EP0172889A1 - Assemblage de puce de circuit integre - Google Patents

Assemblage de puce de circuit integre

Info

Publication number
EP0172889A1
EP0172889A1 EP85901243A EP85901243A EP0172889A1 EP 0172889 A1 EP0172889 A1 EP 0172889A1 EP 85901243 A EP85901243 A EP 85901243A EP 85901243 A EP85901243 A EP 85901243A EP 0172889 A1 EP0172889 A1 EP 0172889A1
Authority
EP
European Patent Office
Prior art keywords
chip
wafer
substrate
conductive
chips
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
Application number
EP85901243A
Other languages
German (de)
English (en)
Inventor
Kwok Kwok Ng
Simon Min Sze
King Lien Tai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
AT&T Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US06/581,336 external-priority patent/USH208H/en
Priority claimed from US06/581,259 external-priority patent/US4613891A/en
Priority claimed from US06/582,079 external-priority patent/US4670770A/en
Application filed by American Telephone and Telegraph Co Inc, AT&T Corp filed Critical American Telephone and Telegraph Co Inc
Publication of EP0172889A1 publication Critical patent/EP0172889A1/fr
Pending legal-status Critical Current

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Definitions

  • the invention is concerned with integrated circuit technology.
  • Integrated circuit chips are assembled on a single-crystal carrier substrate and are electrically interconnected. Silicon is a preferred substrate material.
  • the positioning of a least one chip on the carrier substrate involves bringing at least one beveled sidewall of said at least one chip in juxtaposition with a sloping wall of a surface depression such as, e.g., a well, groove or opening in the carrier substrate.
  • Substrate and chip materials are crystallographically compatible, essentially single-crystal materials, and they are preferably essentially the same.
  • Sloping walls are made by crystallographically anisotropic etching which acts at differing rates in different crystallographic directions; angles other than 90 degrees are thus produced between etched surfaces and surfaces which are not exposed to an etchant.
  • alignment of chips involves match-up between two or four pairs of sloping faces, e.g., when chips are aligned in grooves or in four-sided wells.
  • Electrical connection can be effected by contacts on sloping walls; alternatively, connections can be made by one or several conductive paths analyzing the chip and the substrate.
  • an assembly is made to comprise at least one integrated circuit chip, active surface up, to the top side of a wafer.
  • Conductive pads are located in a central portion of the top surface of the mounted chip.
  • the top side of the wafer and all but peripheral portions of the attached chip(s) are then coated with an etch-resistance layer.
  • each chip is etched to form sloped edges between the active area of the device and the top side of the wafer.
  • conductive patterns are defined and formed on the top side of the wafer and on at least one of the sloped edges to connect the chip pads to pads on other chips or to conductive terminals disposed along the periphery of the wafer or to both.
  • the wafer-size assembly thus made is further processed (for example, encapsulated) in conventional ways and is then available as a monolithic component exhibiting advantageous performance and cost characteristics.
  • at least one chip of the type described is mounted on each side of a wafer. Additionally, connections may be established between chips mounted on the two sides of the wafer. In these ways, a particularly compact and dense wafer-size assembly is realized.
  • an assembly is made to comprise at least one chip which is mounted on the bottom side of a wafer. Conductive pads are located in a central portion of the top surface of the mounted chip. The wafer is then patterned to form a sloped-wall through-aperture in registry with the central portion, and thus with the conductive pads, of each mounted chip. Subsequently, by utilizing standard integrated-circuit fabrication techniques, a conductive pattern is formed overlying the top side of the wafer and on the sloped walls to connect the conductive pads of each chip to other chips or to conductive terminals on the top side of the wafer near the periphery thereof or to both.
  • the wafer-size assembly thus made is further processed (for example, encapsulated) in conventional ways and is then available as a monolithic component for inclusion in an electronic system.
  • FIG. 1 is a schematic, cross-sectional view of a portion of a circuit chip
  • FIG. 2 is a schematic, cross-sectional view of a portion of a wafer
  • FIG. 3 is a reduced-scale, schematic plan view of an integrated circuit assembly illustrating a ground metallization layer and a power metallization layer deposited side by side;
  • FIGS. 4, 5 and 6 are schematic cross-sectional views of an integrated circuit assembly at different stages of manufacture;
  • FIGS. 7 through 14 are schematic representations, not drawn to scale, of portions of a specific illustrative assembly;
  • FIGS. 15 through 24 are schematic representations, not drawn to scale, of portions of a specific illustrative assembly.
