WO1998009333A1 - Separating method, method for transferring thin film device, thin film device, thin film integrated circuit device, and liquid crystal display device manufactured by using the transferring method - Google Patents
Separating method, method for transferring thin film device, thin film device, thin film integrated circuit device, and liquid crystal display device manufactured by using the transferring method Download PDFInfo
- Publication number
- WO1998009333A1 WO1998009333A1 PCT/JP1997/002972 JP9702972W WO9809333A1 WO 1998009333 A1 WO1998009333 A1 WO 1998009333A1 JP 9702972 W JP9702972 W JP 9702972W WO 9809333 A1 WO9809333 A1 WO 9809333A1
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- WO
- WIPO (PCT)
- Prior art keywords
- layer
- substrate
- thin film
- separation layer
- separation
- Prior art date
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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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13454—Drivers integrated on the active matrix substrate
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/13613—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit the semiconductor element being formed on a first substrate and thereafter transferred to the final cell substrate
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- H—ELECTRICITY
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/7624—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology
- H01L21/76251—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/7624—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology
- H01L21/76251—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques
- H01L21/76254—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques with separation/delamination along an ion implanted layer, e.g. Smart-cut, Unibond
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/7624—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology
- H01L21/76251—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques
- H01L21/76259—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques with separation/delamination along a porous layer
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68359—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used as a support during manufacture of interconnect decals or build up layers
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68363—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used in a transfer process involving transfer directly from an origin substrate to a target substrate without use of an intermediate handle substrate
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78603—Thin film transistors, i.e. transistors with a channel being at least partly a thin film characterised by the insulating substrate or support
Definitions
- the present invention relates to a method of peeling an object to be peeled, and more particularly to a method of peeling a transfer layer formed of a thin film such as a functional thin film and transferring it to a transfer body such as a transparent substrate.
- the present invention relates to a method for transferring a thin film device, and a thin film device, a thin film integrated circuit device, and a liquid crystal display device manufactured using the method.
- a process of forming a thin film transistor on a transparent substrate by a CVD method or the like is performed.
- These thin film transistors include those using amorphous silicon (a-S i) and those using polysilicon (p-S i). Films are formed by applying a low temperature process and films formed through a low temperature process.
- the substrate on which the thin film devices are mounted must satisfy the conditions for manufacturing the thin film devices. But with thin-film devices When focusing only on the stage after the mounted substrate is completed, the above “substrate” may not always be preferred.
- quartz glass and heat-resistant glass are used in manufacturing processes involving high-temperature treatment, but they are rare and extremely expensive materials compared to ordinary glass, and large-sized transparent substrates must be manufactured. Is difficult.
- both quartz glass and heat-resistant glass are brittle and easily broken, and they are heavy. This is a serious disadvantage in mounting a substrate on which a thin film device such as TFT is formed in an electronic device or the like. In other words, there is a gap between the constraints caused by the manufacturing conditions and the desirable characteristics required for the product, and it has been extremely difficult to satisfy both conditions and characteristics.
- the present invention has been made in view of such a problem, and one of its objects is to enable easy peeling irrespective of the characteristics, conditions, and the like of an object to be peeled.
- An object of the present invention is to provide a peeling method capable of transferring to a substrate.
- a new substrate that enables the independent selection of a substrate used in the manufacture of a thin-film device and a substrate used in the actual use of a product (a substrate having favorable properties from the viewpoint of the product's use), for example.
- Another object of the present invention is to provide a novel technology that reduces the light energy applied to the separation layer that causes peeling in the transfer process and does not degrade the characteristics of the thin film device transferred to the substrate.
- the peeling method of the present invention is a peeling method of peeling an object to be peeled present on a substrate via a separation layer from the substrate, and irradiating the separation layer with irradiation light. In the layer and / or at the interface, and the object to be separated is separated from the substrate.
- the separation layer is irradiated with irradiation light from the substrate side to cause separation in the separation layer and / or at the interface. And transfer to the transfer member.
- a step of forming a separation layer on a light-transmitting substrate a step of forming a transfer-receiving layer directly or via a predetermined intermediate layer on the separation layer; and Bonding the transfer body to the opposite side, irradiating the separation layer with irradiation light from the substrate side to cause peeling in the layer of the separation layer and / or at the interface, and to transfer the transferred layer from the substrate. Separating and transferring to the transfer body.
- a step of removing the separation layer attached to the substrate side and / or the transfer body side may be included.
- the transfer body is a transparent substrate.
- the transfer body may be made of a material having a glass transition point (T g) or a softening point of T max or less, where T max is the maximum temperature at the time of forming the layer to be transferred.
- T g glass transition point
- T max is the maximum temperature at the time of forming the layer to be transferred.
- the transfer body is preferably made of a material having a glass transition point (T g) or softening point of 800 ° C. or less.
- the transfer body is made of a synthetic resin or a glass material. No.
- the substrate has heat resistance.
- the substrate be made of a material having a strain point equal to or higher than Tmax, where Tmax is the maximum temperature at the time of forming the transferred layer.
- the peeling of the separation layer is caused by disappearance or decrease of the bonding force between atoms or molecules of a substance constituting the separation layer.
- the irradiation light is preferably a laser light.
- the wavelength of the laser light is preferably 100 to 35 Onm. Further, it is preferable that the wavelength of the laser beam is 350 to 120 Onm.
- the separation layer is preferably made of amorphous silicon.
- the amorphous silicon preferably contains H (hydrogen) at 2 at% or more.
- the separation layer may be made of ceramics.
- the separation layer may be made of a metal.
- the separation layer may be made of an organic polymer material.
- the invention is characterized in that the separation layer in the invention disclosed in the above item 1 is constituted by a laminate of a plurality of layers. Further, the separation layer includes at least two layers having different compositions or characteristics.
- the separation layer preferably includes a light absorption layer that absorbs the irradiation light, and another layer having a different composition or characteristics from the light absorption layer.
- the separation layer includes a light absorption layer that absorbs the irradiation light and a light blocking layer that blocks the irradiation light.
- the light-shielding layer is located on the opposite side of the light-absorbing layer from the incident direction of the irradiation light.
- the light-shielding layer is a reflection layer that reflects the irradiation light.
- the reflection layer is made of a metal thin film.
- a method of transferring a thin film device on a substrate to a transfer body wherein: a step of forming a separation layer on the substrate; a step of forming a transfer target layer including a thin film deposition on the separation layer; Bonding the transfer-receiving layer to the transfer body via an adhesive layer, irradiating the separation layer with light, and causing separation in the layer and / or interface of the separation layer; and Separating from the separation layer.
- a separation layer having a property of absorbing light is provided on a substrate having high reliability in device manufacture, and a thin film device such as TFT is formed on the substrate.
- a thin film device is bonded to a desired transfer body via an adhesive layer, and thereafter, the separation layer is irradiated with light, thereby causing a separation phenomenon in the separation layer.
- the adhesion between the separation layer and the substrate is reduced.
- a force is applied to the substrate to detach the substrate from the thin film device.
- a desired and highly reliable device can be transferred (formed) to any transfer member.
- the step of bonding the thin film device (the layer to be transferred including the thin film device) to the transfer body via the adhesive layer and the step of separating the substrate from the thin film device may be performed in any order. But it doesn't matter. However, if there is a problem with the handling of the thin film device (transferred layer including the thin film device) after the substrate is separated, it is necessary to first bond the thin film device to the transfer body and then release the substrate. desirable.
- the substrate is a light-transmitting substrate, and the irradiation of the separation layer with the light is performed through the light-transmitting substrate.
- a transparent substrate such as a quartz substrate
- a highly reliable thin film device can be manufactured, and light can be collectively radiated from the back surface of the substrate to the entire surface of the separation layer, thereby improving transfer efficiency.
- a method for transferring a transfer-receiving layer including a thin-film device on a substrate to a transfer body comprising: a first step of forming an amorphous silicon layer on the substrate; and including the thin-film deposition on the amorphous silicon layer.
- a second step of forming the transferred layer a third step of joining the transferred layer including the thin-film device to the transfer body via an adhesive layer, and applying light to the amorphous silicon layer through the substrate.
- the film thickness of the emission layer characterized in that it is formed rather carrying than the thickness of the book film transients scan evening channel layer formed in the second step.
- an amorphous silicon layer is used as a layer formed on the substrate in the first step and peeling off by light irradiation in the fourth step.
- the amorphous silicon layer is required to be irradiated with light to cause peeling (referred to as abrasion in FIG. 39). Light energy can be reduced.
- the transferred layer formed in the second step contains a thin film transistor as a thin film device, and its channel layer is made of polysilicon or amorphous silicon. It is formed of a silicon layer such as a capacitor, and generally has a thickness of more than 25 nm, for example, about 50 nm.
- the thickness of the amorphous silicon as the separation layer (ablation layer) formed in the first step is formed to be thinner than the channel layer of the thin film transistor in the transferred layer. Therefore, energy consumption in the light irradiation step is reduced, and the size of the light source device used therefor can be reduced. Furthermore, since the light energy irradiated is small, even if light leaks from the amorphous silicon layer and the leaked light is incident on the thin film device, the characteristics of the thin film device are reduced by the small light energy. Degradation is reduced.
- the thickness of the layer is defined as 25 nm or less. As described above, as shown in FIG. 39, as the thickness of the amorphous silicon layer becomes thinner, the light energy required to irradiate the amorphous silicon layer with light and cause peeling can be reduced. If it is thick, the light energy can be made sufficiently small. Note that the thickness range of the amorphous silicon layer is preferably 5 to 25 nm, and more preferably 15 nm or less, or 1 I nm or less, the amorphous silicon layer is irradiated with light to cause peeling. The light energy required for light can be further reduced.
- the amorphous silicon layer is formed by low-pressure vapor deposition (LPCVD).
- LPCVD low-pressure vapor deposition
- an amorphous silicon layer is formed by LPC VD, compared to plasma CVD, atmospheric pressure (AP) CVD, ECR, etc., the adhesion is high, and when forming a transfer layer including the thin film device, There is little danger that hydrogen will be generated and defects such as film peeling will occur.
- a method of transferring a transfer-receiving layer including a thin-film device on a substrate to a transfer body comprising: forming a separation layer on the substrate; and forming a silicon-based light absorption layer on the separation layer. Forming the transfer layer including the thin film device on the silicon-based light absorbing layer; and bonding the transfer layer including the thin film device to the transfer body via an adhesive layer Irradiating the separation layer with light through the substrate to cause separation in and / or at the interface of the separation layer; and detaching the substrate from the separation layer. It is characterized by. According to the present invention, even if light leaks from the separation layer, the leaked light is absorbed by the silicon-based light absorbing layer before being incident on the recording film device.
- the transferred layer including the thin film device can be formed on the silicon-based light absorbing layer. Therefore, unlike the case where the transfer-receiving layer is formed on a metal layer having a light reflecting effect, there is no risk of metal contamination, and the thin film forming technology on silicon, which has been established conventionally, is utilized. However, the film device can be formed.
- the separation layer and the light absorption layer are formed of amorphous silicon, and a step of forming a silicon-based intervening layer between the separation layer and the light absorption layer is further provided.
- a silicon-based intervening layer between the separation layer and the light absorption layer is further provided.
- an amorphous silicon layer that absorbs the irradiated light and peels off when its light energy exceeds a predetermined value is used as the separation layer and the silicon-based light absorption layer.
- a silicon-based material for example, silicon oxide, is used as an intervening layer for separating the two amorphous silicon layers.
- a method for transferring a transfer-receiving layer including a thin-film device on a substrate to a transfer body comprising: a first step of forming a separation layer on the substrate; and A second step of forming a transferred layer, a third step of joining the transferred layer including the thin film device to the transfer body via an adhesive layer, and irradiating the separation layer with light through the substrate.
- the fourth step includes: The stress acting on the upper layer of the separation layer when peeling occurs in the layer and / or at the interface is received by the resistance of the upper layer of the separation layer to prevent deformation or destruction of the upper layer of the separation layer. It is characterized by doing.
- the material constituting the separation layer When light is irradiated in this fourth step, the material constituting the separation layer is excited optically or thermally, breaking the bonds of molecules or atoms on its surface or inside, and the molecules or atoms become external. Will be released.
- This phenomenon mainly appears as a phenomenon in which all or a part of the material constituting the separation layer undergoes a phase change such as melting and evaporation (vaporization).
- a stress acts on the upper layer of the separation layer as the molecules or atoms are released. Only The stress is received by the resistance of the upper layer of the separation layer to the deformation, and the upper layer of the separation layer is prevented from being deformed or broken.
- the material and / or thickness of the constituent layers constituting the upper layer of the separation layer may be designed in consideration of such resistance.
- one or more of the thickness of the adhesive layer, the thickness of the layer to be transferred, the material and the thickness of the transfer body are set in consideration of the above-mentioned resistance to power.
- a step of forming a reinforcing layer for ensuring the power resistance at any position that is to be an upper layer of the separation layer is further included.
- the reinforcing layer is added, Deformation and destruction of the device can be prevented.
- a beam such as a spot beam or a line beam that is locally applied to the separation layer is intermittently moved and scanned in order to irradiate light to almost the entire surface of the separation layer.
- This beam scanning can be realized by relatively moving the substrate on which the separation layer is formed and the beam light source itself or its optical system. Light irradiation may be continued during the relative movement, or Light irradiation may be stopped occasionally. According to the present invention, adjacent beam irradiation areas are prevented from overlapping each other during the intermittent beam scanning.
- the beam irradiation areas overlap each other, there is a risk that excessive light more than enough light to cause separation in the separation layer and / or at the interface may be irradiated. is there.
