WO2011007703A1 - 光検出器 - Google Patents
光検出器 Download PDFInfo
- Publication number
- WO2011007703A1 WO2011007703A1 PCT/JP2010/061549 JP2010061549W WO2011007703A1 WO 2011007703 A1 WO2011007703 A1 WO 2011007703A1 JP 2010061549 W JP2010061549 W JP 2010061549W WO 2011007703 A1 WO2011007703 A1 WO 2011007703A1
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- WIPO (PCT)
- Prior art keywords
- substrate
- semiconductor element
- photodiode
- optical semiconductor
- photodetector
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- 239000000758 substrate Substances 0.000 claims abstract description 103
- 239000004065 semiconductor Substances 0.000 claims description 102
- 230000003287 optical effect Effects 0.000 claims description 55
- 238000006243 chemical reaction Methods 0.000 claims description 29
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 abstract description 55
- 238000009413 insulation Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000010931 gold Substances 0.000 description 9
- 238000007789 sealing Methods 0.000 description 9
- 229910000679 solder Inorganic materials 0.000 description 9
- 229910052581 Si3N4 Inorganic materials 0.000 description 7
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 7
- 238000000708 deep reactive-ion etching Methods 0.000 description 3
- 238000001039 wet etching Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- KXNLCSXBJCPWGL-UHFFFAOYSA-N [Ga].[As].[In] Chemical compound [Ga].[As].[In] KXNLCSXBJCPWGL-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/30—Measuring the intensity of spectral lines directly on the spectrum itself
- G01J3/36—Investigating two or more bands of a spectrum by separate detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0204—Compact construction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/04—Casings
- G01J5/041—Mountings in enclosures or in a particular environment
- G01J5/045—Sealings; Vacuum enclosures; Encapsulated packages; Wafer bonding structures; Getter arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
-
- 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
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/041—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L31/00
- H01L25/043—Stacked arrangements of devices
-
- 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
-
- 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
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1204—Optical Diode
- H01L2924/12043—Photo diode
Definitions
- the present invention relates to a photodetector for detecting energy lines in a first wavelength range and energy lines in a second wavelength range.
- a first optical semiconductor element for detecting an energy beam in the first wavelength region is provided on a second optical semiconductor device for detecting an energy beam in the second wavelength region.
- a photodetector is described in which the first photoelectric conversion unit of the first optical semiconductor element and the second photoelectric conversion unit of the second optical semiconductor element are arranged in parallel in the optical axis direction.
- the present invention provides a photodetector capable of realizing the proximity of the first photoelectric conversion unit and the second photoelectric conversion unit and hermetic sealing with respect to the second optical semiconductor element with a simple configuration.
- the task is to do.
- a photodetector for detecting an energy ray in a first wavelength region and an energy ray in a second wavelength region longer than the first wavelength region.
- a photodetector comprising a first semiconductor layer having a predetermined specific resistance, an insulating layer stacked on one main surface of the first semiconductor layer, and a main surface on one side of the insulating layer.
- the main film on the other side of the first semiconductor layer is covered so as to cover the electrically connected wiring film and the concave portion formed on the main surface on the other side of the first semiconductor layer and to ensure airtightness in the concave portion.
- a first optical semiconductor element disposed on the surface and electrically connected to the electrical passage, and disposed in the recess, the first optical semiconductor
- a second optical semiconductor element electrically connected to the element, wherein the first optical semiconductor element is provided on the first semiconductor substrate and on one side of the first semiconductor substrate, A first photoelectric conversion unit that generates an electric charge when energy rays in the wavelength region of the first semiconductor substrate are incident on the first semiconductor substrate from the other side
- the second optical semiconductor element is a second semiconductor Provided on the other side of the second semiconductor substrate so as to face the substrate and the first photoelectric conversion unit, and energy rays in the second wavelength region are incident on the second semiconductor substrate from the other side
- a second photoelectric conversion portion that sometimes generates electric charge.
