WO2014199510A1 - 半導体装置の製造方法および半導体装置 - Google Patents
半導体装置の製造方法および半導体装置 Download PDFInfo
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- WO2014199510A1 WO2014199510A1 PCT/JP2013/066453 JP2013066453W WO2014199510A1 WO 2014199510 A1 WO2014199510 A1 WO 2014199510A1 JP 2013066453 W JP2013066453 W JP 2013066453W WO 2014199510 A1 WO2014199510 A1 WO 2014199510A1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 146
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 95
- 230000007547 defect Effects 0.000 claims abstract description 48
- 239000013078 crystal Substances 0.000 claims abstract description 33
- 238000010521 absorption reaction Methods 0.000 claims abstract description 23
- 230000001678 irradiating effect Effects 0.000 claims abstract description 16
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 61
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 60
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 5
- -1 argon ion Chemical class 0.000 claims description 5
- 229910002601 GaN Inorganic materials 0.000 claims description 3
- 238000004544 sputter deposition Methods 0.000 claims description 3
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 2
- 239000012212 insulator Substances 0.000 description 7
- 238000000605 extraction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- UIZLQMLDSWKZGC-UHFFFAOYSA-N cadmium helium Chemical compound [He].[Cd] UIZLQMLDSWKZGC-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L21/0445—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 crystalline silicon carbide
- H01L21/048—Making electrodes
- H01L21/0485—Ohmic electrodes
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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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02524—Group 14 semiconducting materials
- H01L21/02529—Silicon carbide
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02656—Special treatments
- H01L21/02664—Aftertreatments
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/268—Bombardment with radiation with high-energy radiation using electromagnetic radiation, e.g. laser radiation
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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
- H01L21/34—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 not provided for in groups H01L21/0405, H01L21/0445, H01L21/06, H01L21/16 and H01L21/18 with or without impurities, e.g. doping materials
- H01L21/42—Bombardment with radiation
- H01L21/423—Bombardment with radiation with high-energy radiation
- H01L21/428—Bombardment with radiation with high-energy radiation using electromagnetic radiation, e.g. laser radiation
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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
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
- H01L29/1608—Silicon carbide
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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
- H01L29/45—Ohmic electrodes
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66053—Multistep manufacturing processes of devices having a semiconductor body comprising crystalline silicon carbide
- H01L29/6606—Multistep manufacturing processes of devices having a semiconductor body comprising crystalline silicon carbide 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
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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
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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
- H01L29/0607—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration
- H01L29/0611—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices
- H01L29/0615—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE]
- H01L29/0619—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE] with a supplementary region doped oppositely to or in rectifying contact with the semiconductor containing or contacting region, e.g. guard rings with PN or Schottky junction
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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
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/47—Schottky barrier electrodes
Definitions
- the present invention relates to a semiconductor device manufacturing method and a semiconductor device.
- Patent Document 1 has a step of roughening the state of the exposed surface of the n + -type SiC layer, and forming an electrode on the exposed surface of the n + -type SiC layer 1 infested step for roughening the exposed It is disclosed that the surface is a polishing process or laser irradiation.
- the absorption edge wavelength of the SiC substrate is about 380 nm, and laser light having a wavelength shorter than 380 nm. It was necessary to irradiate.
- the absorption edge wavelength of the SiC substrate is the wavelength of the lowest energy light absorbed by the SiC substrate.
- lasers that emit laser light having a wavelength shorter than 380 nm include a helium cadmium laser (He—Cd laser: wavelength 325 nm) and a nitrogen laser (N2 laser: wavelength 350 nm).
- an object of the present invention is to provide a method of manufacturing a semiconductor device and a semiconductor device capable of obtaining ohmic contact with a semiconductor substrate while reducing the manufacturing cost.
