WO2015177910A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
- Publication number
- WO2015177910A1 WO2015177910A1 PCT/JP2014/063602 JP2014063602W WO2015177910A1 WO 2015177910 A1 WO2015177910 A1 WO 2015177910A1 JP 2014063602 W JP2014063602 W JP 2014063602W WO 2015177910 A1 WO2015177910 A1 WO 2015177910A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- type
- trench
- layer
- semiconductor substrate
- gate
- Prior art date
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 73
- 239000000758 substrate Substances 0.000 claims abstract description 35
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 238000009792 diffusion process Methods 0.000 claims description 18
- 230000000052 comparative effect Effects 0.000 description 24
- 230000000694 effects Effects 0.000 description 11
- 230000002411 adverse Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- H01L29/70—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
-
- 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
- H01L29/10—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
- H01L29/06—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
- H01L29/0603—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 particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions
- H01L29/0607—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 particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration
- H01L29/0611—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 particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices
- H01L29/0615—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 particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE]
- H01L29/0619—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 particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE] with a supplementary region doped oppositely to or in rectifying contact with the semiconductor containing or contacting region, e.g. guard rings with PN or Schottky junction
-
- 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
Definitions
- the present invention relates to a semiconductor device having an Insulated Gate Bipolar Transistor (IGBT).
- IGBT Insulated Gate Bipolar Transistor
- planar IGBTs are used in planar IGBTs in which the MOS structure is a planar structure, it is necessary to secure an area necessary for device operation, and there is a limit to miniaturization. In addition, the high on voltage is limited.
- the gate structure is a trench (vertical) structure, miniaturization is possible (see, for example, Patent Document 1). Also, the on-voltage characteristics can be improved by utilizing the electron injection effect at the bottom of the trench.
- a cell is the smallest repeating pattern of vertical and longitudinal directions of a trench.
- Active cell density is the number of cells in an area of 1 cm 2 .
- the thinning rate is a ratio of the number of trenches serving as the emitter potential to the number of all trenches in one cell.
- the present invention has been made to solve the problems as described above, and its object is to obtain a semiconductor device capable of suppressing the saturation current without adversely affecting the on voltage.
- a semiconductor device comprises: an N-type semiconductor substrate; a plurality of trenches provided on the upper surface of the N-type semiconductor substrate; a gate trench provided in the trenches via an insulating film; A planar MOSFET provided on the upper surface of the N-type semiconductor substrate in the mesa portion, a P-type emitter layer provided between the trench and the planar MOSFET in the mesa portion, and a lower surface of the N-type semiconductor substrate
- the planar MOSFET includes an N-type emitter layer, an N-type diffusion layer connected to the N-type semiconductor substrate, the N-type emitter layer, and the N-type diffusion layer.
- planar gate provided on the N-type diffusion layer and the P-type base layer with a gate insulating film interposed therebetween. And The planar gate is connected to the gate trench, the P-type emitter layer has a higher impurity concentration than the P-type base layer, has the same emitter potential as the N-type emitter layer, and the N-type emitter layer It is characterized in that it is not in contact with the trench, and a trench type MOSFET is not configured.
- a P-type emitter layer having a high impurity concentration is provided between the trench and the planar MOSFET, and the N-type emitter layer is not in contact with the trench.
- the saturation current can be suppressed without adversely affecting the on voltage by increasing the channel length of the planar MOSFET and decreasing the active cell density without increasing the length of the P-type emitter layer.
- FIG. 1 is a cross-sectional perspective view showing a semiconductor device according to Embodiment 1 of the present invention. It is the cross-sectional perspective view which abbreviate
- FIG. 4 is a cross-sectional view taken along line I-II of FIG. 3;
- FIG. 1 is a plan view showing a planar MOSFET according to Embodiment 1 of the present invention.
