die 25a has been exemplified.
- the present invention provides an element such as a transistor element on the silicon substrate.
- the method can be applied to a method of simultaneously forming a plurality of silicon dies by forming a large number of patterns and then dividing the silicon substrate into each element pattern.
- FIG. 4 is a perspective view of a silicon die 25b used in the method for manufacturing a semiconductor device of this embodiment.
- the same portions as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.
- a plurality of grooves 23a are formed on the surface of the planarizing film 23.
- FIG. As shown, not only a plurality of grooves 23b but also alignment marks 23c are formed on the surface of the planarizing film 23.
- channel 23a of the said Embodiment 1 was substantially U shape
- channel 23b of this embodiment is substantially V shape.
- the silicon die 25b changes the shape of the resist pattern used when etching the planarizing film 23 in the recess forming step of the manufacturing method of the first embodiment, and simultaneously forms the grooves 23b and the alignment marks 23c.
- the alignment mark 23c is exemplified as a rectangular shape, but may be a circular shape or other polygonal shapes.
- each groove 23b is formed in the planarization film 23 constituting the semiconductor element portion, as in the first embodiment. It is possible to easily suppress the entrapment of bubbles at the interface and suppress damage to the transistor element, and the alignment mark 23c is formed at the connection interface, so that the semiconductor element can be formed on the glass substrate without adding a manufacturing process.
- the silicon die 25b to be a part can be bonded with high accuracy.
- FIG. 5 is a perspective view of a silicon die 25c used in the method for manufacturing a semiconductor device of this embodiment
- FIG. 6 is a top view (a) and a side view (b) of the silicon die 25c.
- the recesses are connected to the outside.
- the recesses are not connected to the outside.
- the planarizing film 23 is provided with a plurality of point-like recesses 23d so as to be separated from each other.
- the silicon die 25c is prepared by changing the shape of the resist pattern used when etching the planarizing film 23 and forming each dot-like recess 23d in the recess forming step of the manufacturing method of the first embodiment. be able to.
- each point-like recess 23d is formed in the planarizing film 23 constituting the semiconductor element portion, as in the first and second embodiments. Therefore, it is possible to easily suppress the entrapment of bubbles at the bonding interface and suppress the damage to the transistor element, and the recesses of the planarization film 23 are provided so as to be separated from each other not connected to the outside. Since it is the point-like recessed part 23d, the penetration
- FIG. 7 is a cross-sectional view showing the semiconductor device 30b of this embodiment.
- the recesses for suppressing the deformation of the transistor elements are formed only on the surface of the planarizing film 23 that constitutes the silicon dies 25a, 25b, and 25c serving as the semiconductor element portions.
- the concave portion is formed not only on the surface of the semiconductor element portion 25aa but also on the surface of the glass substrate 10b.
- the semiconductor device 30b includes a glass substrate 10b provided as a substrate to be bonded, and a semiconductor element portion 25aa bonded to the glass substrate 10b using van der Waals force. Yes.
- a plurality of grooves 10c are provided at the connection interface so as to extend in parallel with each other.
- the glass substrate 10b is not only etched in the flattening film 23 in the recess forming step of the manufacturing method of the first embodiment, but a resist pattern is formed in a region that becomes a bonding interface of the glass substrate 10b, and is exposed from the resist pattern.
- Each groove 10c can be formed and prepared by dry etching or wet etching of the upper portion of the substrate to be processed.
- each groove 23a is formed in the planarizing film 23 constituting the semiconductor element portion 25aa, and each groove 10c is formed in the glass substrate 10b. It is possible to easily suppress the entrapment of bubbles at the interface and suppress damage to the transistor element.
- FIG. 8 is a cross-sectional view showing the semiconductor device 30c of this embodiment.
- the recess for suppressing the deformation of the transistor element is formed at least on the surface of the planarization film 23 constituting the semiconductor element portion.
- the concave portion is formed only on the surface of the glass substrate 10b.
- the semiconductor device 30c includes a glass substrate 10b provided as a substrate to be bonded, and a semiconductor element unit 25 bonded to the glass substrate 10b by using van der Waals force. Yes.