- a method for manufacturing a semiconductor device includes: Forming a semiconductor layer on a first main surface of a semiconductor substrate made of a crystal having a wide band gap; Generating lattice defects on the second principal surface opposite to the first principal surface of the semiconductor substrate; Irradiating the second main surface of the semiconductor substrate with a laser beam having a wavelength longer than the absorption edge wavelength, which is the wavelength of the lowest energy light absorbed by the crystal, after the step of generating the lattice defects; Forming an electrode on the second main surface of the semiconductor substrate after the irradiating step; Have
- One embodiment of the present invention is a method for manufacturing the semiconductor device, wherein:
- the lattice defect is a stacking fault.
- One embodiment of the present invention is a method for manufacturing the semiconductor device, wherein:
- the step of generating the lattice defect is a step of locally applying a force to the second main surface of the semiconductor substrate.
- One embodiment of the present invention is a method for manufacturing the semiconductor device, wherein: The step of generating the lattice defect is a step of grinding the second main surface of the semiconductor substrate.
- One embodiment of the present invention is a method for manufacturing the semiconductor device, wherein: The step of generating the lattice defect is a step of sputtering the second main surface of the semiconductor substrate.
- One embodiment of the present invention is a method for manufacturing the semiconductor device, wherein:
- the step of irradiating is a step of irradiating a laser beam having an energy of 0.2 J or more per square centimeter.
- One embodiment of the present invention is a method for manufacturing the semiconductor device, wherein: The shape of the laser beam on the second main surface of the semiconductor substrate is circular or linear.
- One embodiment of the present invention is a method for manufacturing the semiconductor device, wherein:
- the laser beam is a laser beam emitted from an argon ion laser.
- One embodiment of the present invention is a method for manufacturing the semiconductor device, wherein:
- the laser beam is a laser beam emitted from a YAG laser or SHG green laser.
- One embodiment of the present invention is a method for manufacturing the semiconductor device, wherein:
- the crystal is silicon carbide or gallium nitride.
- a semiconductor device includes: A semiconductor substrate made of a crystal having a wide band gap; A semiconductor layer formed on the first main surface of the semiconductor substrate; An electrode formed on a second main surface opposite to the first main surface of the semiconductor substrate; With The semiconductor substrate has a laser beam having a wavelength longer than an absorption edge wavelength, which is a wavelength of light having the lowest energy absorbed by the crystal after lattice defects are formed on the second main surface side of the semiconductor substrate. By irradiating the second main surface of the substrate, it has a conductive layer formed on the second main surface side of the semiconductor substrate, The electrode was formed after the laser beam was irradiated.
- a step of forming a semiconductor layer on a first main surface of a semiconductor substrate made of a crystal having a wide band gap is opposite to the first main surface of the semiconductor substrate.
- laser light having a wavelength longer than the absorption edge wavelength, which is the wavelength of the lowest energy light absorbed by the crystal is applied to the semiconductor substrate.
- laser light having a wavelength longer than the absorption edge wavelength of the crystal is absorbed at the position where the lattice defects of the semiconductor substrate are generated. Then, the laser light is absorbed at the position where the lattice defect is generated, whereby a part of elements constituting the semiconductor substrate is evaporated, and a conductive layer is formed on the second main surface side of the semiconductor substrate.
- an electrode is formed on the second main surface of the semiconductor substrate, whereby a good ohmic contact can be obtained between the semiconductor substrate and the electrode.
- the manufacturing cost of the semiconductor device can be reduced.
- the semiconductor device manufacturing method of the present invention can obtain ohmic contact with the semiconductor substrate while reducing the manufacturing cost.
- laser light having a wavelength longer than the absorption edge wavelength is irradiated.
- the irradiated laser beam is absorbed by lattice defects and the laser beam does not reach the semiconductor layer, so that the semiconductor layer can be prevented from being broken by the laser beam.
- FIG. 1 is a schematic cross-sectional view of a semiconductor device 10 according to an embodiment which is an aspect of the present invention.
