WO2022145266A1 - 半導体装置、および半導体装置の製造方法 - Google Patents
半導体装置、および半導体装置の製造方法 Download PDFInfo
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- WO2022145266A1 WO2022145266A1 PCT/JP2021/046945 JP2021046945W WO2022145266A1 WO 2022145266 A1 WO2022145266 A1 WO 2022145266A1 JP 2021046945 W JP2021046945 W JP 2021046945W WO 2022145266 A1 WO2022145266 A1 WO 2022145266A1
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- semiconductor device
- thickness direction
- support member
- metal layer
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Images
Classifications
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- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/495—Lead-frames or other flat leads
- H01L23/49503—Lead-frames or other flat leads characterised by the die pad
- H01L23/49513—Lead-frames or other flat leads characterised by the die pad having bonding material between chip and die pad
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
- H01L21/4814—Conductive parts
- H01L21/4821—Flat leads, e.g. lead frames with or without insulating supports
- H01L21/4825—Connection or disconnection of other leads to or from flat leads, e.g. wires, bumps, other flat leads
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
- H01L21/4814—Conductive parts
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
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- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
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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
- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/47—Structure, shape, material or disposition of the wire connectors after the connecting process
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Definitions
- the present disclosure relates to a semiconductor device for bonding a support member and a semiconductor element and having a bonding layer containing a metal composition, and a method for manufacturing the semiconductor device.
- Patent Document 1 discloses an example of a semiconductor device in which a MOSFET is mounted as a semiconductor element.
- the semiconductor device is converted by a support member (drain lead) to which a power supply voltage is applied and supports a MOSFET, a gate lead for inputting an electric signal to the MOSFET, and a MOSFET based on the power supply voltage and the electric signal. It is equipped with a source lead through which current flows.
- the MOSFET has a drain electrode conducting to the drain lead, a gate electrode conducting to the gate lead, and a source electrode conducting to the source lead.
- the drain electrode is joined to the support member by a joining layer (solder).
- a metal clip is bonded to the gate electrode and the gate lead and the source electrode and the source lead, respectively. This makes it possible to pass a larger current through the semiconductor device.
- MOSFET semiconductor devices equipped with MOSFETs including compound semiconductor substrates made of silicon carbide (SiC) or the like are becoming widespread.
- the MOSFET has an advantage that the power conversion efficiency is further improved while the size of the element is made smaller as compared with the conventional MOSFET.
- the MOSFET is adopted in the semiconductor device disclosed in Patent Document 1, when the drain electrode is bonded to the support member by using the bonding layer, the position of the MOSFET may shift with respect to the support member. This is due to the fact that the weight of the MOSFET is relatively small and that the bonding layer is wetted and spread with respect to the support member by melting the bonding layer (solder) by reflow. Therefore, in order to suppress the displacement of the MOSFET with respect to the support member, a measure for restricting the wetting and spreading of the joint layer with respect to the support member is desired.
- the semiconductor device provided by the first aspect of the present disclosure comprises a support member having a main surface facing in the thickness direction, a semiconductor element mounted on the main surface, and the main surface and the semiconductor element.
- the support member comprises a bonding layer to be bonded, the support member has a base material, and a metal layer laminated on the base material and including the main surface, and the support member has the bonding layer.
- a first region in contact with the first region and a second region adjacent to the first region when viewed in the thickness direction are included, and the bonding layer contains a metal composition which is a solid phase and is a liquid phase of the metal composition.
- the liquid repellency against the water is higher in the second region than in the first region.
- the method for manufacturing a semiconductor device includes a step of forming a metal layer covering the main surface in a base material having a main surface facing in the thickness direction, and a first method of the metal layer.
- FIG. 3 is a cross-sectional view taken along the line VII-VII of FIG. It is a partially enlarged view of FIG. It is a partially enlarged view of FIG. It is a partially enlarged sectional view of the semiconductor device shown in FIG. It is a partially enlarged view of FIG.
- FIG. It is a top view explaining the manufacturing process of the semiconductor device shown in FIG. It is a top view explaining the manufacturing process of the semiconductor device shown in FIG. It is a top view explaining the manufacturing process of the semiconductor device shown in FIG. It is a top view explaining the manufacturing process of the semiconductor device shown in FIG. It is a partially enlarged sectional view explaining the manufacturing process of the semiconductor device shown in FIG. 1. It is a partially enlarged sectional view explaining the manufacturing process of the semiconductor device shown in FIG. 1. It is a top view explaining the manufacturing process of the semiconductor device shown in FIG. It is a top view explaining the manufacturing process of the semiconductor device shown in FIG. It is a top view explaining the manufacturing process of the semiconductor device shown in FIG. It is a partially enlarged sectional view of the 1st modification of the semiconductor device shown in FIG.
- FIG. 3 is a cross-sectional view taken along the line XXIV-XXIV of FIG. 23. It is a partially enlarged view of FIG. 24.
- the semiconductor device A10 according to the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 11.
- the semiconductor device A10 is used in an electronic device including a power conversion circuit such as a DC-DC converter.
- the semiconductor device A10 includes a support member 10, a plurality of terminals 20, a semiconductor element 30, a first bonding layer 39, a plurality of conductive members 40, and a sealing resin 50.
- FIG. 3 is transparent to the sealing resin 50 for convenience of understanding.
- the transmitted sealing resin 50 is shown by an imaginary line (dashed-dotted line).
