WO2022202009A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
- Publication number
- WO2022202009A1 WO2022202009A1 PCT/JP2022/006617 JP2022006617W WO2022202009A1 WO 2022202009 A1 WO2022202009 A1 WO 2022202009A1 JP 2022006617 W JP2022006617 W JP 2022006617W WO 2022202009 A1 WO2022202009 A1 WO 2022202009A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- region
- trench
- dummy
- semiconductor device
- electrode
- Prior art date
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 149
- 238000002955 isolation Methods 0.000 claims abstract description 302
- 239000002344 surface layer Substances 0.000 claims abstract description 34
- 210000000746 body region Anatomy 0.000 claims description 64
- 239000012212 insulator Substances 0.000 claims description 25
- 239000012535 impurity Substances 0.000 claims description 17
- 238000005192 partition Methods 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 238000000638 solvent extraction Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 description 20
- 238000012986 modification Methods 0.000 description 20
- 239000011229 interlayer Substances 0.000 description 19
- 230000002093 peripheral effect Effects 0.000 description 13
- 239000010410 layer Substances 0.000 description 10
- 238000000926 separation method Methods 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 229910052814 silicon oxide Inorganic materials 0.000 description 9
- 230000015556 catabolic process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 4
- 229920005591 polysilicon Polymers 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 3
- 229910002601 GaN Inorganic materials 0.000 description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Images
Classifications
-
- 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
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7803—Vertical DMOS transistors, i.e. VDMOS transistors structurally associated with at least one other device
- H01L29/7804—Vertical DMOS transistors, i.e. VDMOS transistors structurally associated with at least one other device the other device being a pn-junction diode
- H01L29/7805—Vertical DMOS transistors, i.e. VDMOS transistors structurally associated with at least one other device the other device being a pn-junction diode in antiparallel, e.g. freewheel diode
-
- 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
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
-
- 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
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/0684—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by the shape, relative sizes or dispositions of the semiconductor regions or junctions between the regions
- H01L29/0692—Surface layout
- H01L29/0696—Surface layout of cellular field-effect devices, e.g. multicellular DMOS transistors or IGBTs
-
- 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
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/402—Field plates
- H01L29/407—Recessed field plates, e.g. trench field plates, buried field plates
-
- 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
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7811—Vertical DMOS transistors, i.e. VDMOS transistors with an edge termination structure
-
- 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
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41766—Source or drain electrodes for field effect devices with at least part of the source or drain electrode having contact below the semiconductor surface, e.g. the source or drain electrode formed at least partially in a groove or with inclusions of conductor inside the semiconductor
-
- 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
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42372—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out
- H01L29/4238—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out characterised by the surface lay-out
-
- 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
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/70—Bipolar devices
- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/739—Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field-effect, e.g. bipolar static induction transistors [BSIT]
- H01L29/7393—Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
- H01L29/7395—Vertical transistors, e.g. vertical IGBT
- H01L29/7396—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions
- H01L29/7397—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions and a gate structure lying on a slanted or vertical surface or formed in a groove, e.g. trench gate IGBT
Definitions
- Patent Document 1 discloses a semiconductor device having a semiconductor substrate, an n-type drift region, a p-type body region and a trench gate electrode.
- One embodiment provides a semiconductor device capable of improving electrical characteristics.
- a chip having a main surface, a first region of a first conductivity type formed in a surface layer portion of the main surface, and a second conductivity type second region formed in a surface layer portion of the first region. and a region penetrating through the second region, surrounding the inner side of the second region, and dividing the main surface into an inner region on the inner side of the second region and an outer region on the outer side of the second region.
- a trench gate structure formed in the inner region so as to penetrate the second region; an inner diode including the first region and the second region located in the inner region; and an outer diode electrically isolated from the trench gate structure and the inner diode by the trench isolation structure.
- One embodiment includes a chip having a main surface, a trench isolation structure formed on the main surface to extend in a first direction, and a trench isolation structure formed on the main surface to extend in a second direction intersecting the first direction.
- a trench gate structure partitioning the trench isolation structure and the mesa portion; a first body region formed in the surface layer portion of the main surface within the mesa portion; and a first body region formed in the surface layer portion of the main surface outside the mesa portion. and a second body region electrically isolated from the trench gate structure and the first body region by the trench isolation structure.
- FIG. 1 is a plan view showing the semiconductor device according to the first embodiment.
- FIG. 2 is a plan view showing the structure of the first main surface of the chip shown in FIG. 1.
- FIG. 3 is an enlarged view of region III shown in FIG.
- FIG. 4 is an enlarged view of area IV shown in FIG.
- FIG. 5 is a cross-sectional view taken along line V-V shown in FIG.
- FIG. FIG. 8 is a plan view corresponding to FIG. 2 and showing the structure of the first main surface of the chip of the semiconductor device according to the second embodiment.
- FIG. 9 is an enlarged view of region IX shown in FIG.
- FIG. 10 is a cross-sectional view taken along line X-X shown in FIG. 9.
- FIG. 11 is a cross-sectional view taken along line XI-XI shown in FIG. 9.
- FIG. 12 is a cross-sectional view taken along line XII-XII shown in FIG. 9.
- FIG. 13 is a cross-sectional view taken along line XIII-XIII shown in FIG. 9.
- FIG. 14 is a plan view corresponding to FIG. 2 and showing the structure of the first main surface of the chip of the semiconductor device according to the third embodiment.
- FIG. 15 is a sectional view corresponding to FIG. 5 and showing a modification of the second region applied to the first to third embodiments.
- FIG. 16 is a plan view corresponding to FIG.
- FIG. 17 is a cross-sectional view taken along line XVII-XVII shown in FIG. 16.
- FIG. FIG. 18 is a cross-sectional view corresponding to FIG. 5 and showing a second modification of the dummy trench structure applied to the first to third embodiments.
- FIG. 19 is a plan view corresponding to FIG. 3 and showing a modification of the device region applied to the first to third embodiments.
- FIG. 1 is a plan view showing a semiconductor device 1A according to the first embodiment.
- 2 is a plan view showing the structure of the first main surface 3 of the chip 2 shown in FIG. 1.
- FIG. 3 is an enlarged view of region III shown in FIG.
- FIG. 4 is an enlarged view of area IV shown in FIG.
- FIG. 5 is a cross-sectional view taken along line V-V shown in FIG.
- FIG. 6 is a cross-sectional view taken along line VI-VI shown in FIG. 7 is a cross-sectional view taken along line VII-VII shown in FIG. 3.
- a semiconductor device 1A in this embodiment is a switching device having a trench insulating gate type MISFET (Metal Insulator Semiconductor Field Effect Transistor) as an example of a field effect transistor. be.
- MISFET Metal Insulator Semiconductor Field Effect Transistor
- the semiconductor device 1A includes a silicon chip 2 (semiconductor chip) formed in a rectangular parallelepiped shape.
- the chip 2 includes a first principal surface 3 on one side, a second principal surface 4 on the other side, and first to fourth side surfaces 5A to 5D connecting the first principal surface 3 and the second principal surface 4 together.
- the first main surface 3 and the second main surface 4 are formed in a quadrangular shape when viewed from the normal direction Z (hereinafter simply referred to as "plan view").
- the first side surface 5A and the second side surface 5B extend in the first direction X along the first main surface 3 and face (backward) the second direction Y that intersects (specifically, is perpendicular to) the first direction X. ing.
- the third side surface 5C and the fourth side surface 5D extend in the second direction Y and face the first direction X. As shown in FIG.
- the semiconductor device 1A includes an n-type (first conductivity type) first region 6 formed in the surface layer portion of the first main surface 3 of the chip 2 .
- the first region 6 is formed in the chip 2 with a gap from the second main surface 4 to the first main surface 3 side.
- the first region 6 may also be referred to as a "drift region”.
- the first region 6 is formed in layers extending along the first main surface 3 and exposed from at least one of the first to fourth side surfaces 5A to 5D.
- the first region 6 is formed over the entire surface layer of the first main surface 3 and exposed from all of the first to fourth side surfaces 5A to 5D.
- the first region 6 may have a thickness of 2 ⁇ m or more and 30 ⁇ m or less (preferably 5 ⁇ m or more and 15 ⁇ m or less).
- the first region 6 is formed by an n-type epitaxial layer (specifically, a Si epitaxial layer) in this embodiment.
- the semiconductor device 1A includes a p-type (second conductivity type) second region 7 formed in the surface layer of the first region 6 .
- the second region 7 is formed in the first region 6 with a gap from the bottom of the first region 6 toward the first main surface 3 side.
- the second region 7 may also be referred to as a "body region”.
- the second region 7 is formed in layers extending along the first main surface 3 and exposed from at least one of the first main surface 3 and the first to fourth side surfaces 5A to 5D.
- the second region 7 is formed over the entire surface layer of the first region 6 and exposed from the entire first main surface 3 and all of the first to fourth side surfaces 5A to 5D.
- the second region 7 has a p-type impurity concentration gradient that gradually decreases from the first main surface 3 toward the first region 6 side.
- Second region 7 does not have a portion where the p-type impurity concentration abruptly changes in the thickness direction in the directions (first direction X and second direction Y) along first main surface 3 .
- the second region 7 has a bottom extending flat along the first main surface 3 and does not have a portion where the thickness changes abruptly.
- the second region 7 has a uniform impurity concentration and uniform thickness in the surface layer portion of the first region 6 .
- the second region 7 may have a thickness of 0.1 ⁇ m or more and 3 ⁇ m or less (preferably 0.5 ⁇ m or more and 1.5 ⁇ m or less).
- the second region 7 has a p-type impurity concentration higher than that of the first region 6 and replaces the n-type of the first region 6 with p-type.
- the semiconductor device 1A includes an n-type third region 8 formed in the surface layer portion of the second main surface 4 of the chip 2 .
- the third region 8 has a higher n-type impurity concentration than the first region 6 and is electrically connected to the first region 6 within the chip 2 .
- the third region 8 may be referred to as a "drain region".
- the third region 8 is formed in a layered shape extending along the second main surface 4 and exposed from at least one of the second main surface 4 and the first to fourth side surfaces 5A to 5D.
- the third region 8 is formed over the entire surface layer of the second principal surface 4 and is exposed from the entire second principal surface 4 and all of the first to fourth side surfaces 5A to 5D.
- the third region 8 is thicker than the first region 6 .
- the third region 8 may have a thickness of 50 ⁇ m or more and 400 ⁇ m or less (preferably 50 ⁇ m or more and 150 ⁇ m or less).
- the third region 8 is formed of an n-type semiconductor substrate (specifically, a Si substrate) in this embodiment.
- the semiconductor device 1A includes at least one (one in this embodiment) device region 9 (inner region) set in the inner portion of the first main surface 3 .
- the device region 9 is a region in which MISFETs are formed. The number and arrangement of the device regions 9 are arbitrary, and are adjusted according to the size of the first main surface 3 and the electrical characteristics of the MISFET to be achieved.
- the device region 9 is set in the inner part of the first main surface 3 with a gap from the peripheral edge of the first main surface 3 in plan view. In this form, the device region 9 is set in a polygonal shape having four sides parallel to the first to fourth side surfaces 5A to 5D in plan view.
- the device region 9 has a bent portion 9a recessed toward the fourth side surface 5D on the side on the side of the third side surface 5C. In this form, the bent portion 9a is recessed in a rectangular shape in a plan view.
- the semiconductor device 1A includes an outer region 10 set outside the device region 9 on the first main surface 3 .
- the outer region 10 is a region in which no MISFET is formed, and is set at the peripheral portion of the first main surface 3 .
- Outer region 10 includes annular region 10a and pad region 10b.
- the annular region 10a is set in a ring shape (specifically, a square ring shape) extending along the periphery (first to fourth side surfaces 5A to 5D) of the first main surface 3 in plan view, and surrounds the device region 9. .
- the pad region 10b is set in a region defined by the bent portion 9a of the device region 9 in a plan view, and protrudes from a portion of the annular region 10a along the central portion of the third side surface 5C toward the fourth side surface 5D. there is In this form, the pad area 10b is set to have a square shape in plan view.
- the semiconductor device 1A includes a trench separation structure 20 formed on the first main surface 3.
- the trench isolation structure 20 is formed in an annular shape surrounding the inner side of the second region 7 with a space from the peripheral edge of the first main surface 3 in plan view.
- the trench isolation structure 20 penetrates the second region 7 in a cross-sectional view.
- the trench isolation structure 20 partitions the device region 9 on the inner side of the second region 7 and the outer region 10 on the outer side of the second region 7 on the first main surface 3 .
- the trench isolation structure 20 separates the second region 7 into a portion located within the device region 9 and a portion located within the outer region 10 .
- the second region 7 within the device region 9 may be referred to as the "first body region 7A”
- the second region 7 within the outer region 10 may be referred to as the "second body region 7B”.
- the trench isolation structure 20 may have a width of 0.1 ⁇ m or more and 3 ⁇ m or less (preferably 0.5 ⁇ m or more and 2 ⁇ m or less) in the direction orthogonal to the extending direction.
- the plurality of trench isolation structures 20 may have a depth of 1 ⁇ m to 10 ⁇ m (preferably 1 ⁇ m to 5 ⁇ m).
