WO2023113547A1 - 산화니켈-산화갈륨 pn 이종접합 형성 방법 및 그 방법으로 제조된 쇼트키 다이오드 - Google Patents
산화니켈-산화갈륨 pn 이종접합 형성 방법 및 그 방법으로 제조된 쇼트키 다이오드 Download PDFInfo
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- H10D62/8271—Heterojunctions comprising only oxide semiconductor materials heterojunctions, e.g. IGZO/IZO
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- H10D62/832—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials being Group IV materials, e.g. B-doped Si or undoped Ge being Group IV materials comprising two or more elements, e.g. SiGe
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- H10D62/85—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials being Group III-V materials, e.g. GaAs
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Definitions
- the present invention relates to a heterojunction between nickel oxide and gallium oxide.
- gallium oxide is a newly emerging super-wideband semiconductor material following silicon carbide and gallium nitride, and has a band gap of about 4.7 to about 4.9 eV, which far exceeds the band gap width of silicon carbide and gallium nitride, and theoretically has a breakdown electric field of 8 MV/ very high in cm.
- gallium oxide can grow substrates and epitaxial layers at a relatively low cost compared to other ultra-wideband semiconductor materials.
- a method for forming a nickel oxide-gallium oxide heterojunction includes forming a trench by etching an n-type gallium oxide epitaxial layer epitaxially grown on an n-type gallium oxide substrate with an etching mask, in a mixed gas atmosphere of argon and oxygen, the n-type oxidation forming a p-type nickel oxide region on the bottom surface of the trench by sputtering a nickel oxide target on the gallium epitaxial layer; and sputtering a nickel target on the n-type gallium oxide epitaxial layer in an argon gas atmosphere to form the p-type nickel oxide region
- a step of forming a nickel layer on it may be included.
- the etching mask may include a hard mask formed on the n-type gallium oxide epitaxial layer and a photoresist mask formed on the hard mask.
- the etching mask may be formed with an inclination of the sidewall of the trench in a range of 45 degrees to 70 degrees.
- the photoresist mask may form a first trench region in the n-type gallium oxide epitaxial layer, and the hard mask may form a second trench region having sidewalls extending from sidewalls of the first trench region.
- the flow rate of oxygen in the mixed gas may be 9.0% to 23.0%.
- the flow rate of oxygen in the mixed gas may be 16.6% to 23.0%.
- a method for manufacturing a nickel oxide-gallium oxide heterojunction diode includes forming a plurality of trenches in an active region and an edge region by etching an n-type gallium oxide epitaxial layer epitaxially grown on an n-type gallium oxide substrate as an etch mask, argon and oxygen Forming a p-type nickel oxide region on the bottom surface of the trench by sputtering a nickel oxide target on the n-type gallium oxide epitaxial layer in a mixed gas atmosphere of, forming an insulating layer defining the active region on the edge region forming a nickel layer on the p-type nickel oxide region and the n-type gallium oxide epitaxial layer by sputtering a nickel target on the active region and the edge region in an argon gas atmosphere, and forming an anode on the upper surface of the nickel layer
- the method may include forming an electrode
- the p-type nickel oxide region may include a first p-type nickel oxide region formed in the active region, a second p-type nickel oxide region formed over the active region and the edge region, and a second p-type nickel oxide region formed in the edge region.
- a 3 p-type nickel oxide region may be included.
- FIG. 1 is a diagram illustrating a nickel oxide-gallium oxide pn heterojunction Schottky diode as an example.
- FIG. 2 is a diagram exemplarily illustrating a process of forming a pattern on a hard mask to form a nickel oxide-gallium oxide pn heterojunction.
- FIG. 3 is a diagram exemplarily illustrating a process of forming a nickel oxide-gallium oxide pn heterojunction on a gallium oxide epitaxial layer according to an embodiment.
- FIG. 4 is a diagram exemplarily illustrating a process according to another embodiment of forming a nickel oxide-gallium oxide pn heterojunction on a gallium oxide epitaxial layer.
- FIG. 5 is a diagram exemplarily illustrating a process of forming a nickel oxide-gallium oxide pn heterojunction on a gallium oxide epitaxial layer according to another embodiment.
- FIG. 6 is a diagram exemplarily illustrating a process of adjusting a slope of a sidewall of a trench.
