US20090245722A1 - Three-dimensional stacked optical device - Google Patents
Three-dimensional stacked optical device Download PDFInfo
- Publication number
- US20090245722A1 US20090245722A1 US12/355,081 US35508109A US2009245722A1 US 20090245722 A1 US20090245722 A1 US 20090245722A1 US 35508109 A US35508109 A US 35508109A US 2009245722 A1 US2009245722 A1 US 2009245722A1
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- Prior art keywords
- optical device
- vias
- electronic chip
- conductive member
- transparent substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/16—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
- H01L25/167—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/481—Internal lead connections, e.g. via connections, feedthrough structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- This invention relates to the art of electronic devices and, more particularly, to a method of forming a three-dimensional stacked optical device.
- optical interconnect components are rapidly growing in popularity in the electronics industry.
- the need for higher communication bandwidth in newer electronic components is driving technology away from electrical communication busses.
- Electrical communication busses cannot meet increasing bandwidth requirements, predicted to exceed terabyte/second rates, foreseen for newer generation electrical devices.
- One technology currently being explored to meet the higher communication bandwidths is optical communication systems.
- hundreds, up to more than a thousand, channels per processor module will be required to meet future communication needs.
- existing optical packaging solutions present a challenge regarding assembly, cost and density to achieve a high number of channels. More specifically, current optical devices working at a standard wavelength of 850 nm emit and receive light on a side also provided with electrical contacts. Operational surfaces and contact on the same side limit packaging density and communication speeds.
- a three-dimensional stacked optical device includes a transparent substrate, and at least one optical device having a main body mounted to the transparent substrate.
- the at least one optical device includes a plurality of vias that extend into the main body and do not extend into the transparent substrate.
- a conductive member is provided in each of the plurality of vias.
- the conductive member forms a backside contact at each of the plurality of vias.
- An electronic chip including a plurality of vias is mounted to the backside contacts on the optical device.
- Another conductive member is deposited in each of the plurality of vias formed in the electronic chip. The another conductive member forms additional backside contacts on the electronic chip.
- FIG. 1 illustrates an electronic device including optical devices constructed in accordance with exemplary embodiments of the present invention
- FIG. 2 illustrates the electronic device of FIG. 1 with the optical devices being thinned and embedded in an insulating material
- FIG. 3 illustrates the electronic device of FIG. 2 having a plurality of vias formed through the optical devices
- FIG. 4 is a detail view of one of the plurality of vias of FIG. 3 ;
- FIG. 5 illustrates the electronic device of FIG. 3 having an electronic component mounted to the optical devices through conductive material provided in the plurality of vias;
- FIG. 6 illustrates the electronic device of FIG. 5 having a plurality of vias formed in the electronic component
- FIG. 7 illustrates the electronic device of FIG. 6 having a plurality of contacts electrically coupled to conductive material provided in each of the plurality of vias formed in the electronic component to establish a three-dimensional stacked optical device in accordance with exemplary embodiments of the present invention.
- an electronic device constructed in accordance with exemplary embodiments of the present invention is generally indicated at 2 .
- electronic device 2 includes a transparent substrate 4 having a main body 6 including a first surface 8 that extends to a second surface 9 through an intermediate portion 10 .
- transparent includes both a clear or substantially clear material as well as openings or vias formed in a material, either transparent or opaque, that permit light to pass through the substrate.
- Electronic device 2 also includes a plurality of optical devices 20 - 23 , e.g., vertical cavity surface emitting laser (VCSEL) devices and photodiode (PD) devices, mounted to second surface 9 of substrate 4 .
- VCSEL vertical cavity surface emitting laser
- PD photodiode
- the type of optical device employed can vary in accordance with exemplary embodiments of the present invention.
- optical device 20 includes a main body 29 having a first surface 30 that extends to a second surface 31 through an intermediate portion 32 .
- Optical device 20 is mounted to second surface 9 of substrate 4 through a pair of mounting pads 33 and 34 .
- each optical device 20 - 23 is thinned, i.e., processed or planarized to have a thickness of less than 20 ⁇ m so as to be suitable for further processing.
- Insulating layer 50 is employed as a gap filling material for a subsequent planarizing process.
- Insulating layer 50 is planarized to form a main body 52 having a first surface 53 that abuts second surface 9 of substrate 4 and extends to a second substantially planar surface 54 through an intermediate section 55 .
- second surface 54 is made substantially planar and intermediate section 55 is made to have a substantially uniform thickness.
