EP2766922A1 - Leistungshalbleiterchip mit metallischen formkörpern zum kontaktieren mit dickdrähten oder bändchen sowie verfahren zu dessen herstellung - Google Patents
Leistungshalbleiterchip mit metallischen formkörpern zum kontaktieren mit dickdrähten oder bändchen sowie verfahren zu dessen herstellungInfo
- Publication number
- EP2766922A1 EP2766922A1 EP12769904.9A EP12769904A EP2766922A1 EP 2766922 A1 EP2766922 A1 EP 2766922A1 EP 12769904 A EP12769904 A EP 12769904A EP 2766922 A1 EP2766922 A1 EP 2766922A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- power semiconductor
- semiconductor chip
- shaped body
- potential
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- 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
- H01L23/492—Bases or plates or solder therefor
- H01L23/4924—Bases or plates or solder therefor characterised by the materials
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- H01L2224/85001—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector involving a temporary auxiliary member not forming part of the bonding apparatus, e.g. removable or sacrificial coating, film or substrate
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- H01L24/42—Wire connectors; Manufacturing methods related thereto
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- H01L2924/10251—Elemental semiconductors, i.e. Group IV
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- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
Definitions
- the invention relates to a power semiconductor chip having at least one upper-side potential surface.
- Power modules typically consist of several semiconductors, many of which, e.g. Diodes are flowed perpendicular to the chip surface of the load current.
- the underside of the semiconductor is contacted with a solder joint or partially also with a sintered or diffusion-brazed joint.
- the top of the semiconductor has a metallization or metal layer optimized for the bonding process of thick A-aluminum wires.
- a metallization or metal layer optimized for the bonding process of thick A-aluminum wires.
- the semiconductors are becoming thinner and thinner to reduce electrical losses.
- power semiconductors are on the market with only about 70 ⁇ total thickness.
- Research institutes have already been able to submit the first extreme wafer densities down to 1 ⁇ .
- a major influence on the limitation of the service life of a power module is the chip-side chip contacting.
- a very robust sintered connection on the underside of a chip only leads to a small increase in module lifetime, since the failure of the aluminum wires on the top of the semiconductor is the limiting factor.
- Al bonding technology has been established in power electronics production lines for many years. Continuous optimization of the bonding process has increased the expected lifetime of this compound. However, this high level is approximately at the physical limit of the load capacity of an aluminum weld joint, so that large life-expectancy steps can only be realized by new concepts in packaging and assembly (AVT). This need is also reinforced by the fact that the sintering technology on the bottom side of the semiconductor already shows a double-digit increase in lifetime expectancy (relative to soldering technology).
- the invention now seeks to improve the life of a power module, in particular of the power semiconductor chip, by improving the contacts on the top potential surface (s). At the same time, the yield is to be increased by a more stable and less fractured training.
- the thin layers or shaped bodies form a mechanical protection of the surfaces, in particular over the potential surfaces, for example in force-fitting contacting test methods (high-current tests at the wafer level).
- This enables reliable electrical testing of the semiconductors before the top-side contacting of the semiconductor has been realized.
- the surface of the metallic layer which is materially bonded to the semiconductor, is contacted with special spring tools, without the risk of destroying the fine surface structures of the semiconductor.
- FIG. 1 is a schematic perspective overall and a detailed view of a power semiconductor chip with upper contacting according to the invention
- Fig. 2 is a plan view of the molded body held on a carrier layer
- Fig; 3 is a schematic view along a section in the line from a to a in FIG. 2.
- the power semiconductor chip 10 according to the invention with top potential surfaces preferably has at least one electrically conductive shaped body 24, 25 covering a potential surface.
- the shaped body 24 is shown as a layer layer surrounding a further shaped body 25, below which a plurality of potential areas may lie, which may then be joined to the layer, for example four in the corner areas, or even two opposite ones, as it is the sectional view indicates. Also, the case that even the potential surface of the power semiconductor chip 10 almost has the annular shape of the layer is not excluded.
- the power semiconductor chip 10 has potential surfaces on the upper side, onto which the molded bodies are preferably provided with good electrical and thermal conductivity (consisting of Cu, Ag, Au, Al, Mo, W and their alloys).
- the moldings will be about 30 ⁇ to 300 ⁇ strong. Both thin semiconductors in the range of 30 ⁇ moldings between 30 ⁇ and 40 ⁇ , as well as for thicker semiconductor chips of 150 ⁇ - 200 ⁇ correspondingly slightly thicker shaped body between ⁇ and 150 ⁇ thickness in question; Such a shaped body is fastened by means of a bonding layer 1 in low-temperature sintering technology (or diffusion-soldered or glued) on the metallization layer 10b of the semiconductor. The shaped body does not project beyond the dimensions of the power semiconductor chip 10.