- the thickness direction of the support member 10 is referred to as "thickness direction z" for convenience.
- One direction orthogonal to the thickness direction z is called “first direction x”.
- the direction orthogonal to both the thickness direction z and the first direction x is referred to as a "second direction y".
- the first direction x corresponds to the longitudinal direction of the semiconductor device A10 when viewed in the thickness direction z.
- the second direction y corresponds to the lateral direction of the semiconductor device A10.
- the support member 10 is equipped with a semiconductor element 30.
- the support member 10 has conductivity.
- the support member 10 includes a die pad portion 10A and a terminal portion 10B.
- the die pad portion 10A has a main surface 101, a back surface 102, and a through hole 103.
- the main surface 101 faces the thickness direction z.
- the semiconductor element 30 is mounted on the main surface 101.
- the back surface 102 faces the side opposite to the main surface 101 in the thickness direction z.
- the back surface 102 is, for example, tin (Sn) plated.
- the through hole 103 penetrates the die pad portion 10A from the main surface 101 to the back surface 102 in the thickness direction z.
- the through hole 103 has a circular shape when viewed in the thickness direction z.
- the die pad portion 10A has a base material 11 and a metal layer 12.
- the base material 11 is a main element of the die pad portion 10A.
- the base material 11 includes the back surface 102.
- the base material 11 is composed of the same lead frame together with the terminal portion 10B and the plurality of terminals 20.
- the lead frame is copper (Cu) or a copper alloy. Therefore, the composition of the base material 11 contains copper, and the composition of the plurality of terminals 20 is the same as the composition of the base material 11.
- the thickness T of the base material 11 is larger than the maximum thickness t max of each of the plurality of terminals 20.
- the metal layer 12 is laminated on the base material 11.
- the metal layer 12 includes a main surface 101.
- the thickness of the metal layer 12 is smaller than the thickness T of the base material 11.
- the composition of the metal layer 12 contains silver (Ag).
- the composition of the metal layer 12 may include nickel (Ni).
- the metal layer 12 is laminated over the entire base material 11.
- the terminal portion 10B includes a portion extending along the first direction x and is connected to the base material 11 of the die pad portion 10A. Therefore, the die pad portion 10A and the terminal portion 10B are electrically connected to each other. A part of the terminal portion 10B is covered with the sealing resin 50. The portion of the terminal portion 10B covered with the sealing resin 50 is bent when viewed in the second direction y. The surface of the terminal portion 10B exposed from the sealing resin 50 is tin-plated.
- the semiconductor element 30 is mounted on the main surface 101 of the die pad portion 10A.
- the semiconductor element 30 includes the first element 31.
- the first element 31 refers to the semiconductor element 30.
- the first element 31 is an n-channel type MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) having a vertical structure.
- the first element 31 includes a compound semiconductor substrate.
- the main material of the compound semiconductor substrate is silicon carbide (SiC).
- Si silicon
- Si silicon
- the area of the first element 31 is 40% or less of the area of the main surface 101 when viewed in the thickness direction z.
- the first element 31 is not limited to the MOSFET.
- the first element 31 may be another switching element such as an IGBT (Insulated Gate Bipolar Transistor).
- the first element 31 may be an integrated circuit such as an LSI. Therefore, the first element 31 may be of any type as long as it is mounted on the main surface 101 via the first joining layer 39.
- the first element 31 has a first electrode 311 and a second electrode 312 and a third electrode 313.
- the first electrode 311 is provided so as to face the main surface 101 of the die pad portion 10A. A current corresponding to the electric power before being converted by the first element 31 flows through the first electrode 311. That is, the first electrode 311 corresponds to the drain electrode.
- the second electrode 312 is provided on the side opposite to the first electrode 311 in the thickness direction z. A current corresponding to the electric power converted by the first element 31 flows through the second electrode 312. That is, the second electrode 312 corresponds to the source electrode.
- the third electrode 313 is provided on the side opposite to the first electrode 311 in the thickness direction z, and is located away from the second electrode 312.
- a gate voltage for driving the first element 31 is applied to the third electrode 313. That is, the third electrode 313 corresponds to the gate electrode.
- the area of the third electrode 313 is smaller than the area of the second electrode 312 when viewed in the thickness direction z.
- the first bonding layer 39 bonds the main surface 101 of the die pad portion 10A and the first electrode 311 of the first element 31.
- the first bonding layer 39 has conductivity.
- the terminal portion 10B is electrically connected to the first electrode 311. Therefore, the terminal portion 10B corresponds to the drain terminal of the semiconductor device A10.
- the first bonding layer 39 contains a metal composition which is a solid phase.
- the composition of the metal composition comprises tin. In this case, the melting point of the metal composition is about 270 ° C.
- the first bonding layer 39 is, for example, solder.
- the die pad portion 10A includes a first region 13 and a second region 14.
- the first region 13 is in contact with the first joining layer 39 and is covered with the first joining layer 39. Therefore, the first element 31 is mounted on the main surface 101 of the first region 13.
- the second region 14 is adjacent to the first region 13 when viewed in the thickness direction z. In the semiconductor device A10, the second region 14 surrounds the first region 13 when viewed in the thickness direction z. In the second region 14, the liquid repellency of the metal composition contained in the first bonding layer 39 to the liquid phase is higher in the second region 14 than in the first region 13.
- the metal layer 12 has a first part 121 and a second part 122.