- the analysis by the present inventors has revealed that a part of the excessive light leaks and enters the thin film device via the separation layer, thereby deteriorating the characteristics of the thin film device, for example, the electrical characteristics.
- the original characteristics of the thin film device can be maintained even after the thin film device is transferred to the transfer body.
- the separation does not occur in the separation layer in the low irradiation area or the non-irradiation area, but the adhesion in the separation layer and the substrate can be sufficiently reduced by the separation in the beam irradiation areas on both sides thereof.
- the beam scanning each time is defined from a viewpoint different from the above-mentioned invention (4).
- the fourth step sequentially scans a beam locally applied to the separation layer, wherein the beam has a flat beak region where the light intensity is maximum in a central region thereof,
- the N-th (N is an integer of 1 or more) beam irradiation region and another beam irradiation region are characterized in that the beam scanning is performed so that the flat beak regions of each beam do not overlap with each other.
- the fourth step sequentially scans a beam locally irradiated on the separation layer, and the beam has a maximum light intensity in a central region thereof, and N (N is The beam irradiation area and the other beam irradiation areas are scanned so that the effective beam irradiation areas that are 90% or more of the maximum light intensity of each beam do not overlap each other. It is characterized by the following.
- beam scanning is performed so that the flat peak areas of each beam or the beam irradiation effective areas that are 90% or more of the maximum light intensity of each beam do not overlap with each other.
- this includes the case where the same region of the separation layer is continuously irradiated with the beam twice.
- the total beam irradiation amount (sum of light intensity X time) in the same region is a hula, sotopeak region, or an effective beam irradiation region where the maximum light intensity is 90% or more. Is less than when the same area is set twice consecutively.
- the separation layer in the area may be separated for the first time by the two beam irradiations, and in this case, the above-described excessive beam irradiation does not occur.
- the separation layer is peeled off by the first beam irradiation, light incident on the thin film device due to the second beam irradiation can be reduced, and the electrical characteristics of the thin film device can be prevented from deteriorating. Or can be reduced.
- the thin film device formed on any substrate by using the thin film device transfer technology (transfer technology of the thin film structure) of the present invention is improved by improving the light irradiation process for peeling the separation layer. Deterioration of the characteristics of the thin film device can be prevented or reduced. If the thin film device is a thin film transistor (TFT), the light applied to the channel layer of the TFT gives damage due to the improvement of the light irradiation process for peeling off the separation layer, thereby reducing the on-current. In the worst case, the TFT can be prevented from being destroyed by causing an increase in off-state current.
- TFT thin film transistor
- the method further includes a step of removing the separation layer attached to the transfer body. This completely removes unnecessary separation layers.
- the transfer member is a transparent substrate.
- an inexpensive substrate such as a soda glass substrate or a transparent plastic film having flexibility can be used as a transfer body.
- the transfer body is characterized in that, when the maximum temperature at the time of forming the layer to be transferred is T max, the transfer body is made of a material whose glass transition point (T g) or softening point is equal to or lower than the T max.
- Inexpensive glass substrates which could not withstand the maximum temperature during device manufacturing and could not be used in the past, can now be used freely.
- the transfer body is characterized in that the glass transition point (T g) or softening point is lower than or equal to the maximum temperature of the forming process of the thin film device. It defines the upper limit of the glass transition point (T g) or softening point.
- the transfer member is made of a synthetic resin or a glass material. For example, flexibility of plastic film By transferring a thin film device to a (flexible) synthetic resin plate, it is possible to realize excellent characteristics that cannot be obtained with a highly rigid glass substrate. When the present invention is applied to a liquid crystal display device, a display device that is flexible, light, and resistant to falling is realized. Further, by transferring the TFT onto the synthetic resin substrate by using the above-described transfer method, it is also possible to configure a book film integrated circuit such as a single-chip micro-combiner configured using the TFT.
- an inexpensive substrate such as a soda glass substrate can be used as the transfer body.
- Soda glass substrates are inexpensive and economically advantageous.
- the soda glass substrate has a problem that the thermal component elutes due to the heat treatment during TFT manufacturing, and it has been difficult to apply it to an active matrix type liquid crystal display device in the past.
- a substrate having a conventional problem such as a soda glass substrate can be used.
- the substrate is characterized by having heat resistance. As a result, a desired high-temperature treatment can be performed at the time of manufacturing a thin film device, and a highly reliable and high performance thin film device can be manufactured.
- the substrate is characterized in that the substrate transmits 10% or more of light of 31 O nm.
- a light-transmitting substrate capable of supplying light energy for causing abrasion in the separation layer is used.
- the substrate is formed of a material having a strain point equal to or higher than the Tmax when the maximum temperature at the time of forming the transfer layer is Tmax.
- a desired high-temperature treatment can be performed at the time of manufacturing a thin film device, and a highly reliable and high performance thin film device can be manufactured.
- the isolation layer is made of amorphous silicon.
- Amorphous silicon absorbs light, is easy to manufacture, and is highly practical.
- the amorphous silicon contains hydrogen (H) in an amount of 2 atomic% or more. When amorphous silicon containing hydrogen is used, hydrogen is released by light irradiation, and an internal pressure is generated in the separation layer, which promotes separation in the separation layer. There is a business.
- the amorphous silicon contains hydrogen (H) at 10 atomic% or more. As the hydrogen content increases, the effect of promoting separation in the separation layer becomes more prominent.
- the isolation layer is made of silicon nitride.
- silicon nitride is used as the separation layer, nitrogen is released in response to light irradiation, thereby promoting separation in the separation layer.
- the separation layer is made of a hydrogen-containing alloy. Accordingly, when a hydrogen-containing alloy is used as the separation layer, hydrogen is released with light irradiation, thereby promoting separation in the separation layer.
- the separation layer is made of a nitrogen-containing metal alloy.
- nitrogen-containing alloy is used for the separation layer, nitrogen is released with light irradiation, and thereby separation in the separation layer is promoted.
- the separation layer is formed of a multilayer film. This clearly shows that the invention is not limited to a single-layer film.
- This multilayer film is characterized by comprising an amorphous silicon film and a metal film formed thereon.
- the separation layer is made of at least one of ceramics, metal, and organic polymer material.
- the metal for example, a hydrogen-containing alloy or a nitrogen-containing alloy can be used. In this case, as in the case of amorphous silicon, release of hydrogen gas or nitrogen gas accompanying light irradiation promotes separation in the separation layer.
- the light is a laser light.
- the laser light is coherent light and is suitable for causing separation in the separation layer.
- the wavelength of one laser beam is 100 ⁇ ! 3350 nm.
- the separation layer can be effectively separated by using one laser beam having a short wavelength and light energy.
- An excimer laser for example, satisfies the above conditions.
- Excimer one The scratch, high Engineering Nerugi of short wavelength ultraviolet range - a gas laser capable laser first light output of a rare gas as the laser medium (A r, K r, X e) and halogen gas (F 2, HC 1)
- Irradiation with excimer laser light can produce effects such as direct breaking of molecular bonds without heat influence and gas evaporation in the separation layer provided on the substrate.
- the laser beam has a wavelength of 350 nm to 120 Onm.
- a laser beam having a wavelength of about 35 nm to 200 nm can be used.
- the thin film device is a thin film transistor (TFT). Further, the present invention is characterized in that the TFT is a CMOS type TFT.
- a high-performance TFT can be freely transferred (formed) onto a desired transfer body. Therefore, various electronic circuits can be mounted on the transfer body. That is, by using each of the above-described inventions, a thin film integrated circuit device including the thin film device transferred to the transfer body can be realized. Further, a pixel portion is configured to include a thin film transistor arranged in a matrix and a pixel electrode connected to one end of the thin film transistor, and a pixel manufactured by transferring the thin film transistor of the pixel portion.
- a liquid crystal display device having an active matrix substrate can be realized.
- FIGS. 1 to 8 are cross-sectional views showing steps of a peeling method according to a first embodiment of the present invention.
- FIGS. 9 to 16 show steps of a peeling method according to a second embodiment of the present invention.
- 17 to 22 are sectional views showing steps of a third embodiment of the method of transferring a thin film element according to the present invention.
- FIG. 23 is a diagram showing a change in transmittance of the first substrate (substrate 100 in FIG. 17) with respect to the wavelength of one laser beam.
- 24 to 34 are cross-sectional views showing the steps of a fourth embodiment of the method of transferring a thin film element according to the present invention.
- FIGS. 35 (a) and (b) are perspective views of a micro-combination manufactured using the present invention.
- FIG. 36 is a view for explaining the configuration of the liquid crystal display device.
- FIG. 37 is a diagram for explaining a configuration of a main part of the liquid crystal display device.
- FIG. 38 is a view for explaining a modification of the method for transferring a thin film element of the present invention.
- FIG. 39 is a diagram showing the correlation between the light absorption energy of the separation layer and the film thickness before the ablation when the separation layer is formed of amorphous silicon.
- FIG. 40 is a diagram showing a modified example in which an amorphous silicon layer serving as a light absorption layer is disposed on an amorphous silicon layer serving as a separation layer via a silicon-based intermediate layer.
- FIG. 41 is a view showing a modified example in which a silicon-based light absorbing layer made of a material different from that of the separation layer is disposed on the separation layer.
- FIGS. 42 (A) to (E) are diagrams showing modified examples in which a reinforcing layer for preventing deformation or destruction of a thin film device at the time of separation layer separation is arranged.
- FIG. 43 is a view for explaining a beam scanning operation to the separation layer, which is one step of the method for transferring a thin film device of the present invention.
- FIG. 44 is a plan view for explaining the beam scanning of FIG.
- FIG. 45 is a view for explaining another example of the beam scanning operation on the separation layer, which is one step of the method of transferring a thin film device of the present invention.
- FIG. 46 is a view showing the beam shown in FIG.
- FIG. 4 is a characteristic diagram showing a light intensity distribution of a beam used for a system scan.
- FIG. 47 is a characteristic diagram showing another light intensity distribution of the beam used for the beam scan shown in FIG.
- FIGS. 1 to 8 are sectional views showing the steps of the first embodiment of the peeling method of the present invention.
- FIG. Hereinafter, the steps of the peeling method (transfer method) of the present invention will be sequentially described based on these drawings.
- a separation layer (light absorption layer) 2 is formed on one surface (a separation layer forming surface 11) of a substrate 1.
- the substrate 1 When the substrate 1 is irradiated with the irradiation light 7 from the substrate 1 side, it is preferable that the substrate 1 has a light-transmitting property through which the irradiation light 7 can pass.
- the transmittance of the irradiation light 7 is preferably at least 10%, more preferably at least 50%. If the transmittance is too low, the attenuation (loss) of the irradiation light 7 increases, and a larger amount of light is required to separate the separation layer 2.
- the substrate 1 is preferably made of a highly reliable material, and particularly preferably made of a material having excellent heat resistance.
- the process temperature may be high (for example, about 350 to 100 ° C.) depending on the type and formation method.
- the range of setting of film forming conditions such as temperature conditions in forming the transferred layer 4 and the like on the substrate 1 is widened.
- the substrate 1 be made of a material having a strain point equal to or higher than T max, where T max is the maximum temperature when the transferred layer 4 is formed.
- the constituent material of the substrate 1 preferably has a strain point of 350 ° C. or more, more preferably 500 ° C. or more. Examples of such a material include heat-resistant glass such as quartz glass, soda glass, Corning 759, and NEC Glass O A-2. If the process temperature for forming the separation layer 2, the intermediate layer 3, and the transfer layer 4, which will be described later, is to be lowered, an inexpensive glass material having a low melting point and a synthetic resin may also be used for the substrate 1. it can.
- the thickness of the substrate 1 is not particularly limited, it is usually preferably about 0.1 to 5.0 mm, more preferably about 0.5 to 1.5 mm. If the thickness of the substrate 1 is too thin, the strength is reduced. If the thickness of the substrate 1 is too small, the irradiation light 7 tends to be attenuated when the transmittance of the substrate 1 is low. When the transmittance of the irradiation light 7 of the substrate 1 is high, the thickness may exceed the upper limit.
- the thickness of the separation layer forming portion of the substrate 1 is set so that the irradiation light 7 can be uniformly irradiated. Preferably it is uniform.
- the separation layer forming surface 11 and the irradiation light incidence surface 12 of the substrate 1 are not limited to the flat surface as shown, but may be a curved surface.
- the substrate 1 is not removed by etching or the like, but the separation layer 2 between the substrate 1 and the transferred layer 4 is peeled off and the substrate 1 is separated. There is a wide range of choices for the substrate 1 such as using a relatively thick substrate.
- the separation layer 2 absorbs the irradiation light 7 described below, and peels off in the layer and / or at the interface 2 a or 2 b (hereinafter, “in-layer peeling j,
- the irradiation force of the irradiation light 7 eliminates or reduces the bonding force between the atoms or molecules of the material constituting the separation layer 2.
- the occurrence of abrasion or the like leads to delamination in the layer and / or interfacial delamination.
- gas may be released from the separation layer 2 and the separation effect may be exhibited. In other words, when the components contained in the separation layer 2 are released as gas,
- composition of the separation layer 2 examples include the following (1) to (4).
- This amorphous silicon may contain H (hydrogen).
- the content of H is preferably about 2 &% or more, and more preferably about 2 to 20 at%.
- H content in the amorphous silicon is adjusted by appropriately setting the conditions for film formation, such as the gas composition, gas pressure, gas atmosphere, gas flow rate, temperature, substrate temperature, and input power in CVD. be able to.
