WO2013021636A1 - 炭化珪素半導体装置およびその製造方法 - Google Patents
炭化珪素半導体装置およびその製造方法 Download PDFInfo
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- WO2013021636A1 WO2013021636A1 PCT/JP2012/005040 JP2012005040W WO2013021636A1 WO 2013021636 A1 WO2013021636 A1 WO 2013021636A1 JP 2012005040 W JP2012005040 W JP 2012005040W WO 2013021636 A1 WO2013021636 A1 WO 2013021636A1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 127
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 111
- 238000004519 manufacturing process Methods 0.000 title claims description 47
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Definitions
- the present disclosure relates to a silicon carbide (hereinafter referred to as SiC) semiconductor device provided with an outer peripheral withstand voltage structure region so as to surround an outer periphery of a transistor cell region in which cells such as JFETs or MOSFETs are formed, and a manufacturing method thereof.
- SiC silicon carbide
- an SiC semiconductor device including a JFET having a trench structure has been proposed (see, for example, Patent Document 1).
- this SiC semiconductor device an N ⁇ type drift layer, a P + type first gate region, and an N + type source region are formed in this order on an N + type SiC substrate, and then a trench penetrating them is formed.
- an N ⁇ type channel layer and a P + type second gate region are formed in the trench.
- the source electrode electrically connected to the N + type source region and the N + type SiC substrate are electrically connected.
- An operation is performed in which a drain current flows between the drain electrode connected to the first electrode and the second electrode.
- a mesa structure is formed by forming a recess in the outer peripheral region surrounding the periphery of the transistor cell region in which the JFET is formed, and a P-type is formed at the boundary position of the recess. It is conceivable to form a RESURF layer or a P-type guard ring layer. These P-type RESURF layers and P-type guard ring layers are formed by selectively implanting P-type impurities after forming the recesses, but the following problems occur. This problem will be described with reference to FIG.
- 18 (a) and 18 (b) are cross-sectional views showing a process of forming a P-type RESURF layer as an outer peripheral pressure resistant structure.
- an N ⁇ type drift layer J 2 a P + type first gate region J 3 and an N + type source region J 4 are formed in order on an N + type SiC substrate J 1, and then a trench is formed therethrough.
- J5 is formed, and an N ⁇ -type channel layer J6 and a P + -type second gate region J7 are formed in the trench J5 to constitute the basic structure of the JFET.
- a recess J9 deeper than the first gate region J3 is formed by selective etching using a different mask.
- P-type RESURF layer J10 is formed by selectively ion-implanting P-type impurities.
- the ion implantation of the P-type impurity for forming the P-type RESURF layer J10 is performed from the direction normal to the substrate surface as shown in FIG. 18A and as shown in FIG. 18B. It is conceivable that the oblique ion implantation is performed at an angle inclined by a predetermined angle with respect to the normal direction to the substrate surface.
- the P-type RESURF layer J10 is not formed on the side surface of the recess J9 and the corner portion serving as the boundary between the side surface and the bottom surface. For this reason, the first gate region J3 and the p-type RESURF layer J10 are separated from the side surface of the recess J9, and the drain breakdown voltage at the time of OFF is significantly reduced to 400 V or less, for example. That is, since the P-type RESURF layer J10 does not exist in the corner portion of the recess J9, electric field concentration occurs in this portion, and the drain breakdown voltage is reduced.
- the drain breakdown voltage at the time of OFF can be improved to, for example, about 1300V.
- the ion implantation process becomes complicated and takes time, which in turn reduces the device manufacturing cost. Will be increased.
- the present disclosure has a structure in which an outer peripheral breakdown voltage structure surrounding the outer periphery of a transistor cell region where a JFET or the like is formed can be formed and a high drain breakdown voltage can be obtained without performing oblique ion implantation.
- An object of the present invention is to provide a SiC semiconductor device and a manufacturing method thereof.
- the outer peripheral withstand voltage structure provided in the outer peripheral withstand voltage structure region is formed so as to surround the outer periphery of the transistor cell region, and is deeper than the first conductivity type layer and the second conductivity type layer.
- a first recess reaching the drift layer a first trench formed so as to surround the outer periphery of the transistor cell region at the position of the inner peripheral side surface of the first recess, and embedded in the first trench, and an electric field relaxation structure including a second conductivity type buried layer constituting the side surface of the recess.
- the electric field relaxation structure in which the side surface of the first recess is configured by the second conductivity type buried layer, the electric field concentration at the corner portion that becomes the boundary between the side surface and the bottom surface is reduced, and the breakdown position is set. Since it is possible to shift to the drift layer at the bottom surface of the first recess, electric field relaxation can be performed. Therefore, the drain breakdown voltage can be improved. Since the second conductivity type buried layer having such a structure is formed by being buried in the first trench, it can be formed without performing oblique ion implantation. Thereby, it is possible to form an outer peripheral breakdown voltage structure surrounding the outer periphery of the transistor cell region without performing oblique ion implantation, and to obtain a high drain breakdown voltage.
- the second recess is formed so as to surround the outer periphery of the transistor cell region deeper than the thickness of the first conductivity type layer, and the first recess is more than the second recess. Is formed on the outer peripheral side of the transistor cell region, is formed deeper than the second recess, and the first trench is formed at a boundary position between the second recess and the first recess.
- the first recess may be formed on the outer peripheral side of the transistor cell region with respect to the second recess.
- the first recess side of the bottom surface of the second recess and the second recess side of the bottom surface of the first recess are connected to the second conductivity type buried layer.
- the second conductivity type layer is formed, and the electric field relaxation structure is constituted by the second conductivity type RESURF layer constituted by these connection structures.
- the second conductivity type layer on the first recess side of the bottom surface of the second recess and the second conductivity type layer on the second recess side of the bottom surface of the first recess become the second conductivity type buried layer. Since the second conductivity type RESURF layer is configured by being continuously connected, it is possible to secure an ideal drain breakdown voltage during OFF.
- a plurality of first trenches are formed on the outer peripheral side further from the boundary position between the second recess and the first recess, and the second conductivity type buried layer is formed in each first trench.
- the electric field relaxation structure is configured by a guard ring structure including a second conductive type buried layer provided in the plurality of first trenches.
- the guard ring structure is configured by the second conductivity type buried layers provided in the plurality of first trenches. Even when such a guard ring structure is provided, the second conductivity type buried layer can be arranged on the side surface of the first recess by using the first trench or the second conductivity type buried layer. . Even with such a structure, an effect similar to that of the third aspect can be obtained.
- the second conductivity type embedded layer is provided in each of the first trenches, and is formed inside the boundary position between the second recess and the first recess.
- the electric field relaxation structure is configured by a guard ring structure including a second conductivity type buried layer provided in the first trench.
- the guard ring structure can be formed inside the boundary position between the second recess and the first recess.
- the first trench and the first conductive type buried layer are also formed in the second recess.
- a guard ring structure using the buried layer and the second conductivity type buried layer is formed, and the second conductivity type layer is disposed between the first trenches.
- the second conductive type buried layer and the second conductive type layer function as a guard ring structure, and the distance between them is only the thickness of the first conductive type buried layer. Therefore, the electric field inside the guard ring structure is further reduced, and the drain breakdown voltage can be secured stably and easily.
- the first trench constituting the guard ring structure is characterized in that the width is narrowed toward the outer peripheral direction of the transistor cell region.
- the width of the first trench can be gradually narrowed toward the outer peripheral direction of the transistor cell region.
- the position of the bottom of the second conductivity type buried layer can be gradually reduced.
- the transistor cell region includes the first conductivity type layer and the second conductivity type layer in which the second conductivity type layer is the first gate region and the first conductivity type layer is the source region.
- a JFET that controls the current between the source and the drain is formed by controlling the potential of.
- the present disclosure can be applied to a SiC semiconductor device that configures a JFET in the transistor cell region.
- the second trench, the channel layer, and the second gate region are formed. Therefore, using these formation steps, the first trench formation step and the second conductivity type buried layer are formed. A formation process etc. can be performed. As a result, the manufacturing process can be shared, and the electric field relaxation structure can be realized without increasing the manufacturing process.
- the first trench and the second trench have the same depth, and the second conductivity type buried layer is interposed in the first trench via the first conductivity type buried layer. Will be formed.
- the transistor cell region has the second conductivity type layer as a base region, the first conductivity type layer as a source region, and a base region located between the source region and the drift layer.
- a MOSFET that controls the current between the source and the drain by controlling the potential of the gate electrode is formed.
- the present disclosure can be applied to an SiC semiconductor device that constitutes a MOSFET in the transistor cell region.
- the second trench can be formed and a deep layer can be embedded in the second trench. Therefore, the first trench forming step and the second trench can be formed using these forming steps.
