WO2018025403A1 - 半導体コンデンサ - Google Patents
半導体コンデンサ Download PDFInfo
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- WO2018025403A1 WO2018025403A1 PCT/JP2016/073116 JP2016073116W WO2018025403A1 WO 2018025403 A1 WO2018025403 A1 WO 2018025403A1 JP 2016073116 W JP2016073116 W JP 2016073116W WO 2018025403 A1 WO2018025403 A1 WO 2018025403A1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 285
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
- H01L28/40—Capacitors
- H01L28/60—Electrodes
- H01L28/75—Electrodes comprising two or more layers, e.g. comprising a barrier layer and a metal layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
- H01L28/40—Capacitors
- H01L28/60—Electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L21/77—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
- H01L21/82—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 to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—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 to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
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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
- H01L27/04—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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- 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
- H01L27/04—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
- H01L27/08—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 including only semiconductor components of a single kind
- H01L27/0805—Capacitors only
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
- H01L28/40—Capacitors
- H01L28/60—Electrodes
- H01L28/82—Electrodes with an enlarged surface, e.g. formed by texturisation
- H01L28/90—Electrodes with an enlarged surface, e.g. formed by texturisation having vertical extensions
- H01L28/91—Electrodes with an enlarged surface, e.g. formed by texturisation having vertical extensions made by depositing layers, e.g. by depositing alternating conductive and insulating layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66083—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by variation of the electric current supplied or the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched, e.g. two-terminal devices
- H01L29/66181—Conductor-insulator-semiconductor capacitors, e.g. trench capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
- H01L29/92—Capacitors having potential barriers
- H01L29/94—Metal-insulator-semiconductors, e.g. MOS
- H01L29/945—Trench capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
- H01L28/40—Capacitors
Definitions
- the present invention relates to a semiconductor capacitor having a structure in which an insulator is sandwiched between electrode groups.
- a capacitor using a semiconductor is known.
- a trench electrode is formed on one main surface of a semiconductor substrate.
- a trench is formed on one main surface of the semiconductor substrate.
- an oxide film as an insulating film is formed in the trench.
- a trench electrode in which the trench is filled with an electrode material is formed on the surface of the semiconductor substrate.
- an oxide film as a dielectric is formed between adjacent trench electrodes.
- a capacitor manufactured through this process forms a horizontal capacitor structure between trench electrodes (see, for example, Patent Document 1).
- a capacitor using a semiconductor has different characteristics such as a withstand voltage and a conductance according to a requirement required for the capacitor. Thus, it is necessary to change the characteristics of the capacitor every time the demand changes.
- a plurality of capacitors having the same characteristics are provided on the semiconductor substrate. For this reason, the conventional semiconductor capacitor has a problem that a circuit made of a semiconductor substrate cannot meet various requirements.
- An object of the present invention is made by paying attention to the above problem, and an object of the present invention is to provide a semiconductor capacitor capable of meeting various requirements with a circuit formed of a semiconductor substrate.
- the present invention comprises a semiconductor substrate, an electrode group formed on the semiconductor substrate, and an insulator, and a plurality of capacitors are formed.
- the plurality of capacitors have a structure in which an insulator is sandwiched between each electrode group.
- the plurality of capacitors are set so that at least one of the tolerance, which is the ability of the capacitor to withstand a specified voltage, and the conductance, which is the ease of leakage current flow in the capacitor, are different.
- FIG. 3 is a plan view showing a planar structure of the semiconductor capacitor in Example 1.
- FIG. FIG. 3 is a development explanatory view showing the internal structure of the semiconductor capacitor in Example 1;
- FIG. 6 is a development explanatory view showing the internal structure of a semiconductor capacitor in Example 2.
- 6 is an equivalent circuit diagram showing a circuit configuration of a semiconductor capacitor in Example 2.
- FIG. 6 is a cross-sectional view showing a trench formation process in the method of manufacturing a semiconductor capacitor in Example 2.
- FIG. 6 is a cross-sectional view showing a trench formation process in the method of manufacturing a semiconductor capacitor in Example 2.
- FIG. 7 is a cross-sectional view showing an insulating film forming process of a method for manufacturing a semiconductor capacitor in Example 2.
- FIG. 6 is a cross-sectional view showing an electrode group forming process in a method for manufacturing a semiconductor capacitor in Example 2.
- FIG. FIG. 6 is a development explanatory view showing the internal structure of a semiconductor capacitor in Example 3.
- 6 is a plan view showing a planar structure of a semiconductor capacitor in Example 4.
- FIG. 6 is a plan view showing a planar structure of a semiconductor capacitor in Example 5.
- FIG. 10 is a development explanatory view showing the internal structure of a semiconductor capacitor in Example 5.
- 7 is a plan view showing a planar structure of a semiconductor capacitor in Example 6.
- FIG. 10 is a plan view showing a semiconductor capacitor arrangement structure in Example 6.
- FIG. 10 is a cross-sectional view showing a modification of the insulating film forming process of the semiconductor capacitor manufacturing method in Example 2.
- 6 is a cross-sectional view showing a modification of the electrode group forming process of the method for manufacturing a semiconductor capacitor in Example 2.
- FIG. 10 is a cross-sectional view showing a modification of the insulating film forming process of the semiconductor capacitor manufacturing method in Example 2.
- 6 is a cross-sectional view showing a modification of the electrode group forming process of the method for manufacturing a semiconductor capacitor in Example 2.
- FIG. 1 shows a planar structure of a semiconductor capacitor in Example 1
- FIG. 2 shows an internal structure.
- the configuration of the semiconductor capacitor in the first embodiment will be described by dividing it into an “overall configuration” and an “arrangement configuration”.
- the positional relationship of each member will be described with reference to an XYZ orthogonal coordinate system.
- the width direction of the semiconductor capacitor is defined as the X-axis direction (+ X direction).
- the front-rear direction of the semiconductor capacitor is perpendicular to the Y-axis direction (+ Y direction), perpendicular to the X-axis direction and the Y-axis direction, and the height direction of the semiconductor capacitor is defined as the Z-axis direction (+ Z direction).
- the + X direction is appropriately used as the right direction (the -X direction is the left direction)
- the + Y direction is the forward direction (the -Y direction is the backward direction)
- the + Z direction is the upward direction (the -Z direction is the downward direction).
- the “lateral capacitor” means a capacitor having a terminal electrode on one surface (for example, the upper surface) of the substrate.
- the semiconductor capacitor 1A includes a semiconductor substrate 2A (for example, silicon oxide), an insulator 2B (for example, silicon oxide), and an electrode group 4 (for example, polycrystalline silicon).
- the semiconductor capacitor 1A is manufactured by performing a trench formation process, an insulating film formation process, and an electrode group formation process in this order.
- the substrate material for example, silicon
- a two-dot chain line in FIG. 1 indicates a boundary between the semiconductor substrate 2A and the insulator 2B.
- a first trench T1 (groove), a second trench T2 (groove), and a third trench T3 (groove) are formed on the upper surface 2Au (front surface) of the semiconductor substrate 2A.
- a first unit electrode 41 is formed in the first trench T1.
- the second unit electrode 42 is formed in the second trench T2.
- the third unit electrode 43 is formed in the third trench T3.
- the insulator 2B includes a first insulator 2B1, a second insulator 2B2, and a third insulator 2B3.
- the first insulator 2 ⁇ / b> B ⁇ b> 1 is sandwiched between the first unit electrode 41 and the second unit electrode 42.
- the first insulator 2B1 is a dielectric of the first capacitor C1.
- the second insulator 2B2 is sandwiched between the second unit electrode 42 and the third unit electrode 43 as shown in FIG.
- the second insulator 2B2 becomes a dielectric of the second capacitor C2.
- the third insulator 2B3 is sandwiched between the first unit electrode 41 and the third unit electrode 43 as shown in FIG.
- the third insulator 2B3 becomes a dielectric of the third capacitor C3.
- the first capacitor C1, the second capacitor C2, and the third capacitor C3 are set so that at least one of tolerance and conductance is different.
- tolerance refers to the ability of a capacitor to withstand a specified voltage, and includes the concepts of withstand voltage and insulation resistance.
- breakdown voltage refers to a voltage that can be applied to the capacitor for a specified time without causing an insulation breakage, and is proportional to the thickness of an insulator serving as a dielectric.
- Insulator resistance refers to an electrical resistance value between insulated circuits or conductors.
- Conductance refers to the ease of leakage current flow in a capacitor, and is proportional to the surface area of unit electrodes constituting the electrode group.
- the electrode group 4 includes a first unit electrode 41, a second unit electrode 42, and a third unit electrode 43, as shown in FIG.
- the first unit electrode 41 has a trench electrode structure embedded in the first trench T1.
- the second unit electrode 42 has a trench electrode structure embedded in the second trench T2.
- the third unit electrode 43 has a trench electrode structure embedded in the third trench T3.
- a first capacitor C1 is disposed between the first unit electrode 41 and the second unit electrode.
- a second capacitor C2 is disposed between the second unit electrode 42 and the third unit electrode 43, as shown in FIGS.
- a third capacitor C3 is disposed between the first unit electrode 41 and the third unit electrode 43, as shown in FIGS.
- the thickness of the first insulator 2B1, the second insulator 2B2, and the third insulator 2B3 is W as shown in FIG.
- the thickness W of the first insulator 2B1 is proportional to the breakdown voltage of the first capacitor C1.
- the thickness W of the second insulator 2B2 is proportional to the breakdown voltage of the second capacitor C2, as shown in FIG.
- the thickness W of the third insulator 2B3 is proportional to the withstand voltage of the third capacitor C3.
- the thicknesses of the first insulator 2B1, the second insulator 2B2, and the third insulator 2B3 are the same W.
- the first capacitor C1, the second capacitor C2, and the third capacitor C3 have the same voltage that can be applied for a specified time without causing insulation damage.
