WO2011087119A1 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- WO2011087119A1 WO2011087119A1 PCT/JP2011/050637 JP2011050637W WO2011087119A1 WO 2011087119 A1 WO2011087119 A1 WO 2011087119A1 JP 2011050637 W JP2011050637 W JP 2011050637W WO 2011087119 A1 WO2011087119 A1 WO 2011087119A1
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Definitions
- the present invention relates to a semiconductor device and a method of manufacturing the same.
- a semiconductor chip mounted on an island of a lead frame and a semiconductor device having a mold resin that covers the semiconductor chip are known.
- the semiconductor device is manufactured through a die bonding step of fixing the diced semiconductor chip onto the island using an adhesive or the like.
- the semiconductor chip When it is desired to electrically connect the island and the semiconductor chip, for example, silver paste is placed on the silver-plated island, and the semiconductor chip is lightly pressed and adhered thereto, or between the gold-plated island and the semiconductor chip A method is used in which the semiconductor chip is fixed to the island of the lead frame by, for example, sandwiching a small piece of gold tape and forming a eutectic of gold and silicon.
- an insulating paste made of an acrylic resin or epoxy resin is placed on the island, and the semiconductor chip is lightly pressed and adhered thereto, or DAF (Die Attach Film)
- DAF Die Attach Film
- the method of fixing a semiconductor chip to an island using an insulating film is used.
- packages where islands such as MAP (Mold Array Package) and QFN (Quad Flat Non-leaded) packages are exposed to the outside, it is possible to prevent current leakage to the external substrate by insulating the islands from the semiconductor chip Heat dissipation can be secured.
- the semiconductor chip is inclined at the time of die bonding, or a void is generated in the insulating paste, so that the electrical insulation strength between the island and the semiconductor chip could have fallen.
- Patent Document 1 discloses a technical idea that uses both an insulating paste and an insulating film when bonding a semiconductor chip to an island.
- FIG. 23 shows the semiconductor device shown in FIG. 2 of Patent Document 1.
- the semiconductor device 900 includes a semiconductor chip 902, an insulating film 904, an insulating adhesive 906, and an island 908.
- the insulating film 904 is interposed between the semiconductor chip 902 and the island 908, even if a void is generated in the insulating adhesive 906, the space between the semiconductor chip 902 and the island 908 can be obtained.
- the electrical insulation strength is maintained above a predetermined level.
- the elastic modulus at normal temperature of the insulating film 904 is about 3000 MPa. Therefore, when bonding a wire on the semiconductor chip 902, energy for wire bonding is absorbed by the insulating film 904. This has contributed to the quality degradation.
- the inventors of the present invention have also found that when the size of the semiconductor chip 902 mounted on the island 908 is reduced, the occurrence rate of the above defects is increased.
- the present invention overcomes these problems, and in order to enable high-precision wire bonding while securing high insulation between the semiconductor chip and the island, a semiconductor in which the semiconductor chip is more firmly fixed on the island
- An object of the present invention is to provide an apparatus and a method of manufacturing the same.
- a semiconductor device provided by the first aspect of the present invention comprises an island, a first insulating material, a second insulating material having a higher elastic modulus than the first insulating material, and a bonding pad.
- a semiconductor chip having one main surface and the other main surface opposite to the one main surface and fixed to the island via the first insulating material and the second insulating material; And the second insulating material is in contact with both the island and the semiconductor chip.
- the first insulating material is formed on the island, and the second insulating material is a side surface connected to both the other main surface, the one main surface and the other main surface, It is fixed in contact with the first insulating material and the island.
- the first insulating material extends over the entire periphery of the other major surface.
- the first insulating material is covered by the second insulating material.
- the second insulating material is an insulating paste.
- the elastic modulus of the second insulating material is 3000 MPa or more and 10000 MPa or less.
- the elastic modulus of the first insulating material is 1000 MPa or more and 5000 MPa or less.
- a part of the island is exposed to the outside of the semiconductor device.
- the islands are supported by hanging leads.
- the semiconductor device further includes a third insulating material fixed to the other main surface.
- the volume resistivity of the first insulating material is 1000 G ⁇ ⁇ cm or more.
- the first insulating material is fixed on the island so as not to exceed the periphery of the other major surface.
- the other main surface has a quadrilateral shape
- the first insulating material is fixed on the island so as not to go beyond two opposing sides of the other main surface.
- the first insulating material has a cross shape intersecting on the island facing the central portion of the other main surface, and is fixed to the island.
- the first insulating material is divided into a plurality of small pieces discretely disposed in a region opposed to the other main surface on the island.
- the first insulating material has a through hole reaching the island.
- the first insulating material covers the other main surface
- the second insulating material has a side surface connected to the one main surface and the other main surface, the first insulation It is fixed in contact with the material and the island.
- the first insulating material is covered by the second insulating material.
- the elastic modulus of the second insulating material is 3000 MPa or more and 10000 MPa or less.
- the second insulating material is an insulating paste.
- the semiconductor device further includes a plating layer formed in a region surrounding the region in contact with the second insulating material of the island and including an outer edge reaching at least a part of the outer edge of the island.
- the outer edge is in the form of a frame that reaches all of the outer edges of the islands.
- the island is rectangular, and the outer edge is in contact with the four corners of the island and has a portion spaced apart between the corners.
- the semiconductor device further comprises a suspension lead for supporting the island, and the plating layer further includes a suspension lead portion formed on the suspension lead.
- the plated layer is made of Au.
- the semiconductor chip further includes an input lead, an output lead, and a ground lead electrically connected to the semiconductor chip, the semiconductor chip is connected to the ground lead at the ground potential, and a positive voltage is applied to the input lead.
- the output lead can be set to a negative potential with respect to the ground potential.
- a negative voltage generation circuit that generates a negative voltage with respect to the reference potential.
- system power supply is configured to generate a plurality of positive voltages with respect to the reference voltage.
- a method of manufacturing a semiconductor device comprising the steps of: forming an element and a bonding pad on one main surface of a semiconductor wafer; Bonding the first insulating material to the first semiconductor material, dicing the semiconductor wafer into the individual semiconductor chips, bonding the semiconductor chip to the lead frame via the second insulating material, and Wire bonding with the inner lead of the lead frame; and molding the semiconductor chip and the lead frame.
