WO2015129415A1 - 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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- WO2015129415A1 WO2015129415A1 PCT/JP2015/053098 JP2015053098W WO2015129415A1 WO 2015129415 A1 WO2015129415 A1 WO 2015129415A1 JP 2015053098 W JP2015053098 W JP 2015053098W WO 2015129415 A1 WO2015129415 A1 WO 2015129415A1
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- semiconductor device
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- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L24/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L24/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L24/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/73—Means for bonding being of different types provided for in two or more of groups H01L24/10, H01L24/18, H01L24/26, H01L24/34, H01L24/42, H01L24/50, H01L24/63, H01L24/71
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/13—Discrete devices, e.g. 3 terminal devices
- H01L2924/1304—Transistor
- H01L2924/1306—Field-effect transistor [FET]
- H01L2924/13091—Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
Definitions
- the present invention relates to a semiconductor device, and relates to a semiconductor device using wire bonding.
- a semiconductor chip and other semiconductor chips or inner leads are electrically connected by wire bonding using a metal wire.
- a metal wire is bonded to a semiconductor chip, there is a concern about a load on the semiconductor chip.
- Patent Document 1 discloses a method of avoiding wire bonding to a power semiconductor element by wire bonding a metal wire to a chip electrode.
- the power semiconductor device disclosed in Patent Document 1 uses an aluminum wire for wire bonding in order to cope with a large current, and is wire-bonded by ultrasonic waves or heat.
- a method of forming a chip electrode (bonding pad) on the power semiconductor element has been proposed.
- JP 2004-140072 Japanese Patent Publication “JP 2004-140072 (published May 13, 2004)”
- the direction in which the wire is stretched matches the direction in which ultrasonic vibration is applied.
- the vibration direction of the ultrasonic vibration and the longitudinal direction of the lower layer metal in the power semiconductor element are nearly perpendicular, stress is applied to the power semiconductor element through the bonding pad during bonding.
- the present invention has been made to solve the above problems, and an object of the present invention is to realize a manufacturing method that suppresses the occurrence of cracks in a semiconductor element during manufacturing of a semiconductor device by a simple method.
- a method for manufacturing a semiconductor device includes ultrasonic waves for bonding wires to an upper metal layer formed over a semiconductor element while applying ultrasonic vibrations to the wires.
- a semiconductor device manufacturing method including a bonding step, wherein the semiconductor element has a lower layer metal formed under the upper layer metal, and ultrasonic vibration is applied to the wire in the ultrasonic bonding step. The ultrasonic vibration is applied so that an angle ⁇ formed by the direction in which the first metal layer is formed and the longitudinal direction of the lower layer metal satisfies 0 ° ⁇ ⁇ ⁇ 45 °.
- FIG. 5 is a view for explaining the method for manufacturing the semiconductor device according to the first embodiment of the present invention, and is a cross-sectional view taken along line AA in FIG.
- A is a top view which shows the structure of the semiconductor device which concerns on Embodiment 1 of this invention
- (b) is a side view of (a).
- A It is a top view of the GaN-type power device of the semiconductor device which concerns on Embodiment 1 of this invention
- (b) is a figure for demonstrating a contact electrode part, and the arrow view of the AA line of (a)
- It is a perspective view which shows a cross section. It is a perspective view of the contact electrode part of the semiconductor device which concerns on Embodiment 1 of this invention.
- (A) is a top view of the contact electrode of the semiconductor device which concerns on Embodiment 1 of this invention
- (b) is a figure explaining the angle
- (A)-(f) is a top view of the bonding pad part of the semiconductor device which concerns on Embodiment 3 of this invention.
- Embodiment 1 A method for manufacturing a semiconductor device 50 and the semiconductor device 50 according to Embodiment 1 of the present invention will be described with reference to FIGS.
- FIG. 2A is a plan view showing the configuration of the semiconductor device 50 according to the first embodiment of the present invention.
- FIG. 2B is a side view of FIG.
- the semiconductor device 50 includes a GaN-based power device 1 (semiconductor element, GaN-based semiconductor element), a bonding pad portion 2 (upper layer metal), and an aluminum wire 3. (Aluminum wire), MOS-FET 51, fin portion 52, gold wire 53, inner lead portion 55, solder 56, silver paste 57, and die pad portion 58 are provided.
- the GaN-based power device 1 is mounted on the die pad portion 58 via a silver paste 57.
- the GaN-based power device 1 and the MOS-FET 51 are electrically connected by an aluminum wire 3 via a bonding pad portion 2.
- the GaN-based power device 1 and the inner lead portion 55 are electrically connected by the aluminum wire 3 through the bonding pad portion 2.