- FIG. 2 is a flowchart illustrating an example of a method for manufacturing the semiconductor device 10.
- FIG. 3 is a schematic cross-sectional view showing a first manufacturing process of the semiconductor device 10 according to the embodiment which is an aspect of the present invention.
- FIG. 4 is a schematic cross-sectional view showing a second manufacturing process of the semiconductor device 10 according to the embodiment which is an aspect of the present invention.
- FIG. 5 is a schematic cross-sectional view showing a third manufacturing process of the semiconductor device 10 according to the embodiment which is an aspect of the present invention.
- FIG. 6 is a schematic cross-sectional view showing a fourth manufacturing process of the semiconductor device 10 according to the embodiment which is an aspect of the present invention.
- a Schottky diode will be described as an example of a device including a wide band gap semiconductor substrate.
- the wide band gap is a band gap larger than at least a silicon band gap of 1.12 eV.
- the wide band gap semiconductor substrate includes, for example, a substrate made of a group III-V semiconductor, and examples of the group III-V semiconductor include SiC and GaN.
- a SiC substrate is used as an example of a wide band gap semiconductor substrate.
- a semiconductor device 10 includes an SiC substrate 1 and an n-type SiC formed on the anode-side surface (first main surface) of the SiC substrate 1 as shown in FIG.
- a semiconductor layer 2 is provided.
- a ring-shaped p-type SiC layer 5 having a central axis in a direction perpendicular to the first main surface (z-axis direction) is formed.
- the semiconductor device 10 further includes a Schottky electrode formed on the anode-side surface surrounded by the p-type SiC layer 5 of the n-type SiC semiconductor layer 2 and a part of the anode-side surface of the p-type SiC layer 5. 6 is provided.
- the semiconductor device 10 further includes a lead electrode 7 formed on the anode side of the Schottky electrode 6.
- the semiconductor device 10 further includes an n-type SiC so as to cover the side surfaces of the Schottky electrode 6 and the extraction electrode 7 and the outer periphery of the surface on the surface of the n-type SiC semiconductor layer 2 including the outer peripheral surface of the p-type SiC layer 5.
- An insulator 8 formed in a ring shape with a direction perpendicular to the anode side surface of the semiconductor layer 2 as a central axis is provided.
- the semiconductor device 10 further includes an electrode 9 formed on the cathode side surface (second main surface) of the SiC substrate 1.
- the second main surface is a surface of the SiC substrate 1 opposite to the first main surface.
- the SiC substrate 1 described above is a semiconductor substrate made of a SiC crystal having a wide band gap.
- laser light having a wavelength longer than the absorption edge wavelength, which is the wavelength of the lowest energy light absorbed by the crystal, is applied to the second main surface.
- the semiconductor substrate has a conductive layer formed on the second main surface side.
- the SiC substrate 1 has, for example, an n-type low resistance characteristic containing impurities at a high concentration.
- the n-type SiC semiconductor layer 2 has, for example, an n-type high resistance characteristic including impurities at a low concentration.
- the n-type SiC semiconductor layer 2 has, for example, an impurity concentration and a thickness required to ensure a predetermined breakdown voltage.
- the p-type SiC layer 5 is shown as being divided into two sections, but they are integrally formed.
- the p-type SiC layer 5 is formed by, for example, ion-implanting aluminum (Al) or boron (B) and then activating it at 1500 ° C. or higher.
- the Schottky electrode 6 is made of, for example, any one of titanium (Ti), molybdenum (Mo), nickel (Ni), or an alloy thereof.
- the extraction electrode 7 is made of, for example, aluminum (Al), gold (Au), or an alloy thereof.
- the insulator 8 is divided into two as the cross-section of the insulator 8, but is formed integrally.
- the insulator 8 is made of, for example, silicon oxide, silicon nitride, or polyimide.
- n-type SiC semiconductor layer 2, p-type SiC layer 5, Schottky electrode 6, extraction electrode 7 and insulator 8 constitute a device (Schottky diode) including SiC substrate 1.
