WO2015198468A1 - 炭化珪素半導体装置 - Google Patents
炭化珪素半導体装置 Download PDFInfo
- Publication number
- WO2015198468A1 WO2015198468A1 PCT/JP2014/067150 JP2014067150W WO2015198468A1 WO 2015198468 A1 WO2015198468 A1 WO 2015198468A1 JP 2014067150 W JP2014067150 W JP 2014067150W WO 2015198468 A1 WO2015198468 A1 WO 2015198468A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- region
- channel resistance
- silicon carbide
- impurity
- resistance adjustment
- Prior art date
Links
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 47
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 47
- 239000004065 semiconductor Substances 0.000 title claims description 30
- 239000012535 impurity Substances 0.000 claims abstract description 38
- 239000010410 layer Substances 0.000 claims abstract description 29
- 239000002344 surface layer Substances 0.000 claims abstract description 17
- 239000011229 interlayer Substances 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims description 14
- 150000002500 ions Chemical class 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract 1
- 108091006146 Channels Proteins 0.000 description 69
- 239000012141 concentrate Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000005684 electric field Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910005883 NiSi Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 108010075750 P-Type Calcium Channels Proteins 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide 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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02373—Group 14 semiconducting materials
- H01L21/02378—Silicon carbide
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/265—Bombardment with radiation with high-energy radiation producing ion implantation
- H01L21/26506—Bombardment with radiation with high-energy radiation producing ion implantation in group IV semiconductors
- H01L21/26513—Bombardment with radiation with high-energy radiation producing ion implantation in group IV semiconductors of electrically active species
-
- 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
- H01L29/02—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
- H01L29/08—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 with semiconductor regions connected to an electrode carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/0843—Source or drain regions of field-effect devices
- H01L29/0847—Source or drain regions of field-effect devices of field-effect transistors with insulated gate
- H01L29/0852—Source or drain regions of field-effect devices of field-effect transistors with insulated gate of DMOS transistors
- H01L29/0856—Source regions
- H01L29/086—Impurity concentration or distribution
-
- 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
- H01L29/10—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 with semiconductor regions connected to an electrode not carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/1025—Channel region of field-effect devices
- H01L29/1029—Channel region of field-effect devices of field-effect transistors
- H01L29/1033—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure
- H01L29/1041—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure with a non-uniform doping structure in the channel region surface
- H01L29/1045—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure with a non-uniform doping structure in the channel region surface the doping structure being parallel to the channel length, e.g. DMOS like
-
- 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
- H01L29/10—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 with semiconductor regions connected to an electrode not carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/1095—Body region, i.e. base region, of 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
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
-
- 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
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
- H01L29/1608—Silicon carbide
-
- 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
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
- H01L29/167—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table further characterised by the doping material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66053—Multistep manufacturing processes of devices having a semiconductor body comprising crystalline silicon carbide
- H01L29/66068—Multistep manufacturing processes of devices having a semiconductor body comprising crystalline silicon carbide the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
-
- 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]
-
- 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
Definitions
- the present invention relates to a silicon carbide semiconductor device used for an inverter device or the like.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a technique capable of reducing the on-resistance while suppressing a decrease in short-circuit resistance.
- a silicon carbide semiconductor device includes a first conductivity type epitaxial layer formed on an upper surface of a silicon carbide semiconductor substrate, and a second conductivity type partially formed in a surface layer of the epitaxial layer.
- An adjustment region a gate electrode formed on a top surface of the channel resistance adjustment region through a gate insulating film; an interlayer insulating film formed to cover the gate electrode; an upper surface of the interlayer insulating film; and the source region
- the region includes a first impurity region having a first conductivity type or a second impurity region having a second conductivity type in a direction intersecting a direction in which the source region and the epitaxial layer sandwich the channel resistance adjustment region.
- the impurity concentration of the first impurity region (6) is When the impurity concentration is higher than the impurity concentration of the epitaxial layer (2) and the channel resistance adjustment region is a region where the second impurity region (6a) is intermittently formed, the second impurity region (6a) The impurity concentration is higher than the impurity concentration of the well region (3).
