WO2012086099A1 - 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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- WO2012086099A1 WO2012086099A1 PCT/JP2011/002773 JP2011002773W WO2012086099A1 WO 2012086099 A1 WO2012086099 A1 WO 2012086099A1 JP 2011002773 W JP2011002773 W JP 2011002773W WO 2012086099 A1 WO2012086099 A1 WO 2012086099A1
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Definitions
- the present invention relates to a silicon carbide semiconductor device provided with a diode for measuring the temperature of a silicon carbide semiconductor element, and a method for manufacturing the same.
- a silicon carbide (SiC) semiconductor element can operate at a higher temperature than a semiconductor element formed of silicon (Si). However, since there is an upper limit to the operable temperature, it is preferable to mount a temperature sensor for measuring the temperature of the silicon carbide semiconductor element.
- Patent Document 1 There is one described in Patent Document 1 as a silicon carbide semiconductor device provided with a temperature sensor.
- a pn junction diode, a heterojunction diode, or a Schottky barrier diode (hereinafter referred to as “SBD”) is formed on the same substrate as an electrostatic induction transistor formed of silicon carbide. It is described as being used as a temperature sensor for measuring temperature.
- JP 2006-93382 A pages 2 to 8, FIGS. 1 to 4.
- Patent Document 1 has a problem that a specific structure and manufacturing method of a silicon carbide semiconductor device having an SBD used as a temperature sensor for measuring the temperature of a silicon carbide semiconductor element is not disclosed. there were.
- the present invention has been made to solve the above-described problems, and an object thereof is to provide a silicon carbide semiconductor device having an SBD for measuring the temperature of a silicon carbide semiconductor element.
- a silicon carbide semiconductor device includes a silicon carbide epitaxial substrate having an n-type silicon carbide substrate and an n-type silicon carbide drift layer formed on one surface of the silicon carbide substrate, and a silicon carbide epitaxial substrate.
- a silicon carbide semiconductor device comprising: a formed silicon carbide semiconductor element; and a Schottky barrier diode formed on a silicon carbide epitaxial substrate for measuring the temperature of the silicon carbide semiconductor element, wherein the Schottky barrier diode is The n-type cathode region of the surface portion of the silicon carbide drift layer, the first titanium electrode formed on the cathode region and serving as the Schottky electrode, and the surface layer portion of the silicon carbide drift layer are formed in contact with the cathode region N-type cathode contact region having a higher concentration than the cathode region, and formed on the cathode contact region. And a first ohmic electrode, those having a cathode region and a cathode contact region p-type first well region formed to surround the silicon carbide drift layer, a.
- a method for manufacturing a silicon carbide semiconductor device includes an n-type silicon carbide substrate and a silicon carbide epitaxial substrate having an n-type silicon carbide drift layer formed on one surface of the silicon carbide substrate,
- a method of manufacturing a silicon carbide semiconductor device comprising: a silicon carbide semiconductor element formed on a silicon carbide epitaxial substrate; and a Schottky barrier diode formed on the silicon carbide epitaxial substrate for measuring the temperature of the silicon carbide semiconductor element.
- a p-type first well region so as to surround the periphery of the n-type cathode region of the surface layer portion of the silicon carbide drift layer in the silicon carbide drift layer in order to form a Schottky barrier diode; And in contact with the cathode region in the surface layer portion of the silicon carbide drift layer and in the region surrounded by the first well region Forming a n-type cathode contact region having a higher concentration than the cathode region; forming a first ohmic electrode on the cathode contact region; and forming a first titanium electrode serving as a Schottky electrode on the cathode region. And a process.
- the silicon carbide semiconductor device of the present invention it is possible to provide a silicon carbide semiconductor device including an SBD for measuring the temperature of the silicon carbide semiconductor element.
- a silicon carbide semiconductor device including an SBD for measuring the temperature of the silicon carbide semiconductor element can be provided.
- FIG. 1 It is sectional drawing which shows silicon carbide semiconductor device 1a in Embodiment 1 of this invention, (a) is sectional drawing which shows SBD part 2 vicinity, (b) is sectional drawing which shows MOSFET part 3a. It is a top view which expands and shows the SBD part vicinity of the silicon carbide epitaxial substrate in Embodiment 1 of this invention. It is sectional drawing which shows a part of manufacturing method of the silicon carbide semiconductor device in Embodiment 1 of this invention. It is sectional drawing which shows a part of manufacturing method of the silicon carbide semiconductor device in Embodiment 1 of this invention. It is sectional drawing which shows a part of manufacturing method of the silicon carbide semiconductor device in Embodiment 1 of this invention. It is sectional drawing which shows a part of manufacturing method of the silicon carbide semiconductor device in Embodiment 1 of this invention.
- the anode current I A is a graph showing the relationship between the temperature T and the anode voltage V A of the SBD in the case of 1 .mu.A.
- FIG. 1 is a cross-sectional view showing a silicon carbide semiconductor device 1a according to the first embodiment of the present invention, in which (a) is a cross-sectional view showing the vicinity of an SBD portion 2, and (b) is a cross-sectional view showing a MOSFET portion 3a.
- FIG. 2 is an enlarged top view showing the vicinity of SBD portion 2 of silicon carbide epitaxial substrate 11 in the first embodiment of the present invention.
- FIG. 1 shows silicon carbide semiconductor device 1a cut along the same cross section as the AA cross section in FIG.
- silicon carbide semiconductor device 1 a is a silicon carbide semiconductor element on silicon carbide epitaxial substrate 11 in which n-type silicon carbide drift layer 8 is formed on one surface 7 of n-type silicon carbide substrate 6.
- a MOSFET section 3a in which a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is formed, and an SBD section 2 in which an SBD for measuring the temperature of the MOSFET is formed.
- the SBD portion 2 and the MOSFET portion 3a are shown separately. Actually, however, the SBD portion 2 and the MOSFET portion 3a are both formed on the same silicon carbide epitaxial substrate 11.
- an n-type cathode region 12 is formed in the surface layer portion of the silicon carbide drift layer 8, and in a portion deeper than the cathode region 12 of the silicon carbide drift layer 8.
- a p-type first well region 13 is formed.
- an n-type cathode contact region 16 having a concentration higher than that of the cathode region 12 is formed so as to surround the outer periphery of the cathode region 12 by the surface layer portion of the silicon carbide drift layer 8. Is formed.
- a p-type guard region 17 having a concentration higher than that of the first well region 13 is formed so as to surround the outer periphery of the cathode contact region 16 at the surface layer portion of the silicon carbide drift layer 8.
- the cathode region 12 and the cathode contact region 16 are in contact with each other, and the cathode region 12 and the cathode contact region 16 are surrounded by a p-type first well having a lower concentration than the guard region 17 in the silicon carbide drift layer 8. It is surrounded by a p-type region formed by the region 13 and the guard region 17.