- a method of manufacturing the semiconductor device 10 of the present embodiment having the above-described configuration will be described with reference to FIGS. 2 to 6.
- a crystal having a wide band gap is formed.
- a semiconductor layer is formed on the semiconductor substrate.
- the n-type SiC semiconductor layer 2 is formed on the first main surface of the SiC substrate 1 by, for example, an epitaxial method (step S101).
- the p-type SiC layer 5, the Schottky electrode 6, the extraction electrode 7 and the insulator 8 are formed on the surface side of the n-type SiC semiconductor layer 2 (step S102).
- lattice defects are formed on the second main surface side of the SiC substrate 1.
- the lattice defects include point defects, line defects, and surface defects, and the surface defects include stacking defects.
- This lattice defect is formed by, for example, applying a force locally to the second main surface of the SiC substrate 1.
- the lattice defect is formed by grinding the second main surface of the SiC substrate 1.
- the surface roughness of the second main surface after grinding is preferably 5 nm or more.
- lattice defects are formed on the second main surface of the SiC substrate 1.
- the lattice defect may be a point defect or a line defect.
- the crystal structure of the SiC crystal is 4H, and the absorption edge wavelength is about 380 nm.
- the absorption wavelength band is shifted to the long wavelength side, so that the laser light having a wavelength longer than the absorption edge wavelength of the SiC crystal having a crystal structure of 4H (here, about 380 nm as an example). Absorbed.
- the lattice defect may be formed by sputtering the second main surface of SiC substrate 1.
- the second main surface of the SiC substrate 1 is irradiated with laser light L having a wavelength longer than the absorption edge wavelength of the SiC crystal (step S104).
- the second main surface of the SiC substrate 1 is irradiated with laser light emitted from a laser having a wavelength longer than the absorption edge wavelength of 380 nm. To do.
- Examples of lasers having wavelengths longer than the absorption edge wavelength of 380 nm include a green laser (wavelength is about 532 nm), an argon ion laser with a wavelength of 488.0 nm, an argon ion laser with a wavelength of 514.5 nm, a YAG laser with a wavelength of 532 nm, and SHG. (Second Harmonic Generation) There is a green laser.
- the second main surface is irradiated with a laser beam having an energy of 0.2 J or more per square centimeter.
- the laser light irradiation surface has a circular shape
- the cross-section has a major axis of 50 ⁇ m
- the laser light is irradiated onto the second main surface every time the laser light irradiation position is shifted by 50 ⁇ m.
- the circular shape includes not only a perfect circle but also an ellipse. Thereby, the entire second main surface of SiC substrate 1 is irradiated with the laser light.
- the laser light applied to the second main surface of the SiC substrate 1 is absorbed at the position where the lattice defect is generated, so that silicon contained in the SiC crystal constituting the SiC substrate 1 evaporates, and the first of the SiC substrate 1 is evaporated.
- a conductive layer of graphite is formed on the surface side of the two main surfaces.
- the laser light irradiation surface shape on the second main surface is circular.
- the present invention is not limited to this, and the shape of the laser light irradiation surface may be linear.
- the crystal structure of the SiC crystal is not limited to 4H, but may be 6H.
- the electrode 9 is formed on the second main surface of the SiC substrate 1.
- electrode 9 is formed on the second main surface of SiC substrate 1 (step S105).
- a method for manufacturing a semiconductor device includes a step of forming a semiconductor layer over a first main surface of a semiconductor substrate made of a crystal having a wide band gap, and a first main surface of the semiconductor substrate.
- a laser having a wavelength longer than the absorption edge wavelength, which is the wavelength of the lowest energy light absorbed by the crystal after the step of generating lattice defects on the second principal surface side opposite to the surface and the step of generating lattice defects A step of irradiating the second main surface of the semiconductor substrate with light; and a step of forming an electrode on the second main surface of the semiconductor substrate after the irradiating step.