- Various oxide ceramics such as silicon oxide or silicic acid compound, titanium oxide or titanic acid compound, zirconium oxide or zirconic acid compound, lanthanum oxide or lanthanic acid compound, dielectric (ferroelectric) or semiconductor: Examples of the oxidation Kei-containing, SiO, S i0 2, S i 3 0 2 , and examples of Kei acid compound, e.g., K 2 S i0 3, Li 2 S i0 3, CaS i0 3, Z rSi0 4, Na 2 S i0 3 and the like.
- Titanium oxide of the, T iO, Ti 2 0 3 , Ti0 2 , and examples of titanate compounds for example, BaTi 0 There BaT i 0 3, Ba 2 Ti 9 O 20, BaTi 5 0 ", CaT the i 0 3, S r Ti0 3 , PbTi0 3, MgTi0 3, ZrTi0 2, SnT i0 4, A1 2 TiO physician FeTi0 3 and the like.
- zirconate compound is, for example, B a Z r0 3, Z r S i 0 4, PbZr0 3, MgZr0 3, K 2 Zr0 3 and the like.
- Ceramics or dielectrics such as PZT, PLZT, PLLZT, PBZT:
- Nitride ceramics such as silicon nitride, aluminum nitride, and titanium nitride:
- the organic polymer material may have an aromatic hydrocarbon (one or more benzene rings or a condensed ring thereof) in the structural formula.
- Specific examples of such organic polymer materials include polyolefins such as polyethylene and polypropylene, polyimides, polyamides, polyesters, and polymethyl methacrylate.
- PMMA polyphenylene sulfide
- PPS polyether sulfone
- Examples of the metal include Al, Li, Ti, Mn, In, Sn, Y, La, Ce, Nd, Pr, Gd, Sm, and an alloy containing at least one of these.
- the thickness of the separation layer 2 depends on the purpose of peeling, the composition of the separation layer 2, the layer structure, the formation method, and the like. Normally, 1 ⁇ ! It is preferably about 20 m, and 1 ⁇ ! About 2 nm, more preferably about 40 nm to 1 ⁇ m. If the film thickness of the separation layer 2 is too small, the uniformity of the film formation may be impaired, and the ⁇ ij separation may be uneven, and if the film thickness is too small, good separation properties of the separation layer 2 are ensured. It is necessary to increase the power (light amount) of the irradiation light 7 in order to perform the operation, and it takes time to remove the separation layer 2 later. The thickness of the separation layer 2 is preferably as uniform as possible.
- the method for forming the separation layer 2 is not particularly limited, and is appropriately selected according to various conditions such as a film composition and a film thickness.
- CVD including MOCVD, low pressure CVD, ECR-CVD
- vapor deposition molecular beam deposition (MB)
- sputtering ion plating
- various vapor deposition methods such as PVD, electric plating, immersion plating (diving)
- plating methods such as electroless plating, Langmuir's broth (LB) method, coating methods such as sbin coat, spray coat and roll coat, various printing methods, transfer methods, ink jet methods, powder jet methods, etc. It can also be formed by combining two or more of these.
- the composition of the separation layer 2 is amorphous silicon (a-Si)
- a-Si amorphous silicon
- the separation layer 2 is made of a ceramic by a sol-gel method or when it is made of an organic polymer material, it is preferable to form a film by a coating method, particularly spin coating.
- the formation of the separation layer 2 may be performed in two or more steps (for example, a layer formation step and a heat treatment step).
- an intermediate layer (underlayer) 3 is formed on the separation layer 2.
- This intermediate layer 3 is formed for various formation purposes.
- a protective layer for example, a protective layer, an insulating layer, a conductive layer, an irradiation light, which physically or chemically protects a transferred layer 4 described later during manufacturing or use. 7, a barrier layer that prevents migration (migration) of components to or from the layer 4 to be transferred, or a layer that exhibits at least one of functions as a reflective layer.
- the composition of the intermediate layer 3 is appropriately set according to the purpose of the formation.
- the composition between the separation layer 2 of amorphous silicon and the transfer layer 4 of a thin film transistor is formed.
- the intermediate layer 3 to be made include oxidation Kei containing such S i 0 2, in the case of the intermediate layer 3 formed between the transferred layer 4 by the separation layer 2 and the PZT, for example , Pt, Au, W, Ta, Mo, Al, Cr, Ti or a metal such as an alloy based on these.
- the thickness of the intermediate layer 3 is appropriately determined depending on the purpose of forming the intermediate layer 3 and the degree of the function that can be exhibited, but it is usually preferably about 10 nm to 5 ⁇ m, and preferably about 40 nm. ⁇ ! More preferably, it is about Also, the method for forming the intermediate layer 3 is the same as the method for forming the intermediate layer 3. The formation of the intermediate layer 3 may be performed in two or more steps.
- the intermediate layer 3 may be formed of two or more layers having the same or different composition.
- the transfer layer 4 may be formed directly on the separation layer 2 without forming the intermediate layer 3.
- a layer to be transferred (object to be peeled) 4 is formed on the intermediate layer 3.
- the transfer layer 4 is a layer to be transferred to a transfer body 6 described later, and can be formed by the same method as the formation method described above for the separation layer 2.
- a thin film particularly a functional thin film or a thin film
- a thin film is a membrane device.
- Functional thin films and thin film devices include, for example, thin film transistors, thin film diodes, other thin film semiconductor devices, electrodes (eg, transparent electrodes such as ITO and mesa films), photoelectric cells used in solar cells and image sensors, etc.
- Recording elements such as conversion elements, switching elements, memories, piezoelectric elements, etc., micromirrors (piezoelectric film ceramics), magnetic recording media, magneto-optical recording media, optical recording media, etc., magnetic recording film heads , Coils, Induct, Yuichi, High-permeability materials, and micro magnetic devices combining them, optical filters, reflective films, dichroic mirrors, optical thin films such as polarizing elements, semiconductor thin films, superconducting thin films (eg: YBCO thin film), magnetic thin film, metal multilayer thin film, metal ceramic multilayer thin film, metal semiconductor multilayer thin film, ceramic A thin semiconductor multi-layer film, multilayer thin film of the organic thin film and other objects quality thereof.
- thin-film devices thin-film devices, micro-magnetic devices, micro-three-dimensional structures, actuary, micro-mirrors, etc. It is highly useful and preferable for application to
- the transfer layer 4 may be a single layer or a laminate of a plurality of layers. Furthermore, a predetermined patterning may be performed like the thin film transistor. The formation (lamination) and patterning of the transfer-receiving layer 4 are performed by a predetermined method according to the method. Such a transferred layer 4 is usually formed through a plurality of steps. The formation of the transfer-receiving layer 4 by the thin film transistor is described in, for example, Japanese Patent Publication No. 2-50630, H. Ohshima et al: International Symposium Digest of Technical Papers SID 1983, "B / W and Color LC Video Display Addressed. by Poly Si TFTs ".
- the thickness of the transferred layer 4 is not particularly limited, and is appropriately set according to various conditions such as the purpose of formation, function, composition, and characteristics.
- the total thickness thereof is preferably about 0.5 to 200 m, more preferably about 0.5 to 1. In the case of other thin films, a suitable total thickness may be in a wider range, for example, about 50 nm to about 100 / m.
- the layer 4 to be transferred is not limited to a thin film as described above, and may be, for example, a thick film such as a coating film sheet, or a film (layer) such as a powder.
- the material to be transferred or the material to be peeled, which does not constitute the above, may be used.
- an adhesive layer 5 is formed on the layer to be transferred (object to be peeled) 4, and the transfer body 6 is bonded (joined) via the adhesive layer 5.
- the adhesive constituting the adhesive layer 5 include various curable adhesives such as a reactive curable adhesive, a thermosetting adhesive, a light curable adhesive such as an ultraviolet curable adhesive, and an anaerobic curable adhesive.
- An adhesive may be used.
- the composition of the adhesive for example, any of epoxy-based, acrylic-based, and silicone-based adhesives may be used.
- Such an adhesive layer 5 is formed by, for example, a coating method.
- the curable adhesive When using the curable adhesive, for example, apply a curable adhesive on the transfer target layer 4, After bonding a transfer member 6 described later thereon, the curable adhesive is cured by a curing method according to the characteristics of the curable adhesive, and the transfer-receiving layer 4 and the transfer member 6 are bonded and fixed. .
- a photo-curable adhesive When a photo-curable adhesive is used, the translucent transfer body 6 is placed on the uncured adhesive layer 5, and then the adhesive is cured by irradiating curing light from above the transfer body 6. It is good. If the substrate 1 has a light-transmitting property, it is preferable to cure the adhesive by irradiating curing light from both sides of the substrate 1 and the transfer body 6 to ensure the curing.
- an adhesive layer 5 may be formed on the transfer body 6 side, and the transferred layer 4 may be bonded thereon. Further, an intermediate layer as described above may be provided between the transferred layer 4 and the adhesive layer 5. Further, for example, when the transfer body 6 itself has an adhesive function, the formation of the adhesive layer 5 may be omitted.
- the transfer body 6 is not particularly limited, but includes a substrate (plate material), particularly a transparent substrate. Note that such a substrate may be a flat plate or a curved plate. Further, the transfer body 6 may be inferior to the substrate 1 in properties such as heat resistance and corrosion resistance. The reason is that, in the present invention, the transferred layer 4 is formed on the substrate 1 side, and then the transferred layer 4 is transferred to the transfer body 6, so that the characteristics required for the transfer body 6, particularly the heat resistance, are as follows. This is because it does not depend on the temperature conditions and the like when forming the transferred layer 4.
- the transfer body 6 is made of a material having a glass transition point (T g) or softening point of preferably 800 ° C. or less, more preferably 500 nC or less, and still more preferably 320 ° C. or less. can do.
- the mechanical properties of the transfer body 6 those having a certain degree of rigidity (strength) are preferable, but those having flexibility and elasticity may be used.
- the constituent material of the transfer body 6 include various synthetic resins and various glass materials. In particular, various synthetic resins and ordinary (low melting point) inexpensive glass materials are preferable.
- the synthetic resin may be any of a thermoplastic resin and a thermosetting resin.
- examples thereof include polyolefins such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer (EVA), cyclic polyolefin, and modified resins.
- Po Polyolefin polyvinyl chloride, polyvinylidene chloride, polystyrene, polyamide, polyimide, polyamide, polyimide, polycarbonate, poly (4-methylpentene-1), ionomer, acrylic resin, polymethyl methacrylate (PMMA), Acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-styrene copolymer (AS resin), butadiene-styrene copolymer, polyoxymethylene, polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer ( EVOH), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexane terephthalate (PCT), etc., polyester, polyether, polyetherketone (PEK), polyetheretherketone (PEEK) :), poly 1-terimide, polyacetylene (POM), polyphenylene oxide,
- the glass material examples include silicate glass (quartz glass), alkali glass silicate, soda lime glass, potassium lime glass, lead (alkali) glass, barium glass, and borosilicate glass.
- silicate glass quartz glass
- alkali glass silicate soda lime glass
- potassium lime glass potassium lime glass
- lead (alkali) glass barium glass
- borosilicate glass examples include silicate glass (quartz glass), alkali glass silicate, soda lime glass, potassium lime glass, lead (alkali) glass, barium glass, and borosilicate glass.
- silicate glass soda lime glass
- potassium lime glass soda lime glass
- lead (alkali) glass soda lime glass
- barium glass barium glass
- borosilicate glass borosilicate glass.
- those other than silicate glass are preferable because they have a lower melting point than silicate glass, are relatively easy to mold and process, and are inexpensive.
- the large transfer member 6 can be integrally molded, and the transfer member 6 may have a complicated shape such as one having a curved surface or unevenness.
- Various shapes can be easily manufactured, and various advantages such as low material cost and low manufacturing cost can be enjoyed. Therefore, large and inexpensive devices (for example, liquid crystal displays) can be easily manufactured.
- the transfer body 6 is, for example, a device constituting an independent device such as a liquid crystal cell, or a part of the device such as a color filter, an electrode layer, a dielectric layer, an insulating layer, or a semiconductor element. May be constituted. Further, the transfer body 6 may be a material such as metal, ceramics, stone, wood, paper, or the like, or on any surface constituting a certain product (on a clock, on an air conditioner, on a printed circuit board, On the surface of a structure such as a wall, a pillar, a beam, a ceiling, or a window glass.
- the irradiation light 7 is irradiated from the back side of the substrate 1 (the irradiation light incident surface 12 side). After being transmitted through the substrate 1, the irradiation light 7 irradiates the separation layer 2 from the interface 2 a side. As a result, as shown in FIG. 6 or 7, in-layer peeling and / or interfacial peeling occurs in the separation layer 2 and the bonding force decreases or disappears, so that when the substrate 1 and the transfer body 6 are separated from each other. Then, the transferred layer 4 is separated from the substrate 1 and transferred to the transfer body 6.
- FIG. 6 shows a case where separation within the separation layer 2 has occurred
- FIG. 7 shows a case where separation has occurred at the interface 2 a in the separation layer 2.
- the principle of the separation within the separation layer 2 and / or the interfacial separation occurring is that abrasion occurs in the constituent material of the separation layer 2 and that the gas contained in the separation layer 2 is released. Is presumed to be due to phase changes such as melting and transpiration occurring immediately after irradiation.
- ablation means that a solid material (a material of the separation layer 2) that has absorbed the irradiation light is excited photochemically or thermally, and the surface or internal bonds of atoms or molecules are cut and released. It mainly appears as a phenomenon in which all or a part of the constituent material of the separation layer 2 undergoes a phase change such as melting and evaporation (vaporization). In addition, the phase change may cause a minute foaming state, and the bonding force may be reduced. Whether the separation layer 2 causes intra-layer separation, interfacial separation, or both, depends on the composition of the separation layer 2 and various other factors. Conditions such as type, wavelength, intensity, and depth of arrival.