- the first optical semiconductor element that covers the first semiconductor layer, the insulating layer, the second semiconductor layer, and the concave portion of the first semiconductor layer and secures airtightness in the concave portion
- the hermetic sealing package for the second optical semiconductor element disposed in the first and second optical semiconductor elements is configured, and the electric path portion and the wiring film of the first semiconductor layer are used to provide electrical power for the first optical semiconductor element and the second optical semiconductor element. Wiring has been achieved.
- the first photoelectric conversion unit of the first optical semiconductor element is provided on one side of the first semiconductor substrate, whereas the second photoelectric conversion unit of the second optical semiconductor element is the first photoelectric conversion unit. 2 on the other side of the semiconductor substrate. Therefore, according to this photodetector, the proximity of the first photoelectric conversion unit and the second photoelectric conversion unit and the hermetic sealing with respect to the second optical semiconductor element can be realized with a simple configuration.
- the second optical semiconductor element is electrically connected to the first optical semiconductor element by flip chip bonding. According to this configuration, the second optical semiconductor element can be reliably brought close to the first optical semiconductor element, and the first photoelectric conversion unit and the second photoelectric conversion unit can be accurately aligned. Therefore, the energy beam coupling efficiency can be improved in both the first optical semiconductor element and the second optical semiconductor element.
- the airtightness in the recess is ensured by airtightly bonding the electrode pad of the first optical semiconductor element to the electrode film provided on the other end face of the electric passage portion. According to this structure, the airtightness in a recessed part can be ensured using joining of an electrode film and an electrode pad.
- the wiring film is electrically connected to an end face on one side of the electric passage portion through a removal portion formed in the second semiconductor layer and a removal portion formed in the insulating layer. . According to this configuration, the electrical passage portion of the first semiconductor layer and the wiring film can be easily and reliably electrically connected.
- the second optical semiconductor element is preferably bonded to the bottom surface of the recess. According to this configuration, since the stability of the second optical semiconductor element in the recess is improved, the mechanical strength of the photodetector can be improved.
- the second optical semiconductor element is separated from the bottom surface of the recess. According to this configuration, since the dimensional accuracy of the thickness of the second optical semiconductor element and the depth of the recess with respect to the second optical semiconductor element is relaxed, the manufacture of the photodetector can be facilitated.
- the present invention it is possible to realize proximity between the first photoelectric conversion unit and the second photoelectric conversion unit and hermetic sealing with respect to the second optical semiconductor element.
- FIG. 1 is a cross-sectional view of a first embodiment of a photodetector according to the present invention.
- the photodetector 1 includes a rectangular plate-shaped SOI (Silicon On Insulator) substrate 2.
- the SOI substrate 2 includes a low-resistance Si (silicon) substrate (first semiconductor layer) 3, an insulating layer 4 that is an oxide film stacked on the back surface (main surface on one side) 3 b of the low-resistance Si substrate 3, And a high-resistance Si substrate (second semiconductor layer) 5 stacked on the back surface (main surface on one side) 4b of the insulating layer 4.
- the low resistance Si substrate 3 has a predetermined specific resistance (for example, a specific resistance of 0.01 ⁇ ⁇ cm), and the high resistance Si substrate 5 has a specific resistance (for example, a specific resistance) higher than the predetermined specific resistance. Resistance 1 k ⁇ ⁇ cm).
- a recess 6 having a rectangular cross section is formed on the surface (the other main surface) 3a of the low resistance Si substrate 3.
- the outer edge of the bottom surface 6 a of the recess 6 has a depth that reaches at least the insulating layer 4.
- the portion surrounding the recess 6 is an electric passage portion 8.
- An electrode film 9 made of a metal such as Au (gold) is provided on the end face 8 a on the surface side of the electrical passage portion 8.
- the electrode film 9 is formed on the end face 8a of the electric passage portion 8 by resistance heating, electron beam vapor deposition, sputtering, plating, or the like, and is ohmically connected to the electric passage portion 8.