- a conductive type buried layer forming step or the like can be performed. As a result, the manufacturing process can be shared, and the electric field relaxation structure can be realized without increasing the manufacturing process.
- the first trench and the second trench have the same depth.
- the MOSFET in the transistor cell region, a trench that penetrates through the first conductivity type layer and the second conductivity type layer to reach the drift layer is formed, and the gate insulating film and the gate are formed in the trench.
- the MOSFET has a trench gate structure, and the depth of the second trench is deeper than the trench in the trench gate structure.
- the MOSFET formed in the transistor cell region can be a MOSFET having a trench gate structure.
- the depth of the second trench in which the deep layer is embedded is deeper than the trench constituting the trench gate structure.
- the present disclosure in the second to eleventh aspects described above, the case where the present disclosure is grasped as an apparatus has been described, but the present disclosure can also be grasped as a manufacturing method.
- the twelfth to twenty-second aspects are disclosures corresponding to the manufacturing method of the SiC semiconductor device of the first to eleventh aspects.
- a step of preparing a semiconductor substrate a step of forming a first trench surrounding the outer periphery of the transistor cell region in the outer peripheral withstand voltage structure region, and a second conductivity embedded in the first trench Forming a buried type layer, and forming a first recess that reaches the drift layer deeper than the first conductivity type layer and the second conductivity type layer so as to surround the outer periphery of the transistor cell region,
- the first concave portion is located at a position that becomes the side surface on the inner peripheral side, and the side surface of the first concave portion is configured by the second conductivity type buried layer, It is characterized by constituting an electric field relaxation structure including a two-conductivity type buried layer.
- the step of forming the second recess so as to surround the outer periphery of the transistor cell region is deeper than the thickness of the first conductivity type layer
- the step of forming the first recess includes: The first trench is positioned at the boundary position between the second recess and the first recess, and the side surface of the first recess at the boundary position between the second recess and the first recess is configured by the second conductivity type buried layer.
- the electric field relaxation structure including the second conductivity type buried layer is formed.
- a mask is formed on the substrate surface, and the second conductive is performed from the normal direction of the substrate using the mask.
- the second conductivity is connected to the second conductivity type buried layer on the first recess side of the bottom surface of the second recess and on the second recess side of the bottom surface of the first recess by ion implantation of the type impurity.
- the electric field relaxation structure is formed by forming the mold layer and forming the second conductivity type RESURF layer by these connection structures.
- the second conductivity type layer can be formed by ion-implanting the second conductivity type impurity from the substrate normal direction. Thereby, the SiC semiconductor device of the 3rd mode can be manufactured.
- a plurality of first trenches are formed on the outer peripheral side from the boundary position between the second recess and the first recess, and the second conductivity type is formed.
- the second conductivity type buried layer is formed in each of the first trenches, thereby constituting the second conductivity type buried layer provided in the plurality of first trenches.
- An electric field relaxation structure is constituted by the guard ring structure to be formed. Thereby, the SiC semiconductor device of the 4th mode can be manufactured.
- the first trench in the step of forming the first trench, is also formed inside the boundary position between the second recess and the first recess, and the second trench is formed in each first trench.
- the electric field relaxation structure is configured by the guard ring structure formed by the second conductive type buried layer provided in the plurality of first trenches. It is characterized by that. Thereby, the SiC semiconductor device of the 5th mode can be manufactured.
- the step of forming the first trench is characterized in that the width of the plurality of trenches becomes narrower toward the outer peripheral direction of the transistor cell region.
- the step of forming the second trench that reaches the drift layer through the first conductivity type layer and the second conductivity type layer, and on the inner wall of the second trench Forming a first conductivity type channel layer by epitaxial growth, forming a second conductivity type second gate region on the channel layer, and a source electrode electrically connected to the first conductivity type layer And forming a drain electrode electrically connected to the first conductivity type substrate, the second conductivity type layer as the first gate region and the first conductivity type layer as the source region.
- a JFET that controls the current between the source and the drain is formed by controlling the potential of at least one of the first gate region and the second gate region.
- the step of forming the first conductivity type buried layer in the first trench and the second conductivity is performed after the formation of the first conductivity type buried layer in the first trench, the step of forming the first trench and the step of forming the second trench are performed simultaneously, and the first conductivity type is formed.
- a process of forming a buried layer and a step of forming a channel layer are performed at the same time, and a process of forming a second conductivity type buried layer and a process of forming a second gate region are performed simultaneously. Therefore, the electric field relaxation structure can be realized without increasing the number of manufacturing steps.
- a step of forming a second trench that reaches the drift layer through the first conductivity type layer and the second conductivity type layer, and embedded in the second trench Forming a deep layer of the second conductivity type, and the surface of the base region located between the source region and the drift layer with the second conductivity type layer as the base region and the first conductivity type layer as the source region
- Forming a gate insulating film on the surface forming a gate electrode on the surface of the gate insulating film, forming a source electrode electrically connected to the first conductive type layer, and forming a first conductive type substrate on the first conductive type substrate
- Forming a drain electrode that is electrically connected Forming a MOSFET that controls a source-drain current by controlling the potential of the gate electrode.
- the step of forming the first trench and the step of forming the second trench are performed simultaneously,
- the manufacturing process can be shared, and an electric field relaxation structure can be realized without an increase in the manufacturing process.
- the MOSFET formed in the transistor cell region is a MOSFET having a trench gate structure
- the first conductivity type layer and the second conductivity type layer are formed in the transistor cell region.
- the SiC semiconductor device of the eleventh aspect can be manufactured by increasing the depth of.
- the drawing (A) is a top surface layout view of the SiC semiconductor device including the JFET according to the first embodiment of the present disclosure
- (b) is a cross-sectional view taken along the line IB-IB in (a).
- 4 is a graph showing the results of examining the relationship between the impurity concentration of a P + -type layer 15 and the drain breakdown voltage.
- (A) (b) (c) is sectional drawing which showed the manufacturing process of the SiC semiconductor device shown to Fig.1 (a) (b).
- FIG. 6 is a cross-sectional view showing a manufacturing process of the SiC semiconductor device shown in FIG. 5. It is sectional drawing of the SiC semiconductor device provided with JFET concerning 3rd Embodiment of this indication.
- FIG. 8 is a cross-sectional view showing a manufacturing step of the SiC semiconductor device shown in FIG. 7. It is sectional drawing of the SiC semiconductor device provided with JFET concerning 4th Embodiment of this indication.
- FIG. 14 is a cross-sectional view showing a manufacturing step of the SiC semiconductor device shown in FIG. 13. It is sectional drawing of the SiC semiconductor device provided with MOSFET concerning 7th Embodiment of this indication.
- FIG. 16 is a cross-sectional view showing a manufacturing step of the SiC semiconductor device shown in FIG. 15. It is sectional drawing of the SiC semiconductor device provided with MOSFET concerning 8th Embodiment of this indication.
- (A) (b) is sectional drawing which showed the formation process of the P-type RESURF layer as an outer periphery pressure
- FIGS. 1A and 1B are views showing a SiC semiconductor device provided with a JFET according to the present embodiment.
- FIG. 1A is a top surface layout diagram
- FIG. 1B is an IB-IB of FIG. It is sectional drawing.
- the configuration of the SiC semiconductor device including the JFET according to this embodiment will be described below based on this figure.
- an embedded epitaxial region R3 in which an epitaxial layer is embedded in a trench to form a gate structure is laid out in a stripe shape in which a plurality of strips are arranged in a strip shape, and the outer peripheral breakdown voltage structure region R2 is provided.
- the SiC semiconductor device includes an N + type substrate (first conductivity type substrate) 1, an N ⁇ type drift layer 2, a P + type layer (second conductivity type layer) 3, and an N + type layer (first conductivity type) made of SiC.
- Layer) 4 is formed by using a semiconductor substrate 5 having a laminated structure.
- the N + type substrate 1 has an N type impurity concentration of 1 ⁇ 10 19 cm ⁇ 3 or more.
- the N ⁇ -type drift layer 2 is, for example, 1 ⁇ 10 15 to 5 ⁇ 10 16 cm ⁇ 3 in which the N-type impurity concentration is lower than that of the N + -type substrate 1, and the P + -type layer 3 has, for example, a P-type impurity concentration.
- the N + -type layer 4 has an N-type impurity concentration higher than that of the N ⁇ -type drift layer 2, for example, 1 ⁇ 10 18 to 5 ⁇ 10 20 cm ⁇ 3 . Has been.
- a transistor cell region R1 provided with a large number of JFETs is formed on the inner side of the semiconductor substrate 5, and an outer peripheral breakdown voltage structure region R2 is formed so as to surround the transistor cell region R1, whereby SiC A semiconductor device is configured.
