WO2014080820A1 - ショットキーバリアダイオードおよびその製造方法 - Google Patents
ショットキーバリアダイオードおよびその製造方法 Download PDFInfo
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- WO2014080820A1 WO2014080820A1 PCT/JP2013/080678 JP2013080678W WO2014080820A1 WO 2014080820 A1 WO2014080820 A1 WO 2014080820A1 JP 2013080678 W JP2013080678 W JP 2013080678W WO 2014080820 A1 WO2014080820 A1 WO 2014080820A1
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- H01—ELECTRIC ELEMENTS
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02538—Group 13/15 materials
- H01L21/0254—Nitrides
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28575—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising AIIIBV compounds
- H01L21/28581—Deposition of Schottky electrodes
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28575—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising AIIIBV compounds
- H01L21/28587—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising AIIIBV compounds characterised by the sectional shape, e.g. T, inverted T
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- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/0603—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
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- H01L29/0642—Isolation within the component, i.e. internal isolation
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/20—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only AIIIBV compounds
- H01L29/2003—Nitride compounds
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
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- H01L29/475—Schottky barrier electrodes on AIII-BV compounds
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66083—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by variation of the electric current supplied or the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched, e.g. two-terminal devices
- H01L29/66196—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by variation of the electric current supplied or the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched, e.g. two-terminal devices with an active layer made of a group 13/15 material
- H01L29/66204—Diodes
- H01L29/66212—Schottky diodes
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
- H01L29/861—Diodes
- H01L29/872—Schottky diodes
Definitions
- the present invention relates to a Schottky barrier diode capable of flowing a large current with a high breakdown voltage and a manufacturing method thereof.
- Patent Document 1 discloses a Schottky barrier diode using a group III nitride film grown on a silicon substrate.
- An SBD (Schottky barrier diode) disclosed in Japanese Patent Application Laid-Open No. 2006-156457 (Patent Document 1) has a group III nitride film used for SBD on a silicon substrate having a chemical composition different from that of group III nitride. Therefore, it is difficult to maintain a high breakdown voltage because the dislocation density of the film is as high as 1 ⁇ 10 8 cm ⁇ 2 or more.
- a group III nitride buffer film having low crystallinity is grown on the silicon substrate, and the group III nitride buffer film is formed on the group III nitride buffer film. It is necessary to grow a group nitride film.
- the group III nitride buffer film has a high resistance, it is difficult to use it for an SBD having a vertical structure capable of flowing a large current.
- An object of the present invention is to solve the above problems and provide a low-cost Schottky barrier diode capable of flowing a large current with a high breakdown voltage and a method for manufacturing the same.
- a first electrode, a group III nitride film, and an opening are sequentially arranged in one direction from the first main surface side to the second main surface side.
- the Schottky barrier diode includes an insulating film, a Schottky contact metal film, a bonding metal film, a conductive support substrate, and a second electrode.
- a part of the Schottky contact metal film can run on a part of the insulating film.
- the Schottky barrier diode according to this aspect of the present invention further includes a buried metal film disposed between the concave portion of the Schottky contact metal film that is present when the insulating film has an opening and the bonding metal film. be able to. Further, the diffusion barrier metal film may be further included between the Schottky contact metal film and the buried metal film and the bonding metal film.
- the Schottky barrier diode according to this aspect of the present invention may further include a diffusion prevention metal film disposed between the Schottky contact metal film and the junction metal film.
- the insulating film may further include a buried metal film disposed between the concave portion of the diffusion preventing metal film and the bonding metal film which are present due to the opening.
- the first electrode can be positioned on a part of the main surface of the group III nitride film.
- a group III nitride is formed on a base group III nitride film of a base composite substrate including a base support substrate and a base group III nitride film bonded to one main surface side of the base support substrate.
- a step of forming a nitride film; a step of forming an insulating film having an opening on the group III nitride film; and a Schottky contact metal film on the group III nitride film and the insulating film in the opening of the insulating film Forming a bonding substrate by bonding a conductive support substrate with a bonding metal film interposed on the Schottky contact metal film, removing the base composite substrate from the bonding substrate, and group III Forming a first electrode on the nitride film and forming a second electrode on the conductive support substrate.
- the Schottky contact in the step of forming the Schottky contact metal film, is so formed that a part of the Schottky contact metal film runs on a part of the insulating film.
- a metal film can be formed.
- the buried metal film on the recess of the Schottky contact metal film can be performed by bonding the conductive support substrate to the Schottky contact metal film and the buried metal film with the bonded metal film interposed therebetween. Furthermore, after the step of forming the buried metal film and before the step of obtaining the bonding substrate, the method further includes the step of forming a diffusion prevention metal film on the Schottky contact metal film and the buried metal film to obtain the bonding substrate. Can be performed by bonding a conductive support substrate with a bonding metal film interposed on the diffusion preventing metal film.
- the diffusion preventing metal on the Schottky contact metal film may further include the step of obtaining a bonded substrate by bonding the conductive support substrate with the bonded metal film interposed on the diffusion preventing metal film.
- the method further includes a step of forming a buried metal film on the concave portion of the diffusion preventing metal film, and the step of obtaining the bonding substrate is diffusion prevention. This can be performed by bonding a conductive support substrate with a bonding metal film interposed between the metal film and the embedded metal film.
- the first electrode can be further formed on a part of the main surface of the group III nitride film.
- the present invention it is possible to provide a low-cost Schottky barrier diode capable of flowing a large current with a high breakdown voltage and a method for manufacturing the same.
- an SBD Schottky barrier diode that is an embodiment of the present invention is sequentially arranged in one direction from the first main surface side to the second main surface side.
- the SBD of this embodiment includes a first electrode 72, a group III nitride film 20, an insulating film 30 having an opening, a Schottky contact metal film 40, a bonding metal film 60, a conductive support substrate 50, and a second Since the electrodes 75 are arranged in this order, a large current can flow with a high breakdown voltage.
- the Schottky contact metal film 40 rides on a part of the insulating film 30. .
- the Schottky contact metal film 40 is on the vicinity of the Schottky contact portion 40 a located on the group III nitride film 20 in the opening of the insulating film 30 and the periphery of the opening that is a part of the insulating film 30.
- an insulating contact portion 40b located in contact with the substrate.
- the width W of a part where a part of the Schottky contact metal film 40 rides on a part of the insulating film 30 (that is, the width W of the insulating contact part 40b of the Schottky contact metal film 40). ) Is necessary to ensure adhesion between a part of the Schottky contact metal film 40 riding on the part of the insulating film 30 and a part of the insulating film 30 and not to contribute to the current. From the viewpoint of not occupying a large area, it is preferably 1 ⁇ m or more and 100 ⁇ m or less, and more preferably 5 ⁇ m or more and 30 ⁇ m or less.
- the planar shape of the opening of the insulating film 30 and the shape of the main surface of the Schottky contact metal film 40 are not particularly limited, but the Schottky contact metal From the viewpoint of reducing the electric field concentration on the end of the Schottky contact portion 40a of the film 40 and increasing the area of the operation main surface, at least one of a polygon, a circle, and an ellipse having an apex portion is preferable.
- the apex portion is an arc-shaped square (FIG. 6)
- the apex portion is an arc-shaped rectangle (FIG. 7), a circle (FIG. 8), or the like.
- the plane size of the opening portion of the insulating film 30 allows the opening portion of the insulating film 30 to be stably manufactured, and the processing margin when chipping with the insulating contact portion 40b of the Schottky contact metal film 40 is reduced.
- the shortest distance or shortest diameter is preferably 50 ⁇ m or more, more preferably 200 ⁇ m or more, and the longest distance or longest diameter is preferably (chip width ⁇ 60) ⁇ m or less (chip) More preferably, the width is ⁇ 100) ⁇ m or less.
- the longest distance is preferably 1440 ⁇ m or less, and more preferably 1400 ⁇ m or less. Specific embodiments will be described below.
- the SBD according to the first embodiment of the present invention includes a first electrode 72, which is sequentially arranged in one direction from the first main surface side to the second main surface side, and III Group nitride film 20, insulating film 30 having an opening, Schottky contact metal film 40, bonding metal film 60, conductive support substrate 50, and second electrode 75 are included. Further, a part of the Schottky contact metal film 40 rides on a part of the insulating film 30. As described above, the SBD of the first embodiment can flow a large current with a high breakdown voltage.
- the first electrode 72 is not particularly limited, but from the viewpoint of obtaining a good electrical connection between the group III nitride film 20 and an external electrode (not shown), the Al layer and the group III nitride film 20 side An electrode structure including an Au layer is preferable.
- a four-layer structure of the group III nitride film 20 including a Ti layer, an Al layer, a Ti layer, and an Au layer is formed.
- the second electrode 75 is not particularly limited, but from the viewpoint of obtaining good electrical connection with the conductive support substrate 50 and the external electrode (not shown), the Ti layer from the conductive support substrate 50 side, A three-layer structure of a Pt layer and an Au layer was adopted.
- the group III nitride film 20 is not particularly limited, but preferably has a dislocation density of 1 ⁇ 10 6 cm ⁇ 2 or less from the viewpoint of increasing the breakdown voltage.
- the group III nitride film 20 having such a low dislocation density is For example, as shown in Embodiment 6 to be described later, on the base group III nitride film of the base composite substrate including the base support substrate and the base group III nitride film bonded to one main surface side of the base support substrate. It is obtained by growing.
- the group III nitride film 20 has a group III nitride film for the purpose of forming a Schottky junction with the Schottky contact metal film 40 and simultaneously forming an ohmic junction with the first electrode 72.
- the n + -III nitride layer 21 having a relatively high donor concentration is formed on the first electrode 72 side of 20, and the n-III nitride layer 22 having a relatively low donor concentration is formed on the opposite side. It is preferable.
- the insulating film 30 having an opening is not particularly limited, but an SiO 2 film, an Si 3 N 4 film, or the like is preferable from the viewpoint of improving the insulating property of the insulating film 30 that is a non-opening.
- the Schottky contact metal film 40 is not particularly limited as long as the Schottky contact metal film 40 is a metal film that forms a Schottky contact with the group III nitride film 20, but the metal work function forming the metal film and the group III nitride film are formed. Ni / Au film, Ti / Au film, Pt / Au film, etc. are preferable from the viewpoint of making the difference between the group III nitride and the Fermi level appropriate.