- the bonding pad portion 2 allows the current collected from the GaN-based power device 1 to flow to the inner lead portion 55 or the MOS-FET 51 through the aluminum wire 3.
- the MOS-FET 51 is mounted on the die pad portion 58 via the solder 56. Further, the MOS-FET 51 is electrically connected to the inner lead portion 55 by a gold wire 53. For example, the MOS-FET 51 transmits a signal to the GaN-based power device 1 based on a signal from the inner lead portion 55.
- the inner lead portion 55 is electrically connected to the outer lead portion 54.
- the outer lead portion 54 is connected to the inner lead portion 55. Further, some outer lead portions 54 are directly connected to the die pad portion 58.
- the outer lead portion 54 electrically connects the GaN-based power device 1 or the MOS-FET 51 and, for example, an external circuit via the inner lead portion 55.
- the outer lead portion 54 electrically connects the die pad portion 58 and, for example, an external circuit.
- the fin portion 52 is formed integrally with the die pad portion 58 and is provided so as to be exposed to the outside of a resin mold (not shown).
- the resin mold includes, for example, the GaN-based power device 1, the bonding pad portion 2, the aluminum wire 3, the MOS-FET 51, the gold wire 53, the inner lead portion 55, the solder 56, the silver paste 57, the die pad portion 58, and the outer lead. It is formed so as to cover one end of the portion 54.
- the fin portion 52 is provided for releasing heat generated by the GaN-based power device 1 and the MOS-FET 51 arranged in the die pad portion 58 to the outside.
- the die pad portion 58 is formed with a thickness of about 1.27 mm.
- the MOS-FET 51 is mounted via a Pb—Ag—Cu-based high melting point solder 56 (about 40 W / m ⁇ K).
- the GaN-based power device 1 is mounted on the die pad portion 58 via a silver paste 57 (about 10 W / m ⁇ K).
- the aluminum wire 3 and the gold wire 53 are used. ing.
- a gold wire 53 having a diameter of 30 ⁇ m is used for a portion (such as a part of the electrical connection between the MOS-FET 51 and the GaN-based power device 1) that is used for signal transmission and the like and has only a small current.
- FIG. 1 is a view for explaining the method for manufacturing the semiconductor device 50 and is a cross-sectional view taken along the line AA in FIG. 3A is a plan view of the GaN-based power device 1 of the semiconductor device 50, and FIG. 3B is a diagram for explaining the contact electrode portion 4, and FIG. It is a perspective view which shows the cross section of the AA of FIG.
- the contact electrode portion 4 there are a plurality of contact electrode portions 4, which are formed on the electronic functional element 8 so as to be parallel to each other.
- the insulating layer 7 is formed so as to cover the electronic functional element 8 and the contact electrode portion 4.
- the bonding pad portion 2 is formed so as to cover the insulating layer 7.
- the bonding pad portion 2 is on the upper side with respect to the electronic functional element 8.
- FIG. 3A and FIG. 5A to be described later the contact electrode portion 4 is covered with the insulating layer 7 and the contact electrode portion 4 cannot be seen. Is indicated by a dotted line.
- the contact electrode portion 4 is electrically connected to the electronic functional element 8.
- the contact electrode portion 4 is electrically connected to the bonding pad portion 2 at a predetermined position.
- the contact electrode unit 4 includes a first electrode 41 and a second electrode 42.
- the first electrode 41 is formed to extend in the longitudinal direction of the GaN-based power device 1 (the front and back direction in FIG. 1).
- the cross section obtained by cutting the first electrode 41 perpendicularly to the longitudinal direction of the GaN-based power device 1 is substantially U-shaped with a downward convex portion as shown in FIG.
- the first electrode 41 has flange portions 41 a that protrude outward at two locations on the upper end.
- the first electrode 41 is a thin film (for example, having a thickness of about 100 nm) formed of, for example, gold or titanium, and functions as a barrier metal in the compound semiconductor in the GaN-based power device 1.
- the second electrode 42 (lower layer metal) is formed so as to extend in the longitudinal direction of the GaN-based power device 1 along the first electrode 41.
- the cross section obtained by cutting the second electrode 42 perpendicularly to the longitudinal direction of the GaN-based power device 1 is a substantially U-shape having a downward convex portion as shown in FIG.
- the second electrode 42 has a groove 6a.
- the portion where the contact electrode portion 4 and the bonding pad portion 2 are electrically connected has a groove portion 6b.
- the second electrode 42 has flange portions 42 a that protrude outward at two locations on the upper end.
- the first electrode 41 is formed such that a part of the first electrode 41 is embedded on the electronic functional element 8.
- the outer bottom surface and a part of the outer side surface of the second electrode 42 are in contact with the substantially U-shaped inner surface of the first electrode 41 in the cross section shown in FIG.
