WO2006008789A1 - 容量素子とその製造方法、及び半導体装置 - Google Patents
容量素子とその製造方法、及び半導体装置 Download PDFInfo
- Publication number
- WO2006008789A1 WO2006008789A1 PCT/JP2004/010132 JP2004010132W WO2006008789A1 WO 2006008789 A1 WO2006008789 A1 WO 2006008789A1 JP 2004010132 W JP2004010132 W JP 2004010132W WO 2006008789 A1 WO2006008789 A1 WO 2006008789A1
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- WIPO (PCT)
- Prior art keywords
- layer
- barrier layer
- capacitive element
- capacitor
- resin
- Prior art date
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- 229910052721 tungsten Inorganic materials 0.000 claims description 4
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- 150000001875 compounds Chemical class 0.000 claims 1
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- 150000008065 acid anhydrides Chemical class 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
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Classifications
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- 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
- H01L27/04—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 a semiconductor body
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- H01L2224/45138—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3011—Impedance
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S257/00—Active solid-state devices, e.g. transistors, solid-state diodes
- Y10S257/924—Active solid-state devices, e.g. transistors, solid-state diodes with passive device, e.g. capacitor, or battery, as integral part of housing or housing element, e.g. cap
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S438/00—Semiconductor device manufacturing: process
- Y10S438/957—Making metal-insulator-metal device
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/43—Electric condenser making
- Y10T29/435—Solid dielectric type
Definitions
- Capacitor element a method for manufacturing the same, and semiconductor device
- the present invention relates to a capacitive element, a manufacturing method thereof, and a semiconductor device.
- LSIs such as microprocessors are used for mounting on a wiring board, and it is rare that only LSIs are mounted on a wiring board.
- decoupling capacitors are also mounted on a wiring board.
- the decoupling capacitor plays a role in stabilizing the operation of the LSI in the high frequency range by suppressing fluctuations in the power supply voltage when the load impedance of the LSI suddenly fluctuates, and reducing switching noise. .
- the decoupling capacitor may be referred to as a decoupling capacitor or a bypass capacitor.
- Patent Document 1 a thin film capacitor is formed by stacking a dielectric layer and an electrode on a ceramic wiring substrate, thereby reducing the wiring length between the capacitor and the LSI. I try to do it.
- an interposer-type capacitive element is formed by laminating a lower electrode, a capacitor dielectric layer, and an upper electrode on a support substrate, and between the wiring substrate and the LSI.
- a structure for inserting the interposer is proposed.
- FIGS. 1 (a) and 1 (b) are cross-sectional views when an LSI is mounted on a wiring board using such an interposer type capacitive element.
- the terminals 102 of the mother board 101, the terminals 104 of the mounting board 105, and the force first solder bumps 103 are electrically connected.
- the mounting substrate 105 is provided with a recess 105a, and an interposer type capacitive element 107 is accommodated in the recess 105a.
- the capacitive element 107 and the mounting substrate 105 are electrically connected by the second solder bump 106.
- third solder bumps 108 are provided on the upper surfaces of the capacitor element 107 and the mounting substrate 105, respectively, and the semiconductor element 109 such as an LSI is electrically connected to the capacitor element 107 and the mounting substrate 105 by the third solder bump 108. Connected to.
- the capacitive element 107 is arranged immediately below the semiconductor element 109, the wiring length between the semiconductor element 109 and the capacitive element 107 can be shortened, and the semiconductor element is formed in the recess 105a. By storing 109, the height of the package can be lowered.
- FIGS. 2 (a) and 1 (d) are cross-sectional views in the process of manufacturing a capacitor according to a conventional example.
- an insulating layer 111 such as a silicon dioxide layer is formed on a silicon substrate 110, and then a lower electrode 112, a capacitor dielectric layer 113, and an upper portion are formed thereon.
- the electrode 113 is formed in this order.