  • a substrate is a material body which has a surface which can serve as a support for material objects which may be insufficiently rigid in the absence of support or whose spatial arrangement depends on the presence of a support.
  • a substrate typically is relatively thin as compared with a planar extent.
  • a carrier substrate and a chip are mutually defined as substrates of relatively larger and smaller size, respectively, so that a plurality of chips can be attached to a carrier substrate.
  • An integrated circuit is a miniaturized electrical circuit which is supported by a substrate.
  • Preferential etching or crystallographically anisotropic etching is a chemical process which results in removal of surface matter at rates which differ depending on crystallographic direction in an essentially single- crystal material.
  • preferential etching is applicable to at least a portion of substrate material and at least a portion of chip material.
  • Such portions are here designated as body portions, and it is understood that substrate and chip may comprise portions other than such body portions such as, e.g., devices, circuits, and passive components.
  • FIG. 1 shows chip 1 , integrated circuit 2 with contact pads 3, insulating layer 4, metallic contact 15 which is preferably solder-wettable as, e.g., when consisting essentially of a Ti-Pd-Au or Cr-Cu-Au alloy, and soldei. metal 6. Beveled portions of chip 1 preferably have
  • FIG. 2 shows carrier substrate 7 which serves as electrical ground electrode and which is heavily doped at the surface, insulating oxide layer 8, power supply metallic conductor 9, x-signal metallic conductor 10, y- signal metallic conductor 11, metallic contact, stripe 12, polymeric insulating layers 13, cap layer 14 made, e.g., of silicon nitride, and solder metal layer 15.
  • the material of conductors 9, 10, and 11 is typically aluminum, and the material of metallic contact 12 is preferably solder wettable as, e.g., when consisting essentially of a Ti-Pd- Au or Cr-Cu-Au alloy.
  • Metallization 9, oxide layer 8, and substrate 7 form a metal-oxide-semiconductor decoupling capacitor. Electrical contact stripe 12 is shown connected to x-conductor 10; other contact stripes (not shown) may be connected to power supply 9 or y-conductor 13.
  • FIG. 3 shows wafer 7 serving as carrier substrate for chips 1, ground metallization layer 16, and power metallization layer 17.
  • Ground metallization layer 16 is electrically connected to heavily doped silicon substrate 7, and power layer 17 is deposited on a thin insulating layer, e.g., layer 8 as shown in FIG. 2.
  • the material of chip 1 and of carrier substrate 7 in FIGS. 2 and 3 is preferably the same, essentially single-crystal material which is amenable to preferential etching. Silicon is a primary example of such a material, potassium hydroxide being a convenient etchant in this case. (Etching of silicon for mask alignment is disclosed in U. S. patent No. 4,470,875.)
  • III-V semiconductor compounds such as, e.g.. gallium arsenide and gallium arsenide indium phosphide.
  • unpackaged silicon chips are mounted onto a silicon wafer which serves as carrier substrate.
  • Inter-chip connections are provided by two levels of signal nets with 5-15 ym wide conductive paths, power plane and a ground plane.
  • a photodefinable polymer such as, -e.g., a photosensitive polyimide
  • Methods to interconnect the chips and the wafer include techniques such as, e.g., wire bonding, tape- automatic bonding or "flip-chip" solder balls on solder pads.
  • self- aligned micro-stripes of solder metal on the chip can be used to connect to similar stripes on the wafer.
  • chips with precisely oriented beveled sides ((111) faces) by anisotropic wet etching of wafers having (100) surface planes, with the resulting beveled faces at an angle of 54-55 degrees. These can be inserted into matching beveled wells in silicon wafers, with an angle of 126-125 degrees between the bevel and the wafer plane.
  • Micro-solder stripes over the beveled oxides of the chips and wells can be defined in a CVD deposited, evaporated or sputtered resist, such as, e.g.,
  • Passive components such as resistors, capacitors and crystal oscillators can be incorporated into the silicon wafer by mounting on similarly beveled silicon plugs which are fitted into wells in the wafer.
  • optical fibers may terminate on a chip which may carry, e.g., an optical detector or a laser.
  • Beveled silicon planes can also be used for interconnection changes or customizations. Some wells may traverse the entire wafer thickness to allow interconnection, changes, or repairs on a circuit.
  • one wafer can replace a printed wiring board to form a subsystem or a system. This is advantageous because the high chip packing density allows short average interconnection lengths, short delay times, and lower capacitance and power consumption. Simultaneous switching noise induced by the inductance of the bonding wires is eliminated.
  • the self-aligned micro-solder stripes technique can provide an input/output of 400-800 I/O channels per chip without penalty in chip packing density.
  • the all- silicon system proposed alleviates the present reliability problems due to thermal mismatch between silicon, ceramics and printed circuit board materials, and the high thermal conductivity of silicon minimizes the danger of overheating of the components.
