CN112736073B

CN112736073B - Silicon-based optical computation heterogeneous integrated module

Info

Publication number: CN112736073B
Application number: CN202011577277.2A
Authority: CN
Inventors: 薛海韵; 曹立强
Original assignee: National Center for Advanced Packaging Co Ltd
Current assignee: National Center for Advanced Packaging Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2022-07-12
Anticipated expiration: 2040-12-28
Also published as: CN112736073A

Abstract

The invention discloses a silicon-based optical computation heterogeneous integrated module structure, which comprises: carrying a slide; the silicon-based optical chip is provided with a positive mounting patch which is embedded in the slide glass; the electric chip is embedded in the slide glass, and the thickness of the silicon-based optical chip is greater than that of the electric chip; and the electric interconnection structure is electrically connected with the silicon-based optical chip to the electric chip.

Description

Silicon-based optical computation heterogeneous integrated module

Technical Field

The invention relates to the technical field of semiconductor packaging, in particular to a silicon-based optical computation heterogeneous integrated module based on a chip embedded slide structure with different thicknesses.

Background

For applications such as a photon computing GPU accelerator card, the internal optical interconnection and intercommunication and light source integration of a photon computing chip need to be realized, and how to utilize a microelectronic process to realize the rapid and batch introduction of external light sources of the photon computing chip becomes a bottleneck restricting the integration and miniaturization of the photon computing accelerator card.

For silicon optical interconnection between chips, many studies have been made on low-loss coupling of focused single-mode optics, but the implementation difficulty in the process is high, and how to balance the relationship between alignment tolerance and coupling efficiency becomes one of the key factors for whether the final silicon optical can be produced in mass production.

Along with the current semiconductor chip process node is smaller and smaller, the difficulty of relying on single chip system integration (SOC) is larger and larger, and in order to deal with Moore's law, the multi-chip stacking and heterogeneous chip packaging become the current mainstream system integration technology. The manufacturing of chips with different functions usually has process nodes more suitable for balancing performance and cost, for example, the thickness of driver and amplifier chips required in silicon optical interconnection is usually 150 um-200 um, while the thickness of silicon optical MPW chips is usually about 300um, in this case, heterogeneous chip packaging is performed, and since the heights of the chips are different, metal interconnection lines need to be increased in two dimensions of length and/or height, thereby bringing excessive electrical signal transmission loss; in addition, for a high-power chip, the common two-dimensional board-level packaging is also not beneficial to heat dissipation; for example, the rf chip generally needs to be grounded on the back surface, and a back gold surface or a metal electrode needs to be disposed at a position corresponding to the back surface of the chip.

For the problem of heterogeneous packaging integration of multiple chips (especially photoelectric chips), no mature heterogeneous packaging scheme exists in the industry at present, and various problems such as low integration level, limited system performance and the like generally exist.

Aiming at the problems of integration, miniaturization, optical alignment tolerance, coupling efficiency, electrical signal loss and the like of the heterogeneous packaging integration of the photoelectric chip, the invention provides the silicon-based optical computing heterogeneous integration module which can at least partially overcome the problems in the prior art, improve the performance of the integrated packaging of the photoelectric heterogeneous chip system and expand the application scene of the integrated packaging.

Disclosure of Invention

Aiming at the problems of integration, miniaturization, optical alignment tolerance, coupling efficiency, electrical signal loss and the like faced by the heterogeneous packaging integration of the photoelectric chip, the invention provides a silicon-based optical computation heterogeneous integrated module structure according to one embodiment of the invention, which comprises the following components: carrying a slide; the silicon-based optical chip is provided with a positive mounting patch which is embedded in the carrier sheet; the electric chip is embedded in the slide glass, and the thickness of the silicon-based optical chip is greater than that of the electric chip; and the electric interconnection structure is electrically connected with the silicon-based optical chip to the electric chip.

In one embodiment of the present invention, the silicon-based optical chip is a silicon-based photon computing chip, and the silicon-based photon computing chip is a silicon-based modulator and/or detector and/or optical switch device; the electric chip is a driver chip and/or an amplifier chip and/or a power management chip.

In one embodiment of the invention, the silicon-based optical chip further comprises an optical receiving/transmitting device coupling area, and the optical receiving/transmitting device coupling area is provided with an optical receiving/transmitting device.

In one embodiment of the invention, the optical receiving/transmitting device coupling area is covered with a protective layer of optically transparent photosensitive material.

In an embodiment of the invention, the silicon-based optical computation heterogeneous integrated module structure further includes a conductive through hole, and the conductive through hole is electrically connected to the electric chip and/or the optical chip through the carrier, so that the back electrode of the electric chip and/or the optical chip is grounded.

According to another embodiment of the present invention, a silicon-based optical computing heterogeneous integrated module structure is provided, comprising: carrying a slide; the silicon-based optical chip is provided with a positive mounting patch which is embedded in the carrier sheet; the electric chip is embedded in the slide glass, and the thickness of the silicon-based optical chip is greater than that of the electric chip; a first electrical interconnect structure electrically connecting the silicon-based optical chip to the electrical chip; the physical layer serial-parallel conversion chip is embedded in the slide glass; a second electrical interconnect electrically connecting the electrical chip to the physical layer serial-to-parallel conversion chip; and the computer mainboard interface is electrically connected to the physical layer serial-parallel conversion chip.

In another embodiment of the present invention, the silicon-based optical computing heterogeneous integrated module structure further includes a first conductive through silicon via disposed in the carrier, where one end of the first conductive through silicon via is electrically connected to the physical layer serial-to-parallel conversion chip, and the other end of the first conductive through silicon via is electrically connected to the computer motherboard interface.

In another embodiment of the present invention, the silicon-based optical computing heterogeneous integrated module structure further includes a heat dissipation structure and a second conductive through silicon via disposed under the silicon-based optical chip and/or the electrical chip and/or the physical layer serial-parallel conversion chip.