- FIG. 7 and 8 are views exemplarily illustrating a process of manufacturing a nickel oxide-gallium oxide pn heterojunction Schottky diode.
- FIG. 9 is a graph showing electrical characteristics of nickel oxide according to oxygen flow rate by way of example.
- 10 is a graph showing current density measured by applying a forward voltage to a nickel oxide-gallium oxide pn heterojunction Schottky diode.
- 11 is a graph showing current density measured by applying a reverse voltage to a nickel oxide-gallium oxide pn heterojunction Schottky diode.
- first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another.
- FIG. 1 is a diagram illustrating a nickel oxide-gallium oxide pn heterojunction Schottky diode as an example.
- the nickel oxide-gallium oxide pn heterojunction Schottky diode includes an n-type gallium oxide substrate 100, an n-type gallium oxide epitaxial layer 110, and a p-type nickel oxide region 121, 122, 123; 120 generically), an insulating layer 130, a Schottky metal layer 140, an anode electrode 150, and a cathode electrode 160.
- the n-type gallium oxide substrate 100 is formed of single-crystal ⁇ -gallium oxide ( ⁇ -Ga 2 O 3 ) doped with an n-type dopant.
- the thickness of the n-type gallium oxide substrate 100 is about 590 ⁇ m, and the n-type dopant concentration may be about 4E18cm -3 .
- the n-type dopant may be, for example, tin (Sn).
- the n-type gallium oxide epitaxial layer 110 is undoped or ⁇ -gallium oxide doped with an n-type dopant epitaxially grown on the main surface of the n-type gallium oxide substrate 100 .
- the n-type dopant may be, for example, silicon (Si), and the concentration of the n-type dopant may be about 1E16cm -3 .
- the n-type gallium oxide epitaxial layer 110 may have a thickness of about 10 ⁇ m.
- the p-type nickel oxide (NiO x ) region 120 is formed on the bottom surface of the trench (see 111 in FIG. 3 and 112 in FIG. 4 ) extending from the top surface of the n-type gallium oxide epitaxial layer 110 toward the inside, Depending on the slope of the sidewall of the trench, it may also be formed on the sidewall.
- the p-type nickel oxide region 120 includes a plurality of first p-type nickel oxide regions 121 formed in the active region of the Schottky diode, a second p-type nickel oxide region 122 formed to surround the active region, and an edge. A plurality of third p-type nickel oxide regions 123 formed in the region may be included.
- the plurality of first p-type nickel oxide regions 121 serve as a junction barrier
- the second p-type nickel oxide regions 122 serve as a buffer
- the plurality of third p-type nickel oxide regions 122 serve as a buffer. (123) may serve as an electric field confinement structure, for example, a guard ring.
- one side of the second p-type nickel oxide region 122 may contact the Schottky metal layer 130 .
- the p-type nickel oxide region 120 may be formed by a sputtering process.
- the p-type nickel oxide region 120 and the n-type gallium oxide epitaxial layer 110 form a pn heterojunction.
- the insulating layer 130 is formed on at least a portion of the second p-type nickel oxide region 122 and an upper portion of the edge region to define an active region.
- the insulating layer 130 fills the trench in which the second p-type nickel oxide region 122 is formed and the trench in which the plurality of third p-type nickel oxide regions 123 are formed. Therefore, at least a portion of the lower surface of the insulating layer 130 is in contact with the second p-type nickel oxide region 122 and the third p-type nickel oxide region 123, and the remaining region is n-type gallium oxide epitaxial layer 110 can be in contact with the upper surface of
- An inner surface of the second insulating layer 130 may be formed to be inclined downward toward the active region. When viewed from above, the inclined surface may overlap at least a portion of the second p-type nickel oxide region 122 .
- the Schottky metal layer 140 is on top of the n-type gallium oxide epitaxial layer 110 in the active region so as to contact the top surface of the n-type gallium oxide epitaxial layer 110 and the plurality of first p-type nickel oxide regions 121. is formed
- the upper surfaces of the Schottky metal layer 140 and the n-type gallium oxide epitaxial layer 110 are in Schottky contact, and the Schottky metal layer 140 and the plurality of first p-type nickel oxide regions 121 are in ohmic contact.
- the schottky metal layer 140 may extend in a horizontal direction to cover a portion of the insulating layer 130 .
