WO2011162346A1 - 赤外線センサ - Google Patents
赤外線センサ Download PDFInfo
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- WO2011162346A1 WO2011162346A1 PCT/JP2011/064435 JP2011064435W WO2011162346A1 WO 2011162346 A1 WO2011162346 A1 WO 2011162346A1 JP 2011064435 W JP2011064435 W JP 2011064435W WO 2011162346 A1 WO2011162346 A1 WO 2011162346A1
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- infrared sensor
- chip
- sensor chip
- infrared
- plate portion
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Classifications
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- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/20—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices
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Definitions
- the present invention relates to an infrared sensor.
- an infrared sensor chip in which a plurality of pixel portions having temperature sensing portions made of thermopile are arranged in an array on one surface side of a silicon substrate, and an IC chip for processing an output signal of the infrared sensor chip
- An infrared sensor infrared sensor module
- an infrared sensor chip including an infrared sensor chip and a package containing an IC chip has been proposed (see, for example, Japanese Patent Laid-Open Publication No. 2010-78451).
- the above-mentioned package comprises a package body in which an infrared sensor chip and an IC chip are mounted side by side, and a package lid covered on the package body so as to surround the infrared sensor chip and the IC chip between the package body and the package body. It is done.
- the package lid is provided with a lens for converging infrared rays to be detected by the infrared sensor chip.
- the package lid has a function of transmitting the infrared light to be detected by the infrared sensor chip.
- a thermal infrared detection unit having a temperature sensing unit in each pixel unit is formed on the one surface side of the silicon substrate and supported by the silicon substrate. Further, in the infrared sensor chip, a hollow portion is formed immediately below a part of the thermal infrared detection unit on the silicon substrate. Further, in the infrared sensor chip, the hot junction of the thermopile constituting the temperature sensing portion is formed in a region overlapping the cavity in the thermal infrared detector, and the cold junction does not overlap the cavity in the thermal infrared detector. It is formed in the area. In the infrared sensor chip, a MOS transistor which is a switching element for selecting a pixel portion is formed in each pixel portion on the one surface side of the silicon substrate.
- the infrared sensor chip and the IC chip are housed in one package, and the wiring between the infrared sensor chip and the IC chip can be shortened, so the influence of external noise can be reduced and noise resistance is achieved. I can improve the nature.
- the output signal (output voltage) of each pixel unit of the infrared sensor chip includes an offset voltage caused by the heat generation of the IC chip, and the S / N ratio between each pixel unit Will be scattered.
- the S / N ratio varies in the plane of the infrared sensor chip.
- the heat transferred from the IC chip to the silicon substrate of the infrared sensor chip along the path passing through the package body mainly raises the temperature of the cold junction, which causes a negative offset voltage.
- the heat transferred to the infrared sensor chip by heat conduction or heat radiation through the medium (for example, nitrogen gas etc.) from the IC chip through the medium (eg, nitrogen gas etc.) mainly raises the temperature of the hot junction. It becomes a factor to generate.
- the present invention has been made in view of the above, and an object thereof is to provide an infrared sensor capable of suppressing the S / N ratio variation in the plane of the infrared sensor chip due to the heat generation of the IC chip. It is to provide.
- the infrared sensor comprises an infrared sensor chip in which a plurality of pixel parts having temperature sensing parts constituted by a thermopile are arranged in an array on one surface side of a semiconductor substrate, and an output signal of the infrared sensor chip An IC chip to be processed, and a package containing the infrared sensor chip and the IC chip, wherein the package is a package body on which the infrared sensor chip and the IC chip are mounted side by side, and the infrared sensor chip A package lid airtightly coupled to the package body in a form surrounding the infrared sensor chip and the IC chip, having a function of transmitting the infrared rays to be detected, and the package body; Has a window hole through which infrared light passes to the infrared sensor chip. Characterized in that said comprising a cover member for uniformizing the temperature variation of the hot junction and cold junction of the pixel units corresponding to the heat generation.
- the cover member is a front plate portion located in front of the infrared sensor chip and formed with the window hole, and extended rearward from the outer peripheral edge of the front plate portion, and the IC chip and the infrared ray It is preferable that a side plate portion joined to the package body with the sensor chip be configured.