- Irradiation light 7 may be any as long as it causes intra-layer separation and / or interfacial separation in separation layer 2, such as X-rays, ultraviolet rays, visible light, infrared rays (heat rays), laser light, and millimeters. Examples include waves, microwaves, electron beams, and radiations (strings, ⁇ -lines, and a-lines). Among them, the laser beam is more likely to cause separation (ablation) of the separation layer 2. preferable.
- the laser device for generating the laser beam various gas lasers, solid-state laser is (semiconductor laser) and the like, excimer one
- The, N d-YA G laser, A r laser, C 0 2 laser, CO laser, A He-Ne laser or the like is preferably used, and among them, an excimer laser is particularly preferred. Since excimer lasers output high energy in a short wavelength range, they can cause abrasion in the separation layer 2 in a very short time, so that the intermediate layer 3, the transfer layer 4, and the substrate For example, the separation layer 2 can be peeled off with almost no increase in temperature, that is, without causing deterioration or damage.
- the wavelength of the laser light to be irradiated is preferably about 100 to 350 nm.
- the wavelength of the laser light to be applied is about 350 to 1200 nm. Is preferred.
- the energy density of the irradiated laser beam is preferably about 100 to 500 OmJ / cm 2 , and 100 to 100 OmJ. / cm 2 is more preferable.
- the irradiation time is preferably about 1 to 100 Onsec, more preferably about 10 to 100 Onsec. If the energy density is low or the irradiation time is short, sufficient abrasion or the like will not occur, and if the energy density is high or the irradiation time is long, transfer is performed by the irradiation light transmitted through the separation layer 2 and the intermediate layer 3. May have an adverse effect on Layer 4.
- Irradiation light 7 typified by such laser light is illuminated so that its intensity becomes uniform. It is preferably fired.
- the irradiation direction of the irradiation light 7 is not limited to the direction perpendicular to the separation layer 2 but may be a direction inclined at a predetermined angle with respect to the separation layer 2.
- the irradiation light can be irradiated to the entire region of the separation layer 2 in plural times. The same location may be irradiated more than once. Further, different types and different wavelengths (wavelength ranges) of irradiation light (laser light) may be applied to the same region or different regions more than once.
- the separation layer 2 adhering to the intermediate layer 3 is removed by, for example, a method such as cleaning, etching, assembling, polishing, or a combination thereof. In the case of separation within the separation layer 2 as shown in FIG. 6, the separation layer 2 adhering to the substrate 1 is also removed.
- the substrate 1 is made of an expensive or rare material such as quartz glass
- the substrate 1 is preferably provided for reuse.
- the present invention can be applied to the substrate 1 to be reused, and is highly useful.
- the transfer of the transferred layer 4 to the transfer member 6 is completed. After that, removal of the intermediate layer 3 adjacent to the transferred layer 4 and formation of another arbitrary layer can be performed.
- the transferred layer 4 itself which is the object to be peeled, is not directly peeled but is separated at the separation layer 2 joined to the transferred layer 4, the properties of the object to be peeled (transferred layer 4) are obtained. Irrespective of conditions, conditions, etc., it can be easily and reliably peeled (transferred) uniformly, without damage to the object to be peeled (transferred layer 4) due to the peeling operation, and high transfer layer 4 Reliability can be maintained.
- the transfer method of the present invention may not perform such transfer.
- a material to be peeled is used instead of the above-described layer 4 to be transferred.
- the object to be peeled may be either a layered material or a material that does not constitute a layer.
- the purpose of peeling the object is, for example, the removal (trimming) of an unnecessary portion of the thin film (particularly the functional thin film) as described above, the removal of an adhering substance such as dust, oxide, heavy metal, carbon, and other impurities. Removal, recycling of substrates etc. using it There may be.
- the transfer member 6 is not limited to the above-described material, and may be a material having completely different properties from the substrate 1 (regardless of light transmission), such as various metal materials, ceramics, carbon, paper, and rubber. May be configured.
- the transfer body 6 is a material that cannot directly form the transfer-receiving layer 4 or is not suitable for forming the transfer-receiving layer 4, the value of applying the present invention is high.
- the irradiation light 7 is irradiated from the substrate 1 side.
- the irradiation direction of the irradiation light 7 is not limited to the above, and the irradiation light may be irradiated from the side opposite to the substrate 1.
- the transfer layer 4 may be peeled or transferred in the above-described pattern by irradiating the irradiation light partially in the surface direction of the separation layer 2, that is, in a predetermined pattern. Method) .
- the irradiation light incident surface 12 of the substrate 1 is subjected to masking corresponding to the pattern and irradiated with the irradiation light 7, or the irradiation position of the irradiation light 7 It can be performed by a method such as precisely controlling the temperature.
- the separation layer 2 can be formed in a predetermined pattern (second method).
- a method in which the separation layer 2 is formed in a predetermined pattern by masking or the like in advance, or a method in which the separation layer 2 is formed on the entire surface of the separation layer formation surface 11 and then patterned or trimmed by etching or the like is possible. It is.
- the transfer of the transferred layer 4 can be performed together with the patterning and trimming.
- the transfer may be repeated two or more times by the same method as described above.
- the number of times of transfer is an even number, the positional relationship between the front and back of the layer to be transferred formed on the last transfer body should be the same as the state where the layer to be transferred was first formed on the substrate 1. Can be.
- a large transparent substrate for example, an effective area of 90 Omm 160 Omm
- a small substrate 1 for example, an effective area of 45 mm x 4 Omm
- a liquid crystal display of the same size as the transparent substrate can be manufactured.
- a quartz substrate (softening point: 1630.C, strain point: 1070 ° C, excimer laser transmittance: approximately 100%) with a thickness of 5 mm and a thickness of 5 mm is prepared.
- An amorphous silicon (a-Si) film was formed on one side as a separation layer (laser light absorbing layer) by low-pressure CVD (Si 2 H 6 gas, 425 ° C). The thickness of the separation layer was 100 nm.
- the S i 0 2 film as the intermediate layer ECR-CVD method (S i H 4 + 0 2 gas, 100 ° C) was formed by.
- the thickness of the intermediate layer was 200 nm.
- a polycrystalline (poly) silicon film with a thickness of 5 Onm was formed as a layer to be transferred on the intermediate layer by a CVD method (Si 2 H 6 gas).
- predetermined patterning was performed on the polysilicon film to form a region serving as a source, a drain, and a channel of the thin film transistor. After this, 1000.
- the gate electrode on the gate insulating film (high-melting-point metal such as Mo on polysilicon are laminated structure)
- the source and drain regions were formed in a self-aligned manner (self-aligned) by ion implantation using the gate electrode as a mask to form a thin film transistor. Note that a thin film transistor having similar characteristics can be formed by using a low-temperature process instead of the high-temperature process as described above.
- amorphous silicon film with a thickness of 5 Si 2 H 6 gas, 425.C
- laser light wavelength 308 nm
- the polysilicon film was subjected to predetermined patterning to form a region serving as a source, a drain, and a channel of the thin film transistor.
- a gate insulating film S i0 2 on the polysilicon film by low-pressure CVD (refractory metal is laminated structure such as Mo on polysilicon) gate electrode on the gate insulating film shape formed of Then, ion implantation was performed using the gate electrode as a mask to form the source and drain regions in a self-aligned manner (self-aligned), thereby forming a thin film transistor. Thereafter, if necessary, electrodes and wires connected to the source and drain regions, and wires connected to the gate electrodes are formed. A1 is used for these electrodes and wires, but is not limited thereto. In addition, if there is a concern that A 1 will be melted by the subsequent laser irradiation, a metal having a higher melting point than A 1 (a metal that does not melt by the subsequent laser irradiation) may be used.
- an ultraviolet-curing adhesive was applied on the thin-film transistor (film thickness: 100 ⁇ m), and the coated film was transferred to a large size of 20 Omm x 30 Omm x 1.1 mm thick as a transfer body. After bonding a transparent glass substrate (soda glass, softening point: 740 ° C, strain point: 511 ° C), the adhesive was cured by irradiating ultraviolet rays from the glass substrate side, and these were bonded and fixed.
- Xe—C 1 excimer laser (wavelength: 308 nm) was irradiated from the quartz substrate side to cause peeling (intralayer peeling and interface peeling) on the separation layer.
- the energy density of the irradiated Xe—C 1 excimer laser was 30 Om J / cm 2 , and the irradiation time was 20 ns ec.
- Excimer laser irradiation includes spot beam irradiation and line beam irradiation. In the case of spot beam irradiation, a predetermined unit area (for example, 8 mm mx 8 mm) is irradiated with a spot, and this spot irradiation is applied to the unit area.
- the transfer from the quartz substrate to the glass substrate as in this embodiment is repeatedly performed on different areas in a plane, and the transfer is performed on the glass substrate. More thin film transistors than the number of thin film transistors that can be formed on a quartz substrate can be formed. Furthermore, by repeatedly laminating on a glass substrate, more thin film transistors can be formed as well.
- the transfer of the thin film transistor was performed in the same manner as in Example 1 except that the separation layer was an amorphous silicon film containing 20 at% of H (hydrogen).
- the amount of H in the amorphous silicon film was adjusted by appropriately setting the conditions at the time of film formation by the low-pressure CVD method.
- the transfer of the thin film transistor was performed in the same manner as in Example 1 except that the separation layer was a ceramic thin film (composition: PbTiO 3 , film thickness: 20 Onm) formed by a sol-gel method by spin coating.
- the separation layer was a ceramic thin film (composition: PbTiO 3 , film thickness: 20 Onm) formed by a sol-gel method by spin coating.
- the separation layer a ceramic thin film formed by sputtering (composition: BaTi 0 3, film thickness: 40 onm) except for using in the same manner as in Example 1, was transferred a thin film transistor evening.
- Example 6 The separation layer, a laser ablation over Chillon formed ceramic thin film (composition: Pb (Z r, Ti) 0 3 (PZT), thickness: 5 onm) except for using in the same manner as in Example 1, the carrying film Transistor transfer was performed. (Example 6)
- the transfer of the thin film transistor was performed in the same manner as in Example 1 except that the separation layer was a polyimide film (thickness: 20 Onm) formed by spin coating.
- the transfer of the thin film transistor was performed in the same manner as in Example 1 except that the separation layer was a polyphenylene sulfide film (thickness: 20 Onm) formed by spin coating.
- the transfer of the thin film transistor was performed in the same manner as in Example 1 except that the separation layer was an A1 layer (thickness: 30 Onm) formed by sputtering.
- a thin film transistor was transferred in the same manner as in Example 2 except that a Kr-F excimer laser (wavelength: 248 nm) was used as irradiation light.
- the energy density of the irradiated laser was 25 OmJ / cm 2 , and the irradiation time was 20 nsec. (Example 10)
- the transfer of the thin film transistor was performed in the same manner as in Example 2 except that an Nd—YAIG laser (wavelength: 1068 nm) was used as the irradiation light.
- the energy density of the irradiated laser was 40 Om J / cm 2 , and the irradiation time was 20 nsec.
- a thin film transistor was transferred in the same manner as in Example 1 except that a thin film transistor having a polysilicon film (thickness: 80 nm) was formed by a high-temperature process at 1000 ° C. as a layer to be transferred.
- a thin film transistor was transferred in the same manner as in Example 1 except that a transparent substrate made of polycarbonate (glass transition point: 130 ° C) was used as a transfer body.
- Example 14 The transfer of the thin film transistor was performed in the same manner as in Example 2 except that a transparent substrate made of an AS resin (glass transition point: 70 to 90 ° C.) was used as the transfer body.
- the transfer of the film membrane was performed in the same manner as in Example 3 except that a transparent substrate made of polymethyl methacrylate (glass transition point: 70 to 90.C) was used as the transfer body.
- a thin film transistor was transferred in the same manner as in Example 5 except that a transparent substrate made of polyethylene terephthalate (glass transition point: 67.C) was used as a transfer body. (Example 16)
- the transfer of the thin film transistor was performed in the same manner as in Example 6, except that a transparent substrate made of high-density polyethylene (glass transition point: 77 to 90 ° C) was used as the transfer body.
- the transfer of the thin film transistor was performed in the same manner as in Example 9, except that a transparent substrate made of polyamide (glass transition point: 144 ° C.) was used as a transfer break.
- the thin film transistor was transferred in the same manner as in Example 10 except that a transparent substrate made of an epoxy resin (glass transition point: 120 ° C.) was used as the transfer body.
- a thin film transistor was transferred in the same manner as in Example 11 except that a transparent substrate made of polymethyl methacrylate (glass transition point: 70 to 90.C) was used as a transfer body.
- the peeling method of the present invention the peeling can be easily and surely performed regardless of the properties, conditions, and the like of the material to be peeled (the layer to be transferred). Transfer to various transfer members becomes possible. For example, for materials that cannot be formed directly or are not suitable for forming thin films, materials that are easy to mold, materials that are inexpensive, large objects that are difficult to move, etc. , Shape it by transcription Can be achieved.
- the transfer body materials having inferior properties such as heat resistance and corrosion resistance as compared to the substrate material, such as various synthetic resins and glass materials having a low melting point, can be used. Therefore, for example, when manufacturing a liquid crystal display in which thin film transistors (especially polysilicon TFTs) are formed on a transparent substrate, a quartz glass substrate with excellent heat resistance is used as the substrate, and various synthetic resins and melting points are used as the transfer body. By using a transparent substrate made of an inexpensive and easily added material such as a low glass material, a large and inexpensive liquid crystal display can be easily manufactured. These advantages are not limited to liquid crystal displays, but apply to the manufacture of other devices.