- the region other than the region where the device of silicon carbide drift layer 8 is formed is covered with a field oxide film 18, and a polysilicon electrode 21 serving as a gate electrode is formed on this field oxide film 18. .
- An interlayer insulating film 22 is formed on silicon carbide drift layer 8 and polysilicon electrode 21, and anode contact holes are formed on cathode region 12, cathode contact region 16, guard region 17, and polysilicon electrode 21.
- 23a, a cathode contact hole 23b, a guard contact hole 23c, and a gate contact hole 23d are formed.
- a cathode ohmic electrode 26b is formed on the cathode contact region 16 at the bottom of the cathode contact hole 23b, and a guard ohmic electrode 26c is formed on the guard region 17 at the bottom of the guard contact hole 23c. ing.
- an anode titanium electrode 27a is formed so as to contact the cathode region 12 and cover the inner surface of the anode contact hole 23a, contact with the cathode ohmic electrode 26b, and the cathode titanium electrode 27b cover the inner surface of the cathode contact hole 23b.
- a guard titanium electrode 27c is formed so as to contact the guard ohmic electrode 26c and cover the inner surface of the guard contact hole 23c.
- the guard titanium electrode 27c contacts the polysilicon electrode 21 and covers the inner surface of the gate contact hole 23d. 27d is formed.
- the anode titanium electrode 27a is a Schottky electrode that forms a Schottky barrier with the cathode region 12.
- anode wiring 28a is formed so as to contact the anode titanium electrode 27a and fill the anode contact hole 23a
- the cathode wiring 28b is formed so as to contact the cathode titanium electrode 27b and fill the cathode contact hole 23b.
- a guard wiring 28c is formed to contact the electrode 27c and fill the guard contact hole 23c
- a gate wiring 28d is formed to contact the gate titanium electrode 27d and fill the gate contact hole 23d.
- a drain ohmic electrode 26f is formed on the other surface 31 of the silicon carbide substrate 6, and a drain wiring 28f is formed on the drain ohmic electrode 26f.
- the anode wiring 28a has an anode terminal 32a
- the cathode wiring 28b has a cathode terminal 32b
- the guard wiring 28c has a guard terminal 32c
- the gate wiring 28d has a gate terminal 32d
- the drain wiring 28f has a drain terminal 32f. Is connected.
- an n-type buried channel region 33 is formed in the surface portion of the silicon carbide drift layer 8 in the MOSFET portion 3a.
- a p-type second well region 36 having substantially the same concentration as that of the first well region 13 is formed in contact with the buried channel region 33 at a portion deeper than the buried channel region 33 of the silicon carbide drift layer 8.
- an n-type source region 37 having substantially the same concentration as the cathode contact region 16 is formed in the surface layer portion of the silicon carbide drift layer 8 so as to reach from the buried channel region 33 to the second well region 36.
- a p-type well contact region 38 having substantially the same concentration as the guard region 17 is formed on the surface layer portion of the silicon carbide drift layer 8 so as to be in contact with the source region 37 and the second well region 36.
- a gate insulating film 41 is formed on a part of the silicon carbide drift layer 8 of the MOSFET portion 3a, and a polysilicon electrode 21 serving as a gate electrode is formed on the gate insulating film 41.
- Polysilicon electrode 21 is formed across source region 37, second well region 36 and buried channel region 33 of silicon carbide drift layer 8 with gate insulating film 41 interposed therebetween.
- the polysilicon electrode 21 on the gate insulating film 41 described here and the polysilicon electrode 21 on the field oxide film 18 described above are one electrode formed continuously and are electrically connected. Has been.
- An interlayer insulating film 22 is formed on the silicon carbide drift layer 8 and the polysilicon electrode 21, and a source contact hole 23 e is formed on the source region 37 and the well contact region 38.
- a source ohmic electrode 26e is formed on the source region 37 and the well contact region 38 at a portion corresponding to the bottom of the source contact hole 23e.
- a source titanium electrode 27e is formed to contact the source ohmic electrode 26e and cover the inner surface of the source contact hole 23e, and a source wiring 28e is formed to contact the source titanium electrode 27e and fill the source contact hole 23e. ing.
- a source terminal 32e is connected to the source wiring 28e.
- drain ohmic electrode 26 f and the drain wiring 28 f are formed on the other surface 31 of the silicon carbide substrate 6 in the same manner as the SBD portion 2.
- the drain ohmic electrode 26f formed on the SBD part 2 and the MOSFET part 3a is one electrode formed continuously, and is electrically connected. The same applies to the drain wiring 28f.
- 3 to 14 are cross sectional views showing a part of the method for manufacturing silicon carbide semiconductor device 1a in the first embodiment of the present invention.
- (a) shows the vicinity of the SBD part 2
- (b) shows the MOSFET part 3a.
- an n-type low-resistance silicon carbide substrate 6 having a plane orientation of one surface 7 of (0001) plane and a 4H polytype is prepared.
- an n-type silicon carbide drift layer 8 having a thickness of 4 to 200 ⁇ m is formed on one surface 7 of silicon carbide substrate 6 by a CVD (Chemical Vapor Deposition) method.
- a silicon carbide epitaxial substrate 11 is formed.
- the n-type impurity concentration of silicon carbide drift layer 8 is set to a value in the range of 1 ⁇ 10 14 to 1 ⁇ 10 17 cm ⁇ 3 , for example.
- the plane orientation of silicon carbide substrate 6 may be a (000-1) plane, a (11-20) plane, or the like, and may be inclined by 8 ° or less from these plane orientations.
- the polytype may be 6H or 3C.
- silicon carbide epitaxial substrate 11 may be heated at 200 to 800 ° C., or may not be positively heated.
- the n-type impurity to be ion-implanted for example, nitrogen, phosphorus, arsenic or the like is used, and as the p-type impurity, for example, aluminum, boron or gallium is used.
- n-type impurities are ion-implanted from the surface side of the silicon carbide drift layer 8 to form a cathode region 12 and a buried channel region 33 in the surface layer portion of the silicon carbide drift layer 8.
- the cathode region 12 and the buried channel region 33 have substantially the same impurity concentration and are formed by a single ion implantation process.
- the n-type impurity concentration for ion implantation exceeds, for example, 1 ⁇ 10 15 to 1 ⁇ 10 so as to exceed the impurity concentration value of the silicon carbide drift layer 8 and not to exceed the impurity concentration value of the cathode contact region 16 described later. Set to a value in the range of 18 cm ⁇ 3 .
- the depth of ion implantation is, for example, a value within a range of 0.4 ⁇ m from the surface of silicon carbide drift layer 8.
- p-type impurities are ion-implanted from the surface side of the silicon carbide drift layer 8, and the first well region 13 is carbonized in contact with the cathode region 12 at a portion deeper than the cathode region 12.
