WO2011074124A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2011074124A1 WO2011074124A1 PCT/JP2009/071186 JP2009071186W WO2011074124A1 WO 2011074124 A1 WO2011074124 A1 WO 2011074124A1 JP 2009071186 W JP2009071186 W JP 2009071186W WO 2011074124 A1 WO2011074124 A1 WO 2011074124A1
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- 239000004065 semiconductor Substances 0.000 title claims description 228
- 239000010410 layer Substances 0.000 description 67
- 238000010586 diagram Methods 0.000 description 24
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
- H01L27/10—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration
- H01L27/102—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration including bipolar components
- H01L27/1022—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration including bipolar components including bipolar transistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—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 semiconductor device having a trench gate structure.
- IGBT Insulated Gate Bipolar Transistor
- the planar gate IGBT includes a gate electrode on the surface of a semiconductor substrate.
- the breakdown voltage class of 1700 V or less the use of IGBT having a trench gate structure has become the mainstream.
- a gate electrode is embedded in a groove (trench) formed on the surface of a semiconductor substrate via an oxide film.
- the trench gate structure can be a finer cell structure than the planar gate structure. Further, the trench gate structure does not have a JFET region (a portion where current is concentrated in a region sandwiched between adjacent p base regions) peculiar to the planar gate structure. Therefore, the on-voltage can be made lower in the trench gate structure than in the planar gate structure.
- IE injection enhancement
- the surface structure having the IE effect includes, for example, an IEGT (Injection Enhanced Gate Transistor) structure in which a part of the inversion layer channel is inactivated and holes are accumulated in the drift region near the channel portion (for example, Patent Document 1). reference.).
- IEGT injection Enhanced Gate Transistor
- IGBT having a microcell structure in which a p base layer is partially formed in a silicon mesa portion sandwiched between trench sidewalls (see, for example, Patent Document 2).
- FIG. 20 is a plan layout diagram of the microcell structure IGBT described in Patent Document 2.
- the gate insulating film, the interlayer insulating film, the emitter electrode, and the passivation film are omitted.
- FIG. 21 is a cross-sectional view taken along a cutting line A-A ′ in FIG. A cut line A-A 'crosses the trench and the emitter cell.
- it means that electrons or holes are majority carriers in layers and regions with n or p, respectively.
- + and ⁇ attached to n and p mean that the impurity concentration is higher and lower than that of the layer or region not attached thereto.
- the trench 1 is formed in a stripe shape.
- the gate electrode 2 is embedded in the trench 1 via the gate insulating film 3.
- the emitter cells 7 having the p base region 4, the n + emitter region 5 and the p + region 6 are arranged at predetermined intervals W in the mesa portion between the adjacent trenches 1.
- the emitter cells 7 are alternately arranged with a predetermined distance L between mesa portions on both sides of the same trench 1.
- an emitter electrode 10 is electrically connected to the n + emitter region 5 and the p + region 6 through a contact region 9 penetrating the interlayer insulating film 8.
- the emitter electrode 10 and the gate electrode 2 are insulated by the interlayer insulating film 8.
- a passivation film 11 is provided on the emitter electrode 10.
- an n buffer layer 13, a p collector layer 14 and a collector electrode 15 are provided on the main surface of the n ⁇ layer 12 opposite to the main surface on the emitter cell 7 side.
- a region surrounded by a two-dot chain line indicates the active unit cell 16.
- the dimension of the active unit cell 16 in the longitudinal direction of the trench 1 is W / 2.
- a so-called carrier storage trench bipolar transistor CSTBT Carrier Stored Trench-gate Bipolar Transistor
- the CSTBT includes an n layer having a higher impurity concentration than the drift region in the vicinity of the channel.
- holes are accumulated in the drift region (see, for example, Patent Document 3).
- a structure in which a part of the trench gate is short-circuited to the emitter is known in order to suppress an electric field in the vicinity of the n layer near the channel.
- a wide pitch structure is known in which a part of the trench pitch is lengthened to reduce the saturation current (see, for example, Patent Document 4).
- the channel density of the trench IGBT is lower than the channel density that can be provided on the side surface of the trench in principle or design.
- the manufacturing process of the trench gate structure is more complicated than the manufacturing process of the planar gate structure. Therefore, when the chip cost is compared between the trench gate IGBT and the planar gate IGBT, the trench gate IGBT becomes higher. Therefore, in order to provide a switching device with higher added value and lower cost, it is necessary to study a device structure that can be manufactured more simply while maintaining the performance of the IGBT.
- an IGBT structure including a planar gate and a trench gate is known (see, for example, Patent Document 5).
- FIG. 22 is a cross-sectional view of the IGBT described in Patent Document 5.
- n + emitter region 5 is formed apart from trench 1 in p base region 4.
- a structure similar to the device structure shown in FIG. 22 is also disclosed in another patent application (see, for example, Patent Document 6 and Patent Document 7).
- Equation (1) W Trench is the width of the trench, and D Trench is the depth of the trench.
- L is the distance between the emitter cells arranged on both sides of the same trench.
- ⁇ 0 is the dielectric constant of vacuum, and ⁇ r is the relative dielectric constant of the gate insulating film.
- t ox is the thickness of the gate insulating film.
- the gate trench structure continuing from the region with the emitter cell is formed also in the region without the emitter cell between the emitter cells, the gate insulating film in the trench is long. Therefore, the mirror capacity is large.
- the mirror capacitance increases, there is a problem that the drive loss of the element increases.
- the turn-on and turn-off periods of the element become long. Therefore, there is a problem that the switching loss of the element itself increases.
- the gate voltage is raised due to the influence of the bus (collector) voltage surge when the IGBT is off, the IGBT may malfunction and shift to the on state.
- the present invention has been made in view of the above, and an object thereof is to provide a semiconductor device having a trench gate structure with a small mirror capacity.
- a semiconductor device is provided apart from each other on a first conductive type semiconductor layer and a first main surface of the first conductive type semiconductor layer.