- a transfer layer such as a functional thin film is formed on a highly reliable substrate, particularly a substrate having high heat resistance such as a quartz glass substrate. Since patterning can be performed, a highly reliable functional film can be formed on the transfer body regardless of the material properties of the transfer body.
- the separation layer 2 of the first embodiment has a multilayer structure of a plurality of layers.
- FIG. 9 to 16 are cross-sectional views showing steps of an embodiment of the peeling method of the present invention.
- the steps of the peeling method (transfer method) of the present invention will be sequentially described based on these drawings. It should be noted that since there are many items in common with the first embodiment, the same reference numerals are given to the common components, but detailed description is omitted as appropriate. However, a description will be added for parts different from the first embodiment.
- a separation layer 2 composed of a laminate of a plurality of layers is formed on one side (a separation layer formation surface 11) of a substrate 1.
- the separation layer 2 is provided in order from a layer closer to the substrate 1 by a method described later.
- the substrate 1 is irradiated with the irradiation light 7 from the substrate 1 side, it is preferable that the substrate 1 has a light-transmitting property through which the irradiation light 7 can be transmitted.
- the transmittance of the irradiation light 7 is the same as in the first embodiment.
- the material of the substrate 1 is the same as that of the first embodiment. Further, the thickness of the substrate 1 is the same as in the first embodiment.
- the thickness of the separation layer forming portion of the substrate 1 is preferably uniform so that the irradiation light 7 can be uniformly irradiated. Further, the separation layer forming surface 11 and the irradiation light incidence surface 12 of the substrate 1 are not limited to the flat surface as shown, but may be a curved surface.
- the substrate 1 is not removed by etching or the like, but the separation layer 2 between the substrate 1 and the transferred layer 4 is peeled off to separate the substrate 1, so that the work is easy and For example, there is a wide range of options for the substrate 1 such as using a relatively thick substrate.
- the separation layer 2 has such a property as to absorb the irradiation light 7 described below and cause peeling in the layer and / or at the interface (hereinafter, referred to as “intralayer peeling” and “interfacial peeling”).
- the separation layer 2 includes at least two layers having different compositions or characteristics.
- the light absorption layer 21 that absorbs the irradiation light 7 is different from the light absorption layer 21 that has a different composition or characteristics. It is preferable to include the following layers. Further, it is preferable that the other layer is a light-shielding layer (reflection layer 22) that shields the irradiation light 7.
- This light-shielding layer is located on the opposite side (upper side in the figure) of the light absorbing layer 21 from the incident direction of the irradiation light 7 and reflects or absorbs the irradiation light 7 so that the irradiation light 7 is transferred to the transfer target layer. It has the function of preventing or suppressing intrusion into the 4 side.
- a reflection layer 22 that reflects the irradiation light 7 is formed as a light-shielding layer.
- the reflection layer 22 preferably transmits the irradiation light 7 by 10% or more, more preferably 30% or more. What is necessary is just to be able to reflect at a reflectance of.
- Examples of such a reflective layer 22 include a metal thin film formed of a single layer or a plurality of layers, and an optical thin film formed of a laminate of a plurality of thin films having different refractive indices. For these reasons, it is preferable that the metal layer is mainly composed of a metal thin film.
- the constituent metals of the metal film include, for example, Ta, W, Mo, Cr, Ni, Co, Ti, Pt, Pd, Ag, A Us All, and the like. And alloys containing at least one of the following as basic components.
- a preferable additive element constituting the alloy Is for example, Fe, Cu, C, Si, B. By adding these, the thermal conductivity and the reflectance can be controlled.
- the reflective layer 22 is formed by physical vapor deposition, there is an advantage that a sunset can be easily manufactured.
- alloying has the advantage that it is easier to obtain materials than pure metals and has lower costs.
- the thickness of such a reflection layer (light-shielding layer) 22 is not particularly limited, but usually, 1 ⁇ ! About 10 m, more preferably about 50 nm to 5 m. If the thickness is too large, it takes time to form the reflective layer 22, and it takes time to remove the reflective layer 22 later. If the thickness is too small, the light-shielding effect may be insufficient depending on the film composition.
- the light absorbing layer 21 is a layer that contributes to the separation of the separation layer 2, absorbs the irradiation light 7, and loses or decreases the bonding force between atoms or molecules of the substance constituting the light absorbing layer 21. Phenomenologically, abrasion and the like may result in intra-layer delamination and / or interfacial delamination. Further, by the irradiation of the irradiation light 7, gas may be released from the light absorbing layer 21 to exert a separation effect. That is, the case where the component contained in the light absorption layer 21 is released as a gas, and the case where the separation layer 2 absorbs light and turns into a gas for a moment, and the vapor is released to contribute to separation. There is.
- composition of such a light absorbing layer 21 the same composition as the compositions (1) to (4) described in the separation layer 2 of the first embodiment can be used.
- the following composition can be used for the light absorbing layer 21 in addition to the above.
- Good for example, polyolefins such as polyethylene and polypropylene, polyimides, polyamides, polyesters, polymethyl methacrylate (PMMA), polyphenylene sulfide (PPS), polyether Rusulfone (PES), epoxy resin and the like.
- Metals include, for example, Al, Li, Ti, Mn, In, Sn, rare earth metals such as Y, La, Ce, Nd, Pr, Sm, Gd, or at least one of these. Alloys containing one type are included.
- Specific examples include a hydrogen storage alloy of a rare earth transition metal compound such as LaNi 5 or a hydrogen storage alloy of a Ti-based or Ca-based hydrogen storage alloy.
- rare earth iron examples include rare earth iron, rare earth cobalt, rare earth nickel, and rare earth manganese compounds such as Sm—Fe and Nd—C0 compounds in which nitrogen is occluded.
- the thickness of the light-absorbing layer 21 varies depending on conditions such as the purpose of peeling and the composition, layer configuration, and forming method of the separation layer 2, but it is usually preferably about 1 nm to 20 m. It is more preferably about 10 nm to 2> m, and further preferably about 40 nm to 1 ⁇ m. If the thickness of the light-absorbing layer 21 is too small, the uniformity of film formation may be impaired, and uneven peeling may occur. If the thickness of the light-absorbing layer 21 is too large, good peelability is ensured. However, it is necessary to increase the power (light amount) of the irradiation light 7, and it takes time to remove the separation layer 2 later.
- the thickness of the light absorption layer 21 and the reflection layer 22 is preferably as uniform as possible. Further, for the same reason as described above, the total thickness of the separation layer 2 is more preferably about 2 nm to 50 ⁇ m, and further preferably about 20 nm to 20 m.
- the method for forming each of the layers constituting the separation layer 2 is not particularly limited, and is appropriately selected according to various conditions such as a film composition and a film thickness.
- CVD including MOCVD, low-pressure CVD, ECR-CVD), vapor deposition, molecular beam deposition (MB), sputtering, ion plating, PVD, and other gas-phase deposition methods, electric plating, immersion plating (diving) , Electroless plating and other plating methods, Langmuir's Projet (LB) method, Subincoat, Subureko And various coating methods, a transfer method, an ink jet method, a powder jet method, and the like, and a combination of two or more of these methods can be used.
- the method of forming the light absorbing layer 21 and the reflecting layer 22 may be the same or different, and is appropriately selected according to the composition and the like.
- the composition of the light absorption layer 21 is amorphous silicon (a-Si)
- a-Si amorphous silicon
- the light-absorbing layer 21 is made of a ceramic by a solugel method or made of an organic polymer material
- the reflection layer 22 made of a metal thin film is preferably formed by vapor deposition, molecular beam deposition (MB), laser ablation vapor deposition, sputtering, ion plating, the above-mentioned various plating, and the like.
- each layer constituting the separation layer 2 may be formed in two or more steps (for example, a layer forming step and a heat treatment step).
- an intermediate layer (underlayer) 3 is formed on the separation layer 2.
- the intermediate layer 3 is formed for various formation purposes. For example, a protective layer, an insulating layer, a conductive layer, an irradiation light, which physically or chemically protects a transferred layer 4 described later during manufacturing or use. And (b) a barrier layer that prevents migration of components to or from the transferred layer 4 (a migration layer), and a material that exhibits at least one of functions as a reflective layer.
- the composition of the intermediate layer 3 is appropriately set according to the purpose of its formation, and is formed, for example, between the separation layer 2 including the light absorption layer 21 made of amorphous silicon and the transfer layer 4 made of a thin film transistor.
- the intermediate layer 3 is oxidized Kei containing the levator Gerare such S i0 2
- the intermediate layer 3 formed between the separation layer 2 and the transfer layer 4 by the PZT, Pt, Au examples include metals such as W, Ta, Mo, Al, Cr, Ti or alloys mainly containing these.
- the thickness of such an intermediate layer 3 is the same as in the first embodiment. Also, the method of forming the intermediate layer 3 is the same as in the first embodiment.
- the intermediate layer 3 may be formed of two or more layers having the same or different composition.
- the transfer layer 4 may be formed directly on the separation layer 2 without forming the intermediate layer 3.
- a layer to be transferred (object to be peeled) 4 is formed on the intermediate layer 3.
- the transfer layer 4 is a layer to be transferred to a transfer body 6 described later, and can be formed by the same method as the formation method described above for the separation layer 2.
- the purpose, type, form, structure, composition, physical or chemical properties, etc., of the layer 4 to be transferred are not particularly limited. It is preferably a film or a thin film deposition. Examples of the functional thin film and the thin film device are the same as in the first embodiment.
- Such a functional thin film or thin film device is usually formed through a relatively high processing temperature in relation to a method of forming the thin film device. Therefore, in this case, as described above, the substrate 1 needs to have a high reliability that can withstand the process temperature.
- the transfer layer 4 may be a single layer or a laminate of a plurality of layers. Furthermore, a predetermined patterning may be performed like the thin film transistor. The formation (lamination) and patterning of the transfer-receiving layer 4 are performed by a predetermined method according to the method. Such a transferred layer 4 is usually formed through a plurality of steps. Further, the thickness of the transferred layer 4 is also the same as that of the first embodiment.
- an adhesive layer 5 is formed on a layer to be transferred (object to be peeled) 4, and a transfer body 6 is bonded (joined) via the adhesive layer 5.
- Preferred examples of the adhesive forming the adhesive layer 5 are the same as those in the first embodiment.
- a curable adhesive for example, a curable adhesive is applied on the transfer-receiving layer 4, and a transfer member 6 described later is bonded thereon, and then cured by a curing method according to the characteristics of the curable adhesive. The mold adhesive is cured, and the transfer receiving layer 4 and the transfer body 6 are bonded and fixed.
- the translucent transfer body 6 is disposed on the adhesive layer 5, light is irradiated from above the transfer body 6 to cure the adhesive. Further, if the substrate 1 is translucent, it is preferable to cure the adhesive by irradiating light from both sides of the substrate 1 and the transfer body 6, since the curing can be surely performed.
- an adhesive layer 5 may be formed on the transfer body 6 side, and the transferred layer 4 may be bonded thereon. Further, an intermediate layer as described above may be provided between the transferred layer 4 and the adhesive layer 5. Also, for example, when the transfer body 6 itself has an adhesive function, The formation of the deposition layer 5 may be omitted.
- the example of the transfer body 6, its material, and its characteristics are the same as those in the first embodiment.
- the irradiation light 7 is irradiated from the back surface side of the substrate 1 (the irradiation light incident surface 12 side). After being transmitted through the substrate 1, the irradiation light 7 is applied to the separation layer 2 from the interface 2 a side. More specifically, a part of the irradiation light 7 which is irradiated and absorbed by the light absorption layer 21 and cannot be absorbed by the light absorption layer 21 is reflected by the reflection layer 22 and again in the light absorption layer 21. Through. As a result, separation within the separation layer 2 and / or interfacial separation occurs in the separation layer 2 and the bonding force decreases or disappears. As shown in FIG. 14 or FIG. 15, the substrate 1 and the transfer member 6 are separated from each other. When the layers are separated from each other, the transferred layer 4 is separated from the substrate 1 and transferred to the transfer body 6.
- FIG. 14 shows a case in which separation in the separation layer 2 has occurred
- FIG. 15 shows a case in which separation in the separation layer 2 has occurred at the interface 2a.
- the principle that separation within the separation layer 2 and / or separation at the interface occurs is that abrasion occurs in the constituent material of the light absorption layer 21, the release of gas contained in the light absorption layer 21, It is presumed to be due to phase changes such as melting and transpiration that occur immediately after irradiation.
- the abrasion means that a solid material (a constituent material of the light absorbing layer 21) that has absorbed the irradiation light is excited photochemically or thermally, and the surface or inside of the material is broken by bonding of atoms or molecules to release. It mainly appears as a phenomenon in which all or a part of the constituent materials of the light absorbing layer 21 undergo a phase change such as melting and evaporation (vaporization). In addition, the above-mentioned phase change may cause a minute foaming state, and the bonding force may be reduced.
- the separation layer 2 causes intra-layer separation, interfacial separation, or both, depends on the layer configuration of the separation layer 2, the composition and thickness of the light absorption layer 21, and other various factors. One of the factors is the conditions such as the type, wavelength, intensity, and depth of arrival of the irradiation light 7.
- the wavelength of the laser light to be irradiated is preferably about 100 to 350 nm.
- a phase change such as outgassing, vaporization, or sublimation occurs in the separation layer 2.
- the wavelength of the laser light to be irradiated is preferably about 350 to 1200 nm.
