WO2022085297A1 - 半導体装置およびそれを用いた半導体部品 - Google Patents
半導体装置およびそれを用いた半導体部品 Download PDFInfo
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- WO2022085297A1 WO2022085297A1 PCT/JP2021/031086 JP2021031086W WO2022085297A1 WO 2022085297 A1 WO2022085297 A1 WO 2022085297A1 JP 2021031086 W JP2021031086 W JP 2021031086W WO 2022085297 A1 WO2022085297 A1 WO 2022085297A1
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- H01L29/41725—Source or drain electrodes for field effect devices
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Definitions
- the present disclosure relates to a semiconductor device using a nitride semiconductor such as gallium nitride (GaN) as a semiconductor material and a semiconductor component using the same.
- a nitride semiconductor such as gallium nitride (GaN) as a semiconductor material and a semiconductor component using the same.
- GaN-FETs field effect transistors
- GaN which is a nitride semiconductor
- a GaN-FET a GaN layer is formed as a channel layer and AlGaN is formed as a barrier layer on a semiconductor substrate, and a two-dimensional electron gas generated by spontaneous polarization and piezopolarization at a heterojunction interface formed by these two layers. Is generally used as a channel.
- GaN-FET has low loss and is capable of high-speed switching operation compared to SiC etc., and is expected to be miniaturized at the system level.
- the channel current flows in the direction parallel to the substrate.
- the source pad, the drain pad, and the gate pad which supply a voltage or pass a current from an external power source through a wire or the like to the FET, are all formed on the surface side of the substrate.
- the source electrode, drain electrode, and gate electrode of the transistor in the active region are electrically connected to each pad via their respective lead wires or aggregate wires.
- the centralized wiring of the gate electrode is pulled out to the gate pad by using a thin and thin gate aggregated wiring electrode.
- the gate electrodes are bundled outside the active region via the gate lead-out wiring, and further bypass the outer periphery of the active region and are connected to the gate electrode pad layer via the gate aggregate wiring. ing.
- the gate electrode of each unit transistor reaches the gate pad, which is usually present in one or two in the nitride semiconductor device.
- the wiring length of the gate electrode up to the above becomes long and the gate wiring resistance becomes large. Therefore, especially for high-power applications, when the chip size is large and the wiring length of the gate-intensive wiring becomes long, the gate-aggregated wiring resistance becomes large, and there is room for improvement in high-speed switching characteristics.
- the present disclosure is suitable for high-speed switching operation in which the gate aggregate wiring and the source wire pad are alternately formed to reduce the gate aggregate wiring resistance while reducing the chip size.
- the main purpose is to provide semiconductor devices and semiconductor parts using them.
- the semiconductor device includes a substrate, a first nitride semiconductor layer on the substrate, and a second nitride semiconductor on the first nitride semiconductor layer.
- a source-aggregated wire extending in a first direction perpendicular to the longitudinal direction of the head, a gate pad, a first gate-aggregated wire extending in the first direction, a plurality of second gate-aggregated wires, and the first direction.
- the drain electrode is electrically connected to the drain pad via the drain outlet wiring, and the source electrode is provided with the source extraction wiring and the source aggregation. It is electrically connected to the plurality of source pads via wiring, and the gate electrode includes the first gate aggregation wiring, the plurality of second gate aggregation wiring, and the third gate aggregation wiring. Is electrically connected to the gate pad located at both ends or one end of the third gate aggregated wiring, and the plurality of source pads and the plurality of second gate aggregated wiring alternate in the first direction. Is formed in.
- the semiconductor component according to one aspect of the present disclosure includes the above-mentioned semiconductor device and a lead frame
- the lead frame includes a die pad portion to which the semiconductor device is fixed, a source terminal, a gate terminal, and a drain. It has terminals, and the source pad and the source terminal, the gate pad and the gate terminal, and the drain pad and the drain terminal are electrically connected via a bonding wire, respectively.
- FIG. 1A is a plan view of the semiconductor device according to the first embodiment.
- FIG. 1B is a cross-sectional view of the semiconductor device according to the first embodiment.
- FIG. 2 is a plan view of the semiconductor device according to the first modification of the first embodiment.
- FIG. 3 is a plan view of the semiconductor device according to the second modification of the first embodiment.
- FIG. 4 is a plan view of the semiconductor device according to the third modification of the first embodiment.
- FIG. 5 is an enlarged view of the gate-intensive wiring of the semiconductor device according to the first embodiment.
- FIG. 6A is a plan view of the semiconductor device according to the second embodiment.
- FIG. 6B is a cross-sectional view of the semiconductor device according to the second embodiment.
- FIG. 7A is a plan view of the semiconductor device according to the third embodiment.
- FIG. 7B is a cross-sectional view of the semiconductor device according to the third embodiment.
- FIG. 8A is a cross-sectional view of the semiconductor component according to the fourth embodiment.
- FIG. 8B is a bottom view of the semiconductor component according to the fourth embodiment.
- FIG. 9 is a cross-sectional view of the semiconductor component according to the fifth embodiment.
- FIG. 1A is a plan view of the nitride semiconductor device of the first embodiment.
- FIG. 1B is a cross-sectional view taken along the line Ib-Ib in FIG. 1A.
- the semiconductor devices of FIGS. 1A and 1B include a substrate 101, a buffer layer 102, a first nitride semiconductor layer 103, a second nitride semiconductor layer 104, a source electrode 105, a drain electrode 106, a gate electrode 107, and an active region 108. , Source lead-out wiring 109, drain lead-out wiring 110, source pad 112, drain pad 113, gate pad 114, source aggregate wiring 115, first gate aggregation wiring 117, second gate aggregation wiring 118, and third gate.