- the semiconductor element portion 25 has substantially the same configuration as the semiconductor element portion 25aa described in the first embodiment except that no recess is formed on the surface of the planarizing film 23. Yes.
- each groove 10c is formed in the glass substrate 10b, it is possible to easily suppress the entrapment of bubbles at the bonding interface and to suppress damage to the transistor element.
- the method of implanting separation ions into the base layer and forming the separation layer inside the base layer has been exemplified.
- relative structures such as a porous layer, an amorphous layer, and a columnar structure are formed inside the base layer. It is also possible to form a separation layer by forming a weak layer structure.
- the glass substrate is exemplified as the bonded substrate, but a plastic substrate or a metal plate may be used as the bonded substrate.
- the thin film silicon device may be formed in advance on the bonded substrate, or the thin film silicon device may be formed on the bonded substrate after the semiconductor element portion is bonded to the bonded substrate.
- the circuit portion made up of transistor elements or the like is exemplified as the element pattern to be transferred, but only a thin film pattern constituting a part of the circuit portion may be used as the element pattern.
- the present invention can be easily applied to a liquid crystal display device manufactured using a device transfer technique because it can easily suppress the pinching of bubbles at the bonding interface and suppress damage to the element pattern. It is.
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Abstract
Description
図1~図3は、本発明に係る半導体装置及びその製造方法の実施形態1を示している。具体的に、図1は、本実施形態の半導体装置30aの製造方法を示す断面図である。また、図2は、半導体装置30aの前駆体26の斜視図であり、図3は、図2中のIII-III線に沿った前駆体26の断面図である。
まず、基体層であるシリコン基板20を高温雰囲気下で処理して、その表面にシリコン酸化膜を成長させることにより、ゲート絶縁膜21を形成する。
上記素子形成工程でトランジスタ素子T及び平坦化膜23が形成されたシリコン基板20に対して、図1(a)に示すように、水素、ヘリウムなどの分離用イオンHを注入することにより、シリコン基板20の内部の所定の深さに分離層19を形成する。
上記分離層形成工程で分離層19が形成されたシリコン基板20の平坦化膜23の表面に、レジストパターン(不図示)を形成した後に、そのレジストパターンから露出する平坦化膜23をドライエッチング又はウエットエッチングすることにより、図1(b)に示すように、凹部として複数の溝条23aを形成して、シリコンダイ25aを形成する。
上記凹部形成工程で形成されたシリコンダイ25aをガラス基板10a上の所定位置に配置させることにより、図1(c)、図2及び図3に示すように、ガラス基板10の表面にシリコンダイ25aをファンデルワールス力により接合して、前駆体26を形成する。ここで、前駆体26におけるガラス基板10a及びシリコンダイ25aの接合界面では、図3に示すように、平坦化膜23に形成された各溝条23aにより、気泡の挟み込みが抑制されている。なお、図2は、平坦化膜23に形成された各溝条23aを確認し易いように、図1(c)の前駆体26をガラス基板10a側からみた斜視図になっている。
上記基体層配置工程で形成された前駆体26に対して、500℃程度の温度でアニール処理を行うことにより、シリコン基板20を分離層19に沿ってシリコン基板層20a及び捨て基板層20bに劈開分離して、半導体素子部25aaを形成する。
図4は、本実施形態の半導体装置の製造方法に用いるシリコンダイ25bの斜視図である。なお、以下の各実施形態において、図1~図3と同じ部分については同じ符号を付して、その詳細な説明を省略する。