- FIG. 6 is a cross-sectional view showing a planar IGBT according to Comparative Example 1;
- FIG. 10 is a cross-sectional perspective view showing a trench IGBT according to Comparative Example 2;
- FIG. 13 is a plan view for explaining the flow of electron current in Comparative Example 2;
- FIG. 5 is a plan view for illustrating the flow of electron current of the semiconductor device according to the first embodiment of the present invention. It is a figure which shows the channel width dependence of saturation current density Jc (sat). It is a figure which shows the channel length dependence of saturation current density Jc (sat). It is a top view which shows the modification of the planar type
- FIG. 6 is a cross-sectional perspective view showing a modified example of the semiconductor device according to the first embodiment of the present invention.
- FIG. 6 is a cross-sectional perspective view showing a modified example of the semiconductor device according to the first embodiment of the present invention.
- FIG. 6 is a cross-sectional perspective view showing a semiconductor device in accordance with a second embodiment of the present invention.
- FIG. 15 is a cross-sectional view taken along line I-II of FIG. It is sectional drawing which shows the semiconductor device concerning Embodiment 3 of this invention.
- FIG. 7 is a diagram showing on voltages of semiconductor devices according to Comparative Example 1 and Embodiments 1 to 3; It is a cross-sectional perspective view which shows the semiconductor device concerning Embodiment 4 of this invention.
- FIG. 19 is a cross-sectional perspective view of the device of FIG. 18 with the flat gate omitted.
- FIG. 19 is a cross-sectional perspective view in which the planar gate and the gate insulating film are omitted in the device of FIG. 18; FIG.
- FIG. 21 is a cross-sectional view taken along line I-II of FIG. 20. It is a figure which shows the JC-VC output-characteristics waveform of the apparatus of the comparative example 1, the comparative example 2, and the embodiments 1 and 4 which have the same channel length. It is a figure which shows the JC short circuit interruption
- FIG. 1 is a cross-sectional perspective view showing a semiconductor device according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional perspective view of the device of FIG. 1 with the flat gate omitted.
- FIG. 3 is a cross-sectional perspective view in which the planar gate and the gate insulating film are omitted in the device of FIG.
- FIG. 4 is a cross-sectional view taken along line I-II of FIG.
- the high breakdown voltage class of 6500 V is shown as an example as an embodiment, the present invention can be applied regardless of the breakdown voltage class.
- a plurality of trenches 2 are provided on the upper surface of the N ⁇ -type semiconductor substrate 1.
- a gate trench 4 is provided in the trench 2 via the insulating film 3.
- a planar MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) 5 is provided on the upper surface of the N ⁇ -type semiconductor substrate 1 in the mesa portion between the trenches 2.
- a P + -type emitter layer 6 is provided between the trench 2 and the planar MOSFET 5.
- An N-type buffer layer 7 and a P-type collector layer 8 are provided in order on the lower surface of the N ⁇ -type semiconductor substrate 1.
- a collector electrode 9 is connected to the P-type collector layer 8.
- Flat MOSFET5 includes a N + -type emitter layer 10, N - type and an upper portion of the semiconductor substrate 1, the N + type emitter layer 10 and the N - P type provided between the upper -type semiconductor substrate 1 base layer 12 And a planar gate 14 provided on these via the gate insulating film 13.
- the N + -type emitter layer 10 is a source
- the upper portion of the N ⁇ -type semiconductor substrate 1 is a drain
- the P-type base layer 12 is a channel
- the planar MOSFET 5 operates as an n-channel MOSFET.
- the gate trench 4 and the planar gate 14 are polysilicon
- the insulating film 3 and the gate insulating film 13 are oxide films.
- the planar gate 14 is connected to the gate trench 4.
- a P + -type emitter layer 6 is provided between the trench 2 and the N + -type emitter layer 10.
- the P + -type emitter layer 6 has a higher impurity concentration than the P-type base layer 12 and has the same emitter potential as the N + -type emitter layer 10.
- the N + -type emitter layer 10 is not in contact with the trench 2 and a trench-type MOSFET is not configured.
- FIG. 5 is a plan view showing a planar MOSFET according to the first embodiment of the present invention. However, the gate insulating film 13 and the planar gate 14 are omitted. The upper portions of the N + -type emitter layer 10, the P-type base layer 12 and the N -- type semiconductor substrate 1 are sequentially arranged in the longitudinal direction of the trench 2 in plan view perpendicular to the upper surface of the N -- type semiconductor substrate 1 There is.
