Patent ID: 12261138

MODE FOR CARRYING OUT THE INVENTION

Next, modes for carrying out the present disclosure (hereinafter, referred to as an embodiment) will be described with reference to the drawings. In the following drawings, the same or similar parts are denoted by the same or similar reference signs. Furthermore, the embodiments will be described in the following order.1. First Embodiment2. Second Embodiment3. Third Embodiment

1. First Embodiment

[Configuration of Semiconductor Device]

FIG.1is a diagram illustrating a configuration example of a semiconductor device according to a first embodiment of the present disclosure. A semiconductor device1in the drawing is configured by mounting a semiconductor chip20on a substrate30.

The semiconductor chip20is a semiconductor chip including silicon (Si) or the like. A plurality of pads21is arranged on the semiconductor chip20. The pads21are electrode-like terminals that transmit a signal of the semiconductor chip20. The pads21can include metal such as aluminum (Al) or Au. Note that the semiconductor chip20is an example of an element described in the claims. The pads21are an example of an electrode described in the claims.

The substrate30is a circuit board disposed in an electronic device or the like. The semiconductor chip20is bare-chip mounted on the substrate30. A plurality of lands31is arranged on the substrate30. The lands31are conductors to which terminals such as the pads21of the semiconductor chip20are bonded. The lands31can include metal. Specifically, the lands31can include copper (Cu) and Au laminated in order. Note that the lands31are an example of an electrode described in the claims.

In a case where the semiconductor chip20is mounted on the substrate30, the pads21of the semiconductor chip20and the lands31of the substrate30are bonded. Here, the terminals10are disposed between the pads21and the lands31. The terminals10bond the pads21and the lands31.

[Configuration of Terminal]

FIG.2is a diagram illustrating a configuration example of a terminal according to the first embodiment of the present disclosure. The drawing is a diagram illustrating a configuration example of the terminal10, and is an enlarged view of a region where the terminal10of the semiconductor device1ofFIG.1is disposed.

As described above, the terminal10is disposed between the pad21of the semiconductor chip20and the land31of the substrate30to electrically connect the pad21of the semiconductor chip20and the land31of the substrate30. The terminal10includes unit lattices100and coupling portions11.

The unit lattices100are lattice-shaped structures formed by bonding a plurality of beams in a cube shape. The unit lattices100are arranged in a three-dimensional lattice shape to form the terminal10. Details of the configuration of the unit lattices100will be described later.

The coupling portions11couple adjacent unit lattices100among the plurality of unit lattices100. The unit lattices100are connected by the coupling portions11, and the plurality of unit lattices100is arranged in a three-dimensional lattice shape. The coupling portions11can include, for example, resin. Details of the configuration of the coupling portions11will be described later.

In the drawing, for convenience, nine unit lattices100arranged two-dimensionally are illustrated, but the number of unit lattices100is not limited, and a plurality of unit lattices100is further arranged in the depth direction of the paper surface of the drawing to form a three-dimensional shape.

Furthermore, the terminal10in the drawing includes conductive members12. The conductive members12are members having conductivity and disposed adjacent to the unit lattices100and the coupling portions11. The hatched regions in the drawing represent the conductive members12. This drawing illustrates an example in which films of the conductive members12are attached and disposed on surfaces of the unit lattices100and the coupling portions11. The conductive member12can include, for example, a resin in which particles of metal such as Ag are dispersed. By disposing the conductive member12, conductivity can be imparted to the terminals10and the pads21and the lands31can be electrically connected to each other even in a case where the unit lattices100and the coupling portions11including an insulator are used. The conductive member12can be formed by attaching a liquid resin in which metal particles are dispersed to the surfaces of the unit lattices100and the coupling portions11and curing the resin.

Furthermore, a connecting portion22is disposed between the pad21and the terminal10in the drawing, and a connecting portion32is disposed between the terminal10and the land31. The connecting portions22and32connect the terminal10, the pad21, and the land31. The connecting portions22and32include, for example, a conductive adhesive such as silver paste, solder having a low melting point, or the like, and bond the terminal10to the pad21and the land31. By arranging the connecting portions22and32, the terminal10can be electrically and mechanically connected to the pad21and the land31.