- a further shaped body 30 can be fastened on the underside of the power semiconductor chip 10. It has the same layer thickness as the molded body 24, 25 on the upper side of the power semiconductor chip 10.
- the connection 2 between the lower molded body 30 and the power semiconductor chip 10 corresponds to the connection technology between the chip and the molded body 24, 25 at the top.
- each potential surface of the semiconductor e.g., emitter and gate
- each potential surface of the semiconductor is electrically contacted with the lower surface of the molded body via a connection.
- an electrical potential of the semiconductor has multiple areas (e.g., so-called gate finger segmented emitter areas), then it is an option to provide a corresponding number of individual moldings.
- the shaped body can also partially form individual islands 25 (variants 1 and 2), it is advantageous to use a carrier material 20a which ensures the cohesion of the wafer during assembly.
- This support material could be a temperature-resistant plastic, for example polyamide or polyimide, which withstands both high temperatures and, as an insulator, prevents a flow of current between the different potential surfaces 24, 25.
- the individual shaped bodies on the potential surfaces 24, 25 consist for example of a thin copper sheet (30-300 ⁇ ), which is coated on the side assigned to the chip with an oxidation-inhibiting protective layer 23 (Ag or Au).
- the carrier material 20a and the shaped bodies 24, 25 form a common carrier foil with structured fins, ie, for example, the annular fins obtained by etching as in FIG. 2.
- the upper side of the carrier film 20a can also have a plurality of mold body surfaces which simultaneously cover the potential which is the same on the upper side of the potential surfaces, or moldings which simultaneously cover the same . reflect the electrical contact surfaces 11, 12 of the semiconductor, and which are tightly sintered on them.
- These shaped bodies are preferably electrically contacted by metallic conductors in the form of wires, strips, wire bundles, braid or fabric strips 50 on the upper side of the individual shaped bodies 24, 25.
- metallic conductors in the form of wires, strips, wire bundles, braid or fabric strips 50 on the upper side of the individual shaped bodies 24, 25.
- a preferred embodiment is copper thick wire bonding (eg up to 600 ⁇ m in diameter).
- FIG. 3 it can be seen how metallic shaped bodies 24, 25 are arranged above the chip potential areas 11, 12, 13. Also underneath the chip 10, a shaped body with a carrier foil with the side facing the chip can be connected over the whole area to the underside of the semiconductor.
- the surface of the platelet may have an oxidation-protective layer. With the aid of the sintering or diffusion soldering technique, a cohesive connection with the metallization layer 10c on the underside of the semiconductor is ultimately realized.
- the shaped body can have a layer thickness on the underside of the semiconductor, which generates a balanced mechanical stress in combination with the shaped bodies on the chip top side. This means that after the addition of lower-side plate and upper-side molded body, a very small resulting deformation of the semiconductor is produced.
- a preferred solution is to make both layers the same thickness and of the same material. This consists either of pure copper, which projects all the way to the chip edges, or of a large framed copper island, which has a very narrow (a few ⁇ ) polyamide film circumferentially, as can be seen in Fig. 2.
- the top-side contact foil can contact all semiconductor elements of an unsealed wafer composite in multiple juxtaposition. As a result, a particularly low-tolerance coverage of all the conductor surfaces of the contact foil with the potential surfaces of the semiconductor is achieved. This results in a more cost-effective parallel processing compared to the serial assembly of a respective semiconductor element and a single contact foil. After the connection of the wafer-contact foil to the semiconductor wafer by low-temperature sintering, soldering or gluing is a conventional separation z. B. possible by sawing.
- the advantages of using the power semiconductor chips having at least one upper-side potential surface and contacting thick wires or tapes, with a connection layer on the potential surfaces, and at least one metallic molded body on the connection layer (s), the lower flat side facing the potential surface, and a connection method The compound layer according to coated is formed, and the material composition and thickness of which is selected in accordance with the order of the related thick wires or ribbons on the molding top in the order are the following:
- the moldings allow a top-side contacting by thick copper wires for thin semiconductor elements.
- the moldings protect the sensitive thinly metallized surfaces of the semiconductors (typically only about 3-4 ⁇ m) in copper thick-wire bonding.
- the shaped bodies ensure a better current density distribution over the entire cross section of the chip surface.
- the moldings protect the sensitive surface structure of the semiconductor during frictional contact by resilient contacts. This facilitates the non-destructive, electrical quality inspection in the production lines.