- the second electrode 42 is formed to be thicker than the first electrode 41.
- the bonding pad portion 2 (upper layer metal) has a first concave portion 2a, a second concave portion 2b, and a first convex portion 2c. Furthermore, the bonding pad portion 2 has a connection portion 5 at a location where the bonding pad portion 2 and the contact electrode portion 4 are electrically connected.
- the connection part 5 has the 2nd convex part 5a and the 3rd convex part 5b.
- the bonding pad portion 2 is provided for bonding the aluminum wire 3 (wire bonding). Furthermore, the bonding pad part 2 collects the current from the contact electrode part 4 in the GaN-based power device 1.
- the first recess 2a is formed on the upper surface of the bonding pad portion 2 and above the groove 6a.
- the first convex portion 2 c is formed on the lower surface of the bonding pad portion 2 and above the groove portion 6 a.
- the first convex portion 2c is formed so as to protrude downward.
- the 1st recessed part 2a and the 1st convex part 2c are formed along the groove part 6a. Since the groove portion 6a has a concave shape, the insulating layer 7 and the bonding pad portion 2 stacked on the groove portion inevitably have a concave shape, so that the bonding pad portion 2 has a first concave portion 2a and a first convex portion 2c. .
- the second concave portion 2 b is formed on the upper surface of the bonding pad portion 2 at the upper portion where the contact electrode portion 4 and the bonding pad portion 2 are electrically connected, that is, the upper portion of the connecting portion 5.
- the connecting portion 5 forms a groove portion 6 b by, for example, etching a hole in the insulating layer 7 at a position where the contact electrode portion 4 and the bonding pad portion 2 are electrically connected. After that, the bonding pad portion 2 is formed at the same time. For this reason, the depth of the recess of the second recess 2b is formed deeper than the depth of the recess of the first recess 2a.
- the second convex portion 5a is formed on the lower surface of the bonding pad portion 2 and above the groove portion 6b.
- the 2nd convex part 5a is formed so that it may protrude toward the lower side.
- a third convex portion 5b is formed on the lower surface of the second convex portion 5a so as to protrude further downward.
- the contact electrode portion 4 and the bonding pad portion 2 are not electrically connected, and an insulating layer 7 is provided between the first convex portion 2 c and the contact electrode portion 4.
- the bonding pad portion 2 and the contact electrode portion 4 are electrically connected to each other at the location where the connection portion 5 is formed in the bonding pad portion 2, and an insulating layer is provided between the connection portion 5 and the contact electrode portion 4. Does not have 7.
- FIG. 6 is a view for explaining a conventional method for manufacturing a semiconductor device, and is a cross-sectional view taken along line AA in FIG.
- the bonding pad portion 2 when the elongated bonding pad portion 2 is used, it is preferable to dispose the bonding pad portion 2 as follows in order to collect current from the contact electrode portion 4 efficiently with a small number of metal wires.
- Current collection from the contact electrode portion 4 is performed by the bonding pad portion 2 for wire bonding the aluminum wire 3.
- the bonding pad portion includes a large number of groove portions 6b (second concave portions 2b) formed in the contact electrode portion 4 and is orthogonal to the groove portions 6a (first concave portions 2a). 2 is arranged in the GaN-based power device 1.
- ultrasonic bonding is used for bonding the aluminum wire 3.
- a substrate on which a bonding pad portion 2 is faced up and a GaN-based power device 1 is die-bonded is placed on a fixed base of an ultrasonic bonding apparatus, and a substrate on which the GaN-based power device 1 is die-bonded is usually mounted.
- the direction in which the wire is stretched matches the direction of ultrasonic vibration.
- the bonding wire (aluminum wire 3) supplied from the ultrasonic bonding apparatus to the bonding pad portion 2 is pressed by the wedge tool of the ultrasonic bonding apparatus, and a bonding load (wedge pressure) is applied while applying ultrasonic vibration.
- the connecting portion of the aluminum wire 3 is usually parallel to the longitudinal direction of the bonding pad portion 2 in order to match the direction of stretching the wire and the direction of ultrasonic vibration during ultrasonic bonding (see FIG. 2). (See (a)).
- the ultrasonic wave application direction 21 and the longitudinal direction of the contact electrode portion 4 are perpendicular as shown in FIG.
- the ultrasonic wave application direction 21 indicates the direction of ultrasonic vibration applied during ultrasonic bonding
- the longitudinal direction of the contact electrode portion 4 indicates the Y direction in FIG.
- FIG. 4 is a perspective view of the contact electrode portion 4 of the semiconductor device 50 according to the first embodiment of the present invention.
