WO2008023824A1 - Dispositif à semi-conducteur et son procédé de fabrication - Google Patents
Dispositif à semi-conducteur et son procédé de fabrication Download PDFInfo
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- WO2008023824A1 WO2008023824A1 PCT/JP2007/066699 JP2007066699W WO2008023824A1 WO 2008023824 A1 WO2008023824 A1 WO 2008023824A1 JP 2007066699 W JP2007066699 W JP 2007066699W WO 2008023824 A1 WO2008023824 A1 WO 2008023824A1
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- support
- semiconductor substrate
- semiconductor
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- semiconductor device
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Classifications
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- H01L27/144—Devices controlled by radiation
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Definitions
- the present invention relates to a semiconductor device and a manufacturing method thereof, and more particularly to a semiconductor device in which an element formed on a semiconductor substrate is sealed and a manufacturing method thereof.
- These device elements are formed on a semiconductor chip, and the completed semiconductor chip is sealed with a sealing body.
- a sealing structure include a can package that is sealed with a metal cap, a ceramic package that is sealed with a ceramic cap, and a package that is sealed with a cylindrical casing.
- the conventional sealing structure has a problem that the entire size is increased. Also, in the conventional sealing structure, a semiconductor chip on which device elements are formed and a sealing body are separately prepared and assembled. For this reason, there is a problem that the manufacturing process in mass production becomes complicated and the manufacturing cost increases accordingly.
- an object of the present invention is to provide a semiconductor device and a method for manufacturing the semiconductor device that are smaller in size and that can simplify the manufacturing process and reduce the manufacturing cost.
- a semiconductor device is provided with a cavity (C avity) and it is desired to effectively use the cavity.
- a cavity C avity
- another object of the present invention is to provide a semiconductor device having a cavity.
- the semiconductor device of the present invention includes a semiconductor substrate, a first support body that has a through-hole that is bonded to the surface of the semiconductor substrate via an adhesive layer and penetrates from the front surface to the back surface, and the through-hole.
- the semiconductor device of the present invention includes a semiconductor substrate, a support having a through-hole bonded to the surface of the semiconductor substrate via an adhesive layer, and penetrating from the front surface to the back surface, and the semiconductor element includes the through-hole. It is formed on a semiconductor substrate corresponding to the above.
- the method for manufacturing a semiconductor device of the present invention includes a step of attaching a first support on the surface of a semiconductor substrate via an adhesive layer, and selectively removing a part of the first support, A step of forming a through-hole penetrating from the front surface to the back surface of the first support; and a second support via an adhesive layer on the first support so as to cover the through-hole. And a step of sealing a device element in a cavity surrounded by the semiconductor substrate, the first support body, and the second support body.
- the method for manufacturing a semiconductor device of the present invention includes a step of attaching a support to the surface of a semiconductor substrate via an adhesive layer, a part of the support is selectively removed, and the surface of the support is removed. Forming a through-hole penetrating to the back surface, and removing a support on the semiconductor element formed on the semiconductor substrate.
- the first support body having a through hole penetrating from the front surface to the back surface of the semiconductor substrate is bonded to the first support body so as to cover the through hole.
- a second support and integrated as a chip Therefore, it is possible to form a cavity and reduce the size of the entire apparatus.
- the conventional assembling work can be simplified and the manufacturing cost can be reduced.
- FIG. 1 is a cross-sectional view illustrating a semiconductor device according to the first embodiment of the present invention
- FIG. 2 is a cross-sectional view illustrating the semiconductor device according to the first embodiment of the present invention
- Figure FIG. 4 is a cross-sectional view illustrating the semiconductor device according to the first embodiment of the present invention
- FIG. 4 is a cross-sectional view illustrating the semiconductor device according to the first embodiment of the present invention
- FIG. 6 is a cross-sectional view illustrating a semiconductor device according to a first embodiment of the present invention
- FIG. 6 is a cross-sectional view illustrating a semiconductor device according to a second embodiment of the present invention
- FIG. 8 is a sectional view for explaining a semiconductor device according to a second embodiment of the invention
- FIG. 8 is a sectional view for explaining a semiconductor device according to the second embodiment of the present invention
- FIG. FIG. 10 is a cross-sectional view illustrating a semiconductor device according to a second embodiment
- FIG. 10 is a cross-sectional view illustrating a semiconductor device according to a third embodiment of the present invention.
- FIGS. 1 to 5 are cross-sectional views shown in the order of manufacturing steps.
- S light receiving element such as CCD, infrared sensor, CMOS sensor, light emitting element or other semiconductor element
- the device element 1 may be a mechanical device such as a MEMS (MicroElectroMeChananica1Systems) element.