- a trench deeper than the conductive semiconductor region is formed, a first insulating film provided in the trench, a first electrode embedded in the trench through the first insulating film, and the second conductive type
- a second insulating film provided on a surface of a semiconductor region sandwiched between the first conductivity type semiconductor regions and an electrical connection between the first electrodes provided on the second insulating film And a second electrode that is provided on the surface of the first conductive semiconductor layer.
- the semiconductor device according to a second aspect of the present invention is the semiconductor device according to the first aspect, wherein the second electrode and the conductive region also serve as a wiring for transmitting a gate signal.
- a semiconductor device is the semiconductor device according to the first aspect, wherein a plurality of trench groups each including a plurality of the trenches are arranged apart from each other, and in each of the trench groups, A plurality of the trenches are arranged side by side in a direction crossing the longitudinal direction of the trenches, and the cells are alternately arranged in adjacent trench groups.
- the semiconductor device according to a fourth aspect of the present invention is the semiconductor device according to the third aspect, wherein the second electrode and the conductive region also serve as a wiring for transmitting a gate signal.
- a semiconductor device is the semiconductor device according to the fourth aspect, wherein the third electrode electrically connected to the contact region and the second main surface of the first conductivity type semiconductor layer are provided. And a fourth electrode electrically connected to the second conductivity type semiconductor layer.
- the semiconductor device according to claim 6 is the semiconductor device according to claim 1, wherein the trenches arranged on both sides of the cell are connected to each other, and the cell is arranged on both sides of the cell. It is provided in a region closed by the trench.
- the semiconductor device according to a seventh aspect of the present invention is the semiconductor device according to the sixth aspect, wherein the second electrode and the conductive region also serve as a wiring for transmitting a gate signal.
- the semiconductor device is the semiconductor device according to the sixth aspect, wherein the cells are also arranged in a part of a region between adjacent regions closed by the trench.
- the second conductivity type semiconductor region provided in the cell between the regions closed by the trench extends longer in the longitudinal direction of the trench than the trench surrounding the region closed by the trench;
- the surface of the region sandwiched between the first conductivity type semiconductor regions provided in the second conductivity type semiconductor region of the second conductivity type semiconductor region provided in the cell between the regions closed by the trench Further, the second electrode for electrically connecting the first electrodes to each other via the second insulating film is provided.
- the semiconductor device according to claim 9 is the semiconductor device according to claim 8, wherein the second electrode and the conductive region also serve as a wiring for transmitting a gate signal.
- a semiconductor device is the semiconductor device according to the eighth aspect, wherein a plurality of trench groups each including a plurality of the trenches are arranged apart from each other.
- the plurality of trenches are arranged side by side in a direction crossing the longitudinal direction of the trenches, and the cells between the regions closed by the trenches are alternately arranged in adjacent trench groups. It is characterized by that.
- the semiconductor device according to an eleventh aspect of the present invention is the semiconductor device according to the tenth aspect, wherein the second electrode and the conductive region also serve as a wiring for transmitting a gate signal.
- a semiconductor device is the semiconductor device according to the eleventh aspect, wherein the third electrode electrically connected to the contact region and the second main surface of the first conductivity type semiconductor layer are provided. And a fourth electrode electrically connected to the second conductivity type semiconductor layer.
- the trench gate structure is provided only in a region having cells, and is not provided in a region without cells between cells. Therefore, the gate insulating film in the gate trench structure is shorter than the conventional one. In addition, even if there is no trench gate structure in the cell-free region between the cells, the gate signal can be transmitted to the gate electrodes of the cells scattered in the island shape by the second electrode and the conductive region. it can.
- the semiconductor device according to the present invention is a semiconductor device having a trench gate structure and has an effect that the mirror capacitance is small.
- FIG. 1 is a plan layout diagram illustrating Example 1 of the semiconductor device according to the embodiment.
- FIG. 2 is a cross-sectional view illustrating Example 1 of the semiconductor device according to the embodiment.
- FIG. 3 is a sectional view showing Example 1 of the semiconductor device according to the embodiment.
- FIG. 4 is a cross-sectional view illustrating Example 1 of the semiconductor device according to the embodiment.
- FIG. 5 is a chip layout diagram showing Example 1 of the semiconductor device according to the embodiment.
- FIG. 6 is a characteristic diagram showing a simulation result of the I ce -V ce characteristic of Example 1.
- FIG. 7 is a characteristic diagram showing a simulation result of the I ce -V ce characteristic of Example 1.
- FIG. 8 is a circuit diagram showing an evaluation circuit of a semiconductor device.
- FIG. 9 is a characteristic diagram showing a simulation result of the turn-on process of the first embodiment.
- FIG. 10 is a plan layout diagram illustrating Example 2 of the semiconductor device according to the embodiment.
- FIG. 11 is a cross-sectional view illustrating a second example of the semiconductor device according to the embodiment.
- FIG. 12 is a cross-sectional view illustrating Example 2 of the semiconductor device according to the embodiment.
- FIG. 13 is a cross-sectional view illustrating a second example of the semiconductor device according to the embodiment.
- FIG. 14 is a chip layout diagram showing Example 2 of the semiconductor device according to the embodiment.
- FIG. 15 is a characteristic diagram showing a simulation result of the I ce -V ce characteristic of Example 2.
- FIG. 16 is a characteristic diagram showing simulation results of the J ce -V ce characteristics of Examples 2 and 3.
- FIG. 17 is a characteristic diagram showing a simulation result of the turn-on process of the second embodiment.
- FIG. 18 is a plan layout diagram illustrating Example 3 of the semiconductor device according to the embodiment.
- FIG. 19 is a cross-sectional view illustrating Example 3 of the semiconductor device according to the embodiment.
- FIG. 20 is a plan layout view showing a conventional semiconductor device.
- FIG. 21 is a cross-sectional view showing a conventional semiconductor device.
- FIG. 22 is a cross-sectional view showing a conventional semiconductor device.
- FIG. 1 is a plan layout diagram illustrating Example 1 of the semiconductor device according to the embodiment.
- the gate insulating film, the interlayer insulating film, the emitter electrode, and the passivation film are omitted.
- 2 is a cross-sectional view taken along the line BB in FIG.
- the cutting line BB is along the first gate insulating film on the sidewall of the trench.
- FIG. 3 is a cross-sectional view taken along the line CC in FIG.