  • An example of an application is a "memory pack" consisting of a set of wafers stacked together, each wafer having an array of high density memory chips. Such a pack offers the speed of a random access memory and the mass storage capacity of a disc.
  • the entire system can be designed by existing computer aided design processes and computer aided testing can be implemented.
  • the drastic increase in I/O capability and chip packing density should provide new opportunities in system architecture. Since the penalty of "going off" the chip is removed, there is a lesser need to increase the number of circuits per chip. Thus, yield would be increased as the chip sizes are reduced. Furthermore, faster circuits with submicron design rules become manufacturable as the chip size shrinks.
  • FIGS. 4, 5, and 6 shown substrate 18, chip 19, insulating filler 20, and integrated circuit 21 with contact pads 22.
  • FIGS. 5 and 6 further show planarized insulating layer 23, electrical conductor 24, and contact pads 25.
  • FIG. 6 further shows planarized insulating layer 26 and electrical conductors 27.
  • Substrate 18 and chip i9 in FIG. 4-6 are preferably made of the same, essentially single-crystal material which is amenable to preferential etching, silicon being a primary example of such material.
  • Circuits are produced on chip-size portions of a substrate in customary fashion by deposition of layers and photolithographic patterning.
  • a layer of silicon nitride is deposited on front and back sides of the silicon wafer, a layer of a photoresist material is deposited on the silicon nitride on the back side, and a pattern corresponding to desired chips or openings is optically projected onto the photoresist layer.
  • the exposed photoresist is developed, and the developed pattern is copied into the silicon nitride layer, e.g., by reactive ion etching.
  • etching of the exposed portions of the silicon wafer is conveniently effected by the use of, e.g., potassium hydroxide as an etchant using a silicon nitride mask; etching may be partly into the wafer or through its entire thickness. Etch rate-is typically such
  • Etched chips are inserted into correspondingly etched grooves, wells, or openings in wafers; attachment by means of an insulating adhesive is convenient.
  • the surface of an inserted chip is preferably essentially co-planar with the' wafer surface.
  • a layer of a planarizing material such as, e.g., a polyimide or other photo-definable polymer, is deposited over the assembly, and holes corresponding to underlying circuit contact pads are etched by photolithographic patterning followed by reactive ion etching.
  • a metallization such as, e.g., an aluminum metallization is applied and patterned by reactive ion etching.
  • III-V semiconductor compounds such as, e.g., gallium arsenide and gallium arsenide indium phosphide.
  • advantages of the new insulating circuit assembly are the following:
  • FIG. 7 shows a wafer 28 that constitutes an integral part of an assembly made in accordance with the principles of the present invention.
  • the wafer 28 comprises a disc about 75-to-150 millimeters in diameter, with a thickness _t of approximately
  • the wafer 28 comprises a monocrystalline silicon wafer.
  • FIG. 8 shows in enlarged form a portion of the afore-described wafer 28. Additionally, FIG. 8 depicts a microminiature device, for example a silicon-integrated- circuit chip 29, adhered to the top of the wafer 28 by means of a bonding layer 31.
  • the layer 31 comprises an adhesive material such as a conventional polyimide material or a silicon dioxide layer.
  • the layer 31 is spun on the bottom surface of the chip 29 to a thickness of about 0..1-to- 10 micrometers before the chip 29 is placed in contact with the wafer 28.
  • one or more microminiature devices such as the chip 29 are adhered to the top side of the wafer 28 depicted in FIG. 17.
  • the chip 59 is, for example, about 0.25-to-0.75 millimeters thick and includes a -square top surface about six millimeters on a side. In some applications of applicant's invention, as many as 100 or even more devices of various designs and types are mounted on the top side of the wafer 28.
  • the devices mounted on the wafer 28 constitute chips cut from a wafer of monocrystalline silicon whose top and bottom surfaces were parallel (100) crystalline planes of the silicon structure. Accordingly, the top and bottom surfaces of each chip mounted on the wafer 28 also lie in (100) planes. The reason for selecting this particular orientation will be evident later below when a preferential etching step included in the fabrication sequence for the assembly is described.
  • multiple devices of various designs and types can be mounted on the bottom, as well as on the top, of the wafer 28. This is indicated in FIG. 8 wherein a device 30 is shown mounted on the bottom side of the wafer 28 by means of adhesive layer 32.
  • The- top of the chip 29 and the bottom .of the chip 30 shown in FIG. 8, respectively, constitute the so- called active sides thereof. Included on the active side of each chip are standard elements such as transistors (not shown), alignment marks (not shown), etc. Also included thereon are multiple relatively small-area conductive pads. Three such pads 33, 35, and 37 on chip 29, and three such pads 34, 36 and 38 on the chip 30, are schematically depicted in FIG. 8. Each pad has, for example, a square surface area only about 2.5-to-10 micrometers on a side.