- the first insulating material is coated on the other main surface of the semiconductor wafer by spin coating.
- FIG. 1 is a schematic cross-sectional view showing a semiconductor device according to a first embodiment of the present invention. It is a cross-sectional schematic diagram which shows the semiconductor device concerning the 2nd Embodiment of this invention. It is the top view which looked at the semiconductor device concerning a 2nd embodiment of the present invention from the principal surface side. It is a top view which shows the 1st modification of the semiconductor device concerning a 2nd embodiment of the present invention. It is a top view which shows the 2nd modification of the semiconductor device concerning a 2nd embodiment of the present invention. It is a top view which shows the 3rd modification of the semiconductor device concerning a 2nd embodiment of the present invention.
- FIG. 14 is an enlarged perspective view of a main part showing a lead of the semiconductor device shown in FIG. 13; It is a schematic block diagram which shows the semiconductor chip used for the semiconductor device which concerns on this invention.
- FIG. 17 is a schematic circuit diagram for illustrating the function of the semiconductor chip of FIG. 16;
- FIG. 17 is a schematic circuit diagram for illustrating the function of the semiconductor chip of FIG. 16;
- FIG. 17 is a schematic cross-sectional view for explaining an internal structure of the semiconductor chip of FIG. 16;
- It is a top view which shows the modification of the semiconductor device concerning the 5th Embodiment of this invention.
- FIG. 1 shows a semiconductor device according to a first embodiment of the present invention.
- the semiconductor device 100 includes islands 102, leads 104a and 104b, semiconductor chips 106, bonding pads 108a and 108b, a first insulating material 110, a second insulating material 112, bonding wires 114a and 114b, and a molding resin 116.
- the island 102 is a so-called die pad portion for mounting the semiconductor chip 106 by a die bonding process, and normally, the same material as the leads 104a and 104b is used.
- materials of the island 102 and the leads 104a and 104b Cu--Fe--P which is a Cu-based material, an Fe 58% Ni 42% alloy which is a Fe-based material, or the like is used.
- the back surface of the island 102 is exposed for mounting on an external substrate (not shown) for the purpose of enhancing heat dissipation.
- the leads 104a and 104b are electrically connected to the bonding pads 108a and 108b, and are used as connection terminals when connecting to an external substrate.
- FIG. 1 shows a so-called QFN and a configuration in which there is no outer lead
- the present invention is not limited to the QFN, and SOP (Small Outline Package), SOJ (Small Outline J-leaded), QFP (Quad Flat)
- SOP Small Outline Package
- SOJ Small Outline J-leaded
- QFP Quad Flat
- Various package configurations such as Package (Leaded Chip Carrier), LCC (Ball Grid Array), LGA (Land Grid Array), TCP (Tape Carrier Package), CSP (Chip Size Package), MAP (Mold Array Package), etc. Is applicable.
- the island 102 is supported by a suspension lead (not shown).
- inner leads are disposed at predetermined intervals between the hanging leads and the other hanging leads.
- Bonding pads 108 a and 108 b are formed on one main surface 106 a of the semiconductor chip 106. Inside the semiconductor chip 106, an integrated circuit including elements such as a transistor, a diode, and a resistor is formed. The first insulating material 110 is fixed to the other major surface 106 b facing the island 102.
- the bonding pads 108a and 108b are connected to an integrated circuit formed inside the semiconductor chip 106, and are connected to the leads 104a and 104b by bonding wires 114a and 114b.
- Al, Cu or the like is used as the material of the bonding pads 108a and 108b, and Au, Cu, Al or the like is used as the material of the bonding wires 114a and 114b.
- the semiconductor chip 106 is fixed on the island 102 by the first insulating material 110 and the second insulating material 112.
- polyamide imide, polyimide, alumina, ceramics or the like is used as the first insulating material 110.
- the first insulating material 110 is bonded as an insulating film to the other principal surface 106b of the semiconductor wafer before dicing, ie, the surface on which the bonding pads 108a and 108b are not formed, or by spin coating a liquid resin, It is applied to the other main surface 106 b of the semiconductor wafer.
- a resin for back surface coating generally used in CSP can be used as the first insulating material 110.
- the first insulating material 110 is fixed to the other major surface 106 b of the semiconductor chip 106 by adhesion or spin coating of an insulating film. For this reason, compared with the case where a so-called insulating paste is used, the possibility of the occurrence of a void in the inside of the first insulating material 110 is low. Therefore, it is possible to improve the insulation performance. For example, when a polyimide resin is used, it is possible to obtain a withstand voltage of about 800 V with a thickness of 20 ⁇ m. Although the thickness of the first insulating material 110 may be appropriately adjusted according to the required withstand voltage, the first insulating material may be used to obtain a high withstand voltage without increasing the size of the entire semiconductor device. It is desirable that the thickness 110 be 5 ⁇ m to 50 ⁇ m. More preferably, the thickness of the first insulating material 110 is 10 ⁇ m to 25 ⁇ m.
- the first insulating material 110 has a modulus of elasticity of 1000 MPa or more and 5000 MPa or less at normal temperature in order to prevent cracks of the other main surface 106 b of the semiconductor chip 106 due to thermal stress and maintain high withstand voltage and adhesiveness. Is desirable.
- the elastic modulus of the first insulating material 110 can be determined by adjusting the drying temperature, the drying time, and the like of the insulating material.
- the first insulating material 110 desirably has a volume resistivity of 1000 G ⁇ ⁇ cm or more.
- the second insulating material 112 acrylic resin, silicon resin, epoxy resin, polyimide resin, or the like is used as the second insulating material 112.
- the second insulating material 112 adheres between the semiconductor chip 106 and the island 102 as an insulating paste.
- the semiconductor chip 106 in which the first insulating material 110 is fixed to the other major surface 106 b is bonded onto the paste-like second insulating material 112 applied on the island 102 by a die bonder. At this time, even if the semiconductor chip 106 is inclined, since the first insulating material 110 is fixed to the other main surface 106 b of the semiconductor chip 106, the first insulation is always between the semiconductor chip 106 and the island 102. The material 110 intervenes. Thereby, the withstand voltage between the semiconductor chip 106 and the island 102 is secured.
- the second insulating material 112 is in the form of paste at the time of die bonding, voids may be generated inside.