- the cutting line CC is along the second gate electrode and the conductive region.
- FIG. 4 is a cross-sectional view taken along the line DD in FIG.
- the cutting line DD crosses the second gate electrode and the emitter cell.
- a plurality of island-shaped emitter cells (cells) 22 are provided on the first main surface of the n ⁇ layer 21 so as to be separated from each other.
- the n ⁇ layer 21 (first conductivity type semiconductor layer) may be a part of an n-type semiconductor substrate, for example.
- the emitter cell 22 is provided with a p base region (second conductivity type semiconductor region) 23 and an n + emitter region (first conductivity type semiconductor region) 24.
- the p + region 31 may be provided in the p base region 23.
- the p + region 31 is provided away from the trench 25.
- a trench 25 is formed on both sides of the emitter cell 22.
- the n + emitter region 24 is in contact with the side wall of the trench 25 in contact with the emitter cell 22.
- the plurality of trenches 25 are arranged side by side in a direction crossing the longitudinal direction of the trenches 25.
- a plurality of trench groups 32 each including a plurality of trenches 25 arranged side by side are provided.
- the trench groups 32 are spaced apart from each other in the longitudinal direction of the trench 25.
- the emitter cells 22 are arranged, for example, every other region with respect to a plurality of regions sandwiched between adjacent trenches 25.
- the region where the emitter cell 22 is not disposed is the n ⁇ layer 21.
- the emitter cells 22 are arranged alternately. That is, the emitter cells 22 and n In certain Trenches 32 - and repetition period of the layers 21, the emitter cells 22 and n in neighboring trench group 32 of the trench group 32 - the repetition period of the layers 21, half period shift ing.
- a first gate electrode (first electrode) 26 is embedded in the trench 25 via a first gate insulating film (first insulating film, not shown).
- a second gate electrode (second insulating film, not shown) is interposed via a second gate electrode (second insulating film).
- Electrode) 27 is provided.
- the second gate electrode 27 electrically connects the first gate electrodes 26 in the trenches 25 on both sides of the emitter cell 22.
- a conductive region 28 is provided on the surface of a region sandwiched between adjacent trenches 25 of n ⁇ layer 21 via a third gate insulating film (third insulating film, not shown in the drawing).
- the conductive region 28 electrically connects the second gate electrodes 27 to each other.
- the second gate electrode 27 and the conductive region 28 also serve as a wiring for transmitting a gate signal.
- the first gate electrode 26, the second gate electrode 27, and the conductive region 28 may be made of doped polysilicon, for example.
- the first gate insulating film, the second gate insulating film, and the third gate insulating film may be formed of an oxide film, for example.
- a contact region 29 is in contact with the n + emitter region 24 and the p + region 31.
- the n + emitter region 24 and the p base region 23 are short-circuited by a contact region 29.
- the contact region 29 is insulated from the second gate electrode 27 by an interlayer insulating film (not shown).
- the emitter cell 22 of one trench group 32 and the emitter cell 22 of the other trench group 32 are separated by a distance L in the longitudinal direction of the trench 25.
- the second gate electrode 27 and conductive region 28 of one trench group 32 and the second gate electrode 27 and conductive region 28 of the other trench group 32 are separated by a distance W / in the longitudinal direction of the trench 25. 2 apart.
- the center point of the second gate electrode 27 in one trench group 32 and the center point of the adjacent conductive region 28 indicates the active unit cell 33. Accordingly, the dimension of the active unit cell 33 in the longitudinal direction of the trench 25 is W / 2.
- the values of L and W in Example 1 are the values of L in the micro cell structure IGBT shown in FIG. It does not mean that it is the same as the value of W. That is, the value of L and the value of W in Example 1 may be the same as or different from the values of L and W in the microcell structure IGBT shown in FIG.
- a breakdown voltage equivalent to that of the micro cell structure IGBT shown in FIG. 20 can be obtained.
- the trenches 25 sandwiching the emitter cell 22 are connected to each other.
- the emitter cell 22 may be provided in a region closed by the trench 25 having a planar shape.
- the first main surface of the semiconductor device (the main surface on the same side as the first main surface of the n ⁇ layer 21) is covered with an interlayer insulating film 34.
- An emitter electrode (third electrode) 35 is provided on the interlayer insulating film 34.
- the emitter electrode 35 is electrically connected to a contact region 29 that penetrates the interlayer insulating film 34. That is, the emitter electrode 35 is electrically connected to the n + emitter region 24 and the p + region 31 through the contact region 29.
- a p collector layer (second conductivity type semiconductor layer) 36 is provided on the second main surface of the semiconductor device. Further, as shown in the figure, between the p collector layer 36 and the n ⁇ layer 21, an n buffer layer or an n field stop layer (collectively referred to as an n buffer layer 37) having a lower resistivity than the n ⁇ layer 21. May be provided. Although the n buffer layer 37 may not be provided, it is assumed here that it is provided.
- a collector electrode (fourth electrode) 38 is electrically connected to the p collector layer 36.
- the semiconductor device is covered with a passivation film 39 provided on the uppermost layer of the first main surface.
- the n + emitter region 24 is formed to be self-aligned with the second gate electrode 27.
- a second gate insulating film 40 is provided between the second gate electrode 27 and the p base region 23.
- the p + region 31 is provided adjacent to the n + emitter region 24.
- the first gate insulating film 41 is provided along the side wall and the bottom surface of the trench 25. In the trench 25, a region inside the first gate insulating film 41 is filled with the first gate electrode 26. A third gate insulating film 42 is provided between the conductive region 28 and the n ⁇ layer 21.
- the p base region 23 is shallower than the trench 25. Further, when the p base region 23 is formed in the semiconductor substrate by ion implantation and thermal diffusion of p-type impurities such as shelf ions, and then the first gate electrode 26, the second gate electrode 27, and the conductive region 28 are formed. The p base region 23 has a uniform depth.
- first gate electrode 26, the second gate electrode 27, and the conductive region 28 are formed first, and p is formed on the semiconductor substrate so as to be self-aligned with the first gate electrode 26, the second gate electrode 27, and the conductive region 28.