- the removal portion 11 which is a notch having a depth corresponding to the thickness thereof, corresponds to the bottom surface 6 a of the recess 6 of the low-resistance Si substrate 3 and the electric passage portion 8 (that is, the thickness). In the direction).
- a conductive film 12 made of a metal such as Au is formed in each removal portion 11 and is ohmically connected to the electrical passage portion 8.
- the removal portion 13 has a depth from the back surface 5b of the high-resistance Si substrate 5 to the front surface 5a so that the bottom surface thereof becomes the back surface 4b of the insulating layer 4.
- the removal portion 13 penetrating the high-resistance Si substrate 5 spreads from the surface 5a of the high-resistance Si substrate 5 toward the back surface 5b (in other words, from the back surface 5b of the high-resistance Si substrate 5 toward the surface 5a. It is formed by wet etching or the like.
- a wiring film 15 made of a metal such as Au is provided on the back surface 5b of the high-resistance Si substrate 5 and the inner surface 13a of the removal portion 13 via an insulating film 14 that is an oxide film or a nitride film.
- the insulating film 14 is removed at the end portion on the surface side of the removal portion 13, and the wiring film 15 is connected to the conductive film 12 at the removed portion.
- the wiring film 15 is electrically connected to the end face 8b of the electric passage portion 8 of the low resistance Si substrate 3 through the removal portion 13 of the high resistance Si substrate 5 and the removal portion 11 of the insulating layer 4. become.
- the wiring film 15 provided on the back surface 5b of the high resistance Si substrate 5 is patterned so as to correspond to the wiring pattern of the mounting substrate (not shown).
- the photodetector 1 is mounted on the mounting substrate by bonding the wiring film 15 and the wiring pattern of the mounting substrate through the solder bumps 40.
- the Si photodiode 20 includes an n-type Si substrate (first semiconductor substrate) 21 and a p-type region 22 provided in a portion of the Si substrate 21 on the back surface 21b side.
- the Si photodiode 20 includes an insulating film 23 provided on the back surface 21b of the Si substrate 21 and an electrode pad electrically connected to the n-type Si substrate 21 serving as a cathode through a contact hole of the insulating film 23. 24, and an electrode pad 25 electrically connected to the p-type region 22 that is an anode through a contact hole of the insulating film 23.
- the electrode pads 24 and 25 are made of a metal such as Au.
- the p-type region 22 provided in the portion on the back surface 21 b side of the Si substrate 21 has energy rays in the first wavelength range (for example, 0.32 ⁇ m to 1.1 ⁇ m) with respect to the Si substrate 21.
- a first photoelectric conversion unit that generates charges when incident from the surface 21a is configured.
- the n-type and the p-type may be reversed in each semiconductor region of the Si photodiode 20.
- the Si photodiode 20 is electrically connected to the electric passage portion 8 of the low resistance Si substrate 3. More specifically, the electrode pad 24 of the Si photodiode 20 is airtightly bonded to the electrode film 9 provided on the end face 8a of the electric passage 8 by room temperature bonding. Thereby, airtightness in the recess 6 of the low resistance Si substrate 3 is ensured.
- a rectangular plate-shaped InGaAs (indium gallium arsenide) photodiode (second optical semiconductor element) 30 is disposed in the recess 6 formed in the surface 3 a of the low-resistance Si substrate 3.
- the InGaAs photodiode 30 includes an n-type InGaAs substrate (second semiconductor substrate) 31 and a p-type region 32 provided on the surface 31 a side of the InGaAs substrate 31.
- the InGaAs photodiode 30 includes an insulating film 33 provided on the surface 31 a of the InGaAs substrate 31 and an electrode pad electrically connected to the n-type InGaAs substrate 31 serving as a cathode through a contact hole of the insulating film 33.
- 34 and an electrode pad 35 electrically connected to the p-type region 32 which is an anode through a contact hole of the insulating film 33.
- the electrode pads 34 and 35 are made of a metal such as Au.