- a plurality of vias 70 - 77 are formed in optical devices 20 - 23 as shown in FIG. 3 .
- Vias 70 - 77 extend from second surface 54 of insulating layer 50 toward contact pad region (not separately labeled) of optical device 20 and into respective ones of optical devices 20 - 23 .
- Each via 70 - 77 includes a layer of isolating material 80 , such as shown in connection with via 77 in FIG. 4 , that electrically isolates each via 70 - 77 from a substrate (not separately labeled) of the corresponding optical device 20 - 23 .
- isolating material 80 could be omitted.
- each via 70 - 77 is provided with a corresponding conductive material member 82 - 89 , which, as will be discussed more fully below, creates a communication path through a backside, e.g., second surface 31 , of each optical device 20 - 23 .
- a plurality of backside contacts 100 - 107 are deposited on second surface 54 of insulating layer 50 and coupled with each conductive material member 82 - 89 .
- Backside contacts 100 - 107 provide an electrical interface for an electronic component shown in the form of a driver and amplifier chip 120 .
- Driver chip 120 includes a main body 122 having a first surface 124 that extends to a second surface 125 through an intermediate section 126 .
- first surface 124 is electrically coupled to backside contacts 100 - 107 and driver chip 120 is thinned or processed or planarized to a desired thickness that facilitates further processing. Once thinned to the desired thickness, driver chip 120 is embedded in an isolating layer 140 .
- Isolating layer 140 includes a main body 142 having a first surface 144 that extends to a second surface 145 through an intermediate portion 146 . In a manner similar to that described above, isolating layer 140 is planarized to facilitate further processing. At this point, a plurality of vias 150 - 160 are formed through second surface 145 and into driver chip 120 .
- a corresponding plurality of conductive material members 170 - 180 are deposited in respective ones of vias 150 - 160 .
- Conductive material members 170 - 180 provide a communication path between optical devices 20 - 23 , driver chip 120 and external components (not shown).
- a plurality of backside contacts 200 - 210 are coupled to each of conductive material members 170 - 180 as shown in FIG. 7 .
- a stacked, three-dimensional optical component is formed allowing optical or light rays, such as indicated at 300 , to pass through substrate 4 impinging upon optical devices 20 - 23 on one side while communication to external components passes from a second or backside of electronic device 2 .
- exemplary embodiments of the present invention provide an electronic component that is capable of communication speeds exceeding terabyte/second rates, while at the same time enabling the use of multiple components to provide sufficient channels of communication all while maintaining a minimal foot print.
Abstract
A three-dimensional stacked optical device includes a transparent substrate, and an optical device having a main body mounted to the transparent substrate. The optical device includes a plurality of vias that extend into the main body and do not extend into the transparent substrate. A conductive member is provided in each of the plurality of vias to form backside contacts. An electronic chip including a plurality of vias is mounted to the backside contacts on the optical device. Another conductive member is deposited in each of the plurality of vias formed in the electronic chip. The another conductive member forms additional backside contacts on the electronic chip.
Description
- This application is a continuation application of U.S. Ser. No. 12/054,754, entitled “Method of Forming a Three-Dimensional Stacked Optical Device”, filed on Mar. 25, 2008, the disclosure of which is incorporated by reference herein in its entirety.
- This invention relates to the art of electronic devices and, more particularly, to a method of forming a three-dimensional stacked optical device.
- Optical interconnect components are rapidly growing in popularity in the electronics industry. The need for higher communication bandwidth in newer electronic components is driving technology away from electrical communication busses. Electrical communication busses cannot meet increasing bandwidth requirements, predicted to exceed terabyte/second rates, foreseen for newer generation electrical devices. One technology currently being explored to meet the higher communication bandwidths is optical communication systems. However, even with the higher bandwidths afforded by optical communication systems, hundreds, up to more than a thousand, channels per processor module will be required to meet future communication needs. At present, existing optical packaging solutions present a challenge regarding assembly, cost and density to achieve a high number of channels. More specifically, current optical devices working at a standard wavelength of 850 nm emit and receive light on a side also provided with electrical contacts. Operational surfaces and contact on the same side limit packaging density and communication speeds.
- In accordance with an exemplary embodiment of the invention, a three-dimensional stacked optical device includes a transparent substrate, and at least one optical device having a main body mounted to the transparent substrate. The at least one optical device includes a plurality of vias that extend into the main body and do not extend into the transparent substrate. A conductive member is provided in each of the plurality of vias. The conductive member forms a backside contact at each of the plurality of vias. An electronic chip including a plurality of vias is mounted to the backside contacts on the optical device. Another conductive member is deposited in each of the plurality of vias formed in the electronic chip. The another conductive member forms additional backside contacts on the electronic chip.