- the trench isolation structure 20 is formed in a polygonal annular shape having four sides parallel to the first to fourth side surfaces 5A to 5D in plan view.
- the trench isolation structure 20 specifically includes first to fourth trench isolation structures 20A to 20D integrally.
- the first trench isolation structure 20A is located on the first side surface 5A side
- the second trench isolation structure 20B is located on the second side surface 5B side
- the third trench isolation structure 20C is located on the third side surface 5C side
- the fourth trench isolation structure 20C is located on the third side surface 5C side.
- the trench isolation structure 20D is located on the fourth side surface 5D side.
- a pair of the first trench isolation structure 20A and the second trench isolation structure 20B extend in the first direction X while being spaced apart in the second direction Y in plan view.
- the first trench isolation structure 20A is located on the first side surface 5A side with respect to the line
- the second trench isolation structure 20B is located on the side of the line. It is positioned on the second side surface 5B side with respect to the line.
- a pair of the third trench isolation structure 20C and the fourth trench isolation structure 20D are spaced apart in the first direction X and extend in the second direction Y.
- the third trench isolation structure 20C is located on the third side surface 5C side with respect to the line
- the fourth trench isolation structure 20D is located on the third side surface 5C side with respect to the line. It is positioned on the fourth side surface 5D side with respect to the line.
- the trench isolation structure 20 has a trench bent portion 20E recessed toward the fourth side surface 5D in the third trench isolation structure 20C. In this form, the trench bent portion 20E is recessed in a quadrangular shape in plan view, and defines the pad region 10b of the outer region 10 (the bent portion 9a of the device region 9).
- the trench isolation structure 20 includes isolation trenches 21 , isolation insulating films 22 and isolation electrodes 23 .
- Trench isolation structure 20 has a single electrode structure including a single isolation electrode 23 .
- Isolation trenches 21 are formed in first main surface 3 and define inner walls (bottom and sidewalls) of trench isolation structure 20 .
- the isolation trench 21 penetrates the second region 7 and is spaced from the bottom of the first region 6 to the first main surface 3 side.
- the isolation insulating film 22 covers the walls of the isolation trench 21 .
- the isolation insulating film 22 is formed as a relatively thick field insulating film.
- the isolation insulating film 22 may contain a silicon oxide film.
- the isolation electrode 23 is embedded as an integrated member in the isolation trench 21 with the isolation insulating film 22 interposed therebetween.
- the isolation electrode 23 may contain conductive polysilicon.
- a source potential is applied to the separation electrode 23 .
- the source potential may be a reference potential that serves as a reference for circuit operation, or a ground potential.
- the semiconductor device 1A includes a plurality of trench gate structures 30 formed on the first main surface 3 in the device region 9.
- the "first side surface 5A" side will be referred to as “one side”
- the "second side surface 5B side” will be referred to as the “other side”.
- the plurality of trench gate structures 30 are spaced apart in the first direction X and formed in strips extending in the second direction Y, respectively. That is, the plurality of trench gate structures 30 are formed in stripes extending in the second direction Y in plan view.
- the trench isolation structure 20 penetrates the second region 7 in a cross-sectional view.
- the multiple trench gate structures 30 include at least one (a plurality in this embodiment) trench gate structures 30 facing the pad region 10b in the first direction X in plan view.
- the multiple trench gate structures 30 include at least one (a plurality in this embodiment) trench gate structures 30 facing the pad region 10b in the second direction Y in plan view.
- the trench gate structure 30 facing the pad region 10b in the second direction Y is shorter than the trench gate structure 30 facing the pad region 10b in the first direction X. As shown in FIG.
- the plurality of trench gate structures 30 each have a first end 30a on one side and a second end 30b on the other side with respect to the second direction Y. As shown in FIG. Both ends 30a and 30b of the plurality of trench gate structures 30 are respectively connected to a pair of trench isolation structures 20 (first trench isolation structure 20A and second trench isolation structure 20B) extending in the first direction X in this embodiment.
- the interval between the plurality of trench gate structures 30 is preferably set within a range in which the depletion layer covers the bottom walls of the trench isolation structure 20 and the bottom walls of the plurality of trench gate structures 30 .
- a plurality of trench gate structures 30 may be arranged at intervals of 0.1 ⁇ m or more and 2 ⁇ m or less (preferably 0.5 ⁇ m or more and 1.5 ⁇ m or less).
- the plurality of trench gate structures 30 are preferably arranged in the first direction X at substantially equal intervals.
- the plurality of trench gate structures 30 may each have a width in the first direction X of 0.1 ⁇ m or more and 3 ⁇ m or less (preferably 0.5 ⁇ m or more and 2 ⁇ m or less).
- the width of the plurality of trench gate structures 30 is preferably approximately equal to the width of the trench isolation structures 20 .
- the plurality of trench gate structures 30 may have a depth of 1 ⁇ m to 10 ⁇ m (preferably 1 ⁇ m to 5 ⁇ m).
- the depth of the plurality of trench gate structures 30 is preferably approximately equal to the depth of the trench isolation structures 20 .
- Trench gate structure 30 includes gate trench 31 , gate insulating film 32 and gate electrode 33 .
- Gate trench 31 is formed in first main surface 3 and defines the wall surfaces (side walls and bottom walls) of trench gate structure 30 .
- the gate trench 31 penetrates the second region 7 and is spaced from the bottom of the first region 6 to the first main surface 3 side.
- Gate trench 31 has a width and depth substantially equal to isolation trench 21 .
- the gate trench 31 has both end portions 30a and 30b communicating in the second direction Y with the trench isolation structure 20 (isolation trench 21).
- the gate insulating film 32 covers the side walls of the opening and the side walls of the bottom of the gate trench 31 .
- the opening sidewall surface is a wall surface located on the opening side of the gate trench 31 with respect to the bottom of the second region 7 .
- the bottom wall surface is a wall surface located on the bottom wall side of gate trench 31 with respect to the bottom of second region 7 .
- the gate insulating film 32 is connected to the isolation insulating film 22 at the communicating portion between the isolation trench 21 and the gate trench 31 .
- the gate insulating film 32 in this embodiment includes a lower insulating film 34 and an upper insulating film 35 having a thickness different from that of the lower insulating film 34 .
- the lower insulating film 34 covers the bottom side walls of the gate trench 31 .
- the lower insulating film 34 is in contact with the first region 6 exposed from the wall surface of the gate trench 31 .
- the lower insulating film 34 covers the opening side walls and the bottom side walls of the gate trench 31 at both ends 30 a and 30 b of the gate trench 31 in the second direction Y, and is connected to the isolation insulating film 22 of the trench isolation structure 20 .
- the lower insulating film 34 is formed as a relatively thick field insulating film like the isolation insulating film 22 .
- the lower insulating film 34 may contain a silicon oxide film.
- the upper insulating film 35 covers the side walls of the opening of the gate trench 31 .
- the upper insulating film 35 has a portion covering the first region 6 and a portion covering the second region 7 .
- the area covered by the upper insulating film 35 with respect to the second region 7 is larger than the area covered with the upper insulating film 35 with respect to the first region 6 .
- the upper insulating film 35 is formed as a gate insulating film thinner than the lower insulating film 34 .
- the upper insulating film 35 may contain a silicon oxide film.
- the gate electrode 33 is embedded in the gate trench 31 with the gate insulating film 32 interposed therebetween.
- Gate electrode 33 specifically has a multi-electrode structure including lower electrode 36 , upper electrode 37 and intermediate insulating film 38 .
- the lower electrode 36 is buried on the bottom wall side of the gate trench 31 with the gate insulating film 32 (specifically, the lower insulating film 34) interposed therebetween.
- the lower electrode 36 faces the first region 6 with the lower insulating film 34 interposed therebetween.
- the lower electrode 36 is formed in a strip shape extending in the second direction Y when viewed from above, and is formed in a column shape extending in the normal direction Z when viewed in cross section.
- the lower electrode 36 is connected to the isolation electrode 23 at the communicating portion between the isolation trench 21 and the gate trench 31 . Thereby, the lower electrode 36 is formed as a field electrode to which the source potential is applied.
- the connecting portion of the separation electrode 23 and the lower electrode 36 may be regarded as part of the lower electrode 36 or may be regarded as part of the separation electrode 23 .
- Bottom electrode 36 may comprise conductive polysilicon.
- the lower electrode 36 includes a plurality of lead portions 39 led from the bottom wall side of the gate trench 31 to the opening side.
- the plurality of lead-out portions 39 include a lead-out portion 39 on one side (the side of the first side surface 5A) and a lead-out portion 39 on the other side (the side of the second side surface 5B) separated from the lead-out portion 39 on the one side in the second direction Y. including.
- the plurality of lead portions 39 are formed at both ends 30a and 30b of the gate trench 31, respectively, and lead to the opening side of the gate trench 31 with the lower insulating film 34 interposed therebetween.
- the plurality of lead portions 39 extend in the second direction Y in plan view, and are connected to the isolation electrode 23 at the communication portion between the isolation trench 21 and the gate trench 31 .
- the plurality of lead-out portions 39 partition the wall surface of the gate trench 31 and the recess on the opening side of the gate trench 31 .
- the recess is partitioned into strips extending in the second direction Y in plan view.
- the upper electrode 37 is embedded in the opening side of the gate trench 31 with the gate insulating film 32 (specifically, the upper insulating film 35) interposed therebetween. Specifically, the upper electrode 37 is embedded in a recess between the plurality of lead portions 39 on the opening side of the gate trench 31 .
- the upper electrode 37 faces the first region 6 and the second region 7 with the upper insulating film 35 interposed therebetween.
- the upper electrode 37 is formed in a strip shape extending in the second direction Y in plan view.
- the upper electrode 37 has a thickness in the normal direction Z which is less than the thickness of the lower electrode 36 .
- Upper electrode 37 has an upper end located on the bottom wall side of gate trench 31 with respect to first main surface 3 .
- Upper electrode 37 may comprise conductive polysilicon. A gate potential is applied to the upper electrode 37 .
- the intermediate insulating film 38 is interposed between the lower electrode 36 and the upper electrode 37 within the gate trench 31 to electrically insulate the lower electrode 36 and the upper electrode 37 .
- the intermediate insulating film 38 continues to the gate insulating film 32 (the lower insulating film 34 and the upper insulating film 35 ) within the gate trench 31 .
- the intermediate insulating film 38 is preferably thicker than the upper insulating film 35 .
- the intermediate insulating film 38 may contain a silicon oxide film.
- trench gate structure 30 has an internal structure different from trench isolation structure 20 .
- the semiconductor device 1A includes at least one (three in this embodiment) dummy trench structures 40 formed in the first main surface 3 in the device region 9 .
- the three dummy trench structures 40 include a first dummy trench structure 40A, a second dummy trench structure 40B and a third dummy trench structure 40C.
- the first to third dummy trench structures 40A to 40C are interposed in regions between the trench isolation structure 20 and the trench gate structure 30 at the periphery of the device region 9, respectively.
- the first dummy trench structure 40A has the third trench isolation structure 20C and the trench gate structure 30 on one side in the first direction X (the third side surface 5C side) and one side in the second direction Y (the first side surface 5A side). located in the area between The first dummy trench structure 40A faces the pad region 10b in the second direction Y with the trench isolation structure 20 interposed therebetween.
- the second dummy trench structure 40B has the third trench isolation structure 20C and the trench gate structure 30 on one side in the first direction X (the side of the third side surface 5C) and the other side in the second direction Y (the side of the second side surface 5B). located in the area between The second dummy trench structure 40B faces the pad region 10b in the second direction Y with the trench isolation structure 20 interposed therebetween. Also, the second dummy trench structure 40B faces the first dummy trench structure 40A in the second direction Y with the pad region 10b interposed therebetween.
- the third dummy trench structure 40C is arranged in a region between the fourth trench isolation structure 20D and the trench gate structure 30 on the other side of the first direction X (the side of the fourth side surface 5D).
- the third dummy trench structure 40C faces the pad region 10b in the first direction X with a plurality of trench gate structures 30 interposed therebetween.
- the third dummy trench structure 40C faces the first and second dummy trench structures 40A and 40B in the first direction X with the plurality of trench gate structures 30 interposed therebetween.
- the third dummy trench structure 40C is longer than the first and second dummy trench structures 40A-40B.
- a plurality of dummy trench structures 40 are formed in the first direction X from the trench isolation structure 20 and the trench gate structure 30 at intervals, and are formed in a strip shape extending in the second direction Y. The entire area of each dummy trench structure 40 faces the trench isolation structure 20 and the trench gate structure 30 in the first direction X. As shown in FIG. A plurality of dummy trench structures 40 penetrate through the second region 7 in a cross-sectional view.
- the plurality of dummy trench structures 40 each have a first end 40a on one side and a second end 40b on the other side in the second direction Y, respectively. Both ends 40a and 40b of the plurality of dummy trench structures 40 are respectively connected to a pair of trench isolation structures 20 (first trench isolation structure 20A and second trench isolation structure 20B) extending in the first direction X in this embodiment.
- the plurality of dummy trench structures 40 are electrically connected to the trench isolation structure 20 and electrically separated from the plurality of trench gate structures 30 in this form. Specifically, the multiple dummy trench structures 40 are electrically connected to the isolation electrodes 23 of the trench isolation structures 20 and electrically isolated from the upper electrodes 37 of the multiple trench gate structures 30 . Therefore, the dummy trench structures 40 do not function as trench gate structures 30 .