- the p-type region 32 provided in the portion on the surface 31a side of the InGaAs substrate 31 has a second wavelength region longer than the first wavelength region (for example, 1.1 ⁇ m to 1..
- a first photoelectric conversion unit that generates charges when an energy beam of 7 ⁇ m is incident on the InGaAs substrate 31 from the surface 31a is formed.
- the n-type and p-type may be reversed in each semiconductor region of the InGaAs photodiode 30.
- the InGaAs photodiode 30 originally has practical sensitivity from a wavelength of 0.9 ⁇ m to 1.7 ⁇ m, but light having a wavelength up to 1.1 ⁇ m is absorbed by the first optical semiconductor element. .
- the InGaAs photodiode 30 is electrically connected to the Si photodiode 20. More specifically, the electrode pad 34 of the InGaAs photodiode 30 is electrically connected to the electrode pad 25 of the Si photodiode 20 by flip chip bonding via the solder bump 16. The electrode pad 35 of the InGaAs photodiode 30 is electrically connected to the electrode pad 24 of the Si photodiode 20 by flip chip bonding via the solder bump 16. As a result, the p-type region 22 of the Si photodiode 20 and the p-type region 32 of the InGaAs photodiode 30 are aligned and face each other in the thickness direction.
- An electrode film 17 made of a metal such as Au is provided on the bottom surface 6a of the recess 6 of the low-resistance Si substrate 3, and the back surface 31b of the InGaAs substrate 31 of the InGaAs photodiode 30 is made of solder or conductive resin. Bonded to the electrode film 17.
- the cathode of the Si photodiode 20 and the anode of the InGaAs photodiode 30 are electrically connected, and are drawn out to the wiring film 15 as a common electrode through the electric passage portion 8. It is. Further, the anode of the Si photodiode 20 and the cathode of the InGaAs photodiode 30 are electrically connected, and are drawn out to the wiring film 15 as a common electrode through the bottom surface 6 a portion of the recess 6.
- Such wiring is adopted because it is not necessary to take out the signals of both photodiodes 20 and 30 simultaneously when the purpose is to widen the sensitivity wavelength range of the photodetector 1.
- the structure of the photodetector 1 can be simplified.
- the cathode of the Si photodiode 20 and the cathode of the InGaAs photodiode 30 are led out to the wiring film 15 as a common electrode, and the anode of the Si photodiode 20 and the anode of the InGaAs photodiode 30 are wired independently. It may be drawn out to the film 15, or all the anodes and cathodes may be drawn out to the wiring film 15 independently.
- the low-resistance Si substrate 3, the insulating layer 4, the high-resistance Si substrate 5, and the recess 6 of the low-resistance Si substrate 3 are covered and airtightness in the recess 6 is ensured.
- the Si photodiode 20 constitutes an airtight sealed package for the InGaAs photodiode 30 disposed in the recess 6.
- the Si passage 20 and the wiring film 15 of the low resistance Si substrate 3 constitute the Si photodiode 20 and the InGaAs. Electrical wiring to the photodiode 30 has been achieved.
- the p-type region 22 of the Si photodiode 20 is provided in the portion on the back surface 21b side of the Si substrate 21, whereas the p-type region 32 of the InGaAs photodiode 30 is provided in the portion on the surface 31a side of the InGaAs substrate 31. Is provided. Therefore, according to the photodetector 1, the proximity of the p-type region 22 and the p-type region 32 and hermetic sealing with respect to the InGaAs photodiode 30 can be realized with a simple configuration.
- the InGaAs photodiode 30 is electrically connected to the Si photodiode 20 by flip chip bonding. As a result, the InGaAs photodiode 30 can be reliably brought close to the Si photodiode 20 and the p-type region 22 and the p-type region 32 can be accurately aligned. It becomes possible to improve the coupling efficiency of lines.
- the electrode pad 24 of the Si photodiode 20 is airtightly bonded to the electrode film 9 provided on the end surface 8a on the surface side of the electric passage portion 8.