- Thermal diffusion may be performed by ion implantation of type impurities.
- FIG. 5 is a chip layout diagram showing Example 1 of the semiconductor device according to the embodiment.
- the second gate electrode 27 and the conductive region 28 also serve as the gate signal wiring 51.
- the gate signal wiring 51 is electrically connected to the gate pad 55 via the gate signal wiring 53 provided inside the termination structure 52 on the outer periphery of the chip and the contact region 54.
- an emitter pad is provided in a region surrounded by the termination structure 52 so as to cover a region excluding the gate pad 55.
- the capacity of each part which becomes a mirror capacity newly when compared with the conventional microcell structure IGBT shown in FIG. 20 is as follows.
- the capacitance C s of the third gate insulating film 42 between the conductive region 28 and the n ⁇ layer 21 is expressed by the following equation (2).
- W Mesa is the width of the mesa portion between the trenches
- 2L Gate is the length of the second gate insulating film 40 and the third gate insulating film 42 in the longitudinal direction of the trench 25.
- the second gate insulating film 40 and the third gate insulating film 42 have the same dimension in the longitudinal direction of the trench 25.
- the capacitance C bottom of the first gate insulating film 41 at the bottom of the trench between the first gate electrode 26 and the n ⁇ layer 21 is expressed by the following (4). It is expressed by an expression.
- the capacitance C Trench_end of the first gate insulating film 41 at the trench end between the first gate electrode 26 and the n ⁇ layer 21 is expressed by the following equation (5).
- the capacitances expressed by the above equations (2) to (5) become new mirror capacitances.
- the mirror capacitance of the semiconductor device of Example 1 is smaller than the mirror capacitance C ex (see the above formula (1)) of the conventional microcell structure IGBT shown in FIG.
- the mirror capacitance of the semiconductor device of Example 1 is reduced by the mirror capacitance C reduced expressed by the following equation (6) with respect to the mirror capacitance of the conventional microcell structure IGBT shown in FIG.
- the value of W when the longitudinal dimension of the trench 25 of the active unit cell 33 is W / 2 is 31.6 ⁇ m.
- the value of the depth D Trench of the trench 25 is set to 5 ⁇ m.
- the value of the width W Trench of the trench 25 is 1.4 ⁇ m.
- the value of L Gate when the length of the trench 25 in the longitudinal direction of the second gate insulating film 40 and the third gate insulating film 42 is 2 L Gate is 1 ⁇ m.
- the value of the width W Mesa of the mesa portion between the trenches is set to 2.2 ⁇ m.
- the value of the width W pbase of the p base region 23 is 10 ⁇ m.
- the depth of the p base region 23 is 2.5 ⁇ m.
- the value of the thickness t ox of the first gate insulating film 41, the second gate insulating film 40, and the third gate insulating film 42 is set to 0.1 ⁇ m.
- the mirror capacitance of each part of the semiconductor device of Example 1 is calculated as follows.
- the value of C s is 4.4 units.
- the value of C sidewall is 10 units.
- the value of C bottom is 2.4 units.
- the value of C Trench_end is 12 units.
- the value of the capacitance C gc ′ sidewall1 in the region excluding the C sidewall region is 70 units.
- the value of the capacitance C gc′bottom of the region excluding the C bottom region is 16.8 units.
- the value of the capacitance C gc ′ sidewall 2 in the region on the p base region 23 side is 40 units.
- the total mirror capacitance C gc of the semiconductor device of Example 1 obtained by adding these is 155.6 units. Further, when the temperature is 425 K and the value of the collector-emitter voltage V ce is 2.0 V, the value of the on-current I on per active unit cell 33 is 1.782 ⁇ 10 ⁇ 4 A.
- a conventional microcell structure IGBT shown in FIG. 20 is taken as a conventional example.
- the distance L between the emitter cells 7 arranged on both sides of the same trench 1 is 8 ⁇ m.
- the value of W when the longitudinal dimension of the trench 1 of the active unit cell 16 is W / 2 is 39.6 ⁇ m.
- the depth D Trench value of the trench 1 is set to 5 ⁇ m.
- the value of the width W Trench of the trench 1 is set to 1.4 ⁇ m.
- the value of the width W Mesa of the mesa portion between the trenches is set to 2.2 ⁇ m.
- the value of the width W pbase of the p base region 4 is 8 ⁇ m.
- the value of the thickness t ox of the gate insulating film 3 is set to 0.1 ⁇ m.
- the mirror capacitance of each part of the conventional semiconductor device is calculated as follows.
- the value of C ex is 91.2 units.
- the value of the capacitance C gc ′ sidewall 1 of the gate insulating film 3 on the trench sidewall between the gate electrode 2 and the n ⁇ layer 12 on the opposite side of the p base region 4 is 70 units.
- the value of the capacitance C gc′bottom of the gate insulating film 3 at the bottom of the trench between the gate electrode 2 and the n ⁇ layer 12 is 16.8 units.
- the value of the capacitance C gc ′ sidewall 2 in the region on the p base region 4 side is 35 units.
- the total mirror capacitance C gc of the conventional semiconductor device obtained by adding these is 213 units.
- the value of the on-current I on per active unit cell 16 is 1.780 ⁇ 10 ⁇ 4 A.
- the mirror capacitance of the semiconductor device of the first embodiment is higher than that of the conventional example per active unit cell. 27% decrease.
- the mirror capacitance of the semiconductor device of the first embodiment is reduced by 27% compared to the conventional example.
- the mirror capacitance of the semiconductor device of Example 1 is reduced by 22% compared to the conventional example.
- the active area of the semiconductor device of Example 1 is the same as that of the semiconductor device of the conventional example, so that the number of unit cells in the semiconductor device of Example 1 is This is because it increases in inverse proportion to.
- the number of unit cells when the operating current density of the element is kept constant is the value of W of the conventional semiconductor device as the number of unit cells when there is no limit on scaling of the current density Multiply (39.6 ⁇ m) and divide by the W value (31.6 ⁇ m) of the semiconductor device of Example 1.
- FIG. 6 and 7 are characteristic diagrams showing simulation results of the I ce -V ce characteristics of the semiconductor device of Example 1 and the conventional semiconductor device.