- the corner 4 c of the contact electrode of the contact electrode unit 4 indicates the inner side of the upper surface of the second electrode of the contact electrode unit 4.
- the ultrasonic wave application direction 21 is substantially the same as the contact electrode portion line direction 20.
- the aluminum wire 3 is ultrasonically bonded to the bonding pad portion 2 so as to be parallel.
- 5A is a plan view of the contact electrode portion 4 of the semiconductor device 50 according to the present embodiment
- FIG. 5B is a view formed by the contact electrode portion line direction 20 and the ultrasonic wave application direction 21. It is a figure explaining angle (theta).
- the substantially parallel mentioned above means that the contact electrode portion line direction 20 and the ultrasonic wave application direction 21 are parallel, or when the ultrasonic wave application direction 21 is used as a reference, the contact electrode portion line direction 20 and the ultrasonic wave application direction 21 are the same.
- the angle ⁇ formed is ⁇ 45 ° ⁇ ⁇ ⁇ 45 °.
- either the contact electrode portion line direction 20 or the ultrasonic wave application direction 21 may be a reference, that is, substantially parallel.
- the angle ⁇ formed by the contact electrode portion line direction 20 and the ultrasonic wave application direction 21 (the size of the angle ⁇ formed by the contact electrode portion line direction 20 and the ultrasonic wave application direction 21) is 0 ° ⁇ ⁇ . ⁇ 45 °.
- the contact electrode portion line direction 20 indicates the longitudinal direction of the contact electrode portion 4.
- FIG. 7 is a plan view of the bonding pad portion 2 of the semiconductor device 50 according to the present embodiment.
- the ultrasonic wave application direction 21 and the contact electrode portion line direction 20 are substantially parallel. For this reason, the stress to the corner
- produce in the insulating layer 7 can be suppressed. As a result, a short circuit due to the interlayer crack 10 can be suppressed. Further, in the method for manufacturing the semiconductor device 50 according to the present embodiment, only a simple change for changing the vibration direction of the wedge tool is required, and it is not necessary to procure the manufacturing apparatus and a new member, and the cost is higher and the reliability is higher. There is an effect that a product can be manufactured.
- the manufacturing method of the semiconductor device 50 according to the present embodiment includes the contact electrode portion 4 formed on the electronic functional element 8 and the GaN power device 1 by ultrasonic bonding.
- the ultrasonic wave application direction 21 and the contact electrode portion line direction 20 are substantially parallel.
- the manufacturing method of the semiconductor device 50 allows the bonding pad portion 2 and the inner lead portion 55 or the MOS-FET 51 to be electrically connected with the aluminum wire 3 exceeding the bonding pad portion 2.
- the ultrasonic wave application direction 21 and the contact electrode portion line direction 20 are substantially parallel to each other.
- FIG. 1 A verification example of the method for manufacturing the semiconductor device 50 according to this embodiment will be described below.
- This verification example shows an example in which the aluminum wire 3 is wire bonded to the bonding pad portion 2 under the following conditions (1) to (3).
- the bonding pad portion 2 formed on the GaN-based power device 1 is about 600 ⁇ m ⁇ 1200 ⁇ m.
- the aluminum wire 3 is ⁇ 300 ⁇ m.
- Wire bonding is performed by ultrasonic bonding with a load of 700 g.
- the load on the GaN-based power device 1 during ultrasonic bonding can be further reduced. Can be further suppressed.
- the corner 4c of the contact electrode is likely to be a starting point, the shape of the contact electrode 4 is tapered from the bottom surface of the groove 6a to the corner 4c of the contact electrode instead of a square, so that the ultrasonic bonding can be performed.
- the load on the corner 4c of the contact electrode can be reduced. Therefore, generation
- the material and shape of the GaN-based power device 1 itself are not limited.
- the target to be connected to the GaN-based power device 1 by wire bonding is not limited to the inner lead portion 55 and the MOS-FET 51, but may be the die pad portion 58, other chip terminals, or the like, and the connection destination is not limited.
- the number of GaN-based power devices 1 mounted on the semiconductor device 50 is not limited as long as it is at least one.
- about the wire to be used, material, wire diameter, etc. are not limited, such as gold
- the outer lead portion 54 and the inner lead portion 55 can generally be made of solid copper or Ag-plated product, but the material is not limited.
- the direction in which the contact electrode portion 4 is extended is the longitudinal direction of the GaN-based power device 1, but is not limited thereto.
- the contact electrode part line direction 20 and the ultrasonic wave application direction 21 at the time of ultrasonic bonding should just be substantially parallel.