- a second well region 36 is formed in contact with the buried channel region 33 at a site deeper than the buried channel region 33 of the silicon drift layer 8.
- the first well region 13 and the second well region 36 have substantially the same impurity concentration and are formed by a single ion implantation process.
- the p-type impurity concentration for ion implantation exceeds the impurity concentration value of the silicon carbide drift layer 8 and is set to a value in the range of 1 ⁇ 10 15 to 1 ⁇ 10 19 cm ⁇ 3 , for example.
- the depth of the ion implantation is set so that the bottom surfaces of the first well region 13 and the second well region 36 do not exceed the bottom surface of the silicon carbide drift layer 8, for example, a value within a range of 0.3 to 2 ⁇ m.
- n-type impurities are ion-implanted from the surface side of silicon carbide drift layer 8 to form cathode contact region 16 and source region 37 in the surface layer portion of silicon carbide drift layer 8.
- the cathode contact region 16 is formed so as to surround the outer periphery of the cathode region 12, and the cathode contact region 16 and the cathode region 12 are in contact with each other.
- the cathode contact region 16 and the source region 37 are n-type having substantially the same impurity concentration and higher concentration than the cathode region 12 and the buried channel region 33, and are formed by a single ion implantation process.
- the n-type impurity concentration into which ions are implanted exceeds the impurity concentration values of the first well region 13 and the second well region 36, for example, a value within the range of 1 ⁇ 10 17 to 1 ⁇ 10 21 cm ⁇ 3.
- the depth of ion implantation is set such that the bottom surfaces of the cathode contact region 16 and the source region 37 do not exceed the bottom surfaces of the first well region 13 and the second well region 36, respectively.
- cathode contact region 16 and the source region 37 By forming the cathode contact region 16 and the source region 37, good ohmic contact can be obtained with the electrodes formed on the cathode contact region 16 and the source region 37, respectively, in a later step.
- guard region 17 and well contact region 38 are ion-implanted from the surface side of silicon carbide drift layer 8 to form guard region 17 and well contact region 38 in the surface layer portion of silicon carbide drift layer 8.
- the guard region 17 is formed so as to surround the outer periphery of the cathode contact region 16.
- cathode region 12 and cathode contact region 16 are surrounded by silicon carbide drift layer 8 by p-type regions of first well region 13 and guard region 17.
- the well contact region 38 is formed in contact with the source region 37 and the second well region 36.
- the guard region 17 and the well contact region 38 are p-type with substantially the same impurity concentration and higher concentration than the first well region 13 and the second well region 36, and are formed by a single ion implantation process.
- the p-type impurity concentration for ion implantation exceeds the impurity concentration values of the first well region 13 and the second well region 36, and is in the range of, for example, 1 ⁇ 10 17 to 1 ⁇ 10 21 cm ⁇ 3 .
- the depth of ion implantation is set so that the bottom surfaces of the guard region 17 and the well contact region 38 do not exceed the bottom surfaces of the first well region 13 and the second well region 36, respectively.
- guard region 17 and the well contact region 38 By forming the guard region 17 and the well contact region 38, it is possible to obtain good ohmic contact with electrodes formed on the guard region 17 and the well contact region 38, respectively, in a later step.
- the region 13 and the second well region 36 can be electrically connected with low resistance.
- silicon carbide epitaxial substrate 11 is preferably ion-implanted by heating to 150 ° C. or higher. Thereby, the guard region 17 and the well contact region 38 having a low sheet resistance can be obtained.
- heat treatment is performed in an inert gas atmosphere such as argon or nitrogen or in a vacuum at a temperature in the range of 1500 to 2200 ° C. for a time in the range of 0.5 to 60 minutes.
- This heat treatment may be performed with the surface of silicon carbide epitaxial substrate 11 covered with a carbon film. In this way, it is possible to prevent the surfaces of silicon carbide substrate 6 and silicon carbide drift layer 8 from being roughened by an etching action due to residual moisture or residual oxygen in the apparatus during heat treatment.
- the surface of the silicon carbide drift layer 8 is thermally oxidized to form a sacrificial oxide film, and then the sacrificial oxide film is removed with hydrofluoric acid. Thereby, the surface altered layer of silicon carbide drift layer 8 can be removed, and a clean surface can be obtained.
- a field oxide film 18 is formed on silicon carbide drift layer 8.
- Field oxide film 18 is formed by depositing and patterning a silicon oxide film by a CVD method or the like. Here, an opening is formed on a region of silicon carbide drift layer 8 where a device is formed, and the device is formed. Patterning is performed so that the region other than the region to be covered is covered with the field oxide film 18.
- the thickness of the field oxide film 18 may be 0.5 to 2 ⁇ m.
- a gate insulating film 41 is formed on silicon carbide drift layer 8 of MOSFET portion 3a.
- the gate insulating film 41 is formed by forming a silicon oxide film by a thermal oxidation method or a CVD method, and has a thickness of about 50 nm.
- a polysilicon electrode 21 to be a gate electrode is formed on the gate insulating film 41 and the field oxide film 18.
- Polysilicon electrode 21 is formed across source region 37, second well region 36 and buried channel region 33 of silicon carbide drift layer 8 with gate insulating film 41 interposed therebetween.
- the polysilicon electrode 21 is preferably a high concentration n-type.
- an interlayer insulating film 22 is formed on the silicon carbide drift layer 8 and the polysilicon electrode 21, and the cathode contact hole 23b and the guard region are formed on the cathode contact region 16 by dry etching or the like.
- a guard contact hole 23 c is formed on 17 and a source contact hole 23 e is formed on the source region 37.
- the interlayer insulating film 22 a silicon oxide film formed by a CVD method or the like is used.
- the cathode ohmic electrode 26b is formed on the cathode contact region 16 at the portion corresponding to the bottom of the cathode contact hole 23b, and the guard ohmic electrode 26c is formed on the guard region 17 at the portion corresponding to the bottom of the guard contact hole 23c.
- the source ohmic electrode 26e is formed on the source region 37 and the well contact region 38 at the portion corresponding to the bottom of the source contact hole 23e, and the drain ohmic electrode 26f is formed on the other surface 31 of the silicon carbide substrate 6.
- nickel silicide As the cathode ohmic electrode 26b, the guard ohmic electrode 26c, the source ohmic electrode 26e, and the drain ohmic electrode 26f, for example, nickel silicide is used.
- a method for forming nickel silicide a metal film containing nickel as a main component is formed on the entire surface of the substrate from the interlayer insulating film 22, and nickel is also used as the main component on the other surface 31 of the silicon carbide substrate 6. Then, a heat treatment is performed at 600 to 1100 ° C. Thereby, nickel silicide is formed between the SiC and the metal film. Thereafter, the metal film remaining on the interlayer insulating film 22 is removed by wet etching using sulfuric acid, nitric acid, hydrochloric acid, a mixed solution thereof with hydrogen peroxide, or the like.