  • the small-area pads included on the chips 29 and 30 can be located anywhere within the central region of the top surface thereof.
  • the pads are not limited to being located along the periphery of the central region.
  • some of the pads can be located in or towards the middle of the central region. This is advantageous because it reduces the total lead length required on a chip. As a result, the losses and delays experienced by signals that are propagated from the chip to associated circuitry are reduced.
  • the combination of reduced lead length and small-area pads leaves more of the active area available for other elements. Consequently, denser integrated designs are thereby made feasible.
  • FIGS. 9 through 13 emphasis hereinafter in connection with the description of FIGS. 9 through 13 will be directed to a portion of an assembly in which a single device (the chip 29) is mounted on the top side of the wafer 28. It is to be understood, however, that what is said about the processing of the chip 29 is also applicable to the processing of one or more additional devices mounted on the top side of the wafer 28 and to the processing of at least one additional device (such as the chip 30 of FIG. 8) mounted on the bottom side of the wafer 28.
  • sloped edges are formed on each of the devices mounted on the wafer 28. These sloped edges extend from the perimeter of the central region of each device toward the wafer side on which the device is mounted.
  • edges are formed in a particular well-defined etching step in which each chip mounted on the wafer 28 is inherently preferentially etched to reveal (111) planes that constitute the desired sloped edges.
  • FIG. 9 which shows a portion of the assembly taken along lines 43 in FIG. 10
  • each edge to be formed on the chip 29 will be inclined at an angle of 54-55 degrees with respect to the top surface of the chip 29.
  • a peripheral band of th'e top surface of the chip 29 will be removed by etching.
  • this band need not be continuous or closed.
  • one sloped edge per chip may be sufficient to satisfy the purposes of the invention.
  • the width w (FIG. 9) of this band is about 300-to-1000 micrometers.
  • the sloped-edge chip 29 whose outline is represented in FIG. 9 is formed by selectively masking the top surface of the chip 29 and then exposing the chip to a wet etchant such as a solution of potassium hydroxide.
  • a suitable etch-resistant mask for such an etchant is made, for example, of silicon nitride.
  • a layer 41 of silicon nitride patterned by conventional lithographic techniques is shown in FIG. 9.
  • an etch-resistant layer is also formed on the top surface of the wafer prior to defining the afore-specified sloped edges on the mounted chip(s).
  • Such an etch-resistant layer 42 made of silicon nitride is indicated in FIG. 9.
  • the layers 41 and 42 are each approximately 200 nm thick.
  • An advantageous etchant for forming the afore- described sloped edges on the chip 29 comprises approximately 250 grams of potassium hydroxide dissolved in 0.8 liters of water and 0.2 liters of propanol. Etching for about 3-to-10 hours with such a solution is effective to form the desired sloped edges. Subsequently, the silicon nitride masking layers 41 and 42 can be removed by, for example, etching the structure in hot phosphoric acid, as is well known in the art. At that point in the fabrication sequence, an assembly made in accordance with applicant's invention appears as depicted in the perspective view of FIG. 10.
  • the afore-specified slope of the edges of the chip 29 is not critical.
  • the sloped edges merely serve to facilitate the formation of conductive runners thereon.
  • the next step in applicant's inventive fabrication sequence is to form an insulating layer 44 over the entire top surface of the depicted assembly.
  • the layer 44 comprises a deposited layer of silicon dioxide about one micrometer thick.
  • Etching of the layer 44 is then carried out in a standard fashion utilizing conventional integrated-circuit patterning techniques to provide an opening in the layer 44 in registry with the conductive pad 35. In that way, the top surface of the conductive pad 35 is exposed, as indicated in FIG. 12.
  • a conductive*layer approximately one micrometer thick made, for example, of aluminum is deposited over the entire top surface of the assembly shown in FIG. 12.
  • the conductive layer is then patterned by conformal lithographic techniques (utilizing, for example, a germanium selenide resist) to form fine-line runners that extend from the chip pads, down one or more of the oxide-coated sloped edges of each chip and onto the main top surface of the assembly. In turn, these runners extend to conductive pads included on other mounted chips and/or to relatively large-area pads disposed around the periphery of the chip-wafer assembly.
  • a single conductive runner 45 is represented in FIG. 13.
  • the runner 45 contacts the pad 35 on the chip 29 and extends down one sloped edge of the chip 29 to overlie the silicon dioxide layer 44 that constitutes the main top surface of the depicted assembly.