- the width of the P-type base layer 12 along the short direction of the trench 2 in plan view is the channel width W.
- the length of the P-type base layer 12 along the longitudinal direction of the trench 2 in a plan view is the channel length L.
- FIG. 6 is a cross-sectional view showing a planar IGBT according to Comparative Example 1.
- FIG. 7 is a cross-sectional perspective view showing a trench IGBT according to Comparative Example 2.
- a plurality of dummy trenches 15 are provided on the upper surface of the N ⁇ -type semiconductor substrate 1.
- a dummy gate trench 17 is provided in the dummy trench 15 via the insulating film 16.
- Dummy gate trench 17 has the same emitter potential as N + -type emitter layer 10.
- an N type diffusion region 18 is provided between the N ⁇ type semiconductor substrate 1 and the P type base layer 12.
- FIG. 8 is a plan view for explaining the flow of the electron current of Comparative Example 2.
- FIG. 9 is a plan view for illustrating the flow of the electron current of the semiconductor device according to the first embodiment of the present invention. The path of the electron current is indicated by an arrow.
- the length of the P + -type emitter layer 6 is increased to reduce the active cell density, and the resistance component is increased to suppress the saturation current density Jc (sat).
- a resistance component is generated in the path along which the electron current flows along the side of the trench 2, which adversely affects the on voltage.
- the P + -type emitter layer 6 having a high impurity concentration is provided between the trench 2 and the planar MOSFET 5, and the N + -type emitter layer 10 is not in contact with the trench 2.
- an electron current flows immediately below the channel of the planar MOSFET 5 and the P + -type emitter layer 6.
- the on voltage is not adversely affected.
- the saturation current is suppressed without adversely affecting the on voltage.
- FIG. 10 is a diagram showing the channel width dependency of the saturation current density Jc (sat).
- the channel length is 4 ⁇ m in FIG. 10 and the channel width is 2 ⁇ m in FIG. Jc (sat) is a characteristic indicating the current driving force of a unit area of the device when the gate voltage is constant. From FIGS. 10 and 11, it can be seen that if the channel width is narrower than 0.3 ⁇ m, Jc (sat) decreases sharply, and if the channel spacing is shorter than 3.0 ⁇ m, Jc (sat) decreases sharply. Accordingly, the channel width W is preferably 0.3 ⁇ m or more, and the channel length L is preferably 3.0 ⁇ m or more.
- FIG. 12 is a plan view showing a variation of the planar MOSFET according to the first embodiment of the present invention.
- the planar gate 14 of the planar MOSFET 5 is separated. Even in this case, the same effect as that of the above embodiment can be obtained.
- FIG. 13 is a cross-sectional perspective view showing a variation of the semiconductor device according to the first embodiment of the present invention. There is no N-type buffer layer 7 on the lower surface of the N ⁇ -type semiconductor substrate 1. Even in this case, the same effect as that of the above embodiment can be obtained.
- the trench 2 shown in the above embodiment has a round bottom shape.
- the same effect as that of the above embodiment can be obtained by using the trench 2 having other shapes such as a square bottom and a bulging bottom, for example.
- FIG. 14 is a cross-sectional perspective view showing the semiconductor device according to the second embodiment of the present invention.
- FIG. 15 is a cross-sectional view taken along line I-II of FIG.
- An N-type diffusion layer 19 to be a drain of the planar MOSFET 5 is provided on the entire surface of the cell region.
- N-type diffusion layer 19, N - -type is connected to the semiconductor substrate 1, N - -type having a semiconductor impurity concentration higher than the substrate 1, it is shallower than the trench 2 depth. Since the N type diffusion layer 19 becomes a barrier layer of holes and the carrier concentration on the emitter side of the device is improved, the on voltage can be reduced.
- Other configurations and effects are the same as in the first embodiment.
- FIG. 16 is a cross-sectional view showing a semiconductor device according to the third embodiment of the present invention.
- An N-type diffusion layer 19 is partially provided below the planar gate 14.
- the other configuration is the same as that of the second embodiment. Even in this case, the same effect as that of the second embodiment can be obtained.