- the first part 121 is included in the first region 13.
- the second part 122 is included in the second region 14.
- a plurality of grooves 141 are formed in the second region 14.
- the plurality of second regions 14 extend in a direction intersecting the thickness direction z and are arranged in parallel with each other.
- the plurality of grooves 141 are formed only in the second portion 122. Therefore, in the second region 14, the entire base material 11 is covered by the second portion 122.
- the main surface 101 of the die pad portion 10A included in the first portion 121 is flat in the plurality of grooves 141. Therefore, the surface roughness of the second region 14 is larger than the surface roughness of the first region 13.
- the plurality of terminals 20 are located apart from the support member 10.
- the plurality of terminals 20 are conducting to the first element 31.
- the plurality of terminals 20 include a first terminal 21 and a second terminal 22.
- the first terminal 21 extends along the first direction x and is located next to the terminal portion 10B in the second direction y.
- the first terminal 21 is conductive to the second electrode 312 of the first element 31. Therefore, the first terminal 21 corresponds to the source terminal of the semiconductor device A10.
- the first terminal 21 has a covering portion 211 and an exposed portion 212.
- the covering portion 211 is covered with the sealing resin 50.
- the exposed portion 212 is connected to the covering portion 211 and is exposed from the sealing resin 50.
- the exposed portion 212 extends from the covering portion 211 toward the side away from the die pad portion 10A in the first direction x.
- the surface of the exposed portion 212 is, for example, tin-plated.
- the second terminal 22 extends along the first direction x and is located on the side opposite to the first terminal 21 with respect to the terminal portion 10B in the second direction y.
- the second terminal 22 is conductive to the third electrode 313 of the first element 31. Therefore, the second terminal 22 corresponds to the gate terminal of the semiconductor device A10.
- the second terminal 22 has a covering portion 221 and an exposed portion 222.
- the covering portion 221 is covered with the sealing resin 50.
- the exposed portion 222 is connected to the covering portion 221 and is exposed from the sealing resin 50.
- the exposed portion 222 extends from the covering portion 221 toward the side away from the die pad portion 10A in the first direction x.
- the surface of the exposed portion 222 is, for example, tin-plated.
- the heights of the exposed portion of the terminal portion 10B from the sealing resin 50, the exposed portion 212 of the first terminal 21, and the exposed portion 222 of the second terminal 22 are respectively. h is equal to each other.
- at least a part of the terminal portion 10B overlaps each of the first terminal 21 and the second terminal 22.
- the plurality of conductive members 40 are joined to the first element 31 and the plurality of terminals 20. As a result, mutual conduction between the first element 31 and the plurality of terminals 20 is achieved.
- the plurality of conductive members 40 include the first member 41 and the second member 42.
- the first member 41 is joined to the second electrode 312 of the first element 31 and the covering portion 211 of the first terminal 21.
- the first terminal 21 is conducting to the second electrode 312.
- the composition of the first member 41 includes copper.
- the first member 41 is a standard-sized metal clip.
- the first member 41 is joined to the second electrode 312 and the covering portion 211 via the second joining layer 49.
- the second bonding layer 49 has conductivity.
- the composition of the second bonding layer 49 contains tin.
- the melting point of the second bonding layer 49 is lower than the melting point of the first bonding layer 39.
- the second bonding layer 49 is, for example, solder. As shown in FIG.
- the thickness t2 of the second bonding layer 49 is smaller than the thickness t1 of the first bonding layer 39.
- the first member 41 may be a wire. In this case, since the first member 41 is formed by wire bonding, the second bonding layer 49 becomes unnecessary.
- the second member 42 is joined to the third electrode 313 of the first element 31 and the covering portion 221 of the second terminal 22. As a result, the second terminal 22 is electrically connected to the third electrode 313.
- the composition of the second member 42 includes aluminum (Al).
- the second member 42 is a wire.
- the second member 42 is formed by wire bonding.
- the Young's modulus (elastic modulus) of the second member 42 is smaller than the Young's modulus of the first member 41. This is based on the fact that, as described above, the composition of the first member 41 contains copper and the composition of the second member 42 contains aluminum. Therefore, the coefficient of linear expansion of the second member 42 is larger than the coefficient of linear expansion of the first member 41. At the same time, the thermal conductivity of the second member 42 is smaller than the thermal conductivity of the first member 41. Further, as shown in FIG. 8, the width B of the first member 41 is larger than the width (diameter) D of the second member 42.
- the sealing resin 50 covers the first element 31, the plurality of conductive members 40, and a part of each of the support member 10 and the plurality of terminals 20.
- the sealing resin 50 has electrical insulation.
- the sealing resin 50 is made of a material containing, for example, a black epoxy resin.
- the sealing resin 50 has a top surface 51, a bottom surface 52, a pair of first side surfaces 53, a pair of second side surfaces 54, a pair of openings 55, and a mounting hole 56.
- the top surface 51 faces the same side as the main surface 101 of the die pad portion 10A in the thickness direction z.
- the bottom surface 52 faces the side opposite to the top surface 51 in the thickness direction z.
- the back surface 102 of the die pad portion 10A is exposed from the bottom surface 52.
- the pair of first side surfaces 53 are located apart from each other in the first direction x.
- the pair of first side surfaces 53 are connected to the top surface 51 and the bottom surface 52.