- the bonding metal film 60 is not particularly limited, but preferably includes an Au—Sn alloy layer from the viewpoint of enhancing bonding properties with the Schottky contact metal film 40 and a buried metal film and a diffusion prevention metal film described later. Further, the bonding metal film 60 is formed between the Au—Sn alloy layer of the bonding metal film 60 and the conductive support substrate 50 from the viewpoint of preventing the diffusion of Sn from the Au—Sn alloy layer to the conductive support substrate 50. It is preferable to have three layers of a Ni layer, a Pt layer, and an Au layer arranged in this order from the conductive support substrate 50 side.
- the conductive support substrate 50 is not particularly limited, but is preferably a silicon (Si) substrate, a germanium (Ge) substrate, a silicon carbide (SiC) substrate, or the like from the viewpoint of high conductivity, and also has high thermal conductivity.
- a copper (Cu) substrate, a molybdenum (Mo) substrate, a tungsten (W) substrate, a copper-tungsten (Cu—W) alloy substrate and the like are also preferable.
- the Schottky contact metal film 40 is disposed on the insulating film 30 having an opening disposed on the group III nitride film 20 and a part of the Schottky contact metal film 40.
- the Schottky contact portion 40 a located in contact with the group III nitride film 20 in the opening of the insulating film 30 in the Schottky contact metal film 40 is insulated. It is recessed compared to the insulating contact portion 40 b located on and in contact with the film 30.
- the concave portion of the Schottky contact metal film 40 is filled with the bonding metal film 60.
- the concave portion of the Schottky contact metal film 40 is completely filled with the bonding metal film 60.
- the SBD according to the second embodiment of the present invention includes a first electrode 72, which is sequentially arranged in one direction from the first main surface side to the second main surface side, and III Group nitride film 20, insulating film 30 having an opening, Schottky contact metal film 40, buried metal film 80, bonding metal film 60, conductive support substrate 50, second electrode 75, including. Further, a part of the Schottky contact metal film 40 rides on a part of the insulating film 30.
- the SBD of the second embodiment is the same as the SBD of the first embodiment, in which the embedded insulating film 30 is disposed between the concave portion of the Schottky contact metal film 40 and the bonding metal film 60 that are present due to the opening.
- a metal film 80 is further included.
- the SBD of the second embodiment can pass a large current with a high withstand voltage, similar to the SBD of the first embodiment.
- the second electrode 75 includes the first electrode 72, the group III nitride film 20, the insulating film 30 having an opening, the Schottky contact metal film 40, the bonding metal film 60, and the conductive support substrate 50 in the SBD of the first embodiment. , And the second electrode 75, respectively.
- the Schottky contact metal film 40 is disposed on the insulating film 30 having an opening disposed on the group III nitride film 20 and a part of the Schottky contact metal film 40.
- the Schottky contact portion 40 a located in contact with the group III nitride film 20 in the opening of the insulating film 30 in the Schottky contact metal film 40 is insulated. Since it is recessed as compared with the insulating contact portion 40 b located on and in contact with the film 30, when the opening of the insulating film 30 is large, a gap is generated between the recess of the Schottky contact metal film 40 and the bonding metal film 60.
- a buried metal film 80 is disposed between the concave portion of the Schottky contact metal film 40 and the bonding metal film 60, and the gap between the concave portion of the Schottky contact metal film 40 and the bonding metal film 60 is completely buried with the buried metal film 80. Therefore, it is possible to prevent the generation of voids between them. Thereby, the on-resistance of the SBD, the breakdown voltage, the appearance yield such as the presence or absence of peeling of the group III nitride film 20 and the like can be improved.
- the embedded metal film 80 is not particularly limited, but from the viewpoint of having a work function close to that of the Schottky contact metal film 40, the embedded metal film 80 preferably has a two-layer structure of an Ni layer and an Au layer from the Schottky contact metal film 40 side.
- the SBD according to the third embodiment of the present invention includes a first electrode 72, which is sequentially arranged in one direction from the first main surface side to the second main surface side, and III Group nitride film 20, insulating film 30 having an opening, Schottky contact metal film 40, buried metal film 80, diffusion prevention metal film 90, bonding metal film 60, conductive support substrate 50, A second electrode 75. Further, a part of the Schottky contact metal film 40 rides on a part of the insulating film 30. That is, the SBD of the third embodiment further includes the diffusion prevention metal film 90 disposed between the Schottky contact metal film 40 and the buried metal film 80 and the bonding metal film 60 in the SBD of the second embodiment.
- the SBD of the third embodiment can flow a large current with a high breakdown voltage like the SBD of the first embodiment, and is bonded to the concave portion of the Schottky contact metal film 40 by the embedded metal film 80, similar to the SBD of the second embodiment. Since the gap between the metal film 60 and the metal film 60 can be completely prevented from being generated, the on-resistance of the SBD, the breakdown voltage, the appearance yield such as the presence or absence of peeling of the group III nitride film 20, etc. Can improve.
- the second electrode 75 includes the first electrode 72, the group III nitride film 20, the insulating film 30 having an opening, the Schottky contact metal film 40, the bonding metal film 60, and the conductive support substrate 50 in the SBD of the first embodiment.
- the second electrode 75 respectively.
- the buried metal film 80 in the SBD of the third embodiment is the same as the buried metal film 80 in the SBD of the second embodiment.
- the diffusion preventing metal film 90 is disposed between the Schottky contact metal film 40 and the buried metal film 80 and the bonding metal film 60, the Schottky contact metal from the bonding metal film 60 is used. Since diffusion of metal atoms in the bonding metal film 60 to the film 40 and the buried metal film 80 can be prevented, the forward threshold voltage, on-resistance, breakdown voltage, etc. of the SBD are improved.
- the diffusion preventing metal film 90 is not particularly limited.
- the bonding metal film 60 includes an Au—Sn alloy layer
- the Schottky contact metal film 40 is used to prevent Sn from diffusing from the Au—Sn alloy layer.
- the SBD according to the fourth embodiment of the present invention includes a first electrode 72, which is sequentially arranged in one direction from the first main surface side to the second main surface side, and III Group nitride film 20, insulating film 30 having an opening, Schottky contact metal film 40, diffusion prevention metal film 90, bonding metal film 60, conductive support substrate 50, second electrode 75, ,including. Further, a part of the Schottky contact metal film 40 rides on a part of the insulating film 30. That is, the SBD of the fourth embodiment further includes the diffusion preventing metal film 90 disposed between the Schottky contact metal film 40 and the bonding metal film 60 in the SBD of the first embodiment.
- the SBD of the fourth embodiment can flow a large current with a high breakdown voltage.
- the second electrode 75 includes the first electrode 72, the group III nitride film 20, the insulating film 30 having an opening, the Schottky contact metal film 40, the bonding metal film 60, and the conductive support substrate 50 in the SBD of the first embodiment. , And the second electrode 75, respectively.
- the diffusion preventing metal film 90 is disposed between the Schottky contact metal film 40 and the bonding metal film 60, the bonding from the bonding metal film 60 to the Schottky contact metal film 40 is performed. Since diffusion of metal atoms in the metal film 60 can be prevented, the SBD forward threshold voltage, on-resistance, breakdown voltage, and the like are improved.
- the diffusion prevention metal film 90 in the SBD of the fourth embodiment is the same as the diffusion prevention metal film 90 in the SBD of the third embodiment.
- the insulating film 30 having an opening is disposed on the group III nitride film 20
- the Schottky contact metal film 40 is disposed on the insulating film 30 having the opening, and the Schottky contact metal film is formed.
- An anti-diffusion metal film 90 is disposed on 40.
- a part of the Schottky contact metal film 40 rides on a part of the insulating film 30. Therefore, the Schottky contact portion 40 a located in contact with the group III nitride film 20 in the opening of the insulating film 30 in the Schottky contact metal film 40 becomes the insulating contact portion 40 b located in contact with the insulating film 30.
- the portion of the diffusion preventing metal film 90 formed on the concave portion of the Schottky contact metal film 40 is concave as compared with the portion formed on the portion other than the concave portion.
- the concave portion of the diffusion preventing metal film 90 is filled with the bonding metal film 60.
- the concave portion of the diffusion preventing metal film 90 is completely filled with the bonding metal film 60.
- the SBD according to the fifth embodiment of the present invention includes a first electrode 72, which is sequentially arranged in one direction from the first main surface side to the second main surface side, and III Group nitride film 20, insulating film 30 having an opening, Schottky contact metal film 40, diffusion preventing metal film 90, buried metal film 80, bonding metal film 60, conductive support substrate 50, A second electrode 75. Further, a part of the Schottky contact metal film 40 rides on a part of the insulating film 30.
- the SBD of the fifth embodiment is the same as the SBD of the fourth embodiment in that the embedded metal disposed between the concave portion of the diffusion preventing metal film 90 and the bonding metal film 60 that are present when the insulating film 30 has the opening. Further included is a membrane 80.
- the SBD of the fifth embodiment can flow a large current with a high breakdown voltage as in the SBD of the fourth embodiment, and the metal atoms in the bonding metal film 60 from the bonding metal film 60 to the Schottky contact metal film 40 Since diffusion can be prevented, the forward threshold voltage, on-resistance, breakdown voltage, etc. of the SBD are improved.
- the second electrode 75 includes the first electrode 72, the group III nitride film 20, the insulating film 30 having an opening, the Schottky contact metal film 40, the bonding metal film 60, and the conductive support substrate 50 in the SBD of the first embodiment.
- the second electrode 75 respectively.
- the diffusion preventing metal film 90 in the SBD of the fifth embodiment is the same as the diffusion preventing metal film 90 in the SBD of the fourth embodiment.
- the insulating film 30 having an opening is disposed on the group III nitride film 20
- the Schottky contact metal film 40 is disposed on the insulating film 30 having the opening
- the Schottky contact metal film is formed.
- a diffusion preventing metal film 90 is disposed on the semiconductor layer 40, and a part of the Schottky contact metal film 40 runs on a part of the insulating film 30. Therefore, the Schottky contact portion 40 a located in contact with the group III nitride film 20 in the opening of the insulating film 30 in the Schottky contact metal film 40 becomes the insulating contact portion 40 b located in contact with the insulating film 30.
- the portion of the diffusion preventing metal film 90 formed on the concave portion of the Schottky contact metal film 40 is concave as compared with the portion formed on the portion other than the concave portion. For this reason, when the opening of the insulating film 30 is large, a gap may be generated between the concave portion of the diffusion preventing metal film 90 and the bonding metal film 60. Therefore, by disposing the buried metal film 80 between the concave portion of the diffusion preventing metal film 90 and the bonding metal film 60, the gap between the concave portion of the diffusion preventing metal film 90 and the bonding metal film 60 is buried by the buried metal film 80.