- the package main body retracts the surface of the second area on which the IC chip is mounted relative to the surface of the first area on which the infrared sensor chip is mounted, and the cover member is A front plate portion located in front of the infrared sensor chip and in which the window hole is formed, and extending backward from the outer peripheral edge of the front plate portion along the direction in which the infrared sensor chip and the IC chip are juxtaposed
- the infrared sensor is provided with two side plate portions which are located on both sides of the both sides of the infrared sensor chip and are joined to the package body, and the front plate portion is in the projection area of the outer peripheral line of the front plate portion. It is preferable that the chip and the IC chip be formed to fit therein.
- the window hole of the front plate portion is rectangular, and an inner peripheral line of the window hole on the IC chip side in a plan view is on the IC chip side of the infrared sensor chip. It is preferable to be on the side of the IC chip than the outer peripheral line.
- the cover member is a front plate portion positioned in front of the infrared sensor chip and formed with the window hole, and a side plate portion extending backward from the front plate portion and joined to the package main body And preferably.
- the cover member is disposed in proximity to both the infrared sensor chip and the IC chip.
- the front plate portion is formed in a size in which at least the infrared sensor chip fits within a projection area of an outer peripheral line of the front plate portion.
- the cover member is preferably formed of a conductive material.
- the cover member is joined to the package body by a conductive material.
- the package body preferably includes a base made of an insulating material and an electromagnetic shield layer made of a metal material.
- the present invention can suppress variations in S / N ratio in the plane of the infrared sensor chip due to the heat generation of the IC chip.
- FIG. 1A is a partially broken schematic perspective view
- FIG. 1B is a schematic perspective view with a package lid removed
- FIG. 1C is a schematic side view with a package lid removed
- FIG. 1D is a schematic side view with the package lid removed.
- FIG. 1E is a schematic cross-sectional view of an essential part of the infrared sensor chip. It is a plane layout figure of the infrared sensor chip in the same as the above. It is the plane layout figure of the pixel part of the infrared sensor chip in the same as the above. It is the plane layout figure of the pixel part of the infrared sensor chip in the same as the above. The principal part of the pixel part of the infrared sensor chip in the same as the above is shown, FIG.
- FIG. 5A is a planar layout figure
- FIG. 5B is a schematic sectional drawing corresponding to the D-D 'cross section of FIG. 5A. It is the plane layout figure of the principal part of the pixel part of the infrared sensor chip in the same as above. It is the plane layout figure of the principal part of the pixel part of the infrared sensor chip in the same as above. It is the plane layout figure of the principal part of the pixel part of the infrared sensor chip in the same as above.
- FIG. 8A is a plan layout view
- FIG. 8B is a schematic cross-sectional view corresponding to the D-D 'cross-section of FIG. The principal part containing the cold junction of the infrared sensor chip in the same as the above is shown
- FIG. 9A is a plane layout figure
- FIG. 9B is a schematic sectional drawing.
- FIG. 10A is a plan layout view
- FIG. 10B is a schematic cross-sectional view of the main part including the hot junction of the infrared sensor chip in the above. It is a schematic sectional drawing of the principal part of the pixel part of the infrared sensor chip in the same as the above. It is a schematic sectional drawing of the principal part of the pixel part of the infrared sensor chip in the same as the above.
- FIG. 13A and FIG. 13B are diagrams for explaining the main part of the infrared sensor chip in the above. It is an equivalent circuit schematic of the infrared sensor chip in the same as the above.
- 15A and 15B are main process cross-sectional views for describing the method for manufacturing an infrared sensor according to the same as above.
- FIG. 16A and 16B are main process cross-sectional views for explaining the method of manufacturing an infrared sensor according to the same.
- 17A and 17B are main process cross-sectional views for describing the method for manufacturing the infrared sensor of the above.
- 18A and 18B are main process cross-sectional views for explaining the method of manufacturing an infrared sensor according to the same.
- 19A is a partially broken schematic perspective view
- FIG. 19B is a schematic perspective view with the package lid removed
- FIG. 19C is a schematic side view with the package lid removed
- FIG. 19E is a schematic cross-sectional view of an essential part of the infrared sensor chip.