- a complex oxide dielectric material having a high relative dielectric constant is used as the capacitor dielectric layer 113 in order to obtain a large capacitor capacity.
- Pt platinum
- Ir iridium
- the lower electrode 112, the capacitor dielectric layer 113, and the upper electrode 114 constitute the capacitor Q.
- the upper electrode 112 and the capacitor dielectric layer 113 are patterned by photolithography, and a hole 115 having a depth reaching the lower electrode 112 is formed in these layers. To do.
- a photosensitive polyimide is spin coated on the entire surface and then coated.
- the insulating protective layer 116 is exposed to light and developed to form a lower electrode opening 116a in the hole 115, and the upper electrode 114 is exposed. Opening 116b is formed.
- a metal layer is grown in each of the openings 116a and 116b by employing electroplating or the like, and is formed on the lower electrode lead lead 117 and the upper part.
- the electrode lead is 118.
- the electrical characteristics of the capacitor dielectric layer 113 may be deteriorated by a reducing atmosphere such as water, thereby causing a short circuit between the electrode layers 112 and 114.
- a reducing atmosphere such as water
- Such problems can be caused by moisture in the external environment, which is not only when the polyimide is beta-betad, by the capacitor dielectric layer 113, or by solder bumps 106 and 10 8 in a reducing atmosphere (see Fig. 1 (a)). It can also be seen when the capacitor dielectric layer 113 is exposed to a reflow atmosphere.
- the capacitor dielectric layer is made of a ferroelectric material.
- ndom Access Memory protects the capacitor dielectric layer by forming protective films made of nitrides of silicon, titanium, and aluminum, as described in Patent Document 5.
- a hydrogen barrier layer is composed of a nitride of titanium or iridium or an oxide thereof, and this hydrogen barrier layer prevents hydrogen from entering the capacitor dielectric layer. It is out.
- Patent Document 7 proposes that the protective layer is composed of a metal organic compound (silicon alkoxide) that cures by reacting with water.
- a metal organic compound silicon alkoxide
- a protective layer is formed of a material that stores hydrogen, such as La Ni.
- Patent Document 1 JP-A-4-11191
- Patent Document 2 Japanese Patent Laid-Open No. 2001-68583
- Patent Document 3 Japanese Patent Laid-Open No. 2001-35990
- Patent Document 4 JP-A-7-176453
- Patent Document 5 JP-A-7-111318
- Patent Document 6 Japanese Patent Laid-Open No. 2003-282827
- Patent Document 7 Japanese Patent Laid-Open No. 7-273297
- Patent Document 8 Japanese Patent Laid-Open No. 2003-282830
- An object of the present invention is to provide a capacitive element that can shorten the connection distance with a semiconductor element without adopting the above-described interposer structure and can prevent deterioration of capacitor characteristics in a reducing atmosphere. And its manufacturing method and semiconductor device
- a base material a lower barrier layer formed on the base material, a lower electrode, a capacitor dielectric layer, and an upper electrode on the lower barrier layer.
- a capacitor having a capacitor formed in this order and an upper barrier layer covering at least the capacitor dielectric layer and the lower barrier layer.
- the capacitor is enclosed from above and below by the lower barrier layer and the upper barrier layer. For this reason, moisture in a high-humidity environment and hydrogen generated from the moisture are blocked by these barrier layers, so that a reducing atmosphere such as hydrogen causes damage such as oxygen defects to the capacitor dielectric layer. Of the capacitive element Reliability is improved.
- the capacitor dielectric layer and the upper barrier layer have the same thermal expansion coefficient.
- these adhesives are better compared to the case where the capacitor dielectric layer and the upper barrier layer are made of different materials, respectively, so that when heat or mechanical stress is applied, The film can be prevented from being peeled off at the contact portion, and the reliability of the capacitor is further increased.
- the capacitor is sandwiched between the lower barrier layer and the upper barrier layer, both of which are made of the same material, which is caused by the difference in thermal expansion coefficient.