- Additional features and advantages are realized through the techniques of exemplary embodiments of the present invention. Other embodiments and aspects of the invention are described in detail herein and are considered a part of the claimed invention. For a better understanding of the invention with advantages and features thereof, refer to the description and to the drawings.
- The subject matter which is regarded as the invention is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other objects, features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
-
FIG. 1 illustrates an electronic device including optical devices constructed in accordance with exemplary embodiments of the present invention; -
FIG. 2 illustrates the electronic device ofFIG. 1 with the optical devices being thinned and embedded in an insulating material; -
FIG. 3 illustrates the electronic device ofFIG. 2 having a plurality of vias formed through the optical devices; -
FIG. 4 is a detail view of one of the plurality of vias ofFIG. 3 ; -
FIG. 5 illustrates the electronic device ofFIG. 3 having an electronic component mounted to the optical devices through conductive material provided in the plurality of vias; -
FIG. 6 illustrates the electronic device ofFIG. 5 having a plurality of vias formed in the electronic component; and -
FIG. 7 illustrates the electronic device ofFIG. 6 having a plurality of contacts electrically coupled to conductive material provided in each of the plurality of vias formed in the electronic component to establish a three-dimensional stacked optical device in accordance with exemplary embodiments of the present invention. - The detailed description explains the exemplary embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
- With initial reference to
FIG. 1 , an electronic device constructed in accordance with exemplary embodiments of the present invention is generally indicated at 2. As shown,electronic device 2 includes atransparent substrate 4 having amain body 6 including afirst surface 8 that extends to asecond surface 9 through anintermediate portion 10. At this point it should be understood that the term “transparent” includes both a clear or substantially clear material as well as openings or vias formed in a material, either transparent or opaque, that permit light to pass through the substrate. -
Electronic device 2 also includes a plurality of optical devices 20-23, e.g., vertical cavity surface emitting laser (VCSEL) devices and photodiode (PD) devices, mounted tosecond surface 9 ofsubstrate 4. However, it should be understood that the type of optical device employed can vary in accordance with exemplary embodiments of the present invention. In any event, as each optical device 20-23 includes similar packaging, a detailed description will be made referencingoptical device 20 with an understanding that the remaining optical devices 21-23 include similar structure. As shown,optical device 20 includes amain body 29 having a first surface 30 that extends to asecond surface 31 through anintermediate portion 32.Optical device 20 is mounted tosecond surface 9 ofsubstrate 4 through a pair ofmounting pads 33 and 34. Once mounted tosubstrate 4, each optical device 20-23 is thinned, i.e., processed or planarized to have a thickness of less than 20 μm so as to be suitable for further processing. - As best shown in
FIG. 2 , once thinned to a desired thickness, optical devices 20-23 are embedded in aninsulating layer 50.Insulating layer 50 is employed as a gap filling material for a subsequent planarizing process.Insulating layer 50 is planarized to form amain body 52 having afirst surface 53 that abutssecond surface 9 ofsubstrate 4 and extends to a second substantiallyplanar surface 54 through anintermediate section 55. By being planarized, it should be understood that insulatinglayer 50 is processed such thatsecond surface 54 is made substantially planar andintermediate section 55 is made to have a substantially uniform thickness. - At this point, a plurality of vias 70-77 are formed in optical devices 20-23 as shown in
FIG. 3 . Vias 70-77 extend fromsecond surface 54 ofinsulating layer 50 toward contact pad region (not separately labeled) ofoptical device 20 and into respective ones of optical devices 20-23. Each via 70-77 includes a layer of isolating material 80, such as shown in connection with via 77 inFIG. 4 , that electrically isolates each via 70-77 from a substrate (not separately labeled) of the corresponding optical device 20-23. Of course if the substrate of the corresponding optical device is not electrically conductive, isolating material 80 could be omitted. In addition to isolating layer 80, each via 70-77 is provided with a corresponding conductive material member 82-89, which, as will be discussed more fully below, creates a communication path through a backside, e.g.,second surface 31, of each optical device 20-23. - As best shown in