- the anode electrode 150 is formed on the upper surface of the Schottky metal layer 140, and the cathode electrode 160 is formed on the lower surface of the n-type gallium oxide substrate 100.
- a silicide layer (not shown) for ohmic contact may be formed between the n-type gallium oxide substrate 100 and the cathode electrode 160 .
- the plurality of first p-type nickel oxide regions 121 form a pn heterojunction with the n-type gallium oxide epitaxial layer 110, thereby improving breakdown voltage and leakage current characteristics compared to conventional Schottky diodes.
- the plurality of first p-type nickel oxide regions 121 form a depletion layer due to pn junctions with the n-type gallium oxide epitaxial layer 110 . Since the depletion layer formed along the periphery of the plurality of first p-type nickel oxide regions 121 blocks a path through which leakage current flows, it has a lower leakage current value than a general Schottky diode.
- the depletion layer formed along the periphery of the plurality of first p-type nickel oxide regions 121 can relatively reduce an electric field concentrated in a region where the Schottky metal layer 140 and the n-type gallium oxide epitaxial layer 110 are in contact. can Due to this, it is possible to implement a relatively higher threshold voltage than a general Schottky diode.
- FIG. 2 is a diagram exemplarily illustrating a process of forming a pattern on a hard mask to form a nickel oxide-gallium oxide pn heterojunction.
- an n-type gallium oxide epitaxial layer 110 is formed on the main surface of the n-type gallium oxide substrate 100 . Foreign substances are removed by cleaning and plasma treating the n-type gallium oxide substrate 100 .
- the n-type gallium oxide epitaxial layer 110 is undoped or ⁇ -gallium oxide doped with an n-type dopant epitaxially grown on the main surface of the n-type gallium oxide substrate 100 .
- the n-type dopant may be, for example, silicon (Si), and the concentration of the n-type dopant may be about 1E16cm -3 . Meanwhile, the n-type gallium oxide epitaxial layer 110 may have a thickness of about 10 ⁇ m.
- the n-type gallium oxide epitaxial layer 110 is formed by, for example, halide vapor phase epitaxy (HVPE), metalorganic chemical vapor deposition (MOCVD), mist CVD, molecular beam epitaxy (MBE), pulsed laser deposition (PLD), or the like. It can be deposited on the type gallium oxide substrate 100.
- HVPE halide vapor phase epitaxy
- MOCVD metalorganic chemical vapor deposition
- MBE molecular beam epitaxy
- PLD pulsed laser deposition
- a silicon oxide layer 10 is formed on the upper surface of the n-type gallium oxide epitaxial layer 110.
- the silicon oxide layer 10 may be formed by depositing silicon oxide (SiO 2 ) to a thickness of about 0.7 ⁇ m by chemical vapor deposition or spin coating.
- a photoresist layer 20 is formed on the upper surface of the silicon oxide layer 10 to a thickness of about 1.6 ⁇ m.
- the photoresist layer 20 may be formed by soft baking after spin coating the photoresist on the silicon oxide layer 10 .
- FIG. 3 is a diagram exemplarily illustrating a process of forming a nickel oxide-gallium oxide pn heterojunction on a gallium oxide epitaxial layer according to an embodiment, after the process illustrated in FIG. 2, a hard mask is used as an etching mask Thus, the n-type gallium oxide epitaxial layer 110 is etched to form the trench 111 and the p-type nickel oxide region 120 on at least a bottom surface of the trench 111 .
- the photoresist mask 21 is formed by removing the photoresist in the area where the trench 111 is to be formed in the photoresist layer 20.
- the silicon oxide layer 10 exposed by the photoresist mask 21 is etched to form a hard mask 11.
- the etching gas is O 2 and C 4 F 8 , and may be supplied to the chamber at a flow rate of about 1:9.
- the chamber pressure is maintained at about 7 mTorr, and power of about 2 kW can be applied for about 1 minute.
- An etching rate of the silicon oxide layer 10 may be about 0.23 ⁇ m/min.
- a buffer process of injecting an etching gas to form a gas atmosphere, an etching process of applying power, and a cooling process may be repeatedly performed.
- the trench 111 is formed by etching the n-type gallium oxide epitaxial layer 110 exposed by the hard mask 11.
- the etching gas is N 2 and BCl 3 , and may be supplied to the chamber at a flow rate of about 1:7.