- the ultrasonic wave application direction 21 and the contact electrode portion line direction 20 are substantially parallel. Therefore, during ultrasonic bonding, the load of stress applied to the groove 6a of the contact electrode portion 4 and the first convex portion 2c of the bonding pad portion 2 is reduced, and the generation of the interlayer crack 10 can be suppressed. This will be explained in detail below.
- the groove part 6a is a hollow part formed when the contact electrode part 4 is produced. After the formation of the contact electrode portion 4, the groove portion 6a is filled with the insulating layer 7, and the bonding pad portion 2 is formed thereon. In that case, the 1st convex part 2c which has a convex shape toward the groove part 6a is formed in the bonding pad part 2 in the position facing the groove part 6a. In the manufacturing process of the conventional semiconductor device, the presence of the groove 6a and the first convex portion 2c formed in the contact electrode portion 4 tends to easily cause the interlayer crack 10 during ultrasonic bonding.
- ultrasonic vibration is applied so that the longitudinal direction of the groove 6a and the ultrasonic wave application direction 21 are substantially parallel during ultrasonic bonding.
- the stress load applied to the groove 6a and the first convex portion 2c is reduced, and the generation of the interlayer crack 10 can be suppressed.
- FIG. 8 is a plan view of the bonding pad portion 2 of the semiconductor device 50 according to the present embodiment.
- the bonding pad portion 2 of the semiconductor device 50 according to the first embodiment is rectangular as shown in FIG.
- the shape of the bonding pad portion 2 of the semiconductor device 50 has a wide portion (wide region) and a narrow portion (narrow width) in the contact electrode portion line direction 20 and the ultrasonic wave application direction 21. Region).
- the narrow area of one bonding pad part 2 and the wide area of the other bonding pad part 2 face each other in the direction along the longitudinal direction of the lower layer metal (second electrode 42).
- the narrow region of the other bonding pad portion 2 and the wide region of the one bonding pad portion 2 face each other in the direction along the longitudinal direction of the lower layer metal.
- the aluminum wire 3 is wire-bonded to the wide portion so as to be substantially parallel to the longitudinal direction of the bonding pad portion 2.
- the semiconductor device 50 has two bonding pad portions 2.
- the GaN-based power device 1 has a plurality of contact electrode portions 4 that are parallel to each other.
- Each of the two bonding pad portions 2 is an electrical connection region arranged so as to cross all of the plurality of contact electrode portions 4 along an ultrasonic orthogonal direction that is a direction perpendicular to the application direction of ultrasonic vibration. 11 (electrical connection).
- Each of the two bonding pad portions 2 has a bonding region 12 (bonding portion) whose length in the orthogonal direction of ultrasonic waves is smaller than the electrical connection region 11 and larger than the diameter of the aluminum wire 3. Further, the bonding region 12 of one bonding pad portion 2 and the bonding region 12 of the other bonding pad portion 2 are arranged side by side in the ultrasonic orthogonal direction.
- the direction in which the aluminum wire 3 is wire bonded to the bonding pad portion 2 (hereinafter referred to as the bonding direction of the aluminum wire 3) and the contact electrode portion line direction 20 can be made substantially parallel. Therefore, at the time of ultrasonic bonding, ultrasonic vibration can be applied without difficulty and substantially parallel to the contact electrode portion line direction 20. As a result, the risk that the wedge tool is bent can be avoided. Moreover, since the aluminum wire 3 is crushed in the length direction by the above configuration, it is possible to avoid a risk of protruding from the bonding pad portion 2. This will be explained in detail below. Details will be described below.
- the bonding direction of the aluminum wire 3 and the ultrasonic wave application direction 21 are substantially perpendicular to each other.
- the force from the wedge tool is likely to be applied in a direction along the length direction of the aluminum wire 3. Therefore, in the manufacturing method according to the first embodiment in which ultrasonic vibration applied from the wedge tool to the aluminum wire 3 is applied perpendicularly to the length direction of the aluminum wire 3, an excessive stress is applied between the aluminum wire 3 and the wedge tool. .
- the flap of the wedge tool becomes large, and the wedge tool may be bent.
- the aluminum wire 3 is crushed in the ultrasonic wave application direction 21. Therefore, when ultrasonic vibration is applied to the aluminum wire 3 in the first embodiment, the aluminum wire 3 is crushed in the diameter direction of the aluminum wire 3. For this reason, the aluminum wire 3 crushed in the diametrical direction may protrude from the bonding pad portion 2. Therefore, in the method for manufacturing the semiconductor device 50 according to the first embodiment, measures are required to prevent the aluminum wire 3 from protruding from the bonding pad portion 2, such as increasing the bonding pad portion 2.