- the buried metal film 80 in the SBD of the fifth embodiment is the same as the buried metal film 80 in the SBD of the second embodiment.
- the first electrode 72 is the main group III nitride film 20 from the viewpoint of facilitating alignment during chip formation. It is preferable that the 1st electrode 72 is patterned so that it may be located on a part of surface. When the first electrode 72 is formed on the entire surface of the group III nitride film 20, the arrangement of the Schottky contact metal film 40 becomes invisible and alignment during chip formation becomes difficult.
- a manufacturing method of an SBD (Schottky barrier diode) which is another embodiment of the present invention is a base support substrate 11 and a base bonded to one main surface side of the base support substrate 11.
- a step of forming a group III nitride film 20 on the base group III nitride film 13 of the base composite substrate 10 including the group III nitride film 13 (FIG. 9 to FIG. 13A), and group III nitride Step of forming insulating film 30 having an opening on material film 20 (FIG. 9 to FIG.
- the step of forming the Schottky contact metal film 40 (FIG. 9 to FIG. 13C) and the conductive support substrate 50 are bonded on the Schottky contact metal film 40 with the bonding metal film 60 interposed therebetween.
- the manufacturing method of the SBD of this embodiment can manufacture a Schottky barrier diode capable of flowing a large current with a high breakdown voltage at a low cost by including the above-described steps.
- a part of the Schottky contact metal film 40 is formed. It is preferable to form the Schottky contact metal film 40 so as to run on a part of the insulating film 30. At this time, the Schottky contact metal film 40 is on the vicinity of the Schottky contact portion 40 a located on the group III nitride film 20 in the opening of the insulating film 30 and the periphery of the opening that is a part of the insulating film 30. And an insulating contact portion 40b located in contact with the substrate.
- the SBD manufacturing method according to the sixth embodiment of the present invention is a method for manufacturing the SBD according to the first embodiment, and is bonded to one main surface side of the base support substrate 11 and the base support substrate 11.
- the manufacturing method of the SBD of the sixth embodiment includes the above-described steps, whereby a Schottky barrier diode that can flow a large current with a high breakdown voltage can be manufactured at a low cost.
- the base composite substrate 10 used in the step of forming the group III nitride film 20 on the base group III nitride film 13 of the base composite substrate 10 can be manufactured at a low cost. Since the base III nitride film 13 is bonded to one main surface side of the support substrate 11, the base composite substrate 10 is a low cost, and the dislocation density is low on the base III nitride film 13. A highly reliable group III nitride film can be grown.
- the step of preparing the base composite substrate 10 is not particularly limited, but the base group III nitride has a low dislocation density and high crystallinity on the one main surface 11 m side of the base support substrate 11.
- a sub-process for forming the base bonding film 12a on the main surface 11m of the base support substrate 11, and the main group III nitride film base material substrate 13D
- Sub-step of forming base bonding film 12b on surface 13n and forming ion implantation region 13i at a predetermined depth from main surface 13n of base group III nitride film base material substrate 13D (FIG. 14B)
- a sub-process (FIG. 14A) for forming the base bonding film 12a on the main surface 11m of the base support substrate 11, and the main group III nitride film base material substrate 13D
- the base support substrate 11 of the base composite substrate 10 is not particularly limited. However, the group III nitride film 20 having a low dislocation density and high crystallinity is cracked on the base group III nitride film 13 of the base composite substrate 10. From the viewpoint of growth without any problem, the thermal expansion coefficient of the underlying support substrate 11 is the same as the thermal expansion coefficient of the underlying group III nitride film 13 and the thermal expansion coefficient of the group III nitride film 20, or the absolute difference between the thermal expansion coefficients. The value is preferably 2 ⁇ 10 ⁇ 6 K ⁇ 1 or less. Specifically, the underlying support substrate is preferably a molybdenum substrate, a mullite (Al 2 O 3 —SiO 2 ) substrate, an yttria-stabilized zirconia-mullite substrate, or the like.
- the method for forming the group III nitride film 20 on the base group III nitride film 13 of the base composite substrate 10 is not particularly limited. However, the viewpoint of epitaxially growing the group III nitride film 20 having a low dislocation density and high crystallinity. Therefore, HVPE (hydride vapor phase epitaxy) method, MOCVD (metal organic chemical vapor deposition) method, MBE (molecular beam vapor phase epitaxy) method and the like are preferable.
- HVPE hydrogen vapor phase epitaxy
- MOCVD metal organic chemical vapor deposition
- MBE molecular beam vapor phase epitaxy
- the step of forming insulating film 30 having an opening on group III nitride film 20 is not particularly limited, but the sub-step of forming insulating film 30 includes insulating film 30. It is preferable to include a sub-process for forming the opening.
- a method for forming the insulating film 30 is not particularly limited, and a plasma CVD (chemical vapor deposition) method, a sputtering method, or the like can be applied.
- a method for forming the opening in the insulating film 30 is not particularly limited, and a method of etching the insulating film 30 using a resist mask (not shown) formed by a photolithography method can be applied.
- Schottky contact metal film 40 is formed.
- the method of forming is not particularly limited, and a resist mask (not shown) is formed by photolithography, and a metal film composed of a plurality of layers by EB (electron beam) vapor deposition, resistance heating, sputtering, etc.
- EB electron beam
- the Schottky contact metal film 40 thus obtained is formed on the group III nitride film 20 and the insulating film 30 in the opening of the insulating film 30, and a part of the Schottky contact metal film 40 is formed. Since the Schottky contact metal film 40 is formed so as to run on a part of the insulating film 30, the Schottky contact portion located on the group III nitride film 20 in the opening of the insulating film 30 in the Schottky contact metal film 40. 40a is recessed compared to the insulating contact portion 40b located on and in contact with the insulating film 30.
- a sub-process for forming the bonding metal film 60 on the conductive support substrate 50 by an EB vapor deposition method, a resistance heating method, a sputtering method, or the like, and a Schottky using a wafer bonder It is preferable to include a sub-step of bonding by bonding the contact metal film 40 and the bonding metal film 60 together.
- the concave portion of the Schottky contact metal film 40 is filled with the bonding metal film 60.
- the concave portion of the Schottky contact metal film 40 is completely filled with the bonding metal film 60.
- the process of removing the base composite substrate 10 from the joint substrate 100 is not particularly limited.
- the base support substrate 11, the base joint film 12 and the base III constituting the base composite substrate 10 are not limited. This is done by removing group nitride film 13.
- the method of removing the base support substrate 11, the base bonding film 12, and the base group III nitride film 13 differs depending on the types of materials constituting them.
- the base support substrate 11 is removed by etching with nitric acid in the case of a molybdenum substrate, or by etching with hydrofluoric acid in the case of a mullite substrate or a yttria stabilized zirconia-mullite substrate.
- Removal of the base bonding film 12 is performed by etching with hydrofluoric acid or the like in the case of a SiO 2 film or a Si 3 N 4 film.
- the removal of the base group III nitride film 13 is performed by ICP (inductive coupling type) -RIE (reactive ion etching) using chlorine gas as an etching gas.
- the first electrode 72 is formed.
- the method of forming the metal film There is no particular limitation on the method of forming the metal film.
- a metal film composed of a plurality of layers is formed by EB vapor deposition, resistance heating, sputtering, or the like using a resist mask (not shown) formed by photolithography. And then annealing.
- the first electrode 72 is formed by patterning so as to be located on a part of the main surface of the group III nitride film 20.
- the method of forming the second electrode 75 is not particularly limited.
- the second electrode 75 is formed by annealing after forming a metal film having a plurality of layers by EB vapor deposition, resistance heating, sputtering, or the like.
- the SBD of the first embodiment can be obtained by making the deposited film substrate obtained by the above process into chips.
- the SBD manufacturing method according to the seventh embodiment of the present invention is a method for manufacturing the SBD according to the second embodiment, and is bonded to one main surface side of the base support substrate 11 and the base support substrate 11.
- Forming a group III nitride film 20 on the base group III nitride film 13 of the base composite substrate 10 including the base group III nitride film 13 formed (FIG. 10A), and group III nitride A step of forming an insulating film 30 having an opening on the film 20 (FIG.
- a step of forming the first electrode 72 on the group III nitride film 20 and the second electrode 75 on the conductive support substrate 50 (FIG. 10G), including.
- the Schottky contact metal film 40 is formed so that a part of the Schottky contact metal film runs on a part of the insulating film. To do.
- the SBD manufacturing method of the seventh embodiment is the same as the SBD manufacturing method of the sixth embodiment, after the step of forming the Schottky contact metal film 40 and before the step of obtaining the bonding substrate 100.
- the step of obtaining the bonding substrate 100 further includes the step of forming the buried metal film 80 on the concave portion 40, and the step of obtaining the bonding substrate 100 includes the bonding metal film 60 interposed on the Schottky contact metal film 40 and the buried metal film 80. This is performed by bonding the conductive support substrate 50.
- the manufacturing method of the SBD of the seventh embodiment includes the above-described steps, and manufactures a Schottky barrier diode that can flow a large current with a high breakdown voltage at a low cost, similar to the manufacturing method of the SBD of the sixth embodiment. be able to.
- the Schottky contact metal film 40 disposed on the insulating film 30 having the opening disposed on the group III nitride film 20 is the Schottky contact metal film 40.
- the Schottky contact portion 40a located in contact with the group III nitride film 20 in the opening of the insulating film 30 is recessed as compared with the insulating contact portion 40b located in contact with the insulating film 30, so that the shot is performed as it is.
- the step of disposing the buried metal film 80 between the recess of the Schottky contact metal film 40 and the bonding metal film 60 causes the buried metal film 80 to form the recess of the Schottky contact metal film 40 and the bonding metal film 60.
- FIG. 10A shows a step of forming a group III nitride film 20 on the base group III nitride film 13 of the base composite substrate 10 in the SBD manufacturing method of the seventh embodiment (FIG. 10A), opening on the group III nitride film 20 Forming the insulating film 30 having a portion (FIG. 10B), and forming the Schottky contact metal film 40 on the group III nitride film 20 and the insulating film 30 in the opening of the insulating film 30 (FIG. FIG. 10C shows a step of forming a group III nitride film 20 on the base group III nitride film 13 of the base composite substrate 10 in the SBD manufacturing method of Embodiment 6 (FIG.
- Step of forming insulating film 30 having an opening on group III nitride film 20 (FIG. 9B), and Schottky on group III nitride film 20 and insulating film 30 in the opening of insulating film 30 Contour Forming a preparative metal film 40 is the same as that (FIG. 9 (C)).