- the film peeling is further effectively prevented.
- the thickness of the capacitive element becomes extremely thin, which can contribute to downsizing of electronic devices.
- the thickness of the capacitive element is preferably 10 zm or less.
- a semiconductor element a base material, a lower barrier layer formed on the base material, a lower electrode on the lower barrier layer, and a capacitor dielectric
- a capacitor formed by sequentially forming a body layer and an upper electrode, and an upper barrier layer covering at least the capacitor dielectric layer and the lower barrier layer, and mounted on one surface of the semiconductor element A semiconductor device having a capacitor is provided.
- the capacitive element constituting the semiconductor device has good resistance to a reducing atmosphere as described above, the reliability of the semiconductor device can be improved.
- a step of forming a base material on a support substrate a step of forming a lower barrier layer on the base material, and on the lower barrier layer Forming a first conductive layer, a dielectric layer, and a second conductive layer in order, and patterning the first conductive layer, the dielectric layer, and the second conductive layer to form a lower electrode and a capacitor dielectric Forming a capacitor composed of a body layer and an upper electrode, forming an upper barrier layer covering at least the capacitor dielectric layer and the lower barrier layer, and forming the upper barrier layer, And a step of removing the support substrate.
- a capacitor is formed on a support substrate, and the carrier is formed. Since the support substrate is removed after the formation of the capacitor, the handling during the production of the capacitive element is improved.
- the capacitor is enclosed by the lower barrier layer and the upper barrier layer, and these barrier layers are formed. Prevents hydrogen and water from entering the capacitor dielectric layer.
- the capacitor dielectric layer is prevented from deteriorating.
- a protective layer for example, there is a layer containing a polyimide resin, and the water generated when the polyimide resin is beta is effectively blocked by the lower barrier layer and the upper barrier layer.
- the step of forming the base material is preferably performed by applying a resin on the support substrate and thermosetting the resin to form a base material.
- the capacitive element can be flexible and the thickness thereof can be reduced, so that the electronic device can be reduced in size.
- an adhesion layer may be formed on the support substrate, and the base material may be formed on the adhesion layer.
- the adhesion strength between the support substrate and the adhesion layer can be increased, and they can be prevented from being separated from each other during the production, and the productivity of the capacitive element can be increased.
- An example of such an adhesion layer is a Ti-W alloy layer.
- the Ti-W alloy layer is preferably formed by DC sputtering, which applies a substrate bias. In this way, Ti-W grain growth can be controlled, so the stress in the Ti_W alloy layer is relaxed and cracks caused by the stress are difficult to enter the substrate.
- FIGS. 1A and 1B are cross-sectional views when an LSI is mounted on a wiring board using an interposer type capacitor according to a conventional example.
- FIGS. 2 (a) and 1 (d) are cross-sectional views in the course of manufacturing a capacitor according to a conventional example.
- FIG. 3 is an example of a chemical formula for releasing water by dehydration condensation polymerization reaction between acid anhydride and diamine constituting polyimide.
- FIGS. 4 (a) and 1 (c) are cross-sectional views (part 1) in the middle of manufacturing the capacitor according to the first embodiment of the present invention.
- FIG. 5 (a) and (c) are cross-sectional views (part 2) of the capacitive element according to the first embodiment of the present invention in the middle of manufacture.
- FIG. 6 (a) -1 (c) is a cross-sectional view (part 3) of the capacitive element according to the first embodiment of the present invention in the middle of manufacture.
- FIGS. 7A and 7C are cross-sectional views (part 4) of the capacitive element according to the first embodiment of the present invention during manufacture.
- FIG. 8 is a plan view of the capacitive element according to the first embodiment of the present invention.
- FIG. 9 is a cross-sectional view of a semiconductor device according to a third embodiment of the present invention.
- FIG. 10 is a cross-sectional view of a semiconductor device according to a fourth embodiment of the present invention.