- the bonding direction of the aluminum wire 3 and the contact electrode portion line direction 20 are substantially parallel, so that the bonding direction of the aluminum wire 3 and the ultrasonic wave application direction 21 are substantially parallel. According to the above configuration, ultrasonic vibration can be applied to the aluminum wire 3 without applying excessive stress from the wedge tool to the aluminum wire 3. As a result, it is possible to avoid the risk of bending of the wedge tool.
- the aluminum wire 3 is crushed in the length direction during ultrasonic bonding, so that the danger of the aluminum wire 3 protruding from the bonding pad portion 2 can be avoided.
- the bonding pad portion 2 that collects the current from the contact electrode portion 4 traverses all of the plurality of contact electrode portions 4 and has a large area. The current from the contact electrode unit 4 can be collected.
- FIGS. 9A to 9F are plan views of the bonding pad portion 2 of the semiconductor device 50 according to the present embodiment.
- the bonding pad portion 2 of the semiconductor device 50 according to the first embodiment is rectangular as shown in FIG.
- the bonding pad portion 2 has a connection portion 5 that is electrically connected to any one of the contact electrode portions 4.
- the width of the electrical connection region 11 and the bonding region 12 in the direction increases as the total number of the connection portions 5 arranged in the direction orthogonal to the ultrasonic wave increases.
- the current density collected from the contact electrode portion 4 can be smoothed, so that an electrical loss can be reduced and electricity can be efficiently extracted. Details will be described below.
- the bonding pad portion 2 shown in FIG. 9A is one of the bonding pad portions 2 installed in the GaN-based power device 1.
- the bonding pad portion 2 shown in FIG. 9A is paired with the bonding pad portion 2 having a shape rotated by 180 ° about the midpoint of the oblique side of the bonding pad portion 2 shown in FIG.
- the GaN-based power device 1 is disposed.
- the two bonding pad portions 2 are rectangular as a whole when the two pairs are combined.
- the aluminum wire 3 is ultrasonically bonded so that the bonding direction of the aluminum wire 3 and the contact electrode portion line direction 20 are substantially parallel to each other.
- the pair of bonding pad portions 2 are formed in a shape that does not interfere with the aluminum wires 3 of each other.
- connection portion 5 increases as the number of locations (connection portions 5) electrically connected to the bonding pad portion 2 increases. Therefore, even if the number of electrically connected locations (connection portion 5) increases, the current density increases if the area of the bonding pad portion 2 is constant. Therefore, the bonding pad portion 2 according to the present embodiment increases the width of the bonding pad portion 2 of the connection portion 5 in the direction perpendicular to the contact electrode portion line direction 20 as the total number increases.
- the current from the contact electrode portion 4 is collected from the right side of the drawing to the left side of the drawing.
- the total number of connection portions 5 of the bonding pad portion 2 increases from the right side of the drawing to the left side of the drawing.
- the width of the bonding pad portion 2 in the direction perpendicular to the contact electrode portion line direction 20 also increases from the right side to the left side of the drawing.
- FIG. 9B is an example of the shape of the bonding pad portion 2 of the semiconductor device 50 of the present embodiment shown in FIG. 9B, and the shape of the bonding pad portion 2 is an arc shape, a slide shape, or a staircase shape. Or a case where each part has irregularities.
- the shape of the bonding pad portion 2 only needs to be larger toward the endmost line of each contact electrode portion line when viewed macroscopically, and the pad shape is not limited.
- a vacant area 13 may be formed between the two bonding pad parts 2 and a new bonding pad part may be arranged in this vacant area.
- the upper layer metal (bonding pad portion 2) formed on the semiconductor element (GaN-based power device 1) is applied while applying ultrasonic vibration to the wire.
- a method of manufacturing a semiconductor device (50) including an ultrasonic bonding step of bonding the wire (aluminum wire 3), wherein the semiconductor element is formed of a lower layer metal (second electrode 42) formed under the upper layer metal.
- the ultrasonic wave is set so that the angle ⁇ formed by the direction in which ultrasonic vibration is applied to the wire and the longitudinal direction of the lower layer metal satisfies 0 ° ⁇ ⁇ ⁇ 45 °. Apply vibration.
- the ultrasonic vibration is substantially parallel to the longitudinal direction of the lower layer metal (the angle ⁇ between the direction in which the ultrasonic vibration is applied to the wire and the longitudinal direction of the lower layer metal is 0 ° ⁇ ⁇ ⁇ 45 °. ) Is applied.
- angular part of a contact electrode is relieve
- the method of manufacturing a semiconductor device (50) according to aspect 2 of the present invention is the method of manufacturing the semiconductor device (50) according to aspect 1, wherein the semiconductor element (GaN-based power device 1) is a GaN-based semiconductor element and the wire (aluminum wire 3) is an aluminum wire. It may be.