- the method for forming the buried metal film 80 is not particularly limited, and is a photolithography method.
- a method of forming a resist mask (not shown), forming a metal film of a plurality of layers by EB (electron beam) vapor deposition, resistance heating, sputtering, or the like from the resist mask (not shown) and then lifting off can be applied.
- the step of forming the buried metal film 80 on the concave portion of the Schottky contact metal film 40 reduces or flattens the concave portion of the Schottky contact metal film 40.
- the bonding metal film 60 is bonded without a gap.
- the step of bonding the conductive support substrate 50 via the bonding metal film 60 is the same as the step of bonding the conductive support substrate 50 via the bonding metal film 60 in the SBD manufacturing method of the sixth embodiment. It is preferable to include similar sub-steps.
- the step of forming the second electrode 75 on the substrate 50 is a step of removing the base composite substrate 10 from the bonding substrate 100 in the SBD manufacturing method of Embodiment 6 (FIG. 9E). ), And the step of forming the first electrode 72 on the group III nitride film 20 and the second electrode 75 on the conductive support substrate 50 (FIG. 9F).
- the SBD manufacturing method according to the eighth embodiment of the present invention is a method for manufacturing the SBD according to the third embodiment, and is bonded to one main surface side of the base support substrate 11 and the base support substrate 11.
- a step of forming the film 40 (FIG. 11C), a step of forming the buried metal film 80 on the concave portion of the Schottky contact metal film 40 (FIG. 11D), and the Schottky contact metal film 40 And buried metal film 8
- a bonding substrate is formed by bonding a conductive support substrate 50 on the diffusion preventing metal film 90 with a bonding metal film 60 interposed on the diffusion preventing metal film 90 (FIG. 11E).
- 100 (FIG. 11F), a step of removing the base composite substrate 10 from the bonded substrate 100 (FIG.
- a first electrode 72 is formed on the group III nitride film 20.
- a step of forming the second electrode 75 on the conductive support substrate 50 (FIG. 11H).
- the Schottky contact metal film 40 in the step of forming the Schottky contact metal film 40 (FIG. 11C), the Schottky contact metal film 40 so that a part of the Schottky contact metal film 40 rides on a part of the insulating film 30.
- the SBD manufacturing method of the eighth embodiment is the same as the SBD manufacturing method of the seventh embodiment on the Schottky contact metal film 40 after the step of forming the buried metal film 80 and before the step of obtaining the bonding substrate 100.
- a step of forming the diffusion preventing metal film 90 on the buried metal film 80, and the step of obtaining the bonding substrate 100 is performed by interposing the bonding metal film 60 on the diffusion preventing metal film 90. 50 is joined.
- the manufacturing method of the SBD of the eighth embodiment includes the above-described steps, and manufactures a Schottky barrier diode that can flow a large current with a high breakdown voltage at a low cost, similar to the manufacturing method of the SBD of the seventh embodiment.
- the gap between the concave portion of the Schottky contact metal film 40 and the bonding metal film 60 is completely filled with the buried metal film 80, it is possible to prevent the generation of voids therebetween.
- the appearance yield such as the presence or absence of peeling of the group III nitride film 20 can be improved.
- the step of forming the diffusion prevention metal film 90 on the Schottky contact metal film 40 and the buried metal film 80, and the bonding metal film 60 on the diffusion prevention metal film 90 are formed.
- the diffusion preventing metal film 90 is formed between the Schottky contact metal film 40 and the buried metal film 80 and the bonding metal film 60 by the step of obtaining the bonding substrate 100 by bonding the conductive support substrate 50 with the interposition. Therefore, diffusion of metal atoms in the junction metal film 60 from the junction metal film 60 to the Schottky contact metal film 40 and the buried metal film 80 can be prevented, so that the forward threshold voltage, on-resistance, breakdown voltage, etc. of the SBD are increased. Improve.
- a step of forming a group III nitride film 20 on the base group III nitride film 13 of the base composite substrate 10 in the SBD manufacturing method of the eighth embodiment (FIG. 11A), opening on the group III nitride film 20 Forming the insulating film 30 having a portion (FIG. 11B), forming the Schottky contact metal film 40 on the group III nitride film 20 and the insulating film 30 in the opening of the insulating film 30 (FIG. 11).
- 11 (C)) and the step of forming the buried metal film 80 on the concave portion of the Schottky contact metal film 40 (FIG. 11D) are performed on the underlying composite substrate 10 in the SBD manufacturing method of Embodiment 7, respectively.
- a step of forming a group III nitride film 20 on the underlying group III nitride film 13 (FIG. 10A), a step of forming an insulating film 30 having an opening on the group III nitride film 20 (FIG. 10A).
- B ) A step of forming Schottky contact metal film 40 on group III nitride film 20 and insulating film 30 in the opening of insulating film 30 (FIG. 10C), and on the recess of Schottky contact metal film 40
- the process is similar to the step of forming the buried metal film 80 (FIG. 10D).
- the method for forming diffusion preventing metal film 90 is not particularly limited.
- a method of forming a metal film composed of a plurality of layers by EB (electron beam) vapor deposition, resistance heating, sputtering, or the like can be applied.
- the bonding metal film 60 is formed.
- the method of bonding the conductive support substrate 50 by interposing is the same as the step of bonding the conductive support substrate 50 by interposing the bonding metal film 60 in the SBD manufacturing method of the sixth embodiment.
- the step of forming the second electrode 75 on the substrate 50 (FIG. 11H) is a step of removing the base composite substrate 10 from the bonding substrate 100 in the SBD manufacturing method of Embodiment 6 (FIG. 9E). ), And the step of forming the first electrode 72 on the group III nitride film 20 and the second electrode 75 on the conductive support substrate 50 (FIG. 9F).
- the SBD manufacturing method according to the ninth embodiment of the present invention is a method for manufacturing the SBD according to the fourth embodiment, and is bonded to one main surface side of the base support substrate 11 and the base support substrate 11.
- the SBD manufacturing method of the ninth embodiment is the same as the SBD manufacturing method of the sixth embodiment, after the step of forming the Schottky contact metal film 40 and before the step of obtaining the bonding substrate 100.
- the step of obtaining the bonding substrate 100 further includes the step of forming the diffusion preventing metal film 90 on the substrate 40, and the step of obtaining the bonding substrate 100 is to bond the conductive support substrate 50 to the diffusion preventing metal film 90 with the bonding metal film 60 interposed therebetween. Is to be performed.
- the manufacturing method of the SBD of the ninth embodiment includes the above-described steps, thereby manufacturing a Schottky barrier diode that can flow a large current with a high breakdown voltage at a low cost, similar to the manufacturing method of the SBD of the sixth embodiment. be able to.
- the step of forming the diffusion prevention metal film 90 on the Schottky contact metal film 40 and the conductive support by interposing the bonding metal film 60 on the diffusion prevention metal film 90 are performed. Since the diffusion preventing metal film 90 is formed between the Schottky contact metal film 40 and the bonding metal film 60 by the step of obtaining the bonding substrate 100 by bonding the substrate 50, the Schottky from the bonding metal film 60 is obtained. Since diffusion of metal atoms in the bonding metal film 60 to the contact metal film 40 can be prevented, the SBD forward threshold voltage, on-resistance, breakdown voltage, and the like are improved.
- FIG. 12A shows a step of forming a group III nitride film 20 on the base group III nitride film 13 of the base composite substrate 10 in the SBD manufacturing method of Embodiment 9 (FIG. 12A), an opening on the group III nitride film 20 Forming the insulating film 30 having a portion (FIG. 12B), and forming the Schottky contact metal film 40 on the group III nitride film 20 and the insulating film 30 in the opening of the insulating film 30 (FIG. FIG. 12C shows a step of forming a group III nitride film 20 on the base group III nitride film 13 of the base composite substrate 10 in the SBD manufacturing method of Embodiment 6 (FIG.
- Step of forming insulating film 30 having an opening on group III nitride film 20 (FIG. 9B), and Schottky on group III nitride film 20 and insulating film 30 in the opening of insulating film 30 Contour Forming a preparative metal film 40 is the same as that (FIG. 9 (C)).
- the method of forming the diffusion prevention metal film 90 is the diffusion prevention metal film in the SBD of the eighth embodiment. This is similar to the method of forming 90.
- the diffusion preventing metal film 90 thus obtained has an insulating contact portion 40b in which the Schottky contact portion 40a formed on the group III nitride film 20 in the opening of the insulating film 30 is formed on the insulating film 30. Therefore, the portion of the diffusion prevention metal film 90 that is formed on the recess of the Schottky contact metal film 40 is recessed as compared with the other portions. It is out.
- the bonding metal film 60 is formed.
- the step of bonding the conductive support substrate 50 through the interposition includes the same sub-step as the step of bonding the conductive support substrate 50 through the bonding metal film 60 in the SBD manufacturing method of the sixth embodiment. Is preferred.
- the concave portion of the diffusion preventing metal film 90 is filled with the bonding metal film 60.
- the concave portion of the diffusion preventing metal film 90 is completely filled with the bonding metal film 60.
- the step of forming the second electrode 75 on the substrate 50 is a step of removing the base composite substrate 10 from the bonded substrate 100 in the SBD manufacturing method of Embodiment 6 (FIG. 9E).
- the step of forming the first electrode 72 on the group III nitride film 20 and the second electrode 75 on the conductive support substrate 50 (FIG. 9F).
- the SBD manufacturing method according to the tenth embodiment of the present invention is a method for manufacturing the SBD according to the fifth embodiment, and is bonded to one main surface side of the base support substrate 11 and the base support substrate 11.
- the first electrode 72 is formed on the group III nitride film 20, and the conductive support substrate 50 is formed. Forming a second electrode 75 (FIG. 13H).
- the Schottky contact metal film 40 is so formed that a part of the Schottky contact metal film 40 rides on a part of the insulating film 30. Form.
- the SBD manufacturing method according to the tenth embodiment is the same as the SBD manufacturing method according to the ninth embodiment, after the step of forming the diffusion preventing metal film 90 and before the step of obtaining the bonded substrate 100.
- the step of forming the buried metal film 80 on the concave portion further includes the step of obtaining the bonding substrate 100 by providing the bonding metal film 60 on the diffusion preventing metal film 90 and the buried metal film 80 to provide conductive support. This is performed by bonding the substrate 50.