- FIG. 17 is a diagram showing on voltages of the semiconductor devices according to Comparative Example 1 and Embodiments 1 to 3.
- FIG. 18 is a cross-sectional perspective view showing the semiconductor device according to the fourth embodiment of the present invention.
- FIG. 19 is a cross-sectional perspective view of the device of FIG. 18 with the flat gate omitted.
- FIG. 20 is a sectional perspective view in which the planar gate and the gate insulating film are omitted in the device of FIG.
- FIG. 21 is a cross-sectional view taken along line I-II of FIG.
- a plurality of dummy trenches 15 are provided on the upper surface of the N ⁇ -type semiconductor substrate 1.
- a dummy gate trench 17 is provided in the dummy trench 15 via the insulating film 16.
- Dummy gate trench 17 has the same emitter potential as N + -type emitter layer 10.
- the dummy gate trench 17 is polysilicon and the insulating film 16 is an oxide film.
- planar MOSFET 5 is provided on the upper surface of the N ⁇ -type semiconductor substrate 1 in the mesa portion between the trenches 2, it is not provided between the dummy trenches.
- the thinning rate can be increased along the widthwise direction of the trench 2 in plan view, the active cell density can be reduced, and Jc (sat) can be suppressed.
- Other configurations and effects are the same as in the first embodiment.
- the thinning rate of the fourth embodiment is the same as the thinning rate of the comparative example 2. It is understood that in the first and fourth embodiments, the saturation current Jc can be suppressed without adversely affecting the on voltage Vc.
- FIG. 23 is a diagram showing the Jc short-circuit breaking ability of the devices of Comparative Example 1, Comparative Example 2, and Embodiments 1 and 4 having the same channel length.
- the index indicating the short circuit interruption ability is the maximum pulse width TW which can be interrupted without destruction of the device.
- TW of Comparative Example 1 is 1
- Jc (sat) of Comparative Example 1 is 1.
- the higher Jc (sat) generates heat in the device during the short and the shorter the time to withstand the short (TW).
- the fourth embodiment suppresses Jc (sat), so it can be seen that it has a higher short circuit breaking capability.
- FIG. 24 is a cross-sectional perspective view showing a variation of the semiconductor device according to the fourth embodiment of the present invention. Two mesa portions sandwich one gate trench 4. Even in this case, the same effect as that of the above embodiment can be obtained.
- FIG. 25 is a cross-sectional perspective view showing the semiconductor device according to the fifth embodiment of the present invention.
- the cross-sectional view along I-II in FIG. 25 is the same as FIG.
- An N-type diffusion layer 19 to be a drain of the planar MOSFET 5 is provided on the entire surface of the cell region.
- the N type diffusion layer 19 has a higher impurity concentration than the N ⁇ type semiconductor substrate 1, and the depth is shallower than the trench 2. Since the N type diffusion layer 19 becomes a barrier layer of holes and the carrier concentration on the emitter side of the device is improved, the on voltage can be reduced.
- the other configuration and effects are the same as in the fourth embodiment.
- the N-type diffusion layer 19 may be partially provided below the planar gate 14 as in the third embodiment. Even in this case, the same effect as that of the fifth embodiment can be obtained.
- the semiconductor device is not limited to one formed of silicon, and may be formed of a wide band gap semiconductor having a larger band gap than silicon.
- the wide band gap semiconductor is, for example, silicon carbide, gallium nitride based material, or diamond.
- a semiconductor device formed of such a wide band gap semiconductor can be miniaturized because of high voltage resistance and allowable current density. By using this miniaturized device, it is possible to miniaturize a semiconductor module incorporating this device. Further, since the heat resistance of the device is high, the heat radiation fins of the heat sink can be miniaturized, and the water cooling portion can be air cooled, so that the semiconductor module can be further miniaturized. In addition, since the power loss of the device is low and the efficiency is high, the semiconductor module can be highly efficient.