- a trench (second trench) 6 that penetrates through the N + type layer 4 and the P + type layer 3 to reach the N ⁇ type drift layer 2 is formed.
- the trench 6 is formed in a state where a plurality of trenches 6 are arranged at a predetermined interval with one direction as a longitudinal direction.
- an N ⁇ type channel layer (fourth semiconductor layer) having a thickness of 1 ⁇ m or less and an N type impurity concentration of 5 ⁇ 10 15 to 1 ⁇ 10 17 cm ⁇ 3.
- a P + type layer (fifth semiconductor layer) 8 having a P type impurity concentration of 1 ⁇ 10 18 to 5 ⁇ 10 20 cm ⁇ 3 are epitaxially grown in this order.
- the trench 6 is buried by these N ⁇ type channel layer 7 and P + type layer 8, thereby forming a buried epi region R 3.
- the first gate region is formed by the P + type layer 3
- the second gate region is formed by the P + type layer 8
- the N + type layer 4 is used.
- An N + type source region is formed.
- the first gate electrode is electrically connected to the P + -type layer 3 forming the first gate region, and the gate voltage of the first gate region is controlled through the first gate electrode.
- a second gate electrode 9 is electrically connected to the P + -type layer 8 constituting the second gate region, and the gate voltage of the second gate region is controlled through the second gate electrode 9.
- the first gate electrode is formed on the surface of the P + -type layer 3 constituting the first gate region, but is formed at a position different from that in FIG. 1B, via the contact hole. In contact with the P + -type layer 3.
- the second gate electrode 9 is formed on each surface of the P + type layer 8 constituting the second gate region.
- the first gate electrode and the second gate electrode 9 are made of, for example, Ni which is a material capable of making ohmic contact with a P + type semiconductor, and an alloy film of Ti and Al laminated thereon.
- a source electrode 10 made of, for example, Ni is formed on the surface of the N + type layer 4 constituting the N + type source region.
- the source electrode 10 is configured to be electrically separated from the first gate electrode and the second gate electrode 9 through the interlayer insulating film 11.
- a drain electrode 12 electrically connected to the N + type substrate 1 is formed on the back surface side of the semiconductor substrate 5, and a transistor cell region R1 made up of a plurality of JFETs is configured by such a configuration.
- trench (first trench) 13 that penetrates N + type layer 4 and P + type layer 3 and reaches N ⁇ type drift layer 2 is also formed on the main surface side of semiconductor substrate 5 in peripheral breakdown voltage structure region R 2.
- the trench 13 is formed so as to surround the outer periphery of the transistor cell region R1.
- an N ⁇ type layer (first conductivity type buried layer) 14 formed simultaneously with the N ⁇ type channel layer 7 and a P + type layer (first layer formed simultaneously with the P + type layer 8). 2 conductivity type buried layer) 15 is provided.
- the mesa structure is formed by forming a recess 17 corresponding to the first recess having a depth that reaches the N ⁇ type drift layer 2 through the 4 and P + type layers 3. That is, a recess 17 is formed so as to surround the transistor cell region R1, and a mesa structure in which the recess 16 is formed so as to surround the transistor cell region R1 on the inner peripheral side thereof is configured.
- P type P-type regions 18 and 19 having an impurity concentration of 1 ⁇ 10 18 to 5 ⁇ 10 20 cm ⁇ 3 are formed.
- the position of the boundary between the bottom surface and the side surface of the recess 17 (stepped portion) is aligned with the position of the trench 13 described above, and the side surface of the recess 17 is formed by the P + -type layer 15 disposed in the trench 13. It has a structured structure.
- the P-type region 18 formed on the bottom surface of the recess 16 is connected to the P + -type layer 15 disposed in the trench 13 and the P-type region 19 formed on the bottom surface of the recess 17. These constitute the P-type RESURF layer 20.
- the P-type RESURF layer 20 forms an electric field relaxation structure.
- N + -type layer 21 is formed in the surface layer portion of the N ⁇ -type drift layer 2 on the outer peripheral pressure-resistant structure region R2 on the outer peripheral side of the bottom surface of the recess 17 further than the P-type RESURF layer 20. And, this is the N + -type layer 21 and electrode 22 are connected, these N + -type layer 21 and the electrode 22, the field cutting channel stopper (EQR) is configured.
- the SiC semiconductor device including the JFET according to the present embodiment is configured by the above structure.
- the JFET formed in the transistor cell region R1 operates normally off. This operation is controlled by the voltage applied to the first gate electrode and the second gate electrode 9 and is performed as follows.
- first gate electrode and the second gate electrode 9 are electrically connected and these potentials can be controlled to the same potential, or they are not electrically connected to each other, and each potential is independently
- double gate driving is performed. That is, the extension amount of the depletion layer extending from the P + type layers 3 and 8 serving as the first and second gate regions to the N ⁇ type channel layer 7 side based on the potentials of the first gate electrode and the second gate electrode 9. Be controlled. For example, when no voltage is applied to the first gate electrode or the second gate electrode 9, the N ⁇ type channel layer 7 is pinched off by a depletion layer extending from the P + type layers 3 and 8. Thereby, the source-drain current is turned off.
- the P-type region 18 formed on the bottom surface of the recess 16, the P + -type layer 15 disposed in the trench 13, and the recess A P-type RESURF layer 20 is constituted by the P-type region 19 formed on the bottom surface of 17. Since this P-type RESURF layer 20 is configured to surround the periphery of the transistor cell region R1, electric field concentration at the corner portion that becomes the boundary between the side surface and the bottom surface is alleviated, and the breakdown position is set at the bottom surface of the recess 17. Since it is possible to shift to the N ⁇ type drift layer 2, electric field relaxation can be performed. Therefore, the drain breakdown voltage can be improved.
- FIG. 2 is a graph showing the results of examining the relationship between the impurity concentration of the P + -type layer 15 and the drain breakdown voltage when the P + -type layer 15 is disposed at the boundary position (step portion) between the bottom surface and the side surface of the recess 17. It is.
- the drain breakdown voltage when the P + -type layer 15 is not disposed at the boundary position between the bottom surface and the side surface of the recess 17 is also shown in the drawing.
- the drain breakdown voltage is greatly reduced as compared with the case where the P + -type layer 15 is not arranged. It turns out that it improves.
- the P-type impurity concentration is 3.0 ⁇ 10 17 cm ⁇ 3 or more, a high drain withstand voltage exceeding 1100 V can be obtained. Therefore, a high drain breakdown voltage is obtained by setting the P-type impurity concentration of the P + -type layer 15 to 3.0 ⁇ 10 17 cm ⁇ 3 or more.
- 1 ⁇ 10 18 to 5 ⁇ 10 By setting to 20 cm ⁇ 3 (for example, 5 ⁇ 10 18 cm ⁇ 3 ), a higher drain breakdown voltage can be obtained more reliably.
- FIGS. 3A, 3B, and 4C the manufacturing process diagrams shown in FIGS. 3A, 3B, and 4C are shown. It explains using.
- FIGS. 4A, 4B, and 4C are omitted on the outer peripheral side of the P-type RESURF layer 20 in the cross section shown in FIG. It is.
- Step shown in FIG. 3 (a) First, an N + type substrate 1 having the above impurity concentration is prepared, and an N ⁇ type drift layer 2, a P + type layer 3 and an N + type layer 4 are epitaxially grown on the surface of the N + type substrate 1 in this order. Then, the semiconductor substrate 5 is formed.
- a trench 6 that penetrates the N + -type layer 4 and the P + -type layer 3 and reaches the N ⁇ -type drift layer 2 is formed in the transistor cell region R1, and at the same time, in the outer peripheral breakdown voltage structure region R2, N + A trench 13 that penetrates through the mold layer 4 and the P + -type layer 3 to reach the N ⁇ -type drift layer 2 is formed.
- the trenches 6 and 13 are formed with the same width and the same depth.
- N ⁇ -type SiC and P + -type SiC are epitaxially grown on the entire surface of the semiconductor substrate 5 to form an N ⁇ -type layer 30 and a P + -type layer 31, thereby filling the trenches 6 and 13. .
- Step shown in FIG. 4 (a) By flattening the surface of the semiconductor substrate 5 by etch back, CMP (Chemical Mechanical Polishing), etc., the N ⁇ type layer 30 and the P + type layer 31 are left only in the trenches 6 and 13. As a result, an N ⁇ type channel layer 7 and a P + type layer 8 are formed in the trench 6, and an N ⁇ type layer 14 and a P + type layer 15 are formed in the trench 13.
- CMP Chemical Mechanical Polishing
- the recess 16 is formed by etching to a position deeper than the N + type layer 4 at the outer edge of the transistor cell region R1.