In another embodiment of the present invention, the silicon-based optical chip is a silicon-based photon computing chip, and the silicon-based photon computing chip is a silicon-based modulator and/or detector and/or optical switch device; the electric chip is a driver chip and/or an amplifier chip and/or a power management chip; the physical layer serial-parallel conversion chip is a chip for realizing the conversion function of parallel high-speed electrical interconnection signals and parallel low-speed electrical interconnection signals.

In another embodiment of the present invention, the silicon-based optical chip further comprises an optical receiving/transmitting device coupling area, and the optical receiving/transmitting device coupling area is provided with an optical receiving/transmitting device.

The invention provides a silicon-based optical computation heterogeneous integrated module, which is formed by arranging chip embedded cavities with different depths in a slide glass through photoetching, etching and other processes, and arranging silicon-based photon computation chips, driver chips, amplifier chips and the like with different thicknesses in the slide glass through formal mounting patches. The silicon-based photon computing chip can be selected from a silicon-based modulator, a detector, an optical switch device and the like, can realize the functions of realizing optical signal interconnection and reconstructing related photon computing in the chip, and realizes the communication function by electric signals, replacing the original accelerator card, GPU and the like. After chips with different specifications are embedded, windowing is carried out on chip bonding pads and optical signal coupling areas of a silicon-based photon computing chip, a driver chip and an amplifier chip, in order to ensure that the optical coupling areas are not stained by subsequent processes, an optically transparent photosensitive material can be selected to protect the optical signal coupling areas, then a light source device or an optical signal transmission device can be pasted on the optical signal coupling areas, and direct current power supply of a light source can be realized through the bonding pads arranged on a slide glass. The silicon-based optical computation heterogeneous integrated module can be a traditional 4-channel or 8-channel module, can also be expanded according to actual needs so as to meet heterogeneous integration of chips and large modules with multiple specifications, and has the advantages of fast heat dissipation, simplicity in assembly, stability, reliability and the like.

Drawings

To further clarify the above and other advantages and features of embodiments of the present invention, a more particular description of embodiments of the invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings, the same or corresponding parts will be denoted by the same or similar reference numerals for clarity.

Fig. 1 shows a cross-sectional schematic view of a different thickness chip-embedded carrier structure 100, according to one embodiment of the present invention.

Fig. 2A to 2K are schematic cross-sectional views illustrating a process of forming such a chip-embedded chip carrier structure 100 with different thicknesses according to an embodiment of the present invention.

Fig. 3 illustrates a flow diagram 300 for forming such a different thickness chip embedded chip carrier structure 100, according to one embodiment of the present invention.

Fig. 4 is a cross-sectional view of a silicon-based optical computation heterogeneous integrated module structure 400 according to an embodiment of the invention.

Fig. 5 is a schematic top view of a silicon-based optical computing heterogeneous integrated module 400 according to still another embodiment of the invention.

Fig. 6 is a cross-sectional view of a silicon-based optical computing heterogeneous integrated module structure 600 according to another embodiment of the invention.

Fig. 7 shows a cross-sectional schematic diagram of a heterogeneous integrated silicon optical module structure 700 for computer board interconnection according to an embodiment of the invention.

Fig. 8 is a schematic top view of a heterogeneous integrated silicon optical module structure 700 for interconnection of computer boards according to an embodiment of the present invention.

Fig. 9 is a cross-sectional schematic diagram of a heterogeneous integrated silicon optical module structure 900 for interconnection of computer boards according to another embodiment of the present invention.

Fig. 10 is a cross-sectional view of a heterogeneous integrated silicon-based optoelectronic module structure 1000 for interconnection with a computer motherboard, according to an embodiment of the invention.

FIG. 11 is a cross-sectional view of a silicon-based optoelectronic hetero-integrated interconnect module structure 1100 according to an embodiment of the present invention.

FIG. 12 is a schematic top view of a silicon-based optoelectronic hetero-integrated interconnect module structure 1100 according to an embodiment of the present invention.

FIG. 13 is a cross-sectional view of a silicon-based optoelectronic hetero-integrated interconnect module structure 1300 according to another embodiment of the present invention.

Fig. 14 is a schematic top view of a silicon-based optoelectronic hetero-integrated interconnect module structure 1300 according to an embodiment of the present invention.

Detailed Description

In the following description, the invention is described with reference to various embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details, or with other alternative and/or additional methods, materials, or components. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of various embodiments of the invention. Similarly, for purposes of explanation, specific numbers, materials and configurations are set forth in order to provide a thorough understanding of the embodiments of the invention. However, the invention may be practiced without specific details. Further, it should be understood that the embodiments shown in the figures are illustrative representations and are not necessarily drawn to scale.

Reference in the specification to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

It should be noted that, in the embodiments of the present invention, the process steps are described in a specific order, however, this is only for convenience of distinguishing the steps, and the order of the steps is not limited, and in different embodiments of the present invention, the order of the steps may be adjusted according to the adjustment of the process.

The invention provides a silicon-based optical computation heterogeneous integrated module, which is formed by arranging chip embedded cavities with different depths in a slide glass through photoetching, etching and other processes, and arranging silicon-based photon computation chips, driver chips, amplifier chips and the like with different thicknesses in the slide glass through formal mounting patches. The silicon-based photon computing chip can be selected from a silicon-based modulator, a detector, an optical switch device and the like, can realize the functions of realizing optical signal interconnection and reconstructing related photon computing in the chip, and realizes the communication function by electric signals and replacing the original accelerator card, GPU and the like. After chips with different specifications are embedded, windowing is carried out on chip bonding pads and optical signal coupling areas of a silicon-based photon computing chip, a driver chip and an amplifier chip, in order to ensure that the optical coupling area is not contaminated by subsequent processes, an optically transparent photosensitive material can be selected to protect the optical signal coupling area, then a light source device or an optical signal transmission device can be pasted on the optical signal coupling area, and direct current power supply of a light source can be realized through the bonding pads arranged on a slide glass. The silicon-based optical computing heterogeneous integrated module can be a traditional 4-channel or 8-channel module, can also expand channels according to actual needs so as to meet heterogeneous integration of chips with multiple specifications and large modules, and has the advantages of quick heat dissipation, simplicity in assembly, stability, reliability and the like.