- the aggregate wiring 119 is provided.
- a buffer layer 102 (for example, GaN, AlGaN, which is a group III nitride semiconductor) is placed on a substrate 101 (for example, a substrate such as Si, Sapphire, SiC, GaN, AlN, etc.).
- a first nitride semiconductor layer 103 made of GaN (in addition, for example, InGaN, AlGaN, AlInGaN, etc., which are Group III nitride semiconductors) having a single layer or a plurality of layers such as AlN, InGaN, and AlInGaN).
- a second nitride semiconductor layer 104 made of AlGaN (in addition, for example, GaN, InGaN, AlGaN, AlN, AlInGaN, which are Group III nitride semiconductors, etc.). May be good) is formed.
- the second nitride semiconductor layer 104 has a larger bandgap than the first nitride semiconductor layer 103.
- the AlGaN / GaN interface is due to the effects of piezopolarization and spontaneous polarization generated from the lattice constant difference between AlGaN and GaN.
- a high-concentration two-dimensional electron gas (2DEG) layer is formed on the GaN layer side in the vicinity.
- the region where this two-dimensional electron gas is formed is the active region 108 in FIG. 1A.
- a source electrode 105 and a drain electrode 106 are formed on the second nitride semiconductor layer 104 so as to be separated from each other.
- the source electrode 105 and the drain electrode 106 are made of metals such as Ti, Al, Mo, and Hf that ohmically contact any one of the two-dimensional electron gas layer, the second nitride semiconductor layer 104, and the first nitride semiconductor layer 103. It may be composed of one or a combination of two or more electrodes and electrically connected to the two-dimensional electron gas layer of the active region 108.
- the gate electrode 107 is formed on the second nitride semiconductor layer 104 between the source electrode 105 and the drain electrode 106.
- the gate electrode 107 may be an electrode in which one or two or more metals such as Ti, Ni, Pd, Pt, Au, W, WSi, Ta, TiN, Al, Mo, Hf, and Zr are combined.
- P-type nitride containing p-type impurities (Mg, Zn, C, etc.) between at least one of the source electrode 105, the drain electrode 106, and the gate electrode 107 and the second nitride semiconductor layer 104.
- a material semiconductor layer may be formed, and at least one of the source electrode 105, the drain electrode 106, and the gate electrode 107 is in direct contact with the p-type nitride semiconductor layer and the second nitride semiconductor layer 104. It may be formed so as to.
- a source outlet wiring 109 and a drain outlet wiring 110 made of, for example, Au or Al are formed on the source electrode 105 and the drain electrode 106, respectively.
- a finger-shaped source electrode 105 and a drain electrode 106 are separately formed on the second nitride semiconductor layer, and between the source electrode 105 and the drain electrode 106.
- a finger-shaped gate electrode 107 is formed in the drain electrode 106, and the drain electrode 106 is connected to the drain pad 113 via the drain lead-out wiring 110.
- the source electrode 105 is electrically connected to a plurality of source pads 112 via a source lead-out wiring 109 and a source aggregation wiring 115 extending in a direction perpendicular to the finger direction.
- the finger direction means the longitudinal direction of the finger-shaped gate electrode.
- the direction perpendicular to the finger direction may be referred to as a first direction.
- the gate electrode 107 includes a first gate aggregate wiring 117 extending in a first direction perpendicular to the finger direction, a plurality of second gate aggregation wirings 118, and a third gate aggregation wiring 119 extending in the first direction. It is electrically connected to the gate pads 114 located at both ends or one ends of the third gate aggregate wiring 119, and the plurality of source pads 112 and the second gate aggregation wiring 118 are alternately formed in the first direction.
- the wiring width of each second gate aggregate wiring 118 in the first direction can be preferably 50 ⁇ m to 1000 ⁇ m.
- the gate electrode 107, the first gate aggregated wiring 117, the second gate aggregated wiring 118, and the third gate aggregated wiring 119 may be simultaneously formed of the same metal configuration. Further, an ESD protection element 120 using a transistor type diode is formed in the vicinity of the gate pad 114 to prevent ESD destruction. In the ESD protection element 120, the anode is electrically connected to the source aggregation wiring 115, and the cathode is electrically connected to the gate pad 114 (not shown).
- the source outlet wiring 109 and the drain outlet wiring 110 play a role of drawing current and / or voltage from the source electrode 105 and the drain electrode 106 of the finger portion of the active region 108, respectively.
- the first to third gate aggregate wirings 117, 118, 119 and the source aggregation wiring 115 play a role of consolidating the current and / or voltage drawn from the gate electrode 107 and the source extraction wiring 109, respectively.
- the source pad 112, the drain pad 113, and the gate pad 114 are electrically connected to the electric contacts on the leads of the lead frame via the bonding wire.
- a gate current is supplied from the gate pad to the gate electrode in the active region via a single thin and thin gate aggregate wiring extending in the first direction.
- the gate current can be supplied through the plurality of second gate aggregate wiring 118 and the wide third gate aggregation wiring 119 extending in the first direction, the gate current from the gate pad 114 to the gate electrode 107 can be supplied.
- the electrical resistance is reduced and a larger gate current can be supplied.
- the turn-on switching speed (dV / dt, dI / dt) of a transistor increases as the gate current increases. Therefore, the present disclosure enables high-speed switching operation and miniaturization at the system level.
- the inductance of the entire gate-aggregated wiring is also reduced, parasitic oscillation due to the formation of a positive feedback circuit can be suppressed, and the parameter margin of the RC circuit consisting of a parallel circuit of R and C (speed-up capacitor) at the gate input section can be improved.