- the surface area of the first unit electrode 41 is S1, as shown in FIG.
- the surface area of the second unit electrode 42 is S1, as shown in FIG. That is, the surface area S1 of the first unit electrode 41 is equal to the surface area S1 of the second unit electrode 42 as shown in FIG.
- the surface area of the third unit electrode 43 is S2, as shown in FIG. As shown in FIG. 1, the surface area S1 of the first unit electrode 41 and the second unit electrode 42 is smaller than the surface area S2 of the third unit electrode 43 (S1 ⁇ S2).
- the surface area S1 of the first unit electrode 41 is proportional to the conductance of the first capacitor C1, as shown in FIG.
- the surface area S2 of the second unit electrode 42 is proportional to the conductance of the second capacitor C2, as shown in FIG.
- the surface area S3 of the third unit electrode 43 is proportional to the conductance of the third capacitor C3. That is, as shown in FIG. 1, the third capacitor C3 has a structure in which leakage current flows more easily than the first capacitor C1 and the second capacitor C2.
- a capacitor having a horizontal semiconductor capacitor structure between trench electrodes is known.
- a trench is formed on one main surface of a semiconductor substrate.
- an oxide film as an insulating film is formed in the trench.
- an electrode formed by filling the trench with an electrode material is formed on the surface of the semiconductor substrate.
- an oxide film as a dielectric is formed between adjacent trench electrodes.
- a capacitor having a two-terminal capacitor is known.
- this semiconductor capacitor a plurality of capacitors are connected in parallel by adjacent trench electrodes formed on a semiconductor substrate and an insulating film sandwiched between the trench electrodes.
- a semiconductor capacitor has a demand to increase the ability of the capacitor to withstand a specified voltage and a demand to suppress a leakage current flowing through the capacitor.
- characteristics such as the capacitance of the capacitor are different.
- the conventional semiconductor capacitor has the same capacity of a plurality of capacitors formed on the semiconductor substrate.
- the region of the semiconductor substrate has no particular electrical role other than the role as a support member. Therefore, a conventional semiconductor capacitor is not assumed to have a structure in which a plurality of capacitors are connected in a mesh pattern, for example, a three-terminal capacitor. For this reason, there exists a subject that the circuit which consists of semiconductor substrates cannot respond to various requests.
- the first capacitor C1, the second capacitor C2, and the third capacitor C3 are resistant to the ability of the capacitor to withstand a specified voltage, and conductance that is easy to flow a leak current in the capacitor.
- at least one is set to be different. That is, the first capacitor C1, the second capacitor C2, and the third capacitor C3 that are different in at least one of tolerance and conductance are provided on the semiconductor substrate 2A. For this reason, the voltage that can be applied for a specified time without causing insulation breakage and the ease of flow of the leakage current differ for each of the first capacitor C1, the second capacitor C2, and the third capacitor C3.
- the semiconductor capacitor 1A includes a semiconductor substrate 2A and an electrode group 4 formed on the semiconductor substrate 2A, and the electrode group 4 is sandwiched between insulators 2B. Therefore, a connection point between the first capacitor C1, the second capacitor C2, and the third capacitor C3 is between the first unit electrode 41, the second unit electrode 42, and the third unit electrode 43. Thereby, the semiconductor capacitor 1A becomes a three-terminal capacitor.
- the number of terminals of the semiconductor capacitor 1A can be increased to three terminals, which is larger than the conventional two terminals. Accordingly, a capacitor circuit in which the first capacitor C1, the second capacitor C2, and the third capacitor C3 are connected can be formed on the semiconductor substrate, which can contribute to the reduction in size, weight, and cost of the capacitor component.
- the first unit electrode 41, the second unit electrode 42, and the third unit electrode 43 constituting the electrode group 4 are formed in the first trench T1 and the second trench T2 formed in the upper surface 2Au of the semiconductor substrate 2A.
- the thickness W between the first unit electrode 41, the second unit electrode 42, and the third unit electrode 43 is proportional to the breakdown voltage of the first capacitor C1, the second capacitor C2, and the third capacitor C3. That is, the breakdown voltage of the first capacitor C1, the second capacitor C2, and the third capacitor C3 increases in proportion to the thickness W between the first unit electrode 41, the second unit electrode 42, and the third unit electrode 43. For this reason, the breakdown voltage of the first capacitor C1, the second capacitor C2, and the third capacitor C3 increases in proportion to the thickness W of the first insulator 2B1, the second insulator 2B2, and the third insulator 2B3.
- the thicknesses of the first trench T1, the second trench T2, and the third trench T3 can be set in order to achieve the withstand voltages necessary for the first capacitor C1, the second capacitor C2, and the third capacitor C3. Therefore, the withstand voltage required for the first capacitor C1, the second capacitor C2, and the third capacitor C3 can be controlled by the thickness of the first trench T1, the second trench T2, and the third trench T3.
- a semiconductor substrate semiconductor substrate 2A
- an electrode group electrode group 4 formed on the semiconductor substrate (semiconductor substrate 2A), and an insulator (insulator 2B).
- a semiconductor capacitor semiconductor capacitor 1A in which a plurality of capacitors (first capacitor C1, second capacitor C2, and third capacitor C3) having a structure in which an insulator (insulator 2B) is sandwiched between them are formed.
- the plurality of capacitors are at least of a resistance that is an ability of the capacitor to withstand a specified voltage and a conductance that is an easy flow of a leakage current in the capacitor.
- semiconductor capacitor 1A semiconductor capacitor 1A
- circuit first capacitor C1, second capacitor C2, and third capacitor C3
- Each unit electrode (first unit electrode 41, second unit electrode 42, and third unit electrode 43) constituting the electrode group (electrode group 4) is the surface (upper surface 2Au) of the semiconductor substrate (semiconductor substrate 2A). 2 has a trench electrode structure embedded in the grooves (first trench T1, second trench T2, and third trench T3) formed in (FIG. 2). For this reason, in addition to the effect of (1), the capacitance of the capacitors (the first capacitor C1, the second capacitor C2, and the third capacitor C3) can be increased as compared with the conventional case.
- the thickness between the unit electrodes is the same as the unit electrode (the first unit electrode 41, the second unit electrode 42, and the third unit electrode 43). It is proportional to the withstand voltage of the capacitors (the first capacitor C1, the second capacitor C2, and the third capacitor C3) that are formed between them (FIG. 1). For this reason, in addition to the effect of (1) or (2), the withstand voltage of the necessary capacitors (first capacitor C1, second capacitor C2, and third capacitor C3) is changed to the groove (first trench T1, second trench T2, and It can be controlled by the thickness between the third trenches T3).
- Example 2 is an example in which one unit electrode in the electrode group is a semiconductor substrate.
- the semiconductor capacitor in Example 2 is applied to an XY capacitor.
- the configuration of the semiconductor capacitor according to the second embodiment will be described by being divided into “overall configuration”, “arrangement configuration”, “circuit configuration”, and “method of manufacturing a semiconductor capacitor”.
- the “XY capacitor” is configured by a combination of an X capacitor and a Y capacitor, and is used for suppressing electromagnetic noise.
- Electric noise is classified into two types of noise depending on the conduction method (mode), and includes normal mode noise and common mode noise.
- “Normal mode noise” refers to electromagnetic noise generated between power supply lines.
- Common mode noise refers to electromagnetic noise generated between the power supply line and the housing ground.
- the “casing ground” is connected to the ground and is provided by, for example, a semiconductor substrate.
- FIG. 3 shows the internal structure of the semiconductor capacitor in the second embodiment. Hereinafter, based on FIG. 3, the whole structure of the semiconductor capacitor in Example 2 is demonstrated.
- the semiconductor capacitor 1B includes a semiconductor substrate 2 (for example, silicon), an insulator 3 (for example, silicon oxide), an electrode group 4 (for example, polycrystalline silicon), and a terminal electrode 5 (for example, aluminum). .
- the semiconductor substrate 2 becomes one unit electrode in the electrode group.
- a first trench T1 (groove) and a second trench T2 (groove) are formed on the upper surface 2U (front surface) of the semiconductor substrate 2.
- a first unit electrode 41 is formed in the first trench T1.
- a second unit electrode 42 is formed in the second trench T2.
- a contact region 2Dc for obtaining electrical continuity with the semiconductor substrate 2 is formed on the lower surface 2D different from the upper surface 2U on which the first unit electrode 41 and the second unit electrode 42 are formed in the semiconductor substrate 2.
- the contact region 2Dc is indicated by a bold line.
- the “contact region” refers to a portion where the terminal electrode 5 and the semiconductor substrate 2 are connected.
- the insulator 3 includes a first insulator 31, a second insulator 32, and a third insulator 33.
- the first insulator 31 is sandwiched between the first unit electrode 41 and the second unit electrode 42.
- the first insulator 31 becomes a dielectric of the first capacitor C1.
- the second insulator 32 is sandwiched between the first unit electrode 41 and the semiconductor substrate 2.
- the second insulator 32 becomes a dielectric of the second capacitor C2.
- the third insulator 33 is sandwiched between the second unit electrode 42 and the semiconductor substrate 2.
- the third insulator 33 becomes a dielectric of the third capacitor C3.
- the first capacitor C1, the second capacitor C2, and the third capacitor C3 are set so that at least one of tolerance and conductance is different.
- the electrode group 4 includes a first unit electrode 41 and a second unit electrode 42.
- the first unit electrode 41 has a trench electrode structure embedded in the first trench T1.
- the second unit electrode 42 has a trench electrode structure embedded in the second trench T2.
- the terminal electrode 5 is formed on the lower surface 2D of the semiconductor substrate 2.
- the first capacitor C1 is disposed between the first unit electrode 41 and the second unit electrode 42.
- a second capacitor C ⁇ b> 2 is disposed between the first unit electrode 41 and the semiconductor substrate 2.
- a third capacitor C3 is disposed between the second unit electrode 42 and the semiconductor substrate 2.
