WO1996036992A1 - Semiconductor device and its manufacture - Google Patents
Semiconductor device and its manufacture Download PDFInfo
- Publication number
- WO1996036992A1 WO1996036992A1 PCT/JP1996/001263 JP9601263W WO9636992A1 WO 1996036992 A1 WO1996036992 A1 WO 1996036992A1 JP 9601263 W JP9601263 W JP 9601263W WO 9636992 A1 WO9636992 A1 WO 9636992A1
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- substrate
- chip
- semiconductor
- semiconductor device
- wafer
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- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
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Definitions
- the present invention relates to a semiconductor device and a method of manufacturing the same, and particularly to a semiconductor device which is extremely thin, has a low possibility of being damaged by bending force, and is suitable for various cards.
- the present invention relates to a method for manufacturing a semiconductor device capable of forming such a thin semiconductor device stably and at a low cost.
- the conventional LSI assembly technology for thin semiconductor devices is “LSI Handbook” (edited by the Institute of Electronics and Communication Engineers, Ohm Co., Ltd., January 30, 1979). Published on pages 406 to 416), and with these conventional semiconductor device assembly techniques, even if the handling is performed directly, Semiconductor wafers having a thickness of about 200 ⁇ m or more without cracking have been used.
- a polishing method is widely used as a means for thinning a semiconductor wafer.
- the polishing method Therefore, in order to process the semiconductor wafer uniformly, for example, with a processing accuracy of 5% or less, the parallel projection of the semiconductor wafer and the polishing device must be performed with high precision and high reproduction. In order to achieve such extremely high parallel projection, extremely expensive equipment was required, and practical use was difficult.
- a method of polishing while monitoring the thickness of the semiconductor wafer has also been used.However, when a large area is polished by this method, the polishing is performed. The time required can be prolonged significantly, reducing productivity.
- the semiconductor wafer is polished to a very small thickness of, for example, about 0.1 ⁇ , it is formed on the surface of the semiconductor wafer.
- various semiconductor devices such as transistors, could be destroyed due to stress caused by polishing.
- an object of the present invention is to solve the above-mentioned problems of the prior art, to reduce the possibility of being destroyed by bending stress, and to use the present invention in various cards.
- Semiconductor device Is to provide a device.
- Another object of the present invention is to reduce the thickness of the semiconductor chip from about 0.1 to about 110 ⁇ m, and to make such an extremely thin semiconductor chip.
- An object of the present invention is to provide a method for manufacturing a semiconductor device which can be chip-bonded without cracking.
- a semiconductor device comprises a thin semiconductor chip and a substrate which are opposed to each other via an organic adhesive layer containing a number of conductive particles therein.
- the substrate electrodes thus formed are electrically connected to each other via the conductive particles.
- the organic adhesive layer Even if bending stress is applied from the outside, the risk of destruction is extremely small.
- the electrical connection between the semiconductor chip and the substrate is made by the conductive particles contained in the organic adhesive. These conductive particles are deformed by the pressure applied between the electrode and the node respectively provided at the position where the semiconductor chip and the substrate face each other. The deformed conductive particles cause the semiconductor chip and the substrate to be bonded together. Since the electrical connection between the pads is made, the electrical connection between the pad and the electrode is extremely reliably made.
- a nossion film having a predetermined pattern is formed, and the pad is formed of the nossion film. It is installed in the part where no is formed. Since the thickness of the node is smaller than the thickness of the passivation film, the conductive particles existing between the node and the electrode facing each other are transferred to the outside. Is effectively suppressed, so that the pad and the electrode are reliably electrically connected to each other by the conductive particles.
- a method of manufacturing a semiconductor device includes a method of manufacturing a semiconductor wafer affixed on a tape.
- the semiconductor wafer can be uniformly etched by contacting with an etchant while rotating or reciprocating in a lateral direction at a high speed within the surface direction of the semiconductor wafer.
- the thinned semiconductor wafer is diced and divided into a plurality of chips, and each of these thin chips is separated into a plurality of chips. Then, it is heated and pressurized to the substrate to fix it sequentially.
- the semiconductor wafer Since the semiconductor wafer is in contact with the etchant while rotating or reciprocating at a rapid speed in an in-plane direction of the semiconductor wafer, it is extremely small. Etching is performed uniformly, and an extremely thin (0.1 to 110 tm) semiconductor wafer can be obtained without any unevenness or distortion.