- the chamber pressure is maintained at about 5 mTorr, and power of about 500 W may be applied for about 1 minute.
- the etching rate of the n-type gallium oxide epitaxial layer 110 is about 0.057 ⁇ m/min, and the etching ratio between the n-type gallium oxide epitaxial layer 110 and the hard mask 11 may be about 1:1.2.
- the formed trench 111 may have a critical dimension (CD) of about 2 ⁇ m, a depth of about 0.7 ⁇ m, and a sidewall slope of about 45 degrees.
- CD critical dimension
- a buffer process of injecting an etching gas to form a gas atmosphere, an etching process of applying power, and a cooling process may be repeatedly performed.
- a p-type nickel oxide layer 120' is formed in the trench 111.
- a p-type nickel oxide layer 120' is formed to a thickness of about 300 nm on the upper surface of the trench 111 and the n-type gallium oxide epitaxial layer 110 by sputtering a nickel oxide target or a nickel target. are layered During sputtering, the flow rate of oxygen is adjusted between about 0.0% and 23.0%, preferably between about 9.0% and 16.6%, the chamber pressure is maintained at about 5 mTorr, and a power of about 150 W is applied for about 90 minutes.
- a photoresist mask 22 is formed in the trench 111 in which the p-type nickel oxide layer 120' is formed, and the p-type nickel oxide layer stacked on the upper surface of the n-type gallium oxide epitaxial layer 110 120' is removed by etching.
- FIG. 4 is a diagram exemplarily illustrating a process according to another embodiment of forming a nickel oxide-gallium oxide pn heterojunction on a gallium oxide epitaxial layer. ) may be etched to form the trench 111 and the p-type nickel oxide region 120 on at least the bottom surface of the trench 111 .
- the photoresist layer 20 is formed on the upper surface of the n-type gallium oxide epitaxial layer 110, and the photoresist in the region where the trench 111 is to be formed is removed from the photoresist layer 20 to obtain a photoresist A mask 21 is formed.
- the n-type gallium oxide epitaxial layer 110 exposed by the photoresist mask 21 is etched to form a trench 111.
- the polymer generated during etching is deposited on the sidewall of the trench 111 , so the sidewall slope may be about 45 degrees.
- a p-type nickel oxide layer 120' is formed in the trench 111.
- a p-type nickel oxide layer 120' is formed to a thickness of about 300 nm on the upper surface of the trench 111 and the n-type gallium oxide epitaxial layer 110 by sputtering a nickel oxide target or a nickel target. are layered
- a photoresist mask 22 is formed in the trench 111 in which the p-type nickel oxide layer 120' is formed, and the p-type nickel oxide layer stacked on the upper surface of the n-type gallium oxide epitaxial layer 110 120' is removed by etching.
- FIG. 5 exemplarily shows a process according to another embodiment of forming a nickel oxide-gallium oxide pn heterojunction on a gallium oxide epitaxial layer.
- a hard mask and a photoresist are formed.
- the trench 111 and the p-type nickel oxide region 120 may be formed on at least a bottom surface of the trench 111 by etching the n-type gallium oxide epitaxial layer 110 using it as an etch mask.
- the photoresist mask 21 is formed by removing the photoresist in the area where the trench 111 is to be formed in the photoresist layer 20.
- the n-type gallium oxide epitaxial layer 110 exposed by the hard mask 11 and the photoresist mask 21 stacked thereon is etched to form a first trench region 111'.
- the first trench region 111' is formed by the photoresist mask 21. Since the photoresist mask 21 is also etched at a constant rate, the thickness of the photoresist mask 21 may be adjusted according to the depth of the first trench region 111'.
- a second trench region 113 having a sidewall extending from the sidewall of the first trench region 112 is formed with the hard mask 11 .
- the first trench region 112 and the second trench region 113 constitute a trench 111 .
- a p-type nickel oxide layer 120' is formed in the trench 111.
- a p-type nickel oxide layer 120' is formed to a thickness of about 300 nm on the upper surface of the trench 111 and the n-type gallium oxide epitaxial layer 110 by sputtering a nickel oxide target or a nickel target. are layered During sputtering, the flow rate of oxygen is adjusted between about 0.0% and 23.0%, preferably between about 9.0% and 16.6%, the chamber pressure is maintained at about 5 mTorr, and a power of about 150 W is applied for about 90 minutes.