- FIG. 4 is a cross-sectional view of the capacitive element according to the first embodiment of the present invention in the middle of manufacture.
- this capacitive element In order to manufacture this capacitive element, first, as shown in FIG. 4 (a), a Ti (titanium) layer having a thickness of 300 nm and a copper layer having a thickness of about 25 Onm are formed on a silicon substrate (by sputtering). (Support substrate) 10, and these are used as the adhesion layer 11.
- the silicon substrate 10 is placed in a spin coater (not shown), and a liquid (varnish) polyimide resin dissolved in a solvent is applied to the adhesion layer 11 1 under the conditions of a rotation speed of 1000 ⁇ m and a coating time of 30 seconds. Spin coat on top.
- the silicon substrate 10 is placed on a hot plate (not shown), this polyimide resin is heated at a substrate temperature of 90 ° C. and precured, and then beta cured at a substrate temperature of 400 ° C.
- a film-like substrate 12 having a thickness of about 5 / im is formed.
- the substrate 12 is preferably composed of a flexible resin material such as polyimide resin. That's right.
- a flexible resin material such as polyimide resin. That's right.
- the flexible resin material in addition to polyimide resin, epoxy resin, bismaleid'triazine (BT) resin, polytetrafluoroethylene (PTFE) resin, benzocyclobutene (BCB) resin, acrylic resin, and There are either diallyl phthalate resins.
- an epoxy varnish is spin-coated on the adhesion layer 11 to a thickness of lO x m under the conditions of a rotational speed of 2000 rpm and an application time of 30 seconds. Thereafter, this epoxy varnish is pre-beta under the condition of a substrate temperature of 60 ° C., and then this beta is performed at a substrate temperature of 300 ° C. to form a base material 12.
- the adhesion strength of the base material 12 to the silicon substrate 10 is enhanced by the adhesion layer 11, and is prevented from being peeled off from the silicon substrate 10 during the production.
- a mixed gas of Ar gas and O gas is used as the sputtering gas.
- An amorphous metal oxide layer for example, an alumina (A1 0) layer is formed to a thickness of about 10 nm as the insulating lower barrier layer 13 by the sputtering method used.
- sputtering conditions include
- a substrate temperature of 80 ° C., RF (high frequency power) power of 500 W, a gas pressure of 0 ⁇ lPa, and a flow ratio of Ar gas to 0 gas of 5: 1 are employed.
- the alumina layer constituting the lower barrier layer 13 is formed for the purpose of protecting a capacitor dielectric layer, which will be described later, from external water.
- the alumina layer has a film density of 2.6 g / cm.
- the material constituting the lower barrier layer 13 is not limited to an amorphous metal oxide material, and the lower barrier layer 12 may be composed of silicon oxide (SiO 2) or silicon nitride (Si N). .
- a Ti—W alloy layer having a thickness of about 50 nm and a Pt (platinum) layer having a thickness of 200 nm are formed in this order by DC sputtering, and these are used as the first conductive layer 14.
- the Ti-W alloy layer functions as a layer that enhances the adhesion between the Pt layer on the first conductive layer 14 and the resin layer 12, but if the stress is too large, the resin layer 12 may crack. Therefore, in the DC sputtering method for forming this Ti_W alloy layer, it is preferable to promote Ti_W grain growth and relax the stress of the Ti—W alloy layer by applying a substrate bias.
- the material constituting the first conductive layer 14 is not limited to the above, but Au, Cr, Cu, W, Pt, Pd, Ru, Ru oxide, Ir, Ir oxide, and Pt oxide One of them forms the first conductive layer 14. You may make it.
- Ba Sr TiO (hereinafter referred to as BST) as the dielectric layer 15 on the conductive layer 14 is made to a thickness of lOOnm.
- the film formation conditions for this BST are not particularly limited, but in this embodiment, the substrate temperature is 200.