- the first insulating material 110 fixed to the other main surface 106 b of the semiconductor chip 106 prevents the void from reaching the semiconductor chip 106. Therefore, even if a void occurs in the second insulating material 112, the withstand voltage between the semiconductor chip 106 and the island 102 is ensured.
- the elastic modulus of the second insulating material 112 at normal temperature is preferably 3000 MPa or more and 10000 MPa or less in order to ensure high adhesion while preventing cracking of the second insulating material 112. If the modulus of elasticity is less than 3000 MPa, the adhesive strength is reduced, and if the modulus of elasticity exceeds 10000 MPa, cracks are likely to occur.
- the second insulating material 112 needs a high modulus of elasticity to firmly bond the semiconductor chip 106 to the island 102.
- the first insulating material 110 may be made of a material having a lower elastic modulus than the second insulating material 112 in order to reduce the thermal stress applied to the other major surface 106 b of the semiconductor chip 106. desirable.
- the second insulating material 112 is thermally cured in contact with the island 102, the first insulating material 110, and the side surface of the semiconductor chip 106, so that the semiconductor chip 106 is firmly fixed to the island 102.
- the elastic modulus of the second insulating material 112 can be adjusted by changing the drying temperature, the drying time, and the like of the insulating material.
- the semiconductor chip 106 be half or more buried in the second insulating material 112. More preferably, as shown in FIG. 1, the semiconductor chip 106 is die-bonded so that the second insulating material 112 reaches the side upper end 106 s of the semiconductor chip 106. By this, the adhesion of the semiconductor chip 106 can be enhanced. In addition, even if the bonding wires 114a and 114b and the side surface of the semiconductor chip 106 are temporarily in contact with each other, electrical short between the both can be prevented.
- the semiconductor chip 106 is resin-sealed with the mold resin 116 in order to protect the semiconductor chip 106 from external stress such as humidity, temperature, and mechanical pressure.
- the mold resin 116 various materials such as epoxy resin, phenol resin, unsaturated polyester resin, polyurethane resin, silicon resin, polyimide resin, and the like can be used.
- a polyimide resin is used as the second insulating material 112
- the semiconductor chip 106 is fixed on the island 102 via the first insulating material 110 and the second insulating material 112, a high dielectric breakdown voltage is secured between the semiconductor chip 106 and the island 102. While being possible, it is possible to firmly fix the semiconductor chip 106 on the island 102 by the second insulating material 112 having a high elastic modulus. Therefore, bonding can be performed with high positioning accuracy, for example, at the time of wire bonding.
- the suspension leads and the inner leads may be electrically shorted even if they are temporarily shorted. Can prevent an electrical accident between the island 102 and the inner lead supported by the
- the first insulating material 110 also has an effect of alleviating the stress caused by the difference in thermal expansion coefficient between the semiconductor chip 106 and the second insulating material 112 and preventing the semiconductor chip 106 from being cracked.
- FIG. 2 shows a semiconductor device according to a second embodiment of the present invention.
- the same parts as those shown in FIG. 1 are designated by the same reference numerals and their detailed description will be omitted.
- the semiconductor device 150 differs from that in FIG. 1 in that the first insulating material 118 is not fixed to the semiconductor chip 106 but fixed to the island 102.
- the semiconductor device 150 includes islands 102, leads 104a and 104b, semiconductor chips 106, bonding pads 108a and 108b, a first insulating material 118, a second insulating material 112, bonding wires 114a and 114b, and a molding resin 116.
- the semiconductor chip 106 is secured on the island 102 by a first insulating material 118 and a second insulating material 112.
- first insulating material 118 polyamide imide, polyimide, alumina, ceramics or the like is used.
- the first insulating material 118 is secured on the island 102 as an insulating film.
- the first insulating material 118 is secured on the island 102 as an insulating film. For this reason, compared with the case where a so-called insulating paste is used, the possibility of the occurrence of a void in the inside of the first insulating material 118 is low. Thus, it is possible to enhance the insulation performance of the first insulating material 118. For example, when a polyimide resin is used, it is possible to obtain a withstand voltage of about 800 V with a thickness of 20 ⁇ m. Although the thickness of the first insulating material 118 may be appropriately adjusted in accordance with the required withstand voltage, the first insulating material 118 is required to obtain a high withstand voltage without increasing the size of the entire semiconductor device.
- the thickness of the material 118 is desirably 5 ⁇ m to 50 ⁇ m. If the thickness is less than 5 ⁇ m, the withstand voltage is lowered, and if it exceeds 50 ⁇ m, the adhesion is lowered and the occurrence of voids is also increased. In addition, the inclination of the semiconductor chip 106 also increases.
- the material and shape of the second insulating material 112 in the second embodiment are the same as in the first embodiment.
- the second insulating material 112 is a B-stage during die bonding, that is, in the form of a paste, so that a void may be generated inside.
- the first insulating material 118 fixed on the island 102 maintains the insulation between the semiconductor chip 106 and the island 102. Therefore, even if a void occurs in the second insulating material 112, the withstand voltage between the semiconductor chip 106 and the island 102 can be maintained at a predetermined size or more.
- the elastic modulus of the second insulating material 112 at normal temperature is preferably 3000 MPa or more and 10000 MPa or less in order to ensure high adhesion while preventing cracking of the second insulating material 112.
- the modulus of elasticity is less than 3000 MPa, the adhesiveness is lowered, and when the modulus of elasticity exceeds 10000 MPa, cracks easily occur.
- the second insulating material 112 have a higher elastic modulus than the first insulating material 118 in order to firmly fix the semiconductor chip 106 to the island 102.
- the second insulating material 112 is thermally cured in contact with the island 102, the first insulating material 118, and the side surface of the semiconductor chip 106 and the other major surface 106b. Therefore, the semiconductor chip 106 is firmly fixed to the island 102 by the second insulating material 112.
- the elastic modulus of the second insulating material 112 can be adjusted by changing the drying temperature, the drying time, and the like of the insulating material.
- the semiconductor chip 106 In order for the semiconductor chip 106 to be firmly fixed on the island 102, it is desirable that the semiconductor chip 106 be half or more buried in the second insulating material 112. More preferably, as shown in FIG. 2, the semiconductor chip 106 is die-bonded so that the second insulating material 112 reaches the side upper end 106 s of the semiconductor chip 106.