- the concave portion 16 is formed by performing anisotropic etching after arranging a mask in which a region where the concave portion 16 is to be formed (peripheral pressure-resistant structure region R2) is opened. Subsequently, using a mask different from the mask used previously, anisotropic etching such as RIE is performed again to selectively etch the outer edge portion of the bottom surface of the concave portion 16 to a position deeper than the P + type layer 3. Form.
- anisotropic etching such as RIE (Reactive Ion Etching)
- the side surface of the recess 17 is constituted by the P + type layer 15 disposed in the trench 13.
- Step shown in FIG. 4 (c)] After disposing the mask 32 for ion implantation, openings are formed in regions where the P-type regions 18 and 19 are to be formed. Thereafter, P-type regions 18 and 19 are formed by ion-implanting P-type impurities from a direction perpendicular to the substrate surface. At this time, in the step shown in FIG. 4B, the side surface of the concave portion 17 is configured by the P + type layer 15 arranged in the trench 13, so that the P formed on the bottom surface of the concave portion 16 is formed. The mold region 18 is connected to the P + -type layer 15 disposed in the trench 13 and the P-type region 19 formed on the bottom surface of the concave portion 17, thereby forming the P-type RESURF layer 20.
- a residue of the mask 32 may remain on the side surface of the recess 17, and the ion implantation is blocked by this residue, and the end position of the P-type region 19 is slightly changed.
- the corner portion of the recess 17 may be separated.
- the P + -type layer 15 disposed in the trench 13 is also present on the bottom surface of the recess 17, the P + -type layer 15 and the P-type region 19 can be formed without interruption.
- N-type impurities are ion-implanted using a metal mask or the like, and the implanted impurities are activated to form the N + -type layer 21.
- contact holes are formed in predetermined regions of the interlayer insulating film 11 and the N + type layer 4, and a wiring layer is formed on the interlayer insulating film 11.
- the first gate electrode, the second gate electrode 9, the source electrode 10, and the electrode 22 are formed by forming a film and patterning the wiring layer.
- the SiC semiconductor device shown in FIGS. 1A and 1B is completed.
- an electric field relaxation structure is formed. Since the P-type RESURF layer 20 is configured to surround the periphery of the transistor cell region R1, the electric field concentration at the corner portion that becomes the boundary between the side surface and the bottom surface is alleviated, and the breakdown position is set to the bottom surface of the recess 17. in N - since it shifts the type drift layer 2, it is possible to perform the electric field relaxation. Therefore, the drain breakdown voltage can be improved.
- the P-type RESURF layer 20 in which the P-type region 18, the P + -type layer 15, and the P-type region 19 are continuously connected constitutes an ideal drain breakdown voltage at OFF. Can be secured.
- the P-type RESURF layer 20 configured in this way, ions need not be implanted into the side surfaces of the recesses 17 during ion implantation, and only the P-type regions 18 and 19 on the bottom surfaces of the recesses 16 and the recesses 17 are formed. good. For this reason, the P-type RESURF layer 20 can be formed without performing oblique ion implantation. Therefore, an SiC semiconductor device having a structure capable of forming an outer peripheral breakdown voltage structure surrounding the outer periphery of the transistor cell region R1 in which a JFET or the like is formed without obtaining oblique ion implantation, and capable of obtaining a high drain breakdown voltage. Is possible.
- the trench 13, the N ⁇ -type layer 14 and the P + -type layer 15 for realizing such a structure are simultaneously formed with the trench 6, the N ⁇ -type layer 7 and the P + -type layer 8 for configuring the JFET. Since it can be formed, the manufacturing process can be shared, and the above structure can be realized without increasing the manufacturing process.
- FIG. 5 is a cross-sectional view of the SiC semiconductor device including the JFET according to the present embodiment.
- a plurality of trenches 13 are formed, and each trench 13 is filled with an N ⁇ type layer 14 and a P + type layer 15.
- the position of the boundary position (stepped portion) between the bottom surface and the side surface of the trench 13 and the concave portion 17 on the innermost peripheral side, that is, the transistor cell region R1 side is made to coincide, and the P + type disposed in the trench 13
- the layer 15 has a structure in which the side surface of the recess 17 is formed.
- the P + -type layer 15 in each trench 13 formed on the outer peripheral side becomes a structure in which the upper portion is removed by the concave portion 17, but remains as a structure arranged at equal intervals, thereby guarding A ring structure is constructed.
- the outer peripheral pressure resistant structure region R2 is provided with a guard ring structure instead of the P-type RESURF layer 20 described in the first embodiment. Even when such a guard ring structure is provided, the P + -type layer 15 can be arranged on the side surface of the recess 17 using the trench 13, the N ⁇ -type layer 14 and the P + -type layer 15. . Even if it is such a structure, the effect similar to 1st Embodiment can be acquired.
- the manufacturing process of the SiC semiconductor device of this embodiment is substantially the same as that of the first embodiment. However, as shown in FIG. 6, the trench 13 is formed in the process of FIG. 3B described in the first embodiment. The difference is that a plurality are formed at equal intervals. If a plurality of trenches 13 are formed at equal intervals in this way, the inside of each trench 13 is filled with an N ⁇ type layer 14 and a P + type layer 15.
- the SiC semiconductor device according to the embodiment can be manufactured.
- the SiC semiconductor device has a guard ring structure in place of the P-type RESURF layer 20 in the outer peripheral breakdown voltage structure region R2, the guard ring structure can be formed without performing the ion implantation process.
- FIG. 7 is a cross-sectional view of the SiC semiconductor device including the JFET according to the present embodiment.
- the guard ring structure is configured by using the trench 13, the N ⁇ -type layer 14 and the P + -type layer 15, but as the width of the trench 13 moves toward the outer peripheral side. Gradually narrowing. As the width of the trench 13 becomes narrower, the thickness of the N ⁇ -type layer 14 becomes thicker, and the position of the bottom of the P + -type layer 15 formed on the N ⁇ -type layer 14 becomes gradually shallower. .
- the manufacturing process of the SiC semiconductor device of this embodiment is substantially the same as that of the second embodiment, but as shown in FIG. 8, the trench 13 is formed in the process of FIG. 3B described in the first embodiment.
- the difference is that the width is gradually narrowed toward the outer peripheral side.
- the film thickness of the N ⁇ -type layer 14 formed at the bottom of the trench 13 changes according to the width of the trench 13.
- the film thickness of the N ⁇ -type layer 14 increases as the width of the trench 13 decreases. For this reason, the position of the bottom of the P + type layer 15 formed on the N ⁇ type layer 14 can be gradually made shallower. In this way, the SiC semiconductor device according to the present embodiment can be manufactured.
- FIG. 9 is a cross-sectional view of a SiC semiconductor device including the JFET according to the present embodiment.
- the one arranged on the innermost side is the position of the boundary position (stepped portion) between the bottom surface and the side surface of the concave portion 17.
- the several trenches 13 counted from the innermost one of the plurality of trenches 13 are made to coincide with the position of the boundary position (step portion) between the bottom surface and the side surface of the recess 17.
- the trench 13 may be further provided inside the trench 13 that coincides with the boundary position between the bottom surface and the side surface of the recess 17.
- an N ⁇ type located between P-type regions (P + -type layers 15 arranged in the trenches 13 in the second and third embodiments and the present embodiment) arranged in a plurality of rings.
- the layer 14 and the N ⁇ type drift layer 2 function as an electric field relaxation layer.
- the innermost peripheral one is the position of the boundary position (stepped portion) between the bottom surface and the side surface of the concave portion 17
- the interval between the guard rings is a length obtained by adding the film thickness of the N ⁇ type layer 14 in both adjacent trenches 13 and the width of the N ⁇ type drift layer 2 existing between them.
- a guard ring structure using the trench 13, the N ⁇ -type layer 14 and the P + -type layer 15 is also formed in the recess 16.
- the P + -type layer 3 is placed. Therefore, the P + -type layer 15 and the P + -type layer 3 function as a guard ring structure, and the distance between them is only the film thickness of the N ⁇ -type layer 14. Therefore, the electric field inside the guard ring structure is further reduced, and the drain breakdown voltage can be secured stably and easily.
- FIG. 9 illustrates the case where the width of the trench 13 is made equal as in the second embodiment, the width of the trench 14 gradually becomes narrower toward the outer peripheral side as in the third embodiment. The same can be said for these cases.
- FIG. 10 is a cross-sectional view of the SiC semiconductor device according to the present embodiment.
- the present embodiment has a structure including a MOSFET having a trench gate structure.