- the degree of freedom in designing the drive circuit and layout can be improved.
- the gate current can be increased, it is possible to pass a large pulsed current of several hundred ⁇ s or less through the gate in the product inspection process, which causes defects caused by crystal defects in the vicinity of the gate electrode 107. A screening test that removes the current is possible, and the product quality can be improved.
- by reducing the resistance of the gate-intensive wiring it is possible to suppress the occurrence of the so-called electromigration phenomenon in which metal atoms move by passing a current through the integrated wiring, and the product life can be improved.
- FIG. 2 is a plan view of the semiconductor device according to the first modification of the first embodiment.
- the third gate aggregate wiring 219 and the gate pad 214 can be formed of a material thicker than the first and second gate aggregation wirings 217 and 218.
- the third gate-intensive wiring 219 and the gate pad 214 may be formed of the same metal as the source-intensive wiring 215, and may be formed of, for example, Au or Cu.
- the third gate aggregate wiring 219 and the gate pad 214 are electrically connected to each of the plurality of second gate aggregation wirings 218. As a result, the gate aggregation wiring resistance can be further reduced while reducing the chip size.
- FIG. 3 is a plan view of the semiconductor device according to the second modification of the first embodiment.
- each source pad 312 can be electrically connected via a plurality of source pad connecting portions 324.
- Each source pad connecting portion 324 can be formed of the same material as the source pad 312 and the source aggregate wiring 315 via an interlayer film such as SiO2 or SiN on the upper portion of each second gate aggregation wiring 318. It is electrically isolated from the gate aggregate wiring 318 of 2. Since a capacitance is formed in the overlapping portion between the second gate aggregate wiring 318 and the source pad connecting portion via the interlayer film, the gate-source capacitance (Cgs) increases.
- FIG. 4 is a plan view of the semiconductor device according to the third modification of the first embodiment.
- the gate pad 414 can be formed in the finger direction with respect to the source pad 412.
- the source pad 412 is connected to the source terminal of the lead frame via the bonding wire, and the source pad 412, the drain pad 413, and the gate pad 414 are substantially the same height. If the pad height is different, the pressing load when the bonding tool descends fluctuates, and the impact load on the bonding pad causes damage to the bonding pad, the interlayer film under it, and the nitride semiconductor layer. It is necessary to adjust the pressure of the bonding load, but by setting the pads to have substantially the same height as in the present embodiment, such pressure adjustment of the bonding load becomes unnecessary.
- FIG. 5 is an enlarged view of the gate-intensive wiring of the semiconductor device according to the first embodiment.
- the first, second, or third gate aggregate wirings 517, 518, and 519 are formed in a plurality of slits 523.
- This slit preferably has a slit width of 0.1 ⁇ m to 3.0 ⁇ m and a slit spacing of 1 ⁇ m to 10 ⁇ m in the finger direction, and a slit width of 3 ⁇ m to 40 ⁇ m and a slit spacing in the finger vertical direction. It is 1.0 ⁇ m to 10 ⁇ m.
- each slit may be configured in a grid, staggered, or any other shape.
- the semiconductor device includes a substrate, a first nitride semiconductor layer on the substrate, a second nitride semiconductor layer on the first nitride semiconductor layer, and the above.
- the gate-aggregated wiring of 3 is provided, the drain electrode is electrically connected to the drain pad via the drain lead-out wiring, and the source electrode is connected to the source lead-out wiring and the source-intensive wiring.
- the gate electrode is electrically connected to the plurality of source pads, and the gate electrode is provided via the first gate aggregation wiring, the plurality of second gate aggregation wirings, and the third gate aggregation wiring. It is electrically connected to the gate pad located at both ends or one end of the third gate aggregated wiring, and the plurality of source pads and the plurality of second gate aggregated wiring are alternately formed in the first direction. There is.
- the gate wiring resistance can be reduced, that is, the resistance component of the first to third gate integrated wiring can be reduced, and high-speed switching operation can be facilitated. It also enables the chip size to be reduced as a semiconductor device.
- the gate electrode, the first gate aggregate wiring, the second gate aggregation wiring, and the third gate aggregation wiring may be formed of the same metal configuration.
- the gate wiring resistance can be further reduced.
- the third gate-intensive wiring and the gate pad may be formed of a material thicker than the first and second gate-intensive wiring.
- the gate wiring resistance can be further reduced.
- the semiconductor device may further include a source pad connecting portion, and adjacent source pads in the plurality of source pads may be electrically connected to each other via the source pad connecting portion.
- the Cgs / Cgd ratio (that is, the ratio of the gate-drain capacitance Cgd to the gate-source capacitance Cgs) can be improved while reducing the resistance of the entire gate wiring, and self-turn-on can be suppressed. ..
- the source pad, the drain pad, and the gate pad may be substantially the same height with respect to the substrate.
- the degree of freedom in arranging the gate wire can be improved.
- the source pad may be a pad for bonding the bonding wire.
- the manufacturing process can be simplified.
- the source pad, the drain pad, and the gate pad may be substantially the same height with respect to the substrate.
- the gate-intensive wiring may have a plurality of slits.
- the width of the slit is 0.1 ⁇ m to 3.0 ⁇ m in the longitudinal direction, the distance between the slits is 1 ⁇ m to 10 ⁇ m, and the width of the slit is 3 ⁇ m to 3 ⁇ m in the first direction. It may be 40 ⁇ m and the slit spacing may be 1.0 ⁇ m to 10 ⁇ m.
- FIG. 6A is a plan view of the nitride semiconductor device of the second embodiment.
- FIG. 6B is a cross-sectional view taken along the line VIb-VIb in FIG. 6A.