A chip embedding chip carrier structure with different thicknesses according to an embodiment of the present invention is described in detail below with reference to fig. 1. Fig. 1 shows a cross-sectional schematic view of a different thickness chip-embedded carrier structure 100, according to one embodiment of the present invention. As shown in fig. 1, the chip-embedded carrier structure 100 with different thicknesses further includes a carrier (carrier plate) 110, a first conductive via 120, a second conductive via 130, a first chip embedded cavity 141, a second chip embedded cavity 142, a third chip embedded cavity 143, a fourth chip embedded cavity 144, a fifth chip embedded cavity 145, a first chip 151, a second chip 152, a third chip 153, a fourth chip 154, a fifth chip 155, a first heat dissipation structure 161, a second heat dissipation structure 162, a third heat dissipation structure 163, a bottom-filling solder material 170, and a surface passivation layer 180.

The carrier sheet 110 is the base/substrate of the chip-embedded carrier structure 100 with different thicknesses, and in one embodiment of the invention, the carrier sheet 110 is a silicon wafer. In another embodiment of the present invention, the carrier sheet 110 may also be a glass carrier sheet, a PCB substrate, or other material carrier sheets. In other embodiments of the present invention, the carrier sheet 110 may also be ceramic or other carrier sheets with good heat dissipation properties.

The first conductive via 120 and the second conductive via 130 are disposed in the carrier 110, wherein the first conductive via 120 penetrates the upper and lower surfaces of the carrier 110, and the second conductive via 130 leaks from the chip embedding cavity after penetrating the carrier 110, so that the first conductive via 120 and the second conductive via 130 have different heights. In one embodiment of the present invention, the chip 110 is a silicon carrier, and the first conductive via 120 and/or the second conductive via 130 are conductive Through Silicon Vias (TSVs). In yet another embodiment of the present invention, the second conductive vias 130 may also have different heights.

The first chip embedding cavity 141, the second chip embedding cavity 142, the third chip embedding cavity 143, the fourth chip embedding cavity 144 and the fifth chip embedding cavity 145 are arranged from the front surface of the carrier sheet 110 to the inside, and the first chip embedding cavity 141, the second chip embedding cavity 142, the third chip embedding cavity 143, the fourth chip embedding cavity 144 and the fifth chip embedding cavity 145 have at least two different depths according to design requirements, so as to meet the embedding requirements of chips with different thicknesses. In one embodiment of the present invention, the first chip buried cavity 141, the second chip buried cavity 142, the third chip buried cavity 143, the fourth chip buried cavity 144, and the fifth chip buried cavity 145 have two different depths. In still another embodiment of the present invention, the first chip burying cavity 141, the second chip burying cavity 142, the third chip burying cavity 143, the fourth chip burying cavity 144, and the fifth chip burying cavity 145 have three or more depths. In still another embodiment of the present invention, the depths of the first chip embedded cavity 141, the second chip embedded cavity 142, the third chip embedded cavity 143, the fourth chip embedded cavity 144, and the fifth chip embedded cavity 145 are between 100um and 700 um. In a further embodiment of the invention, the first chip embedding cavity 141 and/or the second chip embedding cavity 142 and/or the third chip embedding cavity 143 and/or the fourth chip embedding cavity 144 and/or the fifth chip embedding cavity 145 may be square, circular, elliptical, hexagonal, triangular, etc. in shape, and its side walls may be vertical or sloped.

The first chip 151, the second chip 152, the third chip 153, the fourth chip 154, and the fifth chip 155 are mounted in the first chip embedded cavity 141, the second chip embedded cavity 142, the third chip embedded cavity 143, the fourth chip embedded cavity 144, and the fifth chip embedded cavity 145 by the underfill solder material 170. The underfill material 170 may be a soldering substance such as solder, low temperature nano silver paste, etc., and the underfill material 170 is electrically connected to the gold-back side or the back side electrode of the first chip 151 and/or the second chip 152 and/or the third chip 153 and/or the fourth chip 154 and/or the fifth chip 155, respectively, and is electrically connected to the second conductive via 130, so as to ground or lead the second conductive via 130 to the gold-back side or the back side electrode of the first chip 151 and/or the second chip 152 and/or the third chip 153 and/or the fourth chip 154 and/or the fifth chip 155.

In an embodiment of the present invention, a first heat dissipation structure 161, a second heat dissipation structure 162, and a third heat dissipation structure 163 are further disposed between the first chip 151, the second chip 152, the fourth chip 154, and the bottom surfaces of the first chip embedded cavity 141, the second chip embedded cavity 142, and the fourth chip embedded cavity 144, where the first heat dissipation structure 161 and/or the second heat dissipation structure 162 and/or the third heat dissipation structure 163 may be conductive copper pillars or metal layers with other shapes, where the first heat dissipation structure 161, the second heat dissipation structure 162, and the third heat dissipation structure 163 are respectively electrically connected to the second conductive via 130, and the first heat dissipation structure 161, the second heat dissipation structure 162, and the third heat dissipation structure are respectively electrically connected to the back electrodes or back gold surfaces of the first chip 151, the second chip 152, and the fourth chip 154, directly or through a solder material, so that the second conductive via 130 can be electrically connected to the first chip 151, the second chip 152, and the fourth chip 154, and the second conductive via 130 can be electrically connected to the back electrodes or the back gold surfaces, And the second chip back electrode or the back gold surface is grounded or led out.

The surface passivation layer 180 is disposed on the upper surface of the chip 110 and the sidewalls and bottom surface of the chip embedding cavity, but leaks through the first conductive via 120 and the second conductive via 130. In one embodiment of the present invention, the surface passivation layer 180 may be an insulating layer of deposited silicon oxide or silicon nitride, or directly thermally oxidized, with a thickness ranging from 10nm to 100 um.