FIG. 5 , a plurality of backside contacts 100-107 are deposited onsecond surface 54 ofinsulating layer 50 and coupled with each conductive material member 82-89. Backside contacts 100-107 provide an electrical interface for an electronic component shown in the form of a driver andamplifier chip 120.Driver chip 120 includes amain body 122 having afirst surface 124 that extends to asecond surface 125 through anintermediate section 126. As illustrated inFIG. 6 ,first surface 124 is electrically coupled to backside contacts 100-107 anddriver chip 120 is thinned or processed or planarized to a desired thickness that facilitates further processing. Once thinned to the desired thickness,driver chip 120 is embedded in an isolating layer 140. Isolating layer 140 includes amain body 142 having afirst surface 144 that extends to asecond surface 145 through anintermediate portion 146. In a manner similar to that described above, isolating layer 140 is planarized to facilitate further processing. At this point, a plurality of vias 150-160 are formed throughsecond surface 145 and intodriver chip 120. - A corresponding plurality of conductive material members 170-180 are deposited in respective ones of vias 150-160. Conductive material members 170-180 provide a communication path between optical devices 20-23,
driver chip 120 and external components (not shown). Towards that end, a plurality of backside contacts 200-210 are coupled to each of conductive material members 170-180 as shown inFIG. 7 . With this arrangement, a stacked, three-dimensional optical component is formed allowing optical or light rays, such as indicated at 300, to pass throughsubstrate 4 impinging upon optical devices 20-23 on one side while communication to external components passes from a second or backside ofelectronic device 2. In this manner, exemplary embodiments of the present invention provide an electronic component that is capable of communication speeds exceeding terabyte/second rates, while at the same time enabling the use of multiple components to provide sufficient channels of communication all while maintaining a minimal foot print. - While the preferred embodiment to the invention has been described, it will be understood that those skilled in the art, both now and in the future, may make various improvements and enhancements which fall within the scope of the claims which follow. These claims should be construed to maintain the proper protection for the invention first described.
Claims (3)
1. A three-dimensional stacked optical device comprising:
a transparent substrate;
at least one optical device having a main body mounted to the transparent substrate, the at least one optical device including a plurality of vias that extend into the main body, the plurality of vias do not extend into the transparent substrate;
a conductive member provided in each of the plurality of vias of the at least one optical device, the conductive member forming backside contacts on the at least one optical device;
an electronic chip including a plurality of vias mounted to the backside contacts on the optical device; and
another conductive member deposited in each of the plurality of vias formed in the electronic chip, the another conductive member forming additional backside contacts on the electronic chip.
2. The three-dimensional stacked optical device of claim 1 , wherein the at least one optical device is embedded in an insulating layer.
3. The three-dimensional stacked optical device of claim 1 , wherein the electronic chip is embedded in an isolating layer having an outer surface, the backside contacts deposited at each of the plurality of vias formed in the electronic chip rest upon the outer surface of the isolating layer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/355,081 US20090245722A1 (en) | 2008-03-25 | 2009-01-16 | Three-dimensional stacked optical device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/054,754 US7480426B1 (en) | 2008-03-25 | 2008-03-25 | Method of forming a three-dimensional stacked optical device |
US12/355,081 US20090245722A1 (en) | 2008-03-25 | 2009-01-16 | Three-dimensional stacked optical device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/054,754 Continuation US7480426B1 (en) | 2008-03-25 | 2008-03-25 | Method of forming a three-dimensional stacked optical device |
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US20090245722A1 true US20090245722A1 (en) | 2009-10-01 |
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US12/054,754 Active US7480426B1 (en) | 2008-03-25 | 2008-03-25 | Method of forming a three-dimensional stacked optical device |
US12/355,081 Abandoned US20090245722A1 (en) | 2008-03-25 | 2009-01-16 | Three-dimensional stacked optical device |
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US12/054,754 Active US7480426B1 (en) | 2008-03-25 | 2008-03-25 | Method of forming a three-dimensional stacked optical device |
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US8093711B2 (en) * | 2009-02-02 | 2012-01-10 | Infineon Technologies Ag | Semiconductor device |
US10025033B2 (en) | 2016-03-01 | 2018-07-17 | Advanced Semiconductor Engineering, Inc. | Optical fiber structure, optical communication apparatus and manufacturing process for manufacturing the same |
US10241264B2 (en) | 2016-07-01 | 2019-03-26 | Advanced Semiconductor Engineering, Inc. | Semiconductor device packages |
US10770440B2 (en) * | 2017-03-15 | 2020-09-08 | Globalfoundries Inc. | Micro-LED display assembly |
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- 2008-03-25 US US12/054,754 patent/US7480426B1/en active Active
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- 2009-01-16 US US12/355,081 patent/US20090245722A1/en not_active Abandoned
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US7480426B1 (en) | 2009-01-20 |
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