- heat treatment may be performed again after removing the metal film remaining on the interlayer insulating film 22.
- heat treatment may be performed again after removing the metal film remaining on the interlayer insulating film 22.
- an anode contact hole 23 a is formed on the cathode region 12, and a gate contact hole 23 d is formed on the polysilicon electrode 21.
- a method of forming the anode contact hole 23a and the gate contact hole 23d first, the surface of the interlayer insulating film 22 excluding a portion where the anode contact hole 23a and the gate contact hole 23d are formed is covered, and the cathode contact hole 23b, guard contact A resist film is formed so as to fill hole 23c and source contact hole 23e. Then, the anode contact hole 23a and the gate contact hole 23d are formed by wet etching or dry etching, respectively.
- the resist is removed, and the surface-modified layers on the bottom surfaces of the anode contact hole 23a, the cathode contact hole 23b, the guard contact hole 23c, the gate contact hole 23d, and the source contact hole 23e are removed by hydrofluoric acid or sputtering to clean the resist. Get a plane.
- the gate contact hole 23d may be formed on the gate insulating film 41 so as not to penetrate the polysilicon electrode 21 when forming the gate contact hole 23d.
- a titanium film is formed from the surface side of the interlayer insulating film 22 by sputtering or vapor deposition.
- the titanium film is in contact with the cathode region 12, the cathode ohmic electrode 26b, the guard ohmic electrode 26c, the polysilicon electrode 21 and the source ohmic electrode 26e, and the anode contact hole 23a, the cathode contact hole 23b, the guard contact hole 23c, and the gate contact hole 23d. And formed so as to cover the inner surface of the source contact hole 23e.
- an aluminum film is formed from the surface side of the titanium film by sputtering or vapor deposition.
- the aluminum film is formed so as to contact the titanium film and fill the anode contact hole 23a, the cathode contact hole 23b, the guard contact hole 23c, the gate contact hole 23d, and the source contact hole 23e.
- a metal film called a barrier metal such as titanium nitride may be formed on the titanium film before forming the aluminum film.
- the anode titanium electrode 27a and the anode wiring 28a, the cathode titanium electrode 27b and the cathode wiring 28b, the guard titanium electrode 27c and the guard wiring 28c, the gate titanium electrode 27d and the gate wiring 28d, the source titanium electrode 27e and the source A wiring 28e is formed.
- anode titanium electrode 27a By providing the anode titanium electrode 27a in contact with the cathode region 12, a Schottky barrier is formed between the cathode region 12 and the anode titanium electrode 27a. On the other hand, ohmic contact is obtained between the gate titanium electrode 27d and the polysilicon electrode 21 as the gate electrode.
- the drain wiring 28f is formed on the drain ohmic electrode 26f with nickel, gold or the like, and the state shown in FIG. 14 is obtained.
- anode terminal 32a the cathode terminal 32b, the guard terminal 32c, the gate terminal 32d, the source terminal 32e, and the drain terminal 32f are formed, and the silicon carbide semiconductor device 1a shown in FIG. 1 is completed.
- the anode terminal 32a and the cathode terminal 32b are connected to a control IC (not shown).
- the control IC includes a current source and a voltmeter.
- This current source can flow a constant current in the forward direction of the SBD from the anode terminal 32a to the cathode terminal 32b with the cathode terminal 32b as a ground potential.
- the voltmeter can measure the voltage between the anode terminal 32a and the cathode terminal 32b.
- a constant current of 1 ⁇ A is passed from the anode terminal 32a to the cathode terminal 32b by the current source of the control IC.
- the voltmeter of the control IC measures the voltage between the anode terminal 32a and the cathode terminal 32b when a constant current is flowing.
- the control IC determines that the MOSFET is in an overtemperature state and sends a stop signal to the MOSFET. For example, assuming that the set voltage when the MOSFET reaches 250 ° C. is 0.4V, the control IC transmits a stop signal to the MOSFET when the measured voltage falls below 0.4V for a certain time.
- FIG. 15 shows the result of calculating the current-voltage characteristics of the SBD according to the first embodiment of the present invention by device simulation.
- the horizontal axis indicates the voltage (anode voltage V A ) of the anode terminal 32a
- the vertical axis indicates the current flowing through the anode terminal 32a (anode current I A ), that is, the current flowing through the SBD.
- a simulation is performed when the temperature T of the SBD, that is, the MOSFET temperature T is 300K, 400K, and 500K.
- the cathode terminal 32b is set to the ground potential, and the impurity concentration of the cathode region 12 is set to 1 ⁇ 10 17 cm ⁇ 3 .
- the current source control IC if the flow 1 .mu.A constant current (determination current) from the anode terminal 32a to the cathode terminal 32b, i.e., a case anode current I A is 1 .mu.A.
- the anode current I A that is, the level at which the determination current is 1 ⁇ A is indicated by a broken line.
- Figure 16 is an anode current I A is a graph showing the relationship between the temperature T and the anode voltage V A of the SBD in the case of 1 .mu.A.
- the horizontal axis indicates the temperature T of the SBD
- the vertical axis indicates the anode voltage VA .
- the plot points in FIG. 16 are those respectively, plotted points anode current I A in FIG. 15 is 1 .mu.A.
- FIG. 16 shows that the anode voltage VA is 0.4 V when the temperature T of the SBD, that is, the temperature T of the MOSFET is 523 K (250 ° C.). Therefore, as described above, in order to prevent the temperature T of the MOSFET from exceeding 250 ° C., when the determination current is 1 ⁇ A, the set temperature in the control IC is set to 0.4 V, and the anode voltage V A is set to The control IC may transmit a stop signal to the MOSFET when the measured voltage falls below 0.4 V for a certain time.
- anode voltage V A (here, 0.4 V) corresponding to a set temperature (here, set to 523 K (250 ° C.)) at which the control IC should stop the MOSFET can be obtained.
- a set temperature here, set to 523 K (250 ° C.)
- the temperature T of the SBD is 300K
- the anode voltage V A is 0.4V when the 523K (250 ° C.) from 16
- the set voltage was determined to be 0.4V.
- a simulation may be performed from the beginning when the temperature T is 523 K (250 ° C.), and the set voltage may be determined from the result.
- the current-voltage characteristics of the SBD are obtained by simulation, and from this result, the set voltage at which the control IC judges that the MOSFET is in an overtemperature state is determined.
- the set voltage may be determined from the result of measuring the characteristics.
- Embodiment 1 of the present invention has an effect that it is possible to provide a silicon carbide semiconductor device 1a having an SBD for measuring the temperature of a MOSFET by adopting the above-described configuration.
- the gate insulating film 41 and the polysilicon electrode 21 are provided, and the gate titanium electrode 27d is provided on the polysilicon electrode 21, the anode titanium electrode 27a and the gate titanium electrode 27d which are Schottky electrodes are formed in the same process. Can be formed. By forming these in the same process, a dedicated process for manufacturing the SBD part 2 of the silicon carbide semiconductor device 1a can be reduced, and productivity can be improved.