- a bottom foil and molded body layer prevents the bowl effect (deformation of the semiconductor element) by symmetrizing the mechanical stresses.
- Top and bottom carrier foils carry shaped body fields which can cover a whole wafer and thus enable cost-effective and precise parallel occupation of all contact surfaces with moldings.
- FIG. 1 shows the power semiconductor chip 10 according to the invention, with top potential surfaces 11, 12, 13 (see FIG. 3) of only two potential surfaces 11, 13; 12 covering moldings 24, 25 are electrically and cohesively contacted by a bonding layer 1.
- the potential surfaces 11 and 13 have the same potential and can therefore be contacted together with an electrically conductive, circumferential guide surface of the shaped body 24, as can be seen approximately square in FIG. 2 with a central recess. Further surfaces to be contacted are possible with a shaping as in FIG. 2 under the entire upper-side extent of the shaped body. They would then be added after applying a compound layer 1 then also the Forrn Sciences 24.
- a separate mold body 25 is provided on a potential surface 12 of a different potential, for example a gate. Both mold bodies 24, 25 are held on a contact foil 20a, which has passages on the underside in the region of the moldings 24, 25.
- the molded body or bodies 24, 25 are provided with good electrical and thermal conductivity of metal, for example, the molded body 24, 25 comprises a material of the group Cu, Ag, Au, Al, Mo, W or their alloys, the alloys comprising one or more Metals of the aforementioned group may have.
- the shaped body 24, 25 will have between 15 ⁇ and 500 ⁇ thickness, preferably 30 ⁇ and 300 ⁇ m. Again advantageous between 75 ⁇ and 150 ⁇ m thickness.
- thin semiconductors in the range of 30 ⁇
- moldings between 30 and 40 ⁇ , as well as for thicker semiconductor chips of 150 ⁇ - 200 ⁇ correspondingly thicker shaped body between ⁇ and 150 ⁇ thickness in question.
- the molded body can fulfill its stabilizing function.
- molded body thicknesses of one quarter to one half of the wire diameter are proposed.
- the additional molded body 30 provided on the lower side of the power semiconductor chip 10 next to the upper-side molded body 24, 25 is attached to the power semiconductor chip 10 as well as the upper one by low-temperature sintering technology, diffusion soldering or gluing.
- connection to be joined has, under each shaped body 24, 25, a smaller projection area than the shaped body 24, 25, leaving an edge of the shaped body which is fixed on an organic non-conductive carrier foil 20a, which in turn rests on the power semiconductor chip 10 can be fixed after accurate application.
- the carrier film 20a can cover the regions of the chip surface which are not to be joined. It should not extend beyond the outer boundary of the chip.
- the connecting layer 1 of sintered material in the dimensions is selected to be slightly smaller than both shaped body as potential surface, and still carrier film 20a over the edges of the potential surfaces 3787
- thermal expansion properties of an upper-side molded article 24, 25 can be compensated for by selecting a dissimilar material and a different thickness for another molded article 30 on the underside of the power semiconductor chip 10 to achieve low resulting total strain.
- the molding should not reach the edge of the power semiconductor chip 10. This would require elaborate isolation.
- a proposed method for applying moldings to a power semiconductor chip uses an electrically insulating, the thermal stress during bonding resisting carrier sheet 20a with a number of moldings 24, 25. These are applied simultaneously to the power semiconductor chip before joining, as well as a number of moldings 24, 25 for a plurality of power semiconductor chips 10 for low-tolerance coverage of the top and - with a further carrier sheet, or an electrically conductive film - can also find the bottom use.