- the manufacturing method of the SBD of the tenth embodiment includes the above-described steps, and manufactures a Schottky barrier diode that can flow a large current with a high breakdown voltage at a low cost, similar to the manufacturing method of the SBD of the ninth embodiment.
- the diffusion preventing metal film 90 is formed between the Schottky contact metal film 40 and the bonding metal film 60, the metal in the bonding metal film 60 from the bonding metal film 60 to the Schottky contact metal film 40. Since atom diffusion can be prevented, the forward threshold voltage, on-resistance, breakdown voltage, etc. of SBD are improved.
- the diffusion preventing metal film 90 has the Schottky contact portion 40 a formed on the group III nitride film 20 in the opening of the insulating film 30 formed on the insulating film 30. It is formed on the Schottky contact metal film 40 that is recessed compared to the insulated contact portion 40b. For this reason, the portion of the diffusion preventing metal film 90 formed on the concave portion of the Schottky contact metal film 40 is recessed as compared with the portion formed on the other portion.
- the gap between the concave portion of the diffusion preventing metal film 90 and the bonding metal film 60 is completely filled with the buried metal film 80, thereby generating voids therebetween. Therefore, it is possible to improve the on-resistance of the SBD, the breakdown voltage, the appearance yield such as the presence or absence of peeling of the group III nitride film 20, and the like.
- a step of forming a group III nitride film 20 on the base group III nitride film 13 of the base composite substrate 10 in the SBD manufacturing method of Embodiment 10 (FIG. 13A), opening on the group III nitride film 20 Forming the insulating film 30 having a portion (FIG. 13B), forming the Schottky contact metal film 40 on the group III nitride film 20 and the insulating film 30 in the opening of the insulating film 30 (FIG. 13).
- 13 (C)) and the step of forming the diffusion prevention metal film 90 on the Schottky contact metal film 40 are performed on the base III of the base composite substrate 10 in the SBD manufacturing method of Embodiment 9, respectively.
- Step of forming group III nitride film 20 on group nitride film 13 (FIG. 12A), step of forming insulating film 30 having an opening on group III nitride film 20 (FIG. 12B) ), Step of forming Schottky contact metal film 40 on group III nitride film 20 and insulating film 30 in the opening of edge film 30 (FIG. 12C), and diffusion preventing metal on Schottky contact metal film 40 This is similar to the step of forming the film 90 (FIG. 12D).
- the method of forming the buried metal film 80 is the same as the method of manufacturing the SBD according to the seventh embodiment. This is the same as the method for forming the metal film 80.
- the concave portion of the diffusion preventing metal film 90 is reduced or flattened.
- the bonding metal film 60 is bonded without a gap.
- the step of bonding the conductive support substrate 50 via the bonding metal film 60 is the same as the step of bonding the conductive support substrate 50 via the bonding metal film 60 in the SBD manufacturing method of the sixth embodiment. It is preferable to include similar sub-steps.
- a step of removing base composite substrate 10 from bonded substrate 100 in the SBD manufacturing method of Embodiment 10 (FIG. 13G), and first electrode 72 is formed on group III nitride film 20 to provide conductive support.
- the step of forming the second electrode 75 on the substrate 50 (FIG. 13H) is a step of removing the base composite substrate 10 from the bonding substrate 100 in the SBD manufacturing method of Embodiment 6 (FIG. 9E).
- the step of forming the first electrode 72 on the group III nitride film 20 and the second electrode 75 on the conductive support substrate 50 (FIG. 9F).
- the first electrode 72 is located on a part of the main surface of the group III nitride film 20.
- the method for patterning the first electrode 72 is not particularly limited, but a photolithography method or the like is preferable from the viewpoint of efficient patterning.
- Example 1 is an example corresponding to the manufacturing method of the SBD of the first embodiment and the SBD of the sixth embodiment.
- a base bonding film comprising a base support substrate 11 having a thickness of 450 ⁇ m and a SiO 2 film having a thickness of 400 nm disposed on one main surface thereof.
- the main surface of the underlying group III nitride film was a Ga atom plane that is a (0001) plane. As shown in FIG.
- the base composite substrate 10 is bonded to the base support substrate 11 and the base group III nitride film base material substrate 13D on which the ion implantation region is formed, with the base bonding film 12 interposed therebetween.
- the base group III nitride film base material substrate 13D is obtained by separating the base group III nitride film 13 and the base base group III nitride film base material substrate 30E in the ion implantation region 13i.
- the underlying group III nitride film 13 had a low dislocation density of 1 ⁇ 10 5 cm ⁇ 2 and high crystallinity.
- the base composite substrate 10 three types of base composite substrates each including the following three types of substrates were prepared as the base support substrate 11.
- the base support substrate 11 was three types of substrates: a molybdenum substrate, a mullite substrate, and a yttria stabilized zirconia-mullite substrate.
- the chemical composition of the mullite substrate was 64 mol% and 36 mol% for Al 2 O 3 and SiO 2 , respectively.
- the chemical composition of the yttria stabilized zirconia-mullite substrate is 30% by weight and 70% by weight for yttria stabilized zirconia and mullite, respectively, and the chemical composition of yttria stabilized zirconia is 10 mol% for Y 2 O 3 and ZrO 2 respectively.
- the chemical composition of mullite was 60 mol% and 40 mol% for Al 2 O 3 and SiO 2 , respectively.
- Each of these base support substrates 11 has a diameter of 2 inches (5.08 cm), a thickness of 450 ⁇ m, and a main surface having a roughness Ra (where roughness Ra is an arithmetic defined in JIS B0601: 2001).
- the average roughness Ra was precisely mirror-polished to less than 10 nm.
- the thermal expansion coefficients of the molybdenum substrate and the yttria-stabilized zirconia-mullite substrate were the same as those of GaN from room temperature (25 ° C.) to 1200 ° C.
- the thermal expansion coefficient of the mullite substrate was 80% of the thermal expansion coefficient of GaN from room temperature (25 ° C.) to 1200 ° C.
- n + having a donor concentration of 1 ⁇ m in thickness of 1.5 ⁇ 10 18 cm ⁇ 3 is formed as a group III nitride film 20 on the base group III nitride film 13 of the base composite substrate 10 by MOCVD.
- An n + -III nitride layer 21 composed of a -GaN layer, an n-III nitride layer 22 composed of an n-GaN layer having a donor concentration of 7 ⁇ m and a donor concentration of 5.5 ⁇ 10 15 cm ⁇ 3 Formed.
- the obtained group III nitride film 20 was not cracked, and the dislocation density was as low as 10 5 cm ⁇ 2 as measured by CL (cathode luminescence).
- a 500 nm-thickness is formed on group III nitride film 20 by plasma CVD using silane gas and ammonia gas as source gases.
- An insulating film 30 made of a Si 3 N 4 film was formed.
- annealing was performed at 600 ° C. for 3 minutes in a nitrogen atmosphere using an RTA (fast annealing furnace).
- buffered hydrofluoric acid a 50% by mass hydrofluoric acid aqueous solution and a 40% by mass ammonium fluoride aqueous solution in a mass ratio of 1: 5 is used.
- the insulating film 30 in the resist mask opening was removed by etching for 15 minutes. After etching, the resist mask was removed using acetone.
- an insulating film 30 having an arcuate rectangular opening having a planar shape of 200 ⁇ m ⁇ 5000 ⁇ m and a vertex radius of curvature of 50 ⁇ m was formed as a field plate.
- a resist mask is formed on the insulating film 30 having the opening by photolithography, and the group III nitride in the opening of the insulating film 30 is formed.
- a Ni layer having a thickness of 500 mm and an Au layer having a thickness of 3000 mm were sequentially formed by EB vapor deposition, and patterned by lifting off using acetone.
- an alloy was formed by annealing at 400 ° C. for 3 minutes in a nitrogen atmosphere using an RTA (fast annealing furnace), and a part of the Schottky contact metal film 40 ran over a part of the insulating film 30.
- a Schottky contact metal film 40 was formed.
- the width of the part of the Schottky contact metal film 40 overlying the part of the insulating film 30 (hereinafter referred to as the width of the insulating contact part 40b of the Schottky contact metal film 40) was 15 ⁇ m.
- a Si substrate having a thickness of 2 inches (5.08 cm) and a thickness of 320 ⁇ m was prepared as the conductive support substrate 50.
- This Si substrate had a resistivity of less than 0.001 ⁇ cm and was doped p-type.
- a 500 nm thick Ni layer, a 4000 mm thick Pt layer, and a 500 mm thick Au layer are formed as a bonding metal film 60 on the conductive support substrate 50 by EB vapor deposition.
- an Au—Sn layer (chemical composition was 70 mass% Au and 30 mass% Sn) was formed by resistance heating vapor deposition.
- the bonding substrate 100 was obtained by bonding the Au layer of the Schottky contact metal film 40 and the Au—Sn layer of the bonding metal film 60 using a wafer bonder.
- the bonding conditions were a vacuum atmosphere of less than 1 Pa, a temperature of 300 ° C., and a bonding time of 10 minutes. After joining, it was confirmed by an ultrasonic microscope that there were no defects (residual voids) on the joining surface.
- the base support substrate 11 was a molybdenum substrate
- a sapphire substrate (not shown) having a diameter of 3 inches (7.62 cm) and a thickness of 500 ⁇ m was prepared.
- the Si substrate side of the conductive support substrate 50 of the bonding substrate 100 was attached to the sapphire substrate with wax interposed, and the outer peripheral side surface was also protected with wax.
- a 35 mass% nitric acid aqueous solution was prepared.
- the bonding substrate 100 bonded to the sapphire substrate in an aqueous nitric acid solution stirred at 200 rpm for 40 minutes the molybdenum substrate which is the base support substrate was removed by etching.
- the obtained substrate was washed with hydrochloric acid and pure water.
- the SiO 2 film as the base bonding film 12 was removed by etching by dipping in buffered hydrofluoric acid for 10 minutes.
- the underlying GaN film as the underlying III-nitride film 13 was exposed.
- the mullite substrate which is the base support substrate 11 of the bonding substrate 100
- the mullite substrate was ground using a surface grinder to a thickness of 40 ⁇ m.
- a sapphire substrate (not shown) having a diameter of 3 inches (7.62 cm) and a thickness of 500 ⁇ m was prepared.
- the Si substrate side of the conductive support substrate 50 of the bonding substrate 100 was attached to the sapphire substrate with wax interposed, and the outer peripheral side surface was also protected with wax.
- a 50 mass% hydrofluoric acid aqueous solution was prepared.
- the SiO 2 film which is the base bonding film 12
- the SiO 2 film is removed by etching.