- MEMS MicroElectroMeChananica1Systems
- MEMS is a device in which mechanical component parts, sensors, actuators, electronic circuits, etc. are integrated on a semiconductor substrate.
- an insulating film for example, a silicon oxide film formed by a thermal oxidation method, a CVD method, or the like is formed on the surface of the semiconductor substrate 2.
- a wiring layer 3 (for example, an aluminum layer) is formed on the insulating film, for example, a sputter. It is formed by the tulling method.
- the wiring layer 3 is electrically connected to the device element 1 and a conductive terminal 13 to be described later, and the power supply to the device element 1 is interposed.
- a passivation film (not shown) is formed on the semiconductor substrate 2 including the wiring layer 3.
- the first support 5 is bonded onto the surface of the semiconductor substrate 2 via an adhesive layer 4 such as epoxy resin, polyimide, polyimide (eg, photosensitive polyimide), resist, acrylic, or the like.
- the first support 5 may be a substrate made of, for example, glass, quartz, ceramic, metal or the like, or may be made of a resin (eg, epoxy resin, acrylic resin, polyester resin, etc.).
- the thickness is, for example, 1500 m.
- etching, laser beam irradiation, sandblasting, etc. are performed on a region including at least an element formation region (a region where the device element 1 and the wiring layer 3 are formed) in the first support 5.
- the first support 5 is selectively removed.
- a through-hole 6 that penetrates the first support 5 from the front surface to the back surface is formed.
- the lower adhesive layer 4 is also removed following the selective removal of the first support 5.
- a dry etching method or a wet etching method may be used as a method for removing the adhesive layer 4.
- the etching resistance may be improved.
- the through hole 6 is formed so that the wiring layer 3 is exposed.
- the through hole 6 may be formed in a state where the wiring layer 3 is covered.
- the through-hole 6 has a substantially square shape with, for example, about 100 to 200 / im on one side, although it varies depending on the application when viewed from the upper surface direction.
- the planar shape of the through-hole 6 is not limited to a square shape, but may be other polygons (such as a triangle or a pentagon), or a shape including a curved portion such as a circle.
- Sand blasting is a method of processing an object by injecting fine particles such as alumina and silica onto the object.
- the first support body in which the through holes are formed in advance may be bonded onto the semiconductor substrate 2.
- the second support 7 may be a substrate made of glass, quartz, ceramic, or metal, like the first support 5, or is made of a resin (for example, epoxy resin, acrylic resin, polyester resin, etc.). It may be a thing.
- the thickness is, for example, 1500 m.
- the second support 7 is made of a transparent or translucent material and has a property of transmitting light.
- a predetermined thin film can be formed on the back surface of the second support 7 (the surface facing the semiconductor substrate 1) according to the use of the semiconductor device.
- a layer that transmits only light of a specific wavelength is applied to the second support 7 by a thin film formation technique such as CVD (Chemical Vapor Deposition) or PVD (Physical Vapor Deposition).
- CVD Chemical Vapor Deposition
- PVD Physical Vapor Deposition
- the second support 7 can also have a function as a filter layer (for example, an infrared filter).
- a layer that strongly absorbs light for example, a resin layer to which a black pigment is added
- a metal layer that reflects light for example, an aluminum layer or the like
- a copper layer, etc. may be formed on the back surface of the second support 7 to provide a function as a light shielding layer. it can.
- the second support 7 can have a function as a lens.
- a plano-concave lens (reverse direction) ) Can be used.
- the surface (the surface not facing the semiconductor substrate 1) is processed into a curved shape with respect to the inner side, it can be used as a plano-concave lens (forward direction).
- both surfaces are processed to be curved with respect to the inside, it can be used as a biconcave lens. It can also be used as a plano-convex lens or a biconvex lens by changing the curved shape.
- the second support 5 is formed on the surface of the first support 5 via an adhesive layer 8 such as epoxy resin, polyimide (eg, photosensitive polyimide), resist, acrylic or the like. Laminate support 7 together. Thereby, the through hole 6 is covered with the second support 7, and the inside of the through hole 6 is sealed. An internal space surrounded by the semiconductor substrate 2, the first support 5, and the second support 7 is referred to as a cavity (C avity) 9.
- an adhesive layer 8 such as epoxy resin, polyimide (eg, photosensitive polyimide), resist, acrylic or the like.
- Laminate support 7 together.
- the through hole 6 is covered with the second support 7, and the inside of the through hole 6 is sealed.
- An internal space surrounded by the semiconductor substrate 2, the first support 5, and the second support 7 is referred to as a cavity (C avity) 9.