- the SiC semiconductor device of this embodiment also includes an N + type substrate (first conductivity type substrate) 1, an N ⁇ type drift layer (first conductivity type layer) 2, and a P + type layer (first type) made of SiC. 2 conductivity type layer) 3 and N + type layer 4 are formed using semiconductor substrate 5, and P + type layer 3 functions as a P type base region for forming a channel region. .
- the trench 6 includes a gate insulating film 40 and a gate electrode 41 formed on the surface of the gate insulating film 40 in place of the N ⁇ type channel layer 7 and the P + type layer 8 described in the first embodiment.
- the trench 6 is filled with the gate insulating film 40 and the gate electrode 41.
- a trench deeper than the trench 6 that reaches the N ⁇ type drift layer 2 through the N + type layer 4 and the P + type layer 3 at a predetermined distance from the side surface of the trench 6 ( A second trench) 42 is formed, and the inside of the trench 42 is filled with a P + type deep layer 43. Since the trench 42 is made deeper than the trench 6 in this way, the electric field applied to the gate insulating film 40 at the time of off is relaxed, and the gate insulating film can be prevented from being broken.
- the trench 42 may be entirely filled with the P + type deep layer 43, but a low concentration layer 44 composed of P ⁇ type or N ⁇ type is formed at the bottom of the trench 42, and this low concentration layer 44 As a result, the corner portion at the bottom of the P + type deep layer 43 is rounded to suppress electric field concentration.
- An interlayer insulating film 11 is formed so as to cover the gate electrode 41, a source electrode 10 is formed on the interlayer insulating film 11, and a source region is formed via a contact hole formed in the interlayer insulating film 11.
- a MOSFET having a trench gate structure is configured.
- a trench (first trench) 45 that penetrates N + type layer 4 and P + type layer 3 and reaches N ⁇ type drift layer 2 is also formed on the main surface side of semiconductor substrate 5 in peripheral breakdown voltage structure region R 2.
- the trench 45 is formed so as to surround the outer periphery of the transistor cell region R1.
- a P + type layer (second conductivity type buried layer) 46 formed simultaneously with the P + type deep layer 43 and the low concentration layer 44 and a low concentration layer (first conductivity type or second conductivity type). Mold embedding layer) 47 is provided.
- the position of the boundary between the bottom surface and the side surface of the concave portion 17 (stepped portion) and the position of the trench 45 described above are made coincident with each other, and the side surface of the concave portion 17 is formed by the P + -type layer 46 disposed in the trench 45.
- It has a structured structure. With such a structure, the P-type region 18 formed on the bottom surface of the recess 16 is connected to the P + -type layer 46 disposed in the trench 45 and the P-type region 19 formed on the bottom surface of the recess 17.
- the P-type RESURF layer 20 is constituted.
- the side surface of the concave portion 17 is configured by the P + -type layer 46 disposed in the trench 45, so that the same as in the first embodiment. The effect of can be obtained.
- FIGS. 11A, 11B, and 12C are omitted on the outer peripheral side of the P-type RESURF layer 20 in the cross section shown in FIG. .
- Step shown in FIG. 11A First, an N + type substrate 1 having the above impurity concentration is prepared, and an N ⁇ type drift layer 2, a P + type layer 3 and an N + type layer 4 are epitaxially grown on the surface of the N + type substrate 1 in this order. Then, the semiconductor substrate 5 is formed.
- a trench 42 that penetrates the N + -type layer 4 and the P + -type layer 3 to reach the N ⁇ -type drift layer 2 is formed in the transistor cell region R1, and at the same time, in the outer peripheral breakdown voltage structure region R2, N + A trench 45 that penetrates the mold layer 4 and the P + -type layer 3 and reaches the N ⁇ -type drift layer 2 is formed.
- the trenches 42 and 45 are formed with the same width and the same depth.
- Step shown in FIG. 11C By epitaxial growth, P - -type SiC or N - type SiC and by epitaxially growing sequentially the P + -type SiC on the entire surface of the semiconductor substrate 5, the low-concentration layer 44, 47 and the P + -type deep layer 43 and P + -type layer 46 are formed to fill the trenches 42 and 45.
- Step shown in FIG. 12 (a) The surface of the semiconductor substrate 5 is planarized by etch back or CMP (Chemical Mechanical Polishing). As a result, the low concentration layers 44 and 47, the P + type deep layer 43 and the P + type layer 46 are left only in the trenches 42 and 45.
- CMP Chemical Mechanical Polishing
- the recessed part 16 and the recessed part 17 are formed by performing the process similar to FIG.4 (b) demonstrated in 1st Embodiment. Thereby, a mesa structure is configured. At this time, the side surface of the recess 17 is constituted by the P + type layer 46 disposed in the trench 45.
- Step shown in FIG. 12 (c) After a trench etching mask (not shown) is arranged on the entire surface of the semiconductor substrate 5, the trench 6 is formed by performing trench etching. Then, after forming the gate insulating film 40 by thermal oxidation or the like, the gate electrode 41 is formed in the trench 6 by depositing doped Poly-Si or the like. Then, planarization is performed so that the gate electrode 41 remains in the trench 6 by etch back or the like.
- an ion implantation mask having openings formed in the regions where the P-type regions 18 and 19 are to be formed is arranged as in FIG. 4C described in the first embodiment.
- P-type regions 18 and 19 are formed by ion-implanting P-type impurities from a direction perpendicular to the substrate surface.
- the side surface of the recess 17 is constituted by the P + type layer 46 disposed in the trench 45, so that the P formed on the bottom surface of the recess 16 is formed.
- the mold region 18 is connected to the P + -type layer 46 disposed in the trench 13 and the P-type region 19 formed on the bottom surface of the concave portion 17, thereby forming the P-type RESURF layer 20. Then, after removing the mask, N-type impurities are ion-implanted using a metal mask or the like, and the implanted impurities are activated to form the N + -type layer 21. Thereafter, after forming the interlayer insulating film 11, a contact hole is formed in a predetermined region of the interlayer insulating film 11 or the N + type layer 4, and a wiring layer is formed on the interlayer insulating film 11 and the wiring layer is patterned. As a result, the source electrode 10 and the electrode 22 are formed. And the drain electrode 12 is formed in the back surface side of the semiconductor substrate 5, and the SiC semiconductor device shown in FIG. 10 is completed.
- the P-type region 18 formed on the bottom surface of the recess 16 and the P disposed in the trench 45 are used.
- the + -type layer 46 and the P-type region 19 formed on the bottom surface of the recess 17 constitute a P-type RESURF layer 20. Even with such a structure, the drain breakdown voltage can be improved as in the first embodiment.
- the P-type RESURF layer 20 configured as described above does not have to be implanted into the side surface of the recess 17 at the time of ion implantation. Therefore, a transistor cell in which a MOSFET or the like is formed without performing oblique ion implantation. It is possible to form an SiC semiconductor device having a structure in which an outer peripheral breakdown voltage structure surrounding the outer periphery of the region R1 can be formed and a high drain breakdown voltage can be obtained.
- the trench 45 and the P + type layer 46 for realizing such a structure can be formed at the same time as the trench 42 and the P + type deep layer 43 for configuring the MOSFET, so that the manufacturing process is not increased. The above structure can be realized.
- FIG. 13 is a cross-sectional view of the SiC semiconductor device including the MOSFET according to the present embodiment.
- a plurality of trenches 45 are formed, and each trench 45 is filled with a low concentration layer 47 and a P + type layer 46.
- the innermost, i.e. the boundary position between the bottom and sides of the transistor cell region R1 side of the trench 45 and the recess 17 and the position (the stepped portion) is made to coincide, P + -type disposed in the trench 45
- the layer 46 has a structure in which the side surface of the recess 17 is formed.
- the outer peripheral breakdown voltage structure region R2 is provided with a guard ring structure instead of the P-type RESURF layer 20 described in the fifth embodiment. Even when such a guard ring structure is provided, the trench 45 and the P + type layer 46 can be used to arrange the P + type layer 46 on the side surface of the recess 17. Even if it is such a structure, the effect similar to 5th Embodiment can be acquired.
- the manufacturing process of the SiC semiconductor device of this embodiment is almost the same as that of the fifth embodiment.
- the trench 45 is formed in the process of FIG. 11B described in the fifth embodiment.
- the difference is that a plurality are formed at equal intervals. If a plurality of trenches 45 are formed at equal intervals in this manner, the trenches 45 are filled with the low concentration layer 47 and the P + type layer 46 when the low concentration layer 44 and the P + type deep layer 43 are formed. It is.
- the SiC semiconductor device according to the embodiment can be manufactured.
- the SiC semiconductor device has a guard ring structure in place of the P-type RESURF layer 20 in the outer peripheral breakdown voltage structure region R2, the guard ring structure can be formed without performing the ion implantation process.
- FIG. 15 is a cross-sectional view of an SiC semiconductor device including the MOSFET according to the present embodiment.