The process of forming such different thickness chip embedded carrier structure 100 is described in detail below with reference to fig. 2A to 2K and fig. 3. Fig. 2A-2K are schematic cross-sectional views illustrating a process of forming such a chip-embedded carrier structure 100 of different thickness according to an embodiment of the present invention; fig. 3 illustrates a flow diagram 300 for forming such a different thickness chip embedded chip carrier structure 100, according to one embodiment of the present invention.

First, at step 301, as shown in fig. 2A, a first through-hole 202 and a second through-hole 203 are formed on a chip 201. In an embodiment of the invention, the TSV

deep holes

202 and 203 with different depths are manufactured on the surface of the silicon wafer 201 through photoetching and etching processes, the aperture ranges from 1um to 1000um, and the depth ranges from 10um to 1000 um.

Next, in step 302, as shown in fig. 2B, the first via 202 and the second via 203 are filled with a conductive material to form a first conductive via 204 and a second conductive via 205. In one embodiment of the invention, in the first step, an insulating layer of silicon oxide or silicon nitride is deposited above a silicon wafer, or directly thermally oxidized, and the thickness of the insulating layer ranges from 10nm to 100 um; secondly, a seed layer is manufactured above the insulating layer through physical sputtering, magnetron sputtering or evaporation process, the thickness of the seed layer ranges from 1nm to 100um, the seed layer can be one layer or multiple layers, and the metal material can be titanium, copper, aluminum, silver, palladium, gold, thallium, tin, nickel and the like; thirdly, electroplating metal copper to fill the first through hole 202 and the second through hole 203 with the copper metal; fourthly, densifying at the temperature of 200-500 ℃ to enable the copper to be more compact; fifthly, removing copper on the surface of the silicon wafer by using a copper CMP process, and only leaving a conductive through hole; and fifthly, removing the insulating layer on the surface of the silicon wafer by using a dry etching or wet etching process. In another embodiment of the present invention, the silicon wafer surface insulating layer can also be preserved. In another embodiment of the present invention, the silicon wafer of this step includes a 4, 6, 8, 12 inch wafer with a thickness ranging from 200um to 2000um, and may be made of other materials, such as inorganic materials, such as glass, quartz, silicon carbide, and alumina, or organic materials, such as epoxy resin and polyurethane, which mainly function to provide a supporting function.

Then, at step 303, thinning the backside of the chip 201 leaks out of the first conductive via 204, as shown in fig. 2C. In one embodiment of the present invention, the opening surfaces of the first conductive via 204 and the second conductive via 205 are temporarily bonded, and then the back surface of the carrier sheet 201 is thinned. In one embodiment of the present invention, the bottom of the first conductive via 204 may be exposed by dry etching; then depositing an oxide layer, such as silicon dioxide, on the exposed surface of the first conductive through hole 204, wherein the thickness of the oxide layer is 0.1um to 5 um; finally, a Chemical Mechanical Polishing (CMP) process is used to remove the oxide layer on the upper portion of the first conductive via 204, so as to obtain the carrier 201 with the exposed first conductive via 204.

Next, at step 304, as shown in fig. 2D, a first depth cavity 206 is formed at a vertical position of a portion of the second conductive via 205 on the back side of the chip 201. In one embodiment of the present invention, the first depth cavity 206 is formed by etching the silicon slide 201 after a patterned mask is formed by photolithography. In yet another embodiment of the present invention, the first depth cavity 206 may be further formed by forming a Hard Mask (Hard Mask) on the backside of the carrier 201, and then continuing to etch the silicon after forming a silicon etch opening by a photolithography and etching process. In one embodiment of the present invention, the first deep cavity 206 is formed on the back surface of the silicon wafer by photolithography and dry etching processes, and may have a square, circular, oval, hexagonal, triangular shape, etc., and the sidewall thereof may be vertical or sloped.

Then, in step 305, as shown in fig. 2E, etching is continued to form a second cavity 207 and a third cavity 208 above the second conductive via 205, respectively, and to leak out the second conductive via 205 at the bottom of the second cavity 207 and the third cavity 208. In one embodiment of the present invention, the second cavity 207 and the third cavity 208 are formed by etching from the back surface of the chip 201 and the bottom surface of the first depth cavity 206, respectively, by photolithography and etching processes, wherein the depth of the second cavity 207 is smaller than the depth of the third cavity 208. In yet another embodiment of the present invention, the second cavity 207 and the third cavity 208 have a depth ranging between 100nm and 700 um.

Next, at step 306, as shown in fig. 2F, a passivation layer 209 is formed on the back surface of the chip 201 and the inner sides and bottom of the second cavity 207 and the third cavity 208, and leaks out of the first conductive via 204 and the second conductive via 205. In an embodiment of the present invention, a passivation layer 209, which may be an insulating layer such as silicon oxide, silicon nitride, or a combination thereof, is formed on the back surface of the silicon wafer 201 and the inner sides and the bottom of the second cavity 207 and the third cavity 208 by a PECVD process, and finally the metal at the bottom of the TSV is exposed by photolithography and dry etching. In yet another embodiment of the present invention, the passivation layer 209 may also be formed by direct thermal oxidation on the silicon surface, the thickness of the passivation layer 209 ranging between 10nm and 100 um.

Then, in step 307, as shown in fig. 2G, a plating mask 210 and a plating opening 211 are formed on the back side of the carrier sheet 201 and inside the second cavity 207 and the third cavity 208. In an embodiment of the present invention, before the electroplating mask 210 is fabricated, an electroplating seed layer is fabricated above the passivation layer 209 by a physical sputtering, magnetron sputtering or evaporation process, the thickness of the electroplating seed layer ranges from 1nm to 100um, and the electroplating seed layer may be a single layer or multiple layers, and the metal material may be titanium, copper, aluminum, silver, palladium, gold, thallium, tin, nickel, chromium, etc.; and then, arranging photoresist on the surface, the side surface and the bottom of the groove of the adapter plate in a mode of spin coating or spraying the photoresist, wherein the thickness of the photoresist is 2-100 um, and then exposing to define the position of the metal column. The exposed metal pillar position can be on the top of the exposed metal pillar at the bottom, or on one side of the exposed metal pillar, next to the metal pillar, or any other position of the groove. In yet another embodiment of the present invention, the plating mask 210 is a negative photoresist, further may be a SU-8 type photoresist, so that a thicker mask and better opening contrast may be obtained.