- a buffer layer 602 (for example, GaN, AlGaN, which is a group III nitride semiconductor) is placed on a substrate 601 (for example, a substrate such as Si, Sapphire, SiC, GaN, AlN, etc.).
- a first nitride semiconductor layer 603 (in addition, for example, Group III nitride semiconductors such as InGaN, AlGaN, AlInGaN, etc.) having a single layer or a plurality of layers such as AlN, InGaN, AlInGaN, etc.
- a second nitride semiconductor layer 604 made of AlGaN (in addition, for example, GaN, InGaN, AlGaN, AlN, AlInGaN, which are Group III nitride semiconductors, etc.). May be good) is formed.
- the second nitride semiconductor layer 604 has a larger bandgap than the first nitride semiconductor layer 603.
- the AlGaN / GaN interface is due to the effects of piezopolarization and spontaneous polarization generated from the lattice constant difference between AlGaN and GaN.
- a high-concentration two-dimensional electron gas (2DEG) layer (not shown) is formed on the GaN layer side in the vicinity.
- the region where this two-dimensional electron gas is formed is the active region 608 of FIG. 6A.
- the active region 608 includes a long finger portion having a long finger length of the transistor and a short finger portion having a short finger length of the transistor.
- a source electrode 605 and a drain electrode 606 are separately formed on the second nitride semiconductor layer 604.
- the source electrode 605 and the drain electrode 606 are made of metals such as Ti, Al, Mo, and Hf that are in ohmic contact with any one of the two-dimensional electron gas layer, the second nitride semiconductor layer 604, and the first nitride semiconductor layer 603.
- the gate electrode 607 is formed on the second nitride semiconductor layer 604 between the source electrode 605 and the drain electrode 606.
- the gate electrode 607 may be an electrode in which one or two or more metals such as Ti, Ni, Pd, Pt, Au, W, WSi, Ta, TiN, Al, Mo, Hf, and Zr are combined.
- P-type nitride containing p-type impurities (Mg, Zn, C, etc.) between at least one of the source electrode 605, the drain electrode 606, and the gate electrode 607 and the second nitride semiconductor layer 604.
- a physical semiconductor layer may be formed, and at least one of the source electrode 605, the drain electrode 606, and the gate electrode 607 is in direct contact with the p-type nitride semiconductor layer and the second nitride semiconductor layer 604. It may be formed so as to (not shown).
- a source outlet wiring 609 and a drain outlet wiring 610 made of, for example, Au or Al are formed on the source electrode 605 and the drain electrode 606, respectively.
- a finger-shaped source electrode having a long finger length in the long finger portion and a short finger length in the short finger portion on the second nitride semiconductor layer.
- the 605 and the drain electrode 606 are separated from each other.
- a finger-shaped gate electrode 607 having a long finger length in the long finger portion and a short finger length in the short finger portion is formed between the source electrode 605 and the drain electrode 606, and the drain electrode 606 provides a drain lead-out wiring 610. It is connected to the drain pad 613 via.
- the source electrode 605 is electrically connected to the plurality of source pads 612 via the source lead-out wiring 609 and the source aggregation wiring extending in the first direction.
- the source-aggregated wiring is electrically connected to the source electrodes 605 of both the long-finger portion and the short-finger portion, and at the boundary between the long-finger portion and the short-finger portion, the source-aggregate wiring surrounds the outer periphery of the active region 608 of the long-finger portion. It is formed so as to extend.
- the gate electrode 607 is provided via a first gate aggregate wiring 617 extending in the first direction, a plurality of second gate aggregation wirings 618, and a third gate aggregation wiring 619 extending in the first direction. It is electrically connected to the gate pads 614 located at both ends or one end of the gate aggregate wiring 619 of 3, and the plurality of source pads 612 and the second gate aggregation wiring 618 are alternately formed in the first direction.
- the first gate aggregate wiring 617 is electrically connected to the gate electrodes 607 of both the long finger portion and the short finger portion, and the first gate aggregation is performed at the boundary between the long finger portion and the short finger portion, similarly to the source aggregation wiring.
- the wiring 617 is formed so as to extend so as to surround the outer periphery of the active region 608 of the long finger portion.
- the wiring width of each second gate aggregate wiring 618 in the first direction can be preferably 50 ⁇ m to 1000 ⁇ m.
- the gate electrode 607, the first gate aggregated wiring 617, the second gate aggregated wiring 618, and the third gate aggregated wiring 619 may be simultaneously formed of the same metal configuration.
- an ESD protection element 620 using a transistor type diode is formed in the vicinity of the gate pad 614 to prevent ESD destruction.
- the source aggregation wiring, the ESD protection element 620, and the gate pad 614 are arranged in this order from the short finger portion in the direction opposite to the finger direction, and are electrically connected to the anode 621 source aggregation wiring of the ESD protection element 620 to protect the ESD. It is electrically connected to the cathode 622 gate pad 614 of the element 620.
- the source outlet wiring 609 and the drain outlet wiring 610 play a role of drawing current and / or voltage from the source electrode 605 and the drain electrode 606 of the finger portion of the active region 608, respectively.
- the first to third gate aggregate wirings 617, 618, 619 and the source aggregation wiring 615 play a role of consolidating the current and / or voltage drawn from the gate electrode 607 and the source extraction wiring 609, respectively.
- the source pad 612, the drain pad 613 and the gate pad 614 are electrically connected to the electric contact on the lead of the lead frame via the bonding wire.
- a gate current is supplied from the gate pad to the gate electrode in the active region via a single thin and thin gate aggregate wiring extending in the first direction.