- a photoresist mask 22 is formed in the trench 111 in which the p-type nickel oxide layer 120' is formed, and the p-type nickel oxide layer stacked on the upper surface of the n-type gallium oxide epitaxial layer 110 120' is removed by etching.
- FIG. 6 is an enlarged view of portion A of FIG. 5 and illustrates a process of adjusting a slope of a sidewall of a trench by way of example.
- the slope of the sidewall from the entrance to the bottom surface of the first trench region 112 is determined by the thickness of the photoresist mask 21, and the second trench region 113
- the sidewall slope of is determined by a combination of the sidewall slope of the first trench region 112 and the hard mask 11 . Accordingly, when the hard mask 11 and the photoresist mask 21 are used as etch masks, the sidewall of the trench 111 may have an inclination of about 45 degrees to about 70 degrees.
- the trench sidewall slope is illustrated.
- the first trench regions 112a, 112b, and 112c formed by the photoresist mask 21 have sidewalls inclined at about 45 degrees due to polymer generated by the photoresist.
- the depths of the first trench regions 112a, 112b, and 112c increase, and the depths of the second trench regions 113a, 113b, and 113c conversely become shallow.
- the sidewall inclined at about 45 degrees due to the polymer is also etched downward.
- the entire sidewall of the trench 111 approaches a curved surface. Therefore, sidewall inclinations ⁇ 1 , ⁇ 2 , and ⁇ 3 may be measured using tangent lines tangent to the curved surface.
- the sidewall inclination ⁇ 1 approaches about 70 degrees
- the thickness of the hard mask 11 is the thinnest
- the sidewall inclination ⁇ 3 approaches about 45 degrees.
- the depth of the trench 111 composed of the first trench region 112 and the second trench region 113 may also be adjusted.
- the entrance edge and the bottom edge of the trench 111 are formed at an obtuse angle, so that the electric field concentration on the entrance edge and the bottom edge is alleviated, and the depth of the p-type nickel oxide region 120, that is, the n-type gallium oxide epitaxial
- the vertical distance from the upper surface of the layer 110 to the position where the p-type nickel oxide region 120 is formed can be adjusted.
- FIG. 7 and 8 are views exemplarily illustrating a process of manufacturing a nickel oxide-gallium oxide pn heterojunction Schottky diode.
- an insulating material layer 130 ′ is formed on the entire upper surface of the n-type gallium oxide epitaxial layer 110 .
- the insulating material layer 130 ′ may be formed by depositing, for example, silicon oxide (SiO 2 ), phosphosilicate glass (PSG), borosilicate glass (BSG), or borophosphosilicate glass (BPSG).
- a photoresist mask 30 is formed on the top surface of the insulating material layer 130'.
- the photoresist mask 30 defines an etched region in the insulating material layer 130'.
- the insulating material layer 130' is etched to form the insulating layer 130, and the photoresist layer 30 is removed.
- the insulating layer 130 may be formed by etching a side surface of the insulating material layer 130 ′ toward the active region with a downward slope.
- a Schottky metal layer 140 is formed on the n-type gallium oxide epitaxial layer 110 and the insulating layer 130 in the active region.
- the Schottky metal layer 140 is deposited to a thickness of about 100 nm on the n-type gallium oxide epitaxial layer 110 and the insulating layer 130 in the active region by sputtering a nickel target.
- the flow rate of argon is maintained at about 20 sccm
- the chamber pressure is maintained at about 5 mTorr
- power of about 100 W may be applied for about 8 minutes.
- the anode electrode 150 is formed on the Schottky metal layer 140 .
- the anode electrode 150 is formed of metal (Ti, Au, Al) or metal alloy.
- a photoresist layer 40 is formed on the anode electrode 150.
- the photoresist layer 40 may extend in a lateral direction to overlap the third p-type nickel oxide region 123 formed at the innermost part of the edge region.
- a cathode electrode 160 is formed on the lower surface of the n-type gallium oxide substrate 100.
- the cathode electrode 160 is formed of metal (Ti, Au, Al) or metal alloy.
- FIG. 9 is a graph exemplarily showing electrical characteristics of nickel oxide according to oxygen flow rate
- FIG. 10 is a graph showing current density measured by applying a forward voltage to a nickel oxide-gallium oxide pn heterojunction Schottky diode
- 11 is a graph showing current density measured by applying a reverse voltage to a nickel oxide-gallium oxide pn heterojunction Schottky diode.