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)
- Electrodes Of Semiconductors (AREA)
Abstract
Description
アクティブセル密度=1/(トレンチの垂直方向の最小繰り返し寸法*トレンチの長手方向の最小繰り返し寸法)
間引き率=セル内のエミッタ電位となるトレンチの数/セル内の全てのトレンチの数
図1は、本発明の実施の形態1に係る半導体装置を示す断面斜視図である。図2は図1の装置において平面ゲートを省略した断面斜視図である。図3は図1の装置において平面ゲートとゲート絶縁膜を省略した断面斜視図である。図4は図3のI-IIに沿った断面図である。なお、実施の形態として6500Vの高耐圧クラスを例に示すが、耐圧クラスに関わらず本発明を適用することができる。
図14は、本発明の実施の形態2に係る半導体装置を示す断面斜視図である。図15は図14のI-IIに沿った断面図である。平面型MOSFET5のドレインとなるN型拡散層19がセル領域全面に設けられている。N型拡散層19は、N-型半導体基板1に接続され、N-型半導体基板1より高い不純物濃度を持ち、深さがトレンチ2よりも浅い。N型拡散層19がホールのバリア層になり装置のエミッタ側のキャリア濃度が向上するため、オン電圧を低減することができる。その他の構成及び効果は実施の形態1と同様である。
図16は、本発明の実施の形態3に係る半導体装置を示す断面図である。N型拡散層19が平面ゲート14の下方に部分的に設けられている。その他の構成は実施の形態2と同様である。この場合でも実施の形態2と同様の効果を得ることができる。
図18は、本発明の実施の形態4に係る半導体装置を示す断面斜視図である。図19は図18の装置において平面ゲートを省略した断面斜視図である。図20は図18の装置において平面ゲートとゲート絶縁膜を省略した断面斜視図である。図21は図20のI-IIに沿った断面図である。
図25は、本発明の実施の形態5に係る半導体装置を示す断面斜視図である。図25のI-IIに沿った断面図は図15と同じである。平面型MOSFET5のドレインとなるN型拡散層19がセル領域全面に設けられている。N型拡散層19は、N-型半導体基板1より高い不純物濃度を持ち、深さがトレンチ2よりも浅い。N型拡散層19がホールのバリア層になり装置のエミッタ側のキャリア濃度が向上するため、オン電圧を低減することができる。その他の構成及び効果は実施の形態4と同様である。また、実施の形態5において実施の形態3と同様にN型拡散層19を平面ゲート14の下方に部分的に設けてもよい。この場合でも実施の形態5と同様の効果を得ることができる。
Claims (6)
- N型半導体基板と、
前記N型半導体基板の上面に設けられた複数のトレンチと、
前記トレンチ内に絶縁膜を介して設けられたゲートトレンチと、
前記トレンチ間のメサ部において前記N型半導体基板の上面に設けられた平面型MOSFETと、
前記メサ部において前記トレンチと前記平面型MOSFETとの間に設けられたP型エミッタ層と、
前記N型半導体基板の下面に設けられたP型コレクタ層とを備え、
前記平面型MOSFETは、N型エミッタ層と、前記N型半導体基板に接続されたN型拡散層と、前記N型エミッタ層と前記N型拡散層との間に設けられたP型ベース層と、前記N型エミッタ層の一部と前記N型拡散層と前記P型ベース層の上にゲート絶縁膜を介して設けられた平面ゲートとを有し、
前記平面ゲートは前記ゲートトレンチに接続され、
前記P型エミッタ層は、前記P型ベース層より高い不純物濃度を持ち、前記N型エミッタ層と同じエミッタ電位を有し、
前記N型エミッタ層は前記トレンチに接しておらず、トレンチ型MOSFETが構成されていないことを特徴とする半導体装置。 - 前記N型エミッタ層と前記P型ベース層と前記N型拡散層は、前記N型半導体基板の前記上面に対して垂直な平面視において前記トレンチの長手方向に沿って順に並んでいることを特徴とする請求項1に記載の半導体装置。
- 前記平面視において前記トレンチの短手方向に沿った前記P型ベース層の幅は0.3μm以上であることを特徴とする請求項2に記載の半導体装置。
- 前記平面視において前記トレンチの長手方向に沿った前記P型ベース層の長さは3.0μm以上であることを特徴とする請求項2又は3に記載の半導体装置。
- 前記N型拡散層は、前記N型半導体基板より高い不純物濃度を持ち、深さが前記トレンチよりも浅いことを特徴とする請求項1~4の何れか1項に記載の半導体装置。
- 前記N型半導体基板の上面に設けられた複数のダミートレンチと、
前記ダミートレンチ内に絶縁膜を介して設けられ前記N型エミッタ層と同じエミッタ電位を有するダミーゲートトレンチとを備えることを特徴とする請求項1~5の何れか1項に記載の半導体装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016520879A JP6183550B2 (ja) | 2014-05-22 | 2014-05-22 | 半導体装置 |
DE112014006692.3T DE112014006692B4 (de) | 2014-05-22 | 2014-05-22 | Halbleiteranordnung |
PCT/JP2014/063602 WO2015177910A1 (ja) | 2014-05-22 | 2014-05-22 | 半導体装置 |
CN201480079213.6A CN106463527B (zh) | 2014-05-22 | 2014-05-22 | 半导体装置 |
US15/120,874 US9640644B1 (en) | 2014-05-22 | 2014-05-22 | Semiconductor device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2014/063602 WO2015177910A1 (ja) | 2014-05-22 | 2014-05-22 | 半導体装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015177910A1 true WO2015177910A1 (ja) | 2015-11-26 |