- the bonded area of the island 102 and the second insulating material 112 it is more desirable to increase the bonded area of the island 102 and the second insulating material 112 so that the island 102 and the second insulating material 112 are more firmly bonded.
- the width W1 of the first insulating material 118 smaller than the width W2 of the semiconductor chip 106, the bonded area of the island 102 and the second insulating material 112 can be increased.
- the first insulating material 118 does not exceed the outer periphery of the other main surface 106b of the semiconductor chip 106, (2) the first The insulating material 118 does not exceed the two opposing sides of the other main surface 106b of the semiconductor chip 106. (3) The first insulating material 118 intersects the central portion of the other main surface 106b of the semiconductor chip 106 in top view. A cross-shaped method may be considered.
- FIG. 3 is a plan view of the semiconductor device 150 shown in FIG. However, for convenience of explanation, the mold resin 116 is transparent, and the outer periphery of the mold resin 116 is indicated by a frame (dotted line) 116 a.
- the semiconductor device 150 includes an island 102, a plurality of leads 104, a semiconductor chip 106, a plurality of bonding pads 108, a first insulating material 118, a second insulating material 112, a plurality of bonding wires 114, and a molding resin 116.
- the leads 104a and 104b shown in FIG. 2 are included in the plurality of leads 104
- the bonding pads 108a and 108b are included in the plurality of bonding pads 108
- the bonding wires 114a and 114b are a plurality of Bonding wire 114 is included.
- the semiconductor chip 106 is electrically connected to the leads 104 aligned near the outer periphery of the mold resin 116 via the bonding pads 108 aligned on the one main surface 106 a and the bonding wires 114.
- the first insulating material 118 is fixed on the island 102 so as not to extend beyond the outer periphery of the semiconductor chip 106. In order to prevent the bonding energy during wire bonding from being absorbed by the first insulating material 118, it is more desirable that the first insulating material 118 be fixed so as to avoid directly under the bonding pad 108. That is, as shown in FIG. 3, when the bonding pad 108 is provided in the vicinity of the outer periphery of one main surface 106 a of the semiconductor chip 106, the first insulating material 118 is the center of the other main surface 106 b of the semiconductor chip 106. It is desirable to be provided on the island 102 in a range that does not reach the area where the bonding pad 108 is provided.
- the semiconductor chip 106 since the semiconductor chip 106 is fixed on the island 102 via the first insulating material 118 and the second insulating material 112, a high dielectric breakdown voltage is secured between the semiconductor chip 106 and the island 102. it can. Further, the semiconductor chip 106 can be firmly fixed on the island 102 by the second insulating material 112 having a high elastic modulus. For this reason, it is possible to perform high-precision bonding, for example, at the time of wire bonding.
- FIG. 4 is a modification of the semiconductor device 150 shown in FIG.
- the same parts as those shown in FIG. 3 are denoted by the same reference numerals, and the detailed description will be omitted.
- the semiconductor device 200 is different from that in FIG. 3 in that the shape of the first insulating material 120 is a shape that does not exceed the two opposing sides 106 c and 106 d on the other main surface 106 b of the semiconductor chip 106. That is, the first insulating material 120 is configured to be accommodated inside the two sides 106c and 106d, and protrudes from the two sides 106e and 106f.
- the semiconductor device 200 includes the island 102, the lead 104, the semiconductor chip 106, the bonding pad 108, the first insulating material 120, the second insulating material 112, the bonding wire 114, and the molding resin 116.
- FIG. 5 shows another modification of the semiconductor device 150 shown in FIG. The same parts as those in the configuration shown in FIG.
- the semiconductor device 250 has a configuration shown in FIG. 3 in that the shape of the first insulating material 122 is in the shape of a cross that intersects the center portion of the other major surface 106 b of the semiconductor chip 106 on the island 102 facing the other. It is different.
- the semiconductor device 250 includes the island 102, the lead 104, the semiconductor chip 106, the bonding pad 108, the first insulating material 122, the second insulating material 112, the bonding wire 114, and the molding resin 116.
- FIG. 6 shows still another modification of the semiconductor device 150 shown in FIG.
- the same parts as those in the configuration shown in FIG. 3 are denoted by the same reference numerals, and the detailed description will be omitted.
- the semiconductor device 300 differs from FIG. 3 in that the first insulating material 124 is formed on the island 102 facing the vicinity of the diagonal line in the other major surface 106 b of the semiconductor chip 106.
- the semiconductor device 300 includes the island 102, the lead 104, the semiconductor chip 106, the bonding pad 108, the first insulating material 124, the second insulating material 112, the bonding wire 114, and the molding resin 116.
- the contact between the semiconductor chip 106 and the island 102 can be prevented even with respect to the inclination of the semiconductor chip 106 in the diagonal direction, and the die is more stable. Bonding is possible.
- FIG. 7 shows a semiconductor device according to a third embodiment of the present invention.
- the semiconductor device 350 differs from the configuration shown in FIG. 2 in that the first insulating material 126 is divided into a plurality of small pieces discretely disposed on the island 102.
- the same parts as in FIG. 2 are assigned the same reference numerals and detailed explanations thereof will be omitted.
- the semiconductor device 350 includes islands 102, leads 104a and 104b, semiconductor chips 106, bonding pads 108a and 108b, a first insulating material 126, a second insulating material 112, bonding wires 114a and 114b, and a mold resin 116.
- the semiconductor chip 106 is secured on the island 102 by a first insulating material 126 and a second insulating material 112.
- the first insulating material 126 and the second insulating material 112 in the third embodiment are the same in material and manufacturing method as the first insulating material 118 and the second insulating material 112 in the second embodiment. .
- FIG. 8 is a plan view of the semiconductor device 350 shown in FIG.
- the same parts as those in FIG. 7 are assigned the same reference numerals and detailed explanations thereof will be omitted.
- the mold resin 116 is transparent, and the outer periphery of the mold resin 116 is indicated by a frame (dotted line) 116 a.
- the semiconductor device 350 includes an island 102, a plurality of leads 104, a semiconductor chip 106, a plurality of bonding pads 108, a first insulating material 126, a second insulating material 112, a plurality of bonding wires 114, and a molding resin 116.