- FIG. 5 from the first side surface 53 of one of the pair of first side surfaces 53, a part of the terminal portion 10B, the exposed portion 212 of the first terminal 21, and the exposed portion 222 of the second terminal 22. Is exposed.
- the pair of second side surfaces 54 are located apart from each other in the second direction y.
- the pair of second side surfaces 54 are connected to the top surface 51 and the bottom surface 52.
- the pair of openings 55 are located apart from each other in the second direction y.
- Each of the pair of openings 55 is recessed inward from the top surface 51 and any of the pair of second side surfaces 54 toward the sealing resin 50.
- the main surface 101 of the die pad portion 10A is exposed from each of the pair of openings 55.
- the mounting hole 56 penetrates the sealing resin 50 from the top surface 51 to the bottom surface 52 in the thickness direction z.
- the mounting hole 56 is included in the through hole 103 of the die pad portion 10A when viewed in the thickness direction z.
- the inner peripheral surface of the die pad portion 10A that defines the through hole 103 is covered with the sealing resin 50.
- the maximum dimension of the mounting hole 56 is smaller than the dimension of the through hole 103 when viewed in the thickness direction z.
- FIGS. 15 and 16 are the same as the cross-sectional positions of FIG.
- a metal layer 12 that covers the surface 111 of the base material 11 of the support member 10 (die pad portion 10A) is formed.
- the support member 10 is connected to the plurality of terminals 20 by a tie bar 80 extending in the second direction y.
- the surface 111 faces the same side as the main surface 101 of the support member 10 in the thickness direction z.
- the metal layer 12 is formed by electrolytic plating using the base material 11 as a conductive path or plating by spraying.
- the joining material 81 containing the metal composition is arranged on the first region 821 of the metal layer 12.
- the composition of the metal composition comprises tin.
- the joining material 81 is cream solder. In this step, cream solder is applied to the first region 821.
- the joining material 81 may be wire solder.
- the second region 822 of the metal layer 12 is irradiated with a laser.
- the second region 822 is adjacent to the first region 821 of the metal layer 12.
- the second region 822 has a frame shape surrounding the first region 821 and the joining material 81 when viewed in the thickness direction z.
- this step may be set between the step of forming the metal layer 12 shown in FIG. 12 and the step of arranging the joining material 81 on the first region 821 shown in FIG. Therefore, this step is set between the step of forming the metal layer 12 shown in FIG. 12 and the step of joining the semiconductor element 30 shown in FIG. 17 to the metal layer 12.
- FIG. 15 and 16 show a partially enlarged cross section of the metal layer 12 after irradiation with a laser.
- a plurality of grooves 822A extending in a direction intersecting the thickness direction z are formed in the second region 822 of the metal layer 12.
- the plurality of grooves 822A are arranged in parallel with each other.
- the metal layer 12 is in the state shown in FIG.
- a plurality of slits 822B extending in a direction intersecting the thickness direction z are formed.
- the base material 11 is exposed from the plurality of slits 822B.
- the semiconductor element 30 is formed into the metal layer 12 by melting and solidifying the bonding material 81 by reflow. Join.
- the joining material 81 becomes the first joining layer 39.
- the first region 821 of the metal layer 12 becomes the first region 13 of the support member 10.
- the second region 822 of the metal layer 12 becomes the second region 14 of the support member 10.
- the first member 41 of the conductive member 40 is joined to the second electrode 312 of the semiconductor element 30 and the covering portion 211 of the first terminal 21.
- the first member 41 is joined by clip bonding.
- the second member 42 of the conductive member 40 is joined to the third electrode 313 of the terminal 20 and the covering portion 221 of the second terminal 22.
- the second member 42 is joined by wire bonding.
- the sealing resin 83 that covers the semiconductor element 30, the first member 41 and the second member 42 of the conductive member 40, the support member 10, and a part of each of the plurality of terminals 20.
- the sealing resin 83 is formed by transfer molding.
- the resin burr 831 is formed.
- the resin burr 831 is dammed by the exposed portion 212 of the first terminal 21, the exposed portion 222 of the second terminal 22, the terminal portion 10B of the support member 10, and the tie bar 80. After that, the resin burr 831 is removed with high-pressure water or the like.
- the front surfaces of the exposed portion 212 of the first terminal 21, the exposed portion 222 of the second terminal 22, and the terminal portion 10B, and the back surface 102 of the die pad portion 10A are formed. Apply tin plating to cover. Finally, by cutting the tie bar 80, the semiconductor device A10 is obtained.
- the semiconductor device A11 which is a first modification of the semiconductor device A10, will be described with reference to FIG. 20.
- the cross-sectional position of FIG. 20 is the same as the cross-sectional position of FIG.
- the configuration of the second region 14 of the die pad portion 10A is different from the configuration of the semiconductor device A10.
- the plurality of grooves 141 of the second region 14 are formed in the base material 11.
- a plurality of slits penetrating in the thickness direction z and connecting to the plurality of grooves 141 are formed in the second portion 122 of the metal layer 12.
- the base material 11 is exposed from a plurality of slits formed in the second portion 122.
- the semiconductor device A12 which is a second modification of the semiconductor device A10, will be described with reference to FIG.
- the cross-sectional position of FIG. 21 is the same as the cross-sectional position of FIG.
- the configuration of the second region 14 of the die pad portion 10A is different from the configuration of the semiconductor device A10.
- the plurality of grooves 141 of the second region 14 are formed in the base material 11.