- the inside of the trench 45 forms a guard ring structure using the low-concentration layer 47 and the P + -type layer 46.
- the width of the trench 45 moves toward the outer peripheral side. Gradually narrowing.
- the film thickness of the low concentration layer 47 is increased as the width of the trench 45 becomes narrower, and the position of the bottom of the P + type layer 46 formed on the low concentration layer 47 is gradually shallower.
- the electric field can be relaxed by turning off, and the area of the outer peripheral breakdown voltage structure region R2 is small compared to the sixth embodiment in which the position of the bottom of the P + -type layer 46 is equal.
- an equivalent or large drain breakdown voltage can be secured.
- the manufacturing process of the SiC semiconductor device of this embodiment is substantially the same as that of the sixth embodiment.
- the trench 45 is formed.
- the difference is that the width is gradually narrowed toward the outer peripheral side.
- the film thickness of the low concentration layer 47 formed at the bottom of the trench 45 changes according to the width of the trench 45, As the width of the trench 45 becomes narrower, the film thickness of the low concentration layer 47 becomes thicker. Therefore, the position of the bottom of the P + type layer 46 formed on the low concentration layer 47 can be gradually made shallower. In this way, the SiC semiconductor device according to the present embodiment can be manufactured.
- FIG. 17 is a cross-sectional view of the SiC semiconductor device including the MOSFET according to the present embodiment.
- the heights of the bottom surfaces of the recesses 17 formed in the outer peripheral breakdown voltage structure region R2 are the same, so that the heights of the P + -type layers 46 constituting the plurality of guard rings are equal. It has become.
- the height of the bottom surface of the recess 17 is gradually lowered toward the outside of the transistor cell region R1, and each P + type layer constituting a plurality of guard rings is formed.
- the height of 46 may be gradually lowered.
- each P + -type layer 46 constituting the plurality of guard rings it becomes possible to more effectively relax the electric field and further improve the drain breakdown voltage. It becomes possible.
- the side surface of the concave portion 17 at the boundary position between the concave portion 16 and the concave portion 17 is configured by the P + type layers 15 and 46, and the P type RESURF layer 20 and the guard ring structure are configured using this.
- a peripheral pressure-resistant structure may be a structure including an electric field relaxation structure in which the side surface of the concave portion 17 at least at the boundary position between the concave portion 16 and the concave portion 17 is configured by the P + -type layers 15 and 46.
- Any structure such as a P-type RESURF layer 20, a guard ring structure, or a combination thereof may be used as the outer peripheral pressure resistance structure.
- the N channel type JFET in which the channel region is set in the N ⁇ type channel layer 7 and the N channel type MOSFET in which the channel region is set in the P + type layer 3 constituting the P type base region are provided.
- the present disclosure can also be applied to a P-channel type JFET or MOSFET in which the conductivity type of each component is reversed.
- JFET and MOSFET were mentioned as an example as a transistor formed in transistor cell area
- the JFET is a double gate drive that controls the current between the source and the drain by controlling both the potentials of the first and second gate regions.
- a single gate drive in which the current between the source and the drain is controlled by controlling only one of the potentials.
- the N + type layer 4 constituting the source region is epitaxially grown.
- the N + type layer 4 is formed by ion implantation of N type impurities into the first gate region 3. It may be formed.
- the recess 16 does not need to be formed. Therefore, the mesa structure may be configured only by the recess 17.
- the trench 13 corresponding to the first trench and the trench 6 corresponding to the second trench can be simultaneously formed.
- An electric field relaxation structure such as a P-type RESURF layer 20 or a guard ring structure is formed using a structure in which the N ⁇ -type layer 14 and the P + -type layer 15 are provided in the trench 13.
- the trench An electric field relaxation structure such as a P-type RESURF layer 20 or a guard ring structure is formed using a structure in which a P + -type layer 42 is provided in the structure 42.
- the structure in which the P + -type layer 42 is provided in the trench 42 as described in the fifth to eighth embodiments, or the MOSFET is provided in the trench 13 in the SiC semiconductor device.
- An electric field relaxation structure such as a P-type RESURF layer 20 or a guard ring structure may be configured using a structure including the N ⁇ -type layer 14 and the P + -type layer 15.