- Each dummy trench structure 40 is formed with a first spacing from the adjacent trench isolation structure 20 and a second spacing from the adjacent trench gate structure 30 .
- the first interval and the second interval are preferably set within a range in which the depletion layer covers the bottom wall of the trench isolation structure 20, the bottom walls of the plurality of trench gate structures 30 and the bottom walls of the plurality of dummy trench structures 40.
- the first spacing and the second spacing may be 0.1 ⁇ m or more and 2 ⁇ m or less (preferably 0.5 ⁇ m or more and 1.5 ⁇ m or less).
- the first spacing and the second spacing are approximately equal to the spacing of the plurality of trench gate structures 30 .
- the second spacing is approximately equal to the first spacing.
- Each dummy trench structure 40 may have a width in the first direction X of 0.1 ⁇ m or more and 3 ⁇ m or less (preferably 0.5 ⁇ m or more and 2 ⁇ m or less). The width of each dummy trench structure 40 is preferably substantially equal to the width of the trench isolation structure 20 (trench gate structure 30). Each dummy trench structure 40 may have a depth of 1 ⁇ m to 10 ⁇ m (preferably 1 ⁇ m to 5 ⁇ m). The depth of each dummy trench structure 40 is preferably substantially equal to the depth of the trench isolation structure 20 (trench gate structure 30).
- a plurality of dummy trench structures 40 each have an internal structure different from that of the trench isolation structure 20 .
- a plurality of dummy trench structures 40 each have an internal structure different from that of the trench gate structure 30 .
- the internal structure of one dummy trench structure 40 will be described below.
- Dummy trench structure 40 has a single electrode structure including dummy trench 41 , dummy insulating film 42 , dummy electrode 43 and buried insulator 44 . Buried insulator 44 may be referred to as a "field insulator.”
- the dummy trenches 41 are formed on the first main surface 3 and partition wall surfaces (side walls and bottom walls) of the dummy trench structure 40 .
- the dummy trench 41 penetrates the second region 7 and is spaced from the bottom of the first region 6 to the first main surface 3 side.
- Dummy trench 41 has a width and depth substantially equal to those of isolation trench 21 .
- the dummy trench 41 has both end portions 40a and 40b communicating in the second direction Y with the trench isolation structure 20 (isolation trench 21).
- the dummy insulating film 42 covers the bottom side wall surface of the dummy trench 41 .
- the bottom wall surface is a wall surface located on the bottom wall side of dummy trench 41 with respect to the bottom of second region 7 .
- the dummy insulating film 42 is in contact with the first region 6 exposed from the wall surface of the dummy trench 41 .
- the dummy insulating film 42 covers the opening sidewall surface and the bottom sidewall surface of the dummy trench 41 at both ends 40 a and 40 b of the dummy trench 41 in the second direction Y, and is connected to the isolation insulating film 22 of the trench isolation structure 20 . .
- the dummy insulating film 42 is thicker than the upper insulating film 35 of the trench gate structure 30 .
- the dummy insulating film 42 is formed as a relatively thick field insulating film like the isolation insulating film 22 (lower insulating film 34).
- the dummy insulating film 42 may contain a silicon oxide film
- the dummy electrode 43 is buried on the bottom wall side of the dummy trench 41 with the dummy insulating film 42 interposed therebetween.
- the dummy electrode 43 faces the first region 6 with the dummy insulating film 42 interposed therebetween.
- the dummy electrode 43 is formed in a strip shape extending in the second direction Y in plan view, and in a columnar shape extending in the normal direction Z in cross section view.
- the dummy electrode 43 faces the isolation electrode 23 of the trench isolation structure 20 and the lower electrode 36 of the trench gate structure 30 in the first direction X.
- the dummy electrode 43 preferably does not face the upper electrode 37 of the trench gate structure 30 in the first direction X.
- the dummy electrode 43 is connected to the isolation electrode 23 at the communicating portion between the isolation trench 21 and the dummy trench 41 .
- Dummy electrode 43 is electrically insulated from upper electrode 37 by intermediate insulating film 38 of trench gate structure 30 . Thereby, the dummy electrode 43 is formed as a field electrode to which the source potential is applied.
- the connecting portion of the separation electrode 23 and the dummy electrode 43 may be regarded as part of the dummy electrode 43 or may be regarded as part of the separation electrode 23 .
- the dummy electrode 43 may contain conductive polysilicon.
- the dummy electrode 43 includes a plurality of dummy lead portions 45 drawn from the bottom wall side of the dummy trench 41 toward the opening side.
- the plurality of dummy lead-out portions 45 are divided into dummy lead-out portion 45 on one side (first side surface 5A side) and dummy lead-out portion 45 on the other side (second side surface 5B side) spaced apart in the second direction Y from the dummy lead-out portion 45 on one side.
- a dummy drawer 45 is included.
- the plurality of dummy lead-out portions 45 are formed at both end portions 40a and 40b of the dummy trench 41 and lead out to the opening side of the dummy trench 41 with the dummy insulating film 42 interposed therebetween.
- the plurality of dummy lead-out portions 45 extend in the second direction Y in plan view, and are connected to the isolation electrode 23 at the communication portion between the isolation trench 21 and the dummy trench 41 .
- the plurality of dummy lead-out portions 45 face the isolation electrode 23 of the trench isolation structure 20 and the plurality of lead-out portions 39 of the trench gate structure 30 in the first direction X.
- the plurality of dummy lead-out portions 45 partition the wall surface of the dummy trench 41 and the recess on the opening side of the dummy trench 41 .
- the recess is partitioned into strips extending in the second direction Y in plan view.
- the embedded insulator 44 is embedded in the opening side of the dummy trench 41 and seals the dummy electrode 43 inside the dummy trench 41 .
- the buried insulator 44 is buried in a recess defined by the side wall of the dummy trench 41 and the dummy electrode 43 (a plurality of dummy lead-out portions 45) in the dummy trench 41.
- the embedded insulator 44 faces the first region 6 and the second region 7 with the upper insulating film 35 interposed therebetween.
- the embedded insulator 44 preferably covers the entire area of the dummy electrode 43 within the recess.
- the buried insulator 44 faces the isolation electrode 23 of the trench isolation structure 20 and the top electrode 37 of the trench gate structure 30 in the first direction X.
- the buried insulator 44 preferably does not face the bottom electrode 36 of the trench gate structure 30 in the first direction X.
- Buried insulator 44 may comprise silicon oxide.
- the embedded insulator 44 is thicker than the isolation insulating film 22 (lower insulating film 34).
- the dummy trench structure 40 has an internal structure different from the trench isolation structure 20 in that it includes the embedded insulator 44 covering the dummy electrode 43 within the dummy trench 41 .
- the dummy trench structure 40 has an internal structure different from that of the trench gate structure 30 in that it does not include an electrode facing the dummy electrode 43 with the embedded insulator 44 interposed in the dummy trench 41 .
- the dummy trench structure 40 relieves stress generated between the trench isolation structure 20 and the trench gate structure 30 having different internal structures, and suppresses variations in electrical characteristics caused by the stress.
- the semiconductor device 1A includes a plurality of mesa portions 50 partitioned into the device regions 9 .
- the plurality of mesa portions 50 are partitioned by the trench isolation structures 20, the plurality of trench gate structures 30 and the plurality of dummy trench structures 40, respectively.
- the plurality of mesa portions 50 are each made up of a portion of the chip 2 and include the first region 6 and the second region 7 respectively.
- the plurality of mesa portions 50 are partitioned at intervals in the first direction X and formed in strips extending in the second direction Y, respectively. That is, the plurality of mesa portions 50 are formed in stripes extending in the second direction Y.
- the plurality of mesa portions 50 each include a first region 6 and a second region 7 extending along the second direction Y in a strip shape.
- the multiple mesa portions 50 include multiple first mesa portions 50A, multiple second mesa portions 50B, and multiple third mesa portions 50C.
- Each first mesa portion 50A is defined in a region between a pair of trench gate structures 30 adjacent in the first direction X.
- each first mesa portion 50A is partitioned by a pair of trench gate structures 30 adjacent in the first direction X in a region between the pair of trench isolation structures 20 extending in the first direction X.
- each first mesa portion 50A is partitioned by an annular trench structure that integrally includes a pair of trench isolation structures 20 and a pair of trench gate structures 30 .
- Each second mesa portion 50B is partitioned into a region between the trench gate structure 30 and the dummy trench structure 40 adjacent in the first direction X. Specifically, each second mesa portion 50B is partitioned by the trench gate structure 30 and the dummy trench structure 40 adjacent in the first direction X in the region between the pair of trench isolation structures 20 extending in the first direction X. ing. That is, each second mesa portion 50B is partitioned by an annular trench structure that integrally includes a pair of trench isolation structures 20, trench gate structures 30 and dummy trench structures 40. As shown in FIG.
- Each third mesa portion 50C is partitioned into a region between the trench isolation structure 20 and the dummy trench structure 40 adjacent in the first direction X. Specifically, each third mesa portion 50C is partitioned by the trench isolation structure 20 and the dummy trench structure 40 adjacent in the first direction X in the region between the pair of trench isolation structures 20 extending in the first direction X. ing. That is, each third mesa portion 50 ⁇ /b>C is partitioned by an annular trench structure that integrally includes a pair of trench isolation structures 20 , trench isolation structures 20 and dummy trench structures 40 .
- the semiconductor device 1A includes at least one (in this embodiment, a plurality of) inner diodes D1 formed in the device region 9.
- a plurality of inner diodes D1 have first regions 6 and second regions 7 (first body regions 7A) located in device regions 9 .
- the plurality of inner diodes D1 are formed in the plurality of first mesa portions 50A and the plurality of second mesa portions 50B, respectively, and define the first region 6 and the second region 7 forming the pn junction, respectively. include. That is, the inner diodes D1 each include a first region 6 as a cathode and a second region 7 as an anode.
- the plurality of inner diodes D1 are arranged in the first direction X at intervals in a plan view, and are each formed in a band shape extending in the second direction Y.
- a cathode (first region 6 ) of the inner diode D1 is electrically connected to the third region 8 .
- the anode (second region 7 ) of inner diode D1 is electrically connected to isolation electrode 23 of trench isolation structure 20 , lower electrode 36 of trench gate structure 30 and dummy electrode 43 of dummy trench structure 40 . That is, the inner diode D1 is electrically connected between the source and the drain and functions as a body diode of the MISFET.
- the semiconductor device 1A includes at least one (one in this embodiment) outer diode D2 located in the outer region 10.
- Semiconductor device 1A does not include trench gate structure 30 penetrating outer diode D2 in outer region 10 in this embodiment. That is, only the outer diode D2 is formed in the outer region 10 .
- Outer diode D2 has first region 6 and second region 7 (second body region 7B) located in outer region 10 .
- the outer diode D2 specifically includes a first region 6 and a second region 7 forming a pn junction within the outer region 10 . That is, the plurality of outer diodes D2 includes first regions 6 as cathodes and second regions 7 as anodes.
- the outer diode D2 may be exposed from at least one of the first to fourth side surfaces 5A to 5D.
- the outer diode D2 is formed in the entire region between the periphery of the first main surface 3 and the trench isolation structure 20, and exposed from all of the first to fourth side surfaces 5A to 5D. That is, the outer diode D2 is formed over the entire outer region 10 (annular region 10a and pad region 10b) in plan view, and surrounds the device region 9. As shown in FIG.
- the outer diode D2 is electrically isolated from the plurality of trench gate structures 30, the plurality of dummy trench structures 40, and the plurality of inner diodes D1 by the trench isolation structure 20.
- Outer diode D2 is specifically electrically isolated from isolation electrode 23 of trench isolation structure 20, lower electrode 36 and upper electrode 37 of trench gate structure 30, and dummy electrode 43 of dummy trench structure 40. .
- the cathode of the outer diode D2 is electrically connected through the first region 6 to the cathode of the inner diode D1, and the anode of the outer diode D2 is electrically open. Therefore, the outer diode D2 consists of a floating diode formed in an electrically floating state between the source and the drain, and does not function as a body diode of the MISFET.
- the semiconductor device 1A includes at least one (three in this embodiment) intermediate diodes D3 formed in a region (periphery of the device region 9) different from the inner diode D1 in the device region 9.
- the plurality of intermediate diodes D3 are respectively formed within the plurality of third mesa portions 50C and include first regions 6 and second regions 7 (first body regions 7A) forming pn junctions.
- each of the intermediate diodes D3 includes a first region 6 as a cathode and a second region 7 as an anode.
- the plurality of intermediate diodes D3 are formed in strips extending in the second direction Y, respectively.
- a plurality of intermediate diodes D3 face the inner diodes D1 with the corresponding dummy trench structures 40 interposed therebetween, and face the outer diodes D2 with the trench isolation structures 20 interposed therebetween.
- the multiple intermediate diodes D3 sandwich the multiple inner diodes D1 from both sides in the first direction X in plan view.
- the plurality of intermediate diodes D3 are electrically isolated from the plurality of trench gate structures 30, the plurality of inner diodes D1 and the outer diodes D2 by the trench isolation structures 20 and the plurality of dummy trench structures 40.