- I ce is the collector-emitter current.
- the simulation result shown in FIG. 6 is a result in an off state at room temperature.
- FIG. 6 shows that the semiconductor device of Example 1 has a breakdown voltage equal to or higher than that of the conventional semiconductor device.
- Simulation results shown in FIG. 7 is a temperature 425K, the gate - the value of the emitter voltage V ge is the result when the 15V. 7 that the semiconductor device of Example 1 has a higher saturation current density than the semiconductor device of the conventional example.
- the semiconductor device of the first embodiment in order to reduce the saturation current density, the length of the n + emitter region 24 in the longitudinal direction of the trench 25 is shortened, the value of the L Gate is decreased, and Accordingly, the value of Wpbase may be reduced.
- the simulation results shown in FIGS. 6 and 7 are under the following conditions.
- the emitter length in the direction parallel to the trench is 2.4 ⁇ m.
- the concentration of the n ⁇ layers 21 and 12 is 9 ⁇ 10 13 cm ⁇ 3 .
- the peak concentration at a depth of 0.2 ⁇ m from the collector electrodes 38 and 15 is set to 3 ⁇ 10 17 cm ⁇ 3 .
- the depth Xj of the pn junction between the p collector layers 36 and 14 and the n buffer layers 37 and 13 is set to 0.8 ⁇ m to 0.9 ⁇ m.
- the thickness of the n buffer layers 37 and 13 is about 30 ⁇ m.
- the peak concentration of the n buffer layers 37 and 13 near the depth Xj of the pn junction with the p collector layers 36 and 14 is set to 2.2 ⁇ 10 15 cm ⁇ 3 .
- the thickness of the semiconductor substrate is 115 ⁇ m.
- the number of unit cells is 8.42 ⁇ 10 5 so that the value of the on-current I on is 150 A when the value of the gate-emitter voltage V ge is 15 V and the value of V ce is 2.0 V. To do. This corresponds to the case where there is no limitation on the scaling of the current density in the calculation result described above.
- the mirror capacitance of the semiconductor device 61 can be evaluated by simulating the turn-on process of the semiconductor device 61 in the evaluation circuit in which the load resistor 62 is connected to the collector of the semiconductor device 61.
- reference numeral 63 is a gate resistance
- reference numeral 64 is a constant current source
- reference numeral 65 is a power source.
- 600 V is applied as the bus voltage V BUS to the collector of the semiconductor device 61
- the value of the load resistance RL is about 4 ⁇ .
- the value of the gate resistor R g and 10 [Omega, the value of peak current I pk of the constant current source 64 and 0.5A. Under these conditions, the mirror capacitance can be evaluated by simulating the turn-on process at a temperature of 425 K using the semiconductor device of Example 1 and the semiconductor device of the conventional example as the 120A class.
- FIG. 9 is a characteristic diagram showing simulation results of the turn-on process of the semiconductor device of Example 1 and the conventional semiconductor device.
- the stagnation period of the gate-emitter voltage Vge can be obtained.
- the length of the stagnation period of the gate-emitter voltage Vge depends on the mirror capacitance. As the mirror capacitance increases, the stagnation period of the gate-emitter voltage Vge increases. Therefore, the magnitude of the mirror capacitance can be evaluated by obtaining the stagnation period of the gate-emitter voltage Vge .
- the start time t1 of the stagnation period of the gate-emitter voltage V ge is 3.00 ⁇ 10 ⁇ 7 sec, and the stagnation of the gate-emitter voltage V ge The end time t2 of the period is 9.00 ⁇ 10 ⁇ 7 sec. Therefore, the stagnation period of the gate-emitter voltage V ge is 6.00 ⁇ 10 ⁇ 7 sec.
- the start time t1 of the stagnation period of the gate-emitter voltage V ge is 3.00 ⁇ 10 ⁇ 7 sec
- the end time t2 of the stagnation period of the gate-emitter voltage V ge is 1. 22 ⁇ 10 ⁇ 6 sec. Therefore, the stagnation period of the gate-emitter voltage V ge is 9.20 ⁇ 10 ⁇ 7 sec. From these results, the mirror capacitance of the semiconductor device of Example 1 is reduced by 34.78% compared to the conventional example.
- the active area of the semiconductor device of the first embodiment is the same as that of the conventional semiconductor device, so that the number of unit cells of the semiconductor device of the first embodiment as described above. Will increase. As the number of unit cells increases, the mirror capacity reduction rate decreases.
- FIG. 10 is a plan layout diagram illustrating Example 2 of the semiconductor device according to the embodiment.
- the gate insulating film, the interlayer insulating film, the emitter electrode, and the passivation film are omitted.
- FIG. 11 is a cross-sectional view taken along line EE in FIG.
- the cutting line EE is along the first gate insulating film on the sidewall of the trench.
- 12 is a cross-sectional view taken along a cutting line FF in FIG.
- the cutting line FF is along the second gate electrode and the conductive region.
- 13 is a cross-sectional view taken along a cutting line GG in FIG.
- the cutting line GG crosses the trench, the second gate electrode and the emitter cell.
- the semiconductor device of the second embodiment is different from the semiconductor device of the first embodiment in the following points.
- the trenches 25 sandwiching the emitter cell 22 are connected so that, for example, the planar shape forms a loop. Therefore, the first gate electrode 26 appears in the cross section along the first gate insulating film 41 on the sidewall of the trench (see FIG. 11).
- the emitter cell 22 is provided in a region closed by, for example, a loop-shaped trench 25.
- the trench 25, the first gate electrode 26, and the first gate insulating film 41 appear in a cross section crossing the trench 25, the second gate electrode 27, and the emitter cell 22, and the p base region 23 is sandwiched between the trenches 25 (see FIG. 13). ).
- emitter cells 71 are also arranged in a part of the region between adjacent regions closed by the trench 25. In the example shown in FIG. 10, for example, every other emitter cell 71 is arranged in a plurality of regions between adjacent regions closed by the trench 25. In adjacent trench groups 32, the emitter cells 71 are arranged alternately. That is, the emitter cells 71 and n In certain Trenches 32 - and repetition period of the layers 21, emitter cells 71 and n in neighboring trench group 32 of the trench group 32 - the repetition period of the layers 21, half period shift ing.