- a GaN-based semiconductor element is used as the semiconductor element. For this reason, a power semiconductor device can be manufactured. Moreover, the aluminum wire is used for the wire. For this reason, it can respond to a large current.
- the lower metal (second electrode 42) has a recess, and the upper metal (bonding pad part 2)
- a convex portion (first convex portion 2c) protruding toward the concave portion may be provided at a position facing the concave portion.
- the concave shape is formed in the lower layer metal, and the convex shape is formed toward the lower layer metal at a position facing the concave shape of the lower layer metal of the upper layer metal.
- stress applied to the convex shape of the upper layer metal and the concave shape of the lower layer metal during ultrasonic bonding is reduced, and generation of interlayer cracks can be suppressed.
- a semiconductor device (50) according to Aspect 4 of the present invention is a semiconductor device manufactured by the method for manufacturing a semiconductor device according to any one of Aspects 1 to 3, wherein the semiconductor device (50) A semiconductor element (GaN-based power device 1) and two upper metal layers (bonding pad portion 2), and the semiconductor element includes a plurality of lower metal layers (second electrodes 42) and two upper metal layers.
- Each of the metals has an electrical connection portion (electrical connection region) arranged so as to traverse all of the plurality of lower-layer metals along an orthogonal direction of ultrasonic waves, which is a direction perpendicular to the application direction of the ultrasonic vibration.
- bonding region 12 whose length in the orthogonal direction of ultrasonic waves is smaller than that of the electrical connection portion and larger than the diameter of the wire (aluminum wire 3).
- bonding portion of one of the upper metallization, and the above bonding portion of the other of the upper-layer metal may be arranged in the ultrasonic orthogonal direction.
- the bonding direction of the wire in the upper layer metal and the longitudinal direction of the lower layer metal can be made substantially parallel. Therefore, ultrasonic vibration can be applied substantially in parallel with the longitudinal direction of the lower layer metal without applying excessive stress during ultrasonic bonding. Thereby, the danger that a wedge tool will bend can be avoided. Moreover, according to the said structure, since a wire is crushed in the length direction, the danger of protruding from an upper metal can be avoided.
- each upper layer metal (bonding pad portion 2) is electrically connected to any one of the lower layer metal (second electrode 42). (5), and the length of the electrical connection portion (electrical connection region 11) and the bonding portion (bonding region 12) in the ultrasonic orthogonal direction of each upper layer metal is in the ultrasonic orthogonal direction. The larger the total number of the connection parts arranged in the line, the larger it may be.
- the present invention can be used as a method for manufacturing a semiconductor device, and in particular, can be used for a method for manufacturing a semiconductor device using ultrasonic bonding for wire bonding.
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Abstract
Description
本発明の実施形態1に係る半導体装置50の製造方法および半導体装置50を、図1~図7に基づき説明する。
まず、本実施形態に係る半導体装置50の構造について、図2の(a)および図2の(b)に基づき説明する。図2の(a)は、本発明の実施形態1に係る半導体装置50の構成を示す平面図である。図2の(b)は、図2の(a)の側面図である。