- a mullite substrate was lifted off.
- the underlying GaN film as the underlying III-nitride film 13 was exposed.
- the base support substrate 11 is a yttria-stabilized zirconia-mullite substrate
- the yttria-stabilized zirconia-mullite substrate which is the base support substrate 11 of the bonding substrate 100
- a sapphire substrate (not shown) having a diameter of 3 inches (7.62 cm) and a thickness of 500 ⁇ m was prepared.
- the Si substrate side of the conductive support substrate 50 of the bonding substrate 100 was attached to the sapphire substrate with wax interposed, and the outer peripheral side surface was also protected with wax.
- a 50 mass% hydrofluoric acid aqueous solution was prepared.
- the SiO 2 film as the underlying bonding film 12 is removed by etching, whereby the underlying support substrate 11 A mullite substrate was lifted off.
- the underlying GaN film as the underlying III-nitride film 13 was exposed.
- the underlying GaN film which is the underlying group III nitride film 13 exposed on the obtained substrate, was removed by ICP-RIE using chlorine gas as an etching gas.
- a resist mask is formed on the group III nitride film 20 of the obtained substrate by a photolithography method, and then Then, a 200 ⁇ m thick Ti layer, a 300 mm thick Al layer, a 200 mm thick Ti layer, and a 3000 ⁇ m thick Au layer are formed in this order by the EB vapor deposition method, and the planar shape is 300 ⁇ m ⁇ 5100 ⁇ m.
- a rectangular first electrode 72 was formed.
- the second layer is formed by sequentially forming a Ti layer having a thickness of 200 mm, a Pt layer having a thickness of 300 mm, and an Au layer having a thickness of 3000 mm on the conductive support substrate 50 of the obtained substrate by EB vapor deposition.
- the electrode 75 was formed.
- the first electrode 72 and the second electrode 75 were annealed at 250 ° C. for 3 minutes in a nitrogen atmosphere.
- the SBD obtained in this way is attached on the UV curable dicing tape with the first electrode 72 formed on the group III nitride film 20 facing down, and conductively matched to the chip pattern with a dicer.
- the Si substrate which is the conductive support substrate 50 was cut from the main surface to a depth of 300 ⁇ m.
- the cut portion was broken by a break device, whereby the remaining portion was separated and formed into an SBD chip having a main surface of 400 ⁇ m ⁇ 5200 ⁇ m.
- the withstand voltage against reverse bias was 600 V or more, and 5 A or more was successfully passed with a 1 mm 2 electrode pattern chip during forward bias operation.
- Example 2 is an example corresponding to the manufacturing method of the SBD of the second embodiment and the SBD of the seventh embodiment.
- group III nitridation is performed in the same manner as in Example 1. Formation of the material film 20, formation of the insulating film 30 having an arc-shaped square opening having a planar shape of 1000 ⁇ m ⁇ 1000 ⁇ m and a radius of curvature of the apex of 100 ⁇ m, and a group III nitride film in the opening of the insulating film 30 Further, the Schottky contact metal film 40 in which the width of the insulating contact portion 40b of the Schottky contact metal film 40 is 30 ⁇ m on a part of the insulating film was formed.
- a resist mask (not shown) is formed by photolithography on the concave portion of Schottky contact metal film 40, and EB (electron beam) deposition is performed thereon.
- EB electron beam
- the withstand voltage against reverse bias was 600 V or more, and 5 A or more was successfully passed with a 1 mm 2 electrode pattern chip during forward bias operation.
- Example 3 is an example corresponding to the manufacturing method of the SBD of the third embodiment and the SBD of the eighth embodiment.
- a Ni layer having a thickness of 500 mm and a thickness of 4000 mm are formed on the Schottky contact metal film 40 and the buried metal film 80 by EB (electron beam) evaporation.
- the diffusion preventing metal film 90 was formed by sequentially forming a Pt layer and an Au layer having a thickness of 500 mm.
- the withstand voltage against reverse bias was 600 V or more, and 5 A or more was successfully passed with a 1 mm 2 electrode pattern chip during forward bias operation.
- Example 4 is an example corresponding to the manufacturing method of the SBD of the fourth embodiment and the SBD of the ninth embodiment.
- group III nitridation is performed in the same manner as in Example 1. Formation of the material film 20, formation of the insulating film 30 having an arcuate rectangular opening having a planar shape of 200 ⁇ m ⁇ 5000 ⁇ m and a radius of curvature of the apex of 50 ⁇ m, and the group III nitride film in the opening of the insulating film 30 Further, the Schottky contact metal film 40 in which the width of the insulating contact portion 40b of the Schottky contact metal film 40 is 15 ⁇ m on a part of the insulating film was formed.
- an EB (electron beam) vapor deposition method is used to form a Ni layer having a thickness of 500 mm, a Pt layer having a thickness of 4000 mm, and a thickness.
- a diffusion preventing metal film 90 was formed by sequentially forming a 500-thick Au layer.
- the withstand voltage against reverse bias was 600 V or more, and 5 A or more was successfully passed with a 1 mm 2 electrode pattern chip during forward bias operation.
- Example 5 is an example corresponding to the manufacturing method of the SBD of the fifth embodiment and the SBD of the tenth embodiment.
- Example 4 Formation of Group III Nitride Film, Formation of Insulating Film with Opening, Formation of Schottky Contact Metal Film, and Formation of Diffusion Prevention Metal Film Referring to FIGS. 13A to 13D, Example 4 Similarly, formation of group III nitride film 20, formation of insulating film 30 having an arc-shaped square opening having a planar shape of 1000 ⁇ m ⁇ 1000 ⁇ m and a radius of curvature of the apex of 100 ⁇ m, in the opening of insulating film 30 Formation of the Schottky contact metal film 40 in which the width of the insulating contact portion 40b of the Schottky contact metal film 40 is 30 ⁇ m and the formation of the diffusion prevention metal film 90 on the group III nitride film and a part of the insulating film. I did it.