- the thickness of the first insulator 31 is W1.
- the thickness of the second insulator 32 is W2.
- the thickness of the third insulator 33 is W2.
- the thickness W2 of the second insulator 32 is the same as the thickness W2 of the third insulator 33.
- the thickness W1 of the first insulator 31 is larger than the thickness W2 of the second insulator 32 and the third insulator 33 (W2 ⁇ W1).
- the thickness W1 of the first insulator 31 is proportional to the breakdown voltage of the first capacitor C1.
- the thickness W2 of the second insulator 32 is proportional to the breakdown voltage of the second capacitor C2.
- the thickness W2 of the third insulator 33 is proportional to the breakdown voltage of the third capacitor C3. That is, the voltage that can be applied to the first capacitor C1 for a specified time without causing insulation damage is larger than that of the second capacitor C2 and the third capacitor C3.
- FIG. 4 shows a circuit configuration of the semiconductor capacitor in the second embodiment.
- the circuit configuration will be described with reference to FIG.
- the semiconductor capacitor of Example 1 was provided with an X capacitor
- the semiconductor capacitor in Example 2 was provided with an X capacitor and a Y capacitor.
- the first capacitor C1 functions as an X capacitor that suppresses normal mode noise.
- the first capacitor C1 is connected to the power supply lines L1 and L2.
- the second capacitor C2 and the third capacitor C3 function as Y capacitors that suppress common mode noise.
- the second capacitor C2 is connected to the power supply line L1 and the housing ground FG.
- the third capacitor C3 is connected to the power supply line L2 and the housing ground FG.
- the “X capacitor” is a capacitor connected between the power supply lines, and in order to increase the effect of suppressing voltage fluctuation of the power supply line, it is preferable that the capacitance is large.
- the “Y capacitor” is a configuration in which a capacitor is connected between each power line and the housing ground, and is used for common mode noise suppression. Since the “Y capacitor” is connected between each power supply line and the housing ground, it is necessary to suppress the leakage current for safety.
- FIGS. 5 to 8 show a method of manufacturing a semiconductor capacitor according to the second embodiment.
- a method of manufacturing a semiconductor capacitor according to the second embodiment will be described with reference to FIGS.
- the trench formation process (FIGS. 5 and 6), the insulating film formation process (FIG. 7), and the electrode group formation process (FIG. 8) are performed in this order to manufacture the semiconductor capacitor 1B.
- a semiconductor substrate 2 is prepared as shown in FIG. Then, although there exists an oxide film deposition process which deposits an oxide film on the semiconductor substrate 2 by CVD method, illustration is abbreviate
- the insulator formation process In the insulator formation process, first, there is a thermal oxidation process in which the semiconductor substrate 2 cleaned in the substrate cleaning process is put in an oxidation furnace and heat is applied in oxygen, but the illustration is omitted. By this thermal oxidation process, the insulator 3 is formed on the semiconductor substrate 2. Subsequently, as shown in FIG. 7, the upper surface 2 ⁇ / b> U of the semiconductor substrate 2 is exposed by an insulator removing process for removing a part of the insulator 3. Thereby, an insulator formation process is completed. Note that the oxide film thickness FT1 in FIG. 7 indicates the oxide film thickness of the insulator 3 formed at the bottom of the trench T.
- Electrode group formation process In the electrode group formation process, first, there is an electrode material deposition step in which an electrode material is deposited using the CVD method on the upper surface 2U of the semiconductor substrate 2 from which a part of the insulator 3 has been removed in the insulator removal step. Illustration is omitted.
- the two trenches T are filled with the electrode material.
- the first unit electrode 41 and the second unit electrode 42 are formed in each trench T.
- the upper surface 2 ⁇ / b> U of the semiconductor substrate 2 is exposed by an electrode material removing process for removing a part of the electrode material. Thereby, an electrode group formation process is completed.
- one unit electrode in the electrode group is the semiconductor substrate 2. That is, the semiconductor substrate 2 becomes one unit electrode. For this reason, the semiconductor substrate 2 is used as one electrode of the second capacitor C2 and the third capacitor C3.
- a capacitor circuit can be configured with the semiconductor substrate 2 as a connection point. Accordingly, the second capacitor C2 can be formed between the first unit electrode 41 and the semiconductor substrate 2, and the third capacitor C3 can also be formed between the second unit electrode 42 and the semiconductor substrate 2. Therefore, it is possible to function as a capacitor between the first unit electrode 41 and the second unit electrode 42 and the semiconductor substrate 2 as well as between the first unit electrode 41 and the second unit electrode 42.
- Example 2 the contact region for obtaining electrical continuity with the semiconductor substrate 2 is formed on a surface 2D different from the surface 2U on the semiconductor substrate 2 where the first unit electrode 41 and the second unit electrode 42 are formed. That is, the contact region with the semiconductor substrate 2 is formed on the lower surface 2D of the semiconductor substrate 2. Therefore, one electrode constituted by the semiconductor substrate 2 can be constituted by using a surface 2D different from the other first unit electrode 41 and second unit electrode 42.
- the first capacitor C ⁇ b> 1 is disposed between the first unit electrode 41 and the second unit electrode 42. That is, the first capacitor C1 functions as an X capacitor. Thereby, it is possible to control the first unit electrode 41 and the second unit electrode 42 to be deeper or the number of the first unit electrode 41 and the second unit electrode 42 to be increased. Accordingly, the capacitance of the first capacitor C1 can be increased according to the control of the depth and the number of parallel units of the first unit electrode 41 and the second unit electrode 42.
- the second capacitor C ⁇ b> 2 is formed between the first unit electrode 41 and the semiconductor substrate 2
- the third capacitor C ⁇ b> 3 is formed between the second unit electrode 42 and the semiconductor substrate 2. That is, the second capacitor C2 and the third capacitor C3 function as Y capacitors. Accordingly, the bottoms of the first trench T1 and the second trench T2 function as the second capacitor C2 and the third capacitor C3. Therefore, although the capacitances of the second capacitor C2 and the third capacitor C3 are small, the leakage current can be suppressed accordingly. Since other operations are the same as those of the first embodiment, description thereof is omitted.
- Electrode group 4 One unit electrode in the electrode group (electrode group 4) is a semiconductor substrate (semiconductor substrate 2) (FIG. 3). Therefore, in addition to between the unit electrodes (the first unit electrode 41 and the second unit electrode 42), a capacitor is also provided between the unit electrode (the first unit electrode 41 and the second unit electrode 42) and the semiconductor substrate (semiconductor substrate 2). It becomes possible to function as (second capacitor C2 and third capacitor C3).
- the contact region for obtaining electrical continuity with the semiconductor substrate is a surface on which the unit electrodes (first unit electrode 41 and second unit electrode 42) are formed in the semiconductor substrate (semiconductor substrate 2). It is formed on a surface (surface 2D) different from (surface 2U). For this reason, one electrode comprised by a semiconductor substrate (semiconductor substrate 2) can be comprised using the surface (surface 2D) different from another unit electrode (the 1st unit electrode 41 and the 2nd unit electrode 42).
- Example 3 is an example in which the number of unit electrodes is increased from two to three compared to Example 2.
- FIG. 9 shows the internal structure of the semiconductor capacitor in the third embodiment.
- the configuration of the semiconductor capacitor according to the third embodiment will be described by being divided into “overall configuration” and “arrangement configuration”. Note that the “method for manufacturing a semiconductor capacitor” in the third embodiment is the same as that in the second embodiment, and thus the description thereof is omitted.
- the semiconductor capacitor 1C includes a semiconductor substrate 2 (for example, silicon), an insulator 3 (for example, silicon oxide), an electrode group 4 (for example, polycrystalline silicon), and a terminal electrode 5 (for example, aluminum). .
- the semiconductor substrate 2 becomes one unit electrode in the electrode group.
- a first trench T1 (groove), a second trench T2 (groove), and a third trench T3 (groove) are formed on the upper surface 2U (front surface) of the semiconductor substrate 2.
- a first unit electrode 41 is formed in the first trench T1.
- a second unit electrode 42 is formed in the second trench T2.
- a third unit electrode 43 is formed in the third trench T3.
- a contact region 2Dc for obtaining electrical continuity with the semiconductor substrate 2 is formed on the lower surface 2D different from the upper surface 2U on which the first unit electrode 41, the second unit electrode 42, and the third unit electrode 43 are formed in the semiconductor substrate 2. Is done. In FIG. 9, the contact region 2Dc is indicated by a bold line.
- the insulator 3 includes a first insulator 31, a second insulator 32, a third insulator 33, a fourth insulator 34, and a fifth insulator 35.
- the first insulator 31 is sandwiched between the first unit electrode 41 and the second unit electrode 42.
- the first insulator 31 becomes a dielectric of the first capacitor C1.
- the second insulator 32 is sandwiched between the first unit electrode 42 and the third unit electrode 43.
- the second insulator 32 becomes a dielectric of the second capacitor C2.
- the third insulator 33 is sandwiched between the first unit electrode 41 and the semiconductor substrate 2.
- the third insulator 33 becomes a dielectric of the third capacitor C3.
- the fourth insulator 34 is sandwiched between the second unit electrode 42 and the semiconductor substrate 2.
- the fourth insulator 34 becomes a dielectric of the fourth capacitor C4.
- the fifth insulator 35 is sandwiched between the third unit electrode 43 and the semiconductor substrate 2.
- the fifth insulator 35 becomes a dielectric of the fifth capacitor C5.
- the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 are set to have at least one of tolerance and conductance different.
- the electrode group 4 includes a first unit electrode 41, a second unit electrode 42, and a third unit electrode 43.
- the first unit electrode 41 has a trench electrode structure embedded in the first trench T1.
- the second unit electrode 42 has a trench electrode structure embedded in the second trench T2.
- the third unit electrode 43 has a trench electrode structure embedded in the third trench T3. Since other configurations are the same as those of the second embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted.