- first support 5 and the second support 7 are bonded together under a reduced pressure condition so that the inside of the cavity 9 is in a substantially vacuum state.
- the both may be bonded in an atmosphere of an inert gas (for example, nitrogen) and the cavity 9 may be filled with the inert gas. This is because if the cavity 9 is in a vacuum state or filled with an inert gas, corrosion or deterioration due to oxidation or the like of the sealed device element 1 can be prevented.
- the adhesive layer 8 is interposed between the device element and the second support 7,
- the quality of the conductor device may deteriorate.
- the device element is a light-receiving element or light-emitting element
- an extra material that may impede the incidence of light on the device element (or light emission from the device element) may be present between the support and the device element.
- the operation quality of the semiconductor device deteriorates.
- a desired refractive index cannot be obtained.
- the adhesive layer deteriorates, and the deteriorated adhesive layer causes a problem that the operation quality of the semiconductor device is lowered. .
- the adhesive layer 8 is not formed uniformly on the bonding surface of the second support 7, but the through hole 6 (cavity 9) is formed. You may form only in the area
- the device element 10 can also be arranged on the semiconductor substrate 2 in 9.
- the device element 10 is a mechanical device such as a M E M S element.
- fine components such as a filter member and a lens can be arranged in the cavity 9.
- the back surface of the semiconductor substrate 2 is applied to the back surface using a back surface grinding device (grinder).
- the semiconductor substrate 2 is thinned to a predetermined thickness (for example, about 100 / im).
- the grinding process may be an etching process, or a combination of a grinder and an etching process. Depending on the application and specifications of the final product and the initial thickness of the prepared semiconductor substrate 2, the grinding process may not be necessary.
- an insulating film (not shown) and a barrier layer are sequentially formed in the via hole 11 and further electrically connected to the wiring layer 3.
- the formed through electrode 12 (made of copper, aluminum, aluminum alloy, etc.) is formed by a plating method or a sputtering method.
- a protective layer (not shown) having an opening in the formation region of the conductive terminals 13 (for example, composed of a solder resist) is formed.
- a conductive layer 1 3 (for example, solder metal) is electrically connected to the through electrode 12 in the opening of the protective layer (not shown). It consists of layer layers etc.).
- the conductive terminals 13 can be formed by, for example, a screen printing method, a mesh method, or a dispense method.
- the conductive terminal 13 is formed immediately below the through electrode 12.
- the back surface wiring may be formed, and the conductive terminal 13 may be formed on the back surface wiring. That is, as shown in FIG. 5, the back surface of the semiconductor substrate 2 is selectively etched to expose the back surface of the wiring layer 3. Subsequently, an insulating film (not shown) is formed on the side surface and the back surface of the semiconductor substrate 2, and then connected to the back surface of the wiring layer 3, and the back surface wiring 2 is connected to the side surface and the back surface of the semiconductor substrate 2 through the insulating film. Form two. Then, a protective film 2 3 is formed so as to cover the back surface wiring 2 2. The conductive terminal 13 is formed through the opening formed in the protective film 23. The insulating film below the wiring layer 3 and the passivation film on the wiring layer 3 are not shown.
- each semiconductor device 20 or semiconductor device 30 cutting along the dicing line D L completes each semiconductor device 20 or semiconductor device 30.
- a method of dividing into individual semiconductor devices 20 and 30 there are a dicing method, an etching method, a laser cut method and the like.
- the completed semiconductor devices 20 and 30 are mounted on a circuit board or the like on which external electrodes are patterned.
- the semiconductor device of this embodiment includes the first support 5 having the through hole 6 on the surface of the semiconductor substrate 2 on which the device element 1 is formed, and the first support 5 so as to cover the through hole 6. And a second support 7 bonded on the support 5 of 1 and integrated as a chip.
- the device element 1 is sealed in a cavity 9 surrounded by the semiconductor substrate 2, the first support 5, and the second support 7. Therefore, the entire device can be made small.
- the device element is sealed during the manufacturing process of the semiconductor device, and then divided into a plurality of semiconductor devices. Therefore, the assembly work after dicing is simplified, and the manufacturing cost can be suppressed.
- the space of the cavity 9 can be freely expanded or reduced, so that the cavity 9 can be used efficiently.
- a filter member for example, a color filter or a filter that transmits only a specific wavelength
- the structure of the present embodiment is not a structure in which the device element is sealed with one support, but a structure in which the device element is sealed with two supports. Therefore, even if mechanical damage occurs on one support, the propagation of the mechanical damage to the other support is reduced. Therefore, according to this embodiment, the strength of the entire support is improved, and the reliability of the semiconductor device can be improved.