- the gate current can be supplied through the plurality of second gate aggregate wiring 618 and the wide third gate aggregation wiring 619 extending in the first direction, the gate current from the gate pad 614 to the gate electrode 607 can be supplied.
- the electrical resistance is reduced and a larger gate current can be supplied.
- the chip size can be further reduced while further reducing the gate aggregation wiring resistance. Since the following configuration examples of the gate-intensive wiring are the same as those in the first embodiment, the description thereof will be omitted.
- the semiconductor device includes a substrate, a first nitride semiconductor layer on the substrate, a second nitride semiconductor layer on the first nitride semiconductor layer, and the above.
- a third gate-aggregated wiring, an active region, and an ESD protection element are provided, the drain electrode is electrically connected to the drain pad via the drain extraction wiring, and the source electrode is the source extraction wiring.
- the gate electrode is electrically connected to the plurality of source pads via the source aggregation wiring, and the gate electrode is the first gate aggregation wiring, the plurality of second gate aggregation wiring, and the third gate aggregation wiring.
- the active region is provided with a long finger portion and a short finger portion, and the source aggregation wiring, the ESD protection element, and the gate pad are arranged in this order at a position in the longitudinal direction from the short finger portion.
- the anode of the ESD protection element is electrically connected to the source aggregation wiring, and the cathode of the ESD protection element is electrically connected to the gate pad.
- the gate wiring resistance can be reduced and high-speed switching operation can be facilitated.
- the source-intensive wiring that supplies power to the ESD protection element can be reduced, and the chip size can be reduced.
- FIG. 7A is a plan view of the nitride semiconductor device of the third embodiment.
- 7B is a cross-sectional view of FIG. 7A.
- a buffer layer 702 (for example, GaN, AlGaN, which is a group III nitride semiconductor) is placed on a substrate 701 (for example, a substrate such as Si, Sapphire, SiC, GaN, AlN, etc.).
- a first nitride semiconductor layer 703 (in addition, for example, Group III nitride semiconductors such as InGaN, AlGaN, AlInGaN, etc.) having a single layer or a plurality of layers such as AlN, InGaN, AlInGaN, etc.
- a second nitride semiconductor layer 704 made of AlGaN (in addition, for example, GaN, InGaN, AlGaN, AlN, AlInGaN, which are Group III nitride semiconductors, etc.). May be good) is formed.
- the second nitride semiconductor layer 704 has a larger bandgap than the first nitride semiconductor layer 703.
- the AlGaN / GaN interface is due to the effects of piezopolarization and spontaneous polarization generated from the lattice constant difference between AlGaN and GaN.
- a high-concentration two-dimensional electron gas (2DEG) layer (not shown) is formed on the GaN layer side in the vicinity.
- the region where this two-dimensional electron gas is formed is the active region 708 of FIG. 7A.
- a source electrode 705 and a drain electrode 706 are separately formed on the second nitride semiconductor layer 704.
- the source electrode 705 and the drain electrode 706 are made of metals such as Ti, Al, Mo, and Hf that are in ohmic contact with any one of the two-dimensional electron gas layer, the second nitride semiconductor layer 704, and the first nitride semiconductor layer 703. It may be composed of one or a combination of two or more electrodes and electrically connected to the two-dimensional electron gas layer of the active region 708.
- the second nitride semiconductor layer 704 may be formed by using a known ohmic recess technique (not shown). , May be in contact with a part of the first nitride semiconductor layer 703.
- the gate electrode 707 is formed on the second nitride semiconductor layer 704 between the source electrode 705 and the drain electrode 706.
- the gate electrode 707 may be an electrode in which one or two or more metals such as Ti, Ni, Pd, Pt, Au, W, WSi, Ta, TiN, Al, Mo, Hf, and Zr are combined.
- P-type nitride containing p-type impurities (Mg, Zn, C, etc.) between at least one of the source electrode 705, the drain electrode 706, and the gate electrode 707 and the second nitride semiconductor layer 704.
- a physical semiconductor layer may be formed, and at least one of the source electrode 705, the drain electrode 706, and the gate electrode 707 is in direct contact with the p-type nitride semiconductor layer and the second nitride semiconductor layer 704. It may be formed so as to (not shown).
- a source outlet wiring 709 and a drain outlet wiring 710 made of, for example, Au or Al are formed on the source electrode 705 and the drain electrode 706, respectively.
- a finger-shaped source electrode 705 and a drain electrode 706 are separately formed on the second nitride semiconductor layer, and between the source electrode 705 and the drain electrode 706.
- a finger-shaped gate electrode 707 is formed in the drain electrode 706, and the drain electrode 706 is connected to the drain pad 713 via the drain lead-out wiring 710.
- the source electrode 705 is electrically connected to a plurality of source pads 712 via the source lead-out wiring 709 and the source aggregation wiring 715 extending in the first direction.
- the gate electrode 707 is provided via a first gate aggregate wiring 717 extending in the first direction, a plurality of second gate aggregation wirings 718, and a third gate aggregation wiring 719 extending in the first direction. It is electrically connected to the gate pads 714 located at both ends or one end of the gate aggregate wiring 719 of 3, and the plurality of source pads 712 and the second gate aggregation wiring 718 are alternately formed in the first direction.
- the wiring width of each second gate aggregate wiring 718 in the first direction can be preferably 50 ⁇ m to 7000 ⁇ m.
- the gate electrode 707, the first gate aggregated wiring 717, the second gate aggregated wiring 718, and the third gate aggregated wiring 719 may be simultaneously formed of the same metal configuration.
- an ESD protection element 720 by a transistor type diode is formed in the vicinity of the gate pad 714 to prevent ESD destruction.
- the ESD protection element 720 is electrically connected to the anode 721 source aggregate wiring and electrically connected to the cathode 722 gate aggregation wiring.