- the hole concentration and resistivity of the p-type nickel oxide layer 120' may be adjusted according to the oxygen flow rate during deposition.
- 9 is a graph of the p-type nickel oxide layer 120' deposited while controlling the oxygen flow rate in the argon-oxygen mixture gas to about 0.0%, about 2.4%, about 4.7%, about 9.0%, about 16.6%, and about 23.0%. Hall concentration and resistivity are shown, and Table 1 shows the process parameters and the measured breakdown voltage according to each oxygen flow rate.
- the hole concentration in the oxygen flow rate range of about 9.0% to about 23.0% is greatly increased than the hole concentration in the oxygen flow rate range of about 0.0% to about 4.7%, and the specific resistance in the oxygen flow rate range of about 16.6% to about 23.0%. is greatly reduced than the specific resistance in the oxygen flow rate range of about 0.0% to about 9.0%.
- the breakdown voltage is highest in the range of about 9.0% to about 23.0% of the oxygen flow rate. Therefore, the oxygen flow rate can be adjusted in the range of about 9.0% to about 23.0%, preferably in the range of about 16.6% to about 23.0%. Referring to FIG.
- the reverse voltage-current characteristics of nickel oxide-gallium oxide pn heterojunction Schottky diodes manufactured with an oxygen flow rate of about 9.0% to about 16.6% have a breakdown voltage of about 700V or more, whereas an oxygen flow rate of about 0.0% to about 4.7% of the nickel oxide-gallium oxide pn heterojunction Schottky diode has a breakdown voltage of 700V or less.
- the leakage current of the nickel oxide-gallium oxide pn heterojunction Schottky diode manufactured with an oxygen flow ratio of about 16.6% to about 23.0% is maintained constant until right before the breakdown voltage, while the nickel oxide-gallium oxide manufactured with other oxygen flow ratios
- the leakage current increases steadily.
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Abstract
Description
산소 유량비 | 0.0% | 2.4% | 4.7% | 9.0% | 16.6% | 23.0% |
공정 시간(분) | 37 | 66 | 85 | 89 | 90 | 92 |
증착율(nm/min) | 8.1 | 4.5 | 3.5 | 3.4 | 3.3 | 3.2 |
홀 농도(cm-3) | 1.8x1013 | 1.2x1015 | 1.0x1016 | 3.7x1018 | 1.05x1019 | 1.03x1019 |
비저항(ohm·cm) | 98,400 | 994 | 564 | 96 | 42 | 44 |
항복전압(V) | 623 | 683 | 570 | 705 | 713 | 678 |
Claims (11)
- n형 산화갈륨 기판에 에피 성장된 n형 산화갈륨 에피층을 식각 마스크로 식각하여 트렌치를 형성하는 단계;아르곤 및 산소의 혼합 가스 분위기에서, 상기 n형 산화갈륨 에피층에 산화니켈 타겟을 스퍼터링하여 상기 트렌치의 바닥면에 p형 산화니켈 영역을 형성하는 단계; 및아르곤 가스 분위기에서, 상기 n형 산화갈륨 에피층에 니켈 타겟을 스퍼터링하여 상기 p형 산화니켈 영역상에 니켈층을 형성하는 단계를 포함하는 산화니켈-산화갈륨 이종접합 형성 방법.
- 청구항 1에 있어서, 상기 식각 마스크는 상기 n형 산화갈륨 에피층상에 형성된 하드 마스크 및 상기 하드 마스크상에 형성된 포토 레지스트 마스크로 구성되며,상기 식각 마스크는 상기 트렌치의 측벽 기울기를 45도 내지 70도 범위에서 형성하게 하는 산화니켈-산화갈륨 이종접합 형성 방법.
- 청구항 2에 있어서, 상기 포토 레지스트 마스크는 상기 n형 산화갈륨 에피층에 제1 트렌치 영역을 형성하며, 상기 하드 마스크는 상기 제1 트렌치 영역의 측벽에서부터 연장된 측벽을 갖는 제2 트렌치 영역을 형성하는 산화니켈-산화갈륨 이종접합 형성 방법.