- the second portion 122 of the metal layer 12 does not exist in the second region 14.
- the semiconductor device A13 which is a third modification of the semiconductor device A10, will be described with reference to FIG. 22.
- the cross-sectional position of FIG. 22 is the same as the cross-sectional position of FIG.
- the configuration of the second region 14 of the die pad portion 10A is different from the configuration of the semiconductor device A10.
- the second region 14 has irregularities formed on the main surface 101 of the second portion 122 of the metal layer 12, but a plurality of clear second regions 14 are formed on the second portion 122. do not have.
- the surface roughness of the second region 14 is larger than the surface roughness of the first region 13.
- the output of the laser is output in the step of irradiating the second region 822 of the metal layer 12 shown in FIG. 14 in the manufacturing process of the semiconductor device A10. Obtained by changing.
- the configuration shown in the semiconductor device A12 can be obtained by setting the output of the laser to be relatively high.
- the configuration shown in the semiconductor device A13 is obtained by setting the output of the laser to be relatively low.
- the semiconductor device A10 includes a support member 10 (die pad portion 10A) having a base material 11 and a metal layer 12 laminated on the base material 11.
- the support member 10 includes a first region 13 in contact with the joint layer (first joint layer 39) and a second region 14 adjacent to the first region 13 in the thickness direction z.
- the first bonding layer 39 contains a metal composition which is a solid phase.
- the liquid repellency of the metal composition with respect to the liquid phase is higher in the second region 14 than in the first region 13. That is, the second region 14 has a property of being less likely to get wet with the liquid phase of the metal composition than the first region 13.
- the wet spread of the bonding material 81 which has become a liquid phase is regulated by the second region 14. Therefore, according to the semiconductor device A10, it is possible to regulate the wetting and spreading of the first joining layer 39 with respect to the support member 10.
- the wet spread of the first bonding layer 39 is controlled, the displacement of the semiconductor element 30 arranged on the bonding material 81 which has become a liquid phase is suppressed in the manufacturing process of the semiconductor device A10 shown in FIG. Can be done.
- a plurality of grooves 141 extending in a direction intersecting the thickness direction z and arranged in parallel with each other are formed in the second region 14.
- the plurality of grooves 141 are formed in the second portion 122 of the metal layer 12 of the support member 10.
- the second region 14 has a configuration in which a plurality of grooves 141 are formed on the base material 11 of the support member 10 like the semiconductor device A11 described above, and the support member 10 is exposed from the second portion 122, or the semiconductor device A12 described above.
- a plurality of grooves 141 may be formed in the base material 11 and the second portion 122 may not be present.
- the second region 14 may have a configuration in which a plurality of clear second regions 14 are not formed on the metal layer 12 as in the semiconductor device A13 described above. These configurations of the second region 14 are obtained by irradiating the second region 822 of the metal layer 12 with a laser in the step shown in FIG. 14 in the manufacturing process of the semiconductor device A10. As a result, the surface roughness of the second region 14 is larger than the surface roughness of the first region 13. Such a difference in surface roughness can be one of the factors of the difference in the liquid repellency of the metal composition contained in the first bonding layer 39 with respect to the liquid phase.
- the semiconductor device A10 in order to prevent the first bonding layer 39 from spreading and getting wet with respect to the support member 10, it is not necessary to accurately form the metal layer 12 only in the range of the first region 13 using a mask. .. Therefore, it is possible to improve the manufacturing efficiency of the semiconductor device A10 while controlling the wetting and spreading of the first joining layer 39 with respect to the support member 10.
- the second region 14 surrounds the first region 13 when viewed in the thickness direction z. This makes it possible to more reliably regulate the wet spread of the first joint layer 39 with respect to the support member 10.
- the semiconductor device A10 further includes a terminal 20 that is located away from the support member 10 and is conductive to the semiconductor element 30. When viewed in the thickness direction z, at least a part of the second region 14 is located between the semiconductor element 30 and the terminal 20. This makes it possible to prevent the phenomenon that the first joining layer 39 bridges the support member 10 and the terminal 20. Therefore, a short circuit between the support member 10 and the terminal 20 is prevented.
- the semiconductor device A10 further includes a sealing resin 50 that covers the semiconductor element 30, and a part of each of the support member 10 and the terminal 20.
- the sealing resin 50 is in contact with the second region 14. This makes it possible to increase the adhesive strength of the sealing resin 50 to the support member 10.
- the thickness t1 of the first joining layer 39 is larger than the thickness t2 of the second joining layer 49.
- the heat generated from the semiconductor element 30 is more likely to be conducted to the die pad portion 10A, which is a relatively large-scale member, than to the plurality of conductive members 40, which are relatively small-scale members. .. This makes it possible to improve the heat dissipation of the semiconductor device A10.
- the composition of the base material 11 of the support member 10 includes copper. Further, the thickness T of the base material 11 of the die pad portion 10A is larger than the maximum thickness t max of the terminal 20. As a result, it is possible to improve the efficiency of heat conduction in the direction orthogonal to the thickness direction z while improving the heat conductivity of the die pad portion 10A. This contributes to the improvement of the heat dissipation of the die pad portion 10A.
- the die pad portion 10A has a back surface 102 facing opposite to the main surface 101 in the thickness direction z.
- the back surface 102 is exposed from the sealing resin 50.