- a first capacitor C ⁇ b> 1 is disposed between the first unit electrode 41 and the second unit electrode 42.
- a second capacitor C2 is disposed between the second unit electrode 42 and the third unit electrode 43.
- a third capacitor C3 is disposed between the first unit electrode 41 and the semiconductor substrate 2.
- a fourth capacitor C4 is disposed between the second unit electrode 42 and the semiconductor substrate 2.
- a fifth capacitor C5 is disposed between the third unit electrode 43 and the semiconductor substrate 2.
- the thickness of the first insulator 31 and the second insulator 32 is W3.
- the thicknesses of the third insulator 33, the fourth insulator 34, and the fifth insulator 35 are W4.
- the thickness W3 of the first insulator 31 and the second insulator 32 is larger than the thickness W4 of the third insulator 33, the fourth insulator 34, and the fifth insulator 35 (W4 ⁇ W3).
- the thicknesses of the first insulator 31, the second insulator 32, the third insulator 33, the fourth insulator 34, and the fifth insulator 35 are as follows: the first capacitor C1, the second capacitor C2, the third capacitor C3, It is proportional to the breakdown voltage of the capacitor C4 and the fifth capacitor C5. In other words, the first capacitor C1 and the second capacitor C2 have a larger voltage that can be applied for a specified time without causing an insulation breakage compared to the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5.
- one unit electrode in the electrode group is the semiconductor substrate 2. That is, the semiconductor substrate 2 becomes one unit electrode. For this reason, the semiconductor substrate 2 is used as one electrode of the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5.
- a capacitor circuit can be configured with the semiconductor substrate 2 as a connection point.
- the third capacitor C3 can be formed between the first unit electrode 41 and the semiconductor substrate 2
- the fourth capacitor C4 can be formed between the second unit electrode 42 and the semiconductor substrate 2
- the third unit electrode A fifth capacitor C ⁇ b> 5 can also be configured between 43 and the semiconductor substrate 2.
- the third unit electrode 41, the second unit electrode 42, the third unit electrode 43, and the semiconductor substrate 2 are not only between the first unit electrode 41, the second unit electrode 42, and the third unit electrode 43, but also between the semiconductor substrate 2 and the third unit electrode 43. It becomes possible to function as the capacitor C3, the fourth capacitor C4, and the fifth capacitor C5.
- the number of capacitors arranged in the semiconductor capacitor 1C can be increased from three to five. Therefore, compared with the case where two unit electrodes are provided, the capacity of the entire semiconductor capacitor 1C can be increased.
- Example 3 the contact region 2Dc for obtaining electrical continuity with the semiconductor substrate 2 is different from the surface 2U on the semiconductor substrate 2 on which the first unit electrode 41, the second unit electrode 42, and the third unit electrode 43 are formed. Formed on surface 2D. That is, the contact region 2Dc with the semiconductor substrate 2 is formed on the lower surface 2D of the semiconductor substrate 2. Therefore, one electrode constituted by the semiconductor substrate 2 can be constituted by using a surface 2D different from the other first unit electrode 41, second unit electrode 42, and third unit electrode 43.
- the first capacitor C1 is formed between the first unit electrode 41 and the second unit electrode 42
- the second capacitor C2 is formed between the second unit electrode 42 and the third unit electrode 43. That is, the first capacitor C1 and the second capacitor C2 function as X capacitors connected to the power supply line.
- the first unit electrode 41, the second unit electrode 42, and the third unit electrode 43 are deepened, or the parallel number of the first unit electrode 41, the second unit electrode 42, and the third unit electrode 43 is increased. Etc. can be controlled. Accordingly, the capacitances of the first capacitor C1 and the second capacitor C2 can be increased in accordance with the control of the depth and the number of parallel units of the first unit electrode 41, the second unit electrode 42, and the third unit electrode 43.
- a third capacitor C3 is formed between the first unit electrode 41 and the semiconductor substrate 2, and a fourth capacitor C4 is formed between the second unit electrode 42 and the semiconductor substrate 2.
- a fifth capacitor C ⁇ b> 5 is formed between the electrode 43 and the semiconductor substrate 2. That is, the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 function as Y capacitors connected to the power supply line and the housing ground. Accordingly, the bottoms of the first trench T1, the second trench T2, and the third trench T3 function as the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5. Therefore, although the capacitances of the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 are small, the leakage current can be suppressed accordingly.
- the semiconductor capacitor in the first embodiment is applied to a horizontal capacitor, but the semiconductor capacitor in the third embodiment is applied to an XY capacitor. Since other operations are the same as those in the first and second embodiments, the description thereof is omitted.
- Example 4 is an example in which each terminal electrode is arranged as two electrode groups.
- FIG. 10 shows a planar structure of a semiconductor capacitor in the fourth embodiment.
- the configuration of the semiconductor capacitor according to the fourth embodiment will be described by being divided into “overall configuration” and “arrangement configuration”.
- the manufacturing method of the semiconductor capacitor” in the fourth embodiment is the same as that in the second embodiment, the description thereof is omitted.
- the semiconductor capacitor 1D includes a semiconductor substrate 2 (for example, silicon), an insulator 3 (for example, silicon oxide), an electrode group 4 (for example, polycrystalline silicon), and a terminal electrode (not shown).
- a semiconductor substrate 2 for example, silicon
- an insulator 3 for example, silicon oxide
- an electrode group 4 for example, polycrystalline silicon
- a terminal electrode not shown
- the semiconductor substrate 2 becomes one unit electrode in the electrode group.
- a first trench T1 (groove) and a second trench T2 (groove) are formed on the upper surface 2U (front surface) of the semiconductor substrate 2.
- the first trench T1 and the second trench T2 have a rectangular outer shape in plan view.
- a first unit electrode 41 is formed in the first trench T1.
- a second unit electrode 42 is formed in the second trench T2.
- a contact region (not shown) for obtaining electrical continuity with the semiconductor substrate 2 is formed on a lower surface (not shown) different from the upper surface 2U on which the first unit electrode 41 and the second unit electrode 42 are formed in the semiconductor substrate 2. Is done.
- the insulator 3 includes a region 3A.
- the region 3 ⁇ / b> A is a region sandwiched between the first unit electrode 41 and the second unit electrode 42. That is, the region 3A is a region where the first unit electrode 41 and the second unit electrode 42 face each other.
- the region 3A becomes a dielectric of the first capacitor C1.
- the first capacitor C1 is set so that at least one of tolerance and conductance is different in relation to a second capacitor C2 (not shown) and a third capacitor C3 (not shown) described later.
- the electrode group 4 consists of two electrode groups.
- One electrode group includes a plurality of first unit electrodes 41.
- the other electrode group includes a plurality of second unit electrodes 42.
- the first unit electrode 41 and the second unit electrode 42 have a rectangular outer shape in plan view.
- the first unit electrode 41 has a trench electrode structure embedded in the first trench T1.
- the second unit electrode 42 has a trench electrode structure embedded in the second trench T2. Since other configurations are the same as those of the second embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted.
- the first trench T1 and the second trench T2 are aligned and arranged in a lattice shape in the XY direction with a constant thickness W3.
- the first trench T1 and the second trench T2 are arranged in four rows in the XY direction.
- the first trenches T1 and the second trenches T2 are arranged in a staggered manner adjacent to each other in the XY direction.
- the first unit electrode 41 and the second unit electrode 42 are aligned and arranged in a lattice shape in the XY direction with a constant thickness W5.
- the first unit electrode 41 and the second unit electrode 42 are arranged in four rows in the XY direction.
- the first unit electrodes 41 and the second unit electrodes 42 are arranged in a staggered pattern alternately adjacent to the XY direction.
- a region 3A is formed between the first unit electrode 41 and the second unit electrode 42.
- a first capacitor C1 is formed in the region 3A.
- the first capacitor C1 functions as an X capacitor connected to the power supply line.
- the first capacitors C1 are arranged in 7 rows in the XY direction.
- the first capacitors C1 are arranged in a staggered pattern alternately adjacent to the XY direction. Each first capacitor C1 is connected in parallel.
- a plurality of second capacitors C ⁇ b> 2 are formed between the plurality of first unit electrodes 41 and the semiconductor substrate 2.
- a plurality of third capacitors C3 are formed between the plurality of second unit electrodes 42 and the semiconductor substrate 2.
- the plurality of second capacitors C2 (not shown) and the plurality of third capacitors C3 (not shown) function as Y capacitors connected to the power supply line and the housing ground.
- the thickness of the region 3A of the insulator 3 in the XY direction is W5.
- the thickness W5 of the region 3A is proportional to the breakdown voltage of the first capacitor C1.
- the electrode group 4 includes an electrode group including a plurality of first unit electrodes 41 and an electrode group including a plurality of second unit electrodes 42. That is, the first unit electrodes 41 and the second unit electrodes 42 are alternately arranged in a staggered manner. Thereby, a plurality of first capacitors C ⁇ b> 1 are formed between the plurality of first unit electrodes 41 and the plurality of second unit electrodes 42. That is, the first capacitors C1 are connected in parallel. Accordingly, it is possible to increase the capacitor capacitance between the first unit electrode 41 and the second unit electrode 42. Since other operations are the same as those in the first and second embodiments, the description thereof is omitted.
- Example 5 is an example in which a contact region is formed on the same surface as a surface on which a unit electrode is formed in a semiconductor substrate.
- Example 5 shows the planar structure of the semiconductor capacitor in Example 5
- FIG. 12 shows the internal structure.
- the configuration of the semiconductor capacitor in the fifth embodiment will be described by dividing it into an “overall configuration” and an “arrangement configuration”.
- the manufacturing method of the semiconductor capacitor” in the fifth embodiment is the same as that in the second embodiment, the description thereof is omitted.
- the semiconductor capacitor 1E includes a semiconductor substrate 2 (for example, silicon), an insulator 3 (for example, silicon oxide), an electrode group 4 (for example, polycrystalline silicon), and a terminal electrode. 5 (for example, aluminum).