- the on-resistance while suppressing a decrease in short-circuit tolerance. That is, in the surface layer of the well region, a region (channel resistance adjustment region) having a different carrier concentration is partially formed, so that current is locally concentrated in a region having a low channel resistance. Then, the portion where the current is concentrated generates heat locally, and the resistance increases, so that the flowing current is suppressed. For this reason, since a saturation current is suppressed as compared with a semiconductor device in which the carrier concentration in the channel portion is uniform and has the same on-resistance, the short-circuit tolerance is improved.
- FIG. 1 is a cross-sectional view showing the structure of the silicon carbide semiconductor device according to this embodiment.
- FIG. 1 is a cross-sectional view of a SiC-MOSFET chip including a channel resistance adjustment region.
- FIG. 2 is a top view showing the structure of the silicon carbide semiconductor device according to this embodiment.
- An SiC substrate 1 is used as the semiconductor substrate, and an n ⁇ type SiC epitaxial layer 2 that is epitaxially grown is formed on the upper surface of the n + type SiC substrate 1.
- a p-type well region 3 is partially (selectively) formed on the surface layer of the SiC epitaxial layer 2.
- An n-type source region 4 is partially (selectively) formed on the surface layer of the well region 3.
- a p-type contact region 5 is formed on the surface layer of the source region 4.
- a channel resistance adjustment region 6 is formed sandwiched between the source region 4 and the SiC epitaxial layer 2 in plan view.
- the gate electrode 7 is formed across a part of the upper surface of the source region 4, the upper surface of the channel resistance adjustment region 6, and the upper surface of the SiC epitaxial layer 2.
- the gate electrode 7 is made of, for example, polysilicon.
- the gate electrode 7 is formed via the gate insulating film 8.
- the gate insulating film 8 is made of, for example, silicon dioxide.
- an interlayer insulating film 9 is formed so as to cover the gate insulating film 8.
- the interlayer insulating film 9 is made of, for example, tetraethyl orthosilicate (TEOS).
- TEOS tetraethyl orthosilicate
- a source electrode 10 is formed on the upper surface of the interlayer insulating film 9 and the upper surface of the source region 4.
- the source electrode 10 is formed on the contact region 5 and the source region 4 via the NiSi layer 11.
- a drain electrode 12 is formed on the lower surface (back surface) of the SiC substrate 1.
- the channel resistance adjustment region There are two methods for forming the channel resistance adjustment region, a method of forming it as an n-type region as shown in FIGS. 1 and 2, and a method of forming a high-concentration p-type as shown in FIGS. There is a method of forming as a region.
- the channel resistance adjustment region 6 When formed as an n-type region, the channel resistance adjustment region 6 is of the first conductivity type (n-type) in a direction intersecting the direction in which the source region 4 and the SiC epitaxial layer 2 sandwich the channel resistance adjustment region 6.
- the impurity region (first impurity region) is a region formed intermittently.
- the channel resistance adjustment region 6a When formed as a p-type region, the channel resistance adjustment region 6a is of the second conductivity type (p-type) in the direction intersecting the direction in which the source region 4 and the SiC epitaxial layer 2 sandwich the channel resistance adjustment region 6a.
- the impurity region (second impurity region) is a region formed intermittently.
- FIG. 3 is a cross-sectional view showing another structure of the silicon carbide semiconductor device according to the present embodiment.
- FIG. 4 is a top view showing another structure of the silicon carbide semiconductor device according to the present embodiment.
- the channel resistance adjustment region 6 is formed as the n-type region shown in FIGS. 1 and 2, a region having a low channel resistance is locally formed in the MOSFET cell.
- the channel resistance adjustment region 6 is intermittently formed on the sides surrounding the source region 4 around the source region 4 in plan view.