- FIG. 23 is transparent to the sealing resin 50 for convenience of understanding.
- the permeated sealing resin 50 is shown by an imaginary line.
- the semiconductor device A20 has a different configuration from the semiconductor device A10 described above in that the semiconductor element 30 and the plurality of conductive members 40 are configured.
- the plurality of conductive members 40 further include a third member 43 in addition to the first member 41 and the second member 42.
- the semiconductor element 30 includes a second element 32 in addition to the first element 31.
- the first element 31 is an IGBT.
- the first element 31 has a first electrode 311 and a second electrode 312 and a third electrode 313 shown in FIGS. 9 and 10.
- the first electrode 311 corresponds to a collector electrode.
- the second electrode 312 corresponds to an emitter electrode.
- the third electrode 313 corresponds to a gate electrode.
- the second element 32 is located away from the first element 31.
- the second element 32 is, for example, a Schottky barrier diode.
- the second element 32 is connected in parallel to the first element 31.
- the second element 32 is a so-called freewheeling diode for passing a current through the second element 32 instead of the first element 31 when a reverse bias is applied to the first element 31. Thereby, the first element 31 can be protected from the reverse bias.
- the type of the second element 32 is not limited to the diode.
- the second element 32 may be of any type as long as it is mounted on the main surface 101 of the die pad portion 10A via the first bonding layer 39 as in the first element 31.
- the second element 32 has a first electrode 321 and a second electrode 322.
- the first electrode 321 is provided so as to face the main surface 101 of the die pad portion 10A.
- the first electrode 321 corresponds to the cathode electrode of the second element 32.
- the first electrode 321 is bonded to the main surface 101 via the first bonding layer 39. Therefore, the portion of the die pad portion 10A in which the first joining layer 39 that joins the main surface 101 and the first electrode 321 is in contact also corresponds to the first region 13 of the support member 10.
- the first electrode 321 is conductive to the first electrode 311 of the first element 31 via the first joining layer 39 and the support member 10.
- the second electrode 322 is provided on the side opposite to the first electrode 321 in the thickness direction z.
- the second electrode 322 corresponds to the anode electrode of the second element 32.
- the third member 43 of the conductive member 40 is connected to the second electrode 312 of the first element 31 and the second electrode 322 of the second element 32 via the second bonding layer 49. It is joined.
- the composition of the third member 43 includes copper.
- the third member 43 is a metal clip having the same standard length as the first member 41. As a result, the second electrode 322 of the second element 32 and the second electrode 312 of the first element 31 are electrically connected to each other.
- the second region 14 of the support member 10 is located between the first element 31 and the second element 32.
- the second region 14 is a second region 13 of the support member 10 in which the first element 31 is arranged via the first joint layer 39, and a second region 13 via the first joint layer 39. It surrounds each of the first region 13 in which the element 32 is arranged.
- the semiconductor device A20 includes a support member 10 (die pad portion 10A) having a base material 11 and a metal layer 12 laminated on the base material 11.
- the support member 10 includes a first region 13 in contact with the joint layer (first joint layer 39) and a second region 14 adjacent to the first region 13 in the thickness direction z.
- the first bonding layer 39 contains a metal composition which is a solid phase.
- the liquid repellency of the metal composition with respect to the liquid phase is higher in the second region 14 than in the first region 13. Therefore, the semiconductor device A20 also makes it possible to regulate the wetting and spreading of the first joining layer 39 with respect to the support member 10.
- the semiconductor element 30 includes a first element 31 and a second element 32 located apart from each other.
- the first element 31 and the second element 32 located apart from each other.
- Wet spread can be regulated.
- the semiconductor element 30 according to the above-described embodiment is mainly intended for those used for power conversion.
- the present disclosure is not limited to the semiconductor device 30 for such applications, and can be applied to semiconductor devices 30 for various purposes as long as the semiconductor element 30 is bonded to the support member 10 via the first bonding layer 39. Can be done.
- the present disclosure is not limited to the above-described embodiment.
- the specific configuration of each part of the present disclosure can be freely redesigned.
- Appendix 1 A support member with a main surface facing in the thickness direction, The semiconductor element mounted on the main surface and A bonding layer for bonding the main surface and the semiconductor element is provided.
- the support member has a base material and a metal layer laminated on the base material and including the main surface.
- the support member includes a first region in contact with the joint layer and a second region adjacent to the first region in the thickness direction.
- the bonding layer contains a metal composition which is a solid phase, and the bonding layer contains a metal composition.
- a semiconductor device in which the liquid repellency of the metal composition with respect to the liquid phase is higher in the second region than in the first region.
- the semiconductor device according to Appendix 1 wherein the surface roughness of the second region is larger than the surface roughness of the first region.
- Appendix 3. The semiconductor device according to Appendix 2, wherein in the second region, a plurality of grooves extending in a direction intersecting with the thickness direction and arranged in parallel with each other are formed.
- Appendix 4. The semiconductor device according to Appendix 3, wherein the metal layer has a first part included in the first region and a second part included in the second region.
- Appendix 5. The semiconductor device according to claim 4, wherein the base material is exposed from the second part.
- Appendix 6. The semiconductor device according to any one of Supplementary note 1 to 5, wherein the second region surrounds the first region when viewed in the thickness direction.
- the semiconductor element includes a first element and a second element located apart from each other.
- Appendix 8. The semiconductor device according to any one of Supplementary note 1 to 7, wherein the composition of the base material contains copper.