Furthermore, as the connecting portions22and32, an elastomer containing a liquid metal such as eutectic gallium indium (EGaIn), for example, can also be used. By applying the elastomer containing the eutectic gallium indium to the connecting portions between the pad21, the land31, and the terminal10and applying pressure thereto, liquid metals in the elastomer are bonded to each other, and electrical connection can be obtained. Furthermore, since the bonded liquid metal has a self-repairing function, the reliability of the connecting portion with the pad21and the like can be improved.

The semiconductor device1can be manufactured as follows. First, the connecting portions22are disposed on the pads21of the semiconductor chip20. Next, the terminals10are placed adjacent to the connecting portions22arranged on the pads21, and the connection portions22are cured to connect the terminals10to the pads21. Next, the connecting portions32are disposed on the lands31of the substrate30. Next, the semiconductor chip20is mounted on the substrate30while aligning the pads21, to which the terminals10are connected, with the lands31on which the connecting portions32are disposed. Here, the terminals10are disposed between the pads21and the lands31. Next, the connecting portions32are cured to connect the terminals10to the lands31. Through the above steps, the semiconductor chip20can be mounted on the substrate30.

[Configuration of Unit Lattice]

FIG.3is a diagram illustrating a configuration example of the unit lattice according to the embodiment of the present disclosure. The drawing is a diagram illustrating a configuration example of the unit lattice100. The unit lattice100in the drawing includes beams110, flexible members120, reinforcing members140, and flexible member coupling portions130. Note that, in the unit lattice100of the drawing, the coupling portions11are also illustrated. A cube101indicated by broken lines in the drawing is auxiliary lines representing the outer shape of the unit lattice100, and is not what constitutes the unit lattice100.

The beam110is formed in a rod shape and joined in a cube shape. The plurality of beams110is bonded to each other to form the outer shape of the unit lattice100. The beams110represent an example of being arranged between opposing vertices on each surface of the cube101. Furthermore, the beams110in the drawing represent an example in which two beams110intersect and are configured in a diagonal manner on each surface of the cube101. The beams110may include resin, for example.

The flexible members120bend the beams110inward of the cube101. The flexible member120is formed in a rod shape bulging toward the inside of the cube101, is disposed inside the cube101of the beams110, and has end portions joined to the vicinities of both ends of the beams110. The flexible member120may be disposed on each of the plurality of beams110. Furthermore, similarly to the beams110, the flexible members120can be configured in a shape in which the two flexible members120intersect on each surface of the cube101. The flexible members120can include a member having a higher thermal expansion coefficient than those of the beams110, for example, a resin having a higher thermal expansion coefficient than the member constituting the beams110. In this case, the flexible members120extend longer than the beams110when the temperature rises. With this configuration, the flexible members120are deformed into a shape that bends inward of the cube101as the temperature rises.

The flexible member coupling portions130are configured in a rod shape to couple the beams110and the flexible members120. The flexible member coupling portions130are bonded to a central portion of the beams110and a central portion of the flexible members120to couple the beams110and the flexible members120. The flexible member coupling portions130in the drawing are arranged on each surface of the cube101. By providing the flexible member coupling portions130, the beams110can be bent to the inner side of the cube101in a case where the flexible members120are bent as the temperature rises. The flexible member coupling portions130can include resin, for example.

The reinforcing members140reinforce the plurality of beams110bonded to each other. The reinforcing members140are disposed between two vertices facing each other through the center of the cube101, and are bonded to the beams110at these two vertices. This drawing illustrates an example in which the four reinforcing members140are configured to intersect at the central portion of the cube101. The reinforcing members140can include resin, for example.

Note that the coupling portions11can be disposed on a side of the beams110different from the side on which the flexible member coupling portions130are disposed.

As described above, the beams110, the flexible members120, the flexible member coupling portions130, the reinforcing members140, and the coupling portions11can include resin. To this resin, a photocurable resin may be applied. Specifically, these beams110and the like can include polyethylene glycol diacrylate (PEGDA) imparted with photo-curability. Therefore, the terminal10can be manufactured using a 3D printer or the like.

By configuring the terminal10with the plurality of unit lattices100connected by the coupling portions11, flexibility can be imparted to the terminal10. As a result, even in a case where the semiconductor device1is distorted with an increase in temperature due to a difference in thermal expansion coefficient and the like between the semiconductor chip20and the substrate30, and stress is applied to the terminals10, the stress can be dispersed. The terminals10can be prevented from being damaged.