- the channel resistance is reduced by forming the channel resistance adjustment region 6 in this way. Further, when a large current flows at the time of a short circuit, the current concentrates in the channel resistance adjustment region 6, and a portion where the current concentrates generates heat locally to increase the resistance, so that the flowing current is suppressed. For this reason, since the saturation current is suppressed as compared with a MOSFET having a uniform channel portion concentration and the same on-resistance, the short-circuit tolerance is improved.
- the channel resistance adjustment region 6 having a low channel resistance is formed at a corner other than the corner of each cell (the corner surrounding the source region 4) where the generated electric field is large (that is, the electric field is likely to concentrate). Is less likely to be destroyed.
- FIG. 1 and FIG. 2 exemplify a structure in which square cells are arranged, but a similar effect is produced even in a cell having a stripe structure.
- 1 and 2 show a structure in which the area between the square cells is formed in a lattice shape, and a p-type well region 3 is formed at a position where the lattice intersects.
- the well region 3 may not be formed at the intersecting position.
- the channel resistance adjustment region 6a is locally formed in the MOSFET cell.
- the channel resistance adjustment region 6 a is intermittently formed on the sides surrounding the source region 4 in the plan view and surrounding the four sides of the source region 4.
- the channel resistance adjustment region 6a By forming the channel resistance adjustment region 6a in this way, when a large current flows at the time of a short circuit, the current is concentrated outside the channel resistance adjustment region 6a, and the portion where the current is concentrated generates heat locally and the resistance is increased. Since it becomes high, the flowing current is suppressed. For this reason, since the saturation current is suppressed as compared with a MOSFET having a uniform channel portion concentration and the same on-resistance, the short-circuit tolerance is improved.
- the channel resistance adjustment region 6a having a high channel resistance is formed at the corner of each cell where the generated electric field is large (that is, the electric field is likely to concentrate) (the corner surrounding the source region 4). It becomes difficult to be destroyed.
- 3 and 4 exemplify a structure in which square cells are arranged, the same effect can be obtained even in a cell having a stripe structure.
- 3 and 4 show a structure in which the area between each square cell is formed in a lattice shape, and a p-type well region 3 is formed at a position where the lattice intersects.
- the well region 3 may not be formed at the intersecting position.
- the material doped in the channel resistance adjustment region is Al or N.
- the dose amount is about 1 ⁇ 10 12 [N / cm 2 ] or more, preferably 1 ⁇ 10 14 [N / cm 2 ] or more, which is higher than the impurity concentration of the well region 3. It is. Further, in the case of N, the concentration is about 5 ⁇ 10 13 [N / cm 2 ] or less, which is higher than the impurity concentration of the SiC epitaxial layer 2.
- n + type substrate is a p-type substrate, it becomes an insulated gate bipolar transistor (IGBT), and the effect of the present invention can be obtained in the same way with an IGBT.
- IGBT insulated gate bipolar transistor
- FIG. 5 is a top view showing a structure of a modified example of the silicon carbide semiconductor device according to the present embodiment.
- FIG. 6 is a cross-sectional view showing the structure of a modification of the silicon carbide semiconductor device according to this embodiment.
- FIGS. 5 and 6 show the case where the channel resistance adjustment region 6b is formed as an n-type region in a cell having a stripe structure (a cell in which the well region 3 and the source region 4 have a stripe shape in plan view). Yes.
- the channel resistance adjustment region 6b is formed as the n-type region shown in FIGS. 5 and 6, a region having a low channel resistance is locally formed in the MOSFET cell.
- the channel resistance adjustment region 6b is intermittently formed surrounding the source region 4 in plan view.
- the channel resistance is reduced by forming the channel resistance adjustment region 6b.
- the current concentrates in the channel resistance adjustment region 6b, and the portion where the current concentrates locally generates heat and the resistance increases, so that the flowing current is suppressed. For this reason, since the saturation current is suppressed as compared with a MOSFET having a uniform channel portion concentration and the same on-resistance, the short-circuit tolerance is improved.
- the channel resistance adjustment region 6b having a low channel resistance is formed in a region other than the corner of each cell where the generated electric field is large, so that the element is not easily destroyed at the time of a short circuit.