- the semiconductor capacitor 1E has a horizontal capacitor structure.
- the semiconductor substrate 2 becomes one unit electrode in the electrode group as shown in FIG.
- a first trench T1 (groove) and a second trench T2 (groove) are formed on the upper surface 2U (front surface) of the semiconductor substrate 2.
- a first unit electrode 41 is formed in the first trench T1.
- a second unit electrode 42 is formed in the second trench T2.
- the contact region 2Uc is indicated by a bold line.
- the insulator 3 includes a first insulator 31, a second insulator 32, and a third insulator 33, as shown in FIGS.
- the first insulator 31 is sandwiched between the first unit electrode 41 and the second unit electrode 42.
- the first insulator 31 becomes a dielectric of the first capacitor C1.
- the second insulator 32 is sandwiched between the first unit electrode 41 and the semiconductor substrate 2.
- the second insulator 32 becomes a dielectric of the second capacitor C2.
- the third insulator 33 is sandwiched between the second unit electrode 42 and the semiconductor substrate 2.
- the third insulator 33 becomes a dielectric of the third capacitor C3.
- the first capacitor C1, the second capacitor C2, and the third capacitor C3 are set so that at least one of tolerance and conductance is different.
- the electrode group 4 includes a first unit electrode 41 and a second unit electrode 42 as shown in FIGS. 11 and 12. As shown in FIG. 12, the first unit electrode 41 has a trench electrode structure embedded in the first trench T1. As shown in FIG. 12, the second unit electrode 42 has a trench electrode structure embedded in the second trench T2.
- the terminal electrode 5 is formed on the upper surface 2U of the semiconductor substrate 2 via the contact region 2Uc as shown in FIG.
- a first capacitor C1 is disposed between the first unit electrode 41 and the second unit electrode.
- a second capacitor C2 is disposed between the first unit electrode 41 and the semiconductor substrate 2 as shown in FIG.
- a third capacitor C3 is disposed between the second unit electrode 42 and the semiconductor substrate 2 as shown in FIG.
- the thickness of the first insulator 31 is W6 as shown in FIG.
- the thickness of the second insulator 32 and the third insulator 33 is W7 as shown in FIG.
- the thickness W6 of the first insulator 31 is larger than the thickness W7 of the second insulator 32 and the third insulator 33 (W7 ⁇ W6).
- the thicknesses of the first insulator 31, the second insulator 32, and the third insulator 33 are proportional to the withstand voltages of the first capacitor C1, the second capacitor C2, and the third capacitor C3. That is, as shown in FIG. 11, the first capacitor C1 has a voltage that can be applied for a specified time without causing an insulation breakage compared to the second capacitor C2 and the third capacitor C3.
- the contact region 2Uc for obtaining electrical continuity with the semiconductor substrate 2 is formed on the same surface as the surface 2U on the semiconductor substrate 2 on which the first unit electrode 41 and the second unit electrode 42 are formed. . That is, the contact region 2Uc is provided on the same surface as the surface 2U on which the first unit electrode 41 and the second unit electrode 42 are formed.
- the semiconductor substrate 2 as an electrode and the first unit electrode 41 and the second unit electrode 42 other than the semiconductor substrate 2 can be connected on the upper surface 2U side of the semiconductor substrate 2. Therefore, electrical connection with the first unit electrode 41 and the second unit electrode 42 and electrical connection with the semiconductor substrate 2 can be performed on the same surface 2U of the semiconductor substrate 2. Since other operations are the same as those in the first and second embodiments, the description thereof is omitted.
- the contact region for obtaining electrical continuity with the semiconductor substrate is a surface on which the unit electrodes (first unit electrode 41 and second unit electrode 42) are formed in the semiconductor substrate (semiconductor substrate 2). It is formed on the same surface as (surface 2U). Therefore, the electrical connection between the unit electrodes (the first unit electrode 41 and the second unit electrode 42) and the electrical connection with the semiconductor substrate (semiconductor substrate 2) are the same surface (surface) of the semiconductor substrate (semiconductor substrate 2). 2U).
- Example 6 is an example in which a contact region is formed in a region surrounded by unit electrodes.
- FIG. 13 shows a planar structure of a semiconductor capacitor in Example 6, and FIG. 14 shows an arrangement structure.
- FIGS. 13 and 14 the configuration of the semiconductor capacitor according to the sixth embodiment will be described by dividing it into an “overall configuration” and an “arrangement configuration”.
- the “semiconductor capacitor manufacturing method” in the sixth embodiment is the same as that in the second embodiment, and thus the description thereof is omitted.
- the semiconductor capacitor 1F includes a semiconductor substrate 2 (for example, silicon), an insulator 3 (for example, silicon oxide), and an electrode group 4 (for example, polycrystalline silicon).
- the semiconductor capacitor 1F has a horizontal capacitor structure.
- the semiconductor substrate 2 becomes one unit electrode in the electrode group as shown in FIG.
- a first trench T1 (groove) and a second trench T2 (groove) are formed on the upper surface 2U (front surface) of the semiconductor substrate 2.
- the first trench T1 and the second trench T2 have a rectangular outer shape in plan view.
- the first unit electrode 41 is formed in the first trench T1.
- the second unit electrode 42 is formed in the second trench T2.
- the insulator 3 includes a region 3A and a region 3B.
- the region 3A is a region sandwiched between the first trench T1 and the second trench T2. That is, the region 3A is a region where the first trench T1 and the second trench T2 face each other as shown in FIGS.
- the region 3A serves as a dielectric of the first capacitor C1.
- the region 3B is a region surrounded by the first trench T1 and the second trench T2. That is, the region 3B is a region where the first trench T1 and the second trench T2 do not face each other, as shown in FIGS.
- the first capacitor C1 is set so that at least one of tolerance and conductance is different in relation to a second capacitor C2 (not shown) and a third capacitor C3 (not shown) described later.
- the electrode group 4 is composed of two electrode groups as shown in FIG.
- One electrode group includes a plurality of first unit electrodes 41 as shown in FIG.
- the other electrode group is composed of a plurality of second unit electrodes 42 as shown in FIG.
- the first unit electrode 41 and the second unit electrode 42 have a rectangular outer shape in plan view.
- the first unit electrode 41 has a trench electrode structure embedded in the first trench T1.
- the second unit electrode 42 has a trench electrode structure embedded in the second trench T2.
- the first trench T1 and the second trench T2 are aligned and arranged in a lattice shape in the XY direction with a constant thickness W8.
- the first trench T1 and the second trench T2 are arranged in four rows in the XY direction.
- the first trenches T1 and the second trenches T2 are arranged in a staggered manner alternately adjacent to the XY direction.
- the first unit electrode 41 and the second unit electrode 42 are aligned and arranged in a lattice shape in the XY direction with a constant thickness W8.
- FIG. 13 the first unit electrode 41 and the second unit electrode 42 are aligned and arranged in a lattice shape in the XY direction with a constant thickness W8.
- the first unit electrode 41 and the second unit electrode 42 are arranged in four rows in the XY direction. As shown in FIG. 13, the first unit electrodes 41 and the second unit electrodes 42 are arranged in a staggered manner adjacent to each other in the XY direction.
- the first capacitor C1 is arranged.
- the first capacitor C1 functions as an X capacitor connected to the power supply line.
- the first capacitors C1 are arranged in 7 rows in the XY direction.
- the first capacitors C ⁇ b> 1 are arranged in a staggered pattern alternately adjacent to the XY direction.
- Each first capacitor C1 is connected in parallel as shown in FIG.
- a plurality of second capacitors C ⁇ b> 2 are formed between the plurality of first unit electrodes 41 and the semiconductor substrate 2.
- a plurality of third capacitors C3 are formed between the plurality of second unit electrodes 42 and the semiconductor substrate 2.
- the plurality of second capacitors C2 (not shown) and the plurality of third capacitors C3 (not shown) function as Y capacitors connected to the power supply line and the housing ground.
- the thickness in the XY direction of the region 3A of the insulator 3 is W8 as shown in FIG.
- W8 the oxide film thickness between the first trench T1 and the second trench T2
- the oxide film formed by thermal oxidation is between the trenches before oxidation. If the thickness is twice, the thickness between the original trenches should be set to 0.5 microns.
- the thickness W8 of the region 3A is proportional to the withstand voltage of the capacitor C1.
- the set of first trenches T1 and the set of second trenches T2 are arranged in a staggered manner in the XY direction.
- the region 3B of the insulator 3 is surrounded by a set of first trenches T1 and a set of second trenches T2.
- a part of the region 3B is not oxidized. That is, a part of the region 3B remains as a contact region 2Uc of the semiconductor substrate 2 as shown in FIG.
- the region 3 ⁇ / b> B is disposed on the diagonal line D at a position where the pair of first trenches T ⁇ b> 1 face each other. As illustrated in FIG. 14, the region 3 ⁇ / b> B is disposed on the diagonal line D at a position where the pair of second trenches T ⁇ b> 2 face each other.
- the length of the diagonal line D in the region 3B is inversely proportional to the capacitance of the capacitor formed in the region 3B, as shown in FIG.
- the thickness W8 of the region 3A is inversely proportional to the capacitance of the capacitor formed in the region 3A. As shown in FIG. 14, the diagonal line D is longer than the thickness W8 (D> W8).
- diagonal line D refers to a line segment indicated by a broken line connecting opposite corners of a pair of first trenches T1 and T2, as shown in FIG.
- Example 6 the contact region 2Uc is formed in the region 3B surrounded by the first unit electrode 41 and the second unit electrode. That is, the contact region 2Uc is formed in the region 3B where the first unit electrode 41 and the second unit electrode 42 do not face each other. Therefore, the contact region 2Uc is formed in the region 3B where the capacitance of the capacitor is smaller than the region 3A where the first unit electrode 41 and the second unit electrode 42 face each other. That is, the contact region 2Uc is formed in the region 3B where the capacitor does not function effectively compared to the region 3A. The first unit electrode 41 and the second unit electrode 42 do not exist in this region 3B.