- laser light having a wavelength longer than the absorption edge wavelength of the crystal is absorbed at a position where the lattice defects of the semiconductor substrate are generated. Then, the laser light is absorbed at the position where the lattice defect is generated, whereby a part of elements constituting the semiconductor substrate is evaporated, and a conductive layer is formed on the second main surface side of the semiconductor substrate.
- the crystal having a wide band gap is silicon carbide (SiC)
- SiC silicon carbide
- the laser light having a wavelength longer than the absorption edge wavelength is absorbed when a lattice defect occurs, so that silicon evaporates.
- a conductive layer of graphite is formed on the surface side of the second main surface of the semiconductor substrate.
- an electrode is formed on the second main surface of the semiconductor substrate, so that the semiconductor substrate and the electrode can have good ohmic contact.
- a laser having a wavelength longer than the absorption edge wavelength used when forming the conductive layer for example, an argon ion laser having a wavelength of 488.0 nm or a wavelength of 514.5 nm, a YAG laser having a wavelength of 532 nm, or the like) or an SHG green laser is used. It is cheaper than a laser with a wavelength shorter than 380 nm (for example, helium cadmium laser or nitrogen laser). Therefore, manufacturing cost of the semiconductor device can be reduced by manufacturing the semiconductor device using this laser. Therefore, the semiconductor device manufacturing method of the present invention can obtain ohmic contact with the semiconductor substrate while reducing the manufacturing cost.
- a laser beam having a wavelength longer than the absorption edge wavelength is generated on the second main surface side opposite to the first main surface of the semiconductor substrate.
- a step of irradiating the second main surface is absorbed by the lattice defect and the laser beam does not reach the semiconductor layer, so that the semiconductor layer can be prevented from being broken by the laser beam.
- a Schottky diode has been described as an example of a device.
- the present invention is not limited to this and can be applied to various diodes.
- the present invention can be applied to field effect transistors (for example, MOSFET (Metal-Oxide-Semiconductor-Field-Effect-Transistor)) or IGBT (Insulated-Gate-Bipolar-Transistor).
- MOSFET Metal-Oxide-Semiconductor-Field-Effect-Transistor
- IGBT Insulated-Gate-Bipolar-Transistor
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Abstract
Description
ワイドバンドギャップを有する結晶からなる半導体基板の第1主面上に半導体層を形成する工程と、
前記半導体基板の前記第1主面とは反対の第2主面側に格子欠陥を生じさせる工程と、