Next, in step 308, as shown in fig. 2H, a first metal pillar 212, a second metal pillar 213 and a third metal pillar 214 are formed by electroplating, and the first metal pillar 212, the second metal pillar 213 and the third metal pillar 214 perform a heat dissipation function for a subsequent chip. In one embodiment of the present invention, the first metal pillar 212, the second metal pillar 213 and the third metal pillar 214 are disposed in different cavities, and the sizes thereof may be different according to design requirements. In another embodiment of the present invention, the first metal pillar 212, the second metal pillar 213 and the third metal pillar 214 may also be patterned metal layers. In yet another embodiment of the present invention, the height of the first metal pillar 212, the second metal pillar 213 and the third metal pillar 214 is between 2um and 100um, and the height of the metal pillars does not exceed the thickness of the plating mask 210 at the end of the plating process.

Then, in step 309, as shown in fig. 2I, the plating mask layer 210 is removed to obtain a second cavity 207 and a third cavity 208 structure with

metal pillars

212, 213, 214 with a certain height at the bottom. In an embodiment of the present invention, the plating mask layer 210 may be removed by a photoresist stripping process, and then the plating seed layer may be removed by an etching process to leak the passivation layer 209 on the back surface of the carrier 201, inside the second cavity 207, and inside the third cavity 208.

Next, at step 310, as shown in fig. 2J, the welding material 215 is laid inside the second cavity 207 and at the bottom of the third cavity 208. In one embodiment of the present invention, the inside of the second cavity 207 and the bottom of the third cavity 208 are filled with soldering materials such as solder, low temperature nano silver paste, etc. with different thicknesses.

Then, in step 311, as shown in fig. 2K, the first chip 216, the second chip 217, the third chip 218, the fourth chip 219, and the fifth chip 220 with different thicknesses are mounted in the second cavity 207 and/or the third cavity 208, so that chip embedding carrier structures with different thicknesses are formed. In one embodiment of the present invention, the first chip 216, the second chip 217, and the fourth chip 219 have a gold-backed or back electrode, and the gold-backed or back electrode is grounded or electrode-led through the underlying heat-dissipating metal pillar, the solder material, and the second conductive via. In another embodiment of the present invention, chips with different thicknesses are respectively mounted in the second cavity 207 or the third cavity 208 with corresponding depths, so that the exposed metal at the bottom of the cavity and the newly plated copper pillar are in contact with the back of the chip, or a certain specific distance is fixed, baking and curing are performed, and finally, the gap is filled, thereby completing the structure embedding of the chips with different thicknesses.

Finally, a re-layout wiring layer (RDL) can be formed on the front and/or back of the chip embedding chip with different thicknesses to realize the connection of electric and/or signals.

A silicon-based optical computing heterogeneous integrated module structure formed based on the chip-embedded carrier technology with different thicknesses is described in detail below with reference to fig. 4 and 5. FIG. 4 is a cross-sectional view of a silicon-based optical computation heterogeneous integrated module structure 400 according to an embodiment of the present invention; fig. 5 is a schematic top view of a silicon-based optical computing heterogeneous integrated module 400 according to still another embodiment of the invention. As shown in fig. 4 and 5, the silicon-based optical computing heterogeneous integrated module 400 further includes: the chip comprises a slide/carrier plate 401, a silicon-based photon counting chip (SiPh)402, a driver chip (DRV)403-1, an amplifier chip (TIA)403-2 and an interconnection structure 404.

The carrier/plate 401 is a substrate of the silicon-based optical computing hetero-integrated module structure 400, and in an embodiment of the present invention, the carrier/plate 401 is a silicon wafer. In another embodiment of the present invention, the carrier/plate 401 may also be a glass carrier, a PCB substrate, or other carrier. In other embodiments of the present invention, the carrier/plate 401 may also be ceramic or other carrier with good heat dissipation properties.

A silicon-based photon computing chip (SiPh)402 is embedded in the slide/carrier 401, and includes, but is not limited to, various silicon-based modulators, detectors, optical switching devices, and can implement communication functions by electrical signals and replacing the original accelerator card and GPU after implementing optical signal interconnection in the chip and reconstructing related photon computing functions. In one embodiment of the present invention, the silicon-based photonic computing chip (SiPh)402 is mounted into the embedded slot by forming the embedded slot of the silicon-based photonic computing chip (SiPh)402 in the carrier/plate 401 and then filling the slot bottom with a solder/paste material. In yet another embodiment of the present invention, the silicon-based photonic computing chip (SiPh)402 further comprises an optical receiving/transmitting device coupling region 4021 and a pad 4022, wherein the optical receiving/transmitting device coupling region 4021 may receive an optical signal from the outside or generate an optical signal by mounting a laser box light source or other semiconductor laser with appropriate wavelength and power, a vcsel, or other light source devices. In another embodiment of the present invention, in order to ensure that the optical receiving/transmitting device coupling area 4021 is not contaminated by the subsequent processes, an optically transparent photosensitive material, such as SU-8, may be selected for protection, and then a Flip-chip binder apparatus (such as suss FC150) is used to attach the laser box light source or other semiconductor laser device with appropriate wavelength and power, such as vcsel, to the optical receiving/transmitting device coupling area 4021, and the dc power supply of the light source may be implemented through a pad disposed on the carrier/carrier 401.

The driver chip (DRV)403-1 and the amplifier chip (TIA)403-2 are selected according to different silicon-based photonic computing chip (SiPh)402 performance, and are also mounted in the carrier/slide 401. The driver chip (DRV)403-1 and the amplifier chip (TIA)403-2 may have similar or different thicknesses, and the driver chip (DRV)403-1 and the amplifier chip (TIA)403-2 are provided with a chip pad 4031 for connecting with the silicon-based photonic computing chip (SiPh) 402. In one embodiment of the invention, the thickness of the driver chip (DRV)403-1 and the amplifier chip (TIA)403-2 is less than the thickness of the silicon-based photon counting chip (SiPh) 402.