- C gas pressure 0.1 lPa, flow ratio of Ar gas to 0 gas 4: 1, power applied to target 5
- the orientation is aligned in one direction by the action of the Pt layer constituting the first conductive layer 14 thereunder, and the high dielectric property is improved.
- the material constituting the dielectric layer 15 is not limited to BST, but Pb (Zr, Ti) 0 (hereinafter referred to as PZT).
- the dielectric layer 15 may be configured.
- This PZT is a mixed gas of Ar gas and ⁇ gas
- the substrate temperature is 200 ° C
- the gas pressure is 0.5 Pa
- the flow ratio of Ar gas to 0 gas is 9: 1
- the dielectric layer 15 may be composed of a composite oxide containing at least one of Sr, Ba, Pb, Zr, Bi, Ta, Ti, Mg, and Nb. .
- a Pt layer is formed to a thickness of 200 nm by sputtering, and this is used as the second conductive layer 16
- the conductive layer 16 may be configured.
- the upper electrode-shaped first resist pattern 17 is formed on the second conductive layer.
- the second conductive layer 16 is etched by Ar ion milling using the first resist pattern 17 as a mask to form the upper electrode 16a. After this, the first resist pattern
- a second resist pattern 18 having a capacitor dielectric layer shape is formed on the dielectric layer 15, and Ar ion milling is performed while using the second resist pattern 18 as a mask.
- the dielectric layer 15 is etched by the method to form a capacitor dielectric layer 15a. Thereafter, the second resist pattern 18 is removed.
- a third resist pattern 19 having a lower electrode shape is formed on the first conductive layer 14, and Ar ions are formed using the third resist pattern 19 as a mask.
- the first conductive layer 14 is etched by the milling method to form the lower electrode 14a. Thereafter, the third resist pattern 19 is removed.
- a mixed gas of Ar gas and 0 gas is used as the sputtering gas.
- Alumina (A1 0) layer is used as the insulating upper barrier layer 20 by sputtering.
- the sputtering conditions are not particularly limited, and, for example, conditions similar to the film formation conditions for the lower barrier layer 13 are employed.
- the material constituting the upper barrier layer 13 is not limited to an amorphous metal oxide material such as alumina, and the upper barrier layer 20 is composed of silicon oxide (SiO 2) or silicon nitride (Si N).
- a photosensitive polyimide resin is applied on the silane coupling agent under the conditions of a rotational speed of 1000 ⁇ m and an application time of 30 seconds.
- this photosensitive polyimide resin is exposed and developed for patterning, and beta-treated at a substrate temperature of 400 ° C. to form a protective layer 21 having a thickness of about 3 ⁇ m.
- the first hole 21a, 21b is formed on the upper electrode 16a in the protective layer 21, and the second hole 21c is formed on the lower electrode 14 not covered with the upper electrode 16a. Is formed.
- the material constituting the protective layer 21 is not limited to polyimide resin, and the protective layer 21 may be composed of a photosensitive BCB resin.
- this BCB varnish was pre-betaized at a substrate temperature of 70 ° C, then exposed and developed to form each hole 21a— 21c is formed, and this beta is performed under the condition of a substrate temperature of 260 ° C. to form a protective layer 21 having a thickness of 3 / im.
- the upper barrier layer 20 is etched by plasma etching using Ar as an etching gas while using the protective layer 21 as a mask.
- the upper barrier layer 20 is formed with first openings 20a and 20b from which the upper electrode 16a is exposed, and second openings 20c from which the lower electrode 14a is exposed.
- a Cr (chromium) layer with a thickness of 0.1 and a copper layer with a thickness of lxm were formed in this order by sputtering, and then a gold layer was formed on them by electrolytic plating to a thickness of 10 ⁇ m. To do. Thereafter, by patterning these metal layers, upper electrode lead pads 22a and 22b electrically connected to the upper electrode 16a through the first opening 20a and the first hole 21a, and the second opening 20 B and a lower electrode lead lead 22c electrically connected to the lower electrode 14a through the second hole 21c are formed.