- the energy density of the laser beam irradiated is preferably a J / cm 2 approximately, 1 0 0 ⁇ 1 0 0 O More preferably, it is about m J / cm 2 .
- the irradiation time is preferably about 1 to 100 Onsec, more preferably about 10 to 100 Onsec. When the energy density is low or the irradiation time is short, sufficient abrasion does not occur, and when the energy density is high or the irradiation time is long, the separation layer 2 may be excessively broken.
- Irradiation light 7 typified by such laser light is preferably irradiated so that its intensity becomes uniform.
- the irradiation direction of the irradiation light 7 is not limited to the direction perpendicular to the separation layer 2 but may be a direction inclined at a predetermined angle with respect to the separation layer 2.
- the area of the separation layer 2 is larger than the irradiation area of one irradiation light, the entire area of the separation layer 2 can be irradiated with the irradiation light in plural times. The same location may be irradiated more than once. Also, irradiation light (laser light) of different types and different wavelengths (wavelength ranges) may be irradiated to the same region or different regions more than once.
- the reflection layer 22 is provided adjacent to the light absorption layer 21 on the side opposite to the substrate 1, the irradiation light 7 can be effectively irradiated to the light absorption layer 21 without loss.
- the light-shielding function of the reflective layer (light-shielding layer) 22 prevents the irradiation light 7 from irradiating the transfer-receiving layer 4 and the like, and prevents the transfer-receiving layer 4 from being affected by deterioration, deterioration, and the like. It has the advantage of being able to.
- being able to irradiate the light absorbing layer 21 effectively with the irradiation light 7 without any loss means that the energy density of the irradiation light 7 can be reduced accordingly, that is, the irradiation area of one irradiation can be reduced. This means that a certain area of the separation layer 2 can be peeled off with a smaller number of irradiations, which is advantageous in manufacturing.
- the separation layer 2 adhering to the intermediate layer 3 is removed by, for example, a method such as cleaning, etching, asshing, polishing, or a combination thereof.
- a method such as cleaning, etching, asshing, polishing, or a combination thereof.
- the light absorbing layer 21 attached to the substrate 1 is removed in the same manner.
- the substrate 1 is made of an expensive or rare material such as quartz glass
- the substrate 1 is preferably provided for reuse.
- the present invention can be applied to the substrate 1 to be reused, and is highly useful.
- the transfer of the transferred layer 4 to the transfer member 6 is completed. After that, removal of the intermediate layer 3 adjacent to the transferred layer 4 and formation of another arbitrary layer can be performed.
- the layer configuration of the separation layer 2 is not limited to the illustrated one.
- the separation layer 2 can be configured as a three-layer laminate in which a reflection layer is interposed between the first light absorption layer and the second light absorption layer.
- the interface between the layers constituting the separation layer 2 does not necessarily need to be clear, and the composition, the concentration of a predetermined component, the molecular structure, the physical or chemical properties, etc. change continuously near the interface. (Having a gradient).
- the transfer method of the present invention may not perform such transfer.
- the object to be peeled can be used for various purposes, for example, as in the first embodiment.
- the transfer member 6 is not limited to the above-described member, and various members can be used as in the first embodiment.
- the irradiation light 7 is irradiated from the substrate 1 side.
- the adhered matter object to be peeled
- the transfer target layer 4 is adversely affected by the irradiation light 7 irradiation.
- the irradiation direction of the irradiation light 7 is not limited to the above, and the irradiation light may be irradiated from the side opposite to the substrate 1.
- the separation layer 2 preferably reverses the positional relationship between the light absorption layer 21 and the reflection layer 22 as described above.
- a quartz substrate softening point: 1630 ° (:, strain point: 1070 ° C, transmittance of excimer laser, etc .: almost 100%)
- a separation layer consisting of a two-layered stack of a light absorption layer and a reflection layer was formed on one side of the substrate.
- Amorphous silicon (a-Si) film was formed by low-pressure CVD (Si 2 H 6
- the thickness of the light absorbing layer was 120 nm
- the reflective layer was formed by sputtering a metal thin film of Ta on the light absorbing layer.
- the thickness of the layer was 100 nm, and the reflectivity of laser light described later was 60%.
- the S i 0 2 film as the intermediate layer ECR-CVD method (S iH 4 + 0 2 gas, 100.C) was formed by.
- the thickness of the intermediate layer was 200 nm.
- an amorphous silicon film having a thickness of 6 Onm is formed on the intermediate layer by a low-pressure CVD method (Si 2 H 6 gas, 425.C) as a transferred layer.
- the film was crystallized by irradiation with laser light (wavelength 308 nm) to form a polysilicon film. Thereafter, predetermined patterning, ion implantation, and the like were performed on the polysilicon film to form a thin film transistor.
- an ultraviolet-curing adhesive was applied on the thin film transistor (film thickness: 100 ⁇ m), and the coated film was transferred to a large-sized 20 Omm x 30 Omm x 1.1 mm thick as a transfer body. After bonding a transparent glass substrate (soda glass, softening point: 740.C, strain point: 511 ° C), the glass substrate was irradiated with ultraviolet light to cure the adhesive, and these were bonded and fixed.
- Xe-C1 excimer laser (wavelength: 308 nm) was irradiated from the quartz substrate side to cause peeling (intralayer peeling and interface peeling) on the separation layer.
- the energy density of the irradiated Xe—C 1 excimer laser was 16 Om J / cm 2 , and the irradiation time was 20 ns ec.
- Excimer laser irradiation includes spot beam irradiation and line irradiation. There is beam irradiation.
- spot irradiation is performed on a predetermined unit area (for example, 1 Omm ⁇ 1 Omm), and irradiation is performed while shifting the spot irradiation by about 1/10 of the unit area.
- a predetermined unit area for example, 378 mm x 0.1 mm, 378 mm x 0.3 mm (the area where 90% or more of energy can be obtained)
- This laser irradiation is performed while shifting the irradiation area over the entire surface of the quartz substrate.
- the thin film transistor and the intermediate layer were transferred to the glass substrate side.
- the separation layer attached to the surface of the intermediate layer on the glass substrate side was removed by etching, washing, or a combination thereof.
- the same treatment was applied to the quartz substrate, which was reused.
- the transfer of the thin film transistor was performed in the same manner as in Example 1 except that the light absorption layer was an amorphous silicon film containing 18 at% of H (hydrogen).
- the amount of H in the amorphous silicon film was adjusted by appropriately setting the conditions for film formation by the low-pressure CVD method.
- a thin film transistor was transferred in the same manner as in Example 1 except that the light absorption layer was a ceramic thin film (composition: PbTiO 3 , film thickness: 20 Onm) formed by a sol-gel method by spin coating.
- the light absorption layer was a ceramic thin film (composition: PbTiO 3 , film thickness: 20 Onm) formed by a sol-gel method by spin coating.
- the light absorbing layer is a ceramic thin film (composition: BaTi 3 , film thickness: 400 nm) formed by sputtering
- the reflective layer is a gold thin film of A1 (film thickness: 12 Onm, laser light) formed by sputtering.
- A1 film thickness: 12 Onm, laser light
- Ceramic thin film with light absorption layer formed by laser ablation method composition: Pb (Z r, T i) 0 3 (PZT), thickness: 50 nm
- the metal thin film reflective layer by F e- C r alloy formed by sputtering using an alloy evening Getto
- the transfer of the thin film transistor was performed in the same manner as in Example 1 except that the light absorption layer was a polyimide film (thickness: 20 Onm) formed by spin coating.
- the transfer of the thin film transistor was performed in the same manner as in Example 1 except that the light absorption layer was a Pr layer (rare earth metal layer) (thickness: 500 nm) formed by sputtering.
- the light absorption layer was a Pr layer (rare earth metal layer) (thickness: 500 nm) formed by sputtering.
- the transfer of the thin film transistor was performed in the same manner as in Example 2 except that Kr-F excimer laser (wavelength: 248 nm) was used as the irradiation light.
- the energy density of the irradiated laser was 18 OmJ / cm 2 , and the irradiation time was 20 ns ec. (Example 9)
- the transfer of the thin film transistor was performed in the same manner as in Example 2 except that an Ar laser (wavelength: 1024 nm) was used as the irradiation light.
- the energy density of the irradiated laser was 25 Om J / cm 2 , and the irradiation time was 50 nsec.
- the transfer of the thin film transistor was performed in the same manner as in Example 1 except that the transfer target layer was a polysilicon film (thickness: 9 Onm) thin film transistor formed by a high-temperature process (1000 ° C.).
- the transfer of the thin film transistor was performed in the same manner as in Example 2 except that the transferred layer was a thin film transistor of a polysilicon film (thickness: 80 nm) formed by a high-temperature process (1030 ° C).
- Example 12 The transfer of the film transistor was performed in the same manner as in Example 4 except that the layer to be transferred was a polysilicon film (thickness: 8 O nm) formed by a high-temperature process (130 ° C.). .
- the separation layer has a light-shielding layer, particularly a reflective layer, It is possible to prevent the transfer layer and the like from being adversely affected, as in the case of a thin film transistor, and to use the light reflected by the reflection layer, so that the separation layer can be peeled more efficiently.
- the object to be peeled or the layer to be transferred in the first embodiment is a thin film device.
- FIGS. 17 to 22 are cross-sectional views showing steps of an embodiment of the peeling method of the present invention.
- the steps of the peeling method (transfer method) of the present invention will be sequentially described based on these drawings. Since there are many items common to the first embodiment, the same reference numerals are given to the common components, but detailed description is omitted as appropriate. However, a description will be added for parts different from the first embodiment.
- Step 1 As shown in FIG. 17, a separation layer (light absorbing layer) 120 is formed on a substrate 100.
- the substrate 100 and the separation layer 120 will be described.
- the substrate 100 preferably has a light-transmitting property through which light can pass. This In this case, the light transmittance is the same as in the first embodiment. Further, the material and thickness of the substrate 100 are the same as in the first embodiment.
- the separation layer 120 has a property of absorbing the irradiated light and causing separation (hereinafter referred to as “intralayer separation” or “interfacial separation”) in the layer and / or at the interface. Yes, preferably, the irradiation of light reduces or decreases the bonding force between the atoms or molecules of the substance constituting the separation layer 120, that is, abrasion occurs to cause intra-layer peeling and / or interfacial peeling. Everything is good.
- gas may be released from the separation layer 120 by light irradiation, and a separation effect may be exhibited. That is, there is a case where the component contained in the separation layer 120 is released as a gas, and a case where the separation layer 120 absorbs light and turns into a gas for a moment, and the vapor is released to contribute to separation. .
- the composition of such a separation layer 120 is the same as that of the first embodiment.
- the thickness of the separation layer 120 and the method of forming the same are the same as those in the first embodiment.
- a layer to be transferred (book film device layer) 140 is formed on the separation layer 120.
- An enlarged cross-sectional view of the K portion of the thin film device layer 140 (the portion surrounded by a dashed line in FIG. 18) is shown on the right side of FIG.
- the thin-film device layer 140 includes, for example, a TFT (thin film transistor) formed on a SiO 2 film (intermediate layer) 142.
- the TFT includes an n-type impurity added to a polysilicon layer.
- the SiO 2 film is used as the intermediate layer provided in contact with the separation layer 120, but another insulating film such as Si 3 N 4 may be used.
- the thickness of the S I_ ⁇ 2 film (intermediate layer) is being applied Yichun determined according to the degree of its formation purpose and exhibit and can function normally is preferably in the range of about 10nm ⁇ 5 m, 40 nm ⁇ It is more preferably about l zm.
- the intermediate layer is formed for various purposes, for example, for example, at least one of a protective layer that physically or chemically protects the transferred layer 140, an insulating layer, a conductive layer, a laser light shielding layer, a barrier layer for preventing migration, and a function as a reflective layer. That exert the following.
- the transfer layer (thin film device layer) 140 may be formed directly on the separation layer 120 without forming the intermediate layer such as the SiO 2 film.
- the layer to be transferred 140 is a layer including a thin film device such as TFT as shown on the right side of FIG.
- a thin film device such as TFT as shown on the right side of FIG.
- TFT thin film device
- Such a thin film device (thin film element) is usually formed at a relatively high process temperature in relation to the method of forming the thin film device. Therefore, in this case, as described above, the substrate 100 needs to have a high reliability that can withstand the process temperature.
- the thin film device layer 140 is bonded (adhered) to the transfer body 180 via the adhesive layer 16 °.
- the adhesive layer 16 ° As a preferred example of the adhesive constituting the adhesive layer 160, the same adhesive as in the first embodiment is used.
- a curable adhesive is used, for example, a curable adhesive is applied on the layer to be transferred (thin film device layer) 140, and a transfer member 180 is bonded thereon.
- the curable adhesive is cured by a curing method according to the above, and the layer to be transferred (thin film device layer) 140 and the transfer body 180 are adhered and fixed.
- the adhesive is of a light-curing type, light is emitted from one side of the light-transmitting substrate 100 or the light-transmitting transfer member 180 (or from both outsides of the light-transmitting substrate and the transfer member). Is irradiated.
- a photo-curing adhesive such as an ultraviolet-curing type, which does not easily affect the thin film device layer, is preferable.
- an adhesive layer 160 is formed on the transfer member 180 side, and A transfer layer (thin film device layer) 140 may be bonded to the substrate.
- a transfer layer (thin film device layer) 140 may be bonded to the substrate.
- the transfer body 180 has a self-adhesive function, the formation of the adhesive layer 160 may be omitted.
- the transfer body 180 the same one as exemplified in the first embodiment can be used.