- 청구항 1에 있어서, 상기 혼합 가스에서 산소의 유량비는 9.0% 내지 23.0%인 산화니켈-산화갈륨 이종접합 형성 방법.
- 청구항 4에 있어서, 상기 혼합 가스에서 산소의 유량비는 16.6% 내지 23.0%인 산화니켈-산화갈륨 이종접합 형성 방법.
- n형 산화갈륨 기판에 에피 성장된 n형 산화갈륨 에피층을 식각 마스크로 식각하여 액티브 영역 및 엣지 영역에 복수의 트렌치를 형성하는 단계;아르곤 및 산소의 혼합 가스 분위기에서, 상기 n형 산화갈륨 에피층에 산화니켈 타겟을 스퍼터링하여 상기 트렌치의 바닥면에 p형 산화니켈 영역을 형성하는 단계;상기 액티브 영역을 정의하는 절연층을 상기 엣지 영역에 형성하는 단계;아르곤 가스 분위기에서, 상기 액티브 영역 및 상기 엣지 영역에 니켈 타겟을 스퍼터링하여 상기 p형 산화니켈 영역 및 상기 n형 산화갈륨 에피층상에 니켈층을 형성하는 단계; 및상기 니켈층의 상면에 애노드 전극 및 상기 n형 산화갈륨 기판의 하면에 캐소드 전극을 형성하는 단계를 포함하는 산화니켈-산화갈륨 이종접합 다이오드 제조 방법.
- 청구항 6에 있어서, 상기 식각 마스크는 상기 n형 산화갈륨 에피층상에 형성된 하드 마스크 및 상기 하드 마스크상에 형성된 포토 레지스트 마스크로 구성되며,상기 식각 마스크는 상기 트렌치의 측벽 기울기를 45도 내지 70도 범위에서 형성하게 하는 산화니켈-산화갈륨 이종접합 다이오드 제조 방법.
- 청구항 7에 있어서, 상기 포토 레지스트 마스크는 상기 n형 산화갈륨 에피층에 제1 트렌치 영역을 형성하며, 상기 하드 마스크는 상기 제1 트렌치 영역의 측벽에서부터 연장된 측벽을 갖는 제2 트렌치 영역을 형성하는 산화니켈-산화갈륨 이종접합 다이오드 제조 방법.
- 청구항 6에 있어서, 상기 혼합 가스에서 산소의 유량비는 9.0% 내지 23.0%인 산화니켈-산화갈륨 이종접합 다이오드 제조 방법.
- 청구항 9에 있어서, 상기 혼합 가스에서 산소의 유량비는 16.6% 내지 23.0%인 산화니켈-산화갈륨 이종접합 다이오드 제조 방법.
- 청구항 6에 있어서, 상기 p형 산화니켈 영역은상기 액티브 영역에 형성된 제1 p형 산화니켈 영역,상기 액티브 영역과 상기 엣지 영역에 걸쳐 형성된 제2 p형 산화니켈 영역, 및상기 엣지 영역에 형성된 제3 p형 산화니켈 영역을 포함하는 산화니켈-산화갈륨 이종접합 다이오드 제조 방법.
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JP2016178336A (ja) * | 2016-06-10 | 2016-10-06 | 住友電気工業株式会社 | 半導体装置の製造方法 |
JP2019036593A (ja) * | 2017-08-10 | 2019-03-07 | 株式会社タムラ製作所 | ダイオード |
JP6580267B2 (ja) * | 2016-07-26 | 2019-09-25 | 三菱電機株式会社 | 半導体装置および半導体装置の製造方法 |
JP6667712B2 (ja) * | 2017-02-14 | 2020-03-18 | 三菱電機株式会社 | 電力用半導体装置 |
JP6685476B2 (ja) * | 2017-06-29 | 2020-04-22 | 三菱電機株式会社 | 酸化物半導体装置、および、酸化物半導体装置の製造方法 |
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JP2016178336A (ja) * | 2016-06-10 | 2016-10-06 | 住友電気工業株式会社 | 半導体装置の製造方法 |
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JP6667712B2 (ja) * | 2017-02-14 | 2020-03-18 | 三菱電機株式会社 | 電力用半導体装置 |
JP6685476B2 (ja) * | 2017-06-29 | 2020-04-22 | 三菱電機株式会社 | 酸化物半導体装置、および、酸化物半導体装置の製造方法 |
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