- the source region 37, the source ohmic electrode 26e, and the second well region 36 are provided, the source region 37 and the cathode contact region 16 can be formed in the same process, and the source ohmic electrode 26e and the cathode ohmic electrode 26b are formed.
- the second well region 36 and the first well region 13 can be formed in the same process.
- the guard region 17 and the well contact region 38 can be formed in the same process, and the guard ohmic electrode 26c, the cathode ohmic electrode 26b, and the source ohmic electrode 26e Can be formed in the same process.
- the dedicated process for manufacturing the SBD part 2 of the silicon carbide semiconductor device 1a can be further reduced, and the productivity can be improved.
- the guard region 17 it is possible to suppress the switching noise from affecting the SBD.
- the control IC By connecting a control IC to the anode terminal 32a and the cathode terminal 32b, and the control IC includes a current source and a voltmeter, the temperature of the MOSFET can be easily measured, and an overtemperature of the MOSFET can be detected. .
- the cathode region 12 and the buried channel region 33 are formed in the surface layer portion of the silicon carbide drift layer 8.
- the surface layer portion of silicon carbide drift layer 8 may be used as it is as cathode region 12 and buried channel region 33 without particularly forming cathode region 12 and buried channel region 33.
- the silicon carbide semiconductor element for measuring temperature by SBD is a MOSFET.
- the present invention is not limited to a MOSFET, and may be an IGBT (Insulated Gate Bipolar Transistor), JFET (Junction FET), SIT (Static Induction Transistor), or the like.
- IGBT Insulated Gate Bipolar Transistor
- JFET Joint FET
- SIT Static Induction Transistor
- FIG. 17 is a cross-sectional view showing silicon carbide semiconductor device 1b according to the second embodiment of the present invention, where (a) is a cross-sectional view showing the vicinity of pn junction diode portion 42, and (b) is a cross-sectional view showing MOSFET portion 3b. It is.
- the same reference numerals as those in FIG. 1 denote the same or corresponding components, and the description thereof is omitted.
- the first embodiment of the present invention is different from the first embodiment in that the diode as the MOSFET temperature sensor is not a SBD but a pn junction diode. Further, the structure in which the buried channel region 33 in the surface layer portion of the silicon carbide drift layer 8 is omitted is different.
- silicon carbide semiconductor device 1b includes, on silicon carbide epitaxial substrate 11, MOSFET portion 3b in which a MOSFET which is a silicon carbide semiconductor element is formed, and pn junction diode portion 42 in which a pn junction diode is formed. ing.
- an n-type shallow well region 43 serving as a cathode region is formed in the surface layer portion 2 of the silicon carbide drift layer 8, and the shallow well region 43 and A p-type deep well region 46 is formed in contact with and deeper than the shallow well region 43.
- p-type third well region 47 is formed in the surface layer portion of silicon carbide drift layer 8 so as to partially overlap the outer periphery of shallow well region 43 and deep well region 46 and surround the outer periphery.
- a p-type anode region 48 having a higher concentration than the third well region 47 is formed, and an n-type having a higher concentration than the shallow well region 43.
- the cathode contact region 16 is formed so as to surround the outer periphery of the anode region 48 at the surface layer portion.
- p-type guard region 17 having a concentration higher than that of third well region 47 is formed so as to surround the outer periphery of cathode contact region 16 at the surface layer portion of third well region 47 of silicon carbide drift layer 8.
- Interlayer insulating film 22 is formed on silicon carbide drift layer 8 and polysilicon electrode 21, and anode contact holes are formed on anode region 48, cathode contact region 16, guard region 17, and polysilicon electrode 21.
- 23a, a cathode contact hole 23b, a guard contact hole 23c, and a gate contact hole 23d are formed.
- An anode ohmic electrode 26 a is formed on the anode region 48 on the bottom of the anode contact hole 23 a, and a cathode ohmic electrode 26 b is formed on the cathode contact region 16 on the bottom of the cathode contact hole 23 b on the guard region 17.
- Guard ohmic electrodes 26c are respectively formed at portions corresponding to the bottoms of the guard contact holes 23c.
- an anode titanium electrode 27a is formed so as to contact the anode ohmic electrode 26a and cover the inner surface of the anode contact hole 23a.
- the other titanium electrodes, the wirings formed on the titanium electrodes, the drain ohmic electrode 26f, the drain wiring 28f, and the terminals are the same as in the first embodiment of the present invention, and thus the description thereof is omitted.
- a p-type second well region 36 having substantially the same concentration as that of the third well region 47 is formed in the surface portion of the silicon carbide drift layer 8 in the MOSFET portion 3b.
- an n-type source region 37 having substantially the same concentration as the cathode contact region 16 is formed in the surface layer portion of the second well region 36 of the drift layer 8.
- a p-type well contact region 38 having substantially the same concentration as the anode region 48 and the guard region 17 is formed in the surface layer portion of the silicon carbide drift layer 8 so as to be in contact with the source region 37 and the second well region 36.
- the polysilicon electrode 21 is formed over the source region 37 and the second well region 36 of the silicon carbide drift layer 8 via the gate insulating film 41. Since the interlayer insulating film 22, the source contact hole 23e, and other electrodes are the same as in the first embodiment of the present invention, the description thereof is omitted.
- 18 to 25 are cross sectional views showing a part of the method for manufacturing silicon carbide semiconductor device 1b in the second embodiment of the present invention.
- (a) shows the vicinity of the pn junction diode part 42
- (b) shows the MOSFET part 3b.
- n-type silicon carbide drift layer 8 is formed on one surface 7 of n-type silicon carbide substrate 6, and thereafter, p-type deep well region 46 and cathode are formed by ion implantation.
- An n-type shallow well region 43 to be a region is formed at a time.
- the depth of the shallow well region 43 is set to a value within 0.6 ⁇ m, for example, the depth of the deep well region 46 is deeper than the bottom of the shallow well region 43, and the second well region 36 and the third third region formed in a later step. It is set deeper than the bottom of the well region 47.
- the n-type impurity concentration of silicon carbide drift layer 8 is set to a value in the range of 1 ⁇ 10 14 to 1 ⁇ 10 17 cm ⁇ 3 , for example. Further, the impurity concentration of shallow well region 43 and deep well region 46 exceeds the value of the impurity concentration of silicon carbide drift layer 8, and the impurities of second well region 36 and third well region 47 to be formed in a later step are used. Set to a value that does not exceed the density value.
- p-type impurities are ion-implanted to form the third well region 47 and the second well region 36 in the surface layer portion of the silicon carbide drift layer 8.