- the silicon carbide semiconductor device includes a first conductivity type SiC epitaxial layer 2, a second conductivity type well region 3, a first conductivity type source region 4, a channel resistance adjustment region 6 or A channel resistance adjustment region 6a, a gate electrode 7, an interlayer insulating film 9, a source electrode 10, and a drain electrode 12 are provided.
- the SiC epitaxial layer 2 is formed on the upper surface of the SiC substrate 1.
- Well region 3 is partially formed in the surface layer of SiC epitaxial layer 2.
- the source region 4 is partially formed on the surface layer of the well region 3.
- Channel resistance adjustment region 6 and channel resistance adjustment region 6 a are formed in the surface layer of well region 3 and sandwiched between source region 4 and SiC epitaxial layer 2.
- the gate electrode 7 is formed via the gate insulating film 8 on the upper surface of the channel resistance adjustment region 6 or the channel resistance adjustment region 6a.
- the interlayer insulating film 9 is formed so as to cover the gate electrode 7.
- the source electrode 10 is formed on the upper surface of the interlayer insulating film 9 and the upper surface of the source region 4. Drain electrode 12 is formed on the lower surface of SiC substrate 1.
- the channel resistance adjustment region 6 is a region where the first impurity region of the first conductivity type is intermittently formed in a direction intersecting the direction in which the source region 4 and the SiC epitaxial layer 2 sandwich the channel resistance adjustment region 6. It is.
- the channel resistance adjustment region 6a is a region in which the second impurity region of the second conductivity type is intermittently formed in a direction intersecting the direction in which the source region 4 and the SiC epitaxial layer 2 sandwich the channel resistance adjustment region 6a. It is.
- the on-resistance can be reduced while suppressing a decrease in the short-circuit withstand capability. That is, in the surface layer of the well region 3, a region (channel resistance adjustment region 6 or channel resistance adjustment region 6 a) having a different carrier concentration is partially formed, so that current is locally concentrated in a region having a low channel resistance. It will be. Then, the portion where the current is concentrated generates heat locally, and the resistance increases, so that the flowing current is suppressed. For this reason, since a saturation current is suppressed as compared with a semiconductor device in which the carrier concentration in the channel portion is uniform and has the same on-resistance, the short-circuit tolerance is improved.
- the impurity concentration of the channel resistance adjustment region 6a is higher than the impurity concentration of the well region 3, the electric field concentration at the corners of each cell is alleviated, so that the short circuit withstand capability can be suppressed.