- the area on the upper surface 2U of the semiconductor substrate 2 can be effectively used as compared with the case where the contact region 2Uc is formed in a region different from the region 3B on the upper surface 2U of the semiconductor substrate 2. Accordingly, it is possible to form the contact region 2Uc with the semiconductor substrate 2 without sacrificing the capacitance of the semiconductor capacitor 1F.
- action is the same as that of Example 1, Example 2, and Example 5, description is abbreviate
- the contact region (contact region 2Uc) is formed in a region (region 3B) surrounded by the unit electrodes (first unit electrode 41 and second unit electrode 42). Therefore, it is possible to form a contact region (contact region 2Uc) with the semiconductor substrate (semiconductor substrate 2) without sacrificing the capacitance of the semiconductor capacitor (semiconductor capacitor 1F).
- the semiconductor capacitor of the present invention has been described based on the first to sixth embodiments.
- the specific configuration is not limited to these embodiments, and the claims relate to each claim. Design changes and additions are allowed without departing from the scope of the invention.
- Example 2 shows an example in which the semiconductor capacitor 1B is manufactured by performing the trench formation process (FIGS. 5 and 6), the insulating film formation process (FIG. 7), and the electrode group formation process (FIG. 8) in this order.
- the time of the thermal oxidation process in the insulating film forming process may be longer than that in the insulating film forming process (FIG. 7).
- the trench formation process is the same as in FIGS. 5 and 6 and is not shown.
- the insulator formation process first, there is a thermal oxidation process in which the semiconductor substrate 2 cleaned in the substrate cleaning process is put in an oxidation furnace and heat is applied in oxygen, but the illustration is omitted.
- the time of this thermal oxidation process is set longer than the time of the thermal oxidation process included in the insulating film formation process (FIG. 7).
- the upper surface 2 ⁇ / b> U of the semiconductor substrate 2 is exposed by an insulator removing process for removing a part of the insulator 3.
- an insulator formation process is completed.
- the electrode group forming process as shown in FIG. 16, the first unit electrode 41 and the second unit electrode 42 similar to those in FIG. 8 are formed in each trench T.
- the upper surface 2 ⁇ / b> U of the semiconductor substrate 2 is exposed by an electrode material removing process for removing a part of the electrode material.
- the oxide film thickness FT2 of the insulator 3 formed at the bottom of the trench T is made thicker than the oxide film thickness FT1 (FIG. 7) (FT2> FT1). Accordingly, it is possible to increase the withstand voltage of the capacitor formed between the semiconductor substrate 2 and each trench T, and to suppress the leakage current between the semiconductor substrate 2 and each trench T.
- Example 2 shows an example in which the semiconductor substrate 2 is put in an oxidation furnace (not shown) and an insulating film is formed on the semiconductor substrate by thermal oxidation treatment in which heat is applied in oxygen.
- an insulating film may be formed on the semiconductor substrate using a CVD method.
- Example 2 Example 3 and Example 5 show examples in which the terminal electrode 5 is aluminum. However, it is not limited to this.
- the terminal electrode 5 may be Ti (titanium) / Ni (nickel) / Ag (silver).
- Examples 2 to 6 show examples in which the semiconductor capacitor of the present invention is applied to an XY capacitor used for suppressing electromagnetic noise.
- the semiconductor capacitor of the present invention is used for an inverter capacitor (for example, a smoothing capacitor) mounted on a vehicle such as an electric vehicle or a hybrid vehicle, or an industrial application other than a vehicle (for example, a ship). It can also be applied to a capacitor.
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Abstract
Description
実施例1における半導体コンデンサは、複数の横型コンデンサが形成された半導体コンデンサに適用したものである。図1は実施例1における半導体コンデンサの平面構造を示し、図2は内部構造を示す。以下、図1及び図2に基づいて、実施例1における半導体コンデンサの構成を、「全体構成」と、「配置構成」に分けて説明する。以下では、説明の便宜上、XYZ直交座標系を参照しつつ各部材の位置関係を説明する。詳細には、半導体コンデンサの幅方向をX軸方向(+X方向)とする。また、X軸方向に直交して、半導体コンデンサの前後方向をY軸方向(+Y方向)、X軸方向及びY軸方向に直交し、半導体コンデンサの高さ方向をZ軸方向(+Z方向)とする。なお、+X方向を右方向(-X方向を左方向)、+Y方向を前方向(-Y方向を後方向)、+Z方向を上方向(-Z方向を下方向)として、適宜使用する。
ここで、「横型コンデンサ」とは、基板の片面(例えば、上面)に端子電極を有する構成のコンデンサを意味する。
半導体コンデンサ1Aは、図1に示すように、半導体基板2A(例えば、酸化シリコン)と、絶縁物2B(例えば、酸化シリコン)と、電極群4(例えば、多結晶シリコン)と、を備える。半導体コンデンサ1Aは、トレンチ形成処理、絶縁膜形成処理及び電極群形成処理の順で実施することによって製造される。絶縁膜形成処理では、基板材料(例えば、シリコン)が酸化される。なお、図1中の二点鎖線は、半導体基板2Aと絶縁物2Bとの境界を示す。
ここで、「耐性」とは、コンデンサが規定の電圧に耐える能力のことをいい、耐圧や絶縁抵抗の概念を含む。「耐圧」とは、コンデンサが絶縁破損を起こさずに規定時間印加できる電圧のことをいい、誘電体となる絶縁物の厚みと比例関係にある。「絶縁抵抗」とは、絶縁された回路または導体間の電気抵抗値のことをいう。「コンダクタンス」とは、コンデンサにおけるリーク電流の流れ易さのことをいい、電極群を構成する単位電極の表面積等に比例する。
第1単位電極41と第2単位電極42との間には、図1及び図2に示すように、第1コンデンサC1が配置される。第2単位電極42と第3単位電極43との間には、図1及び図2に示すように、第2コンデンサC2が配置される。第1単位電極41と第3単位電極43との間には、図1及び図2に示すように、第3コンデンサC3が配置される。
例えば、半導体を利用したコンデンサの従来の技術としては、トレンチ電極間で横型の半導体コンデンサの構造をなすものが知られている。この半導体コンデンサの製造方法では、半導体基板の一主面にトレンチが形成される。続いて、そのトレンチ内に絶縁膜としての酸化膜が形成される。続いて、トレンチに電極材で埋め込んで形成した電極が、半導体基板の表面に形成される。続いて、隣り合うトレンチ電極間に誘電体としての酸化膜が形成される。