- the cathode 722 is electrically connected to the third gate-aggregated wiring 719, but is electrically connected to at least one of the first, second, or third gate-aggregating wirings 717, 718, and 719. It may be connected.
- the source outlet wiring 709 and the drain outlet wiring 710 play a role of drawing current and / or voltage from the source electrode 705 and the drain electrode 706 of the finger portion of the active region 708, respectively.
- the first to third gate aggregate wirings 717, 718, 719 and the source aggregation wiring 715 play a role of consolidating the current and / or voltage drawn from the gate electrode 707 and the source extraction wiring 709, respectively.
- the source pad 712, the drain pad 713 and the gate pad 714 are electrically connected to the electric contacts on the leads of the lead frame via the bonding wire.
- a gate current is supplied from the gate pad to the gate electrode in the active region via a single thin and thin gate aggregate wiring extending in the first direction.
- the gate current can be supplied through the plurality of second gate aggregate wiring 718 and the wide third gate aggregation wiring 719 extending in the first direction, the gate pad 714 to the gate electrode 707 can be supplied.
- the electrical resistance is reduced and a larger gate current can be supplied.
- the ESD protection element 720 between each second gate aggregate wiring 718 and each source pad 712, the inactive region can be saved in space, and the chip can be further reduced in gate aggregate wiring resistance. The size can be further reduced. Since the following configuration examples of the gate-intensive wiring are the same as those in the first embodiment, the description thereof will be omitted.
- the semiconductor device includes a substrate, a first nitride semiconductor layer on the substrate, a second nitride semiconductor layer on the first nitride semiconductor layer, and the above.
- a source-aggregated wire extending in one direction, a gate pad, a first gate-aggregated wire extending in the first direction, a plurality of second gate-aggregated wires, and a third gate extending in the first direction. It comprises an aggregated wiring, an active region, and an ESD protection element, the drain electrode is electrically connected to the drain pad via the drain outlet wiring, and the source electrode is the source extraction wiring and the said. It is electrically connected to the plurality of source pads via the source aggregation wiring, and the gate electrode is the first gate aggregation wiring, the plurality of second gate aggregation wiring, and the third gate aggregation wiring.
- the source pad and the gate aggregated wiring are electrically connected to the gate pad located at both ends or one end of the third gate aggregated wiring via the wiring, and the source pad and the gate aggregated wiring are alternately formed in the first direction.
- the ESD protection element is arranged between the second gate-intensive wiring and the plurality of source pads.
- the gate wiring resistance can be reduced and high-speed switching operation can be facilitated.
- the source-intensive wiring that supplies power to the ESD protection element can be reduced, and the chip size can be reduced.
- FIG. 8A is a cross-sectional view of the semiconductor component of the fourth embodiment.
- FIG. 8B is a bottom view.
- the semiconductor chip 825 according to the first to third embodiments is fixed to a die pad portion (a place where the chip is mounted) of the lead frame 827, and the source pad 812 and the source terminal 832 of the lead frame 827, and the gate of the gate pad 814 and the lead frame 827.
- the terminal 834, the drain pad 813, and the drain terminal 833 of the lead frame 827 are electrically connected via the bonding wire 826, respectively.
- the semiconductor component is formed by individualizing the semiconductor chip 825 according to the first to third embodiments through a back surface polishing step and a dicing step, and then fixing the semiconductor chip 825 onto the die pad of the lead frame 827 using a conductive paste-like adhesive. It is formed by bonding a wire to a semiconductor pad and lead and sealing it with an epoxy resin molding material.
- the die attach material 828 may be a conductive paste-like adhesive such as solder paste or silver paste, or may be a non-conductive paste-like adhesive using a resin-based material such as epoxy or polymide.
- the metal material of the bonding wire 826 may be any one of Au, Cu, Al alloy, pure Al, and others, or a combination thereof.
- the bonding method may be any one of ball bonding, wedge bonding, etc., or a combination thereof.
- the form of the bonding member may be any one of a thin wire, a thick wire, a ribbon, a clip, and the like, or a combination thereof.
- the form of the surface mount type (surface unit device, SMD) package is shown, but the lead insertion type (through hole device, THD) package may be used. Further, there are a plurality of source terminals and one gate terminal, and a plurality of source terminals and one gate terminal may be arranged side by side in the same order.
- the semiconductor component according to the fourth embodiment includes the above-mentioned semiconductor device and a lead frame
- the lead frame includes a die pad portion to which the semiconductor device is fixed, a source terminal, and a gate terminal. It has a drain terminal, and the source pad and the source terminal, the gate pad and the gate terminal, and the drain pad and the drain terminal are electrically connected via a bonding wire, respectively.
- the gate wiring resistance can be reduced and high-speed switching operation can be facilitated.
- the chip size can be reduced and semiconductor parts can be miniaturized.
- the semiconductor component is any one of SMD (surface mount device, surface mount type element) and THD (Through-Hole Device, through-hole type element), and there are a plurality of source terminals and the gate terminal. Is one, and the semiconductor component in which the plurality of source terminals and one gate terminal are arranged side by side in the same order is SMD (surface mount device, surface mount type element), THD (Through-Hole Device). , Through-hole type element), there are a plurality of source terminals, there is one gate terminal, and the plurality of source terminals and one gate terminal are arranged in the same order. It may be arranged.
- FIG. 9 is a cross-sectional view of the semiconductor component of the fifth embodiment.
- the semiconductor chip 925 according to the first to third embodiments is adhered to the die pad portion, and the source terminal of the source pad 912 and the lead frame 927, the gate terminal of the gate pad 914 and the lead frame 927, and the drain terminal of the drain pad 913 and the lead frame 927. Are electrically connected via bumps 929, respectively.