- bonding layer NTV or diffusion soldering
- bonding layer NTV or diffused soldering
- bonding layer NTV or diffused soldering
- first copper conductive surface e.g., emitter
- second copper face e.g., gate
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Textile Engineering (AREA)
- Die Bonding (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
- Wire Bonding (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102011115887A DE102011115887A1 (de) | 2011-10-15 | 2011-10-15 | Leistungshalbleiterchip mit oberseitigen Potentialflächen |
PCT/EP2012/003787 WO2013053420A1 (de) | 2011-10-15 | 2012-09-10 | Leistungshalbleiterchip mit metallischen formkörpern zum kontaktieren mit dickdrähten oder bändchen sowie verfahren zu dessen herstellung |
Publications (1)
Publication Number | Publication Date |
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EP2766922A1 true EP2766922A1 (de) | 2014-08-20 |
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US (2) | US9318421B2 (de) |
EP (1) | EP2766922A1 (de) |
JP (1) | JP5837697B2 (de) |
CN (1) | CN103890924B (de) |
DE (1) | DE102011115887A1 (de) |
WO (1) | WO2013053420A1 (de) |
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DE102016108656A1 (de) | 2016-05-11 | 2017-11-16 | Danfoss Silicon Power Gmbh | Leistungselektronische Baugruppe mit vibrationsfreier Kontaktierung |
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DE102011115886B4 (de) | 2011-10-15 | 2020-06-18 | Danfoss Silicon Power Gmbh | Verfahren zur Schaffung einer Verbindung eines Leistungshalbleiterchips mit oberseitigen Potentialflächen zu Dickdrähten |
DE102014221687B4 (de) | 2014-10-24 | 2019-07-04 | Danfoss Silicon Power Gmbh | Leistungshalbleitermodul mit kurzschluss-ausfallmodus |
DE102014222818B4 (de) | 2014-11-07 | 2019-01-03 | Danfoss Silicon Power Gmbh | Elektronik-Sandwichstruktur mit zwei mittels einer Sinterschicht zusammengesinterten Fügepartnern |
DE102014222819B4 (de) | 2014-11-07 | 2019-01-03 | Danfoss Silicon Power Gmbh | Leistungshalbleiterkontaktstruktur mit Bondbuffer sowie Verfahren zu dessen Herstellung |
DE102015109856A1 (de) * | 2015-06-19 | 2016-12-22 | Danfoss Silicon Power Gmbh | Verfahren zum Herstellen einer für die Anbindung eines elektrischen Leiters geeigneten metallischen Kontaktfläche zur Kontaktierung eines Leistungshalbleiters, Leistungshalbleiter, Bond Buffer und Verfahren zur Herstellung eines Leistungshalbleiters |
DE102015113421B4 (de) | 2015-08-14 | 2019-02-21 | Danfoss Silicon Power Gmbh | Verfahren zum Herstellen von Halbleiterchips |
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JP7404208B2 (ja) | 2020-09-24 | 2023-12-25 | 株式会社東芝 | 半導体装置 |
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JP4420001B2 (ja) * | 2006-09-11 | 2010-02-24 | 株式会社日立製作所 | パワー半導体モジュール |
JP5090088B2 (ja) * | 2007-07-05 | 2012-12-05 | ルネサスエレクトロニクス株式会社 | 半導体装置およびその製造方法 |
US9583413B2 (en) * | 2009-02-13 | 2017-02-28 | Infineon Technologies Ag | Semiconductor device |
DE102009045181B4 (de) | 2009-09-30 | 2020-07-09 | Infineon Technologies Ag | Leistungshalbleitermodul |
US8410600B2 (en) * | 2009-10-02 | 2013-04-02 | Arkansas Power Electronics International, Inc. | Semiconductor device with protecting film and method of fabricating the semiconductor device with protecting film |
DE102011115886B4 (de) | 2011-10-15 | 2020-06-18 | Danfoss Silicon Power Gmbh | Verfahren zur Schaffung einer Verbindung eines Leistungshalbleiterchips mit oberseitigen Potentialflächen zu Dickdrähten |
-
2011
- 2011-10-15 DE DE102011115887A patent/DE102011115887A1/de active Pending
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2012
- 2012-09-10 EP EP12769904.9A patent/EP2766922A1/de active Pending
- 2012-09-10 CN CN201280050678.XA patent/CN103890924B/zh active Active
- 2012-09-10 US US14/346,458 patent/US9318421B2/en active Active
- 2012-09-10 WO PCT/EP2012/003787 patent/WO2013053420A1/de active Application Filing
- 2012-09-10 JP JP2014533780A patent/JP5837697B2/ja active Active
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2016
- 2016-04-11 US US15/095,802 patent/US9613929B2/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016108656A1 (de) | 2016-05-11 | 2017-11-16 | Danfoss Silicon Power Gmbh | Leistungselektronische Baugruppe mit vibrationsfreier Kontaktierung |
Also Published As
Publication number | Publication date |
---|---|
US20140225247A1 (en) | 2014-08-14 |
US9613929B2 (en) | 2017-04-04 |
CN103890924A (zh) | 2014-06-25 |
WO2013053420A1 (de) | 2013-04-18 |
CN103890924B (zh) | 2017-02-15 |
DE102011115887A1 (de) | 2013-04-18 |
JP2014532308A (ja) | 2014-12-04 |
US20160225738A1 (en) | 2016-08-04 |
US9318421B2 (en) | 2016-04-19 |
JP5837697B2 (ja) | 2015-12-24 |
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