The interconnect structure 404 is used to electrically connect the silicon-based photonic computing chip (SiPh)402 with the driver chip (DRV)403-1 and the amplifier chip (TIA) 403-2. In one embodiment of the invention, the interconnect structure 404 is a wire bond that electrically connects the bond pads 4022 of the silicon-based photonic computing chip (SiPh)402 to the driver chip (DRV)403-1 and/or the chip bond pads 4031 of the amplifier chip (TIA)403-2 through a wire bonding process.

The silicon-based optical computation heterogeneous integrated module structure can be a traditional 4-channel or 8-channel structure, and can also be used for expanding channels according to actual needs, so that heterogeneous integration of chips with multiple specifications and large modules can be met.

Still another silicon-based optical computing heterogeneous integrated module structure formed based on the chip-embedded carrier technology with different thicknesses will be described with reference to fig. 6. Fig. 6 is a cross-sectional view of a silicon-based optical computation heterogeneous integrated module structure 600 according to another embodiment of the present invention, as shown in fig. 6, the silicon-based optical computation heterogeneous integrated module structure 600 further includes: a chip carrier/carrier 601, a silicon-based photonic computing chip (SiPh)602, a driver chip (DRV)/amplifier chip (TIA)603, and an interconnect structure 604. Compared with the silicon-based optical computation heterogeneous integrated module structure 400 described above, the difference is that a chip heat dissipation structure 6033, a first conductive through hole 6023, and a second conductive through hole 6033 are further disposed on the chip back side of the silicon-based photonic computation chip (SiPh)602 and/or the driver chip (DRV)/amplifier chip (TIA)603, so as to achieve heat dissipation of the chip and/or grounding or leading-out of the back gold side/back side electrode.

A heterogeneous integrated silicon optical module structure for interconnection of computer boards based on the silicon-based optical computation heterogeneous integrated module structure is further described below with reference to fig. 7 and 8. FIG. 7 shows a cross-sectional schematic view of a hetero-integrated silicon optical module structure 700 for computer board interconnection, according to an embodiment of the present invention; fig. 8 is a schematic top view of a heterogeneous integrated silicon optical module structure 700 for interconnection of computer boards according to an embodiment of the present invention. As shown in fig. 7 and 8, the hetero-integrated silicon optical module structure 700 for interconnection of computer boards further includes: the chip-on-chip/carrier board 701, a silicon-based photon computing chip (SiPh)702, a driver chip (DRV)703-1, an amplifier chip (TIA)703-2, a first interconnect structure 704, a physical layer serial-parallel conversion chip 705, a second interconnect structure 706, a TSV via 707, a third interconnect structure 708, and a computer motherboard interface 709.

The carrier/board 701 is the base/substrate of the heterogeneous integrated silicon optical module structure 700 for interconnection of computer boards, and in one embodiment of the present invention, the carrier/board 701 is a silicon wafer. In another embodiment of the present invention, the carrier/plate 701 may also be a glass carrier, a PCB substrate, or other carrier. In other embodiments of the present invention, the carrier sheet 701 may also be a ceramic or other carrier sheet with good heat dissipation performance.

A silicon-based photonic computing chip (SiPh)702 is embedded in the carrier/carrier 701, and the silicon-based photonic computing chip 702 includes, but is not limited to, an integrated chip SiPh of an active passive device such as a silicon optical modulator, a detector, an optical arrayed waveguide grating, and the like. In one embodiment of the present invention, the silicon-based photonic computing chip (SiPh)702 is mounted into the embedded slot by forming the embedded slot of the silicon-based photonic computing chip (SiPh)702 on the carrier/plate 701 and then filling the slot bottom with solder/paste material. In yet another embodiment of the present invention, the silicon-based photonic computing chip (SiPh)702 further comprises an optical receiving/emitting device coupling region 7021 and a bonding pad 7022, wherein the optical receiving/emitting device coupling region 7021 may receive an optical signal from the outside or generate an optical signal by mounting a laser box light source or other semiconductor laser, vcsel, or other light source device with suitable wavelength and power. In another embodiment of the present invention, in order to ensure that the optical receiving/transmitting device coupling region 7021 is not contaminated by the subsequent processes, an optically transparent photosensitive material, such as SU-8, may be selected for protection, and then a Flip-chip binder apparatus (e.g., SUs FC150) is used to attach the laser box light source or other semiconductor laser device with suitable wavelength and power, such as vcsel, to the optical receiving/transmitting device coupling region 7021, and the dc power of the light source may be supplied through a pad disposed on the carrier plate 701.

The driver chip (DRV)703-1 and the amplifier chip (TIA)703-2 are selected correspondingly according to different silicon-based photonic computing chip (SiPh)702 performances, and are also installed in the carrier/slide plate 701. The driver chip (DRV)703-1 and the amplifier chip (TIA)703-2 may be similar or different in thickness, and the driver chip (DRV)703-1 and the amplifier chip (TIA)703-2 are provided with a chip pad 7031 for connecting with the silicon-based photonic computing chip (SiPh) 702. In one embodiment of the invention, the thickness of the driver chip (DRV)703-1 and the amplifier chip (TIA)703-2 is less than the thickness of the silicon-based photon counting chip (SiPh) 702.

The interconnect structure 704 is used to electrically connect the silicon-based photonic computing chip (SiPh)702 with the driver chip (DRV)703-1 and/or the amplifier chip (TIA) 703-2. In one embodiment of the invention, the interconnect structure 704 is a wire bond that electrically connects the bond pads 7022 of the silicon-based photonic computing chip (SiPh)702 to the chip bond pads 7031 of the driver chip (DRV)703-1 and/or the amplifier chip (TIA)703-2 by a wire bonding process.