図5は、本実施形態の半導体装置の製造方法に用いるシリコンダイ25cの斜視図であり、図6は、シリコンダイ25cの上面図(a)及び側面図(b)である。
図7は、本実施形態の半導体装置30bを示す断面図である。
図8は、本実施形態の半導体装置30cを示す断面図である。
C 回路部(素子パターン)
T トランジスタ素子(素子パターン)
10a,10b ガラス基板(被接合基板)
10c,23a,23b 溝条(凹部)
19 分離層
20 シリコン基板(基体層)
23 平坦化膜
23c アライメントマーク(凹部)
23d 点状凹部
25,25aa 半導体素子部
30a~30c 半導体装置
Claims (9)
- 被接合基板と、
上記被接合基板に接合され、素子パターンが形成された半導体素子部とを備えた半導体装置であって、
上記被接合基板及び半導体素子部の接合界面において、上記被接合基板及び半導体素子部の少なくとも一方には、凹部が形成されていることを特徴とする半導体装置。 - 請求項1に記載された半導体装置において、
上記凹部は、外部につながっていることを特徴とする半導体装置。 - 請求項2に記載された半導体装置において、
上記凹部は、互いに平行に延びる複数の溝条により構成されていることを特徴とする半導体装置。 - 請求項1に記載された半導体装置において、
上記凹部は、外部につながっていないことを特徴とする半導体装置。 - 請求項4に記載された半導体装置において、
上記凹部は、互いに離間する複数の点状凹部により構成されていることを特徴とする半導体装置。 - 請求項1乃至5の何れか1つに記載された半導体装置において、
上記凹部は、上記被接合基板及び半導体素子部を位置合わせするためのアライメントマークとなるように構成されていることを特徴とする半導体装置。 - 請求項1乃至6の何れか1つに記載された半導体装置において、
上記被接合基板は、ガラス製であり、
上記半導体素子部は、シリコン製であることを特徴とする半導体装置。 - 基体層に素子パターンを形成した後に、該素子パターンを覆うように平坦化膜を形成する素子形成工程と、
上記平坦化膜が形成された基体層に分離層を形成する分離層形成工程と、
被接合基板の所定位置に上記素子パターン及び分離層が形成された基体層を配置する基体層配置工程と、
上記被接合基板に配置された基体層における該被接合基板と反対側を上記分離層に沿って分離して、半導体素子部を形成する基体層分離工程とを備える半導体装置の製造方法であって、
上記平坦化膜及び上記被接合基板の少なくとも一方の表面をエッチングして、該表面に凹部を形成する凹部形成工程を備えることを特徴とする半導体装置の製造方法。 - 請求項8に記載された半導体装置の製造方法において、
上記分離層形成工程では、上記基体層に分離用イオンを注入し、
上記分離層形成工程の後に上記凹部形成工程を行うことを特徴とする半導体装置の製造方法。
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JPH0737768A (ja) * | 1992-11-26 | 1995-02-07 | Sumitomo Electric Ind Ltd | 半導体ウェハの補強方法及び補強された半導体ウェハ |
JPH0963912A (ja) * | 1995-08-18 | 1997-03-07 | Hoya Corp | 貼り合わせ基板製造方法 |
JPH1145862A (ja) * | 1997-07-24 | 1999-02-16 | Denso Corp | 半導体基板の製造方法 |
JP2001313381A (ja) * | 2000-04-28 | 2001-11-09 | Matsushita Electric Ind Co Ltd | 半導体ウェーハ並びにそれを用いた半導体デバイス及びその製造方法 |
WO2006103825A1 (ja) * | 2005-03-25 | 2006-10-05 | Sharp Kabushiki Kaisha | 半導体装置及びその製造方法 |
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- 2009-11-25 CN CN2009801526045A patent/CN102265380A/zh active Pending
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JPH0737768A (ja) * | 1992-11-26 | 1995-02-07 | Sumitomo Electric Ind Ltd | 半導体ウェハの補強方法及び補強された半導体ウェハ |
JPH0963912A (ja) * | 1995-08-18 | 1997-03-07 | Hoya Corp | 貼り合わせ基板製造方法 |
JPH1145862A (ja) * | 1997-07-24 | 1999-02-16 | Denso Corp | 半導体基板の製造方法 |
JP2001313381A (ja) * | 2000-04-28 | 2001-11-09 | Matsushita Electric Ind Co Ltd | 半導体ウェーハ並びにそれを用いた半導体デバイス及びその製造方法 |
WO2006103825A1 (ja) * | 2005-03-25 | 2006-10-05 | Sharp Kabushiki Kaisha | 半導体装置及びその製造方法 |
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WO2012046428A1 (ja) * | 2010-10-08 | 2012-04-12 | シャープ株式会社 | 半導体装置の製造方法 |
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