- FIG. 20A is a partially broken schematic perspective view
- FIG. 20A is a partially broken schematic perspective view
- FIG. 20A is a partially broken schematic perspective view
- FIG. 20B is a schematic perspective view with the package lid removed
- FIG. 20C is a schematic side view with the package lid removed
- FIG. 20D is the infrared sensor of the third embodiment.
- FIG. 20E is a schematic cross-sectional view of an essential part of the infrared sensor chip.
- 21A is a partially broken schematic perspective view
- FIG. 21B is a schematic perspective view with the package lid removed
- FIG. 21C is a schematic side view with the package lid removed
- FIG. 21E is a schematic cross-sectional view of an essential part of the infrared sensor chip.
- the infrared sensor includes an infrared sensor chip 100, an IC chip 102 for processing an output signal of the infrared sensor chip 100, and a package 103 in which the infrared sensor chip 100 and the IC chip 102 are accommodated. .
- the infrared sensor also has a thermistor 101 for measuring an absolute temperature housed in the package 103.
- thermopile 30a is formed on one surface side (front side) of a semiconductor substrate 1 made of a silicon substrate.
- the package 103 is formed on the package body 104 so as to surround the infrared sensor chip 100, the IC chip 102 and the thermistor 101 between the package body 104 on which the infrared sensor chip 100 and the IC chip 102 and the thermistor 101 are mounted and the package body 104. And a package lid 105 airtightly bonded.
- the package body 104 has an IC chip 102 and an infrared sensor chip 100 mounted side by side.
- the infrared sensor chip 100 and the thermistor 101 are mounted side by side in a direction orthogonal to the direction in which the IC chip 102 and the infrared sensor chip 100 are juxtaposed.
- the package lid 105 has a function and conductivity for transmitting the infrared ray to be detected by the infrared sensor chip 100.
- the package lid 105 is a lens for closing the metal cap 152 attached to the one surface side (front side) of the package body 104 and the opening window 152 a formed in the portion of the metal cap 152 corresponding to the infrared sensor chip 100. And 153.
- the lens 153 has a function of transmitting the infrared light and a function of converging the infrared light to the infrared sensor chip 100.
- a cover member 106 is provided in the package 103 to make uniform the temperature change amount of the hot junction T1 and the cold junction T2 of each pixel unit 2 according to the heat generation of the IC chip 102.
- the cover member 106 has a window 108 through which infrared light passes to the infrared sensor chip 100. That is, in each pixel unit 2, due to the heat generation of the IC chip 102, a temperature difference ⁇ T may occur between the hot contact T1 and the cold contact T2.
- the variation in the temperature difference ⁇ T (the temperature difference ⁇ T between the hot junction T1 and the cold junction T2 caused by the heat generation of the IC chip 102) between the pixel portions 2 can be obtained. , Can be small.
- a cover member 106 for equalizing the amount of temperature change of the hot junction T1 and the cold junction T2 of each pixel unit 2 according to the heat generation of the IC chip 102 is optional.
- the cover member 106 is a front plate portion 107 positioned in front of the infrared sensor chip 100 and having a window hole 108 formed therein, and a side plate portion extended rearward from the front plate portion and joined to the package main body 104 And 109 are provided.
- the cover member 106 is disposed close to both the infrared sensor chip 100 and the IC chip 102.
- a plurality of pixel units 2 having a thermal infrared detection unit 3 and a MOS transistor 4 which is a switching element for pixel selection are arrayed on the one surface side of the semiconductor substrate 1 (here, two dimensional Arrayed (see FIG. 2).
- m ⁇ n (8 ⁇ 8 in the example shown in FIG. 2) pixel units 2 are formed on the one surface side of one semiconductor substrate 1, but the number of pixel units 2 is not limited. And the arrangement is not particularly limited.
- the temperature sensing unit 30 of the thermal infrared detection unit 3 is configured by connecting a plurality (six in this case) of thermopiles 30a (see FIG. 3) in series.
- the equivalent circuit of the temperature sensing unit 30 in the thermal infrared detection unit 3 is represented by a voltage source corresponding to the thermoelectromotive force of the temperature sensing unit 30.
- one end of the temperature sensitive portion 30 of the plurality of thermal type infrared detectors 3 in each row is connected to each row via the above-mentioned MOS transistor 4.