Note that the thermal expansion coefficient of PEGDA is 1.56×10−4[K−1]. The thermal expansion coefficient can be adjusted by adding a reinforcing material to the PEGDA. Specifically, the thermal expansion coefficient of PEGDA can be reduced by adding Cu nanoparticles (particle size: 50 to 80 nm). This is because the thermal expansion coefficient of Cu to be added is as low as 2×10−5. For example, by adding 5% of Cu nanoparticles, the thermal expansion coefficient of PEGDA can be reduced to 5.1×10−5[K−1].

Therefore, the flexible members120include PEGDA, and the beams110, the flexible member coupling portions130, the reinforcing members140, and the coupling portions11include PEGDA reinforced by adding Cu nanoparticles. As a result, the thermal expansion coefficient of the flexible members120can be made higher than the thermal expansion coefficient of the beams110and the like, and the beams110can be bent to the inner side of the cube101when the temperature rises. The beams110can be deflected to the inside of the unit lattice100.

[Shrinkage of terminal]

FIGS.4A and4Bare views illustrating an example of shrinkage of the terminal according to the embodiment of the present disclosure. This drawing is a diagram illustrating behavior of the coupled unit lattices100in a case where the temperature of the terminals10rises. Furthermore, the drawing is a view illustrating a pair of beams110, the flexible members120, the flexible member coupling portions130, and the reinforcing members140of each of the unit lattices100aand100bconnected by the coupling portion11.

FIG.4Ais a view illustrating a state of the unit lattices100aand100bbefore the temperature is raised. “D” inFIG.4Arepresents an interval between the unit lattices100aand100bbefore the temperature is raised.

FIG.4Bis a view illustrating a state of the unit lattices100aand100bafter the temperature is raised. As the temperature rises, the flexible members120extend. As described above, the flexible members120are configured in a shape in which both ends are joined to the beams110and the reinforcing members140and a central portion bulges inside the cube101. Therefore, in a case where the temperature rises, the flexible members120extend and the central portion bends inward of the cube101. As a result, the beams110connected to the flexible members120by the flexible member coupling portions130are drawn into the cube101and bent. In a case where the deflection amount of the beams110is larger than the elongation amount of the coupling portions11, the unit lattices100aand100bbecomes close to each other. “D” inFIG.4Brepresents an interval between the unit lattices100aand100bafter the temperature rise, and is narrower than “D” inFIG.4A. The terminal10configured by connecting such unit lattices100has a property that the volume decreases as the temperature rises. Note that, for the sake of convenience, inFIG.4B, description of elongation of members other than the flexible members120caused by a temperature rise is omitted.

As described above, by making the thermal expansion coefficient of the flexible members120higher than that of the beams110, the thermal expansion coefficient of the terminal10can be set to a negative value. In addition, the terminal10having an arbitrary thermal expansion coefficient can be configured by adjusting the thermal expansion coefficient of the flexible members120, the beams110, and the like. For example, a terminal10having a thermal expansion coefficient of the value “zero” can also be configured. The terminals10having a thermal expansion coefficient corresponding to the thermal behavior of the semiconductor chip20and the substrate30can be arranged, and damage of the bonded portion between the semiconductor chip20and the substrate30can be prevented.

[Method of Manufacturing Terminal]

FIG.5is a diagram illustrating an example of a method of manufacturing the terminal according to an embodiment of the present disclosure. The drawing is a diagram illustrating an example of a 3D printer device that manufactures the terminal10. The 3D printer device in the drawing includes a sample holding unit301, a material conveying disk302, a motor303, a Z-axis drive motor304, a material supply unit305, a dispenser306, an image output unit307, an optical system including a lens308and a reflector309, and a control unit310.

The sample holding unit301holds the terminal10which is being manufactured. The terminal10is held on the lower surface of the sample holding unit301.

The dispenser306holds a resin material constituting the beams110and the like. The beams110and the like include a photocurable resin. The dispenser306holds the uncured resin material. The dispenser306supplies a resin material to the material conveying disk302described later under the control of the material supply unit305. The dispenser306which is suitable for the type of resin material can be disposed.

The material supply unit305supplies the material resin to the dispenser306under the control of the control unit310. The material supply unit305supplies, to the dispenser306, a resin material suitable for the part of the terminal10to be formed.

The material conveying disk302conveys the resin material supplied by the dispenser306to a section for forming the terminal10. The material conveying disk302rotates to convey the resin material. Note that the section for forming the terminal10is an area immediately below the sample holding unit301.