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Abstract
Description
本開示の一実施形態を適用したSiC半導体装置として、JFETを備えたSiC半導体装置を例に挙げて説明する。図1(a)(b)は、本実施形態にかかるJFETを備えたSiC半導体装置を示した図であり、図1(a)が上面レイアウト図、(b)が(a)のIB-IB断面図である。以下、この図に基づいて本実施形態にかかるJFETを備えたSiC半導体装置の構成について説明する。
まず、上記不純物濃度で構成されたN+型基板1を用意し、N+型基板1の表面に、N-型ドリフト層2、P+型層3およびN+型層4を順にエピタキシャル成長させることで半導体基板5を形成する。
フォトリソグラフィにより、トランジスタセル領域R1において、N+型層4およびP+型層3を貫通してN-型ドリフト層2に達するトレンチ6を形成すると同時に、外周耐圧構造領域R2においても、N+型層4およびP+型層3を貫通してN-型ドリフト層2に達するトレンチ13を形成する。本実施形態では、トレンチ6、13を同じ幅、同じ深さで形成している。
エピタキシャル成長法により、N-型SiCとP+型SiCを半導体基板5の表面全面にエピタキシャル成長させることにより、N-型層30およびP+型層31を形成し、これらによってトレンチ6、13内を埋め込む。
エッチバックやCMP(Chemical Mechanical Polishing)などによって半導体基板5の表面を平坦化することで、トレンチ6、13の内部にのみN-型層30およびP+型層31を残す。これにより、トレンチ6内にN-型チャネル層7およびP+型層8が形成されると共に、トレンチ13内にN-型層14およびP+型層15が形成される。
RIE(Reactive Ion Etching)等の異方性エッチングにより、トランジスタセル領域R1の外縁部において、N+型層4よりも深い位置までエッチングして凹部16を形成する。具体的には、凹部16の形成予定領域(外周耐圧構造領域R2)が開口するマスクを配置した後、異方性エッチングを行うことで凹部16を形成する。続いて、先ほど使用したマスクとは異なるマスクを用いて、再びRIE等の異方性エッチングにより、凹部16の底面における外縁部において、P+型層3よりも深い位置まで選択エッチングして凹部17を形成する。具体的には、凹部17の形成予定領域(セル領域の外縁部のうちP型リサーフ層15が配置される部分から外周側)が開口するマスクを配置した後、異方性エッチングを行うことで凹部17を形成する。このようにして、メサ構造が構成される。このとき、トレンチ13内に配置されたP+型層15によって凹部17の側面が構成されるようにしている。
イオン注入用のマスク32を配置したのち、P型領域18、19の形成予定領域に開口部を形成する。その後、基板表面に対する方線方向からP型不純物をイオン注入することで、P型領域18、19を形成する。このとき、図4(b)に示す工程において、トレンチ13内に配置されたP+型層15によって凹部17の側面が構成される様にしていることから、凹部16の底面に形成されたP型領域18と、トレンチ13内に配置されたP+型層15、および、凹部17の底面に形成されたP型領域19とが繋がり、これらによってP型リサーフ層20が構成される。
本開示の第2実施形態について説明する。本実施形態は、第1実施形態に対して外周耐圧構造領域R2の構造を変更したものであり、その他に関しては第1実施形態と同様であるため、異なる部分についてのみ説明する。
本開示の第3実施形態について説明する。本実施形態は、第2実施形態に対してガードリング構造の形状を変更したものであり、その他に関しては第2実施形態と同様であるため、異なる部分についてのみ説明する。
本開示の第4実施形態について説明する。本実施形態は、第2、第3実施形態に対してガードリング構造の形状を変更したものであり、その他に関しては第2、第3実施形態と同様であるため、異なる部分についてのみ説明する。
本開示の第5実施形態について説明する。本実施形態は、第1実施形態に対して、トランジスタセル領域R1に形成するトランジスタを変更したものであり、その他に関しては第1実施形態と同様であるため、異なる部分についてのみ説明する。
まず、上記不純物濃度で構成されたN+型基板1を用意し、N+型基板1の表面に、N-型ドリフト層2、P+型層3およびN+型層4を順にエピタキシャル成長させることで半導体基板5を形成する。
フォトリソグラフィにより、トランジスタセル領域R1において、N+型層4およびP+型層3を貫通してN-型ドリフト層2に達するトレンチ42を形成すると同時に、外周耐圧構造領域R2においても、N+型層4およびP+型層3を貫通してN-型ドリフト層2に達するトレンチ45を形成する。本実施形態では、トレンチ42、45を同じ幅、同じ深さで形成している。
エピタキシャル成長法により、P-型SiCもしくはN-型SiCとP+型SiCを半導体基板5の表面全面に順にエピタキシャル成長させることにより、低濃度層44、47およびP+型ディープ層43やP+型層46を形成し、これらによってトレンチ42、45内を埋め込む。
エッチバックやCMP(Chemical Mechanical Polishing)などによって半導体基板5の表面を平坦化する。これにより、トレンチ42、45の内部にのみ低濃度層44、47およびP+型ディープ層43やP+型層46が残された状態となる。
第1実施形態で説明した図4(b)と同様の工程を行うことで、凹部16および凹部17を形成する。これにより、メサ構造が構成される。このとき、トレンチ45内に配置されたP+型層46によって凹部17の側面が構成されるようにしている。
半導体基板5の表面全面にトレンチエッチング用マスク(図示せず)を配置した後、トレンチエッチングを行うことでトレンチ6を形成する。そして、熱酸化などによってゲート絶縁膜40を形成したのち、ドープトPoly-Si等を成膜することでトレンチ6内にゲート電極41を形成する。そして、エッチバックなどによってゲート電極41がトレンチ6内に残るように平坦化する。
本開示の第6実施形態について説明する。本実施形態は、第5実施形態に対して外周耐圧構造領域R2の構造を変更したものであり、その他に関しては第5実施形態と同様であるため、異なる部分についてのみ説明する。
本開示の第7実施形態について説明する。本実施形態は、第6実施形態に対してガードリング構造の形状を変更したものであり、その他に関しては第6実施形態と同様であるため、異なる部分についてのみ説明する。
本開示の第8実施形態について説明する。本実施形態は、第6、第7実施形態に対してガードリング構造の形状を変更したものであり、その他に関しては第6、第7実施形態と同様であるため、異なる部分についてのみ説明する。
本開示は、実施例に準拠して記述されたが、本開示は当該実施例や構造に限定されるものではないと理解される。本開示は、様々な変形例や均等範囲内の変形をも包含する。加えて、様々な組み合わせや形態、さらには、それらに一要素のみ、それ以上、あるいはそれ以下、を含む他の組み合わせや形態をも、本開示の範疇や思想範囲に入るものである。
Claims (22)
- 第1導電型基板(1)と、前記第1導電型基板(1)上に形成された第1導電型のドリフト層(2)と、前記ドリフト層(2)上に形成された第2導電型層(3)と、前記第2導電型層(3)上に形成された第1導電型層(4)とを有する炭化珪素からなる半導体基板(5)と、
前記半導体基板(5)のうちのトランジスタセル領域(R1)に形成されたトランジスタと、
前記トランジスタセル領域(R1)の外周を囲む外周耐圧構造領域(R2)に形成された外周耐圧構造とを有し、
前記外周耐圧構造領域(R2)に備えられた外周耐圧構造は、
前記トランジスタセル領域(R1)の外周を囲むように形成され、前記第1導電型層(4)と前記第2導電型層(3)よりも深く、前記ドリフト層(2)に達する第1凹部(17)と、
前記第1凹部(17)の内周側の側面の位置において、前記トランジスタセル領域(R1)の外周を囲むように形成された第1トレンチ(13、45)と、
前記第1トレンチ(13、45)内に埋め込まれ、前記第1凹部(17)の側面を構成する第2導電型埋込層(15、46)を含む電界緩和構造と、を有する炭化珪素半導体装置。 - 前記第1導電型層(4)の厚みよりも深く、前記トランジスタセル領域(R1)の外周を囲むように形成された第2凹部(16)を有し、
前記第1凹部(17)は、前記第2凹部(16)よりも前記トランジスタセル領域(R1)の外周側に形成され、前記第2凹部(16)よりも深く形成されており、
前記第1トレンチ(13、45)は、前記第2凹部(16)と前記第1凹部(17)の境界位置に形成されている請求項1に記載の炭化珪素半導体装置。 - 前記第2凹部(16)の底面のうち前記第1凹部(17)側と、前記第1凹部(17)の底面のうちの前記第2凹部(16)側には、前記第2導電型埋込層(15、46)に接続される第2導電型層(18、19)が形成され、これらの接続構造により構成される第2導電型リサーフ層(20)によって前記電界緩和構造が構成されている請求項2に記載の炭化珪素半導体装置。
- 前記第1トレンチ(13、45)は、前記第2凹部(16)と前記第1凹部(17)との境界位置から更に外周側にも複数本形成され、前記第1トレンチ(13、45)それぞれに前記第2導電型埋込層(15、46)が備えられており、複数の前記第1トレンチ(13、45)内に備えられた前記第2導電型埋込層(15、46)により構成されるガードリング構造によって前記電界緩和構造が構成されている請求項2に記載の炭化珪素半導体装置。
- 前記第2凹部(16)と前記第1凹部(17)との境界位置よりも内側にも形成され、前記第1トレンチ(13、45)それぞれに前記第2導電型埋込層(15、46)が備えられており、複数の前記第1トレンチ(13、45)内に備えられた前記第2導電型埋込層(15、46)により構成されるガードリング構造によって前記電界緩和構造が構成されている請求項2または4に記載の炭化珪素半導体装置。
- 前記ガードリング構造を構成する前記第1トレンチ(13、45)は、前記トランジスタセル領域(R1)の外周方向に向かうに連れて幅が狭くされている請求項4または5に記載の炭化珪素半導体装置。
- 前記トランジスタセル領域(R1)は、
前記第2導電型層(3)を第1ゲート領域とすると共に前記第1導電型層(4)をソース領域とし、
前記第1導電型層(4)および第2導電型層(3)を貫通して前記ドリフト層(2)まで達する第2トレンチ(6)と、
前記第2トレンチ(6)の内壁上にエピタキシャル成長によって形成された第1導電型のチャネル層(7)と、
前記チャネル層(7)の上に形成された第2導電型の第2ゲート領域(8)と、
前記第1導電型層(4)に電気的に接続されたソース電極(10)と、
前記第1導電型基板(1)に電気的に接続されたドレイン電極(12)とを有し、
前記第1ゲート領域(3)と前記第2ゲート領域(8)の少なくとも一方の電位を制御することにより、ソース-ドレイン間の電流を制御するJFETが形成されている請求項1ないし6のいずれか1つに記載の炭化珪素半導体装置。 - 前記第1トレンチ(13)と前記第2トレンチ(6)が同じ深さとされ、前記第1トレンチ(13)には、第1導電型埋込層(14)を介して前記第2導電型埋込層(15)が形成されている請求項7に記載の炭化珪素半導体装置。