半導体装置50の配線構造について、図1~図7に基づき説明する。
本実施形態に係る半導体装置50の製造方法の検証例について以下に述べる。本検証例では、下記(1)~(3)の条件により、アルミワイヤ3をボンディングパッド部2にワイヤボンディングする場合について実施した例を示す。(1)GaN系パワーデバイス1上に形成されるボンディングパッド部2を約600μm×1200μmとする。(2)アルミワイヤ3をφ300μmとする。(3)ワイヤボンディングを、荷重700gとする超音波ボンディングにより実施する。
本発明の他の実施形態について、図7および図8に基づいて説明すれば、以下のとおりである。図8は、本実施形態に係る半導体装置50のボンディングパッド部2の平面図である。
本発明の実施形態3について、図9の(a)~図9の(f)に基づいて説明すれば、以下のとおりである。図9の(a)~図9の(f)は、本実施形態に係る半導体装置50のボンディングパッド部2の平面図である。
本発明の態様1に係る半導体装置(50)の製造方法は、超音波振動をワイヤに印加させながら、半導体素子(GaN系パワーデバイス1)上に形成された上層メタル(ボンディングパッド部2)に該ワイヤ(アルミワイヤ3)をボンディングする超音波ボンディング工程を含む半導体装置(50)の製造方法であって、上記半導体素子は、上記上層メタルの下に形成されている下層メタル(第2電極42)を有し、上記超音波ボンディング工程にて、超音波振動を上記ワイヤに印加する方向と上記下層メタルの長手方向との成す角θが、0°≦θ≦45°となるように超音波振動を印加する。
2 ボンディングパッド部(上層メタル)
2a 第1凹部
2b 第2凹部
2c 第1凸部(凸部)
3 アルミワイヤ
4 接触電極部
4c 接触電極の角部
5 接続部
5a 第2凸部
5b 第3凸部
6a、6b 溝部
7 絶縁層
8 電子機能素子
10 層間クラック
11 電気的接続領域(電気的接続部)
12 ボンディング領域(ボンディング部)
13 空き領域
20 接触電極部ライン方向
21 超音波印加方向
41 第1電極
41a つば部
42 第2電極(下層メタル)
42a つば部
50 半導体装置
51 MOS-FET
52 フィン部
53 金線
54 アウターリード部
55 インナーリード部
56 半田
57 銀ペースト
58 ダイパッド部
Claims (5)
- 超音波振動をワイヤに印加させながら、半導体素子上に形成された上層メタルに該ワイヤをボンディングする超音波ボンディング工程を含む半導体装置の製造方法であって、
上記半導体素子は、上記上層メタルの下に形成されている下層メタルを有し、
上記超音波ボンディング工程にて、超音波振動を上記ワイヤに印加する方向と上記下層メタルの長手方向との成す角θが、0°≦θ≦45°となるように超音波振動を印加することを特徴とする半導体装置の製造方法。 - 上記半導体素子はGaN系半導体素子であり、上記ワイヤはアルミニウムワイヤ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。
- 上記下層メタルは、凹部を有し、
上記上層メタルは、上記凹部に対向する位置に該凹部に向かって突出した凸部を有することを特徴とする請求項1または2に記載の半導体装置の製造方法。 - 請求項1から3のいずれか1項に記載の半導体装置の製造方法により製造された半導体装置であって、
上記半導体装置は、上記半導体素子と2つの上記上層メタルとを有し、
上記半導体素子は、複数の上記下層メタルを有し、
2つの上記上層メタルの各々は、
上記超音波振動の印加方向に垂直な方向である超音波直交方向に沿って、複数の上記下層メタルの全てを横断するように配置された電気的接続部と、
上記超音波直交方向の長さが、上記電気的接続部より小さく、かつ、上記ワイヤの直径より大きいボンディング部とを有しており、
一方の上記上層メタルの上記ボンディング部と、他方の上記上層メタルの上記ボンディング部とが、上記超音波直交方向に並んで配置されていることを特徴とする半導体装置。 - 各上記上層メタルは、上記下層メタルのいずれかと電気的に接続する接続部を有し、
各上記上層メタルの、上記超音波直交方向における上記電気的接続部および上記ボンディング部の長さは、当該超音波直交方向に並んだ上記接続部の総数が多いほど大きくなることを特徴とする請求項4に記載の半導体装置。
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JP2016505127A JP6250788B2 (ja) | 2014-02-27 | 2015-02-04 | 半導体装置 |
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Citations (3)
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JP2002324798A (ja) * | 2001-04-25 | 2002-11-08 | Nissan Motor Co Ltd | 電極構造 |
JP2004140072A (ja) * | 2002-10-16 | 2004-05-13 | Fuji Electric Device Technology Co Ltd | パワー半導体装置のワイヤボンディング方法 |
JP2005510057A (ja) * | 2001-11-16 | 2005-04-14 | オイペク オイロペーシェ ゲゼルシャフト フューア ライストゥングスハルプライター エムベーハー | 半導体素子および半導体素子の接触方法 |
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JPS60176554U (ja) * | 1984-05-04 | 1985-11-22 | 株式会社日立製作所 | 半導体装置 |
JP2001319945A (ja) * | 2000-03-02 | 2001-11-16 | Ibiden Co Ltd | 電子部品搭載用基板 |
US8193555B2 (en) * | 2009-02-11 | 2012-06-05 | Megica Corporation | Image and light sensor chip packages |
JP2012015263A (ja) * | 2010-06-30 | 2012-01-19 | Shindengen Electric Mfg Co Ltd | ワイヤボンディング装置 |
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JP2002324798A (ja) * | 2001-04-25 | 2002-11-08 | Nissan Motor Co Ltd | 電極構造 |
JP2005510057A (ja) * | 2001-11-16 | 2005-04-14 | オイペク オイロペーシェ ゲゼルシャフト フューア ライストゥングスハルプライター エムベーハー | 半導体素子および半導体素子の接触方法 |
JP2004140072A (ja) * | 2002-10-16 | 2004-05-13 | Fuji Electric Device Technology Co Ltd | パワー半導体装置のワイヤボンディング方法 |
Cited By (1)
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WO2021192384A1 (ja) * | 2020-03-25 | 2021-09-30 | ローム株式会社 | 半導体装置および半導体装置の製造方法 |
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