Family
ID=54553603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/063602 WO2015177910A1 (ja) | 2014-05-22 | 2014-05-22 | 半導体装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US9640644B1 (ja) |
JP (1) | JP6183550B2 (ja) |
CN (1) | CN106463527B (ja) |
DE (1) | DE112014006692B4 (ja) |
WO (1) | WO2015177910A1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106206679B (zh) * | 2016-08-31 | 2019-08-23 | 电子科技大学 | 一种逆导型igbt |
CN108682688B (zh) * | 2018-02-13 | 2020-11-10 | 株洲中车时代半导体有限公司 | 一种具有三维沟道的复合栅igbt芯片 |
GB2585696B (en) * | 2019-07-12 | 2021-12-15 | Mqsemi Ag | Semiconductor device and method for producing same |
GB2586158B (en) | 2019-08-08 | 2022-04-13 | Mqsemi Ag | Semiconductor device and method for producing same |
JP7330092B2 (ja) * | 2019-12-25 | 2023-08-21 | 三菱電機株式会社 | 半導体装置 |
GB2590716B (en) | 2019-12-30 | 2023-12-20 | Mqsemi Ag | Fortified trench planar MOS power transistor |
US11404460B2 (en) * | 2020-01-07 | 2022-08-02 | Taiwan Semiconductor Manufacturing Company, Ltd. | Vertical gate field effect transistor |
US11342422B2 (en) * | 2020-07-30 | 2022-05-24 | Taiwan Semiconductor Manufacturing Company Ltd. | Method of manufacturing semiconductor device and associated memory device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05347414A (ja) * | 1992-06-12 | 1993-12-27 | Mitsubishi Electric Corp | 半導体装置及びその製造方法 |
US6303410B1 (en) * | 1998-06-01 | 2001-10-16 | North Carolina State University | Methods of forming power semiconductor devices having T-shaped gate electrodes |
JP2003224278A (ja) * | 2002-01-31 | 2003-08-08 | Mitsubishi Electric Corp | 絶縁ゲート型半導体装置とその製造方法 |
JP2007088010A (ja) * | 2005-09-20 | 2007-04-05 | Denso Corp | 半導体装置およびその製造方法 |
JP2008141056A (ja) * | 2006-12-04 | 2008-06-19 | Toyota Central R&D Labs Inc | 半導体装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3924975B2 (ja) | 1999-02-05 | 2007-06-06 | 富士電機デバイステクノロジー株式会社 | トレンチ型絶縁ゲートバイポーラトランジスタ |
JP3927111B2 (ja) * | 2002-10-31 | 2007-06-06 | 株式会社東芝 | 電力用半導体装置 |
JP4857566B2 (ja) * | 2005-01-27 | 2012-01-18 | 富士電機株式会社 | 絶縁ゲート型半導体装置とその製造方法 |
JP5145665B2 (ja) | 2006-07-26 | 2013-02-20 | 富士電機株式会社 | 絶縁ゲート型バイポーラトランジスタ |
US8441046B2 (en) * | 2010-10-31 | 2013-05-14 | Alpha And Omega Semiconductor Incorporated | Topside structures for an insulated gate bipolar transistor (IGBT) device to achieve improved device performances |
CN102184949B (zh) | 2011-05-09 | 2012-09-12 | 电子科技大学 | 一种深槽侧氧调制的平面型绝缘栅双极型晶体管 |
JP6017127B2 (ja) * | 2011-09-30 | 2016-10-26 | 株式会社東芝 | 炭化珪素半導体装置 |
-
2014
- 2014-05-22 WO PCT/JP2014/063602 patent/WO2015177910A1/ja active Application Filing