- capacitors Q and Q are fabricated by CMP (Chemical Mechanical Polishing).
- the surface of the non-side silicon substrate 10 is polished and the thickness of the silicon substrate 10 is reduced to about 50 ⁇ to facilitate the etching of the silicon substrate 10 by the next wet etching. Thereafter, the silicon substrate 10 is immersed in hydrofluoric acid to completely remove the silicon substrate 10 by wet etching, and the adhesion layer 11 is also etched away with hydrofluoric acid.
- FIG. 8 is a plan view after this process is completed, and FIG. 7 (c) corresponds to a cross-sectional view taken along line I—I in FIG. In FIG. 8, the base 12 and the lower battery constituting the capacitors Q and Q are shown.
- the capacitive element 23 has flexibility since both the base material 12 and the protective layer 21 constituting the capacitive element 23 are made of polyimide formed by spin coating. In addition, since the capacitor dielectric layer 15a was formed by the sputtering method in combination with the above spin coating, the base layer 12 to the protective layer 21 The total thickness of the capacitive element can be reduced to 10 / m or less. When an epoxy resin is used as the base material 12, the thickness of the capacitor element 23 is about 7 / m.
- ceramic fillers and epoxy resins mainly composed of a high dielectric constant material such as BaTiO.
- a film material obtained by mixing with a resin and stretching them by the doctor blade method is used as a capacitor dielectric layer.
- the film material is inserted between the layers of the multilayer wiring board, and the capacitor is constituted by the wiring layer of the multilayer wiring board and the film material.
- a dielectric filler having an average particle size of several ⁇ m in the film material. Due to the filler, the thickness of the capacitor becomes 20 to 100 ⁇ m, and it is not possible to realize the ultra-thin capacitive element as in this embodiment.
- the capacitors Q and Q are also wrapped in the vertical force by the lower barrier layer 13 and the upper barrier layer 20. Therefore, electrode 14a
- both the base material 12 and the protective layer 21 constituting the capacitive element 23 are made of polyimide formed by spin coating, a thin and flexible capacitive element 23 can be obtained. This can contribute to downsizing of electronic devices.
- This embodiment is different from the first embodiment only in the material constituting the lower barrier layer 13 and the upper barrier layer 20, and other than that is the same as the first embodiment, so the diagram of the first embodiment 4 An explanation will be given with reference to FIG.
- the upper noher layer 20 is composed of an alumina layer.
- the barrier layer 20 is formed of the same material as the capacitor dielectric layer 15a, for example, BST or PZT, in the step of FIG. 6 (b).
- the capacitor dielectric layer 15a is made of BST, a mixed gas of Ar gas and 0 gas is used.
- the film formation conditions in this case are, for example, a flow ratio of Ar gas to 0 gas of 8: 1, gas pressure of 0.2 Pa.
- the thermal expansion coefficients of the capacitor dielectric layer 15a and the upper barrier layer 20 become the same. Therefore, compared to the case where the capacitor dielectric layer 15a and the upper barrier layer 20 are each made of different materials, their adhesion is improved, so that when heat or mechanical stress is applied, Therefore, it is possible to prevent the film from being peeled off at the part where they are in contact (part A in FIG. 7C), and the reliability of the capacitive element 23 can be further enhanced.
- the present embodiment is not limited to this, and the lower barrier layer 13 may also be made of BST, which is the same material as the capacitor dielectric layer 16a. In this way, since the lower barrier layer 13 and the upper barrier layer 20 both made of the same material are sandwiched from below the capacitor Q,
- FIG. 9 is a cross-sectional view of the semiconductor device according to the present embodiment.
- the semiconductor device includes the capacitive element manufactured in the first and second embodiments.
- the semiconductor element 32 is provided with first electrode pads 33a to 33c corresponding to the pads 22a to 22c of the capacitive element 23, respectively.