  • additional alternating insulating and conductive layers may be deposited on top of the assembly represented in FIG. 13.
  • multi-level conductive patterns may be formed in the assembly.
  • planar conductors may be utilized, for example, as low- resistance low-inductance ground and/or power plane.
  • FIG. 14 is a top schematic view of a portion of an assembly made in accordance with the principles of the present invention.
  • a suitable standard encapsulant for the assembly may be advantageous but is not shown in FIG. 14.
  • four chips are indicated as being included in the depicted assembly.
  • Three chips 46, 47 and 48 are shown mounted overlying the top of the wafer 28 and one chip 49 is represented as being mounted on the bottom of the wafer 28.
  • one chip 49 is represented as being mounted on the bottom of the wafer 28.
  • each such chip typically has multiple (for example, 100 or more) leads extending therefrom. So as not to unduly clutter FIG.
  • each top-mounted chip is shown in this simplified depiction as including at least three but not more than five leads.
  • mounted chip 47 in FIG. -14 is represented as having five leads connected thereto.
  • Lead 50 of the chip 47 extends to adjacent chip 46.
  • Leads 51 and 52 interconnect the chips 47 and 48.
  • leads 53 and 54 respectively, extend between the chip 47 and peripheral conductive pads 55 and 56.
  • each of the interconnecting leads shown in FIG. 14 has a width d_ of approximately 1-to-10 micrometers.
  • each of the peripheral pads shown therein is about 1.25-by-1.25 millimeters.
  • the wafer 28 may be made of a material other than silicon. In selecting an alternative material, factors such as matching the thermal properties of the wafer to those of the associated chips are to be considered.
  • FIG. 15 shows a wafer 57 that constitutes an integral part of an assembly made in accordance with the. principles of the present invention.
  • the wafer 57 is made of monocrystalline silicon and is cut in the form of a disc about 75-to-150 millimeters in diameter, with a thickness t: of approximately 0.5 millimeters.
  • the top and bottom surfaces of the wafer 57 are parallel and lie in (100) crystalline planes of the silicon structure. The reason for selecting this particular orientation will be evident later below when a preferential etching step included in the fabrication sequence for the assembly is described.
  • an etch-resistant layer 58 shown in FIG. 16 is deposited on the entire bottom surface of the wafer 57.
  • the layer 58 comprises silicon nitride deposited to a thickness of approximately 100 nm.
  • FIG. 17 shows in enlarged form a portion of the afore-described wafer 10 and layer 58. Additionally, FIG. 17 depicts a microminiature device, for example, a silicon-integrated-circuit chip 59, adhered to the bottom of the layer 58 by means of a bonding layer 60.
  • the layer 60 comprises an adhesive material such as a conventional layer of silicon dioxide or a standard polyimide material.
  • the layer 60 is spun on the top surface of the chip 59 to a thickness of about 0.1-to-10 micrometers before the chip 59 is placed in contact with the layer 58.
  • one or more microminiature devices such as the chip 59 are adhered to the underside of the wafer 57 depicted in FIG. 3.
  • the chip 29 is, for example, about 0.25-to-0.75 millimeters thick and includes a square top surface about six millimeters on a side.
  • as many as 100 or even more devices of various designs and types are mounted on the underside of the wafer 59.
  • the top of the chip 59 shown in FIG. 17 constitutes the so-called active side thereof. Included on the active side of the chip are standard elements such as transistors (not shown), alignment marks (not shown), etc. Also included thereon are multiple relatively small-area conductive pads.
  • each pad has, for example, a square top surface area only about 2.5-to- 10 micrometers on a side.
  • the small-area pads included on the chip 59 can be located anywhere within the central region of the top surface. In other words, the pads are not limited to being located along the periphery of the central region. Thus, as indicated in FIG. 17, some of the pads can be located in or towards the middle of the central region. This is advantageous because it reduces the total lead length required on the chip. As a result, the losses and delays experienced by signals that are propagated from the chip to associated circuitry are reduced. Moreover, the combination of reduced lead length and small-area pads leaves more of the active, area available for other elements. Consequently, denser integrated circuit designs are thereby made feasible.
  • a well-defined through-aperture with four sloped walls is formed in the wafer in registry with the central region of each mounted device such as the chip 59.
  • the apertures are formed in a particular wet etching step in which the wafer 57 is inherently preferentially etched to reveal (111) planes that constitute the desired sloped walls.
  • each wall to be formed in the wafer 57 will be inclined at an angle of 35-36 degrees with respect to vertical walls through the wafer.
  • each sloped-wall through-aperture in the wafer 57 is designed -to overlie only the central region of an associated chip. In that way, a peripheral band of the chip that does not include conductive pads remains adhered to the underside of the wafer.