- a plurality of such thin semiconductor chips formed by dividing such an extremely thin semiconductor wafer into small chips are sequentially placed on the tape as the first substrate. Since the semiconductor chip is separated and heated and pressed against the second substrate, it is fixed on the second substrate without cracking, even though the semiconductor chip is extremely thin. can do .
- a soft tape as the first substrate, only a desired chip is pushed upward, and only this chip is selectively used. Since heating can be performed, it is extremely easy to fix a desired chip to the second substrate. In order to divide the wafer into chips, it is practically preferable to completely separate the chips into individual chips by dicing.
- the bonding between the second substrate and the semiconductor chip is performed via a conductive adhesive, thereby eliminating the need for wire bonding. This is extremely effective in simplifying the process and reducing costs.
- FIG. 1 is a diagram for explaining a first embodiment of the present invention
- FIG. 2 is a diagram for explaining a conventional method
- FIG. 3 is a plan view for explaining an embodiment of the present invention
- FIG. 4 (1) is a plan view showing the connection between the chip and the board
- FIG. 4 (2) is a plan view showing the connection between the chip and the board
- FIG. 4 (3) is a cross-sectional view showing the connection between the chip and the substrate
- FIGS. 5 (1) to 5 (3) are cross-sectional views showing the connection of the second embodiment of the present invention.
- FIGS. 6 (1) to 6 (5) are process diagrams for explaining a third embodiment of the present invention.
- FIGS. 7 (1) to 7 (6) are process diagrams for explaining a fourth embodiment of the present invention.
- a thin semiconductor wafer 105 is held by a frame 101 (HA-150, manufactured by Hitachi Chemical Co., Ltd.). 6) Place on top of 107.
- the semiconductor wafer 105 is completely cut by the dicing groove 104 and is separated into a plurality of chips 105 ′.
- Each of the separated chips 105 ′ is pushed upward from the back surface of the tape 107 by the heating head 106, and the adhesive 103 is released. It is pressed against the substrate 102 which has been applied in advance, and is adhered by heating to the substrate 102. Since the adhesive 103 is an anisotropic conductive adhesive made of a composite material of an organic substance and conductive particles, the adhesive 103 is not connected to an electrode (not shown) formed on the substrate 102. The electrode (node; not shown) of the thin chip 105 is pressurized and heated via the conductive particles contained in the adhesive 103. They are electrically connected to each other. Note that the tip 105 'has a thickness of about 0.1 to 110 m, which is extremely thin and can be bent.
- the thickness of the chip 105 ′ be in the range of 0.1 to 110 m, since there is a risk of cracking due to bending.
- the tape 107 is soft, the tape 107 is pushed upward while the tape 107 is heated by the heating head 106.
- the thin chip 105 ′ on the tape 107 is also pushed up, and is uniformly and stably bonded to the substrate 102 placed above.
- FIG. 3 is a diagram showing the planar structure of FIG. 1, in which a tape 107 is held by a ring-shaped frame 101 and a die 105 is a die-sine. The grooves are separated from each other by a plurality of chips 105 '.
- the perimeter 304 of the well 105 is inside the frame 101 and is flatly bonded to the tape 107.
- the frame 101 is formed of stainless steel or plastic material.
- the thickness of the blade 105 is extremely thin, from 0.1 to 110 m, but it is strongly adhered to the tape 107 with an adhesive, regardless of the strength. Therefore, even if dicing is performed with the wafer 105 adhered to the tape 107, the thin chip 105 'will be It is not possible to peel apart FIG.
- FIG. 4 shows a state after the thin chip 105 ′ is fixed to the substrate 102.
- Fig. 4 (1) is a plan view
- Fig. 4 (2) is a cross-sectional view.
- a thin chip 105 is fixed to a predetermined position of the substrate 102.
- the electrode (pad) formed on the thin chip 105 'and the electrode (substrate electrode) formed on the substrate 102 are connected in a face-bonding manner. Therefore, they are connected to each other. However, they may be connected to each other by wire bonding or conductive paste.
- FIG. 4 (3) is a schematic enlarged view of the connection between the thin chip 105 'and the substrate 102 shown in FIGS. 4 (1) and (2). It is a sectional view.