- the leads 104a and 104b shown in FIG. 7 are included in the plurality of leads 104
- the bonding pads 108a and 108b are included in the plurality of bonding pads 108
- the bonding wires 114a and 114b are a plurality of Bonding wire 114 is included.
- the semiconductor chip 106 is electrically connected to the leads 104 aligned near the outer periphery of the mold resin 116 via the bonding pads 108 aligned on the one main surface 106 a and the bonding wires 114.
- the semiconductor chip 106 in addition to the effects of the semiconductor device 150 shown in FIG. 2 and FIG. 3, even when the semiconductor chip 106 is inclined, contact between the semiconductor chip 106 and the island 102 can be prevented. Insulation between the chip 106 and the island 102 can be ensured. Further, compared to FIG. 3, the bonding area of the second insulating material 112 and the island 102 can be increased. As a result, the semiconductor chip 106 is firmly fixed on the island 102, and wire bonding with higher accuracy is possible. Note that since the first insulating material 126 is divided into a plurality of small pieces, a plurality of air gaps are formed. For this reason, even if a void is generated in the second insulating material 112, the void can be confined in the void.
- FIG. 9 is another modified example of the semiconductor device 350 shown in FIG.
- the same parts as those in the configuration shown in FIG. 8 are assigned the same reference numerals and detailed explanations thereof will be omitted.
- the semiconductor device 400 differs from the configuration shown in FIG. 8 in that the first insulating material 128 is formed on the island 102 opposed to the vicinity of the vertex in the other main surface 106 b of the semiconductor chip 106.
- the vicinity of the vertex includes the vertex and is a range in which the distance from the vertex does not exceed the length of a quarter of one side of the other major surface 106 b.
- the semiconductor device 400 includes the island 102, the lead 104, the semiconductor chip 106, the bonding pad 108, the first insulating material 128, the second insulating material 112, the bonding wire 114, and the molding resin 116.
- the effects of the semiconductor device 350 shown in FIG. 8 can be obtained. Further, when the semiconductor chip 106 is inclined by the first insulating material 128 being fixed on the island 102 facing the outer periphery of the other main surface 106 b of the semiconductor chip 106, the semiconductor chip 106 and the island 102 are It can prevent contact with Therefore, even when the semiconductor chip 106 is inclined at the time of die bonding, the insulation between the semiconductor chip 106 and the island 102 can be appropriately secured.
- the semiconductor device in which the first insulating material is divided into plural pieces on the island 102 and fixed in order to increase the bonding area between the second insulating material 112 and the island 102.
- the first insulating material does not necessarily have to be divided into a plurality of small pieces, and for example, as shown in FIGS. 10 and 11, the second insulating material 112 is provided by providing the holes 132 reaching the island 102 in the first insulating material 130. It is also possible to increase the adhesion area between the and the islands 102.
- FIG. 10 shows another modified example of the semiconductor device 350 shown in FIG.
- the semiconductor device 450 differs from the configuration shown in FIG. 7 in that the first insulating material 130 is provided with holes 132 reaching the island 102 instead of dividing the first insulating material 130 into a plurality of small pieces. Also in the case where the holes 132 are provided in the first insulating material 130, the same effect as in the case of dividing them into a plurality of small pieces can be obtained.
- the semiconductor device 450 includes the island 102, the leads 104a and 104b, the semiconductor chip 106, the bonding pads 108a and 108b, the first insulating material 130, the hole 132 provided in the first insulating material 130, the second insulating material 112, Bonding wires 114 a and 114 b and a mold resin 116 are provided.
- FIG. 11 is a plan view of the semiconductor device 450 shown in FIG.
- the same parts as those in FIG. 10 are assigned the same reference numerals and detailed explanations thereof will be omitted.
- the mold resin 116 is transparent, and the outer periphery of the mold resin 116 is indicated by a frame (dotted line) 116 a.
- the semiconductor device 450 includes an island 102, a plurality of leads 104, a semiconductor chip 106, a plurality of bonding pads 108, a first insulating material 130, a hole 132, a second insulating material 112, a plurality of bonding wires 114, and a molding resin 116. .
- the leads 104 a and 104 b shown in FIG. 10 are included in the plurality of leads 104.
- the second insulating material 112 passes through the holes 132 provided in the first insulating material 130 and adheres to the island 102. For this reason, the adhesion area of the 2nd insulating material 112 and the island 102 becomes wide. Therefore, the semiconductor chip 106 is firmly fixed on the island 102, and wire bonding with higher accuracy is possible. Further, a plurality of holes 132 may be provided in the semiconductor device 450 shown in FIG.
- FIG. 12 shows a semiconductor device according to the fourth embodiment of the present invention.
- the first insulating material 138 is fixed on the island 102.
- the third insulating material 140 is fixed to the other main surface 106 b of the semiconductor chip 106.
- the semiconductor chip 106 and the island 102 are fixed by the second insulating material 142.
- Semiconductor device 600 differs from the configuration shown in FIG. 1 in these points. The same parts as in FIG. 1 are assigned the same reference numerals and detailed explanations thereof will be omitted.
- the semiconductor device 600 includes the island 102, the leads 104a and 104b, the semiconductor chip 106, the bonding pads 108a and 108b, the first insulating material 138, the second insulating material 142, the third insulating material 140, the bonding wires 114a and 114b, The mold resin 116 is provided.
- the semiconductor chip 106 is fixed on the island 102 by the first insulating material 138, the second insulating material 142, and the third insulating material 140.
- the first insulating material 138 and the second insulating material 142 are the same as the first insulating material 118 and the second insulating material 112 in the second embodiment shown in FIG. And the characteristics are similar.
- the third insulating material 140 is the same in material and characteristics as the first insulating material 110 in the first embodiment shown in FIG.
- the semiconductor chip 106 is fixed on the island 102 via the first insulating material 138, the second insulating material 142, and the third insulating material 140, so that the semiconductor shown in FIG.
- the semiconductor chip 106 and the island 102 can be isolated with higher withstand voltage.
- the semiconductor device 650 differs from the configuration shown in FIG. 12 in that the third insulating material 140 is not provided, and the configurations of the second insulating material 152 and the leads 105 are different.
- the same parts as in FIG. 12 are assigned the same reference numerals and detailed explanations thereof will be omitted.