  • the width w (FIG. 18) of this band is, for example, about 10-to-250 micrometers. Of course, this band need not be continuous or closed or uniform in width.
  • the through-aperture whose outline is represented' in FIG. 18 is formed by selectively masking the top surface of the wafer 57 and then exposing the wafer to a wet etchant such as a solution of potassium hydroxide.
  • a wet etchant such as a solution of potassium hydroxide.
  • a suitable etch-resistant mask for such an etchant is made, for example, of silicon nitride.
  • a layer 66 of silicon nitride patterned by conventional lithographic techniques is shown in FIG. 18.
  • the layer 66 is approximately 200 n thick.
  • An advantageous etchant for forming the afore- described through-aperture in the wafer 57 comprises approximately 250 grams of potassium hydroxide dissolved in 0.8 liters of water and 0.2 liters of propanol. Etching for about 3-to-10 hours with such a solution is effective to form the desired sloped-wall aperture(s) in the herein- specified wafer 57. Subsequently, the top silicon nitride masking layer 66 and that portion of the bottom silicon nitride layer 58 directly underlying the smaller opening of the aperture can be removed by, for example, etching the structure in hot phosphoric acid, as is well known in the art .
  • FIGS. 19 and 20 an assembly made in accordance with applicant's invention appears as depicted in FIGS. 19 and 20.
  • the adhesive layer 60 is partially broken away to show some of the small-area conductive pads included on the chip 59. These include the previously specified pads 61 , -62 and 63.
  • the entire exposed portion of the adhesive layer 60 shown in FIG. 20 may be removed by utilizing a standard etchant therefor. Alternatively, it may be advantageous to leave the layer 60 substantially intact and to subsequently etch only small-area openings therethrough in registry with associated underlying conductive pads on the chip 59. In the further fabrication steps described below, this latter alternative approach will be specified.
  • the next step in applicant's inventive fabrication sequence is to form an insulating layer 67 over the entire top surface of the depicted assembly.
  • the layer 67 comprises a deposited layer of silicon dioxide about one micrometer thick.
  • Etching of the layer 67 is then carried out in a standard fashion utilizing conventional integrated-circuit patterning techniques to provide an opening in the layer 67 in registry with the conductive pad 62. Either in the same step in which the layer 67 is etched or in a subsequent etching step, a corresponding opening is also formed in the adhesive layer 60. In that way, the top surface of the conductive pad 62 is exposed, as indicated in FIG. 22. Next, a conductive layer approximately one micrometer thick made, for example, of aluminum is deposited over the entire top surface of the assembly shown in FIG. 22.
  • the conductive layer is then patterned by conformal lithographic techniques (utilizing, for example, a germanium selenide resist) to form fine-line runners that extend from the chip pads, up one or more of the sloping walls of the aperture associated with each chip and onto the main top surface of the assembly. In turn, these runners extend to other mounted chips and/or to relatively large-area pads disposed around the periphery of the chip- wafer assembly.
  • conformal lithographic techniques utilizing, for example, a germanium selenide resist
  • a single conductive runner 68 is represented in FIG. 23.
  • the runner 68 contacts the pad 62 on the chip 59 and extends up one sloped wall of the depicted aperture to overlie the silicon dioxide layer 67 that constitutes the main top surface of the depicted assembly.
  • additional alternating insulating and conductive layers may be deposited on top of the assembly represented in FIG. 23.
  • multi-level conductive patterns may be formed in the assembly.
  • planar conductors may be utilized, for example, as low- resistance low-inductance ground and/or power planes.
  • FIG. 24 is a top schematic view of a portion of an assembly made in accordance with the principles of the present invention. (A suitable standard encapsulant for the assembly may be advantageous but is not shown in
  • FIG. 24 For representative purposes only, twenty-four chips are indicated as being included in the depicted assembly. (In a 150-millimeter wafer, it is feasible to include as many as 500 mounted chips.) In practice, each such chip typically has multiple (for example, 100 or more) leads extending therefrom. So as not to unduly clutter FIG. 24, however, each mounted chip is shown in this simplified depiction as including at least one but not more than seven leads.
  • mounted chip 81 in FIG. 24 is represented as having seven leads connected thereto, Leads 82 and 83 of the chip 81 , respectively, extend to adjacent chips 69 and 70. Additionally, leads 71 through 75, respectively, extend between the chip 81 and peripheral conductive pads 76 through 80.
  • each of the interconnecting leads shown in FIG. 24 has a width d_ of approximately 1-to- 10 micrometers.
  • each of the peripheral pads shown therein is about 1.25-by-1.25 millimeters.