- a pad made of a conductive film (an electrode provided on a semiconductor chip) 400 is a thin chip 105.
- 'It is provided on the surface of the substrate from which the passivation film 408 has been removed, and is provided on the surface of the substrate 102 by the conductive particles 406.
- the substrate electrodes 4 12 are connected to each other and are electrically connected to each other.
- An organic film (organic adhesive film) 409 is placed between the substrate 102 and the chip 105 '.
- the organic film 409 is provided with conductive particles 410 in between, and the conductive particles 10 serve as the nodes 4. 0 5 and the substrate electrode 4 1 2 are conducted.
- the thickness of the no-shock-section film 409 is larger than the thickness of the nod 405. Therefore, the movement of the conductive particles 406 interposed between the node 405 and the substrate electrode 412 to the outside is effectively suppressed, and as a result, the pad 4 The connection between the substrate electrode 4 and the substrate electrode 4 1 2 is extremely reliably and electrically connected.
- the tip 202 placed on the tape 203 becomes the vacuum tip 201.
- the substrate is not ringed and moved to another substrate (not shown). That is, the chip 202 placed on the tape 203 is an individual chip formed by the dicing of the wafer, and the protrusions
- the chips 202 pushed up by the lifting pins 204 are sucked by the vacuum chucks 201 and sequentially moved one by one. .
- Tape 203 is coated with a pressure-sensitive adhesive, and the adhesiveness has been reduced by ultraviolet (UV) irradiation or heating, but the adhesiveness remains slightly. Since the push-up pin 204 operates in conjunction with the vacuum chuck 201, the tip 202 is not connected to the tape 203. Can be separated. However, in the conventional method in which the tip is pushed upward by the pushing pin 204, the thickness of the tip 202 is 0.1 to 1 mm. When the thickness is extremely thin, ⁇ , the chip 202 is liable to crack and the productivity is reduced, so that it is difficult to widely use the chip for practical use. .
- UV ultraviolet
- This embodiment is an example of a method for thinning a semiconductor wafer.
- FIG. 5 (1) after fixing the Si wafer 105 on the tape 107 affixed to the frame 101 with an adhesive, while rotating the silicon nozzle 105 at a high speed of more than 1,000 revolutions per minute, the etchant nozzle 501 to the etchant 502 are transferred to the above-mentioned Si nozzle.
- the surface of the Si wafer 105 was etched by dripping on the wafer 105.
- an aqueous solution of potassium hydroxide concentration: 40%
- an etch solution other than potassium hydroxide was used. May be used.
- the etching liquid 502 was dropped while rotating the Si wafer 105 at a high speed, the air dropped on the surface of the Si wafer 105 was dropped. As shown in FIG. 5 (2), the touch liquid 502 moves at a high speed in the lateral direction on the surface of the Si nanowire 105. Therefore, the surface of the Si wafer 105 is uniformly etched, and the Si wafer 105 can be formed into a thin film without any step or damage. And came.
- the Si wafer 1 Even if the above-mentioned etchant 502 is dropped while reciprocating at a high speed of more than 1,000 reciprocations per minute, the etchant 502 can also be dropped by the Si wafer. The wafer moves laterally at high speed over the surface of the silicon wafer 105, and the surface of the silicon wafer 105 is uniformly etched and thinned without any stepped damage. And came.
- FIG. 6 is a process chart showing another embodiment of the present invention.
- the above-described embodiment is performed.
- the silicon wafer 105 is etched and thinned by the method shown in FIG. 2 to form the cross-sectional structure shown in FIG. 6 (2).
- a dicing groove 104 is formed in the Si wafer 105 and a plurality of chips 105 are formed in the Si wafer 105.
- the heating head 106 is lowered by a downward force.
- Example 2 the same tape as that used in Example 1 was used as tape 107, but other various tapes were used. There is no point in using.
- the present embodiment is an example in which the main surface of a thin chip is opposed to the main surface of a substrate, and the two are joined to each other by face down bonding. .
- the Si wafer 105 is placed on the first tape 107 pasted on the first frame 101. After fixing with an adhesive, the Si wafer 105 was thinned in the same manner as in Example 2 as shown in FIG. 7 (2).
- the first tape 107 is peeled off from the Si wafer 105 to form on the surface of the Si tape 105 second force 107 '.
- a dicing groove 104 is formed in the silicon wafer 105 to form a plurality of chips 10. Separated into 5 '.