- the third well region 47 is formed so as to partially overlap the shallow well region 43 and the deep well region 46 and surround the outer periphery of the shallow well region 43 and the deep well region 46.
- the depth of the third well region 47 is set so that the bottom thereof is deeper than the bottom of the shallow well region 43 and shallower than the bottom of the deep well region 46.
- the third well region 47 and the second well region 36 have substantially the same impurity concentration and are formed by a single ion implantation process.
- the p-type impurity concentration for ion implantation exceeds the impurity concentration value of the silicon carbide drift layer 8 and is set to a value in the range of 1 ⁇ 10 15 to 1 ⁇ 10 19 cm ⁇ 3 , for example.
- the cathode contact region 16 is formed in the surface layer portion of the shallow well region 43 of the silicon carbide drift layer 8, and the source region is formed in the surface layer portion of the second well region 36. 37 is formed.
- the cathode contact region 16 and the source region 37 are n-type with substantially the same impurity concentration and higher concentration than the shallow well region 43, and are formed by a single ion implantation process.
- the n-type impurity concentration into which ions are implanted exceeds the impurity concentration values of the first well region 13 and the second well region 36, for example, a value within the range of 1 ⁇ 10 17 to 1 ⁇ 10 21 cm ⁇ 3. To do.
- the anode region 48 is formed in the surface layer portion of the shallow well region 43 of the silicon carbide drift layer 8, and the guard region 17 is formed in the surface layer portion of the third well region 47.
- Well contact regions 38 are formed in the surface layer portion of the second well region 36, respectively.
- the anode region 48 is disposed so as to be surrounded by the cathode contact region 16.
- the anode region 48, the guard region 17, and the well contact region 38 have substantially the same impurity concentration and are higher in p-type than the third well region 47 and the second well region 36, and are formed by a single ion implantation process.
- the depths of the anode region 48, the guard region 17 and the well contact region 38 are set so as not to exceed the bottom surface of the shallow well region 43, and the impurity concentration is, for example, in the range of 1 ⁇ 10 17 to 1 ⁇ 10 21 cm ⁇ 3 . The value within.
- heat treatment is performed in an inert gas atmosphere such as argon or nitrogen or in a vacuum at a temperature in the range of 1500 to 2200 ° C. for a time in the range of 0.5 to 60 minutes.
- an inert gas atmosphere such as argon or nitrogen or in a vacuum
- the ion-implanted impurity is electrically activated.
- a field oxide film 18 is formed, and a gate insulating film 41 is formed. Then, the polysilicon electrode 21 is formed on the gate insulating film 41 and the field oxide film 18. Polysilicon electrode 21 is formed across source region 37 and second well region 36 of silicon carbide drift layer 8 with gate insulating film 41 interposed therebetween.
- the interlayer insulating film 22 is formed on the silicon carbide drift layer 8 and the polysilicon electrode 21, and the anode contact hole 23a and the cathode contact region are formed on the anode region 48 by dry etching or the like.
- a cathode contact hole 23 b is formed on 16
- a guard contact hole 23 c is formed on the guard region 17
- a source contact hole 23 e is formed on the source region 37.
- an anode ohmic electrode 26a, a cathode ohmic electrode 26b, a guard ohmic electrode 26c, and a source ohmic electrode 26e are formed at a portion corresponding to the bottom of each contact hole.
- drain ohmic electrode 26 f is formed on the other surface 31 of silicon carbide substrate 6.
- a gate contact hole 23 d is formed on the polysilicon electrode 21.
- a titanium film is formed from the surface side of the interlayer insulating film 22.
- the titanium film is formed so as to cover the inner surfaces of the anode contact hole 23a, the cathode contact hole 23b, the guard contact hole 23c, the gate contact hole 23d, and the source contact hole 23e.
- an aluminum film is formed from the surface side of the titanium film.
- the aluminum film is formed so as to fill the anode contact hole 23a, the cathode contact hole 23b, the guard contact hole 23c, the gate contact hole 23d, and the source contact hole 23e.
- anode titanium electrode 27a and anode wiring 28a cathode titanium electrode 27b and cathode wiring 28b, guard titanium electrode 27c and guard wiring 28c, gate titanium electrode 27d and gate wiring 28d, source titanium electrode 27e and source A wiring 28e is formed.
- the drain wiring 28f is formed on the drain ohmic electrode 26f with nickel, gold or the like, and the state shown in FIG.
- anode terminal 32a, the cathode terminal 32b, the guard terminal 32c, the gate terminal 32d, the source terminal 32e, and the drain terminal 32f are formed, and the silicon carbide semiconductor device 1b shown in FIG. 17 is completed.
- Embodiment 2 of the present invention has an effect that it is possible to provide a silicon carbide semiconductor device 1b including a pn junction diode for measuring the temperature of the MOSFET by adopting the above configuration.
- the shallow well region 43 and the deep well region 46 that become the cathode region can be formed in the same process. By forming these in the same process, the manufacturing process of silicon carbide semiconductor device 1b can be reduced, and productivity can be improved.
- the anode region 48, the guard region 17, and the well contact region 38 can be formed in the same process. By forming these in the same process, the dedicated process for manufacturing the pn junction diode part 42 of the silicon carbide semiconductor device 1b can be reduced, and productivity can be improved.
- the anode ohmic electrode 26a, the cathode ohmic electrode 26b, the guard ohmic electrode 26c, and the source ohmic electrode 26e can be formed in the same process. By forming these in the same process, the dedicated process for manufacturing the pn junction diode part 42 of the silicon carbide semiconductor device 1b can be reduced, and productivity can be improved.
- the control IC By connecting a control IC to the anode terminal 32a and the cathode terminal 32b, and the control IC includes a current source and a voltmeter, the temperature of the MOSFET can be easily measured, and an overtemperature of the MOSFET can be detected. .