- the plurality of intermediate diodes D3 are specifically electrically isolated from the isolation electrode 23 of the trench isolation structure 20, the lower electrode 36 and the upper electrode 37 of the trench gate structure 30, and the dummy electrode 43 of the dummy trench structure 40. ing.
- the cathode of the intermediate diode D3 is electrically connected through the first region 6 to the cathode of the inner diode D1 and the cathode of the outer diode D2, and the anode of the intermediate diode D3 is electrically open. Therefore, like the outer diodes D2, the plurality of intermediate diodes D3 are respectively floating diodes formed in an electrically floating state between the source and the drain, and do not function as body diodes of the MISFET.
- the semiconductor device 1A includes a plurality of source regions 60 (impurity regions) formed in the surface layer portion of the second region 7 so as to be in contact with the plurality of trench gate structures 30 in the device region 9 .
- the plurality of source regions 60 each have a higher n-type impurity concentration than the first region 6 and are formed spaced apart from the bottom of the second region 7 toward the first main surface 3 side.
- the plurality of source regions 60 are respectively formed in regions between the plurality of adjacent trench gate structures 30 .
- a plurality of source regions 60 are not formed in regions between adjacent trench gate structures 30 and dummy trench structures 40 in this embodiment.
- the plurality of source regions 60 are not formed in the regions between the trench isolation structures 20 and the dummy trench structures 40 in this embodiment. That is, the plurality of source regions 60 are formed only in the plurality of first mesa portions 50A, and are not formed in the second to third mesa portions 50B to 50C. In this embodiment, the source region 60 is not formed in the outermost first mesa portion 50A adjacent to the second mesa portion 50B among the plurality of first mesa portions 50A.
- a plurality of source regions 60 are formed spaced apart from the trench isolation structure 20 . Specifically, the plurality of source regions 60 are formed spaced apart in the second direction Y from the pair of trench isolation structures 20 extending in the first direction X, respectively. That is, the plurality of source regions 60 are connected in the first direction X to the plurality of trench gate structures 30 and are not connected in the second direction Y to the plurality of trench isolation structures 20 .
- the plurality of source regions 60 are formed in strips extending in the second direction Y, respectively.
- the plurality of source regions 60 are opposed to the gate electrode 33 with the gate insulating film 32 interposed with respect to the corresponding trench gate structure 30 .
- the plurality of source regions 60 face the upper electrode 37 with the upper insulating film 35 interposed therebetween and do not face the lower electrode 36 .
- the plurality of source regions 60 are formed inside the plurality of lead portions 39 of the trench gate structure 30 in plan view.
- the plurality of source regions 60 are respectively formed in regions between the plurality of lead portions 39 in plan view, and do not face the plurality of lead portions 39 in the first direction X.
- the entire area of the plurality of source regions 60 faces the upper electrode 37 of one or more adjacent trench gate structures 30 .
- a plurality of source regions 60 form channels of the first region 6 and the MISFET in the second region 7, respectively. That is, a plurality of channels are formed in the plurality of first mesa portions 50A (excluding the outermost first mesa portion 50A in this embodiment), and are not formed in the second to third mesa portions 50B to 50C.
- a plurality of channels are controlled by a plurality of trench gate structures 30 respectively.
- the semiconductor device 1A includes a plurality of contact holes 61 respectively formed in the first main surface 3 so as to penetrate the plurality of source regions 60 .
- the plurality of contact holes 61 are formed in regions between the plurality of trench gate structures 30 that are spaced from the plurality of trench gate structures 30 and adjacent to each other.
- a plurality of contact holes 61 are formed in regions between the trench gate structures 30 and the dummy trench structures 40 adjacent to each other with a space therebetween.
- a plurality of contact holes 61 are not formed in the regions between adjacent trench isolation structures 20 and dummy trench structures 40 . That is, the plurality of contact holes 61 are formed in the first and second mesa portions 50A and 50B (including the outermost first mesa portion 50A), and are not formed in the third mesa portion 50C.
- the plurality of contact holes 61 are formed in the first direction X spaced apart from the plurality of trench gate structures 30 and the plurality of dummy trench structures 40 and in the second direction Y spaced apart from the plurality of trench isolation structures 20 . It is The plurality of contact holes 61 are formed in strips extending in the second direction Y, respectively. The plurality of contact holes 61 may cross the end of the source region 60 corresponding to the second direction Y in plan view. The plurality of contact holes 61 are formed inside the plurality of lead-out portions 39 of the trench gate structure 30 in plan view.
- the plurality of contact holes 61 are respectively formed in regions between the plurality of lead portions 39 in plan view, and do not face the plurality of lead portions 39 in the first direction X.
- the entire area of the plurality of contact holes 61 faces the upper electrodes 37 of the plurality of trench gate structures 30 in the first direction X in plan view.
- the semiconductor device 1A includes a plurality of p-type contact regions 62 respectively formed in regions along the plurality of contact holes 61 in the surface layer portion of the second region 7 .
- the plurality of contact regions 62 each have a p-type impurity concentration higher than that of the second region 7 and cover the bottom walls of the corresponding contact holes 61 spaced apart from the bottom of the second region 7 .
- the plurality of contact regions 62 may be formed in strips extending along the bottom walls of the corresponding contact holes 61 in plan view.
- a plurality of contact regions 62 are spaced in the first direction X from the plurality of trench gate structures 30 and spaced in the second direction Y from the plurality of trench isolation structures 20 .
- a plurality of contact regions 62 may cover sidewalls of corresponding contact holes 61 .
- the semiconductor device 1A includes a field insulating film 70 covering the trench isolation structure 20 on the first main surface 3 .
- Field insulating film 70 includes a silicon oxide film in this form. Specifically, the field insulating film 70 is formed along the inner wall of the trench isolation structure 20 in the device region 9 and along the outer wall of the trench isolation structure 20 in the outer region 10 .
- the field insulating film 70 covers the region between the trench isolation structure 20 and the dummy trench structure 40 (that is, the region including the third mesa portion 50C) in the device region 9, and covers the plurality of trench gate structures 30 and the plurality of dummy trench structures. 40 is exposed. That is, the field insulating film 70 exposes the inner diode D1 and the intermediate diode D3. The field insulating film 70 continues to the isolation insulating film 22 exposed from the inner wall side of the isolation trench 21 so as to expose the isolation electrode 23 .
- the field insulating film 70 covers the peripheral edge of the first main surface 3 (first to fourth side surfaces 5A to 5D) and the region between the trench isolation structure 20 in the outer region 10 . That is, the field insulating film 70 covers the outer diode D2. In this embodiment, the field insulating film 70 covers the entire outer region 10 and continues to the peripheral edge of the first main surface 3 (first to fourth side surfaces 5A to 5D). That is, the field insulating film 70 covers the entire area of the outer diode D2 in this form.
- the field insulating film 70 continues to the isolation insulating film 22 exposed from the outer wall side of the isolation trench 21 so as to expose the isolation electrode 23 .
- the field insulating film 70 may cover the peripheral edge portion of the first main surface 3 while being spaced inwardly from the peripheral edge of the first main surface 3 (the first to fourth side surfaces 5A to 5D). That is, the field insulating film 70 may partially cover the outer diode D2.
- the semiconductor device 1A includes a principal surface insulating film 71 that selectively covers the first principal surface 3 .
- the main surface insulating film 71 is an insulating film thinner than the field insulating film 70 and covers the region outside the field insulating film 70 on the first main surface 3 .
- Main surface insulating film 71 includes a silicon oxide film in this embodiment. Specifically, the main surface insulating film 71 covers the regions outside the plurality of trench gate structures 30, the plurality of dummy trench structures 40 and the field insulating film 70 on the first main surface 3, the upper insulating film 35, the dummy insulating film It continues to film 42 and field insulating film 70 .
- the main surface insulating film 71 covers the plurality of mesa portions 50 (first to third mesa portions 50A to 50C). Also, the main surface insulating film 71 covers the plurality of inner diodes D1 and the plurality of intermediate diodes D3. The main surface insulating film 71 is thinner than the isolation insulating film 22 (lower insulating film 34). The thickness of the main surface insulating film 71 may be substantially equal to the thickness of the upper insulating film 35 .
- the main surface insulating film 71 forms the field insulation film at the peripheral edge of the first main surface 3. A portion exposed from the insulating film 70 may be covered. In this case, outer diode D 2 is covered with field insulating film 70 and main surface insulating film 71 .
- the principal surface insulating film 71 may be continuous with the periphery of the first principal surface 3 (first to fourth side surfaces 5A to 5D).
- the semiconductor device 1A includes an interlayer insulating film 72 covering the first main surface 3.
- the interlayer insulating film 72 may have a laminated structure in which a plurality of insulating films are laminated, or may have a single-layer structure consisting of a single insulating film.
- Interlayer insulating film 72 may include at least one of a silicon oxide film, a silicon nitride film, and a silicon oxynitride film.
- the interlayer insulating film 72 covers the multiple trench isolation structures 20 , the multiple trench gate structures 30 , the multiple dummy trench structures 40 , the field insulating film 70 and the main surface insulating film 71 . In this embodiment, the interlayer insulating film 72 covers the entire first main surface 3 and continues to the first to fourth side surfaces 5A to 5D.
- the semiconductor device 1A includes a plurality of via electrodes 80 embedded in the interlayer insulating film 72.
- the multiple via electrodes 80 include multiple gate via electrodes 81 , multiple first source via electrodes 82 and multiple second source via electrodes 83 .
- a plurality of gate via electrodes 81 pass through the interlayer insulating film 72 and are electrically connected to the corresponding upper electrodes 37 on both end portions 30 a and 30 b of the corresponding trench gate structure 30 .
- the plurality of gate via electrodes 81 are arranged at intervals in the first direction X and the second direction Y and face the first direction X and the second direction Y in plan view.
- the connection positions of the plurality of gate via electrodes 81 with respect to the upper electrode 37 are arbitrary.
- the plurality of gate via electrodes 81 do not necessarily have to be arranged on the same line extending in the first direction X in plan view, and may be arranged in a mutually shifted manner in the second direction Y.
- a plurality of first source via electrodes 82 pass through the interlayer insulating film 72 and are embedded in the plurality of contact holes 61 respectively.
- the plurality of first source via electrodes 82 are electrically connected to the second region 7 , the plurality of source regions 60 and the plurality of contact regions 62 within the plurality of contact holes 61 .
- a plurality of second source via electrodes 83 pass through the interlayer insulating film 72 and are electrically connected to the isolation electrodes 23 of the trench isolation structure 20 (leading portions 39 of the trench gate structure 30). That is, the plurality of second source via electrodes 83 are electrically connected to the lower electrodes 36 of the plurality of trench gate structures 30 via the separation electrodes 23 .
- the plurality of second source via electrodes 83 are arranged in dots at intervals along the separation electrode 23 in plan view.
- the plurality of via electrodes 80 may include one or a plurality of second source via electrodes 83 extending like strips along the separation electrode 23 in plan view.
- the semiconductor device 1A includes gate wiring electrodes 90 arranged on a plurality of gate via electrodes 81 and transmitting gate potentials. Specifically, the gate wiring electrode 90 is arranged on the interlayer insulating film 72 . Gate wiring electrode 90 includes gate pad electrode 91 and gate finger electrode 92 . The gate pad electrode 91 is a terminal electrode externally connected to a conductive connection member (eg, bonding wire, conductive plate, etc.). A gate potential is applied to the gate pad electrode 91 .
- a conductive connection member eg, bonding wire, conductive plate, etc.
- the gate pad electrode 91 is formed in a square shape on a portion along the central portion of the third side surface 5C in plan view. Specifically, the gate pad electrode 91 overlaps the pad region 10b of the outer region 10 in plan view. That is, the gate pad electrode 91 overlaps the outer diode D2 in plan view. It is preferable that the gate pad electrode 91 be spaced from the trench isolation structure 20 on the pad region 10b side in plan view. Gate pad electrode 91 preferably does not overlap trench isolation structure 20 , trench gate structure 30 and dummy trench structure 40 in plan view. The entire area of the gate pad electrode 91 preferably overlaps the outer diode D2 in plan view.
- the gate finger electrodes 92 are drawn out from the gate pad electrodes 91 onto the interlayer insulating film 72 .
- the gate finger electrodes 92 extend in strips along the periphery of the device region 9 so as to intersect (more specifically, perpendicularly) the plurality of trench gate structures 30 in plan view.
- the gate finger electrodes 92 need only extend along at least two of the first to fourth side surfaces 5A to 5D (first to fourth trench isolation structures 20A to 20D) in plan view.
- the gate finger electrode 92 has a first side surface 5A (first trench isolation structure 20A), a second side surface 5B (second trench isolation structure 20B) and a third side surface 5C (third trench isolation structure 20C) in plan view. ) and intersects (specifically, orthogonally) the ends 30 a , 30 b of the plurality of trench gate structures 30 .
- the gate finger electrodes 92 partially overlap the plurality of inner diodes D1 in plan view.
- the gate finger electrodes 92 may overlap the plurality of dummy trench structures 40 in plan view. In this case, the gate finger electrodes 92 may partially overlap the plurality of intermediate diodes D3 in plan view.