- device elements 1 for example, light receiving elements such as CCDs, infrared sensors, CMOS sensors, and semiconductor elements such as light emitting elements.
- an insulating film for example, a silicon oxide film formed by a thermal oxidation method, a CVD method, or the like is formed on the surface of the semiconductor substrate 2.
- a wiring layer 3 (for example, an aluminum layer) is formed on the insulating film by, for example, a sputtering method.
- the wiring layer 3 is electrically connected to the device element 1 and a conductive terminal 13 to be described later, and interposes power supply to the device element 1.
- a passivation film (not shown) is formed on the semiconductor substrate 2 including the wiring layer 3.
- a support 25 is bonded onto the surface of the semiconductor substrate 2 via an adhesive layer 4 such as epoxy resin, polyimide (eg, photosensitive polyimide), resist, acrylic, or the like.
- the support body 25 may be, for example, a substrate made of glass, quartz, ceramic, metal, or the like. It may be made of fat (eg, epoxy resin, acrylic resin, polyester resin). The thickness is, for example, 150 ⁇ m.
- etching, laser beam irradiation, sand blasting, etc. are performed on the region of the support body 25 including at least the element formation region (the region where the device element 1 and the wiring layer 3 are formed) on the semiconductor element 2.
- the support 2 5 is selectively removed.
- through-holes 26 are formed through the support body 25 from the front surface to the back surface.
- the lower adhesive layer 4 is also removed following the selective removal of the support 25.
- a dry etching method or a wet etching method may be used as a method of removing the adhesive layer 4.
- the support 5 is etched, for example, if a resist film used for forming a plating on the conductive layer on the printed board is used as a mask, the etching resistance may be improved.
- the through hole 26 When viewed from the top surface direction, the through hole 26 is, for example, a substantially square having a side of about 100 to 200 ⁇ m.
- the planar shape of the through hole 26 is not limited to a rectangular shape, but may be other polygonal shapes (triangle, pentagon, etc.) or a shape including a curved portion such as a circle.
- the support body 25 and the adhesion are formed on the light receiving area. Since layer 4 is not formed, loss such as reflection of incident light can be suppressed.
- the refractive index is 1.4.
- the refractive index is the refractive index of air. It becomes 0.
- the through hole 26 is formed on the light receiving area, it can be selected as a support for the support 25.
- the material is not limited to transparent materials, increasing the degree of freedom of selection.
- the semiconductor device 40 or the semiconductor device 50 is formed by forming the conductive terminal 13 connected to the wiring layer 3 as shown in FIGS.
- a semiconductor device 60 having a second support 27 on a support 25 may be configured.
- the through-hole forming process to the second support 27, the adhesive layer 28 removing process, the through-hole forming process to the support 25, and the adhesive layer 4 removing process are manipulated. Return it.
- each support body 5, 7, 2 5, 2 7 is bonded using the adhesive layers 4, 8, 2 8, but the semiconductor substrate 2 and the support bodies 5, 7, 25, It is also possible to omit the adhesive layers 4, 8, 2 8 by bonding them to the surface activation process such as anodic bonding.
- the support 5 is bonded to the semiconductor substrate 2 and then the through hole 6 is formed in the support 5.
- a support having a through hole is prepared, and the support May be bonded to the semiconductor substrate 2.
- a process of removing the passivation film formed on the light receiving / emitting surface is performed. You may have.
- the present invention is not limited to the above-described embodiment, and modifications can be made without departing from the scope of the invention.
- a BGA (Ball Grid Array) type semiconductor device has been described.
- the present invention has a LG A (L and Grid Array) type that does not have a ball-shaped conductive terminal. It can also be applied to other CSP type and flip chip type semiconductor devices.
Description
Claims
Priority Applications (2)
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US12/438,869 US9034729B2 (en) | 2006-08-25 | 2007-08-22 | Semiconductor device and method of manufacturing the same |
JP2008530981A JP5270349B2 (ja) | 2006-08-25 | 2007-08-22 | 半導体装置及びその製造方法 |
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JP2006-229016 | 2006-08-25 | ||
JP2006229016 | 2006-08-25 | ||
JP2007-045491 | 2007-02-26 | ||
JP2007045491 | 2007-02-26 |
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WO2008023824A1 true WO2008023824A1 (fr) | 2008-02-28 |
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US (1) | US9034729B2 (ja) |
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Also Published As
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JPWO2008023824A1 (ja) | 2010-01-14 |
US20090206349A1 (en) | 2009-08-20 |
JP5270349B2 (ja) | 2013-08-21 |
US9034729B2 (en) | 2015-05-19 |
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