即ち、耐性とコンダクタンスの少なくとも一方が異なる第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3が、半導体基板2Aに設けられる。このため、絶縁破損を起こさずに規定時間印加できる電圧や、リーク電流の流れ易さが、第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3毎に異なる。これにより、半導体コンデンサ1Aに求められる要求に応じて、第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3を使い分けることができる。
その結果、半導体基板2からなるコンデンサ回路で多様な要求に対応できる。
加えて、半導体コンデンサ1Aは、半導体基板2Aと、半導体基板2Aに形成された電極群4を有し、電極群4それぞれの間は絶縁物2Bで挟まれた構造である。このため、第1単位電極41、第2単位電極42及び第3単位電極43の間が、第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3の接続点となる。これにより、半導体コンデンサ1Aは、3端子コンデンサとなる。つまり、半導体コンデンサ1Aの端子数を従来の2端子よりも多い3端子に増やすことができる。従って、半導体基板上に、第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3を接続したコンデンサ回路を形成することができ、コンデンサ部品の小型化、軽量化、低コスト化に寄与できる。
即ち、半導体基板2Aの上面2Auに、隣り合うトレンチ状の第1単位電極41、第2単位電極42及び第3単位電極43が形成される。このため、隣り合うトレンチ状の第1単位電極41、第2単位電極42及び第3単位電極43の間に、第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3を構成できる。これにより、第1トレンチT1、第2トレンチT2及び第3トレンチT3を深く、且つ、トレンチ構造を微細化できる。
従って、第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3の静電容量を従来よりも増大できる。
即ち、第1単位電極41、第2単位電極42及び第3単位電極43間の厚みWに比例して、第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3の耐圧が増加する。このため、第1絶縁物2B1、第2絶縁物2B2及び第3絶縁物2B3の厚みWに比例して、第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3の耐圧が増加する。これにより、第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3に必要な耐圧を実現するために、第1トレンチT1、第2トレンチT2及び第3トレンチT3の厚みを設定できる。
従って、第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3に必要な耐圧を、第1トレンチT1、第2トレンチT2及び第3トレンチT3の厚みによって制御できる。
実施例1における半導体コンデンサ1Aにあっては、下記に列挙する効果が得られる。
複数のコンデンサ(第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3)は、コンデンサが規定の電圧に耐える能力である耐性と、コンデンサにおけるリーク電流の流れ易さであるコンダクタンスとのうち、少なくとも一方が異なる設定とされる(図1及び図2)。
このため、半導体基板2からなる回路(第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3)で多様な要求に対応できる半導体コンデンサ(半導体コンデンサ1A)を提供することができる。
このため、(1)の効果に加え、コンデンサ(第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3)の静電容量を従来よりも増大できる。
このため、(1)又は(2)の効果に加え、必要なコンデンサ(第1コンデンサC1、第2コンデンサC2及び第3コンデンサC3)の耐圧を、溝(第1トレンチT1、第2トレンチT2及び第3トレンチT3)間の厚みによって制御できる。
実施例2における半導体コンデンサは、XYコンデンサに適用したものである。以下、実施例2における半導体コンデンサの構成を、「全体構成」と、「配置構成」と、「回路構成」と、「半導体コンデンサの製造方法」に分けて説明する。
ここで、「XYコンデンサ」とは、XコンデンサとYコンデンサとの組み合わせにより構成され、電磁ノイズの抑制に用いられる。「電磁ノイズ」には、伝導の方法(モード)により二種類のノイズに分けられ、ノーマルモードノイズ及びコモンモードノイズがある。「ノーマルモードノイズ」とは、電源ライン間に発生する電磁ノイズのことをいう。「コモンモードノイズ」とは、電源ラインと筐体グランド間に発生する電磁ノイズのことをいう。「筐体グランド」とは、グランドに接続されたものであり、例えば、半導体基板によって提供されるものをいう。
図3は実施例2における半導体コンデンサの内部構造を示す。以下、図3に基づいて、実施例2における半導体コンデンサの全体構成を説明する。
ここで、「コンタクト領域」とは、端子電極5と半導体基板2とが接続される部位のことをいう。
以下、図3に基づいて、配置構成を説明する。
図4は実施例2における半導体コンデンサの回路構成を示す。以下、図4に基づいて、回路構成を説明する。実施例1の半導体コンデンサはXコンデンサを備えていたが、実施例2における半導体コンデンサは、Xコンデンサ及びYコンデンサを備える。
ここで、「Xコンデンサ」とは、電源ライン間に接続されたコンデンサであり、電源ラインの電圧変動を抑制する等の効果を大きくするためには静電容量が大きい方が良い。「Yコンデンサ」とは、各電源ラインと筐体グランドとの間にコンデンサが接続された構成で、コモンモードノイズ抑制に用いられる。「Yコンデンサ」は、各電源ラインと筐体グランドとの間に接続されることから、安全上リーク電流が抑制される必要がある。
図5~図8は実施例2における半導体コンデンサの製造方法を示す。以下、図5~図8に基づいて、実施例2における半導体コンデンサの製造方法を説明する。実施例2では、トレンチ形成処理(図5及び図6)、絶縁膜形成処理(図7)及び電極群形成処理(図8)の順で実施し、半導体コンデンサ1Bを製造する。
トレンチ形成処理では、まず、図5に示すように、半導体基板2を用意する。続いて、CVD法により半導体基板2に酸化膜を堆積する酸化膜堆積工程があるが、図示を省略する。続いて、酸化膜にレジストを塗布するレジスト塗布工程があるが、図示を省略する。続いて、マスクを介してレジストを露光する露光工程があるが、図示を省略する。続いて、レジストの露光部を除去する露光部除去工程があるが、図示を省略する。続いて、酸化膜をエッチングする酸化膜エッチング工程があるが、図示を省略する。続いて、レジストを酸化膜から剥離するレジスト剥離工程があるが、図示を省略する。続いて、レジスト剥離工程にてレジストが剥離された酸化膜(不図示)をマスクとして、図6に示すように、異方性エッチングによって2つのトレンチTを形成する。続いて、レジスト剥離工程にてレジストが剥離された酸化膜(不図示)を除去する酸化膜除去工程があるが、図示を省略する。これにより、トレンチ形成処理が完了する。
絶縁物形成処理では、まず、基板洗浄工程にて洗浄された半導体基板2を酸化炉に入れて、酸素中で熱を掛ける熱酸化工程があるが、図示を省略する。この熱酸化工程により、半導体基板2に絶縁物3が形成される。続いて、図7に示すように、絶縁物3の一部を除去する絶縁物除去工程により、半導体基板2の上面2Uを露出させる。これにより、絶縁物形成処理が完了する。
なお、図7中の酸化膜厚FT1は、トレンチTの底部に形成された絶縁物3の酸化膜厚を示す。
電極群形成処理では、まず、絶縁物除去工程にて絶縁物3の一部が除去された半導体基板2の上面2Uに、CVD法を用いて電極材を堆積する電極材堆積工程があるが、図示を省略する。この電極材堆積工程により、2つのトレンチTが電極材で埋まる。これにより、図8に示すように、各トレンチTに第1単位電極41及び第2単位電極42が形成される。続いて、図8に示すように、電極材の一部を除去する電極材除去工程により、半導体基板2の上面2Uを露出させる。これにより、電極群形成処理が完了する。
実施例2では、電極群のうち1つの単位電極は、半導体基板2である。
即ち、半導体基板2が、1つの単位電極となる。このため、半導体基板2が、第2コンデンサC2及び第3コンデンサC3の1電極として用いられる。特に、半導体基板2が比較的低い抵抗を有する基板の場合は、半導体基板2を接続点としてコンデンサ回路を構成できる。これにより、第1単位電極41と半導体基板2との間に第2コンデンサC2を構成できると共に、第2単位電極42と半導体基板2との間にも第3コンデンサC3を構成できる。
従って、第1単位電極41及び第2単位電極42の間以外に、第1単位電極41及び第2単位電極42と半導体基板2との間もコンデンサとして機能させることが可能となる。
即ち、半導体基板2とのコンタクト領域は、半導体基板2の下面2Dに形成される。
従って、半導体基板2で構成される1つの電極を、他の第1単位電極41及び第2単位電極42と異なる面2Dを用いて構成できる。
即ち、第1コンデンサC1は、Xコンデンサとして機能する。これにより、第1単位電極41及び第2単位電極42を深くしたり、第1単位電極41及び第2単位電極42の並列数を多くしたりする等の制御が可能である。
従って、第1コンデンサC1の静電容量を、第1単位電極41及び第2単位電極42の深さや並列数等の制御に応じて大きくできる。
即ち、第2コンデンサC2及び第3コンデンサC3は、Yコンデンサとして機能する。これにより、第1トレンチT1及び第2トレンチT2の底部が第2コンデンサC2及び第3コンデンサC3として働く。
従って、第2コンデンサC2及び第3コンデンサC3の静電容量としては小さいが、その分リーク電流を抑制することができる。
なお、他の作用は、実施例1と同様であるので、説明を省略する。
実施例2における半導体コンデンサ1Bにあっては、上記(1)~(3)の効果に加え、下記の効果が得られる。
このため、単位電極(第1単位電極41及び第2単位電極42)間以外に、単位電極(第1単位電極41及び第2単位電極42)と半導体基板(半導体基板2)との間もコンデンサ(第2コンデンサC2及び第3コンデンサC3)として機能させることが可能となる。
このため、半導体基板(半導体基板2)で構成される1つの電極を、他の単位電極(第1単位電極41及び第2単位電極42)と異なる面(面2D)を用いて構成できる。
実施例3における半導体コンデンサは、実施例2と同様に、XYコンデンサに適用したものである。図9は実施例3における半導体コンデンサの内部構造を示す。以下、図9に基づいて、実施例3における半導体コンデンサの構成を、「全体構成」と、「配置構成」に分けて説明する。なお、実施例3における「半導体コンデンサの製造方法」については、実施例2と同様であるので説明を省略する。
半導体コンデンサ1Cは、半導体基板2(例えば、シリコン)と、絶縁物3(例えば、酸化シリコン)と、電極群4(例えば、多結晶シリコン)と、端子電極5(例えば、アルミニウム)と、を備える。
他の構成は、実施例2と同様であるので、対応する構成に同一符号を付して説明を省略する。
第1単位電極41と第2単位電極42との間には、第1コンデンサC1が配置される。第2単位電極42と第3単位電極43との間には、第2コンデンサC2が配置される。第1単位電極41と半導体基板2との間には、第3コンデンサC3が配置される。第2単位電極42と半導体基板2との間には、第4コンデンサC4が配置される。第3単位電極43と半導体基板2との間には、第5コンデンサC5が配置される。
実施例3では、電極群のうち1つの単位電極は、半導体基板2である。