- the semiconductor device 650 includes an island 102, a plurality of leads 105, a semiconductor chip 106, a plurality of bonding pads 108, a first insulating material 138, a second insulating material 152, a plurality of bonding wires 114, and a molding resin 116.
- the leads 105a and 105b shown in FIG. 13 are included in the plurality of leads 105, the bonding pads 108a and 108b are included in the plurality of bonding pads 108, and the bonding wires 114a and 114b are a plurality of bondings. It is included in the wire 114.
- the first insulating material 138 has a planar size larger than that of the semiconductor chip 106. As clearly shown in FIG. 14, the four sides of the first insulating material 138 are disposed outside the four sides of the semiconductor chip 106.
- the second insulating material 152 is made of the same material as the second insulating material 142 shown in FIG. In the present embodiment, the second insulating material 152 covers approximately the lower half of the side surface 106 g of the semiconductor chip 106.
- the number of bonding pads 108 and leads 105 is much more than that of the configuration shown in FIGS. 3 to 6, 8, 9, and 11. .
- the plurality of leads 105 are arranged along the four sides of the mold resin 116 to near the two ends of each side.
- FIG. 15 shows the lead 105 in an enlarged manner.
- the lead 105 has a semi-elliptical portion 105 c and a slant portion 105 d.
- the semi-elliptical portion 105 c penetrates from the position where the bonding wire 114 is bonded to the back surface of the mold resin 116.
- the oblique portion 105 d extends in a direction parallel to the bonding wire 114 joined in plan view.
- the oblique portion 105 d is formed in about half of the area from the position where the bonding wire 114 is bonded to the back surface of the mold resin 116. Therefore, when the semiconductor device 650 is observed from the back surface, only the semi-elliptic portion 105 c is visually recognized, and the oblique portion 105 d is hidden.
- the semiconductor chip 106 can be suitably prevented from coming in contact with the island 102.
- the bonding wire 114 in an attitude inclined with respect to the four sides of the semiconductor chip 106 and the mold resin 116 can be appropriately bonded.
- the inclination of the bonding wire 114 tends to increase as the number of bonding pads 108 and leads 105 increases. Therefore, when the number of bonding pads 108 and the plurality of leads 105 is relatively large, the configuration of the semiconductor device 650 is effective.
- a more specific configuration of the semiconductor chip 106 used for the semiconductor device 650 will be described below with reference to FIGS. 16 to 19.
- the semiconductor chip 106 used for the semiconductor devices 100, 150, 200, 250, 300, 350, 400, 450, and 600 may be described here.
- the plurality of bonding pads 108 provided on the semiconductor chip 106 function as a plurality of terminals shown in FIG. Specifically, terminals VIN and GND are provided on the input side, and terminals AVDD, VON, VOFF, VSS, HAVDD and VDD are provided on the output side.
- terminals VIN and GND are provided on the input side
- terminals AVDD, VON, VOFF, VSS, HAVDD and VDD are provided on the output side.
- the potential of the terminal GND is set to 0 V
- the potential of the terminal VIN is set to 12 V.
- Each terminal on the output side is designed such that its potential is a predetermined magnitude relative to the potential of the terminal GND.
- the potential of the terminal VOFF is ⁇ 10 V and the potential of the terminal VSS is ⁇ 7.5 V.
- the terminal AVDD is 15 V
- the terminal VON is 28 V
- the terminal HAVDD is 7.5 V
- the terminal VDD is 3.3 V.
- the semiconductor chip 106 achieves the function of generating the potential of the terminal on the output side so as to be a negative voltage with respect to the potential of the terminal GND which is the reference potential, in a so-called one chip.
- the semiconductor device 650 can also be used as a system power supply for controlling a power supply necessary for the liquid crystal display panel. Such power supplies have multiple positive voltages and multiple negative voltages. Note that the positive voltage can be generated by a charge pump method or a regulator method (such as a switching regulator or a series regulator).
- capacitors C1 and C2 and switches SW1, SW2, SW3 and SW4 are disposed between the terminal VIN on the input side and the terminal VOFF on the output side, with the capacitor C1 interposed therebetween.
- Contacts N1 and N2 are provided.
- the switches SW1 and SW3 are closed and the switches SW2 and SW4 are open.
- the potential of the contact N1 is higher than the potential of the contact N2 by the potential of the terminal VIN. That is, a potential difference between the terminal GND and the terminal VIN is applied to the capacitor C1.
- the capacitor C1 is charged by the potential difference between the terminal GND and the terminal VIN.
- the switches SW1 and SW3 are opened and the switches SW2 and SW4 are closed.
- the potential of the contact N1 is set to 0 V similar to the terminal GND. Since the voltage applied to the capacitor C1 is maintained, the potential of the contact N2 is lower than the potential of the terminal GND by the potential of the terminal VIN. Therefore, the potential of the terminal VOFF is set to a negative potential whose absolute value is the same as that of the terminal VIN with respect to the potential of the terminal GND.
- an n-type region 162 is formed on a p-type substrate 161.
- FIG. 19 shows the PNP transistor structure in the semiconductor chip 106 as an example.
- Two p-type regions 163 are formed so as to sandwich the n-type region 162.
- a p-type region 164 is formed on the opposite side of the n-type region 162 from the p-type substrate 161.
- An n-type region 165 is formed so as to be surrounded by the p-type region 164.
- a terminal connected to the n-type region 162 functions as a so-called collector
- a terminal connected to the p-type region 164 functions as a so-called base
- a terminal connected to the n-type region 165 functions as a so-called emitter.
- pn junctions that occur between p-type semiconductors and n-type semiconductors are formed everywhere, and this pn junction can constitute a parasitic element. If the potential of the terminal VOFF leading to the p-type substrate 161 is not set to the lowest potential, the above-described parasitic element operates unreasonably.
- a semiconductor device 650 capable of enhancing the insulation performance between the semiconductor chip 106 and the island 102 is preferable.
- FIG. 20 shows a modification of the semiconductor device 650 shown in FIGS.
- the same parts as those shown in FIGS. 13 to 15 are denoted by the same reference numerals, and the detailed description will be omitted.
- the semiconductor device 700 of the present modification includes four suspension leads 105 e and a plating layer 119.
- the four suspension leads 105 e are connected to the four corners of the island 102 and extend toward the four corners of the mold resin 116.