- Step 4 Next, as shown in FIG. 20, light is irradiated from the back side of the substrate 100. This light is applied to the separation layer 120 after passing through the substrate 100. This As a result, delamination and / or interfacial delamination occurs in the separation layer 120, and the bonding force decreases or disappears.
- the principle that separation within the separation layer 120 and / or interfacial separation occurs is that abrasion occurs in the constituent material of the separation layer 120, release of gas contained in the separation layer 120, Furthermore, it is presumed that this is due to phase changes such as melting and transpiration that occur immediately after irradiation.
- the ablation refers to a phenomenon similar to that described in the first embodiment.
- the irradiation light the same light as that used in the first embodiment can be used.
- excimer laser is particularly preferable. Since the excimer laser outputs high energy in a short wavelength region, it is possible to cause abrasion in the separation layer 2 in a very short time, thereby increasing the temperature of the adjacent transfer member 180, the substrate 100, and the like.
- the separation layer 120 can be peeled off with almost no occurrence, that is, without causing deterioration or damage.
- the wavelength of the laser light to be irradiated is preferably about 100 nm to 350 nm.
- FIG. 23 shows an example of the transmittance of the substrate 100 with respect to the wavelength of light.
- the transmittance sharply increases with respect to a wavelength of 300 nm.
- light having a wavelength of 300 nm or more for example, one light of Xe—C1 excimer laser having a wavelength of 308 nm
- the wavelength of the laser light to be irradiated is about 350 to 1200 nm. Preferably it is.
- the energy density of the emitted laser light is the same as in the first embodiment.
- the separation layer As a countermeasure for the case where the irradiation light transmitted through the separation layer 120 reaches the transfer receiving layer 140 and exerts an adverse effect, for example, as shown in FIG. 38, the separation layer (laser absorption layer) There is a method of forming a metal film 124 such as tantalum (T a) on 120. Thereby, the laser light transmitted through the separation layer 120 is completely reflected at the interface of the metal film 124, and does not adversely affect the film element above it. Typified by laser light It is preferable that the irradiation light is irradiated so that its intensity becomes uniform.
- the irradiation direction of the irradiation light is not limited to the direction perpendicular to the separation layer 120, but may be a direction inclined at a predetermined angle with respect to the separation layer 120.
- the entire region of the separation layer 120 can be irradiated with the irradiation light in plural times. The same location may be irradiated more than once.
- irradiation light laser light
- wavelength ranges wavelengths
- a force is applied to the substrate 100 to separate the substrate 100 from the separation layer 120.
- a separation layer may adhere to the substrate 100 in some cases.
- the remaining separation layer 120 is removed by, for example, a method such as cleaning, etching, etching, polishing or a combination thereof.
- the transfer target layer (thin film device layer) 140 has been transferred to the transfer body 180.
- the substrate 100 is made of an expensive or rare material such as quartz glass, the substrate 100 is preferably used for recycling. That is, the present invention can be applied to the substrate 100 to be reused, and is highly useful.
- the transfer of the transfer target layer (thin film device layer) 140 to the transfer body 180 is completed. Thereafter, removal or S i 0 2 film adjacent to the transfer layer (book film device layer) 1 4 0, the shape formed like conductive layer and a desired protective film such as wiring to the transfer layer 1 4 0 above You can do it too.
- the transferred layer (thin film device layer) 140 which is the object to be peeled is not directly peeled off, but rather in the separation layer bonded to the transferred layer (thin film device layer) 140. Because of the peeling, the peeling (transfer) can be performed easily and surely and uniformly regardless of the characteristics, conditions, etc. of the material to be peeled (transferred layer 140). No damage to the transfer layer 140) and high reliability of the transfer layer 140 Can be maintained.
- This embodiment is a modification of a part of the third embodiment.
- the composition of the separation layer 120 is amorphous silicon (a-Si), vapor phase growth (CVD), especially low pressure (LP) CVD, plasma CVD, atmospheric pressure (AP) Better than CVD and ECR.
- a-Si amorphous silicon
- CVD vapor phase growth
- LP low pressure
- AP atmospheric pressure
- the amorphous silicon layer formed by plasma CVD contains a relatively large amount of hydrogen.
- the presence of hydrogen makes it easier to form an amorphous silicon layer, but when the substrate temperature during film formation exceeds, for example, 350 ° C., hydrogen is released from the amorphous silicon layer. Hydrogen released during the process of forming the thin film device may cause film peeling.
- the plasma CVD film has relatively weak adhesion, and the substrate 100 and the transfer layer 140 may be separated from each other in a wet cleaning step in a device manufacturing process.
- the LPC VD film is excellent in that there is no possibility of releasing hydrogen and that sufficient adhesion can be ensured.
- the thickness of the amorphous silicon layer 120 as a separation layer will be described with reference to FIG. 39, the abscissa indicates the thickness of the amorphous silicon layer, and the ordinate indicates the light energy absorbed by the layer. As described above, irradiation of the amorphous silicon layer with light causes an abrasion.
- the abrasion means that the fixed material (the constituent material of the separation layer 120) that has absorbed the irradiation light is excited photochemically or thermally, and bonds or cuts the atoms or molecules on its surface or inside. It mainly appears as a phenomenon in which all or a part of the constituent material of the separation layer 120 undergoes a phase change such as melting and evaporation (vaporization). In addition, the phase change described above may result in a small firing state, and the bonding strength may be reduced.
- the thickness of the amorphous silicon layer 120 as the separation layer is reduced.
- the energy of light radiated to the amorphous silicon layer 120 can be reduced, and energy saving and downsizing of the light source device can be achieved.
- the fl-thick numerical value of the amorphous silicon layer 120 as a separation layer.
- the absorbed energy required to reach the abrasion needs to be lower as the thickness of the amorphous silicon becomes thinner. Ablation was sufficiently generated by the power of a general light source device.
- the lower limit of the film thickness is not particularly limited, but when the lower limit is preferably set to 5 nm, it is determined from the viewpoint that the amorphous silicon layer can be surely formed and a predetermined adhesive force can be secured. Therefore, a preferable range of the thickness of the amorphous silicon layer 120 as the separation layer is 5 to 25 nm.
- a more preferable thickness is 15 nm or less, which can further save energy and secure adhesion.
- Most suitable! The enormous range is less than or equal to l l nm, and it is around this, so that the absorption energy required for abrasion can be significantly reduced.
- This embodiment is a modification of some steps of the third or fourth embodiment.
- the mechanical properties of the transfer body 180 are preferably those having a certain degree of rigidity (strength), but may be those having flexibility and elasticity. Regarding the mechanical properties of the transfer body 180, the following points should be particularly considered.
- a substance constituting the separation layer 120 is excited optically or thermally, and the bonding of molecules or atoms on the surface or inside thereof is cut off, and the molecules are removed. Or atoms are released to the outside.
- the mechanical strength of the transfer body 180 secures its strength so that the stress acting on the upper layer of the separation layer 120 due to the release of molecules or atoms can be received by the transfer body 180. Is preferred. As a result, the upper layer of the separation layer 120 is deformed or broken. This is because breakage is prevented.
- Such a resistance is not limited only to the mechanical strength of the transfer body 180, but may be a layer located above the separation layer 120, that is, the layer to be transferred 140, the adhesive layer 1. What is necessary is just to ensure by the mechanical strength of any one or several layers of 60 and the transfer body 180. In order to ensure such resistance, the material and thickness of the layer to be transferred 140, the adhesive layer 160 and the transfer body 180 can be appropriately selected.
- the reinforcing layer 132 may be formed at any position above the layer 120.
- the reinforcing layer 132 shown in FIG. 42 (A) is provided between the separation layer 120 and the layer to be transferred 140. This causes separation in the separation layer 120, and then, after the substrate 100 is separated, the reinforcing layer 13 2 together with the remaining separation layer 120 is removed from the layer to be transferred 140. You can also. As shown in FIG. 42 (B), the reinforcing layer 132 provided on the transfer member 180 also has the transfer member 180 at least after the separation layer 120 has peeled off. More can be removed.
- the reinforcing layer 132 shown in FIG. 42 (C) is interposed, for example, as an insulating layer in a plurality of layers constituting the transferred layer 140. Each of the reinforcing layers 132 in FIGS. 42 (D) and (E) is disposed below or above the adhesive layer 140. In these cases, it cannot be removed later.
- This embodiment is a modification of some of the steps of the third, fourth or fifth embodiment.
- FIG. 40 shows an example in which an amorphous silicon layer 120 is used as a separation layer.
- An amorphous silicon layer 126 used as a silicon-based light absorption layer is further provided below the transfer layer 140.
- silicon Silicon oxide film S i 0 2
- the transmitted light is absorbed by the amorphous silicon layer 126 as the silicon-based light absorbing layer.
- the two added layers 126 and 128 are both silicon-based layers, they do not cause metal contamination or the like as is established by conventional thin film forming technology.
- the amorphous silicon layer 126 as the light absorbing layer is made thicker than the S thickness of the amorphous silicon layer 120 as the separation layer, the amorphous silicon layer The possibility of one shot can be reliably prevented.
- the light energy incident on the amorphous silicon layer 126 is sufficiently smaller than the light energy directly incident on the amorphous silicon layer 120 serving as the separation layer. Therefore, the occurrence of abrasion in the amorphous silicon layer 126 can be prevented.
- FIG. 41 an example is shown in which a silicon-based light absorbing layer 130 made of a material different from that of the separation layer 120 is provided.
- the silicon-based intervening layer 128 is not necessarily provided No need.
- This embodiment is a modification of some of the steps of the third, fourth, fifth or sixth embodiment.
- FIGS. 43 and 44 show that the line beam 10 is sequentially scanned in the scanning direction A. Then, a method of irradiating almost the entire surface of the separation layer 120 with light is shown.
- N the number of beam scans of the line beam 10
- N + 1st line beam 10 the irradiation area 20 (N) of the Nth line beam 10 and the irradiation of the N + 1st line beam 10
- Each beam scan is performed so as not to overlap with the region 20 (N + 1). Therefore, a low irradiation area or a non-irradiation area 30 that is sufficiently smaller than each irradiation area is formed between the adjacent irradiation areas 20 (N) and 20 (N + 1).
- the region denoted by reference numeral 30 is a low irradiation region.
- the region denoted by reference numeral 30 becomes a non-irradiation region.
- FIG. 44 differs from FIG. 43 in that the irradiation area 20 of the N-th line beam 10
- Each beam scan is performed so that (N) and the irradiation area 20 (N + 1) of the (N + 1) th line beam 10 overlap. Therefore, a two-time irradiation area 40 is formed between the adjacent irradiation areas 20 (N) and 20 (N + 1).
- FIGS. 46 and 47 show the position-dependent light intensity distribution of two adjacent line beams 10 and 10 by beam scanning.
- each line beam 10 has a flat beam 10a in which the light intensity is maximized in a region of a predetermined width including the beam center. Then, two line beams 10 and 10 adjacent by the beam scan are beam-scanned such that their flat beaks 10a do not overlap with each other.
- each line beam 10 has a maximum light intensity at the beam center, and the light intensity decreases as the distance from the beam center increases.
- the two line beams 10 and 10 adjacent to each other by the beam scan are set so that the effective beam irradiation areas that are 90% or more of the maximum light intensity of each line beam 10 do not overlap each other. Be scanned.
- the total beam irradiation amount (sum of light intensity X time at each position) of the twice irradiation region 40 is 2 in the flat beak region or the beam irradiation effective region where the maximum light intensity is 90% or more. This is less than when the same area is set successively.
- the separation layer in that area may be peeled off for the first time by the two beam irradiations. In this case, the above-described excessive beam irradiation does not occur.
- the light incident on the chair can be reduced due to the second beam irradiation. The electrical characteristics of the chair were prevented from deteriorating, or reduced to such an extent that no practical problems would occur.
- the maximum value of the light intensity irradiated each time in the twice-irradiated area 40 is the maximum light intensity of each light irradiation (light intensity at the beam center). Is preferably 90% or less, more preferably 80% or less, and still more preferably 50% or less. In particular, if the absolute value of the beam intensity is large and the separation can be performed even at the half width (50%) of the light intensity of the beam, the overlap exceeding the half width (50%) of the light intensity of the beam should be eliminated. It does not matter. Note that the above is not limited to the line beam 10, but the same applies to beams of other shapes such as the spot beam 10. In the case of a spot beam, it is necessary to consider the relationship with other beam irradiation areas adjacent vertically and horizontally.
- the irradiation direction of the irradiation light is not limited to the direction perpendicular to the separation layer 120 as long as the irradiation light typified by the laser light is irradiated so that the intensity is almost uniform. May be a direction inclined at a predetermined angle with respect to.
- Example 1 of the third embodiment is implemented by laser irradiation in Example 1 of the third embodiment.
- a quartz substrate with a length of 50 mm and a width of 5 Ommx and a thickness of 1.1 mm (softening point: 1630 ° C, strain point: 1070 ° C, transmittance of excimer laser: almost 100%) is prepared.
- An amorphous silicon (a-Si) film was formed as a separation layer (laser light absorbing layer) on one side of the substrate by low-pressure CVD (Si 2 H 6 gas, 425 ° C). The thickness of the separation layer was 100 nm.
- an E CR- C VD method as an intermediate layer (S iH 4 + 0 2 gas, 100 ° C) was formed by.
- the thickness of the intermediate layer was 200 nm.
- a polycrystalline (poly) silicon film with a thickness of 5 Onm was formed on the intermediate layer by CVD (Si 2 H 6 gas) as a layer to be transferred. After that, predetermined patterning was performed on the polysilicon film to form a region serving as a source / drain channel of the thin film transistor.