即ち、半導体基板2が、1つの単位電極となる。このため、半導体基板2が、第3コンデンサC3、第4コンデンサC4及び第5コンデンサC5の1電極として用いられる。特に、半導体基板2が比較的低い抵抗を有する基板の場合は、半導体基板2を接続点としてコンデンサ回路を構成できる。これにより、第1単位電極41と半導体基板2との間に第3コンデンサC3を構成でき、第2単位電極42と半導体基板2との間に第4コンデンサC4を構成できると共に、第3単位電極43と半導体基板2との間にも第5コンデンサC5を構成できる。
従って、第1単位電極41、第2単位電極42及び第3単位電極43間以外に、第1単位電極41、第2単位電極42及び第3単位電極43と半導体基板2との間も第3コンデンサC3、第4コンデンサC4及び第5コンデンサC5として機能させることが可能となる。
加えて、単位電極を2つから3つに増やすことで、半導体コンデンサ1Cに配置されるコンデンサの数を3つから5つに増やすことができる。従って、単位電極を2つ設ける場合と比べて、半導体コンデンサ1C全体としての容量を増やすことができる。
即ち、半導体基板2とのコンタクト領域2Dcは、半導体基板2の下面2Dに形成される。
従って、半導体基板2で構成される1つの電極を、他の第1単位電極41、第2単位電極42及び第3単位電極43と異なる面2Dを用いて構成できる。
即ち、第1コンデンサC1及び第2コンデンサC2は、電源ラインに接続されたXコンデンサとして機能する。これにより、第1単位電極41、第2単位電極42及び第3単位電極43を深くしたり、第1単位電極41、第2単位電極42及び第3単位電極43の並列数を多くしたりする等の制御が可能である。
従って、第1コンデンサC1及び第2コンデンサC2の静電容量を、第1単位電極41、第2単位電極42及び第3単位電極43の深さや並列数等の制御に応じて大きくできる。
即ち、第3コンデンサC3、第4コンデンサC4及び第5コンデンサC5は、電源ラインと筐体グランドに接続されたYコンデンサとして機能する。これにより、第1トレンチT1、第2トレンチT2及び第3トレンチT3の底部が第3コンデンサC3、第4コンデンサC4及び第5コンデンサC5として働く。
従って、第3コンデンサC3、第4コンデンサC4及び第5コンデンサC5の静電容量としては小さいが、その分リーク電流を抑制することができる。
加えて、実施例1における半導体コンデンサは横型コンデンサに適用されていたが、実施例3における半導体コンデンサはXYコンデンサに適用される。
なお、他の作用は、実施例1及び実施例2と同様であるので、説明を省略する。
実施例3における半導体コンデンサ1Cにあっては、実施例1の(1)~(3)及び実施例2の(4),(5)と同様の効果を得ることができる。
実施例4における半導体コンデンサは、実施例2と同様に、XYコンデンサに適用したものである。図10は実施例4における半導体コンデンサの平面構造を示す。以下、図10に基づいて、実施例4における半導体コンデンサの構成を、「全体構成」と、「配置構成」に分けて説明する。なお、実施例4における「半導体コンデンサの製造方法」については、実施例2と同様であるので説明を省略する。
半導体コンデンサ1Dは、半導体基板2(例えば、シリコン)と、絶縁物3(例えば、酸化シリコン)と、電極群4(例えば、多結晶シリコン)と、端子電極(不図示)と、を備える。
他の構成は、実施例2と同様であるので、対応する構成に同一符号を付して説明を省略する。
第1トレンチT1及び第2トレンチT2はXY方向に格子状に一定厚みW3で整列配置される。第1トレンチT1及び第2トレンチT2は、XY方向に対して4列に並んで配置される。第1トレンチT1及び第2トレンチT2は、XY方向に対して交互に隣り合う千鳥状に配置される。第1単位電極41及び第2単位電極42は、XY方向に格子状に一定厚みW5で整列配置される。第1単位電極41及び第2単位電極42は、XY方向に対して4列に並んで配置される。第1単位電極41及び第2単位電極42は、XY方向に対して交互に隣り合う千鳥状に配置される。
実施例4では、電極群4は、複数の第1単位電極41からなる電極群と、複数の第2単位電極42からなる電極群と、を備える。
即ち、第1単位電極41及び第2単位電極42は、交互に隣り合う千鳥状に配置される。これにより、複数の第1単位電極41と、複数の第2単位電極42との間には、複数の第1コンデンサC1が形成される。つまり、各第1コンデンサC1は、並列に接続される。
従って、第1単位電極41と第2単位電極42との間のコンデンサ静電容量を増加させることが可能となる。
なお、他の作用は、実施例1及び実施例2と同様であるので、説明を省略する。
実施例4における半導体コンデンサ1Dにあっては、実施例1の(1)~(3)及び実施例2の(4),(5)と同様の効果を得ることができる。
実施例5における半導体コンデンサは、実施例2と同様に、XYコンデンサに適用したものである。図11は実施例5における半導体コンデンサの平面構造を示し、図12は内部構造を示す。以下、図11及び図12に基づいて、実施例5における半導体コンデンサの構成を、「全体構成」と、「配置構成」に分けて説明する。なお、実施例5における「半導体コンデンサの製造方法」については、実施例2と同様であるので説明を省略する。
半導体コンデンサ1Eは、図11及び図12に示すように、半導体基板2(例えば、シリコン)と、絶縁物3(例えば、酸化シリコン)と、電極群4(例えば、多結晶シリコン)と、端子電極5(例えば、アルミニウム)と、を備える。半導体コンデンサ1Eは、横型コンデンサの構造を有する。
第1単位電極41と第2単位電極42との間には、図12に示すように、第1コンデンサC1が配置される。第1単位電極41と半導体基板2との間には、図12に示すように、第2コンデンサC2が配置される。第2単位電極42と半導体基板2との間には、図12に示すように、第3コンデンサC3が配置される。
実施例5では、半導体基板2と電気的導通を得るためのコンタクト領域2Ucは、半導体基板2において第1単位電極41及び第2単位電極42が形成される面2Uと同一の面に形成される。
即ち、コンタクト領域2Ucは、第1単位電極41及び第2単位電極42が形成される面2Uと同一の面上に設けられる。これにより、電極としての半導体基板2と、半導体基板2以外の他の第1単位電極41及び第2単位電極42と、を半導体基板2の上面2U側で接続できる。
従って、第1単位電極41及び第2単位電極42との電気的接続や、半導体基板2との電気的接続を、半導体基板2の同じ面2Uで行うことが可能となる。
なお、他の作用は、実施例1及び実施例2と同様であるので、説明を省略する。
実施例5における半導体コンデンサ1Eにあっては、上記(1)~(4)の効果に加え、下記の効果が得られる。
このため、単位電極(第1単位電極41及び第2単位電極42)の電気的接続や、半導体基板(半導体基板2)との電気的接続を、半導体基板(半導体基板2)の同じ面(面2U)で行うことが可能となる。
実施例6における半導体コンデンサは、実施例2と同様に、XYコンデンサに適用したものである。図13は実施例6における半導体コンデンサの平面構造を示し、図14は配置構造を示す。以下、図13及び図14に基づいて、実施例6における半導体コンデンサの構成を、「全体構成」と、「配置構成」に分けて説明する。なお、実施例6における「半導体コンデンサの製造方法」については、実施例2と同様であるので説明を省略する。
半導体コンデンサ1Fは、図13に示すように、半導体基板2(例えば、シリコン)と、絶縁物3(例えば、酸化シリコン)と、電極群4(例えば、多結晶シリコン)と、を備える。半導体コンデンサ1Fは、横型コンデンサの構造を有する。
第1トレンチT1及び第2トレンチT2は、図13に示すように、XY方向に格子状に一定厚みW8で整列配置される。第1トレンチT1及び第2トレンチT2は、図13に示すように、XY方向に対して4列に並んで配置される。第1トレンチT1及び第2トレンチT2は、図13に示すように、XY方向に対して交互に隣り合う千鳥状に配置される。第1単位電極41及び第2単位電極42は、図13に示すように、XY方向に格子状に一定厚みW8で整列配置される。第1単位電極41及び第2単位電極42は、図13に示すように、XY方向に対して4列に並んで配置される。第1単位電極41及び第2単位電極42は、図13に示すように、XY方向に対して交互に隣り合う千鳥状に配置される。
ここで、「対角線D」とは、図14に示すように、一組の第1トレンチT1,T2の対向する角同士を結んだ破線で示す線分のことをいう。
実施例6では、コンタクト領域2Ucは、第1単位電極41と第2単位電極42に囲まれた領域3Bに形成される。
即ち、コンタクト領域2Ucは、第1単位電極41と第2単位電極42とが対向しない領域3Bに形成される。このため、第1単位電極41及び第2単位電極42が対向する領域3Aと比べて、コンデンサの静電容量が小さくなる領域3Bに、コンタクト領域2Ucが形成される。つまり、コンタクト領域2Ucは、領域3Aと比べてコンデンサが有効に機能しない領域3Bに形成される。この領域3Bには、第1単位電極41及び第2単位電極42が存在しない。よって、半導体基板2の上面2Uにおいて領域3Bとは別の領域にコンタクト領域2Ucを形成する場合と比べて、半導体基板2の上面2Uにおける面積を有効活用できる。
従って、半導体コンデンサ1Fの静電容量を犠牲にすることなく、半導体基板2とのコンタクト領域2Ucを形成することが可能となる。
なお、他の作用は、実施例1、実施例2及び実施例5と同様であるので、説明を省略する。
実施例6における半導体コンデンサ1Fにあっては、上記(1)~(4),(6)の効果に加え、下記の効果が得られる。
このため、半導体コンデンサ(半導体コンデンサ1F)の静電容量を犠牲にすることなく、半導体基板(半導体基板2)とのコンタクト領域(コンタクト領域2Uc)を形成することが可能となる。
T,T1,T2,T3 トレンチ
W1,W2,W3,W4,W5,W6,W7,W8 単位電極間の厚み
1A,1B,1C,1D,1E,1F 半導体コンデンサ
2,2A,2B 半導体基板
2D 下面
2U 上面
2Dc,2Uc コンタクト領域
3,31,32,33,34,35 絶縁物
3A 単位電極に挟まれた領域
3B 単位電極に囲まれた領域
4 電極群
41,42,43,44 第1~第4単位電極
Claims (7)
- 半導体基板と、前記半導体基板に形成された電極群と、絶縁物と、を備え、前記電極群それぞれの間に前記絶縁物が挟まれた構造を有する複数のコンデンサが形成された半導体コンデンサであって、
前記複数のコンデンサは、コンデンサが規定の電圧に耐える能力である耐性と、コンデンサにおけるリーク電流の流れ易さであるコンダクタンスとのうち、少なくとも一方が異なる設定とされる
ことを特徴とする半導体コンデンサ。 - 請求項1に記載の半導体コンデンサにおいて、
前記電極群を構成する各単位電極は、前記半導体基板の表面に形成された溝に埋め込まれたトレンチ電極の構造を有する、
ことを特徴とする半導体コンデンサ。 - 請求項1又は請求項2に記載の半導体コンデンサにおいて、
前記電極群のうち1つの単位電極は、前記半導体基板である、
ことを特徴とする半導体コンデンサ。 - 請求項3に記載の半導体コンデンサにおいて、
前記半導体基板と電気的導通を得るためのコンタクト領域は、前記半導体基板において前記単位電極が形成される面と同一の面に形成される
ことを特徴とする半導体コンデンサ。 - 請求項4に記載の半導体コンデンサにおいて、
前記コンタクト領域は、前記単位電極に囲まれた領域に形成される
ことを特徴とする半導体コンデンサ。 - 請求項3に記載の半導体コンデンサにおいて、
前記半導体基板と電気的導通を得るためのコンタクト領域は、前記半導体基板において前記単位電極が形成される面と異なる面に形成される
ことを特徴とする半導体コンデンサ。 - 請求項2から請求項6までの何れか一項に記載された半導体コンデンサにおいて、
前記単位電極間の厚みは、前記単位電極間に構成されるコンデンサの耐圧と比例関係にある
ことを特徴とする半導体コンデンサ。
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