- Gate finger electrodes 92 are connected to a plurality of gate via electrodes 81 .
- the gate finger electrodes 92 apply the gate potential applied to the gate pad electrode 91 to the multiple gate via electrodes 81 .
- the semiconductor device 1A includes a source wiring electrode 93 arranged on the plurality of first and second source via electrodes 82 and 83 and transmitting a source potential.
- the source wiring electrode 93 is arranged on the same layer as the gate wiring electrode 90 (that is, on the interlayer insulating film 72) with a space from the gate wiring electrode 90. facing each other.
- Source line electrode 93 includes source pad electrode 94 and source finger electrode 95 .
- the source pad electrode 94 is a terminal electrode externally connected to a conductive connection member (eg, bonding wire, conductive plate, etc.).
- the source pad electrode 94 is arranged in a region partitioned by the gate wiring electrode 90 in plan view and overlaps the device region 9 .
- the source pad electrode 94 has a concave portion recessed from the center of the side along the third side surface 5C toward the fourth side surface 5D so as to match the gate pad electrode 91 (pad region 10b) in plan view. It is formed in a polygonal shape with
- the source pad electrode 94 overlaps the plurality of trench gate structures 30 and the plurality of dummy trench structures 40 in plan view. That is, the source pad electrode 94 overlaps the multiple inner diodes D1 and the multiple intermediate diodes D3.
- the source pad electrode 94 is connected to the multiple first source via electrodes 82 .
- a source potential applied to the source pad electrode 94 is applied to the second region 7 , the plurality of source regions 60 and the plurality of contact regions 62 via the plurality of first source via electrodes 82 .
- the source finger electrodes 95 are drawn out from the source pad electrodes 94 to the same layer as the gate wiring electrodes 90 (that is, above the interlayer insulating film 72).
- the source finger electrodes 95 are pulled out from the source pad electrodes 94 to regions between the peripheral portion of the first main surface 3 and the gate finger electrodes 92 in plan view, and extend in a strip shape along the trench isolation structure 20 .
- the source finger electrodes 95 need only extend along at least two of the first to fourth side surfaces 5A to 5D (first to fourth trench isolation structures 20A to 20D) in plan view.
- the source finger electrodes 95 extend along the first to fourth side surfaces 5A to 5D (first to fourth trench isolation structures 20A to 20D) in plan view.
- the source finger electrodes 95 are formed in a ring shape surrounding the gate pad electrodes 91, the gate finger electrodes 92 and the source pad electrodes 94 in plan view.
- the source finger electrodes 95 overlap part of the plurality of inner diodes D1, part of the outer diodes D2, and part of the intermediate diodes D3 in plan view.
- the source finger electrodes 95 are connected to the multiple second source via electrodes 83 .
- the source finger electrodes 95 apply the source potential applied to the source pad electrode 94 to the plurality of second source via electrodes 83 .
- the source potentials applied to the plurality of second source via electrodes 83 are applied to the lower electrodes 36 of the plurality of trench gate structures 30 through the isolation electrodes 23 (leading portions 39).
- the semiconductor device 1A includes a drain electrode 96 covering the second main surface 4.
- the drain electrode 96 covers the entire second main surface 4 and continues to the peripheral edge of the first main surface 3 (first to fourth side surfaces 5A to 5D).
- the drain electrode 96 is electrically connected to the third region 8 .
- the semiconductor device 1A includes the chip 2, the first region 6, the second region 7, the trench isolation structure 20, the trench gate structure 30, the inner diode D1 and the outer diode D2.
- Chip 2 has a first main surface 3 .
- the first region 6 is formed in the surface layer portion of the first main surface 3 .
- the second region 7 is formed on the surface layer of the first region 6 .
- the trench isolation structure 20 is annularly formed on the first main surface 3 so as to surround the inner side of the second region 7 in plan view, and penetrates the second region 7 in cross-sectional view.
- the trench isolation structure 20 partitions the device region 9 (inner region) on the inner side of the second region 7 and the outer region 10 on the outer side of the second region 7 on the first main surface 3 .
- a trench gate structure 30 is formed in the device region 9 so as to penetrate the second region 7 .
- Inner diode D1 includes first region 6 and second region 7 located in device region 9 .
- Outer diode D2 includes first region 6 and second region 7 located in outer region 10 .
- Outer diode D2 is electrically isolated from trench gate structure 30 and inner diode D1 by trench isolation structure 20 .
- the electrical characteristics on the device region 9 side are restricted by the electrical characteristics on the outer region 10 side.
- the breakdown voltage (specifically, breakdown voltage) on the outer region 10 side is lower than the breakdown voltage (specifically, breakdown voltage) on the device region 9 side due to the absence of the trench gate structure 30 .
- the outer region 10 (outer diode D2) becomes the starting point of breakdown when the breakdown voltage is applied.
- the semiconductor device 1A with improved electrical characteristics. As an example, it is possible to provide a semiconductor device 1A capable of improving the breakdown voltage.
- the outer diode D2 preferably consists of a floating diode formed in an electrically floating state. This structure can appropriately suppress the electrical influence of the outer region 10 on the device region 9 .
- the outer diode D2 may surround the trench isolation structure 20 in plan view.
- the chip 2 may have first to fourth side surfaces 5A to 5D.
- the first region 6 may be exposed from at least one of the first to fourth side surfaces 5A to 5D.
- the second region 7 may be exposed from at least one of the first to fourth side surfaces 5A-5D. That is, the outer diode D2 may be exposed from at least one of the first to fourth side surfaces 5A to 5D.
- the outer diode D2 when the outer diode D2 is electrically disconnected from the inner diode D1, the electrical influence of the outer region 10 on the device region 9 can be suppressed.
- a second region 7 (outer diode D2) exposed from at least one of them can be formed. That is, the design rule imposed on the second region 7 can be relaxed while improving the electrical characteristics.
- the second region 7 may be exposed from all of the first to fourth side surfaces 5A to 5D. According to this structure, the second region 7 can be formed without using a resist mask, so the cost can be reduced.
- the trench gate structure 30 preferably has a multi-electrode structure including a lower electrode 36 and an upper electrode 37 vertically separated and embedded in the gate trench 31 .
- the second region 7 of the inner diode D1 is preferably electrically connected to the lower electrode .
- a plurality of trench gate structures 30 may be arranged in stripes in the device region 9 .
- the trench isolation structure 20 may include an isolation electrode 23 embedded within the isolation trench 21 .
- the second region 7 of the inner diode D1 is preferably electrically connected to the separation electrode 23.
- FIG. Trench isolation structure 20 preferably has a different internal structure than trench gate structure 30 .
- Trench isolation structure 20 preferably has a single electrode structure including a single isolation electrode 23 .
- the semiconductor device 1A preferably includes a source region 60 (impurity region) in the device region 9.
- Source region 60 is preferably formed in the surface layer portion of first main surface 3 so as to be in contact with trench gate structure 30 .
- Source region 60 is preferably spaced from trench isolation structure 20 so as not to contact trench isolation structure 20 . According to this structure, undesirable current paths can be suppressed.
- the semiconductor device 1A preferably includes a dummy trench structure 40 formed in a region between the trench isolation structure 20 and the trench gate structure 30 in the device region 9.
- the dummy trench structure 40 is preferably formed to penetrate the second region 7 and electrically separated from the trench gate structure 30 . According to this structure, stress generated between the trench isolation structure 20 and the trench gate structure 30 can be relieved by the dummy trench structure 40 . As a result, variations in electrical characteristics on the side of the device region 9 caused by stress generated between the trench isolation structure 20 and the trench gate structure 30 can be suppressed.
- the dummy trench structure 40 preferably has an internal structure different from that of the trench gate structure 30 .
- Dummy trench structure 40 preferably has an internal structure different from trench isolation structure 20 .
- the dummy trench structure 40 may include a dummy electrode 43 buried on the bottom side of the dummy trench 41 and a buried insulator 44 buried on the opening side of the dummy trench 41 .
- Dummy trench structure 40 preferably does not include an electrode facing dummy electrode 43 with buried insulator 44 interposed in dummy trench 41 .
- the semiconductor device 1A may include an intermediate diode D3 including the first region 6 and the second region 7 positioned between the trench isolation structure 20 and the dummy trench structure 40 in the device region 9.
- Middle diode D3 is preferably electrically isolated from outer diode D2 by trench isolation structure 20 .
- Middle diode D3 may be electrically isolated from inner diode D1 by dummy trench structure 40 .
- the intermediate diode D3 acts as a buffer between the inner diode D1 and the outer diode D2, so that the inner diode D1 and the outer diode D2 are properly electrically isolated.
- the semiconductor device 1A includes a chip 2, a trench isolation structure 20, a trench gate structure 30, a first body region 7A and a second body region 7B.
- Chip 2 has a first main surface 3 .
- the trench isolation structure 20 is formed in a strip shape extending in the first direction X on the first main surface 3 .
- the trench gate structure 30 is formed on the first main surface 3 in a strip shape extending in a second direction Y intersecting the first direction X, and partitions the trench isolation structure 20 and the mesa portion 50 (first mesa portion 50A). .
- the first body region 7A is formed in the surface layer portion of the first main surface 3 within the mesa portion 50 .
- the second body region 7B is formed on the surface layer portion of the first principal surface 3 outside the mesa portion 50. As shown in FIG.
- the second body region 7B is electrically separated from the first body region 7A by the trench isolation structure 20. As shown in FIG. According to this structure, it is possible to prevent the electrical characteristics on the first body region 7A side from being restricted by the electrical characteristics on the second body region 7B side. Therefore, it is possible to provide the semiconductor device 1A with improved electrical characteristics.
- the first body region 7A is preferably in contact with the trench gate structure 30.
- the second body region 7B is preferably in contact with the trench isolation structure 20. As shown in FIG.
- the second body region 7B is preferably formed in an electrically floating state. This structure can appropriately suppress the electrical influence of the second body region 7B on the first body region 7A. In this case, a source potential is preferably applied to the first body region 7A.
- a pair of trench isolation structures 20 are preferably arranged on the first main surface 3 with a space therebetween in the second direction Y.
- the trench gate structure 30 is preferably formed in a region sandwiched between the pair of trench isolation structures 20 and partitions the pair of trench isolation structures 20 and the mesa portion 50 .
- a pair of trench gate structures 30 are arranged with a gap in the first direction X in a region sandwiched between the pair of trench isolation structures 20 to partition the pair of trench isolation structures 20 and the mesa portion 50 . is preferred.
- the first body region 7A is preferably in contact with the pair of trench isolation structure 20 and trench gate structure 30 within the mesa portion 50 .
- the first body region 7A preferably extends in a strip shape along the trench gate structure 30 in plan view.
- the second body region 7B is preferably in contact with one or both of the pair of trench isolation structures 20 outside the mesa portion 50 .
- Second body region 7B preferably surrounds trench isolation structure 20 and trench gate structure 30 in plan view.
- the chip 2 may have first to fourth side surfaces 5A to 5D.
- the second body region 7B may be exposed from at least one of the first to fourth side surfaces 5A to 5D, or may be exposed from all of the first to fourth side surfaces 5A to 5D. good too.
- the semiconductor device 1A preferably includes a source region 60 (impurity region) formed in the surface layer of the first body region 7A.
- Source region 60 preferably abuts trench gate structure 30 . It is preferable that the source region 60 is not formed in the surface layer portion of the second body region 7B.
- the source region 60 preferably extends in a strip shape along the trench gate structure 30 in plan view. Source region 60 is preferably spaced from trench isolation structure 20 so as not to contact trench isolation structure 20 . According to this structure, undesirable current paths can be suppressed.
- the semiconductor device 1A preferably includes a dummy trench structure 40 that is spaced apart in the first direction X from the trench gate structure 30 and extends in the second direction Y and that is electrically isolated from the trench gate structure 30 .
- the second body region 7B is preferably electrically separated from the dummy trench structure 40.
- the first body region 7A may be electrically separated from the dummy trench structure 40.
- FIG. 8 is a plan view corresponding to FIG. 2 and showing the structure of the first main surface 3 of the chip 2 of the semiconductor device 1B according to the second embodiment.
- FIG. 9 is an enlarged view of region IX shown in FIG. 10 is a cross-sectional view taken along line X-X shown in FIG. 9.
- FIG. 11 is a cross-sectional view taken along line XI-XI shown in FIG. 9.
- FIG. 12 is a cross-sectional view taken along line XII-XII shown in FIG. 9.
- FIG. 13 is a cross-sectional view taken along line XIII-XIII shown in FIG. 9.
- FIG. 9 is an enlarged view of region IX shown in FIG. 10 is a cross-sectional view taken along line X-X shown in FIG. 9.
- FIG. 11 is a cross-sectional view taken along line XI-XI shown in FIG. 9.
- FIG. 12 is a cross-sectional view taken along line XII-XII shown in
- a plurality of trench gate structures 30 are formed on the first main surface 3 spaced apart from the trench isolation structures 20 in the device region 9 in this embodiment.