The physical layer deserializing chip 705 is embedded in the carrier chip/carrier board 701, and the physical layer deserializing chip 705 can realize the conversion of parallel high-speed electrical interconnection signals and parallel low-speed electrical interconnection signals, so as to realize the direct signal matching between the electrical signals of the computer board card, such as multi-path 6.25Gbps signals, and the high-speed electrical interconnection signals, such as multi-path 25Gbps signals, in the optical interconnection. In one embodiment of the invention, the physical layer deserializer chip 705 is a PHY/Serdes chip. The physical layer serial-parallel conversion chip 705 further includes a first pad 7051 and a second pad 7052. In one embodiment of the invention, the electrical interconnection of the physical layer serial-to-parallel conversion chip 705 with the driver chip (DRV)703-1 and/or the amplifier chip (TIA)703-2 is achieved through a second interconnection structure 706. In a specific embodiment of the present invention, electrical interconnections are defined between N-channel high-speed electrical signals in a PHY/Serdes chip (physical layer serial-parallel conversion chip 705) and a driver chip (DRV)703-1 and/or an amplifier chip (TIA)703-2 through pad windowing on the surface of a chip/carrier 701, and in order to obtain a distance as short as possible and avoid electrical transmission loss of leads, interconnection reconfiguration can also be achieved through technologies such as RDL.

The TSV via 707 is electrically connected to the physical layer serial-parallel conversion chip 705 through the third interconnect structure 708, and is further connected to the computer motherboard interface 709. In an embodiment of the present invention, the physical layer serial-parallel conversion chip 705(PHY/Serdes chip) contains low-speed electrical interconnection signals and module control signals larger than 4N channels, which can be electrically interconnected through the carrier TSV via 707 and the sidewall pads to fan out to the back or side of the carrier, so as to implement a high-density and low-cost hetero-package integrated module of ethernet physical layer chips and optical modules, where the number of channels and channel rate can be expanded as required.

Fig. 9 is a cross-sectional view of a heterogeneous integrated silicon optical module structure 900 for interconnection of computer boards according to another embodiment of the present invention. Compared with the heterogeneous integrated silicon optical module structure 700 for interconnection of computer boards shown in fig. 7 and 8, the difference is that the TSV through hole 707 is not included, and the computer motherboard interface 909 is directly disposed on the end side of the carrier/carrier board 901 where the chip is located.

Fig. 10 is a cross-sectional view of a heterogeneous integrated silicon-based optoelectronic module structure 1000 for interconnection with a computer motherboard, according to an embodiment of the invention. On the basis of the structure shown in fig. 9, a scheme for connecting a silicon-based photon computing chip (SiPh) with an external optical signal is further shown. In one embodiment of the invention, the external optical signal and the silicon-based photonic computing chip (SiPh) are connected through a plurality of 25Gbps optical paths and then electrically connected with the driving chip and/or the amplifier chip through a plurality of 25Gbps high-speed lines, the driving chip and/or the amplifier chip are electrically connected with the physical layer serial-parallel conversion chip PHY/Serdes chip through a plurality of 25Gbps high-speed lines, and finally the physical layer serial-parallel conversion chip PHY/Serdes chip is connected with the computer motherboard through a plurality of 6.25Gbps lines.

The following describes a silicon-based optoelectronic heterogeneous integrated interconnection module structure according to the present invention with reference to fig. 11 and 12. FIG. 11 is a cross-sectional view of a silicon-based optoelectronic hetero-integrated interconnect module structure 1100 according to one embodiment of the present invention; FIG. 12 is a schematic top view of a silicon-based optoelectronic hetero-integrated interconnect module structure 1100 according to an embodiment of the present invention. The silicon-based optoelectronic heterogeneous integrated interconnection module structure 1100 further comprises a carrier 1110, a first amplifier chip (TIA)1120-1, a first driver chip (DRV)1120-2, a first silicon-based photonic computing chip (SiPh)1130, a first interconnection structure 1140, a second amplifier chip (TIA)1150-1, a second driver chip (DRV)1150-2, a second silicon-based photonic computing chip (SiPh)1160, a second interconnection structure 1170, and an optical interconnection 1180.

The carrier 1110 is the substrate of the silicon-based optoelectronic hetero-integrated interconnect module structure, and in one embodiment of the present invention, the carrier 1110 is a silicon wafer. In another embodiment of the present invention, the carrier 1110 may also be a glass carrier, a PCB substrate, or other materials. In other embodiments of the present invention, the carrier 1110 can also be ceramic or other carrier with good heat dissipation properties.

A first silicon-based photonic computing chip (SiPh)1130 is embedded in the carrier 1110, the silicon-based photonic computing chip 1130 including, but not limited to, integrated chips SiPh of active and passive devices such as silicon optical modulators, detectors, optical arrayed waveguide gratings, and the like. In one embodiment of the present invention, the silicon-based photonic computing chip (SiPh)1130 is mounted into the embedded slot by forming the embedded slot of the silicon-based photonic computing chip (SiPh)1130 in the carrier 1110 and then filling the slot bottom with solder/paste material. In yet another embodiment of the present invention, the silicon-based photonic computing chip (SiPh)1130 also includes optical receive/transmit device coupling regions and pads. In yet another embodiment of the present invention, to ensure that the coupling region of the optical receiving/transmitting device is not contaminated by the subsequent process, a photosensitive material with optical transparency, such as SU-8, can be selected for protection.

The first driver chip (DRV)1120-2 and the first amplifier chip (TIA)1120-1 are selected according to the performance of the first silicon-based photonic computing chip (SiPh)1130 of different specifications, and are also mounted in the carrier 1110. The thicknesses of the first driver chip (DRV)1120-2 and the first amplifier chip (TIA)1120-1 can be similar or different, and the first driver chip (DRV)1120-2 and the first amplifier chip (TIA)1120-1 are provided with chip bonding pads for realizing connection with the first silicon-based photon computing chip (SiPh) 1130. In one embodiment of the invention, the thickness of the first driver chip (DRV)1120-2 and the first amplifier chip (TIA)1120-1 is less than the thickness of the first silicon-based photon counting chip (SiPh) 1130.