- the material of the bump 929 may be any one of Ni, Cu, SnAg, Au, Al, and others, or a combination thereof. Further, there are a plurality of source terminals and one gate terminal, and a plurality of source terminals and one gate terminal may be arranged side by side in the same order.
- the semiconductor component according to the fifth embodiment includes the above-mentioned semiconductor device, a lead frame having a source terminal, a gate terminal, and a drain terminal, and includes the source pad, the source terminal, and the gate pad.
- the gate terminal, the drain pad, and the drain terminal are electrically connected to each other via bumps.
- the gate wiring resistance can be reduced and high-speed switching operation can be facilitated.
- the chip size can be reduced and semiconductor parts can be miniaturized.
- the present disclosure is not limited to this embodiment. As long as it does not deviate from the gist of the present disclosure, various modifications that can be conceived by those skilled in the art are applied to this embodiment, and a form constructed by combining components in different embodiments is also within the scope of one or more embodiments. May be included within.
- the semiconductor device can be used as a switching transistor that operates at a high frequency of 1 MHz or more. Among them, it is particularly applicable to GaN power transistors.
Abstract
Description
図1Aは実施形態1の窒化物半導体装置の平面図である。図1Bは図1Aにおける、Ib-Ib線の断面図である。
図6Aは実施形態2の窒化物半導体装置の平面図である。図6Bは図6Aにおける、VIb-VIb線の断面図である。
図7Aは実施形態3の窒化物半導体装置の平面図である。図7Bは図7Aの断面図である。
図8Aは実施形態4の半導体部品の断面図である。図8Bは底面図である。実施形態1~3に記載の半導体チップ825がリードフレーム827のダイパッド部(チップをマウントする場所)に固着され、ソースパッド812とリードフレーム827のソース端子832、ゲートパッド814とリードフレーム827のゲート端子834、ドレインパッド813とリードフレーム827のドレイン端子833が、それぞれボンディングワイヤ826を介して電気的に接続されている。
図9は実施形態5の半導体部品の断面図である。実施形態1~3に記載の半導体チップ925がダイパッド部に接着され、ソースパッド912とリードフレーム927のソース端子、ゲートパッド914とリードフレーム927のゲート端子、ドレインパッド913とリードフレーム927のドレイン端子が、それぞれバンプ929を介して電気的に接続されている。
102、602、702 バッファ層
103、603、703 第1の窒化物半導体層
104、604、704 第2の窒化物半導体層
105、605、705 ソース電極
106、606、706 ドレイン電極
107、607、707 ゲート電極
108、608、708 活性領域
109、609、709 ソース引き出し配線
110、610、710 ドレイン引き出し配線
112、212、312、412、612、712 ソースパッド
113、213、413、613、713 ドレインパッド
114、214、414、614、714 ゲートパッド
115、215、315、615、715 ソース集約配線
117、217、517、617、717 第1のゲート集約配線
118、218、318、518、618、718 第2のゲート集約配線
119、219、519、619、719 第3のゲート集約配線
120、620、720 ESD保護素子
324 ソースパッド連結部
621、721 アノード
622、722 カソード
523 スリット
825、925 半導体チップ
826 ボンディングワイヤ
827 リードフレーム
828 ダイアタッチ材
929 バンプ
630 長フィンガー部
631 短フィンガー部
832 ソース端子
833 ドレイン端子
834 ゲート端子
Claims (14)
- 基板と、
前記基板上の第1の窒化物半導体層と、
前記第1の窒化物半導体層上の第2の窒化物半導体層と、
前記第2の窒化物半導体層上のフィンガー状のソース電極と、
前記第2の窒化物半導体層上に、前記ソース電極と離隔して配置されたフィンガー状のドレイン電極と、
前記ソース電極と前記ドレイン電極の間に配置されたフィンガー状のゲート電極と、
ドレインパッドと、
ドレイン引き出し配線と、
複数のソースパッドと、
ソース引き出し配線と、
前記基板の平面視においてフィンガー状の前記ゲート電極の長手方向と垂直な第1方向に延伸するソース集約配線と、
ゲートパッドと、
前記第1方向に延伸する第1のゲート集約配線と、
複数の第2のゲート集約配線と、
前記第1方向に延伸する第3のゲート集約配線と、を備え、