- a second gate insulating film 72 is provided on the surface of the region sandwiched between the n + emitter regions 24 of the p base region 23. ing.
- a second gate electrode 73 is provided on the second gate insulating film 72. Similar to the first embodiment, the second gate electrode 73 electrically connects the first gate electrodes 26 to each other.
- the p base region 23 extends longer in the longitudinal direction of the trench 25 than the trench 25. Therefore, in the cross section along the second gate electrodes 27 and 73 and the conductive region 28, the emitter cell 71, the second gate insulating film 72, and the second gate electrode 73 disposed between the regions closed by the trench 25 are provided. Appears (see FIG. 12).
- the cutting line HH in FIG. 10 does not cross the trench 25 but crosses the second gate electrode 73 and the emitter cell 71.
- the configuration of the cross section along the cutting line HH is the same as the configuration of the cross section shown in FIG. 4 of the first embodiment, but in FIG. 4, the second gate electrode 27 and the second gate insulating film 40 are the second gate electrode, respectively. 73 and the second gate insulating film 72.
- FIG. 14 is a chip layout diagram showing Example 2 of the semiconductor device according to the embodiment.
- the second gate electrode 73 also serves as the gate signal wiring 51 together with the second gate electrode 27 and the conductive region 28.
- Other configurations of the semiconductor device of the second embodiment are the same as those of the first embodiment.
- the capacity of each part that becomes a mirror capacity newly when compared with the conventional microcell structure IGBT shown in FIG. 20 is as follows.
- C s , C sidewall, and C bottom are expressed by the formulas (2), (3), and (4), respectively.
- the capacitance C Trench_end of the first gate insulating film 41 at the trench end between the first gate electrode 26 and the n ⁇ layer 21 is expressed by the following equation (7).
- the capacitances expressed by the above equations (2) to (4) and (7) become new mirror capacitances. .
- the mirror capacitance of the semiconductor device of Example 2 is smaller than the mirror capacitance C ex (see the above formula (1)) of the conventional microcell structure IGBT shown in FIG.
- the mirror capacitance of the semiconductor device of the second embodiment is reduced by the mirror capacitance C reduced expressed by the following equation (8) with respect to the mirror capacitance of the conventional microcell structure IGBT shown in FIG.
- the value of W is 28 ⁇ m.
- the value of D Trench is set to 5 ⁇ m.
- the value of W Trench is set to 1.4 ⁇ m.
- the value of L Gate is set to 0.8 ⁇ m.
- the value of W Mesa is set to 2.2 ⁇ m.
- the value of W pbase is set to 10 ⁇ m.
- the value of t ox is set to 0.1 ⁇ m.
- the mirror capacitance of each part of the semiconductor device of Example 2 is calculated as follows.
- the value of C s is 3.52 units.
- the value of C sidewall is 8 units.
- the value of C bottom is 1.92 units.
- the value of C Trench_end is 72.35 units.
- the value of C gc'sidewall1 is 55 units.
- the value of C gc′bottom is 26.4 units.
- the value of C gc'sidewall2 is 80 units. Accordingly, the total mirror capacitance C gc of the semiconductor device of the second embodiment obtained by adding these is 247.19 units.
- a conventional microcell structure IGBT shown in FIG. 20 is taken as a conventional example.
- the value of L is 8 ⁇ m.
- the value of W is 39.6 ⁇ m.
- the value of D Trench is set to 5 ⁇ m.
- the value of W Trench is set to 1.4 ⁇ m.
- the value of W Mesa is set to 2.2 ⁇ m.
- the value of W pbase is set to 8 ⁇ m.
- the value of t ox is set to 0.1 ⁇ m.
- the mirror capacitance of each part of the conventional semiconductor device is calculated as follows.
- the value of the C ex becomes 179.2 units.
- the value of C gc'sidewall1 is 55 units.
- the value of C gc′bottom is 26.4 units.
- the value of C gc'sidewall2 is 70 units. Therefore, the value of the total mirror capacitance C gc of the conventional semiconductor device obtained by adding these is 330.6 units.
- the mirror capacitance of the semiconductor device of Example 2 is reduced by 25% per active unit cell compared to the conventional example.
- the active area of the semiconductor device of Example 2 is the same as that of the conventional semiconductor device.
- the reduction rate of the mirror capacitance is obtained by multiplying the reduction rate (25%) when the current density scaling is not limited by the W value (28 ⁇ m) of the semiconductor device of the second embodiment. Divided by the value of W (39.6 ⁇ m). That is, when the operating current density of the element is kept constant, the mirror capacitance of the semiconductor device of Example 2 is reduced by 18% compared to the conventional example.
- FIG. 15 is a characteristic diagram showing simulation results of the I ce -V ce characteristics of the semiconductor device of Example 2 and the conventional semiconductor device.
- the simulation results shown in FIG. 15 are results in an off state at room temperature. From FIG. 15, it can be seen that the semiconductor device of Example 2 has a breakdown voltage equivalent to that of the conventional semiconductor device.
- FIG. 16 is a characteristic diagram showing simulation results of J ce -V ce characteristics of the semiconductor device of Example 2 and the conventional semiconductor device.
- J ce is the collector-emitter current density.
- the simulation result shown in FIG. 16 is a result when the temperature is 423 K and the value of the gate-emitter voltage Vge is 15V.
- FIG. 16 shows that the semiconductor device of Example 2 has a higher saturation current density than the semiconductor device of the conventional example.
- SCSOA Short Circuit Safe Operating Area
- the simulation results shown in FIGS. 15 and 16 are under the following conditions.
- the peak concentration at a depth of 0.2 ⁇ m from the collector electrodes 38 and 15 is set to 3 ⁇ 10 17 cm ⁇ 3 .
- the depth Xj of the pn junction between the p collector layers 36 and 14 and the n buffer layers 37 and 13 is set to 0.8 ⁇ m to 0.9 ⁇ m.
- the thickness of the n buffer layers 37 and 13 is about 30 ⁇ m.