- channel resistance adjustment region 6 is provided at the corner of each cell, current concentration occurs when the electric field is concentrated at the corner of each cell, and the chip may be destroyed. It is necessary.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Electrodes Of Semiconductors (AREA)
Abstract
Description
<構成>
図1は、本実施形態に関する炭化珪素半導体装置の構造を示す断面図である。図1は、チャネル抵抗調整領域を含むSiC-MOSFETのチップ断面図である。図2は、本実施形態に関する炭化珪素半導体装置の構造を示す上面図である。
以下に、本実施形態による効果を例示する。
上記実施形態では、各構成要素の材質、材料、寸法、形状、相対的配置関係または実施の条件などについても記載している場合があるが、これらはすべての局面において例示であって、本発明が記載されたものに限られることはない。よって、例示されていない無数の変形例が、本発明の範囲内において想定される。例えば、任意の構成要素を変形する場合または省略する場合が含まれる。
Claims (6)
- 炭化珪素半導体基板(1)の上面に形成される、第1導電型のエピタキシャル層(2)と、
前記エピタキシャル層(2)の表層において部分的に形成される、第2導電型のウェル領域(3)と、
前記ウェル領域(3)の表層において部分的に形成される、第1導電型のソース領域(4)と、
前記ウェル領域(3)の表層において、前記ソース領域(4)と前記エピタキシャル層(2)とに挟まれて形成されるチャネル抵抗調整領域(6、6a)と、
前記チャネル抵抗調整領域(6、6a)の上面において、ゲート絶縁膜(8)を介して形成されるゲート電極(7)と、
前記ゲート電極(7)を覆って形成される層間絶縁膜(9)と、
前記層間絶縁膜(9)の上面および前記ソース領域(4)の上面に形成されるソース電極(10)と、
前記炭化珪素半導体基板(1)の下面に形成されるドレイン電極(12)とを備え、
前記チャネル抵抗調整領域(6、6a)は、前記ソース領域(4)と前記エピタキシャル層(2)とが前記チャネル抵抗調整領域(6、6a)を挟む方向と交差する方向において、第1導電型である第1不純物領域(6)、または、第2導電型である第2不純物領域(6a)が、断続的に形成される領域であり、
前記チャネル抵抗調整領域が、前記第1不純物領域(6)が断続的に形成される領域である場合、前記第1不純物領域(6)の不純物濃度は、前記エピタキシャル層(2)の不純物濃度よりも高く、
前記チャネル抵抗調整領域が、前記第2不純物領域(6a)が断続的に形成される領域である場合、前記第2不純物領域(6a)の不純物濃度は、前記ウェル領域(3)の不純物濃度よりも高い、
炭化珪素半導体装置。 - 前記チャネル抵抗調整領域(6、6a)は、前記ウェル領域(3)の表層において前記ソース領域(4)の四方を囲んで形成され、
前記チャネル抵抗調整領域(6、6a)は、前記ソース領域(4)を囲む辺において、前記第1不純物領域(6)、または、前記第2不純物領域(6a)が、断続的に形成される領域である、
請求項1に記載の炭化珪素半導体装置。 - 前記第1不純物領域(6)は、前記ソース領域(4)を囲む角には形成されない、
請求項2に記載の炭化珪素半導体装置。 - 前記第2不純物領域(6a)は、前記ソース領域(4)を囲む角に形成される、
請求項2に記載の炭化珪素半導体装置。 - 前記第2不純物領域(6a)は、Alイオンが注入されることで形成される、
請求項1、3および4のうちのいずれか1項に記載の炭化珪素半導体装置。 - 前記ウェル領域(3)および前記ソース領域(4)が、平面視において、ストライプ形状である、
請求項1に記載の炭化珪素半導体装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016528955A JP6224242B2 (ja) | 2014-06-27 | 2014-06-27 | 炭化珪素半導体装置 |
CN201480080201.5A CN106663693B (zh) | 2014-06-27 | 2014-06-27 | 碳化硅半导体装置 |
PCT/JP2014/067150 WO2015198468A1 (ja) | 2014-06-27 | 2014-06-27 | 炭化珪素半導体装置 |
US15/307,835 US9985124B2 (en) | 2014-06-27 | 2014-06-27 | Silicon carbide semiconductor device |
DE112014006762.8T DE112014006762B4 (de) | 2014-06-27 | 2014-06-27 | Siliciumcarbid-Halbleiteranordnung |
KR1020167036267A KR101870558B1 (ko) | 2014-06-27 | 2014-06-27 | 탄화규소 반도체 장치 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2014/067150 WO2015198468A1 (ja) | 2014-06-27 | 2014-06-27 | 炭化珪素半導体装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015198468A1 true WO2015198468A1 (ja) | 2015-12-30 |
Family
ID=54937592
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/067150 WO2015198468A1 (ja) | 2014-06-27 | 2014-06-27 | 炭化珪素半導体装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US9985124B2 (ja) |
JP (1) | JP6224242B2 (ja) |