The motor304rotates the material conveying disk302. A stepping motor can be used as the motor304.

The image output unit307emits light for curing the resin material under the control of the control unit310. The image output unit307emits light on the basis of image data configured by decomposing the image of the terminal10into multiple layers in the Z-axis direction.

The optical system guides the light emitted from the image output unit307to the unit for forming the terminal10.

The Z-axis drive motor304moves the sample holding unit301in the Z-axis direction. The Z-axis drive motor304moves the sample holding unit301upward in the drawing at a speed corresponding to the formation of the terminal10.

The control unit310controls the entire manufacturing apparatus. The control unit310controls the image output unit307and the material supply unit305on the basis of the configuration data of the terminal10to form the terminal10on the lower surface of the sample holding unit301. For example, in a case where the beams110and the reinforcing members140are formed, a material resin (PEGDA before curing in which Cu is dispersed) used for the beams110and the like is supplied from the dispenser306to the material conveying disk302. On the other hand, light corresponding to one layer of image data for forming the beams110and the like is emitted from the image output unit307and guided to the section for forming the terminal10. As a result, the material resin is cured at the section for forming the terminal10, and the beams110and the like for one layer are formed. Next, a material resin (PEGDA before curing) of the flexible members120is supplied from the dispenser306to the material conveying disk302, and light for one layer of image data for forming the flexible members120is emitted from the image output unit307, and the flexible members120for one layer is formed. By performing this for all the layers, the terminal10can be manufactured.

As described above, the terminal10of the first embodiment of the present disclosure includes the unit lattices100and the coupling portions11, and is configured to have a flexible structure. With this configuration, in a case where stress is applied to the terminal10due to distortion caused by an increase in the temperature of the semiconductor chip20and the substrate30, the stress can be dispersed to prevent damage to the terminal10.

2. Second Embodiment

The terminal10according to the above-described first embodiment is configured to have a single thermal expansion coefficient. On the other hand, a terminal according to a second embodiment of the present disclosure is different from the above-described first embodiment in that terminal regions having different thermal expansion coefficients are stacked.

[Configuration of Semiconductor Device]

FIG.6is a diagram illustrating a configuration example of a semiconductor device according to the second embodiment of the present disclosure. The drawing is a diagram illustrating a configuration example of the semiconductor device1similarly toFIG.1. The semiconductor device1is different from the semiconductor device1ofFIG.1in that a terminal50is disposed instead of the terminal10.

The terminal50in the drawing includes two stacked terminal regions18and19. Each of the terminal regions18and19is a terminal region including the unit lattices100and the coupling portions11. The terminal regions18and19are disposed adjacent to pads21and lands31, respectively. The flexible members120disposed in the unit lattices100in the terminal regions18and19can be configured to have different thermal expansion coefficients. With this arrangement, the terminal regions18and19can be configured to have different thermal expansion coefficients. By configuring the terminal regions18and19to have thermal expansion coefficients corresponding to the pads21and the lands31, respectively, stress applied to the terminals50can be concentrated on the bonded portions of the terminal regions18and19. The stress of the connecting portion between the terminal50and the pads21and the lands31can be reduced.

Since the configuration of the terminal50other than this part is similar to the configuration of the terminal10described in the first embodiment of the present disclosure, the description thereof will be omitted.

As described above, in the terminal50according to the second embodiment of the present disclosure, by arranging the terminal regions18and19having different thermal expansion coefficients, the stress applied to the connecting portion between the terminal50and the pad21and the land31can be reduced. Breakage in the connecting portion between the terminal50and the pad21and the land31can be prevented.

3. Third Embodiment

In the terminal10of the first embodiment described above, the film-like conductive members12are disposed to be attached to the surfaces of the unit lattices100and the coupling portions11. On the other hand, a terminal of a third embodiment of the present disclosure is different from the above-described first embodiment in that a plurality of unit lattices100connected by coupling portions11is filled with a conductive member.

[Configuration of Terminal]

FIG.7is a diagram illustrating a configuration example of a terminal according to the third embodiment of the present disclosure. The drawing is a diagram illustrating a configuration example of the terminal10similarly toFIG.2. The terminal10is different from the terminal inFIG.2in that the connecting portions22and32are omitted and a conductive member13is disposed as a substitute for the conductive members12.