- Appendix 9. The semiconductor device according to any one of Supplementary note 1 to 8, wherein the composition of the metal layer contains silver.
- the semiconductor device according to any one of Supplementary note 1 to 10, wherein at least a part of the second region is located between the semiconductor element and the terminal when viewed in the thickness direction.
- Appendix 12. The semiconductor device according to Appendix 11, wherein the terminal composition is the same as that of the base material.
- Appendix 13. Further comprising a sealing resin covering the semiconductor element and each part of the support member and the terminal. The semiconductor device according to Appendix 11 or 12, wherein the sealing resin is in contact with the second region.
- Appendix 14 Further provided with the semiconductor element and the conductive member joined to the terminal, The semiconductor device according to Appendix 13, wherein the conductive member is covered with the sealing resin.
- Appendix 15. The support member has a back surface facing away from the main surface in the thickness direction.
- a plurality of grooves extending in a direction intersecting the thickness direction and arranged in parallel with each other are formed in the second region.
- a plurality of slits extending in a direction intersecting the thickness direction and arranged in parallel with each other are formed in the second region. The method for manufacturing a semiconductor device according to the above.
- A10, A20: Semiconductor device 10 Support member 101: Main surface 102: Back surface 103: Through hole 10A: Die pad part 10B: Terminal part 11: Base material 111: Front surface 12: Metal layer 121: Part 1 122: Part 2 13: First region 14: Second region 141: Groove 20: Terminal 21: First terminal 211: Covered portion 212: Exposed portion 22: Second terminal 221: Covered portion 222: Exposed portion 30: Semiconductor element 31: First Element 311: 1st electrode 312: 2nd electrode 313: 3rd electrode 32: 2nd element 321: 1st electrode 322: 2nd electrode 39: 1st bonding layer 40: Conductive member 41: 1st member 42: 2nd Member 43: Third member 49: Second bonding layer 50: Encapsulating resin 51: Top surface 52: Bottom surface 53: First side surface 54: Second side surface 55: Opening 56: Mounting hole 80: Tie bar 81: Joining material 821 First region 822: Region 822A: Groo
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Abstract
Description
付記1.
厚さ方向を向く主面を有する支持部材と、
前記主面の上に搭載された半導体素子と、
前記主面と前記半導体素子とを接合する接合層と、を備え、
前記支持部材は、基材と、前記基材の上に積層され、かつ前記主面を含む金属層と、を有し、
前記支持部材は、前記接合層が接する第1領域と、前記厚さ方向に視て前記第1領域に隣接する第2領域と、を含み、
前記接合層は、固相である金属組成物を含み、
前記金属組成物の液相に対する撥液性が、前記第1領域よりも前記第2領域の方が高い、半導体装置。
付記2.
前記第2領域の表面粗さは、前記第1領域の表面粗さよりも大である、付記1に記載の半導体装置。
付記3.
前記第2領域には、前記厚さ方向に対して交差する方向に延び、かつ互いに平行に配列された複数の溝が形成されている、付記2に記載の半導体装置。
付記4.
前記金属層は、前記第1領域に含まれる第1部と、前記第2領域に含まれる第2部と、を有する、付記3に記載の半導体装置。
付記5.
前記第2部から前記基材が露出している、請求項4に記載の半導体装置。
付記6.
前記厚さ方向に視て、前記第2領域は、前記第1領域を囲んでいる、付記1ないし5のいずれかに記載の半導体装置。
付記7.
前記半導体素子は、互いに離れて位置する第1素子および第2素子を含み、
前記厚さ方向に視て、前記第2領域の少なくとも一部が前記第1素子と前記第2素子との間に位置する、付記1ないし6のいずれかに記載の半導体装置。
付記8.
前記基材の組成は、銅を含む、付記1ないし7のいずれかに記載の半導体装置。
付記9.
前記金属層の組成は、銀を含む、付記1ないし8のいずれかに記載の半導体装置。
付記10.
前記金属組成物の組成は、錫を含む、付記1ないし9のいずれかに記載の半導体装置。
付記11.
前記支持部材から離れて位置し、かつ前記半導体素子に導通する端子をさらに備え、
前記厚さ方向に視て、前記第2領域の少なくとも一部が前記半導体素子と前記端子との間に位置する、付記1ないし10のいずれかに記載の半導体装置。
付記12.
前記端子の組成は、前記基材の組成と同一である、付記11に記載の半導体装置。
付記13.
前記半導体素子と、前記支持部材および前記端子の各々の一部と、を覆う封止樹脂をさらに備え、
前記封止樹脂は、前記第2領域に接している、付記11または12に記載の半導体装置。
付記14.
前記半導体素子および前記端子に接合された導電部材をさらに備え、
前記導電部材は、前記封止樹脂に覆われている、付記13に記載の半導体装置。
付記15.
前記支持部材は、前記厚さ方向において前記主面とは反対側を向く裏面を有し、
前記裏面は、前記封止樹脂から露出している、付記13または14に記載の半導体装置。
付記16.
厚さ方向を向く主面を有する基材において、前記主面を覆う金属層を形成する工程と、
前記金属層の第1領域の上に金属組成物を含む接合材を配置する工程と、
前記接合材の上に半導体素子を配置する工程と、
前記接合材を溶融および固化させることにより前記半導体素子を前記金属層に接合させる工程と、を備え、
前記金属層を形成する工程と、前記半導体素子を配置する工程と、の間に、前記第1領域に隣接する前記金属層の第2領域にレーザを照射する工程をさらに備える、半導体装置の製造方法。
付記17.