KR (1) | KR101870558B1 (ja) |
CN (1) | CN106663693B (ja) |
DE (1) | DE112014006762B4 (ja) |
WO (1) | WO2015198468A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017055027A (ja) * | 2015-09-11 | 2017-03-16 | 株式会社東芝 | 半導体装置 |
CN107046059A (zh) * | 2016-02-05 | 2017-08-15 | 瀚薪科技股份有限公司 | 碳化硅半导体元件以及其制造方法 |
CN107658335A (zh) * | 2016-07-25 | 2018-02-02 | 株式会社日立制作所 | 半导体装置及其制造方法 |
WO2019198167A1 (ja) * | 2018-04-11 | 2019-10-17 | 新電元工業株式会社 | 半導体装置の製造方法及び半導体装置 |
DE112022000976T5 (de) | 2021-05-18 | 2023-11-23 | Fuji Electric Co., Ltd. | Siliziumkarbid-halbleitervorrichtung |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108463885A (zh) * | 2015-12-11 | 2018-08-28 | 罗姆股份有限公司 | 半导体装置 |
JP7018394B2 (ja) * | 2016-08-19 | 2022-02-10 | ローム株式会社 | 半導体装置 |
US10497777B2 (en) * | 2017-09-08 | 2019-12-03 | Hestia Power Inc. | Semiconductor power device |
JP7099369B2 (ja) | 2018-03-20 | 2022-07-12 | 株式会社デンソー | 半導体装置およびその製造方法 |
US10504995B1 (en) | 2018-08-09 | 2019-12-10 | Semiconductor Components Industries, Llc | Short-circuit performance for silicon carbide semiconductor device |
CN111739930B (zh) * | 2020-06-30 | 2021-09-24 | 电子科技大学 | 一种抗电离辐射加固的mos栅控晶闸管 |
JP7476130B2 (ja) * | 2021-03-18 | 2024-04-30 | 株式会社東芝 | 半導体装置、半導体装置の製造方法、インバータ回路、駆動装置、車両、及び、昇降機 |
CN114203825B (zh) * | 2021-12-13 | 2023-03-24 | 无锡新洁能股份有限公司 | 一种垂直型碳化硅功率mosfet器件及其制造方法 |
CN116013905B (zh) * | 2023-03-27 | 2023-06-23 | 通威微电子有限公司 | 一种半导体器件及其制作方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59149057A (ja) * | 1983-02-15 | 1984-08-25 | Nissan Motor Co Ltd | 縦型mosトランジスタ |
JPH1065165A (ja) * | 1996-08-23 | 1998-03-06 | Semiconductor Energy Lab Co Ltd | 絶縁ゲイト型半導体装置およびその作製方法 |
WO2002029900A2 (en) * | 2000-10-03 | 2002-04-11 | Cree, Inc. | Silicon carbide power mosfets having a shorting channel and methods of fabrication them |
WO2011135995A1 (ja) * | 2010-04-26 | 2011-11-03 | 三菱電機株式会社 | 半導体装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0963983A (ja) | 1995-08-29 | 1997-03-07 | Oki Electric Ind Co Ltd | 不純物拡散領域の形成方法、拡散mosトランジスタの製造方法、ダイオードの製造方法 |
JP3027939B2 (ja) | 1996-04-19 | 2000-04-04 | 日本電気株式会社 | 縦型電界効果トランジスタおよびその製造方法 |
US6703671B1 (en) | 1996-08-23 | 2004-03-09 | Semiconductor Energy Laboratory Co., Ltd. | Insulated gate semiconductor device and method of manufacturing the same |
CN101946322B (zh) | 2008-02-12 | 2012-12-19 | 三菱电机株式会社 | 碳化硅半导体装置 |
-
2014
- 2014-06-27 JP JP2016528955A patent/JP6224242B2/ja active Active
- 2014-06-27 US US15/307,835 patent/US9985124B2/en active Active
- 2014-06-27 CN CN201480080201.5A patent/CN106663693B/zh active Active
- 2014-06-27 DE DE112014006762.8T patent/DE112014006762B4/de active Active
- 2014-06-27 KR KR1020167036267A patent/KR101870558B1/ko active IP Right Grant
- 2014-06-27 WO PCT/JP2014/067150 patent/WO2015198468A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59149057A (ja) * | 1983-02-15 | 1984-08-25 | Nissan Motor Co Ltd | 縦型mosトランジスタ |