The conductive member13is a conductive member which is arranged by filling a plurality of unit lattices100connected by the coupling portions11. The conductive member13can include a liquid metal such as eutectic gallium indium. The terminal10can be configured by impregnating and filling the unit lattices100with the conductive member13. In this case, the connecting portions22and32can be omitted. Furthermore, the conductive member13may be formed by dispersing metal particles in a resin having high flexibility even after curing.

In addition, a material containing nanoparticles of Ag or Cu whose size and shape are controlled so as to have plasmon resonance can be filled in the plurality of unit lattices100connected by the coupling portions11. After the filling, the nanoparticles are irradiated with light and fired by a thermal conversion effect by resonance of light. Here, the firing of the nanoparticles can be adjusted by adjusting the intensity and frequency of the light to be irradiated, and the flexibility of the terminal10can be adjusted. Furthermore, it is also possible to adjust a condition of light to be emitted according to an element such as the semiconductor chip20and arrange a terminal10having different flexibility for each element.

Since the configuration of the terminal10other than this part is similar to the configuration of the terminal10described in the first embodiment of the present disclosure, the description thereof will be omitted.

As described above, in the terminal10according to the third embodiment of the present disclosure, the connecting portions22and32can be omitted by disposing the conductive member13filled in the plurality of unit lattices100connected by the coupling portions11. The configuration of the semiconductor device1can be simplified.

Note that the configuration of the terminal10according to the third embodiment can be combined with other embodiments. Specifically, the conductive member13ofFIG.7can be used instead of the conductive member12ofFIG.6.

Finally, note that the description of each of the above-described embodiments is an example of the present disclosure, and the present disclosure is not limited to the above-described embodiments. Therefore, it is needless to say that various modifications can be made according to the design and the like without departing from the technical idea according to the present disclosure even with other embodiments which are not the above-described respective embodiments.

Furthermore, the effects described in the present specification are merely examples and are not limited. In addition, there may be additional effects.

In addition, the drawings in the above-described embodiments are schematic, and dimensional ratios and the like of the respective portions do not necessarily coincide with actual ones. In addition, it is needless to say that the drawings include portions having different dimensional relationships and ratios.

Note that the present technology may have following configurations.

(1) A terminal that is disposed between an electrode of an element and an electrode of a substrate on which the element is mounted, and electrically connects the electrode of the element and the electrode of the substrate, the terminal including:a plurality of unit lattices formed by bonding a plurality of beams in a cube shape; anda coupling portion that couples adjacent unit lattices among the plurality of unit lattices.

(2) The terminal according to (1), in which the beams include resin.

(3) The terminal according to (1) or (2), in which the coupling portion includes resin.

(4) The terminal according to any one of (1) to (3), further including a conductive member disposed adjacent to the beams and the coupling portion and having conductivity.

(5) The terminal according to any one of (1) to (4), further including:a flexible member configured in a rod shape bulging toward an inner side of the cube shape, disposed inside the cube shape of the beams, having end portions bonded to vicinities of both ends of the beams, and configured to be bent toward the inner side of the cube shape in a case where temperature rises; anda flexible member coupling portion bonded to a central portion of the beam and a central portion of the flexible member to connect the beam and the flexible member,in which the coupling portion is bonded to the central portion of the beam of each of the adjacent unit lattices to connect the adjacent unit lattices.

(6) The terminal according to (5), in which the flexible member has a higher thermal expansion coefficient than those of the beams.

(7) The terminal according to (5), in which the flexible member includes resin.

(8) The terminal according to (5), in which the flexible member coupling portion includes resin.

(9) The terminal according to any one of (1) to (8), further including a reinforcing member configured to be bonded to the plurality of beams at two vertices facing each other through a center of the cube shape of the unit lattice.

(10) The terminal according to (9), in which the reinforcing member includes resin.

(11) A connection method including electrically connecting an electrode of an element and an electrode of a substrate by providing a terminal between the electrode of the element and the electrode of the substrate on which the element is mounted, the terminal including: a plurality of unit lattices formed by bonding a plurality of beams in a cube shape; and a coupling portion that couples adjacent unit lattices among the plurality of unit lattices.

REFERENCE SIGNS LIST

1Semiconductor device10,50Terminal11Coupling portion12Conductive member18,19Terminal region20Semiconductor chip21Pad22,32Connecting portion30Substrate31Land100,100a,100bUnit lattice101Cube110Beam120Flexible member130Flexible member coupling portion140Reinforcing member