- a silicon carbide substrate 8 N-type silicon carbide drift layer 11
- Silicon carbide epitaxial substrate 12 N-type cathode region 13 p-type first well region 16 high-concentration n-type cathode contact region 17 high-concentration p-type guard region 21
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Abstract
Description
まず、この発明の実施の形態1における炭化珪素半導体装置1aの構成を説明する。図1は、この発明の実施の形態1における炭化珪素半導体装置1aを示す断面図であり、(a)はSBD部2付近を示す断面図、(b)はMOSFET部3aを示す断面図である。図2は、この発明の実施の形態1における炭化珪素エピタキシャル基板11のSBD部2付近を拡大して示す上面図である。尚、図1は、図2におけるA-A断面と同じ断面で切った炭化珪素半導体装置1aを示している。
図17は、この発明の実施の形態2における炭化珪素半導体装置1bを示す断面図であり、(a)はpn接合ダイオード部42付近を示す断面図、(b)はMOSFET部3bを示す断面図である。図17において、図1と同じ符号を付けたものは、同一または対応する構成を示しており、その説明を省略する。この発明の実施の形態1とは、MOSFETの温度センサとしてのダイオードをSBDではなく、pn接合ダイオードとした構成が相違している。また、炭化珪素ドリフト層8の表層部の埋め込みチャネル領域33を省略している構成が相違している。
2 SBD部
3a、3b MOSFET部
6 n型の炭化珪素基板
7 炭化珪素基板の一方の面
8 n型の炭化珪素ドリフト層
11 炭化珪素エピタキシャル基板
12 n型のカソード領域
13 p型の第1ウェル領域
16 高濃度のn型のカソードコンタクト領域
17 高濃度のp型のガード領域
21 ポリシリコン電極
26b カソードオーミック電極
26c ガードオーミック電極
26e ソースオーミック電極
27a アノードチタン電極
27d ゲートチタン電極
31 炭化珪素基板の他方の面
36 p型の第2ウェル領域
37 高濃度のn型のソース領域
38 高濃度のp型のウェルコンタクト領域
41 ゲート絶縁膜
Claims (10)
- n型の炭化珪素基板と前記炭化珪素基板の一方の面上に形成されたn型の炭化珪素ドリフト層とを有する炭化珪素エピタキシャル基板と、
前記炭化珪素エピタキシャル基板に形成された炭化珪素半導体素子と、
前記炭化珪素エピタキシャル基板に形成され、前記炭化珪素半導体素子の温度を測定するためのショットキーバリアダイオードと、
を備えた炭化珪素半導体装置であって、
前記ショットキーバリアダイオードは、
前記炭化珪素ドリフト層の表層部のn型のカソード領域と、
前記カソード領域上に形成され、ショットキー電極となる第1チタン電極と、
前記炭化珪素ドリフト層の表層部に前記カソード領域と接するように形成され、前記カソード領域よりも高濃度のn型のカソードコンタクト領域と、
前記カソードコンタクト領域上に形成された第1オーミック電極と、
前記炭化珪素ドリフト層内で前記カソード領域および前記カソードコンタクト領域の周囲を取り囲むように形成されたp型の第1ウェル領域と、
を有する炭化珪素半導体装置。 - 炭化珪素半導体素子は、
炭化珪素ドリフト層上に形成されたゲート絶縁膜と、
前記ゲート絶縁膜上に形成され、ゲート電極となるポリシリコン電極と、
前記ポリシリコン電極上に形成された第2チタン電極と、
を備えたことを特徴とする請求項1記載の炭化珪素半導体装置。 - 炭化珪素半導体素子は、
炭化珪素ドリフト層の表層部の、カソード領域とほぼ同じ濃度のn型のチャネル領域と、
前記炭化珪素ドリフト層の前記チャネル領域よりも深い部位に前記チャネル領域と接して形成され、第1ウェル領域とほぼ同じ濃度のp型の第2ウェル領域と、
前記炭化珪素ドリフト層の表層部に前記チャネル領域から前記第2ウェル領域にまで達するように形成され、カソードコンタクト領域とほぼ同じ濃度のn型のソース領域と、
前記ソース領域上に形成された第2オーミック電極と、
を備え、
ポリシリコン電極は、ゲート絶縁膜および前記チャネル領域を介して前記第2ウェル領域上に形成されたことを特徴とする請求項2記載の炭化珪素半導体装置。 - 第1ウェル領域は、
炭化珪素ドリフト層のカソード領域およびカソードコンタクト領域よりも深い部位に形成された低濃度領域と、前記炭化珪素ドリフト層の表層部に前記低濃度領域と接して形成され、低濃度領域よりも高濃度のp型のガード領域と、を有し、
ショットキーバリアダイオードは、
前記ガード領域上に形成された第3オーミック電極を備え、
炭化珪素半導体素子は、
炭化珪素ドリフト層の表層部にソース領域および第2ウェル領域と接するように形成され、前記ガード領域とほぼ同じ濃度のp型のウェルコンタクト領域を備え、
第2オーミック電極は、前記ウェルコンタクト領域上にも形成されたことを特徴とする請求項3記載の炭化珪素半導体装置。 - ショットキーバリアダイオードに順方向電流を流すための電流源と、
前記電流源によって電流を流している間に前記ショットキーバリアダイオードのアノードとカソードとの間の電圧を測定するための電圧計と、
前記電流源が定電流を流している間に前記電圧計で測定された測定電圧が、予め設定された設定電圧を所定時間下回ったときに、炭化珪素半導体素子の動作を停止させる制御部と、
を備えたことを特徴とする請求項1ないし請求項4のいずれか1項に記載の炭化珪素半導体装置。 - 設定電圧は、アノードとカソードとの間の電圧とショットキーバリアダイオードを流れる電流との関係に基づいて設定されることを特徴とする請求項5記載の炭化珪素半導体装置。
- n型の炭化珪素基板と前記炭化珪素基板の一方の面上に形成されたn型の炭化珪素ドリフト層とを有する炭化珪素エピタキシャル基板と、
前記炭化珪素エピタキシャル基板に形成された炭化珪素半導体素子と、
前記炭化珪素エピタキシャル基板に形成され、前記炭化珪素半導体素子の温度を測定するためのショットキーバリアダイオードと、
を備えた炭化珪素半導体装置の製造方法であって、
前記ショットキーバリアダイオードを形成するために、
前記炭化珪素ドリフト層の表層部のn型のカソード領域の周囲を前記炭化珪素ドリフト層内で取り囲むようにp型の第1ウェル領域を形成する工程と、
前記炭化珪素ドリフト層の表層部で、かつ、前記第1ウェルによって囲まれた領域内に、前記カソード領域と接するように、前記カソード領域よりも高濃度のn型のカソードコンタクト領域を形成する工程と、
前記カソードコンタクト領域上に第1オーミック電極を形成する工程と、
前記カソード領域上にショットキー電極となる第1チタン電極を形成する工程と、
を有する炭化珪素半導体装置の製造方法。 - 炭化珪素半導体素子を形成するために、
炭化珪素ドリフト層上にゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜上にゲート電極となるポリシリコン電極を形成する工程と、
前記ポリシリコン電極上に第2チタン電極を形成する工程と、を備え、
第1チタン電極を形成する工程と前記第2チタン電極を形成する工程を一度に行うことを特徴とする請求項7記載の炭化珪素半導体装置の製造方法。 - 炭化珪素半導体素子を形成するために、
カソード領域とほぼ同じ濃度のn型で炭化珪素ドリフト層の表層部のチャネル領域よりも深い部位に、前記チャネル領域と接するように、第1ウェル領域とほぼ同じ濃度のp型の第2ウェル領域を形成する工程と、
前記炭化珪素ドリフト層の表層部に前記チャネル領域から前記第2ウェル領域にまで達するように、カソードコンタクト領域とほぼ同じ濃度のn型のソース領域を形成する工程と、
前記ソース領域上に第2オーミック電極を形成する工程と、を備え、
ポリシリコン電極を形成する工程では、ゲート絶縁膜および前記チャネル領域を介して前記第2ウェル領域上に前記ポリシリコン電極を形成し、
前記第1ウェル領域を形成する工程と前記第2ウェル領域を形成する工程を一度に行い、
前記カソードコンタクト領域を形成する工程と前記ソース領域を形成する工程を一度に行い、
第1オーミック電極を形成する工程と前記第2オーミック電極を形成する工程を一度に行うことを特徴とする請求項8記載の炭化珪素半導体装置の製造方法。 - 第1ウェル領域を形成する工程は、
炭化珪素ドリフト層のカソード領域およびカソードコンタクト領域よりも深い部位に低濃度領域を形成する工程と、前記炭化珪素ドリフト層の表層部に前記低濃度領域と接するように、前記低濃度領域よりも高濃度のp型のガード領域を形成する工程と、を有し、