- a resist mask (not shown) is formed by photolithography on the concave portion of diffusion preventing metal film 90, and EB (electron beam) vapor deposition is performed thereon.
- EB electron beam
- bonding is performed in the same manner as in Example 1.
- the substrate 100 By forming the substrate 100, removing the base composite substrate 10 from the bonding substrate 100, forming the first electrode 72 and the second electrode 75, and further forming a chip, an SBD having a main surface of 1500 ⁇ m ⁇ 1500 ⁇ m I got a chip.
- the withstand voltage against reverse bias was 600 V or more, and 5 A or more was successfully passed with a 1 mm 2 electrode pattern chip during forward bias operation.
- Base composite substrate 11 Base support substrate, 11m, 13n Main surface, 12, 12a, 12b Base bonding film, 13 Base group III nitride film, 13D Base group III nitride film base material substrate, 13i Ion implantation region, 20 Group III nitride film, 21 n + -GaN layer, 22 n-GaN layer, 30 insulating film, 40 Schottky contact metal film, 40a Schottky contact part, 40b insulating contact part, 50 conductive support substrate, 60 junction metal Film, 72 first electrode, 75 second electrode, 80 buried metal film, 90 diffusion preventing metal film, 100 bonding substrate.
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Abstract
Description
図1~図5を参照して、本発明の一実施形態であるSBD(ショットキーバリアダイオード)は、第1の主面側から第2の主面側への一方向に順に配置されている、第1の電極72と、III族窒化物膜20と、開口部を有する絶縁膜30と、ショットキーコンタクト金属膜40と、接合金属膜60と、導電性支持基板50と、第2の電極75と、を含む。
図1を参照して、本発明の実施形態1であるSBDは、第1の主面側から第2の主面側への一方向に順に配置されている、第1の電極72と、III族窒化物膜20と、開口部を有する絶縁膜30と、ショットキーコンタクト金属膜40と、接合金属膜60と、導電性支持基板50と、第2の電極75と、を含む。また、ショットキーコンタクト金属膜40の一部が絶縁膜30の一部の上に乗り上げている。上述のように、実施形態1のSBDは、高耐圧で大電流を流すことができる。
図2を参照して、本発明の実施形態2であるSBDは、第1の主面側から第2の主面側への一方向に順に配置されている、第1の電極72と、III族窒化物膜20と、開口部を有する絶縁膜30と、ショットキーコンタクト金属膜40と、埋め込み金属膜80と、接合金属膜60と、導電性支持基板50と、第2の電極75と、を含む。また、ショットキーコンタクト金属膜40の一部が絶縁膜30の一部の上に乗り上げている。すなわち、実施形態2のSBDは、実施形態1のSBDにおいて、絶縁膜30が開口部を有することにより存在するショットキーコンタクト金属膜40の凹部と接合金属膜60との間に配置されている埋め込み金属膜80をさらに含む。
図3を参照して、本発明の実施形態3であるSBDは、第1の主面側から第2の主面側への一方向に順に配置されている、第1の電極72と、III族窒化物膜20と、開口部を有する絶縁膜30と、ショットキーコンタクト金属膜40と、埋め込み金属膜80と、拡散防止金属膜90と、接合金属膜60と、導電性支持基板50と、第2の電極75と、を含む。また、ショットキーコンタクト金属膜40の一部が絶縁膜30の一部の上に乗り上げている。すなわち、実施形態3のSBDは、実施形態2のSBDにおいて、ショットキーコンタクト金属膜40および埋め込み金属膜80と接合金属膜60との間に配置されている拡散防止金属膜90をさらに含む。
図4を参照して、本発明の実施形態4であるSBDは、第1の主面側から第2の主面側への一方向に順に配置されている、第1の電極72と、III族窒化物膜20と、開口部を有する絶縁膜30と、ショットキーコンタクト金属膜40と、拡散防止金属膜90と、接合金属膜60と、導電性支持基板50と、第2の電極75と、を含む。また、ショットキーコンタクト金属膜40の一部が絶縁膜30の一部の上に乗り上げている。すなわち、実施形態4のSBDは、実施形態1のSBDにおいて、ショットキーコンタクト金属膜40と接合金属膜60との間に配置されている拡散防止金属膜90をさらに含む。
図5を参照して、本発明の実施形態5であるSBDは、第1の主面側から第2の主面側への一方向に順に配置されている、第1の電極72と、III族窒化物膜20と、開口部を有する絶縁膜30と、ショットキーコンタクト金属膜40と、拡散防止金属膜90と、埋め込み金属膜80と、接合金属膜60と、導電性支持基板50と、第2の電極75と、を含む。また、ショットキーコンタクト金属膜40の一部が絶縁膜30の一部の上に乗り上げている。すなわち、実施形態5のSBDは、実施形態4のSBDにおいて、絶縁膜30が開口部を有することにより存在する拡散防止金属膜90の凹部と接合金属膜60との間に配置されている埋め込み金属膜80をさらに含む。
図9~図13を参照して、本発明の別の実施形態であるSBD(ショットキーバリアダイオード)の製造方法は、下地支持基板11と下地支持基板11の一主面側に接合された下地III族窒化物膜13とを含む下地複合基板10の下地III族窒化物膜13上に、III族窒化物膜20を形成する工程(図9~図13の(A))と、III族窒化物膜20上に、開口部を有する絶縁膜30を形成する工程(図9~図13の(B))と、絶縁膜30の開口部におけるIII族窒化物膜20上および絶縁膜30上に、ショットキーコンタクト金属膜40を形成する工程(図9~図13の(C))と、ショットキーコンタクト金属膜40上に、接合金属膜60を介在させて、導電性支持基板50を接合することにより接合基板100を得る工程(図9(D)、図10(E)、図11(F)、図12(E)、および図13(F))と、接合基板100から下地複合基板10を除去する工程(図9(E)、図10(F)、図11(G)、図12(F)、および図13(G))と、III族窒化物膜20上に第1の電極72を形成し、導電性支持基板50上に第2の電極75を形成する工程(図9(F)、図10(G)、図11(H)、図12(G)、および図13(H))と、を含む。
図9を参照して、本発明の実施形態6であるSBDの製造方法は、実施形態1のSBDを製造する方法であって、下地支持基板11と下地支持基板11の一主面側に接合された下地III族窒化物膜13とを含む下地複合基板10の下地III族窒化物膜13上に、III族窒化物膜20を形成する工程(図9(A))と、III族窒化物膜20上に、開口部を有する絶縁膜30を形成する工程(図9(B))と、絶縁膜30の開口部におけるIII族窒化物膜20上および絶縁膜30上に、ショットキーコンタクト金属膜40を形成する工程(図9(C))と、ショットキーコンタクト金属膜40上に、接合金属膜60を介在させて、導電性支持基板50を接合することにより接合基板100を得る工程(図9(D))と、接合基板100から下地複合基板10を除去する工程(図9(E))と、III族窒化物膜20上に第1の電極72を形成し、導電性支持基板50上に第2の電極75を形成する工程(図9(F))と、を含む。ここで、ショットキーコンタクト金属膜40を形成する工程(図9(C))において、ショットキーコンタクト金属膜40の一部が絶縁膜30の一部の上に乗り上げるようにショットキーコンタクト金属膜40を形成する。
図10を参照して、本発明の実施形態7であるSBDの製造方法は、実施形態2のSBDを製造する方法であって、下地支持基板11と下地支持基板11の一主面側に接合された下地III族窒化物膜13とを含む下地複合基板10の下地III族窒化物膜13上に、III族窒化物膜20を形成する工程(図10(A))と、III族窒化物膜20上に、開口部を有する絶縁膜30を形成する工程(図10(B))と、絶縁膜30の開口部におけるIII族窒化物膜20上および絶縁膜30上に、ショットキーコンタクト金属膜40を形成する工程(図10(C))と、ショットキーコンタクト金属膜40の凹部上に、埋め込み金属膜80を形成する工程(図10(D))と、ショットキーコンタクト金属膜40上および埋め込み金属膜80上に、接合金属膜60を介在させて、導電性支持基板50を接合することにより接合基板100を得る工程(図10(E))と、接合基板100から下地複合基板10を除去する工程(図10(F))と、III族窒化物膜20上に第1の電極72を形成し、導電性支持基板50上に第2の電極75を形成する工程(図10(G))と、を含む。ここで、ショットキーコンタクト金属膜40を形成する工程(図10(C))において、ショットキーコンタクト金属膜の一部が絶縁膜の一部の上に乗り上げるようにショットキーコンタクト金属膜40を形成する。
図11を参照して、本発明の実施形態8であるSBDの製造方法は、実施形態3のSBDを製造する方法であって、下地支持基板11と下地支持基板11の一主面側に接合された下地III族窒化物膜13とを含む下地複合基板10の下地III族窒化物膜13上に、III族窒化物膜20を形成する工程(図11(A))と、III族窒化物膜20上に、開口部を有する絶縁膜30を形成する工程(図11(B))と、絶縁膜30の開口部におけるIII族窒化物膜20上および絶縁膜30上に、ショットキーコンタクト金属膜40を形成する工程(図11(C))と、ショットキーコンタクト金属膜40の凹部上に、埋め込み金属膜80を形成する工程(図11(D))と、ショットキーコンタクト金属膜40上および埋め込み金属膜80上に、拡散防止金属膜90を形成する工程(図11(E))と、拡散防止金属膜90上に、接合金属膜60を介在させて、導電性支持基板50を接合することにより接合基板100を得る工程(図11(F))と、接合基板100から下地複合基板10を除去する工程(図11(G))と、III族窒化物膜20上に第1の電極72を形成し、導電性支持基板50上に第2の電極75を形成する工程(図11(H))と、を含む。ここで、ショットキーコンタクト金属膜40を形成する工程(図11(C))において、ショットキーコンタクト金属膜40の一部が絶縁膜30の一部の上に乗り上げるようにショットキーコンタクト金属膜40を形成する。
図12を参照して、本発明の実施形態9であるSBDの製造方法は、実施形態4のSBDを製造する方法であって、下地支持基板11と下地支持基板11の一主面側に接合された下地III族窒化物膜13とを含む下地複合基板10の下地III族窒化物膜13上に、III族窒化物膜20を形成する工程(図12(A))と、III族窒化物膜20上に、開口部を有する絶縁膜30を形成する工程(図12(B))と、絶縁膜30の開口部におけるIII族窒化物膜20上および絶縁膜30上に、ショットキーコンタクト金属膜40を形成する工程(図12(C))と、ショットキーコンタクト金属膜40上に拡散防止金属膜90を形成する工程(図12(D))と、拡散防止金属膜90上に、接合金属膜60を介在させて、導電性支持基板50を接合することにより接合基板100を得る工程(図12(E))と、接合基板100から下地複合基板10を除去する工程(図12(F))と、III族窒化物膜20上に第1の電極72を形成し、導電性支持基板50上に第2の電極75を形成する工程(図12(G))と、を含む。ここで、ショットキーコンタクト金属膜40を形成する工程(図12(C))において、ショットキーコンタクト金属膜40の一部が絶縁膜30の一部の上に乗り上げるようにショットキーコンタクト金属膜40を形成する。