- the electrode pads 33a 33c are made of Au, and are electrically and mechanically connected to the pads 22a 22c by ultrasonic bonding.
- the function of the capacitive element 23 in this case is not particularly limited.
- the capacitive element 23 is preferably used as the coupling capacitor.
- the semiconductor element 32 is provided with a second electrode pad 34, and the second electrode pad 34 is connected to a terminal 36 of a mounting board 30 such as a mother board via a solder bump 31. Electrically and mechanically connected.
- the thickness of the capacitive element 23 manufactured in the first and second embodiments is about 10 ⁇ or less and is thinner than the height of the bump 31, the capacitive element 23 is Since it is not necessary to provide a recess for accommodating the mounting substrate 30, it can be easily mounted on the mounting substrate 30, which contributes to downsizing of the semiconductor device.
- the capacitive element 23 When the capacitive element 23 is used as a decoupling capacitor, since the capacitive element 23 is directly mounted on the semiconductor element 32, the gap between the semiconductor element 32 and the capacitive element 23 is reduced. The length of the wiring can be shortened as much as possible. As a result, the wiring inductance can be reduced, the voltage S of the semiconductor element 32 can be effectively absorbed by the capacitive element 23, and the electrical characteristics of the semiconductor element 32 can be improved.
- FIG. 10 is a cross-sectional view of the semiconductor device according to the present embodiment.
- a semiconductor element 40 such as an LSI is fixed on the die pad 41a of the lead frame 41 by an adhesive (not shown).
- electrode pads 44a-44c made of Au corresponding to the pads 23a-23c of the capacitive element 23 are formed.
- the pads 23a-23c and the electrode pads 44a-44c are electrically and mechanically connected by ultrasonic bonding.
- a bonding pad 43 is formed in the vicinity of the outer periphery of the semiconductor element 40, and the bonding pad 43 and the tip of the lead 41 are wire-bonded via a thin metal wire 42 such as a gold wire.
- the fine metal wire 42, the semiconductor element 40, and the capacitor element 23 are sealed by a sealing resin (sealing body) 45, and they are prevented from being deteriorated by contact with outside air.
- this capacitive element 23 as a decoupling capacitor for the semiconductor element 40, it is possible to improve the electrical characteristics of the semiconductor element 40 for the same reason as in the third embodiment.
- the capacitive element of the present invention since the lower NOR layer under the capacitor and the upper barrier layer covering at least the capacitor dielectric layer and the lower barrier layer are included, these The barrier layer prevents water and the like, and prevents the capacitor dielectric layer from being deteriorated by the reducing atmosphere, which in turn increases the reliability of the capacitive element.
- the capacitor is formed on the support substrate, and the support substrate is removed after the capacitor is formed. can do.
- the upper barrier layer y covering the capacitor dielectric layer and the lower barrier layer is formed.
- barrier layer Since the barrier layer is formed, these barrier layers prevent water from the outside from entering the capacitor dielectric layer, and can prevent the capacitor dielectric layer from deteriorating.
- An upper barrier layer that covers at least the capacitor dielectric layer and the lower barrier layer.
- Both the upper barrier layer and the capacitor dielectric layer are made of BST (Ba Sr TiO)
- the flexible resin material includes polyimide resin, epoxy resin, bismaleide triazine (BT) resin, polytetrafluoroethylene (PTFE) resin, benzocyclobutene (BCB) resin, acrylic resin, and
- the capacitor dielectric layer is a composite oxide containing at least one of Sr, Ba, Pb, Zr, Bi, Ta, Ti, Mg, and Nb. Capacitor element described in
- At least one of the lower electrode and the upper electrode is Au, Cr, Cu, W, Pt
- capacitor element according to appendix 1, wherein the capacitor element is composed of any one of Pd, Ru, Ru oxide, Ir, Ir oxide, and Pt oxide.
- the upper barrier layer on the upper electrode and the lower electrode is respectively formed on the upper barrier layer.