A first driver chip (DRV)1120-2 and a first amplifier chip (TIA)1120-1 are electrically connected to a first silicon-based photonic computing chip (SiPh)1130 through a first interconnect structure 1140. In one embodiment of the present invention, the first interconnect structure 1140 is a wire bond formed by a wire bonding process. In yet another embodiment of the present invention, the first interconnection structure 1140 may also be formed by re-laying out a wiring layer.

The structure, function and arrangement of the second amplifier chip (TIA)1150-1, the second driver chip (DRV)1150-2, the second silicon-based photon counting chip (SiPh)1160 and the second interconnection structure 1170 are the same as those of the first amplifier chip (TIA)1120-1, the first driver chip (DRV)1120-2, the first silicon-based photon counting chip (SiPh)1130 and the first interconnection structure 1140, and thus, the description thereof is omitted.

The optical interconnect 1180 further includes a cladding layer 181 and a core layer 1182, and is formed after the surface waveguide definition is completed by coating a polymer material with optical transmission performance on the surface of the slide 1110 and further by a series of process flows such as photolithography and development, so that the optical interconnect between the first silicon-based photon computing chip (SiPh)1130 and the second silicon-based photon computing chip (SiPh)1160 can be realized.

In one embodiment of the present invention, the optical interconnect 1180 is formed of optical material,core layer 1182 may be selected from, but is not limited to, Dow

OE-4140 UV-Cured Optical Elastomer core layer material (higher refractive index); cladding 181 may alternatively be, but is not limited to Dow

OE-4141UV Cured Optical Elastomer cladding layer materials (lower refractive index) and companies such as NTT, Dow Corning, Hitachi Chemicals, etc. have organic materials that can be used to achieve Optical interconnections in different wavelength bands.

Another silicon-based optoelectronic heterogeneous integrated interconnection module structure of the present invention is described with reference to fig. 13 and 14. FIG. 13 is a cross-sectional view of a silicon-based optoelectronic hetero-integrated interconnect module structure 1300 according to yet another embodiment of the present invention; FIG. 14 is a schematic top view of a silicon-based optoelectronic heterogeneous integrated interconnect module structure 1300 according to an embodiment of the present invention. As shown in fig. 13 and 14, the difference between the silicon-based optoelectronic heterogeneous integrated interconnection module structure 1300 and the above silicon-based optoelectronic heterogeneous integrated interconnection module structure 1100 is that an optical access 1390 is added, so that the interconnection with external optical signals can be realized. In one embodiment of the present invention, while the optical interconnect 1380 is fabricated, a core layer material with a higher refractive index is defined as a columnar pattern, a cladding material with a lower refractive index is used as a confinement layer, the design size is matched with the mode field size of a single mode fiber, and after curing, the optical access of a chip can be realized.

According to the silicon-based optical computation heterogeneous integrated module provided by the invention, the chip embedding cavities with different depths are arranged in the slide glass through the processes of photoetching, etching and the like, and the silicon-based photon computation chips, the driver chips, the amplifier chips and the like with different thicknesses are arranged in the slide glass through the normally-installed patches to form the silicon-based optical computation heterogeneous integrated module. The silicon-based photon computing chip can be selected from a silicon-based modulator, a detector, an optical switch device and the like, can realize the functions of realizing optical signal interconnection and reconstructing related photon computing in the chip, and realizes the communication function by electric signals and replacing the original accelerator card, GPU and the like. After chips with different specifications are embedded, windowing is carried out on chip bonding pads and optical signal coupling areas of a silicon-based photon computing chip, a driver chip and an amplifier chip, in order to ensure that the optical coupling area is not contaminated by subsequent processes, an optically transparent photosensitive material can be selected to protect the optical signal coupling area, then a light source device or an optical signal transmission device can be pasted on the optical signal coupling area, and direct current power supply of a light source can be realized through the bonding pads arranged on a slide glass. The silicon-based optical computation heterogeneous integrated module can be a traditional 4-channel or 8-channel module, can also be expanded according to actual needs so as to meet heterogeneous integration of chips and large modules with multiple specifications, and has the advantages of fast heat dissipation, simplicity in assembly, stability, reliability and the like.

Claims

1. A silicon-based optical computation heterogeneous integrated module structure, comprising:

the chip embedding cavity is arranged at different depths in the slide;

the silicon-based optical chip is provided with a positive mounting patch which is embedded in the slide glass;

the electric chip is embedded in the slide glass, and the thickness of the silicon-based optical chip is greater than that of the electric chip;

a first electrical interconnect structure electrically connecting the silicon-based optical chip to the electrical chip;

the physical layer serial-parallel conversion chip is arranged in the slide glass in a positive mounting and surface mounting mode;

a second electrical interconnect structure electrically connecting the electrical chip to the physical layer serial-to-parallel conversion chip; and

and the computer mainboard interface is electrically connected to the physical layer serial-parallel conversion chip.

2. The silicon-based optical computing hetero-integrated module structure of claim 1, further comprising a first conductive through-silicon-via disposed in the carrier, the first conductive through-silicon-via having one end electrically connected to the physical layer serial-to-parallel conversion chip and another end electrically connected to the computer motherboard interface.

3. The silicon-based optical computation heterogeneous integrated module structure of claim 1, further comprising a heat dissipation structure and a second conductive through silicon via disposed under the silicon-based optical chip and/or the electrical chip and/or the physical layer serial-to-parallel conversion chip.

4. The silicon-based optical computation heterogeneous integrated module structure of claim 1, wherein the silicon-based optical chip is a silicon-based photonic computation chip, the silicon-based photonic computation chip being a silicon-based modulator and/or detector and/or optical switching device; the electric chip is a driver chip and/or an amplifier chip and/or a power management chip; the physical layer serial-parallel conversion chip is a chip for realizing the conversion function of parallel high-speed electrical interconnection signals and parallel low-speed electrical interconnection signals.

5. The silicon-based optical computing hetero-integrated module structure of claim 1, wherein the silicon-based optical chip further comprises an optical receiving/transmitting device coupling area, the optical receiving/transmitting device coupling area being provided with an optical receiving/transmitting device.