- the substrate 102 Align the chip 105 ′ and press the heating head 106 from below to heat and pressurize it.
- the substrate 1 A thin chip 105 ′ was bonded to the layer 102 via an anisotropic conductive adhesive 103.
- the chip 105 ' is transferred to the substrate 102 after being transferred to the second tape 107'. Therefore, the front and back of the Si chip 105 ′ are opposite to those of the first embodiment, and the upper surface of the first Si wafer 105 is mounted on the substrate 102. Even if it is fixed to the top, it will be on the top. Therefore, in this embodiment, if the desired semiconductor element is formed on the surface of the Si wafer 105 after the Si wafer 105 is thinned, this semiconductor element can be obtained. Are arranged on the surface of the chip 105 formed on the surface of the substrate 102.
- An extremely thin semiconductor chip is fixed to the substrate with an adhesive, and a pad provided on the surface of the semiconductor chip and a substrate electrode provided on the surface of the substrate Are electrically connected to each other by the conductive particles contained in the adhesive, so that they are less likely to be damaged by bending, and Reliability is also high.
- the thin semiconductor chip Since the thin semiconductor chip is peeled off from the tape and adhered to the substrate in the same process, the thin semiconductor chip can be placed on the substrate without breaking it. It can be fixed.
- Each semiconductor chip can be connected to the substrate without wire bonding by fixing it to the substrate with an anisotropic conductive adhesive. .
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Wire Bonding (AREA)
- Dicing (AREA)
- Weting (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU56598/96A AU718934B2 (en) | 1995-05-18 | 1996-05-14 | Semiconductor device and method for making same |
US08/952,344 US5893746A (en) | 1995-05-18 | 1996-05-14 | Semiconductor device and method for making same |
DE69636338T DE69636338T2 (de) | 1995-05-18 | 1996-05-14 | Verfahren zur herstellung einer halbleitervorrichtung |
EP96913741A EP0828292B1 (en) | 1995-05-18 | 1996-05-14 | Manufacture of a semiconductor device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP7/120236 | 1995-05-18 | ||
JP12023695A JP3197788B2 (ja) | 1995-05-18 | 1995-05-18 | 半導体装置の製造方法 |
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US08/952,344 A-371-Of-International US5893746A (en) | 1995-05-18 | 1996-05-14 | Semiconductor device and method for making same |
US09/289,658 Continuation US6162701A (en) | 1995-05-18 | 1999-04-12 | Semiconductor device and method for making same |
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WO1996036992A1 true WO1996036992A1 (en) | 1996-11-21 |
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US (4) | US5893746A (ja) |
EP (1) | EP0828292B1 (ja) |
JP (1) | JP3197788B2 (ja) |
KR (1) | KR100606254B1 (ja) |
CN (2) | CN100466224C (ja) |
AU (1) | AU718934B2 (ja) |
CA (1) | CA2221127A1 (ja) |
DE (1) | DE69636338T2 (ja) |
TW (1) | TW420867B (ja) |
WO (1) | WO1996036992A1 (ja) |
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EP0828292A4 (en) | 2000-01-05 |
CA2221127A1 (en) | 1996-11-21 |
US6589818B2 (en) | 2003-07-08 |
CN100466224C (zh) | 2009-03-04 |
DE69636338D1 (de) | 2006-08-24 |
JP3197788B2 (ja) | 2001-08-13 |
CN1098534C (zh) | 2003-01-08 |
JPH08316194A (ja) | 1996-11-29 |
US20010000079A1 (en) | 2001-03-29 |
US6162701A (en) | 2000-12-19 |
AU5659896A (en) | 1996-11-29 |
EP0828292B1 (en) | 2006-07-12 |
DE69636338T2 (de) | 2007-07-05 |
CN1188563A (zh) | 1998-07-22 |
US6514796B2 (en) | 2003-02-04 |
AU718934B2 (en) | 2000-05-04 |
TW420867B (en) | 2001-02-01 |
US20030027376A1 (en) | 2003-02-06 |
CN1514479A (zh) | 2004-07-21 |
EP0828292A1 (en) | 1998-03-11 |
KR100606254B1 (ko) | 2006-12-07 |
KR19990014853A (ko) | 1999-02-25 |
US5893746A (en) | 1999-04-13 |
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