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Abstract

Assemblage de puce de circuit intégré dans lequel au moins une puce de circuit intégré (p.ex. 46-48, 49) est fixée sur un substrat (p.ex. 26) d'un matériau monocristallin, cette puce étant connectée électriquement à un réseau de circuit connecté de manière lithographique (p.ex. 50-54) sur le substrat. Les puces peuvent être placées sur la partie supérieure ou la partie inférieure du substrat ou les deux, et peuvent être placées dans des puits ou rainures dans le substrat, ou alors elles peuvent être placées au-dessus ou sous les puits ou rainures par fixation périphérique des puces. Les parois des puits ou rainures permettent l'alignement par correspondance des bords biseautés de certaines puces. Un réseau de circuit peut également être appliqué sur les parois de certains puits pour permettre des connexions aux puces fixées sous le substrat.
EP85901243A 1984-02-17 1985-02-15 Assemblage de puce de circuit integre Pending EP0172889A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US58126084A 1984-02-17 1984-02-17
US581259 1984-02-17
US581260 1984-02-17
US581336 1984-02-17
US06/581,336 USH208H (en) 1984-02-17 1984-02-17 Packaging microminiature devices
US06/581,259 US4613891A (en) 1984-02-17 1984-02-17 Packaging microminiature devices
US06/582,079 US4670770A (en) 1984-02-21 1984-02-21 Integrated circuit chip-and-substrate assembly
US582079 1984-02-21

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EP0172889A1 true EP0172889A1 (fr) 1986-03-05

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EP85901243A Pending EP0172889A1 (fr) 1984-02-17 1985-02-15 Assemblage de puce de circuit integre

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GB2047466B (en) * 1979-02-24 1983-03-30 Int Computers Ltd Multi-level connection networks

Non-Patent Citations (1)

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EP0154431A1 (fr) 1985-09-11
WO1985003806A1 (fr) 1985-08-29
ES540478A0 (es) 1986-11-16
ES8700500A1 (es) 1986-11-16
EP0154431B1 (fr) 1989-08-16
DE3572421D1 (en) 1989-09-21

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