- the peak concentration of the n buffer layers 37 and 13 near the depth Xj of the pn junction with the p collector layers 36 and 14 is set to 2.2 ⁇ 10 15 cm ⁇ 3 .
- the thickness of the semiconductor substrate is 115 ⁇ m.
- the concentration of the n ⁇ layer 21 is set to 6.5 ⁇ 10 13 cm ⁇ 3 .
- the emitter length in the direction parallel to the trench is set to 0.6 ⁇ m.
- the emitter length in the direction parallel to the trench in the three emitter cells 22 and 71 is 1.8 ⁇ m.
- the semicircular portion of the loop-shaped trench 25 is approximated by a quadrangle.
- the concentration of the n ⁇ layer 12 is 9 ⁇ 10 13 cm ⁇ 3 .
- the emitter length in the direction parallel to the trench is 2.4 ⁇ m.
- FIG. 17 shows the result of evaluating the mirror capacitance of the semiconductor device of Example 2 and the conventional semiconductor device using the evaluation circuit shown in FIG.
- FIG. 17 is a characteristic diagram showing simulation results of the turn-on process of the semiconductor device of Example 2 and the conventional semiconductor device.
- the simulation conditions are that the semiconductor device of Example 2 and the semiconductor device of the conventional example are both 150 A class, the operating temperature is 423 K, and the active area is 1 cm 2 .
- the start time t1 and end time t2 of the stagnation period of the gate-emitter voltage Vge are obtained in the same manner as in the first embodiment.
- t1 is 4.84 ⁇ 10 ⁇ 7 sec and t2 is 1.50 ⁇ 10 ⁇ 6 sec. Therefore, the stagnation period of the gate-emitter voltage V ge is 1.016 ⁇ 10 ⁇ 6 sec.
- t1 is 3.01 ⁇ 10 ⁇ 7 sec and t2 is 1.77 ⁇ 10 ⁇ 6 sec. Therefore, the stagnation period of the gate-emitter voltage V ge is 1.469 ⁇ 10 ⁇ 6 sec.
- the mirror capacitance of the semiconductor device of Example 2 is reduced by 30.83% compared to the conventional example. Further, the ratio (C gc / C ge ) between the mirror capacitance and the input capacitance C ge of the semiconductor device of Example 2 is about 1 ⁇ 4 of the ratio of the mirror capacitance and the input capacitance C ge of the conventional semiconductor device. Become.
- FIG. 18 is a plan layout diagram illustrating Example 3 of the semiconductor device according to the embodiment.
- the gate insulating film, the interlayer insulating film, the emitter electrode, and the passivation film are omitted.
- FIG. 19 is a cross-sectional view taken along the line II in FIG.
- the cutting line II is along the first gate insulating film on the trench sidewall not in contact with the n + emitter region 24.
- the configurations of the cross sections along the cutting line EE, the cutting line FF, the cutting line GG, and the cutting line HH of FIG. 18 are respectively the cutting line EE and the cutting line FF of FIG. F, the configuration of the cross section along the cutting line GG and the cutting line HH is the same.
- the semiconductor device of the third embodiment is different from the semiconductor device of the second embodiment in the following points.
- both ends of the n + emitter region 24 are in contact with the trench sidewall (see FIG. 10).
- the semiconductor device of Example 3 in the emitter cell 22 provided in the region closed by the trench 25, one end of the n + emitter region 24 is separated from the trench sidewall.
- Other configurations are the same as those of the second embodiment.
- the channel length of the semiconductor device of the third embodiment is shorter than that of the semiconductor device of the second embodiment, so that the saturation current density is suppressed. be able to.
- the simulation result of the J ce -V ce characteristic of the semiconductor device of Example 3 is also shown in FIG. The simulation conditions are the same as those in the second embodiment.
- FIG. 16 shows that the saturation current density of the semiconductor device of Example 3 is suppressed more than that of the semiconductor device of Example 2.
- the trench gate structure is provided only in a region where the emitter cells 22 and 71 are present, and is not provided in a region between the emitter cells 22 and 71 where the emitter cells 22 and 71 are not present. Therefore, the first gate insulating film 41 in the gate trench structure is shorter than the conventional one. Further, the second gate electrodes 27 and 73 and the conductive region 28 can transmit a gate signal to the first gate electrodes 26 of the emitter cells 22 and 71 scattered in an island shape. In the second and third embodiments, a gate signal can also be transmitted to the second gate electrode 73. Therefore, the mirror capacity can be reduced. By Miller capacitance is reduced, the gate during turn-on and turn-off - stagnation period emitter voltage V ge is shortened.
- the switching loss is reduced, and the trade-off between the turn-off loss Eoff and the on-voltage Von can be improved. Further, even when the gate voltage is raised due to the influence of the bus (collector) voltage surge in the off state, the amount of increase in the gate voltage is small, so that the probability of malfunctioning and transitioning to the on state is reduced.
- the present invention is not limited to the above-described embodiments, and various modifications can be made.
- numerical values such as dimensions, concentrations, and electrical characteristics described in the embodiments are examples, and the present invention is not limited to these values.
- the first conductivity type is n-type and the second conductivity type is p-type.
- the present invention similarly holds when the first conductivity type is p-type and the second conductivity type is n-type. .
- the semiconductor device according to the present invention is useful for a semiconductor device having a trench gate structure, and is particularly suitable for an IGBT.