- the plurality of trench gate structures 30 are spaced apart in the second direction Y from a pair of trench isolation structures 20 (the first trench isolation structure 20A and the second trench isolation structure 20B) extending in the first direction X. formed. That is, the plurality of trench gate structures 30 have a first end portion 30 a on one side spaced apart in the second direction Y from the trench isolation structure 20 and a second end portion 30 a on the other side spaced apart in the second direction Y from the trench isolation structure 20 . Each has an end portion 30b.
- the distance between the trench isolation structure 20 and the trench gate structure 30 (both ends 30a and 30b) is preferably set within a range where the depletion layer covers the bottom wall of the trench isolation structure 20 and the bottom wall of the trench gate structure 30.
- a plurality of trench gate structures 30 may be formed at intervals of 0.1 ⁇ m or more and 2 ⁇ m or less (preferably 0.5 ⁇ m or more and 1.5 ⁇ m or less) from the trench isolation structure 20 in the second direction Y.
- the spacing between the trench isolation structures 20 and the trench gate structures 30 may be approximately equal to the spacing between the plurality of trench gate structures 30 .
- a plurality of dummy trench structures 40 are formed on the first main surface 3 spaced apart from the trench isolation structures 20 in the device region 9 in this embodiment. Specifically, the plurality of dummy trench structures 40 are spaced apart in the second direction Y from a pair of trench isolation structures 20 (the first trench isolation structure 20A and the second trench isolation structure 20B) extending in the first direction X. formed.
- the plurality of dummy trench structures 40 have a first end portion 40a on one side separated from the trench isolation structure 20 in the second direction Y and a second end portion 40a on the other side separated from the trench isolation structure 20 in the second direction Y. Each has an end portion 40b.
- the multiple dummy trench structures 40 are electrically isolated from the multiple trench gate structures 30 and the trench isolation structures 20 in this embodiment.
- a plurality of dummy trench structures 40 are formed in an electrically floating state in this form.
- the distance between the trench isolation structure 20 and the dummy trench structure 40 (both ends 40 a and 40 b ) is preferably set within a range where the depletion layer covers the bottom walls of the trench isolation structure 20 and dummy trench structure 40 .
- the plurality of dummy trench structures 40 may be formed at intervals of 0.1 ⁇ m or more and 2 ⁇ m or less (preferably 0.5 ⁇ m or more and 1.5 ⁇ m or less) from the trench isolation structure 20 in the second direction Y.
- the spacing between trench isolation structure 20 and dummy trench structure 40 is preferably substantially equal to the spacing between trench isolation structure 20 and trench gate structure 30 .
- the semiconductor device 1B includes a pair of mesa connection portions 51 that connect both end portions of a plurality of mesa portions 50 in the device region 9 .
- the pair of mesa connection portions 51 are divided into a region between the trench isolation structure 20 and the plurality of trench gate structures 30 and a region between the trench isolation structure 20 and the plurality of dummy trench structures 40, respectively.
- the pair of mesa connection portions 51 are each made up of a portion of the chip 2 and include the first region 6 and the second region 7 respectively.
- the pair of mesa connection portions 51 extends in a strip shape in a direction (first direction X) intersecting (more specifically, perpendicular to) the extending direction (second direction Y) of the plurality of mesa portions 50 in plan view.
- the pair of mesa connection portions 51 specifically includes a plurality of pairs of first mesa connection portions 51A, a plurality of pairs of second mesa connection portions 51B, and a plurality of third mesa connection portions 51C.
- a pair of first mesa connection portions 51A connect both ends of first mesa portions 50A adjacent in the first direction X to each other.
- the pair of first mesa connection portions 51A form one annular mesa portion surrounding the pair of first mesa portions 50A and one trench gate structure 30 in plan view.
- the plurality of pairs of first mesa connection portions 51A are integrally formed in the first direction X. As shown in FIG. Thus, the plurality of pairs of first mesa connection portions 51A form a ladder-like mesa portion surrounding the plurality of first mesa portions 50A and the plurality of trench gate structures 30 in plan view.
- a pair of second mesa connection portions 51B connect both end portions of the first mesa portion 50A and the second mesa portion 50B adjacent in the first direction X.
- the pair of second mesa connection portions 51B form one annular mesa portion surrounding one trench gate structure 30 together with the first mesa portion 50A and the second mesa portion 50B adjacent in the first direction X in plan view.
- the plurality of pairs of second mesa connection portions 51B are formed in the first direction X integrally with the plurality of pairs of first mesa connection portions 51A.
- the plurality of pairs of second mesa connection portions 51B form the plurality of pairs of first mesa connection portions 51A, the plurality of first mesa portions 50A, the plurality of second mesa portions 50B, and the plurality of trench gate structures 30 in plan view. It forms a surrounding ladder-like mesa.
- a pair of third mesa connection portions 51C connect both end portions of the second mesa portion 50B and the third mesa portion 50C adjacent in the first direction X.
- the pair of third mesa connection portions 51C form one annular mesa portion surrounding one dummy trench structure 40 together with the second mesa portion 50B and the third mesa portion 50C adjacent in the first direction X in plan view.
- the plurality of pairs of third mesa connection portions 51C are integrally formed in the first direction X with the plurality of pairs of first mesa connection portions 51A and the plurality of pairs of second mesa connection portions 51B.
- the plurality of pairs of third mesa connection portions 51C are divided into the plurality of pairs of first mesa connection portions 51A, the plurality of pairs of second mesa connection portions 51B, the plurality of first mesa portions 50A, and the plurality of second mesa connection portions 50A in plan view.
- a ladder-like mesa portion is formed surrounding the portion 50B, the plurality of trench gate structures 30 and the plurality of dummy trench structures 40 .
- the plurality of inner diodes D1 are electrically connected to each other via a pair of mesa connection portions 51 (specifically, first and second mesa connection portions 51A and 51B). That is, the plurality of inner diodes D1 are formed in an annular shape (in this form, a square annular shape) surrounding the plurality of trench gate structures 30 within the device region 9 .
- the outer diode D2 is electrically isolated from the plurality of inner diodes D1 by trench isolation structures 20, as in the first embodiment described above.
- the plurality of intermediate diodes D3 are electrically connected to the plurality of inner diodes D1 via a pair of mesa connection portions 51 (specifically, first to third mesa connection portions 51A to 51C). . That is, the plurality of intermediate diodes D3 are formed in a ring shape (in this embodiment, a square ring shape) surrounding the plurality of dummy trench structures 40 together with the plurality of inner diodes D1 within the device region 9 . Also, in this embodiment, the intermediate diodes D3 are electrically connected between the source and the drain in the same manner as the inner diodes D1, and function as body diodes of the MISFET.
- the field insulating film 70 covers a plurality of mesa connection portions 51 in the device region 9 in this form.
- the field insulating film 70 continues to the gate insulating film 32 (lower insulating film 34 ) of the plurality of trench gate structures 30 and the dummy insulating film 42 (buried insulator 44 ) of the plurality of dummy trench structures 40 at the plurality of mesa connection portions 51 . ing.
- the plurality of via electrodes 80 includes, in this embodiment, a plurality of third source via electrodes 84 penetrating through the interlayer insulating film 72 and electrically connected to the corresponding plurality of lead portions 39 of the trench gate structure 30 .
- the plurality of third source via electrodes 84 are arranged at intervals in the first direction X and the second direction Y in plan view, and are opposed to each other in the first direction X and the second direction Y. As shown in FIG.
- the connecting positions of the plurality of third source via electrodes 84 to the plurality of lead portions 39 are arbitrary.
- the plurality of third source via electrodes 84 do not necessarily have to be arranged on the same line extending in the first direction X in plan view, and may be arranged in the second direction Y so as to be shifted from each other.
- the source finger electrodes 95 are connected to the plurality of second source via electrodes 83 and the plurality of third source via electrodes 84 in this embodiment.
- the source finger electrodes 95 apply the source potential applied to the source pad electrode 94 to the plurality of second source via electrodes 83 and the plurality of third source via electrodes 84 .
- the source potentials applied to the plurality of second source via electrodes 83 are applied to the isolation electrodes 23 .
- the source potentials applied to the plurality of third source via electrodes 84 are applied to the lower electrodes 36 of the plurality of trench gate structures 30 via the plurality of lead portions 39 .
- the semiconductor device 1B also achieves the same effects as those described for the semiconductor device 1A.
- FIG. 14 corresponds to FIG. 2 and is a plan view showing the structure of the first main surface 3 of the chip 2 of the semiconductor device 1C according to the third embodiment.
- semiconductor device 1C includes a plurality (four in this embodiment) of device regions 9 (inner regions) set in the inner portion of first main surface 3 .
- the four device regions 9 include a first device region 9A, a second device region 9B, a third device region 9C and a fourth device region 9D.
- the number and arrangement of the device regions 9 are arbitrary, and are adjusted according to the size of the first main surface 3 and the electrical characteristics of the MISFET to be achieved. Below, one arrangement example of the plurality of device regions 9 will be described.
- the first device region 9A is set along a corner connecting the first side surface 5A and the third side surface 5C in plan view.
- regions are set to square shape in planar view.
- the second device region 9B is set along a corner connecting the second side surface 5B and the third side surface 5C with a gap in the second direction Y from the first device region 9A in plan view.
- the third device area 9C is set along a corner connecting the first side surface 5A and the fourth side surface 5D with a gap in the first direction X from the first device area 9A.
- the third device region 9C is set to have a rectangular shape that is larger than the first and second device regions 9A and 9B in plan view. In this form, the third device region 9C faces the first device region 9A in the first direction X in plan view, and does not face the second device region 9B.
- a fourth device region 9D is spaced in the first direction X from the second device region 9B and spaced in the second direction Y from the third device region 9C at a corner connecting the second side 5B and the fourth side 5D. set along the part.
- the fourth device region 9D is set to have a rectangular shape that is larger than the first and second device regions 9A and 9B in plan view. In this form, the fourth device region 9D faces the second device region 9B in the first direction X in plan view, and does not face the first device region 9A.
- the outer region 10 includes an annular region 10a, a pad region 10b and an intermediate region 10c in this form.
- the annular region 10a is set in an annular shape (specifically, a square annular shape) extending along the peripheral edges (first to fourth side surfaces 5A to 5D) of the first main surface 3 in plan view, and a plurality of devices It surrounds the area 9 collectively.
- the pad region 10b is set in a region between the first device region 9A and the second device region 9B in plan view, and extends from a portion of the annular region 10a along the central portion of the third side surface 5C to the fourth side surface. Projecting towards 5D.
- the pad area 10b is set to have a square shape in plan view.
- the intermediate area 10c is set in an area between the plurality of device areas 9 in plan view.
- the intermediate region 10c is set in a strip shape having a portion extending in the first direction X and a portion extending in the second direction Y in this embodiment.
- the semiconductor device 1C includes two device regions 9 spaced apart in the first direction X or the second direction Y, the intermediate region 10c is set in a band shape extending in the first direction X or the second direction Y.
- a plurality of device regions 9 are respectively surrounded by a plurality of trench isolation structures 20 described above and partitioned from the outer region 10 respectively. That is, the plurality of trench isolation structures 20, as in the case of the above-described first embodiment, divides the second region 7 into a plurality of portions (plurality of first body regions 7A) located within the plurality of device regions 9, And, it is separated into a portion (second body region 7B) located in the outer region 10 .
- the plurality of device regions 9 includes the plurality of trench gate structures 30, the plurality of dummy trench structures 40, the plurality of inner diodes D1, the plurality of intermediate diodes D3, the plurality of source regions 60, the plurality of contact holes 61, the plurality of A contact region 62, a field insulating film 70, a main surface insulating film 71, an interlayer insulating film 72, a plurality of gate via electrodes 81, a plurality of first source via electrodes 82 and a plurality of second source via electrodes 83 are formed.
- each trench isolation structure 20 is adjusted according to the planar shape of each device region 9 .
- the number of trench gate structures 30 formed in each device region 9 is arbitrary and adjusted according to the size of each device region 9 .
- a plurality of trench gate structures 30 extend in different directions (first direction X or second direction Y) in the plurality of device regions 9 in this embodiment.
- the plurality of dummy trench structures 40 extend along the plurality of trench gate structures 30 within each device region 9 and extend along both sides of the plurality of trench gate structures 30 in the first direction X or both sides in the second direction Y. sandwiched from the sides.
- a plurality of trench gate structures 30 are arranged at intervals in the first direction X in plan view, and are formed in strips extending in the second direction Y, respectively. That is, in the first device region 9A, a plurality of trench gate structures 30 are arranged in stripes extending in the second direction Y in plan view.
- a plurality of trench gate structures 30 are arranged at intervals in the second direction Y in plan view, and are formed in strips extending in the first direction X, respectively. That is, in the second device region 9B, a plurality of trench gate structures 30 are arranged in stripes extending in the first direction X in plan view.
- a plurality of trench gate structures 30 are arranged in stripes extending in the first direction X in plan view, similar to the second device region 9B.
- a plurality of trench gate structures 30 are arranged in stripes extending in the second direction Y, similar to the first device region 9A.
- the plurality of trench gate structures 30 extend in directions different from each other in the first device region 9A and the second device region 9B facing the second direction Y. Also, the plurality of trench gate structures 30 extend in directions different from each other in the third device region 9C and the fourth device region 9D facing the second direction Y. As shown in FIG. Also, the plurality of trench gate structures 30 extend in directions different from each other in the first device region 9A and the third device region 9C facing in the first direction X. As shown in FIG. Also, the plurality of trench gate structures 30 extend in directions different from each other in the second device region 9B and the fourth device region 9D that face each other in the first direction X. As shown in FIG.