前記格子欠陥を生じさせる工程の後に、前記結晶が吸収する最も低いエネルギーの光の波長である吸収端波長より長い波長のレーザ光を前記半導体基板の前記第2主面に照射する工程と、
前記照射する工程の後に、前記半導体基板の前記第2主面に電極を形成する工程と、
を有する。
前記格子欠陥は、積層欠陥である。
前記格子欠陥を生じさせる工程は、前記半導体基板の前記第2主面に局所的に力を加える工程である。
前記格子欠陥を生じさせる工程は、前記半導体基板の前記第2主面を研削する工程である。
前記格子欠陥を生じさせる工程は、前記半導体基板の前記第2主面をスパッタする工程である。
前記照射する工程は、一平方センチメートルあたり0.2J以上のエネルギーのレーザ光を照射する工程である。
前記半導体基板の第2主面における前記レーザ光の形状は、円状または線状である。
前記レーザ光は、アルゴンイオンレーザから出射されたレーザ光である。
前記レーザ光は、YAGレーザ、又は、SHGグリーンレーザから出射されたレーザ光である。
前記結晶は、炭化ケイ素または窒化ガリウムである。
ワイドバンドギャップを有する結晶からなる半導体基板と、
前記半導体基板の第1主面上に形成された半導体層と、
前記半導体基板の前記第1主面とは反対の第2主面上に形成された電極と、
を備え、
前記半導体基板は、前記半導体基板の前記第2主面側に格子欠陥が形成された後に、前記結晶が吸収する最も低いエネルギーの光の波長である吸収端波長より長い波長のレーザ光が前記半導体基板の前記第2主面に照射されることで、該半導体基板の前記第2主面側に形成された導電層を有し、
前記電極は、前記レーザ光が照射された後に形成された。
図2のフローチャートに示すようにまず、ワイドバンドギャップを有する結晶からなる半導体基板上に半導体層を形成する。本実施形態では一例として、SiC基板1の第1主面上にn型SiC半導体層2を例えばエピタキシャル法で形成する(ステップS101)。
2 n型SiC半導体層
5、5-1、5-2 p型SiC層
6 ショットキー電極
7 引出し電極
8、8-1、8-2 絶縁物
9 電極
10 半導体装置
Claims (11)
- ワイドバンドギャップを有する結晶からなる半導体基板の第1主面上に半導体層を形成する工程と、
前記半導体基板の前記第1主面とは反対の第2主面側に格子欠陥を生じさせる工程と、
前記格子欠陥を生じさせる工程の後に、前記結晶が吸収する最も低いエネルギーの光の波長である吸収端波長より長い波長のレーザ光を前記半導体基板の前記第2主面に照射する工程と、
前記照射する工程の後に、前記半導体基板の前記第2主面に電極を形成する工程と、
を有することを特徴とする半導体装置の製造方法。 - 前記格子欠陥は、積層欠陥であることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記格子欠陥を生じさせる工程は、前記半導体基板の前記第2主面に局所的に力を加える工程であることを特徴とする請求項2に記載の半導体装置の製造方法。
- 前記格子欠陥を生じさせる工程は、前記半導体基板の前記第2主面を研削する工程であることを特徴とする請求項3に記載の半導体装置の製造方法。
- 前記格子欠陥を生じさせる工程は、前記半導体基板の前記第2主面をスパッタする工程であることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記照射する工程は、一平方センチメートルあたり0.2J以上のエネルギーのレーザ光を照射する工程であることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記半導体基板の第2主面における前記レーザ光の形状は、円状または線状であることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記レーザ光は、アルゴンイオンレーザから出射されたレーザ光であることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記レーザ光は、YAGレーザ、又は、SHGグリーンレーザから出射されたレーザ光であることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記結晶は、炭化ケイ素または窒化ガリウムであることを特徴とする請求項1に記載の半導体装置の製造方法。
- ワイドバンドギャップを有する結晶からなる半導体基板と、
前記半導体基板の第1主面上に形成された半導体層と、
前記半導体基板の前記第1主面とは反対の第2主面上に形成された電極と、
を備え、
前記半導体基板は、前記半導体基板の前記第2主面側に格子欠陥が形成された後に、前記結晶が吸収する最も低いエネルギーの光の波長である吸収端波長より長い波長のレーザ光が前記半導体基板の前記第2主面に照射されることで、該半導体基板の前記第2主面側に形成された導電層を有し、
前記電極は、前記レーザ光が照射された後に形成されたことを特徴とする半導体装置。
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MYPI2015700118A MY183542A (en) | 2013-06-14 | 2013-06-14 | Method for manufacturing semiconductor device and semiconductor device |
CN201380077346.5A CN105324833B (zh) | 2013-06-14 | 2013-06-14 | 半导体装置的制造方法以及半导体装置 |
PCT/JP2013/066453 WO2014199510A1 (ja) | 2013-06-14 | 2013-06-14 | 半導体装置の製造方法および半導体装置 |
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JP2019169709A (ja) * | 2018-03-22 | 2019-10-03 | インフィニオン テクノロジーズ アクチエンゲゼルシャフトInfineon Technologies AG | 炭化ケイ素デバイスおよび炭化ケイ素デバイスを製造するための方法 |
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