- a base material a lower barrier layer formed on the base material; a capacitor formed by sequentially forming a lower electrode, a capacitor dielectric layer, and an upper electrode on the lower barrier layer; and at least the above-mentioned A capacitor element having a capacitor dielectric layer and an upper barrier layer covering the lower barrier layer, and mounted on one surface of the semiconductor element;
- a semiconductor device comprising: (6)
- the other surface of the semiconductor element is fixed on the die pad, the bonding pad on one surface of the semiconductor element and the lead are wire-bonded by a thin metal wire, and at least the capacitor element, the semiconductor element, and 15.
- first conductive layer, the dielectric layer, and the second conductive layer to form a capacitor composed of a lower electrode, a capacitor dielectric layer, and an upper electrode; and at least the capacitor dielectric Forming an upper barrier layer covering the body layer and the lower noria layer;
- a method for manufacturing a capacitive element comprising: (7)
- Appendix 21 The method for manufacturing a capacitive element according to appendix 17, further comprising a step of forming a protective layer on the upper barrier layer.
- Appendix 22 The method for manufacturing a capacitive element according to appendix 21, wherein a layer containing a polyimide resin is formed as the protective layer.
- the supplementary note 17 is characterized in that the step of forming the base material is performed by applying a resin on the support substrate and thermally curing the resin to obtain the base material.
- BT polytetrafluoroethylene
- PTFE polytetrafluoroethylene
- BCB benzocyclobutene
- Appendix 27 The method for manufacturing a capacitive element according to appendix 26, wherein a Ti-W alloy layer is formed as the adhesion layer.
- Appendix 28 The method for manufacturing a capacitive element according to appendix 27, wherein the Ti_W alloy layer is formed by a DC sputtering method in which a substrate bias is applied.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2006527680A JP4499731B2 (ja) | 2004-07-15 | 2004-07-15 | 容量素子とその製造方法、及び半導体装置 |
PCT/JP2004/010132 WO2006008789A1 (ja) | 2004-07-15 | 2004-07-15 | 容量素子とその製造方法、及び半導体装置 |
US11/581,383 US7439199B2 (en) | 2004-07-15 | 2006-10-17 | Capacitive element, method of manufacture of the same, and semiconductor device |
US12/222,764 US8264063B2 (en) | 2004-07-15 | 2008-08-15 | Capacitive element, method of manufacture of the same, and semiconductor device |
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PCT/JP2004/010132 WO2006008789A1 (ja) | 2004-07-15 | 2004-07-15 | 容量素子とその製造方法、及び半導体装置 |
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US11/581,383 Continuation US7439199B2 (en) | 2004-07-15 | 2006-10-17 | Capacitive element, method of manufacture of the same, and semiconductor device |
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PCT/JP2004/010132 WO2006008789A1 (ja) | 2004-07-15 | 2004-07-15 | 容量素子とその製造方法、及び半導体装置 |
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US (2) | US7439199B2 (ja) |
JP (1) | JP4499731B2 (ja) |
WO (1) | WO2006008789A1 (ja) |
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JPWO2008105535A1 (ja) * | 2007-03-01 | 2010-06-03 | 日本電気株式会社 | 半導体装置及びその製造方法 |
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2006
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2008
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EP2008308A2 (en) * | 2006-04-14 | 2008-12-31 | Allegro Microsystems Inc. | Methods and apparatus for integrated circuit having multiple dies with at least one on chip capacitor |
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JP2018063980A (ja) * | 2016-10-11 | 2018-04-19 | Tdk株式会社 | 薄膜コンデンサ |
Also Published As
Publication number | Publication date |
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JP4499731B2 (ja) | 2010-07-07 |
US20070034989A1 (en) | 2007-02-15 |
JPWO2006008789A1 (ja) | 2008-05-01 |
US20080315358A1 (en) | 2008-12-25 |
US7439199B2 (en) | 2008-10-21 |
US8264063B2 (en) | 2012-09-11 |
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