- the airtightness in the recess 6 can be ensured by utilizing the bonding between the electrode film 9 and the electrode pad 24.
- the wiring film 15 is connected to the end surface on the back surface side of the electric passage portion 8 of the low resistance Si substrate 3 through the removal portion 13 formed on the high resistance Si substrate 5 and the removal portion 11 formed on the insulating layer 4. 8b is electrically connected. Thereby, the electrical passage portion 8 and the wiring film 15 can be easily and reliably electrically connected.
- the InGaAs photodiode 30 is bonded to the bottom surface 6a of the recess 6. Thereby, since the stability of the InGaAs photodiode 30 in the recess 6 is improved, the mechanical strength of the photodetector 1 can be improved.
- an SOI substrate 2 is prepared. Then, a SiN (silicon nitride) film 51 is formed on the surface 3 a of the low resistance Si substrate 3 on the portion corresponding to the bottom surface 6 a of the recess 6, and on the surface 3 a of the low resistance Si substrate 3 on the portion corresponding to the electrical passage portion 8. An oxide film 52 is formed. Further, after a resist mask 53 is formed on the SiN film 51 and the oxide film 52, an annular groove 54 is formed in the low-resistance Si substrate 3 by DRIE (Deep Reactive Ion Etching), thereby defining the electric path portion 8.
- DRIE Deep Reactive Ion Etching
- an oxide film 52 is formed on the sidewall of the annular groove 54 by thermal oxidation.
- the SiN film 51 is removed by hot phosphoric acid
- the recess 6 is formed in the low resistance Si substrate 3 by DRIE.
- the oxide film 52 is removed by hydrogen fluoride. At this time, the portion corresponding to the outer edge portion of the bottom surface 6a of the recess 6 in the insulating layer 4 which is an oxide film is also removed.
- an SiN film 51 is formed on the end surface 8a of the electric passage portion 8, the bottom surface 6a of the recess 6, the back surface 5b of the high-resistance Si substrate 5, and the like by the CVD method.
- a portion corresponding to the removal portion 13 of the high resistance Si substrate 5 is removed.
- a removal portion 13 is formed on the high resistance Si substrate 5 by alkali wet etching.
- an insulating film 14 that is an oxide film is formed on the back surface 5b of the high-resistance Si substrate 5 and the inner surface 13a of the removal portion 13 by a CVD method. Form. And after forming a resist mask by spray coating, the removal part 11 is formed in the insulating layer 4 by dry etching. Subsequently, as shown in FIG. 5B, the end surface 8 a of the electric passage portion 8, the bottom surface 6 a of the recess 6, the removal portion 11 of the insulating layer 4, and the back surface 5 b and the removal portion 13 of the high resistance Si substrate 5. A metal film 55 is formed on the inner surface 13a and the like by vapor deposition of Au or the like.
- the metal film 55 is patterned by wet etching, and the electrode films 9, 17, the conductive film 12, and the wiring film 15 are formed. Then, the package body 7 is completed. Note that the metal film 55 may be patterned by lift-off.
- the InGaAs photodiode 30 is disposed in the recess 6 of the low resistance Si substrate 3.
- the back surface 31b of the InGaAs substrate 31 is joined to the electrode film 17 provided on the bottom surface 6a of the recess 6 by solder or conductive resin.
- solder bumps 16 are arranged at predetermined positions on the electrode pads 34 and 35 of the InGaAs photodiode 30.
- the Si photodiode 20 is disposed on the surface 3 a of the low resistance Si substrate 3 so as to cover the recess 6 of the low resistance Si substrate 3.
- the electrode pads 24, 25 of the Si photodiode 20 and the electrode pads 34, 35 of the InGaAs photodiode 30 are joined via the solder bumps 16, and the electrode film 9 provided on the end face 8 a of the electric passage portion 8.
- the electrode pad 24 of the Si photodiode 20 is bonded by room temperature bonding to complete the photodetector 1.
- FIG. 8 is a cross-sectional view of a second embodiment of the photodetector according to the present invention.