ショットキーバリアダイオードを形成するために、
前記ガード領域上に第3オーミック電極を形成する工程を備え、
炭化珪素半導体素子を形成するために、
前記炭化珪素ドリフト層の表層部にソース領域および第2ウェル領域と接するように、前記ガード領域とほぼ同じ濃度のp型のウェルコンタクト領域を形成する工程を備え、
第2オーミック電極を形成する工程では、前記コンタクト領域上にも前記第2オーミック電極を形成し、
前記低濃度領域を形成する工程と第2ウェル領域を形成する工程を一度に行い、
前記ガード領域を形成する工程と前記ウェルコンタクト領域を形成する工程を一度に行い、
第1オーミック電極を形成する工程と前記第2オーミック電極を形成する工程と前記第3オーミック電極を形成する工程を一度に行うことを特徴とする請求項9記載の炭化珪素半導体装置の製造方法。
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014127487A (ja) * | 2012-12-25 | 2014-07-07 | Nissan Motor Co Ltd | 半導体装置及び半導体装置の製造方法 |
WO2016039073A1 (ja) * | 2014-09-08 | 2016-03-17 | 富士電機株式会社 | 半導体装置および半導体装置の製造方法 |
US9773936B2 (en) | 2013-06-04 | 2017-09-26 | Fuji Electric Co., Ltd. | Semiconductor device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6132032B2 (ja) * | 2013-12-12 | 2017-05-24 | 富士電機株式会社 | 半導体装置およびその製造方法 |
US10090360B2 (en) | 2015-02-13 | 2018-10-02 | Taiwan Semiconductor Manufacturing Co., Ltd. | Method of manufacturing a semiconductor structure including a plurality of trenches |
EP4170729A1 (en) * | 2021-10-22 | 2023-04-26 | Infineon Technologies AG | Semiconductor device with sense element |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06310725A (ja) * | 1993-04-21 | 1994-11-04 | Mitsubishi Electric Corp | 半導体装置およびその製造方法 |
JPH0818075A (ja) * | 1994-07-05 | 1996-01-19 | Nec Kansai Ltd | ショットキーバリヤダイオード及び半導体集積回路 |
JP2003068759A (ja) * | 2001-08-29 | 2003-03-07 | Denso Corp | 半導体装置およびその製造方法 |
JP2003188370A (ja) * | 2001-12-20 | 2003-07-04 | Sanyo Electric Co Ltd | 炭化珪素半導体素子 |
JP2005175357A (ja) * | 2003-12-15 | 2005-06-30 | Nissan Motor Co Ltd | 半導体装置とその製造方法 |
JP2005209710A (ja) * | 2004-01-20 | 2005-08-04 | Hitachi Ulsi Systems Co Ltd | 半導体集積回路装置の製造方法 |
JP2006093382A (ja) * | 2004-09-24 | 2006-04-06 | Hitachi Ltd | 半導体装置 |
JP2008103537A (ja) * | 2006-10-19 | 2008-05-01 | Renesas Technology Corp | 半導体装置およびその製造方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6855981B2 (en) | 2001-08-29 | 2005-02-15 | Denso Corporation | Silicon carbide power device having protective diode |
US20050012143A1 (en) | 2003-06-24 | 2005-01-20 | Hideaki Tanaka | Semiconductor device and method of manufacturing the same |
JP5297584B2 (ja) | 2005-10-14 | 2013-09-25 | 株式会社半導体エネルギー研究所 | 半導体装置、半導体装置を用いた温度センサー及び半導体装置の作製方法 |
-
2011
- 2011-05-18 WO PCT/JP2011/002773 patent/WO2012086099A1/ja active Application Filing
- 2011-05-18 JP JP2012549594A patent/JP5669863B2/ja active Active
- 2011-05-18 US US13/995,993 patent/US9111751B2/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06310725A (ja) * | 1993-04-21 | 1994-11-04 | Mitsubishi Electric Corp | 半導体装置およびその製造方法 |
JPH0818075A (ja) * | 1994-07-05 | 1996-01-19 | Nec Kansai Ltd | ショットキーバリヤダイオード及び半導体集積回路 |
JP2003068759A (ja) * | 2001-08-29 | 2003-03-07 | Denso Corp | 半導体装置およびその製造方法 |
JP2003188370A (ja) * | 2001-12-20 | 2003-07-04 | Sanyo Electric Co Ltd | 炭化珪素半導体素子 |
JP2005175357A (ja) * | 2003-12-15 | 2005-06-30 | Nissan Motor Co Ltd | 半導体装置とその製造方法 |
JP2005209710A (ja) * | 2004-01-20 | 2005-08-04 | Hitachi Ulsi Systems Co Ltd | 半導体集積回路装置の製造方法 |
JP2006093382A (ja) * | 2004-09-24 | 2006-04-06 | Hitachi Ltd | 半導体装置 |
JP2008103537A (ja) * | 2006-10-19 | 2008-05-01 | Renesas Technology Corp | 半導体装置およびその製造方法 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014127487A (ja) * | 2012-12-25 | 2014-07-07 | Nissan Motor Co Ltd | 半導体装置及び半導体装置の製造方法 |
US9773936B2 (en) | 2013-06-04 | 2017-09-26 | Fuji Electric Co., Ltd. | Semiconductor device |
WO2016039073A1 (ja) * | 2014-09-08 | 2016-03-17 | 富士電機株式会社 | 半導体装置および半導体装置の製造方法 |
JPWO2016039073A1 (ja) * | 2014-09-08 | 2017-04-27 | 富士電機株式会社 | 半導体装置および半導体装置の製造方法 |
US10396161B2 (en) | 2014-09-08 | 2019-08-27 | Fuji Electric Co., Ltd. | Semiconductor device and method of manufacturing semiconductor device |
US10692979B2 (en) | 2014-09-08 | 2020-06-23 | Fuji Electric Co., Ltd. | Method of manufacturing semiconductor device |
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