図13を参照して、本発明の実施形態10であるSBDの製造方法は、実施形態5のSBDを製造する方法であって、下地支持基板11と下地支持基板11の一主面側に接合された下地III族窒化物膜13とを含む下地複合基板10の下地III族窒化物膜13上に、III族窒化物膜20を形成する工程(図13(A))と、III族窒化物膜20上に、開口部を有する絶縁膜30を形成する工程(図13(B))と、絶縁膜30の開口部におけるIII族窒化物膜20上および絶縁膜30上に、ショットキーコンタクト金属膜40を形成する工程(図13(C))と、ショットキーコンタクト金属膜40上に拡散防止金属膜90を形成する工程(図13(D))と、拡散防止金属膜90の凹部上に埋め込み金属膜80を形成する工程(図13(E))と、拡散防止金属膜90上および埋め込み金属膜80上に、接合金属膜60を介在させて、導電性支持基板50を接合することにより接合基板100を得る工程(図13(F))と、接合基板100から下地複合基板10を除去する工程(図13(G))と、III族窒化物膜20上に第1の電極72を形成し、導電性支持基板50上に第2の電極75を形成する工程(図13(H))と、を含む。ここで、ショットキーコンタクト金属膜40を形成する工程(図13(C))において、ショットキーコンタクト金属膜40の一部が絶縁膜30の一部の上に乗り上げるようにショットキーコンタクト金属膜40を形成する。
実施例1は、実施形態1のSBDおよび実施形態6のSBDの製造方法に対応する実施例である。
まず、図9(A)を参照して、厚さ450μmの下地支持基板11と、その一主面上に配置された厚さ400nmのSiO2膜からなる下地接合膜12と、その上に配置された厚さ150nmのGaN膜からなる下地III族窒化物膜13と、を含む下地複合基板10を準備した。下地III族窒化物膜の主面は、(0001)面であるGa原子面であった。かかる下地複合基板10は、図14に示すように、下地支持基板11とイオン注入領域が形成された下地III族窒化物膜母材基板13Dとを下地接合膜12を介在させて貼り合わせた後、下地III族窒化物膜母材基板13Dをイオン注入領域13iにおいて下地III族窒化物膜13と残りの下地III族窒化物膜母材基板30Eとに分離することにより得られたものであり、下地III族窒化物膜13は、その転位密度が1×105cm-2台と低く高い結晶性を有していた。
次に、図9(B)を参照して、III族窒化物膜20上に、プラズマCVD法により、シランガスとアンモニアガスを原料ガスとして用いて、厚さ500nmのSi3N4膜からなる絶縁膜30を形成した。次いで、RTA(高速アニール炉)を用いて、窒素雰囲気下600℃で3分間アニールした。
次に、図9(C)を参照して、開口部を有する絶縁膜30上にフォトリソグラフィー法でレジストマスクを形成し、絶縁膜30の開口部におけるIII族窒化物膜20上および絶縁膜30上に、EB蒸着法により、厚さ500ÅのNi層、厚さ3000ÅのAu層を順次形成し、アセトンを用いてリフトオフすることにより、パターンニングした。次に、RTA(高速アニール炉)を用い、窒素雰囲気下400℃で3分間アニールすることにより、合金化して、ショットキーコンタクト金属膜40の一部が絶縁膜30の一部の上に乗り上げたショットキーコンタクト金属膜40を形成した。ショットキーコンタクト金属膜40の一部が絶縁膜30の一部の上に乗り上げている部分の幅(以下、ショットキーコンタクト金属膜40の絶縁コンタクト部分40bの幅という)は、15μmであった。
次に、図9(D)を参照して、導電性支持基板50として、厚さ2インチ(5.08cm)で厚さ320μmのSi基板を準備した。このSi基板は、抵抗率が0.001Ωcm未満であり、p型にドープされていた。
次に、図9(E)を参照して、接合基板100から、下地支持基板11、下地接合膜12、および下地III族窒化物膜13を除去することにより、下地複合基板10を除去した。
次に、図9(F)を参照して、得られた基板のIII族窒化物膜20上に、フォトリソグラフィー法によりレジストマスクを形成し、その上からEB蒸着法により、厚さ200ÅのTi層、厚さ300ÅのAl層、ふたたび厚さ200ÅのTi層、最後に厚さ3000ÅのAu層を順に形成することにより、平面形状が300μm×5100μmの長方形状の第1の電極72を形成した。また、得られた基板の導電性支持基板50上に、EB蒸着法により、厚さ200ÅのTi層、厚さ300ÅのPt層、および厚さ3000ÅのAu層を順に形成することにより、第2の電極75を形成した。次に、RTAを用いて、第1の電極72および第2の電極75を、窒素雰囲気下250℃で3分間アニールした。
実施例2は、実施形態2のSBDおよび実施形態7のSBDの製造方法に対応する実施例である。
図10(A)~(C)を参照して、実施例1と同様にして、III族窒化物膜20の形成、平面形状が1000μm×1000μmで頂点部の曲率半径が100μmの弧状の正方形状の開口部を有する絶縁膜30の形成、および絶縁膜30の開口部におけるIII族窒化物膜上および絶縁膜の一部上へのショットキーコンタクト金属膜40の絶縁コンタクト部分40bの幅が30μmであるショットキーコンタクト金属膜40の形成を行なった。
図10(D)を参照して、ショットキーコンタクト金属膜40の凹部上に、フォトリソグラフィー法でレジストマスク(図示せず)を形成し、その上からEB(電子線)蒸着法により、厚さ4500ÅのNi層および厚さ500ÅのAu層を順次形成することにより、平面形状が990μm×990μmで頂点部の曲率半径が95μmの弧状の正方形状の埋め込み金属膜80を形成した。
図10(E)~(G)を参照して、実施例1と同様にして、接合基板100の形成、接合基板100からの下地複合基板10の除去、ならびに第1の電極72および第2の電極75の形成を行ない、さらにチップ化を行なうことにより、主面が1500μm×1500μmのSBDチップを得た。
実施例3は、実施形態3のSBDおよび実施形態8のSBDの製造方法に対応する実施例である。
図11(A)~(D)を参照して、実施例2と同様にして、III族窒化物膜20の形成、平面形状が1000μm×1000μmで頂点部の曲率半径が100μmの弧状の正方形状の開口部を有する絶縁膜30の形成、絶縁膜30の開口部におけるIII族窒化物膜上および絶縁膜の一部上へのショットキーコンタクト金属膜40の絶縁コンタクト部分40bの幅が30μmであるショットキーコンタクト金属膜40の形成、および平面形状が990μm×990μmで頂点部の曲率半径が95μmの弧状の正方形状の埋め込み金属膜80の形成を行なった。
図11(E)を参照して、ショットキーコンタクト金属膜40上および埋め込み金属膜80上に、EB(電子線)蒸着法により、厚さ500ÅのNi層、厚さ4000ÅのPt層、および厚さ500ÅのAu層を順次形成することにより、拡散防止金属膜90を形成した。
図11(F)~(H)を参照して、実施例1と同様にして、接合基板100の形成、接合基板100からの下地複合基板10の除去、ならびに第1の電極72および第2の電極75の形成を行ない、さらにチップ化を行なうことにより、主面が1500μm×1500μmのSBDチップを得た。
実施例4は、実施形態4のSBDおよび実施形態9のSBDの製造方法に対応する実施例である。
図12(A)~(C)を参照して、実施例1と同様にして、III族窒化物膜20の形成、平面形状が200μm×5000μmで頂点部の曲率半径が50μmの弧状の長方形状の開口部を有する絶縁膜30の形成、および絶縁膜30の開口部におけるIII族窒化物膜上および絶縁膜の一部上へのショットキーコンタクト金属膜40の絶縁コンタクト部分40bの幅が15μmであるショットキーコンタクト金属膜40の形成を行なった。
図12(D)を参照して、ショットキーコンタクト金属膜40上に、EB(電子線)蒸着法により、厚さ500ÅのNi層、厚さ4000ÅのPt層、および厚さ500ÅのAu層を順次形成することにより、拡散防止金属膜90を形成した。
図12(E)~(G)を参照して、実施例1と同様にして、接合基板100の形成、接合基板100からの下地複合基板10の除去、ならびに第1の電極72および第2の電極75の形成を行ない、さらにチップ化を行なうことにより、主面が400μm×5200μmのSBDチップを得た。
実施例5は、実施形態5のSBDおよび実施形態10のSBDの製造方法に対応する実施例である。
図13(A)~(D)を参照して、実施例4と同様にして、III族窒化物膜の20形成、平面形状が1000μm×1000μmで頂点部の曲率半径が100μmの弧状の正方形状の開口部を有する絶縁膜30の形成、絶縁膜30の開口部におけるIII族窒化物膜上および絶縁膜の一部上へのショットキーコンタクト金属膜40の絶縁コンタクト部分40bの幅が30μmであるショットキーコンタクト金属膜40の形成、および拡散防止金属膜90の形成を行なった。
図13(E)を参照して、拡散防止金属膜90の凹部上に、フォトリソグラフィー法でレジストマスク(図示せず)を形成し、その上からEB(電子線)蒸着法により、厚さ4500ÅのNi層および厚さ500ÅのAu層を順次形成することにより、平面形状が990μm×990μmで頂点部の曲率半径が95μmの弧状の正方形状の埋め込み金属膜80を形成した。
図13(F)~(H)を参照して、実施例1と同様にして、接合基板100の形成、接合基板100からの下地複合基板10の除去、ならびに第1の電極72および第2の電極75の形成を行ない、さらにチップ化を行なうことにより、主面が1500μm×1500μmのSBDチップを得た。
Claims (14)
- 第1の主面側から第2の主面側への一方向に順に配置されている、第1の電極と、III族窒化物膜と、開口部を有する絶縁膜と、ショットキーコンタクト金属膜と、接合金属膜と、導電性支持基板と、第2の電極と、を含むショットキーバリアダイオード。
- 前記ショットキーコンタクト金属膜の一部が前記絶縁膜の一部の上に乗り上げている請求項1に記載のショットキーバリアダイオード。
- 前記絶縁膜が前記開口部を有することにより存在する前記ショットキーコンタクト金属膜の凹部と前記接合金属膜との間に配置されている埋め込み金属膜をさらに含む請求項2に記載のショットキーバリアダイオード。
- 前記ショットキーコンタクト金属膜および前記埋め込み金属膜と前記接合金属膜との間に配置されている拡散防止金属膜をさらに含む請求項3に記載のショットキーバリアダイオード。
- 前記ショットキーコンタクト金属膜と前記接合金属膜との間に配置されている拡散防止金属膜をさらに含む請求項2に記載のショットキーバリアダイオード。
- 前記絶縁膜が開口部を有することにより存在する前記拡散防止金属膜の凹部と前記接合金属膜との間に配置されている埋め込み金属膜をさらに含む請求項5に記載のショットキーバリアダイオード。
- 前記第1の電極が前記III族窒化物膜の主面の一部上に位置する請求項2に記載のショットキーバリアダイオード。
- 下地支持基板と前記下地支持基板の一主面側に接合された下地III族窒化物膜とを含む下地複合基板の前記下地III族窒化物膜上に、III族窒化物膜を形成する工程と、
前記III族窒化物膜上に、開口部を有する絶縁膜を形成する工程と、
前記絶縁膜の開口部における前記III族窒化物膜上および前記絶縁膜上に、ショットキーコンタクト金属膜を形成する工程と、
前記ショットキーコンタクト金属膜上に、接合金属膜を介在させて、導電性支持基板を接合することにより接合基板を得る工程と、
前記接合基板から前記下地複合基板を除去する工程と、
前記III族窒化物膜上に第1の電極を形成し、前記導電性支持基板上に第2の電極を形成する工程と、を含むショットキーバリアダイオードの製造方法。 - 前記ショットキーコンタクト金属膜を形成する工程において、前記ショットキーコンタクト金属膜の一部が前記絶縁膜の一部の上に乗り上げるように前記ショットキーコンタクト金属膜を形成する請求項8に記載のショットキーバリアダイオードの製造方法。
- 前記ショットキーコンタクト金属膜を形成する工程の後、前記接合基板を得る工程の前に、前記ショットキーコンタクト金属膜の凹部上に、埋め込み金属膜を形成する工程をさらに含み、
前記接合基板を得る工程は、前記ショットキーコンタクト金属膜上および前記埋め込み金属膜上に、前記接合金属膜を介在させて、前記導電性支持基板を接合することにより行なう請求項9に記載のショットキーバリアダイオードの製造方法。 - 前記埋め込み金属膜を形成する工程の後、前記接合基板を得る工程の前に、前記ショットキーコンタクト金属膜上および前記埋め込み金属膜上に、拡散防止金属膜を形成する工程をさらに含み、
前記接合基板を得る工程は、前記拡散防止金属膜上に、前記接合金属膜を介在させて、前記導電性支持基板を接合することにより行なう請求項10に記載のショットキーバリアダイオードの製造方法。 - 前記ショットキーコンタクト金属膜を形成する工程の後、前記接合基板を得る工程の前に、前記ショットキーコンタクト金属膜上に拡散防止金属膜を形成する工程をさらに含み、
前記接合基板を得る工程は、前記拡散防止金属膜上に、前記接合金属膜を介在させて、前記導電性支持基板を接合することにより行なう請求項9に記載のショットキーバリアダイオードの製造方法。 - 前記拡散防止金属膜を形成する工程の後、前記接合基板を得る工程の前に、前記拡散防止金属膜の凹部上に、埋め込み金属膜を形成する工程をさらに含み、
前記接合基板を得る工程は、前記拡散防止金属膜上および前記埋め込み金属膜上に、前記接合金属膜を介在させて、前記導電性支持基板を接合することにより行なう請求項12に記載のショットキーバリアダイオードの製造方法。 - 前記第1の電極は、前記III族窒化物膜の主面の一部上に形成する請求項9に記載のショットキーバリアダイオードの製造方法。
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JP2003257973A (ja) * | 2002-03-04 | 2003-09-12 | Sumitomo Electric Ind Ltd | ヴィアホールの形成方法 |
JP2007129166A (ja) * | 2005-11-07 | 2007-05-24 | Toshiba Corp | 半導体装置及びその製造方法 |
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JP7190245B2 (ja) | 2017-03-29 | 2022-12-15 | クロミス,インコーポレイテッド | 垂直窒化ガリウムショットキーダイオード |
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