- the plurality of trench gate structures 30 extend in one direction in the first device region 9A and the fourth device region 9D facing each other in one diagonal direction of the first main surface 3, and extend in another direction in the first main surface 3. It extends in a cross direction crossing one direction in the second device region 9B and the third device region 9C that are diagonally opposed to each other.
- the semiconductor device 1C has at least one trench gate structure 30 extending in the first direction X and crossing the first direction X (specifically at least one trench gate structure 30 extending in a second direction Y which is perpendicular to the direction Y). At least one trench gate structure 30 extending in the first direction X faces at least one trench gate structure 30 extending in the first direction X in one or both of the first direction X and the second direction Y. good too.
- At least one trench gate structure 30 extending in the second direction Y faces at least one trench gate structure 30 extending in the second direction Y in one or both of the first direction X and the second direction Y. good too. At least one trench gate structure 30 extending in the second direction Y faces at least one trench gate structure 30 extending in the first direction X in one or both of the first direction X and the second direction Y. good too.
- the outer diode D2 has a first region 6 and a second region 7 (second body region 7B) located in regions (outer regions 10) outside the device regions 9 . That is, the outer diode D2 is formed in the annular region 10a, the pad region 10b and the intermediate region 10c in this embodiment. That is, the outer diode D2 is formed in an annular shape that collectively surrounds the plurality of device regions 9 in plan view.
- the outer diode D2 is formed in a ring shape that individually surrounds the plurality of device regions 9 in plan view.
- the outer diode D2 may be exposed from at least one of the first to fourth side surfaces 5A to 5D as in the first embodiment.
- the outer diode D2 is formed in the entire region outside the plurality of device regions 9 on the first main surface 3 in this embodiment.
- the field insulating film 70 covers the outer diode D2 in the annular region 10a, the pad region 10b and the intermediate region 10c of the outer region 10 in this form.
- the field insulating film 70 preferably covers the entire outer diode D2.
- field insulating film 70 may partially cover outer diode D2, and main surface insulating film 71 may cover the portion exposed from field insulating film 70 in outer diode D2.
- the gate pad electrode 91 is arranged on the interlayer insulating film 72 in the same manner as in the first embodiment.
- the gate finger electrodes 92 are formed in strips across the plurality of device regions 9 so as to intersect (specifically, perpendicularly) the plurality of trench gate structures 30 arranged in the plurality of device regions 9 in plan view. formed.
- the gate finger electrodes 92 are electrically connected to the trench gate structures 30 (upper electrodes 37 ) through the gate via electrodes 81 in the device regions 9 .
- the manner in which the gate finger electrodes 92 are routed is arbitrary.
- the source pad electrode 94 is arranged in a region partitioned by the gate wiring electrode 90 in plan view, and overlaps the plurality of device regions 9 .
- the source pad electrode 94 is connected to the multiple first source via electrodes 82 .
- the source pad electrode 94 is electrically connected to the second region 7 , the plurality of source regions 60 and the plurality of contact regions 62 via the plurality of first source via electrodes 82 in the plurality of device regions 9 .
- the source finger electrodes 95 are formed in strips extending along the plurality of trench isolation structures 20 arranged in the plurality of device regions 9 in plan view.
- the source finger electrodes 95 are electrically connected to the multiple isolation electrodes 23 via the multiple second source via electrodes 83 in the multiple device regions 9 .
- the manner in which the source finger electrodes 95 are routed is arbitrary.
- a plurality of device regions 9 are electrically connected to the gate wiring electrode 90, the source wiring electrode 93 and the drain electrode 96, respectively. That is, the functional devices (MISFETs and inner diodes D1) formed in a plurality of device regions 9 are driven and controlled at the same timing. As described above, the semiconductor device 1C also exhibits the same effects as those described for the semiconductor device 1A.
- the trench gate structure 30 according to the second embodiment described above may be applied to the semiconductor device 1C according to the third embodiment.
- the source wiring electrode 93 is electrically connected to the first to third source via electrodes 82 to 84 in the multiple device regions 9 .
- FIG. 15 is a sectional view showing a modification of the second region 7, which corresponds to FIG. 5 and is applied to the first to third embodiments.
- FIG. 15 shows an example in which the second region 7 according to the modification is applied to the semiconductor device 1A according to the first embodiment. It can also be applied to morphology.
- the second region 7 according to the first embodiment is exposed from the first to fourth side surfaces 5A to 5D.
- the second region 7 according to the modified example is spaced apart from the first to fourth side surfaces 5A to 5D and is the surface layer portion of the first main surface 3 (first region 6). is formed in That is, the second region 7 exposes the first region 6 from the peripheral portion of the first principal surface 3 .
- the outer diode D2 is formed in the outer region 10 spaced apart from the first to fourth side surfaces 5A to 5D in this embodiment.
- FIG. 16 is a plan view corresponding to FIG. 3 and showing a first modification of the dummy trench structure 40 applied to the first to third embodiments.
- 17 is a cross-sectional view taken along line XVII-XVII shown in FIG. 16.
- FIG. 16 and 17 show an example in which the dummy trench structure 40 according to the first modification is applied to the semiconductor device 1A according to the first embodiment, but the dummy trench structure 40 according to the first modification is It can also be applied to the second and third embodiments.
- the dummy trench structure 40 according to the first embodiment has an internal structure different from the internal structure of the trench isolation structure 20 and the internal structure of the trench gate structure 30 .
- the dummy trench structure 40 according to the first modification has an internal structure similar to that of the trench gate structure 30 and an internal structure different from that of the trench isolation structure 20 .
- the dummy trench structure 40 according to the first modification does not have a buried insulator 44 and includes dummy trenches 41 , dummy insulating films 42 and dummy electrodes 43 .
- Dummy trench 41 , dummy insulating film 42 and dummy electrode 43 are formed in the same manner as gate trench 31 , gate insulating film 32 and gate electrode 33 .
- the dummy insulating film 42 includes a dummy lower insulating film 100 and a dummy upper insulating film 101 corresponding to the lower insulating film 34 and the upper insulating film 35 of the gate insulating film 32, respectively.
- Dummy electrode 43 includes dummy lower electrode 102, dummy upper electrode 103 and dummy intermediate insulating film 104 corresponding to lower electrode 36, upper electrode 37 and intermediate insulating film 38 of gate electrode 33, respectively.
- the dummy lower electrode 102 has a plurality of dummy lead portions 105 corresponding to the plurality of lead portions 39 of the lower electrode 36 .
- the dummy lower electrode 102 (dummy lead-out portion 105) is electrically connected to the isolation electrode 23 of the trench isolation structure 20, and the dummy upper electrode 103 is formed in an electrically floating state.
- FIG. 18 is a cross-sectional view corresponding to FIG. 5 and showing a second modification of the dummy trench structure 40 applied to the first to third embodiments.
- FIG. 18 shows an example in which the dummy trench structure 40 according to the second modification is applied to the semiconductor device 1A according to the first embodiment. It can also be applied to the third embodiment.
- the dummy trench structure 40 according to the second modification has an internal structure similar to that of the trench isolation structure 20 and an internal structure different from that of the trench gate structure 30 .
- the dummy trench structure 40 according to the second modification does not have a buried insulator 44 and includes dummy trenches 41 , dummy insulating films 42 and dummy electrodes 43 .
- the dummy insulating film 42 and the dummy electrode 43 are formed in the same manner as the isolation insulating film 22 and the isolation electrode 23 .
- Dummy electrode 107 is electrically connected to isolation electrode 23 at the communicating portion of isolation trench 21 and dummy trench 41 .
- FIG. 19 is a sectional view corresponding to FIG. 3 and showing a modification of the device region 9 applied to the first to third embodiments.
- FIG. 19 shows an example in which the device region 9 according to the modification is applied to the semiconductor device 1A according to the first embodiment. can also be applied.
- a plurality of dummy trench structures 40 are formed in the device region 9 according to the first embodiment.
- dummy trench structure 40 is not formed in device region 9 according to the modification. Therefore, the outermost trench gate structure 30 faces the trench isolation structure 20 in the first direction X with one mesa portion 50 interposed therebetween.
- each of the above-described embodiments can be implemented in other forms.
- the pad region 10b of the outer region 10 (the curved portion 9a of the device region 9/the curved portion 20E of the trench isolation structure 20) is set in the central portion of the third side surface 5C in plan view. shown.
- the arrangement of the pad region 10b is arbitrary.
- pad region 10b (bending portion 9a/trench bending portion 20E) may be arranged in a region along any corner of first main surface 3 in plan view.
- the plurality of source regions 60 were formed only in the plurality of first mesa portions 50A and not formed in the plurality of second to third mesa portions 50B to 50C.
- the plurality of source regions 60 may be formed in any one or both of the plurality of second to third mesa portions 50B to 50C.
- the gate wiring electrode 90 is formed separately from the plurality of gate via electrodes 81 .
- part of the gate wiring electrode 90 may be formed as a plurality of gate via electrodes 81 . That is, the gate wiring electrode 90 may include a plurality of gate via electrodes 81 penetrating through the interlayer insulating film 72 .
- the source wiring electrode 93 is formed separately from the plurality of first to third source via electrodes 82 to 84 .
- part of the source wiring electrode 93 may be formed as a plurality of first to third source via electrodes 82 to 84 penetrating the interlayer insulating film 72 . That is, the source wiring electrode 93 may include a plurality of first to third source via electrodes 82 to 84 penetrating the interlayer insulating film 72 .
- the source potential is applied to the lower electrode 26 of the trench gate structure 30 .
- a gate potential may be applied to the lower electrode 26 of the trench gate structure 30 .
- the third source via electrode 84 may be changed to a gate via electrode, and the gate finger electrode 92 may be electrically connected to the gate via electrode.
- the inner diode D1 and the intermediate diode D3 are electrically isolated from the bottom electrode 26.
- trench gate structure 30 has a structure different from that of the trench isolation structure 20 was shown.
- trench gate structure 30 may have an internal structure similar to trench isolation structure 20 (ie, a single electrode structure).
- the gate insulating film 32 and the gate electrode 33 are formed in the same manner as the isolation insulating film 22 and the isolation electrode 23 .
- first conductivity type is the “n type” and the “second conductivity type” is the p type
- the "two-conductivity type” may be the "n-type.”
- a specific configuration in this case can be obtained by replacing "n-type region” with “p-type region” and "n-type region” with “p-type region” in the above description and accompanying drawings.
- the p-type third region 8 may be employed instead of the n-type third region 8 .
- an IGBT Insulated Gate Bipolar Transistor
- a specific configuration in this case is to replace the "source (impurity region)" of the MISFET with the “emitter (impurity region)" of the IGBT in the above description, and replace the "drain” of the MISFET with the "collector” of the IGBT.
- the chip 2 may consist of a WBG (Wide Band Gap) semiconductor chip.
- a WBG semiconductor is a semiconductor with a bandgap that exceeds that of silicon.
- the chip 2 may contain GaN (gallium nitride), SiC (silicon carbide), diamond, or the like as a WBG semiconductor.
- a chip having a main surface, a first region of a first conductivity type formed on a surface layer of the main surface, and a second region of a second conductivity type formed on a surface layer of the first region.
- a trench that penetrates through the second region surrounds the inner side of the second region, and defines an inner region on the inner side of the second region and an outer region on the outer side of the second region on the main surface.
- an isolation structure a trench gate structure formed in the inner region so as to penetrate the second region, an inner diode including the first region and the second region located in the inner region, and an inner diode in the outer region. an outer diode electrically isolated from the trench gate structure and the inner diode by the trench isolation structure, comprising the first region and the second region located thereon.
- trench gate structure has a multi-electrode structure including a lower electrode and an upper electrode vertically separated and embedded in the gate trench.
- A12 The semiconductor device according to any one of A1 to A11, further including a first conductivity type impurity region formed in a surface layer portion of the second region so as to be in contact with the trench gate structure in the inner region.
- A14 Further including a dummy trench structure formed in a region between the trench isolation structure and the trench gate structure in the inner region so as to penetrate the second region and electrically isolated from the trench gate structure. , A1 to A13.
- A15 Further an intermediate diode including the first region and the second region located between the trench isolation structure and the dummy trench structure and electrically isolated from the outer diode by the trench isolation structure
- the semiconductor device of A14 comprising:
- the dummy trench structure includes a dummy electrode embedded in the bottom side of the dummy trench and an insulator embedded in the opening of the dummy trench.
- a chip having a main surface, a trench isolation structure on the main surface extending in a first direction, and a trench isolation structure formed on the main surface to extend in a second direction intersecting the first direction, the trench isolation a trench gate structure partitioning a structure and a mesa; a first body region formed in the surface layer of the main surface within the mesa; and a trench isolation formed outside the mesa in the surface layer of the main surface. a second body region electrically separated from the trench gate structure and the first body region by a structure.
- a pair of trench isolation structures are arranged on the main surface at intervals in the second direction, the trench gate structure is formed in a region sandwiched between the pair of trench isolation structures, and a pair of The semiconductor device according to any one of B1 to B5, wherein the trench isolation structure and the mesa portion are separated.