- 2014-05-22 US US15/120,874 patent/US9640644B1/en active Active
- 2014-05-22 JP JP2016520879A patent/JP6183550B2/ja active Active
- 2014-05-22 DE DE112014006692.3T patent/DE112014006692B4/de active Active
- 2014-05-22 CN CN201480079213.6A patent/CN106463527B/zh active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05347414A (ja) * | 1992-06-12 | 1993-12-27 | Mitsubishi Electric Corp | 半導体装置及びその製造方法 |
US6303410B1 (en) * | 1998-06-01 | 2001-10-16 | North Carolina State University | Methods of forming power semiconductor devices having T-shaped gate electrodes |
JP2003224278A (ja) * | 2002-01-31 | 2003-08-08 | Mitsubishi Electric Corp | 絶縁ゲート型半導体装置とその製造方法 |
JP2007088010A (ja) * | 2005-09-20 | 2007-04-05 | Denso Corp | 半導体装置およびその製造方法 |
JP2008141056A (ja) * | 2006-12-04 | 2008-06-19 | Toyota Central R&D Labs Inc | 半導体装置 |
Also Published As
Publication number | Publication date |
---|---|
US20170110562A1 (en) | 2017-04-20 |
JPWO2015177910A1 (ja) | 2017-04-20 |
CN106463527B (zh) | 2020-01-14 |
CN106463527A (zh) | 2017-02-22 |
JP6183550B2 (ja) | 2017-08-23 |
US9640644B1 (en) | 2017-05-02 |
DE112014006692B4 (de) | 2023-09-14 |
DE112014006692T5 (de) | 2017-02-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP7105752B2 (ja) | 絶縁ゲート型炭化珪素半導体装置 | |
US20220149167A1 (en) | Semiconductor device and power converter | |
WO2015177910A1 (ja) | 半導体装置 | |
JP4967236B2 (ja) | 半導体素子 | |
US10276666B2 (en) | Semiconductor device | |
JP6508099B2 (ja) | 半導体素子 | |
US20170294526A1 (en) | Reverse-conducting semiconductor device | |
US20160268181A1 (en) | Semiconductor device | |
JPWO2017208734A1 (ja) | 半導体装置 | |
JPH11345969A (ja) | 電力用半導体装置 | |
JP2002280555A (ja) | 半導体装置 | |
JP2009033036A (ja) | 半導体装置及びこれを用いた電気回路装置 | |
JP6356803B2 (ja) | 絶縁ゲートバイポーラトランジスタ | |
JP2005183563A (ja) | 半導体装置 | |
JP6626021B2 (ja) | 窒化物半導体装置 | |
CN112201690B (zh) | Mosfet晶体管 | |
JP2005011846A (ja) | 半導体装置 | |
JP5652409B2 (ja) | 半導体素子 | |
US20160343848A1 (en) | Transistor Arrangement Including Power Transistors and Voltage Limiting Means | |
US20220344455A1 (en) | Semiconductor device | |
JP5261893B2 (ja) | トレンチ型絶縁ゲートバイポーラトランジスタ | |
US20230072827A1 (en) | Trench gate silicon carbide mosfet with high reliability | |
JPWO2015107614A1 (ja) | 電力用半導体装置 | |
JP6651801B2 (ja) | 半導体装置および半導体装置の製造方法 | |
WO2019049251A1 (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: 14892609 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2016520879 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15120874 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 112014006692 Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 14892609 Country of ref document: EP Kind code of ref document: A1 |