- the photodetector 10 has the above-described photodetector 1 in that the back surface 31 b of the InGaAs substrate 31 of the InGaAs photodiode 30 is separated from the bottom surface 6 a of the recess 6 of the low resistance Si substrate 3. And is mainly different.
- the photodetector 10 will be described focusing on the differences from the photodetector 1 described above.
- the low-resistance Si substrate 3 includes an electrical passage portion 18 that is electrically and physically separated from the electrical passage portion 8 by a groove.
- An electrode film 19 made of a metal such as Au is provided on the end face 18 a on the surface side of the electrical passage portion 18.
- the Si photodiode 20 is electrically connected to the electrical passage portions 8 and 18 of the low resistance Si substrate 3. More specifically, the electrode pad 24 of the Si photodiode 20 is airtightly bonded to the electrode film 9 provided on the end face 8a of the electric passage 8 by room temperature bonding. Further, the electrode pad 25 of the Si photodiode 20 is airtightly bonded to the electrode film 19 provided on the end face 18a of the electric passage portion 18 by room temperature bonding.
- the InGaAs photodiode 30 is electrically connected to the Si photodiode 20. More specifically, the electrode pad 34 of the InGaAs photodiode 30 is electrically connected to the electrode pad 25 of the Si photodiode 20 by flip chip bonding via the solder bump 16. The electrode pad 35 of the InGaAs photodiode 30 is electrically connected to the electrode pad 24 of the Si photodiode 20 by flip chip bonding via the solder bump 16.
- the cathode of the Si photodiode 20 and the anode of the InGaAs photodiode 30 are electrically connected, and are drawn out to the wiring film 15 as a common electrode through the electric passage portion 8. It is. Further, the anode of the Si photodiode 20 and the cathode of the InGaAs photodiode 30 are electrically connected, and are drawn out to the wiring film 15 as a common electrode through the electric passage portion 18.
- the back surface 31 b of the InGaAs substrate 31 of the InGaAs photodiode 30 is separated from the bottom surface 6 a of the recess 6 of the low resistance Si substrate 3.
- the InGaAs photodiode 30 is bonded to the Si photodiode 20 by flip chip bonding, the InGaAs photodiode 30 is housed in the recess 6 of the low resistance Si substrate 3, and the low resistance is achieved.
- Si photodiodes 20 are joined to the electrical passage portions 8 and 18 of the Si substrate 3.
- the present invention is not limited to the embodiment described above.
- the stacking of the insulating layer 4 on the back surface 3b of the low resistance Si substrate 3 and the stacking of the high resistance Si substrate 5 on the back surface 4b of the insulating layer 4 are not performed directly, but indirectly through some layer. May be.
- the present invention it is possible to realize proximity between the first photoelectric conversion unit and the second photoelectric conversion unit and hermetic sealing with respect to the second optical semiconductor element.
- Si photodiode (first optical semiconductor element) , 21... Si substrate (first semiconductor substrate), 22... P-type region (first photoelectric conversion unit), 24, 25... Electrode pad, 30.
- InGaAs photodiode (second optical semiconductor element), 31. InGaAs substrate (second semiconductor substrate), 32... P-type region (second photoelectric conversion unit).