- a pair of trench gate structures are arranged with a gap in the first direction in a region sandwiched between the pair of trench isolation structures, and partition the pair of trench isolation structures and the mesa portion. , B6.
- a chip having a main surface, a trench isolation structure formed on the main surface, a trench gate structure formed on the main surface at a distance from the trench isolation structure, the trench gate structure and the trench a dummy trench structure formed on the main surface so as to be interposed between isolation structures and electrically separated from the trench gate structure; and a region in the chip between the trench gate structure and the dummy trench structure.
- an intermediate diode formed in a region between the trench isolation structure and the dummy trench structure within the chip; and the dummy trench structure relative to the trench isolation structure within the chip.
- an outer diode formed in opposite regions and electrically isolated from the inner diode and the intermediate diode.
- a chip (2) having a main surface (3), a trench isolation structure (20) defining one region (9) and the other region (10) on the main surface (3), and the one region (9 ) and a first diode (D1, D3) formed in said other region (10) and separated by said trench isolation structure (20). ), a semiconductor device (1A, 1B, 1C) including a second diode (D2) electrically isolated from the semiconductor device (1A, 1B, 1C).
- the first diode (D1, D3) has a first anode and a first cathode
- the second diode (D2) has an electrically open second anode and the first cathode.
- the first diode (D1, D3) has a first anode and a first cathode
- the second diode (D1, D3) has a second anode electrically connected to the first anode.
- a second cathode electrically connected to said first cathode
- said third diode (D2) having an electrically open third anode and said first cathode and said second cathode
- a semiconductor device (1C) according to any one of E1-E4, comprising a third cathode electrically connected to the cathode.
- the outer regions (10: 10a, 10b, 10c) surround the first device regions (9: 9A to 9D) and the second device regions (9: 9A to 9D) in plan view, 3 diodes (D2) according to any one of E1 to E5, surrounding the first device region (9:9A-9D) and the second device region (9:9A-9D) in plan view semiconductor device (1C).
- the chip (2) has side surfaces (5A-5D), and the third diode (D2) is exposed from the side surfaces (5A-5D) of the chip (2), E1- The semiconductor device (1C) according to any one of E6.
- the semiconductor device (1C) according to any one of E1 to E7, which is a two-body diode.
- the first transistor has a plurality of first gate structures (30) arranged in stripes extending in one direction, and the second transistors (MISFET) cross the one direction.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Element Separation (AREA)
- Electrodes Of Semiconductors (AREA)
Abstract
Description
1B 半導体装置
1C 半導体装置
2 チップ
3 第1主面
5A 第1側面
5B 第2側面
5C 第3側面
5D 第4側面
6 第1領域
7 第2領域
7A 第1ボディ領域
7B 第2ボディ領域
9 デバイス領域(内領域)
10 外領域
20 トレンチ分離構造
21 分離トレンチ
23 分離電極
30 トレンチゲート構造
31 ゲートトレンチ
36 下電極
37 上電極
40 ダミートレンチ構造
41 ダミートレンチ
43 ダミー電極
44 埋設絶縁体
50 メサ部
60 ソース領域(不純物領域)
D1 内側ダイオード
D2 外側ダイオード
D3 中間ダイオード
X 第1方向
Y 第2方向
Claims (20)
- 主面を有するチップと、
前記主面の表層部に形成された第1導電型の第1領域と、
前記第1領域の表層部に形成された第2導電型の第2領域と、
前記第2領域を貫通し、前記第2領域の内方を取り囲み、前記主面に前記第2領域の内方側の内領域および前記第2領域の外方側の外領域を区画するトレンチ分離構造と、
前記第2領域を貫通するように前記内領域に形成されたトレンチゲート構造と、
前記内領域に位置する前記第1領域および前記第2領域を含む内側ダイオードと、
前記外領域に位置する前記第1領域および前記第2領域を含み、前記トレンチ分離構造によって前記トレンチゲート構造および前記内側ダイオードから電気的に切り離された外側ダイオードと、を含む、半導体装置。 - 前記外側ダイオードは、電気的に浮遊状態に形成された浮遊ダイオードからなる、請求項1に記載の半導体装置。
- 前記外側ダイオードは、平面視において前記トレンチ分離構造を取り囲んでいる、請求項1または2に記載の半導体装置。
- 前記チップは、側面を有し、
前記外側ダイオードは、前記チップの前記側面から露出している、請求項1~3のいずれか一項に記載の半導体装置。 - 前記トレンチゲート構造は、ゲートトレンチ内に上下方向に分離埋設された下電極および上電極を含むマルチ電極構造を有し、
前記内側ダイオードの前記第2領域は、前記下電極に電気的に接続されている、請求項1~4のいずれか一項に記載の半導体装置。 - 複数の前記トレンチゲート構造が、前記内領域にストライプ状に配列されている、請求項1~5のいずれか一項に記載の半導体装置。
- 前記トレンチ分離構造は、分離トレンチ内に埋設された分離電極を含み、
前記内側ダイオードの前記第2領域は、前記分離電極に電気的に接続されている、請求項1~6のいずれか一項に記載の半導体装置。 - 前記トレンチ分離構造は、単一の前記分離電極を含むシングル電極構造を有している、請求項7に記載の半導体装置。
- 前記内領域において前記トレンチゲート構造に接するように前記第2領域の表層部に形成された第1導電型の不純物領域をさらに含む、請求項1~8のいずれか一項に記載の半導体装置。
- 前記不純物領域は、前記トレンチ分離構造に接しないように前記トレンチ分離構造から間隔を空けて形成されている、請求項9に記載の半導体装置。
- 前記内領域における前記トレンチ分離構造および前記トレンチゲート構造の間の領域に前記第2領域を貫通するように形成され、前記トレンチゲート構造から電気的に切り離されたダミートレンチ構造をさらに含む、請求項1~10のいずれか一項に記載の半導体装置。
- 前記トレンチ分離構造および前記ダミートレンチ構造の間の領域に位置する前記第1領域および前記第2領域を含み、前記トレンチ分離構造によって前記外側ダイオードから電気的に切り離された中間ダイオードをさらに含む、請求項11に記載の半導体装置。
- 前記ダミートレンチ構造は、前記トレンチゲート構造とは異なる内部構造を有している、請求項11または12に記載の半導体装置。
- 前記ダミートレンチ構造は、前記トレンチ分離構造とは異なる内部構造を有している、請求項11~13のいずれか一項に記載の半導体装置。
- 前記ダミートレンチ構造は、ダミートレンチの底側に埋設されたダミー電極、および、前記ダミートレンチの開口側に埋設された絶縁体を含む、請求項11~14のいずれか一項に記載の半導体装置。
- 前記ダミートレンチ構造は、前記ダミートレンチ内において前記絶縁体を挟んで前記ダミー電極に対向する電極を含まない、請求項15に記載の半導体装置。
- 主面を有するチップと、
第1方向に延びるように前記主面に形成されたトレンチ分離構造と、
前記第1方向に交差する第2方向に延びるように前記主面に形成され、前記トレンチ分離構造とメサ部を区画するトレンチゲート構造と、
前記メサ部内において前記主面の表層部に形成された第1ボディ領域と、
前記メサ部外において前記主面の表層部に形成され、前記トレンチ分離構造によって前記トレンチゲート構造および前記第1ボディ領域から電気的に切り離された第2ボディ領域と、を含む、半導体装置。 - 前記第1ボディ領域には、ソース電位が付与され、
前記第2ボディ領域は、電気的に浮遊状態に形成されている、請求項17に記載の半導体装置。 - 一対の前記トレンチ分離構造が、前記第2方向に間隔を空けて前記主面に配列され、
前記トレンチゲート構造は、一対の前記トレンチ分離構造に挟まれた領域に形成され、一対の前記トレンチ分離構造と前記メサ部を区画し、
前記第2ボディ領域は、前記メサ部外において一対の前記トレンチ分離構造の双方に接している、請求項17または18に記載の半導体装置。 - 前記チップは、側面を有し、
前記第2ボディ領域は、前記側面から露出している、請求項17~19のいずれか一項に記載の半導体装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2023508795A JPWO2022202009A1 (ja) | 2021-03-26 | 2022-02-18 | |
CN202280024206.0A CN117083720A (zh) | 2021-03-26 | 2022-02-18 | 半导体装置 |
DE112022001150.5T DE112022001150T5 (de) | 2021-03-26 | 2022-02-18 | Halbleiterbauteil |
US18/473,344 US20240014313A1 (en) | 2021-03-26 | 2023-09-25 | Semiconductor device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021053752 | 2021-03-26 | ||
JP2021-053752 | 2021-03-26 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US18/473,344 Continuation US20240014313A1 (en) | 2021-03-26 | 2023-09-25 | Semiconductor device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022202009A1 true WO2022202009A1 (ja) | 2022-09-29 |
Family
ID=83396853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/006617 WO2022202009A1 (ja) | 2021-03-26 | 2022-02-18 | 半導体装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20240014313A1 (ja) |
JP (1) | JPWO2022202009A1 (ja) |
CN (1) | CN117083720A (ja) |
DE (1) | DE112022001150T5 (ja) |
WO (1) | WO2022202009A1 (ja) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008085086A (ja) * | 2006-09-27 | 2008-04-10 | Toyota Industries Corp | 半導体装置 |
JP2013033931A (ja) * | 2011-06-08 | 2013-02-14 | Rohm Co Ltd | 半導体装置およびその製造方法 |
JP2018125490A (ja) * | 2017-02-03 | 2018-08-09 | 株式会社デンソー | 半導体装置 |
JP2018186111A (ja) * | 2017-04-24 | 2018-11-22 | 三菱電機株式会社 | 半導体装置及び半導体装置の製造方法 |
JP2019054071A (ja) * | 2017-09-14 | 2019-04-04 | 株式会社東芝 | 半導体装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011199109A (ja) | 2010-03-23 | 2011-10-06 | Renesas Electronics Corp | パワーmosfet |
JP7266214B2 (ja) | 2019-09-30 | 2023-04-28 | パナソニックIpマネジメント株式会社 | 電動工具、及び電池パック |
-
2022
- 2022-02-18 JP JP2023508795A patent/JPWO2022202009A1/ja active Pending
- 2022-02-18 CN CN202280024206.0A patent/CN117083720A/zh active Pending
- 2022-02-18 DE DE112022001150.5T patent/DE112022001150T5/de active Pending
- 2022-02-18 WO PCT/JP2022/006617 patent/WO2022202009A1/ja active Application Filing
-
2023
- 2023-09-25 US US18/473,344 patent/US20240014313A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008085086A (ja) * | 2006-09-27 | 2008-04-10 | Toyota Industries Corp | 半導体装置 |
JP2013033931A (ja) * | 2011-06-08 | 2013-02-14 | Rohm Co Ltd | 半導体装置およびその製造方法 |
JP2018125490A (ja) * | 2017-02-03 | 2018-08-09 | 株式会社デンソー | 半導体装置 |
JP2018186111A (ja) * | 2017-04-24 | 2018-11-22 | 三菱電機株式会社 | 半導体装置及び半導体装置の製造方法 |
JP2019054071A (ja) * | 2017-09-14 | 2019-04-04 | 株式会社東芝 | 半導体装置 |
Also Published As
Publication number | Publication date |
---|---|
US20240014313A1 (en) | 2024-01-11 |
JPWO2022202009A1 (ja) | 2022-09-29 |
CN117083720A (zh) | 2023-11-17 |
DE112022001150T5 (de) | 2023-12-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6477885B2 (ja) | 半導体装置および半導体装置の製造方法 | |
CN109585537B (zh) | 半导体装置 | |
US8981471B2 (en) | Insulated gate semiconductor device | |
JP7407252B2 (ja) | 半導体装置 | |
US11444187B2 (en) | Insulated gate bipolar transistor and diode | |
WO2020149212A1 (ja) | 半導体装置およびその製造方法 | |
US11088276B2 (en) | Silicon carbide semiconductor device | |
JP2010232335A (ja) | 絶縁ゲートバイポーラトランジスタ | |
US11189703B2 (en) | Semiconductor device with trench structure having differing widths | |
US11664448B2 (en) | Semiconductor device | |
JP2019054043A (ja) | 半導体装置およびその製造方法 | |
WO2021157529A1 (ja) | 半導体装置 | |
JP2000277733A (ja) | 絶縁ゲート型電界効果トランジスタ | |
WO2022202009A1 (ja) | 半導体装置 | |
WO2022153693A1 (ja) | 半導体装置 | |
US20220216313A1 (en) | Semiconductor device | |
JP2023013277A (ja) | 半導体装置 | |
CN111834453A (zh) | 一种半导体器件及其制备方法 | |
WO2023189054A1 (ja) | 半導体装置 | |
WO2024014362A1 (ja) | 半導体装置 | |
WO2022201893A1 (ja) | 半導体装置 | |
WO2023189059A1 (ja) | 半導体装置 | |
US11538904B2 (en) | Semiconductor device | |
WO2022034828A1 (ja) | 半導体装置 | |
JP2023032332A (ja) | 半導体装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22774809 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2023508795 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280024206.0 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 112022001150 Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 22774809 Country of ref document: EP Kind code of ref document: A1 |