JPH1065165A (ja) * | 1996-08-23 | 1998-03-06 | Semiconductor Energy Lab Co Ltd | 絶縁ゲイト型半導体装置およびその作製方法 |
WO2002029900A2 (en) * | 2000-10-03 | 2002-04-11 | Cree, Inc. | Silicon carbide power mosfets having a shorting channel and methods of fabrication them |
WO2011135995A1 (ja) * | 2010-04-26 | 2011-11-03 | 三菱電機株式会社 | 半導体装置 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017055027A (ja) * | 2015-09-11 | 2017-03-16 | 株式会社東芝 | 半導体装置 |
CN107046059A (zh) * | 2016-02-05 | 2017-08-15 | 瀚薪科技股份有限公司 | 碳化硅半导体元件以及其制造方法 |
CN107046059B (zh) * | 2016-02-05 | 2020-04-21 | 瀚薪科技股份有限公司 | 碳化硅半导体元件以及其制造方法 |
CN107658335A (zh) * | 2016-07-25 | 2018-02-02 | 株式会社日立制作所 | 半导体装置及其制造方法 |
CN107658335B (zh) * | 2016-07-25 | 2020-09-29 | 株式会社日立制作所 | 半导体装置及其制造方法 |
WO2019198167A1 (ja) * | 2018-04-11 | 2019-10-17 | 新電元工業株式会社 | 半導体装置の製造方法及び半導体装置 |
DE112022000976T5 (de) | 2021-05-18 | 2023-11-23 | Fuji Electric Co., Ltd. | Siliziumkarbid-halbleitervorrichtung |
Also Published As
Publication number | Publication date |
---|---|
KR101870558B1 (ko) | 2018-06-22 |
DE112014006762T5 (de) | 2017-04-20 |
JPWO2015198468A1 (ja) | 2017-04-20 |
CN106663693B (zh) | 2019-11-01 |
CN106663693A (zh) | 2017-05-10 |
DE112014006762B4 (de) | 2021-09-30 |
JP6224242B2 (ja) | 2017-11-01 |
KR20170005136A (ko) | 2017-01-11 |
US9985124B2 (en) | 2018-05-29 |
US20170054017A1 (en) | 2017-02-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6224242B2 (ja) | 炭化珪素半導体装置 | |
JP6415749B2 (ja) | 炭化珪素半導体装置 | |
JP5776610B2 (ja) | 炭化珪素半導体装置およびその製造方法 | |
US8772788B2 (en) | Semiconductor element and method of manufacturing thereof | |
US8933466B2 (en) | Semiconductor element | |
US9029869B2 (en) | Semiconductor device | |
US20110057202A1 (en) | Semiconductor device and method of fabricating the same | |
WO2014118859A1 (ja) | 炭化珪素半導体装置 | |
JP2019197792A5 (ja) | ||
JP2011023675A (ja) | 半導体装置及びその製造方法 | |
JP2014241435A (ja) | 半導体装置 | |
JP2017112161A (ja) | 半導体装置 | |
JP2011204924A (ja) | 半導体装置 | |
JP6463506B2 (ja) | 炭化珪素半導体装置 | |
US11251299B2 (en) | Silicon carbide semiconductor device and manufacturing method of same | |
WO2015056318A1 (ja) | 炭化珪素半導体装置 | |
JP2008300420A (ja) | 半導体装置及び半導体装置の製造方法 | |
JP2014187200A (ja) | 半導体装置の製造方法 | |
JP5148852B2 (ja) | 半導体装置 | |
JP2005191247A (ja) | 半導体基板及びそれを用いた半導体装置 | |
JP2011124325A (ja) | 半導体装置、及びその製造方法 | |
JP6318721B2 (ja) | 半導体装置および半導体装置の製造方法 | |
JP2014504008A (ja) | Cmos素子及びその製造方法 | |
JP6988261B2 (ja) | 窒化物半導体装置 | |
JP5784860B1 (ja) | 炭化ケイ素半導体装置 |
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: 14895555 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2016528955 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15307835 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 20167036267 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 112014006762 Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 14895555 Country of ref document: EP Kind code of ref document: A1 |