- the plated layer 119 is made of, for example, Ag, and includes four suspension leads 119a, an outer edge 119b, and a plurality of leads 119c.
- Each suspension lead portion 119a is formed in the suspension lead 105e, and covers the suspension lead 105e over the entire length.
- the outer edge portion 119 b is formed in a region surrounding a region of the island 102 in contact with the second insulating material 152.
- the outer edge portion 119 b is in contact with the outer edge of the island 102, and the outer edge portion 119 b in this modification is in contact with the entire outer edge of the island 102.
- the outer edge portion 119 b has a rectangular frame shape.
- Each lead portion 119 c is formed in each lead 105.
- Each lead portion 119c is formed in a portion near the oblique portion 105d and a oblique portion 105d in the semi-elliptic portion 105c shown in FIG.
- the bonding wire 114 is connected to the lead 105 through the lead portion 119c.
- a relatively clear contrast is produced by the exposed portion of the island 102 itself and the plating layer 119. Therefore, when manufacturing the semiconductor device 700, there is an advantage that it is easy to recognize the position and shape of the island 102 and the plurality of leads 105 in the image recognition process for mounting the semiconductor chip 106 and forming the bonding wire 114. .
- the plating layer 119 with Ag, the contrast with the island 102 and the leads 105 made of Cu-Fe-P which is a Cu-based material, Fe 58% Ni 42% alloy which is an Fe-based material, etc. is enhanced. An effect can be expected.
- FIG. 21 shows another modified example of the semiconductor device 650 shown in FIGS.
- the same parts as those shown in FIGS. 13 to 15 and 20 are denoted by the same reference numerals, and the detailed description will be omitted.
- the configuration of the outer edge portion 119 b of the plating layer 119 is different from that of the semiconductor device 700 described above.
- the outer edge 119 b is formed of four elements formed at the four corners of the island 102.
- the outer edge 119 b of such a configuration can be expressed as having spaced apart portions between the corners of the island 102.
- FIG. 22 shows another modification of the semiconductor device 650 shown in FIGS.
- the same parts as those shown in FIGS. 13 to 15 and FIGS. 20 and 21 are designated by the same reference numerals, and the detailed description will be omitted.
- the plating layer 119 includes only the four suspension lead portions 119a and the plurality of lead portions 119c. Even in such a modification, a relatively clear contrast is produced by the exposed portion of the island 102 itself and the plating layer 119. Therefore, when manufacturing the semiconductor device 800, in the image recognition process for mounting the semiconductor chip 106 and forming the bonding wires 114, there is an advantage that the positions and shapes of the islands 102 and the plurality of leads 105 can be easily recognized. .
- the first insulating material and the second insulating material may be configured by mixing two or more materials.
- Elastic modulus and volume resistivity can be flexibly adjusted by mixing two or more materials.
- the semiconductor chip is fixed on the island by the first insulating material and the second insulating material.
- the semiconductor chip is firmly fixed on the island by the second insulating material having a higher dielectric breakdown voltage between the semiconductor chip and the island due to the cooperation of the insulating material and the elastic modulus higher than that of the first insulating material. It is possible to reduce product defects and the like that occur at the time of bonding.
- the semiconductor chip and the island are isolated by a high dielectric breakdown voltage, minute leak current to the external substrate can be prevented even in a QFN package or the like in which the island is exposed to the outside. The possibility is high.
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Abstract
Description
成されている。
上記第1の絶縁材料は、上記他主面における対向する2辺から越えないように上記アイランド上に固着されている。