前記第2領域にレーザを照射する工程においては、前記第2領域には、前記厚さ方向に対して交差する方向に延び、かつ互いに平行に配列された複数の溝が形成される、付記16に記載の半導体装置の製造方法。
付記18.
前記第2領域にレーザを照射する工程においては、前記第2領域には、前記厚さ方向に対して交差する方向に延び、かつ互いに平行に配列された複数のスリットが形成される、付記16に記載の半導体装置の製造方法。
101:主面 102:裏面
103:貫通孔 10A:ダイパッド部
10B:端子部 11:基材
111:表面 12:金属層
121:第1部 122:第2部
13:第1領域 14:第2領域
141:溝 20:端子
21:第1端子 211:被覆部
212:露出部 22:第2端子
221:被覆部 222:露出部
30:半導体素子 31:第1素子
311:第1電極 312:第2電極
313:第3電極 32:第2素子
321:第1電極 322:第2電極
39:第1接合層 40:導電部材
41:第1部材 42:第2部材
43:第3部材 49:第2接合層
50:封止樹脂 51:頂面
52:底面 53:第1側面
54:第2側面 55:開口
56:取付け孔 80:タイバー
81:接合材 821:第1領域
822:領域 822A:溝
822B:スリット 83:封止樹脂
831:樹脂バリ z:厚さ方向
x:第1方向 y:第2方向
Claims (18)
- 厚さ方向を向く主面を有する支持部材と、
前記主面の上に搭載された半導体素子と、
前記主面と前記半導体素子とを接合する接合層と、を備え、
前記支持部材は、基材と、前記基材の上に積層され、かつ前記主面を含む金属層と、を有し、
前記支持部材は、前記接合層が接する第1領域と、前記厚さ方向に視て前記第1領域に隣接する第2領域と、を含み、
前記接合層は、固相である金属組成物を含み、
前記金属組成物の液相に対する撥液性が、前記第1領域よりも前記第2領域の方が高い、半導体装置。 - 前記第2領域の表面粗さは、前記第1領域の表面粗さよりも大である、請求項1に記載の半導体装置。
- 前記第2領域には、前記厚さ方向に対して交差する方向に延び、かつ互いに平行に配列された複数の溝が形成されている、請求項2に記載の半導体装置。
- 前記金属層は、前記第1領域に含まれる第1部と、前記第2領域に含まれる第2部と、を有する、請求項3に記載の半導体装置。
- 前記第2部から前記基材が露出している、請求項4に記載の半導体装置。
- 前記厚さ方向に視て、前記第2領域は、前記第1領域を囲んでいる、請求項1ないし5のいずれかに記載の半導体装置。
- 前記半導体素子は、互いに離れて位置する第1素子および第2素子を含み、
前記厚さ方向に視て、前記第2領域の少なくとも一部が前記第1素子と前記第2素子との間に位置する、請求項1ないし6のいずれかに記載の半導体装置。 - 前記基材の組成は、銅を含む、請求項1ないし7のいずれかに記載の半導体装置。
- 前記金属層の組成は、銀を含む、請求項1ないし8のいずれかに記載の半導体装置。
- 前記金属組成物の組成は、錫を含む、請求項1ないし9のいずれかに記載の半導体装置。
- 前記支持部材から離れて位置し、かつ前記半導体素子に導通する端子をさらに備え、
前記厚さ方向に視て、前記第2領域の少なくとも一部が前記半導体素子と前記端子との間に位置する、請求項1ないし10のいずれかに記載の半導体装置。 - 前記端子の組成は、前記基材の組成と同一である、請求項11に記載の半導体装置。
- 前記半導体素子と、前記支持部材および前記端子の各々の一部と、を覆う封止樹脂をさらに備え、
前記封止樹脂は、前記第2領域に接している、請求項11または12に記載の半導体装置。 - 前記半導体素子および前記端子に接合された導電部材をさらに備え、
前記導電部材は、前記封止樹脂に覆われている、請求項13に記載の半導体装置。 - 前記支持部材は、前記厚さ方向において前記主面とは反対側を向く裏面を有し、
前記裏面は、前記封止樹脂から露出している、請求項13または14に記載の半導体装置。 - 厚さ方向を向く主面を有する基材において、前記主面を覆う金属層を形成する工程と、
前記金属層の第1領域の上に金属組成物を含む接合材を配置する工程と、
前記接合材の上に半導体素子を配置する工程と、
前記接合材を溶融および固化させることにより前記半導体素子を前記金属層に接合させる工程と、を備え、
前記金属層を形成する工程と、前記半導体素子を配置する工程と、の間に、前記第1領域に隣接する前記金属層の第2領域にレーザを照射する工程をさらに備える、半導体装置の製造方法。 - 前記第2領域にレーザを照射する工程においては、前記第2領域には、前記厚さ方向に対して交差する方向に延び、かつ互いに平行に配列された複数の溝が形成される、請求項16に記載の半導体装置の製造方法。
- 前記第2領域にレーザを照射する工程においては、前記第2領域には、前記厚さ方向に対して交差する方向に延び、かつ互いに平行に配列された複数のスリットが形成される、請求項16に記載の半導体装置の製造方法。
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