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Abstract
Description
[第1の実施形態]
[第2の実施形態]
Claims (6)
- 第1の波長域のエネルギ線、及び前記第1の波長域よりも長波長側の第2の波長域のエネルギ線を検出するための光検出器であって、
所定の比抵抗を有する第1の半導体層と、
前記第1の半導体層の一方側の主面に積層された絶縁層と、
前記絶縁層の一方側の主面に積層され、前記所定の比抵抗よりも高い比抵抗を有する第2の半導体層と、
前記第2の半導体層の一方側の主面に絶縁膜を介して設けられ、前記第1の半導体層が含む電気通路部と電気的に接続された配線膜と、
前記第1の半導体層の他方側の主面に形成された凹部を覆うと共に前記凹部内の気密性を確保するように、前記第1の半導体層の他方側の主面上に配置され、前記電気通路部と電気的に接続された第1の光半導体素子と、
前記凹部内に配置され、前記第1の光半導体素子と電気的に接続された第2の光半導体素子と、を備え、
前記第1の光半導体素子は、
第1の半導体基板と、
前記第1の半導体基板の一方側の部分に設けられ、前記第1の波長域のエネルギ線が前記第1の半導体基板に対して他方側から入射したときに電荷を発生する第1の光電変換部と、を有し、
前記第2の光半導体素子は、
第2の半導体基板と、
前記第1の光電変換部と対向するように前記第2の半導体基板の他方側の部分に設けられ、前記第2の波長域のエネルギ線が前記第2の半導体基板に対して他方側から入射したときに電荷を発生する第2の光電変換部と、を有することを特徴とする光検出器。 - 前記第2の光半導体素子は、フリップチップボンディングによって前記第1の光半導体素子と電気的に接続されていることを特徴とする請求項1記載の光検出器。
- 前記凹部内の気密性は、前記電気通路部の他方側の端面に設けられた電極膜に前記第1の光半導体素子の電極パッドが気密に接合されることにより、確保されていることを特徴とする請求項1記載の光検出器。
- 前記配線膜は、前記第2の半導体層に形成された除去部、及び前記絶縁層に形成された除去部を介して、前記電気通路部の一方側の端面と電気的に接続されていることを特徴とする請求項1記載の光検出器。
- 前記第2の光半導体素子は、前記凹部の底面に接合されていることを特徴とする請求項1記載の光検出器。
- 前記第2の光半導体素子は、前記凹部の底面から離れていることを特徴とする請求項1記載の光検出器。
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CN102779824A (zh) * | 2011-05-10 | 2012-11-14 | 索尼公司 | 固体摄像器件和电子装置 |
EP3792983A4 (en) * | 2019-07-31 | 2021-03-31 | Kyoto Semiconductor Co., Ltd. | UNIT WITH LIGHT ABSORBING ELEMENTS |
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KR101765473B1 (ko) * | 2010-06-21 | 2017-08-24 | 삼성전자 주식회사 | 인쇄 회로 기판 및 이를 포함하는 반도체 패키지 |
JP6890857B2 (ja) * | 2019-07-31 | 2021-06-18 | 株式会社京都セミコンダクター | 受光素子ユニット |
US11610927B2 (en) * | 2020-02-27 | 2023-03-21 | Taiwan Semiconductor Manufacturing Company, Ltd. | Capping structure along image sensor element to mitigate damage to active layer |
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JPH0318069A (ja) * | 1989-06-14 | 1991-01-25 | Matsushita Electron Corp | 半導体受光装置 |
WO2000062344A1 (fr) * | 1999-04-13 | 2000-10-19 | Hamamatsu Photonics K.K. | Dispositif à semiconducteur |
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Cited By (5)
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CN102779824A (zh) * | 2011-05-10 | 2012-11-14 | 索尼公司 | 固体摄像器件和电子装置 |
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CN106847842A (zh) * | 2011-05-10 | 2017-06-13 | 索尼半导体解决方案公司 | 摄像器件和电子装置 |
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EP3792983A4 (en) * | 2019-07-31 | 2021-03-31 | Kyoto Semiconductor Co., Ltd. | UNIT WITH LIGHT ABSORBING ELEMENTS |
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EP2455983A4 (en) | 2017-05-10 |
CN102473790B (zh) | 2014-08-27 |
TWI502725B (zh) | 2015-10-01 |
EP2455983B1 (en) | 2017-10-11 |
US8564036B2 (en) | 2013-10-22 |
JP5208871B2 (ja) | 2013-06-12 |
JP2011023400A (ja) | 2011-02-03 |
TW201115715A (en) | 2011-05-01 |
EP2455983A1 (en) | 2012-05-23 |
US20120187517A1 (en) | 2012-07-26 |
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