前記ドレイン電極は、前記ドレイン引き出し配線を介して前記ドレインパッドに電気的に接続され、
前記ソース電極は、前記ソース引き出し配線と、前記ソース集約配線とを介して前記複数のソースパッドに電気的に接続され、
前記ゲート電極は、前記第1のゲート集約配線と、前記複数の第2のゲート集約配線と、前記第3のゲート集約配線とを介して、前記第3のゲート集約配線の両端または一端に位置する前記ゲートパッドに電気的に接続され、
前記複数のソースパッドと前記複数の第2のゲート集約配線は前記第1方向に交互に形成されている、
半導体装置。 - 前記ゲート電極、前記第1のゲート集約配線、前記第2のゲート集約配線、前記第3のゲート集約配線は、同一の金属構成で形成されている、
請求項1に記載の半導体装置。 - 前記第3のゲート集約配線および前記ゲートパッドが、前記第1および第2のゲート集約配線より厚い材料で形成される、
請求項1または2に記載の半導体装置。 - さらに、ソースパッド連結部を備え、
前記複数のソースパッドにおいて隣り合うソースパッド同士が、前記ソースパッド連結部を介して電気的に接続される、
請求項1~3のいずれか1項に記載の半導体装置。 - 前記ゲートパッドが、前記複数のソースパッドの並び方向ではなく前記長手方向にずれた位置にある、
請求項1~4のいずれか1項に記載の半導体装置。 - 前記ソースパッドが、ボンディングワイヤをボンディングするためのパッドである、
請求項1~5のいずれか1項に記載の半導体装置。 - 前記ソースパッドと前記ドレインパッドと前記ゲートパッドとが、前記基板に対して実質的に同じ高さである、
請求項1~6のいずれか1項に記載の半導体装置。 - 前記ゲート集約配線は、複数のスリットを有する、
請求項1~7のいずれか1項に記載の半導体装置。 - 前記半導体装置の平面視で、前記長手方向において、前記スリットの幅が0.1μm~3.0μm、前記スリットの間隔が1μm~10μmであり、前記第1方向において、前記スリットの幅が3μm~40μm、前記スリットの間隔が1.0μm~10μmである、
請求項8に記載の半導体装置。 - 基板と、
前記基板上の第1の窒化物半導体層と、
前記第1の窒化物半導体層上の第2の窒化物半導体層と、
前記第2の窒化物半導体層の上のフィンガー状のソース電極と、
前記第2の窒化物半導体層上に、前記ソース電極と離隔して配置されたフィンガー状のドレイン電極と、
前記ソース電極と前記ドレイン電極の間に配置されたフィンガー状のゲート電極と、
ドレインパッドと、
ドレイン引き出し配線と、
複数のソースパッドと、
ソース引き出し配線と、
前記基板の平面視においてフィンガー状の前記ゲート電極の長手方向と垂直な第1方向に延伸するソース集約配線と、
ゲートパッドと、
前記第1方向に延伸する第1のゲート集約配線と、
複数の第2のゲート集約配線と、
前記第1方向に延伸する第3のゲート集約配線と、
活性領域と、
ESD保護素子と、を備え、
前記ドレイン電極は前記ドレイン引き出し配線を介して前記ドレインパッドに電気的に接続され、
前記ソース電極は、前記ソース引き出し配線と、前記ソース集約配線とを介して前記複数のソースパッドに電気的に接続され、
前記ゲート電極は、前記第1のゲート集約配線と、複数の第2のゲート集約配線と、前記第3のゲート集約配線とを介して、前記第3のゲート集約配線の両端または一端に位置する前記ゲートパッドに電気接続され、
前記複数のソースパッドと前記複数の第2のゲート集約配線は前記第1方向に交互に形成され、
前記活性領域が長フィンガー部と短フィンガー部とを備え、
前記短フィンガー部から前記長手方向の位置に前記ソース集約配線、前記ESD保護素子、前記ゲートパッドがこの順序で配置され、
前記ESD保護素子のアノードが前記ソース集約配線に電気的に接続され、
前記ESD保護素子のカソードが前記ゲートパッドに電気的に接続されている、
半導体装置。 - 基板と、
前記基板上の第1の窒化物半導体層と、
前記第1の窒化物半導体層上の第2の窒化物半導体層と、
前記第2の窒化物半導体層上のフィンガー状のソース電極と、
前記第2の窒化物半導体層上に、前記ソース電極と離隔して配置されたドレイン電極と、
前記ソース電極と前記ドレイン電極の間に配置されたフィンガー状のゲート電極と、
ドレインパッドと、
ドレイン引き出し配線と、
複数のソースパッドと、
ソース引き出し配線と、
前記基板の平面視においてフィンガー状の前記ゲート電極の長手方向と垂直な第1方向に延伸するソース集約配線と、
ゲートパッドと、
前記第1方向に延伸する第1のゲート集約配線と、
複数の第2のゲート集約配線と、
前記第1方向に延伸する第3のゲート集約配線と、
活性領域と、
ESD保護素子と、を備え、
前記ドレイン電極は、前記ドレイン引き出し配線を介して前記ドレインパッドに電気的に接続され、
前記ソース電極は、前記ソース引き出し配線と、前記ソース集約配線とを介して前記複数のソースパッドに電気的に接続され、
前記ゲート電極は、前記第1のゲート集約配線と、前記複数の第2のゲート集約配線と、前記第3のゲート集約配線とを介して、前記第3のゲート集約配線の両端または一端に位置する前記ゲートパッドに電気接続され、
前記ソースパッドと前記ゲート集約配線は前記第1方向に交互に形成され、
前記複数の第2のゲート集約配線と、前記複数のソースパッドとの間に前記ESD保護素子がそれぞれ配置されている、
半導体装置。 - 請求項1から11のいずれか1項に記載の半導体装置と、
リードフレームとを備え、
前記リードフレームは、前記半導体装置が固着されるダイパッド部と、ソース端子と、ゲート端子と、ドレイン端子とを有し、
前記ソースパッドと前記ソース端子、前記ゲートパッドと前記ゲート端子、前記ドレインパッドと前記ドレイン端子とが、それぞれボンディングワイヤを介して電気的に接続されている、
半導体部品。 - 前記半導体部品はSMD(surface mount device、表面実装型素子)、THD(Through-Hole Device、スルーホール型素子)のうちのいずれか1つであり、前記ソース端子は複数あり、前記ゲート端子は1つであり、
複数の前記ソース端子と、1つの前記ゲート端子とが同順に並んで配置されている、
請求項12に記載の半導体部品。 - 請求項1から11のいずれか1項に記載の半導体装置と、
ソース端子、ゲート端子、および、ドレイン端子を有するリードフレームとを備え、
前記ソースパッドと前記ソース端子、前記ゲートパッドと前記ゲート端子、前記ドレインパッドと前記ドレイン端子とが、それぞれバンプを介して電気的に接続されている、
半導体部品。
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