- a gate insulating film S i0 2 1000 ° after C or more polysilicon con film surface by high temperature is thermally oxidized to form a gate insulating film S i0 2, ⁇ point metal is stacked such as Mo to the gate electrode (polysilicon on the gate insulating film).
- the source and drain regions were formed in a self-aligned manner (self-aligned) by ion implantation using the gate electrode as a mask to form a thin film transistor. Note that a thin film transistor having similar characteristics can be formed by using a low-temperature process instead of the high-temperature process as described above.
- amorphous silicon film with a thickness of 5 Si 2 H 6 gas, 425.C
- laser light wavelength 308 nm
- predetermined patterning was performed on the polysilicon film to form a region serving as a source / drain channel of the thin film transistor.
- a gate insulating film S i0 2 on the polysilicon film by low-pressure CVD (refractory metal is laminated structure such as Mo on polysilicon) gate electrode on the gate insulating film shape formed of
- the source and drain regions were formed in a self-aligned (self-aligned) manner by ion implantation using the gate electrode as a mask, and a thin film transistor was formed. Thereafter, if necessary, an electrode and a wiring connected to the source and drain regions, and a wiring connected to the gate electrode are formed.
- A1 is used for these electrodes and wires. The force is not limited to this. If there is a concern that A 1 may be melted by the laser irradiation in the subsequent step, a metal having a higher melting point than A 1 (a metal that does not melt by the laser irradiation in the subsequent step) may be used.
- an ultraviolet curable adhesive was applied on the thin film transistor (film thickness: 100 m), and a large transparent 20 mm O.times.30 mm.times.1.1 mm thick as a transfer body was applied to the coating film.
- a glass substrate sina glass, softening point: 740.C, strain point: 511 ° C
- the glass substrate was irradiated with ultraviolet light to cure the adhesive, and these were bonded and fixed.
- Xe-C1 excimer laser (wavelength: 308 nm) is irradiated from the quartz substrate side, and the beam scan shown in Fig. 43 and subsequent figures is performed to separate the separation layer (intralayer separation and interface separation). Spawned.
- the energy density of the irradiated Xe—C 1 excimer laser was 25 OmJ / cm 2 , and the irradiation time was 20 nsec.
- the irradiation of the excimer laser includes a spot beam irradiation and a line beam irradiation. In the case of a spot beam irradiation, a spot irradiation is performed on a predetermined unit area (for example, 8 mm ⁇ 8 mm).
- irradiation is performed while beam scanning is performed so that the irradiation areas of each time do not overlap (do not overlap in front, rear, left and right).
- a predetermined unit area for example, 378 mm x 0.1 mm or 378 mm x 0.3 mm (these are areas where more than 90% of energy can be obtained)
- irradiation is performed while performing beam scanning so that the irradiation regions do not overlap each other.
- beam scanning may be performed so that the beam intensity in the region to be overlapped is reduced.
- the quartz substrate and the glass substrate (transfer body) were peeled off at the separation layer, and the thin film transistor and the intermediate layer formed on the quartz substrate were transferred to the glass substrate side. Thereafter, the separation layer adhered to the surface of the intermediate layer on the glass substrate side was removed by etching, washing, or a combination thereof. The same treatment was applied to the quartz substrate, which was reused.
- the transfer from the quartz substrate to the glass substrate as in this embodiment is repeatedly performed on different areas in a plane, and the transfer is performed on the glass substrate. More thin film transistors than the number of thin film transistors that can be formed over the quartz substrate can be formed. Furthermore, by repeatedly laminating on a glass substrate, more thin film transistors can be similarly formed.
- the object to be peeled or the layer to be transferred in any one of the first to seventh embodiments is a TFT having a CMOS structure.
- 24 to 34 are cross-sectional views showing steps of an embodiment of the peeling method of the present invention.
- a separation layer for example, an amorphous silicon layer formed by the LPC VD method 120 and an intermediate layer (for example, and S i 0 2 film) 1 4 2 is formed by an amorphous silicon layer (e.g., an LPCVD method) sequentially laminated a 1 4 3, followed by the above on the entire surface of Amorufa scan the silicon layer 1 4 3 Irradiate with laser light and anneal.
- an amorphous silicon layer 144 is recrystallized into a polysilicon layer ⁇
- Step 2 Subsequently, as shown in FIG. 25, the polysilicon layer obtained by laser annealing is patterned to form islands 144a and 144b, [Step 3] As shown in FIG. 26, gate insulating films 148a and 148b covering the islands 144a and 144b are formed by, for example, a CVD method.
- gate electrodes 150a and 15 Ob made of polysilicon or metal are formed.
- Step 5 As shown in FIG. 28, a mask layer 170 made of polyimide or the like is formed, and the gate electrode 15 Ob and the mask layer 170 are used as masks. Do. Thus, p + layers 172a and 172b are formed.
- Step 6 As shown in FIG. 29, a mask layer 174 made of polyimide or the like is formed, and the gate electrode 150a and the mask layer 174 are used as a mask, and phosphorus (P) ion implantation is performed in a self-aligned manner. Do. Thus, n + layers 146a and 146b are formed.
- Step 7 As shown in FIG. 30, an interlayer insulating film 154 is formed, and after selectively forming contact holes, electrodes 152a to 152d are formed.
- the TFT having the CMOS structure formed in this way corresponds to the layer to be transferred (thin film device layer) 140 in FIGS. 18 to 22.
- a protective film may be formed over the interlayer insulating film 154.
- an epoxy resin layer 160 is formed as an adhesive layer on the CMOS-structured TFT, and then the TFT is transferred to the transfer body (for example, through the epoxy resin layer 160). (Soda glass substrate) 180. Subsequently, the epoxy resin is cured by applying heat, and the transfer body 180 and the TFT are bonded (joined).
- the adhesive layer 160 may be a photopolymer resin which is an ultraviolet curable adhesive. In this case, the polymer is cured by irradiating not the heat but the ultraviolet from the transfer body 180 side.
- Step 9 As shown in FIG. 32, the back surface of the substrate 100 is irradiated with, for example, one Xe—C 1 excimer laser beam. This causes separation within the layer of the separation layer 120 and / or at the interface.
- Step 10 As shown in FIG. 33, the substrate 100 is peeled off.
- Step 11 Finally, the separation layer 120 is removed by etching.
- Rei_1 ⁇ 0 3 Ding 1 1 configuration becomes the and this transferred to the transfer member 1 8 0.
- FIG. 35 (a) When the thin-film device transfer technology described in any of the first to eighth embodiments is used, for example, a micro-combination using a thin film element as shown in FIG. 35 (a) can be used.
- the user can be formed on a desired substrate.
- a solar cell 340 having a PIN junction of amorphous silicon for supplying a power supply voltage of these circuits is mounted.
- the microcombination in Fig. 35 (a) is formed on a flexible substrate, so it is resistant to bending as shown in Fig. 35 (b), and it is also resistant to falling due to its light weight. There are features.
- a display device can be created.
- the active matrix type liquid crystal display device includes an illumination light source 400 such as a backlight, a polarizing plate 420, an active matrix substrate 450, a liquid crystal 450, and a counter substrate. 480, polarizing plate 500 is provided.
- a reflective liquid crystal panel employing a reflector instead of the illumination light source 400 may be used.
- An active matrix liquid crystal panel which is flexible, resistant to impact, and lightweight can be realized.
- the pixel electrode is formed of a metal, the reflection plate and the polarizing plate 420 become unnecessary.
- the active matrix substrate 440 used in this embodiment has a pixel portion 442.
- This is an active matrix substrate with a built-in driver on which TFTs are arranged and on which driver circuits (scanning line drivers and data line drivers) 444 are mounted.
- FIG. 37 shows a circuit configuration of a main part of the active matrix liquid crystal display device. As shown in FIG. 37, in the pixel portion 442, the gate is connected to the gate line G1, one of the source and drain is connected to the data line D1, and the other of the source and drain is connected to the liquid crystal 460. TFT (Ml) and liquid crystal. Further, the driver part 444 includes a TFT (M2) formed by the same process as the TFT (Ml) of the pixel portion.
- the active matrix substrate 440 including TFT (M1) and TFT (M2) can be formed by the transfer method described in the third and fourth embodiments.
- the present invention provides a manufacturing substrate by transferring various objects to be peeled (transfer objects) that can be formed on a substrate to a transfer body different from the substrate used for the formation. Since the object to be peeled can be arranged on a transfer member different from the above, the present invention can be applied to the manufacture of not only a liquid crystal display device and a semiconductor integrated circuit but also various devices.
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Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2004-7015277A KR100500520B1 (ko) | 1996-08-27 | 1997-08-26 | 전사 방법 및 액티브 매트릭스 기판 제조 방법 |
US09/051,966 US6372608B1 (en) | 1996-08-27 | 1997-08-26 | Separating method, method for transferring thin film device, thin film device, thin film integrated circuit device, and liquid crystal display device manufactured by using the transferring method |
KR10-1998-0703007A KR100481994B1 (ko) | 1996-08-27 | 1997-08-26 | 박리방법,박막디바이스의전사방법,및그것을이용하여제조되는박막디바이스,박막집적회로장치및액정표시장치 |
EP97935891A EP0858110B1 (en) | 1996-08-27 | 1997-08-26 | Separating method, method for transferring thin film device, and liquid crystal display device manufactured by using the transferring method |
DE69737086T DE69737086T2 (de) | 1996-08-27 | 1997-08-26 | Trennverfahren, verfahren zur übertragung eines dünnfilmbauelements, und unter verwendung des übertragungsverfahrens hergestelltes flüssigkristall-anzeigebauelement |
US10/091,562 US6645830B2 (en) | 1996-08-27 | 2002-03-07 | Exfoliating method, transferring method of thin film device, and thin film device, thin film integrated circuit device and liquid crystal display device produced by the same |
US10/851,202 US7094665B2 (en) | 1996-08-27 | 2004-05-24 | Exfoliating method, transferring method of thin film device, and thin film device, thin film integrated circuit device, and liquid crystal display device produced by the same |
US11/242,017 US7285476B2 (en) | 1996-08-27 | 2005-10-04 | Exfoliating method, transferring method of thin film device, and thin film device, thin film integrated circuit device, and liquid crystal display device produced by the same |
US11/514,985 US7468308B2 (en) | 1996-08-27 | 2006-09-05 | Exfoliating method, transferring method of thin film device, and thin film device, thin film integrated circuit device, and liquid crystal display device produced by the same |
Applications Claiming Priority (12)
Application Number | Priority Date | Filing Date | Title |
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JP22564396 | 1996-08-27 | ||
JP8/225643 | 1996-08-27 | ||
JP8/300371 | 1996-11-12 | ||
JP8/315590 | 1996-11-12 | ||
JP8/300373 | 1996-11-12 | ||
JP30037396A JP4619461B2 (ja) | 1996-08-27 | 1996-11-12 | 薄膜デバイスの転写方法、及びデバイスの製造方法 |
JP31559096A JP4619462B2 (ja) | 1996-08-27 | 1996-11-12 | 薄膜素子の転写方法 |
JP30037196A JP3809681B2 (ja) | 1996-08-27 | 1996-11-12 | 剥離方法 |
JP19308197A JP3809710B2 (ja) | 1997-07-03 | 1997-07-03 | 薄膜素子の転写方法 |
JP19308297 | 1997-07-03 | ||
JP9/193082 | 1997-07-03 | ||
JP9/193081 | 1997-07-03 |
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US09/051,966 A-371-Of-International US6372608B1 (en) | 1996-08-27 | 1997-08-26 | Separating method, method for transferring thin film device, thin film device, thin film integrated circuit device, and liquid crystal display device manufactured by using the transferring method |
US09/051,966 Continuation US6372608B1 (en) | 1996-08-27 | 1997-08-26 | Separating method, method for transferring thin film device, thin film device, thin film integrated circuit device, and liquid crystal display device manufactured by using the transferring method |
US10/091,562 Continuation US6645830B2 (en) | 1996-08-27 | 2002-03-07 | Exfoliating method, transferring method of thin film device, and thin film device, thin film integrated circuit device and liquid crystal display device produced by the same |
US10/091,562 Division US6645830B2 (en) | 1996-08-27 | 2002-03-07 | Exfoliating method, transferring method of thin film device, and thin film device, thin film integrated circuit device and liquid crystal display device produced by the same |
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US (6) | US6372608B1 (ja) |
EP (5) | EP1758169A3 (ja) |
KR (2) | KR100500520B1 (ja) |
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- 1997-08-26 DE DE69739376T patent/DE69739376D1/de not_active Expired - Lifetime
- 1997-08-26 EP EP97935891A patent/EP0858110B1/en not_active Expired - Lifetime
- 1997-08-26 CN CNB971911347A patent/CN1143394C/zh not_active Expired - Lifetime
- 1997-08-26 EP EP06076859A patent/EP1744365B1/en not_active Expired - Lifetime
- 1997-08-26 EP EP03076869A patent/EP1351308B1/en not_active Expired - Lifetime
- 1997-08-26 DE DE69737086T patent/DE69737086T2/de not_active Expired - Lifetime
- 1997-08-26 CN CNA031579647A patent/CN1495523A/zh active Pending
- 1997-08-26 DE DE69739368T patent/DE69739368D1/de not_active Expired - Lifetime
- 1997-08-26 US US09/051,966 patent/US6372608B1/en not_active Expired - Lifetime
- 1997-08-26 KR KR10-1998-0703007A patent/KR100481994B1/ko not_active IP Right Cessation
- 1997-08-26 EP EP06075225A patent/EP1655633A3/en not_active Ceased
- 1997-08-26 WO PCT/JP1997/002972 patent/WO1998009333A1/ja active IP Right Grant
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2002
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