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Abstract
Description
図1は、実施の形態にかかる半導体装置の実施例1を示す平面レイアウト図である。図1では、ゲート絶縁膜、層間絶縁膜、エミッタ電極およびパッシベーション膜が省略されている。図2は、図1の切断線B-Bにおける断面図である。切断線B-Bは、トレンチ側壁の第1ゲート絶縁膜に沿う。図3は、図1の切断線C-Cにおける断面図である。切断線C-Cは、第2ゲート電極および導電領域に沿う。図4は、図1の切断線D-Dにおける断面図である。切断線D-Dは、第2ゲート電極およびエミッタセルを横切る。
図10は、実施の形態にかかる半導体装置の実施例2を示す平面レイアウト図である。図10では、ゲート絶縁膜、層間絶縁膜、エミッタ電極およびパッシベーション膜が省略されている。図11は、図10の切断線E-Eにおける断面図である。切断線E-Eは、トレンチ側壁の第1ゲート絶縁膜に沿う。図12は、図10の切断線F-Fにおける断面図である。切断線F-Fは、第2ゲート電極および導電領域に沿う。図13は、図10の切断線G-Gにおける断面図である。切断線G-Gは、トレンチ、第2ゲート電極およびエミッタセルを横切る。
図18は、実施の形態にかかる半導体装置の実施例3を示す平面レイアウト図である。図18では、ゲート絶縁膜、層間絶縁膜、エミッタ電極およびパッシベーション膜が省略されている。図19は、図18の切断線I-Iにおける断面図である。切断線I-Iは、n+エミッタ領域24に接していないトレンチ側壁の第1ゲート絶縁膜に沿う。図18の切断線E-E、切断線F-F、切断線G-Gおよび切断線H-Hにおける断面の構成は、それぞれ実施例2の図10の切断線E-E、切断線F-F、切断線G-Gおよび切断線H-Hにおける断面の構成と同じである。
22,71 セル
23 第2導電型半導体領域
24 第1導電型半導体領域
25 トレンチ
26 第1電極
27,73 第2電極
28 導電領域
29 コンタクト領域
32 トレンチ群
35 第3電極
36 第2導電型半導体層
38 第4電極
40,72 第2絶縁膜
41 第1絶縁膜
42 第3絶縁膜
Claims (12)
- 第1導電型半導体層と、
前記第1導電型半導体層の第1主面に互いに離れて設けられた複数の島状のセルと、
前記セルに設けられた第2導電型半導体領域と、
前記第2導電型半導体領域に設けられた第1導電型半導体領域と、
前記セルの両側に前記第2導電型半導体領域よりも深いトレンチが形成され、該トレンチ内に設けられた第1絶縁膜と、
前記第1絶縁膜を介して前記トレンチ内に埋め込まれた第1電極と、
前記第2導電型半導体領域の、前記第1導電型半導体領域に挟まれた領域の表面上に設けられた第2絶縁膜と、
前記第2絶縁膜上に設けられた、前記第1電極同士を電気的に接続する第2電極と、
前記第1導電型半導体層の表面上に設けられた第3絶縁膜と、
前記第3絶縁膜上に設けられた、前記第2電極同士を電気的に接続する導電領域と、
前記第2電極から絶縁され、かつ前記第2導電型半導体領域とその領域に設けられた前記第1導電型半導体領域とを短絡するコンタクト領域と、
を備えることを特徴とする半導体装置。 - 前記第2電極および前記導電領域は、ゲート信号を伝送する配線を兼ねることを特徴とする請求項1に記載の半導体装置。
- それぞれが複数の前記トレンチを含む複数のトレンチ群が互いに離れて配置されており、
それぞれの前記トレンチ群においては、前記トレンチの長手方向と交差する方向に複数の前記トレンチが並んで配置されており、
隣り合うトレンチ群においては、前記セルが互い違いに配置されていることを特徴とする請求項1に記載の半導体装置。 - 前記第2電極および前記導電領域は、ゲート信号を伝送する配線を兼ねることを特徴とする請求項3に記載の半導体装置。
- 前記コンタクト領域に電気的に接続する第3電極と、
前記第1導電型半導体層の第2主面に設けられた第2導電型半導体層と、
前記第2導電型半導体層に電気的に接続する第4電極と、
を備えることを特徴とする請求項4に記載の半導体装置。 - 前記セルの両側に配置された前記トレンチ同士がつながっており、
前記セルが、該セルの両側に配置された前記トレンチによって閉じられた領域に設けられていることを特徴とする請求項1に記載の半導体装置。 - 前記第2電極および前記導電領域は、ゲート信号を伝送する配線を兼ねることを特徴とする請求項6に記載の半導体装置。
- 隣り合う、前記トレンチによって閉じられた領域同士の間の一部の領域にも、前記セルが配置されており、
前記トレンチによって閉じられた領域同士の間の前記セルに設けられた第2導電型半導体領域は、前記トレンチによって閉じられた領域を囲む該トレンチよりも該トレンチの長手方向に長く伸びており、
前記トレンチによって閉じられた領域同士の間の前記セルに設けられた前記第2導電型半導体領域の、該第2導電型半導体領域に設けられた第1導電型半導体領域に挟まれた領域の表面上にも、前記第2絶縁膜を介して、前記第1電極同士を電気的に接続する前記第2電極が設けられていることを特徴とする請求項6に記載の半導体装置。 - 前記第2電極および前記導電領域は、ゲート信号を伝送する配線を兼ねることを特徴とする請求項8に記載の半導体装置。
- それぞれが複数の前記トレンチを含む複数のトレンチ群が互いに離れて配置されており、
それぞれの前記トレンチ群においては、前記トレンチの長手方向と交差する方向に複数の前記トレンチが並んで配置されており、
隣り合うトレンチ群においては、前記トレンチによって閉じられた領域同士の間の前記セルが互い違いに配置されていることを特徴とする請求項8に記載の半導体装置。 - 前記第2電極および前記導電領域は、ゲート信号を伝送する配線を兼ねることを特徴とする請求項10に記載の半導体装置。
- 前記コンタクト領域に電気的に接続する第3電極と、
前記第1導電型半導体層の第2主面に設けられた第2導電型半導体層と、
前記第2導電型半導体層に電気的に接続する第4電極と、
を備えることを特徴とする請求項11に記載の半導体装置。
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- 2009-12-18 WO PCT/JP2009/071186 patent/WO2011074124A1/ja active Application Filing
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JP2003258253A (ja) * | 2001-12-26 | 2003-09-12 | Toshiba Corp | 絶縁ゲート型バイポーラトランジスタ |
JP2005175425A (ja) * | 2003-11-20 | 2005-06-30 | Fuji Electric Device Technology Co Ltd | 絶縁ゲート型半導体装置 |
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JPWO2011074124A1 (ja) | 2013-04-25 |
JP5516600B2 (ja) | 2014-06-11 |
US8759911B2 (en) | 2014-06-24 |
US20120248532A1 (en) | 2012-10-04 |
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