図1に本発明の第1の実施形態にかかる半導体装置を示す。半導体装置100はアイランド102、リード104a,104b、半導体チップ106、ボンディングパッド108a、108b、第1の絶縁材料110、第2の絶縁材料112、ボンディングワイヤ114a、114b、モールド樹脂116を備える。
性率が1000MPa以上5000MPa以下であることが望ましい。第1の絶縁材料110の弾性率は、絶縁材料の乾燥温度や乾燥時間等を調整することで行うことができる。さらに、半導体チップ106とアイランド102との間の絶縁耐圧を確保するために、第1の絶縁材料110は、1000GΩ・cm以上の体積抵抗率を有することが望ましい。
半導体チップ106のダイボンディングおよびボンディングワイヤ114a、114bのワイヤボンディング後、半導体チップ106を湿度や温度、機械的圧力等の外部ストレスから保護するために、モールド樹脂116によって半導体チップ106に樹脂封止が施される。モールド樹脂116としては、エポキシ系樹脂、フェノール系樹脂、不飽和ポリエステル系樹脂、ポリウレタン系樹脂、シリコン系樹脂、ポリイミド系樹脂等、種々の材料を用いることができる。ただし、モールド樹脂116と第2の絶縁材料112の熱膨張率はほぼ同じ大きさとなることが望ましい。たとえば、第2の絶縁材料112としてポリイミド系樹脂を用いた場合、モールド樹脂116にもポリイミド系樹脂を用いることが望ましい。
図2に、本発明の第2の実施形態にかかる半導体装置を示す。図1に示す構成と同じ個所には同一の符号を付し、詳しい説明は省略する。半導体装置150は、第1の絶縁材料118を半導体チップ106側に固着するのではなく、アイランド102上に固着させた点において図1と異なる。
図7に、本発明の第3の実施形態にかかる半導体装置を示す。半導体装置350は、第1の絶縁材料126がアイランド102上に離散配置された複数の小片に分割されている点が、図2に示した構成と異なる。図2と同じ個所には同一の符号を付し、詳しい説明は省略する。
図12に本発明の第4の実施形態にかかる半導体装置を示す。半導体装置600においては、第1の絶縁材料138がアイランド102上に固着されている。また、半導体チップ106の他主面106bに第3の絶縁材料140が固着されている。さらに、第2の絶縁材料142によって、半導体チップ106とアイランド102が固着されている。半導体装置600は、これらの点において、図1に示された構成と異なる。図1と同じ個所には同一の符号を付し、詳しい説明は省略する。
図13および図14に、本発明の第5の実施形態にかかる半導体装置を示す。半導体装置650は、第3の絶縁材料140を備えない点と、第2の絶縁材料152およびリード105の構成が、図12に示した構成と異なる。図12と同じ個所には同一の符号を付し、詳しい説明は省略する。
Claims (31)
- アイランドと、
第1の絶縁材料と、
上記第1の絶縁材料よりも弾性率の高い第2の絶縁材料と、
ボンディングパッドが形成された一主面、および上記一主面と反対側を向いており、かつ上記第1の絶縁材料および上記第2の絶縁材料を介して上記アイランド上に固着された他主面を有する半導体チップと、を備え、
上記第2の絶縁材料は上記アイランドと上記半導体チップとの双方に接している、半導体装置。 - 上記第1の絶縁材料は上記アイランド上に形成され、
上記第2の絶縁材料は、
上記他主面、上記一主面および上記他主面の双方につながる側面、上記第1の絶縁材料、ならびに上記アイランドと接して固着されている、請求項1に記載の半導体装置。 - 上記第1の絶縁材料は、上記他主面外周のすべてを越えている、請求項2に記載の半導体装置。
- 上記第1の絶縁材料は、上記第2の絶縁材料によって覆われている、請求項1に記載の半導体装置。
- 上記第2の絶縁材料は、絶縁ペーストである、請求項1に記載の半導体装置。
- 上記第2の絶縁材料の弾性率は、3000MPa以上、10000MPa以下である、請求項1に記載の半導体装置。
- 上記第1の絶縁材料の弾性率は、1000MPa以上、5000MPa以下である、請求項1に記載の半導体装置。
- 上記アイランドの一部は、半導体装置の外部に露出している、請求項1に記載の半導体装置。
- 上記アイランドは、吊りリードで支持されている、請求項1に記載の半導体装置。
- 上記半導体装置はさらに、上記他主面に固着された第3の絶縁材料を備える、請求項1に記載の半導体装置。
- 上記第1の絶縁材料の体積抵抗率は、1000GΩ・cm以上である、請求項1に記載の半導体装置。
- 上記第1の絶縁材料は、上記他主面外周を越えないように上記アイランド上に固着されている、請求項1に記載の半導体装置。
- 上記他主面は、4辺形を呈し、
上記第1の絶縁材料は、上記他主面における対向する2辺から越えないように上記アイランド上に固着されている、請求項1に記載の半導体装置。 - 上記第1の絶縁材料は、上記他主面中心部と対向する上記アイランド上にて交差する十字型をなしており、かつ上記アイランドに固着されている、請求項1に記載の半導体装置。
- 上記第1の絶縁材料は、上記アイランド上における上記他主面と対向する領域に離散配置された複数の小片に分割されている、請求項1に記載の半導体装置。
- 上記第1の絶縁材料は、上記アイランドまで達する貫通孔を有する、請求項1に記載の半導体装置。
- 上記第1の絶縁材料は、上記他主面を覆っており、
上記第2の絶縁材料は、上記一主面および上記他主面につながる側面、上記第1の絶縁材料、および上記アイランドと接して固着されている、請求項1に記載の半導体装置。 - 上記第1の絶縁材料は、上記第2の絶縁材料によって覆われている、請求項17に記載の半導体装置。
- 上記第2の絶縁材料の弾性率は、3000MPa以上、10000MPa以下である、請求項17に記載の半導体装置。
- 上記第2の絶縁材料は、絶縁ペーストである、請求項17に記載の半導体装置。
- 上記アイランドのうち上記第2の絶縁材料が接する領域を囲む領域に形成され、かつ上記アイランドの外縁の少なくとも一部に達する外縁部を含むメッキ層をさらに備える、請求項1に記載の半導体装置。
- 上記外縁部は、上記アイランドの上記外縁のすべてに達する枠状である、請求項21に記載の半導体装置。
- 上記アイランドは、矩形状であり、
上記外縁部は、上記アイランドの四隅に接し、かつ各隅どうしのあいだに離間した部分を有する、請求項21に記載の半導体装置。 - 上記アイランドを支持する吊りリードをさらに備えており、
上記メッキ層は、上記吊りリードに形成された吊りリード部をさらに含む、請求項21に記載の半導体装置。 - 複数のリード、およびこれらのリードと上記半導体チップとを接続する複数のボンディングワイヤをさらに備えており、
上記メッキ層は、上記リードのうち上記ボンディングワイヤが接合された部分を含む領域に形成されたリード部をさらに含む、請求項21に記載の半導体装置。 - 上記メッキ層は、Agからなる、請求項21に記載の半導体装置。
- 上記半導体チップに導通する入力リード、出力リード、およびグランドリードをさらに備えており、
上記半導体チップは、上記グランドリードにグランド電位に接続され、上記入力リードに正電圧が印加された状態で、上記出力リードを上記グランド電位に対して負電位に設定しうる、請求項1に記載の半導体装置。 - 基準電位に対する負電圧を生成する負電圧生成回路を備える、請求項1に記載の半導体装置。
- 上記基準電圧に対して複数の正電圧を生成するシステム電源として構成されている、請求項29に記載の半導体装置。
- 半導体ウェハの一主面に素子およびボンディングパッドを形成する工程、
上記半導体ウェハの上記一主面と反対側を向く他主面に第1の絶縁材料を固着する工程、
上記半導体ウェハを個々の半導体チップにダイシングする工程、
上記半導体チップを第2の絶縁材料を介してリードフレームのアイランド上に固着する工程、
上記ボンディングパッドと上記リードフレームのインナーリードとをワイヤボンディングする工程、
上記半導体チップおよび上記リードフレームをモールディングする工程、を備える、半導体装置の製造方法。 - 上記第1の絶縁材料は、スピンコートによって上記半導体ウェハの他主面にコーティングされる、請求項30に記載の半導体装置の製造方法。
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Also Published As
Publication number | Publication date |
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US20140284782A1 (en) | 2014-09-25 |
US20120286412A1 (en) | 2012-11-15 |
US8779569B2 (en) | 2014-07-15 |
TWI447825B (zh) | 2014-08-01 |
US9859194B2 (en) | 2018-01-02 |
JPWO2011087119A1 (ja) | 2013-05-20 |
US9142494B2 (en) | 2015-09-22 |
US20150348880A1 (en) | 2015-12-03 |
US9406591B2 (en) | 2016-08-02 |
US20160322285A1 (en) | 2016-11-03 |
TW201145415A (en) | 2011-12-16 |
CN102714164A (zh) | 2012-10-03 |
CN102714164B (zh) | 2015-04-01 |
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