- 前記トランジスタセル領域(R1)は、
前記第2導電型層(3)をベース領域とすると共に前記第1導電型層(4)をソース領域とし、
前記ソース領域と前記ドリフト層との間に位置する前記ベース領域の表面に形成されたゲート絶縁膜(40)と、
前記ゲート絶縁膜(40)の表面に形成されたゲート電極(41)と、
前記第1導電型層(4)に電気的に接続されたソース電極(10)と、
前記第1導電型基板(1)に電気的に接続されたドレイン電極(12)と、
前記第1導電型層(4)および第2導電型層(3)を貫通して前記ドリフト層(2)まで達する第2トレンチ(42)と、
前記第2トレンチ(42)内に埋め込まれた第2導電型のディープ層(43)とを有し、
前記ゲート電極(41)の電位を制御することにより、ソース-ドレイン間の電流を制御するMOSFETが形成されている請求項1ないし6のいずれか1つに記載の炭化珪素半導体装置。 - 前記第1トレンチ(45)と前記第2トレンチ(42)が同じ深さとされている請求項9に記載の炭化珪素半導体装置。
- 前記トランジスタセル領域(R1)には、
前記第1導電型層(4)および前記第2導電型層(3)を貫通して前記ドリフト層(2)まで達するトレンチ(6)が形成され、該トレンチ内(6)に前記ゲート絶縁膜(40)および前記ゲート電極(41)が形成されることで、前記MOSFETがトレンチゲート構造とされており、
該トレンチゲート構造における前記トレンチ(6)よりも前記第2トレンチ(42)の深さが深くされている請求項9または10に記載の炭化珪素半導体装置。 - 第1導電型基板(1)と、前記第1導電型基板(1)上に形成された第1導電型のドリフト層(2)と、前記ドリフト層(2)上に形成された第2導電型層(3)と、前記第2導電型層(3)上に形成された第1導電型層(4)とを有する炭化珪素からなる半導体基板(5)と、
前記半導体基板(5)のうちのトランジスタセル領域(R1)に形成されたトランジスタと、
前記トランジスタセル領域の外周を囲む外周耐圧構造領域(R2)に形成された外周耐圧構造とを有してなる炭化珪素半導体装置の製造方法であって、
前記半導体基板(5)を用意する工程と、
前記外周耐圧構造領域(R2)に前記トランジスタセル領域(R1)の外周を囲む第1トレンチ(13、45)を形成する工程と、
前記第1トレンチ(13、45)内に埋め込まれる第2導電型埋込層(15、46)を形成する工程と、
前記トランジスタセル領域(R1)の外周を囲むように、前記第1導電型層(4)と前記第2導電型層(3)よりも深く、前記ドリフト層(2)に達する第1凹部(17)を形成する工程とを含み、
前記第1凹部(17)を形成する工程では、前記第1トレンチ(13、45)が前記第1凹部(17)の内周側の側面となる場所に位置し、前記第1凹部(17)の側面が第2導電型埋込層(15、46)にて構成されるようにすることで、前記第2導電型埋込層(15、46)を含む電界緩和構造を構成する炭化珪素半導体装置の製造方法。 - 前記第1導電型層(4)の厚みよりも深く、前記トランジスタセル領域(R1)の外周を囲むように第2凹部(16)を形成する工程を含み、
前記第1凹部(17)を形成する工程では、前記第1トレンチ(13、45)が前記第2凹部(16)と前記第1凹部(17)との境界位置に位置し、前記第2凹部(16)と前記第1凹部(17)との境界位置における前記第1凹部(17)の側面が第2導電型埋込層(15、46)にて構成されるようにすることで、前記第2導電型埋込層(15、46)を含む電界緩和構造を構成する請求項12に記載の炭化珪素半導体装置の製造方法。 - 前記第2凹部(16)を形成する工程および前記第1凹部(17)を形成する工程の後に、基板表面にマスク(32)を形成し、該マスク(32)を用いて基板法線方向から第2導電型不純物をイオン注入することにより、前記第2凹部(16)の底面のうち前記第1凹部(17)側と、前記第1凹部(17)の底面のうちの前記第2凹部(16)側に、前記第2導電型埋込層(15、46)に接続される第2導電型層(18、19)を形成し、これらの接続構造により第2導電型リサーフ層(20)を構成することによって前記電界緩和構造を構成する請求項13に記載の炭化珪素半導体装置の製造方法。
- 前記第1トレンチ(13、45)を形成する工程では、前記第2凹部(16)と前記第1凹部(17)との境界位置から更に外周側にも前記第1トレンチ(13、45)を複数本形成し、
前記第2導電型埋込層(15、46)を形成する工程では、前記第1トレンチ(13、45)それぞれに前記第2導電型埋込層(15、46)が形成されるようにすることで、複数の前記第1トレンチ(13、45)内に備えられた前記第2導電型埋込層(15、46)により構成されるガードリング構造によって前記電界緩和構造が構成されるようにする請求項12に記載の炭化珪素半導体装置の製造方法。 - 前記第1トレンチ(13、45)を形成する工程では、前記第2凹部(16)と前記第1凹部(17)との境界位置よりも内側にも前記第1トレンチ(13、45)を形成し、前記第1トレンチ(13、45)それぞれに前記第2導電型埋込層(15、46)が形成されるようにすることで、複数の前記第1トレンチ(13、45)内に備えられた前記第2導電型埋込層(15、46)により構成されるガードリング構造によって前記電界緩和構造が構成されるようにする請求項12または15に記載の炭化珪素半導体装置の製造方法。
- 前記第1トレンチ(13、45)を形成する工程は、複数の前記トレンチ(13、45)が前記トランジスタセル領域(R1)の外周方向に向かうに連れて幅が狭くなるようにする請求項15または16に記載の炭化珪素半導体装置の製造方法。
- 前記トランジスタセル領域(R1)において、
前記第1導電型層(4)および第2導電型層(3)を貫通して前記ドリフト層(2)まで達する第2トレンチ(6)を形成する工程と、
前記第2トレンチ(6)の内壁上にエピタキシャル成長によって第1導電型のチャネル層(7)を形成する工程と、
前記チャネル層(7)の上に第2導電型の第2ゲート領域(8)を形成する工程と、
前記第1導電型層(4)に電気的に接続されるソース電極(10)を形成する工程と、
前記第1導電型基板(1)に電気的に接続されるドレイン電極(12)を形成する工程とを有し、
前記第2導電型層(3)を第1ゲート領域とすると共に前記第1導電型層(4)をソース領域として、前記第1ゲート領域(3)と前記第2ゲート領域(8)の少なくとも一方の電位を制御することにより、ソース-ドレイン間の電流を制御するJFETを形成する請求項12ないし17のいずれか1つに記載の炭化珪素半導体装置の製造方法。 - 前記第1トレンチ(13)に第1導電型埋込層(14)を形成する工程を有し、
前記第2導電型埋込層(15)を形成する工程を前記第1トレンチ(13)に前記第1導電型埋込層(14)を形成した後に行い、
前記第1トレンチ(13)を形成する工程と前記第2トレンチ(6)を形成する工程とを同時に行い、
前記第1導電型埋込層(14)を形成する工程と前記チャネル層(7)を形成する工程とを同時に行い、
前記第2導電型埋込層(15)を形成する工程と前記第2ゲート領域(8)を形成する工程を同時に行う請求項18に記載の炭化珪素半導体装置の製造方法。 - 前記トランジスタセル領域(R1)において、
前記第1導電型層(4)および第2導電型層(3)を貫通して前記ドリフト層(2)まで達する第2トレンチ(42)を形成する工程と、
前記第2トレンチ(42)内に埋め込まれる第2導電型のディープ層(43)を形成する工程と、
前記第2導電型層(3)をベース領域とすると共に前記第1導電型層(4)をソース領域として、前記ソース領域と前記ドリフト層との間に位置する前記ベース領域の表面にゲート絶縁膜(40)を形成する工程と、
前記ゲート絶縁膜(40)の表面にゲート電極(41)を形成する工程と、
前記第1導電型層(4)に電気的に接続されるソース電極(10)を形成する工程と、
前記第1導電型基板(1)に電気的に接続されるドレイン電極(12)を形成する工程とを有し、
前記ゲート電極(41)の電位を制御することにより、ソース-ドレイン間の電流を制御するMOSFETを形成する請求項12ないし17のいずれか1つに記載の炭化珪素半導体装置の製造方法。 - 前記第1トレンチ(45)を形成する工程と前記第2トレンチ(42)を形成する工程を同時に行い、
前記第2導電型埋込層(46)を形成する工程と前記ディープ層(43)を形成する工程を同時に行う請求項20に記載の炭化珪素半導体装置の製造方法。 - 前記トランジスタセル領域(R1)において、
前記第1導電型層(4)および前記第2導電型層(3)を貫通して前記ドリフト層(2)まで達するトレンチ(6)を形成する工程を有し、該トレンチ内(6)に前記ゲート絶縁膜(40)および前記ゲート電極(41)を形成することで、前記MOSFETをトレンチゲート構造とし、該トレンチゲート構造における前記トレンチ(6)よりも前記第2トレンチ(42)の深さが深くなるようにする請求項20または21に記載の炭化珪素半導体装置の製造方法。
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WO2018008527A1 (ja) * | 2016-07-05 | 2018-01-11 | 株式会社デンソー | 炭化珪素半導体装置およびその製造方法 |
JP2018006630A (ja) * | 2016-07-05 | 2018-01-11 | 株式会社デンソー | 炭化珪素半導体装置およびその製造方法 |
JP2018006631A (ja) * | 2016-07-05 | 2018-01-11 | 株式会社デンソー | 炭化珪素半導体装置およびその製造方法 |
WO2018008529A1 (ja) * | 2016-07-05 | 2018-01-11 | 株式会社デンソー | 炭化珪素半導体装置およびその製造方法 |
CN109417089A (zh) * | 2016-07-05 | 2019-03-01 | 株式会社电装 | 碳化硅半导体装置及其制造方法 |
CN109417087A (zh) * | 2016-07-05 | 2019-03-01 | 株式会社电装 | 碳化硅半导体装置及其制造方法 |
CN109417087B (zh) * | 2016-07-05 | 2021-07-23 | 株式会社电装 | 碳化硅半导体装置及其制造方法 |
CN109417089B (zh) * | 2016-07-05 | 2021-09-28 | 株式会社电装 | 碳化硅半导体装置及其制造方法 |
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DE112012003282T5 (de) | 2014-04-30 |
US8901573B2 (en) | 2014-12-02 |
US20140145212A1 (en) | 2014-05-29 |
JP2013038308A (ja) | 2013-02-21 |
JP5482745B2 (ja) | 2014-05-07 |
SE1450265A1 (sv) | 2014-03-07 |
SE537601C2 (sv) | 2015-07-14 |
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