- a plurality of vertical readout lines 7 commonly connected to each other and a plurality of horizontal signal lines commonly connected to each row of gate electrodes 46 of the MOS transistors 4 corresponding to the temperature sensitive portions 30 of the thermal infrared detection unit 3 of each row It is equipped with six.
- the infrared sensor chip 100 In the infrared sensor chip 100, a plurality of ground lines 8 in which the p + -type well regions 41 of the MOS transistors 4 in each column are connected in common for each column and a common ground line 9 in which each ground line 8 is connected in common And have. Furthermore, the infrared sensor chip 100 includes a plurality of reference bias lines 5 in which the other ends of the temperature sensing units 30 of the plurality of thermal infrared detection units 3 in each row are commonly connected to each row. Thus, the infrared sensor chip 100 can read out the outputs of the temperature sensing units 30 of all the thermal infrared detection units 3 in time series.
- the infrared sensor chip 100 is a MOS transistor for reading out the output of the thermal infrared detection unit 3 and arranged in parallel to the thermal infrared detection unit 3 and the thermal infrared detection unit 3 on the one surface side of the semiconductor substrate 1 A plurality of pixel portions 2 having 4 and 5 are formed.
- each horizontal signal line 6 is electrically connected to each pixel selection pad Vsel
- each reference bias line 5 is commonly connected to the common reference bias line 5 a
- each vertical readout line 7 is individually connected.
- the common ground line 9 is electrically connected to the ground pad Gnd
- the common reference bias line 5a is electrically connected to the reference bias pad Vref
- the semiconductor substrate 1 is a substrate pad Vdd Are connected electrically.
- the output voltage of each pixel unit 2 can be read out sequentially.
- the potential of the reference bias pad Vref is 1.65 V
- the potential of the ground pad Gnd is 0 V
- the potential of the substrate pad Vdd is 5 V
- the potential of the specific pixel selection pad Vsel is 5 V.
- the MOS transistor 4 When the potential of the pixel selection pad Vsel is 0 V, the MOS transistor 4 is turned off, and the output voltage of the pixel unit 2 is not read out from the output pad Vout.
- the pad Vsel for pixel selection, the pad Vref for reference bias, the pad Gnd for ground, the pad Vout for output and the like in FIG. 14 are all illustrated as the pad 80 without distinction.
- thermal infrared detector 3 and the MOS transistor 4 will be described below.
- the above-described semiconductor substrate 1 a single crystal silicon substrate of n-type conductivity and having the (100) surface is used.
- the thermal infrared detection unit 3 of each pixel unit 2 is formed in the formation area A1 (see FIG. 5) of the thermal infrared detection unit 3 on the one surface side of the semiconductor substrate 1. Further, the MOS transistor 4 of each pixel unit 2 is formed in the formation region A2 (see FIG. 5) of the MOS transistor 4 on the one surface side of the semiconductor substrate 1.
- a hollow portion 11 is formed immediately below a portion of each thermal infrared detection unit 3 on the one surface side of the semiconductor substrate 1.
- the thermal infrared detection unit 3 includes a support 3 d formed on the periphery of the cavity 11 on the one surface side of the semiconductor substrate 1 and a cavity 11 covered in plan view on the one surface of the semiconductor substrate 1.
- a thin film structure 3a includes an infrared ray absorbing portion 33 that absorbs infrared rays.
- the first thin film structure portion 3a is a plurality of second thin film structures arranged in parallel along the circumferential direction (horizontal direction with respect to the paper surface in FIG.
- the first thin film structure portion 3 a is separated into six second thin film structure portions 3 aa by providing a plurality of linear slits 13.
- part divided corresponding to each 2nd thin film structure part 3aa among the infrared rays absorption parts 33 is called the 2nd infrared rays absorption part 33a.
- the thermal infrared detection unit 3 is provided with a thermopile 30a for each second thin film structure 3aa.
- the warm contact point T1 is provided in the second thin film structure portion 3aa
- the cold contact point T2 is provided in the support portion 3d.
- the hot junction T1 is formed in the first region overlapping the cavity 11 in the thermal infrared detector 3
- the cold junction T2 is in the second region not overlapping the cavity 11 in the thermal infrared detector 3. It is formed.
- the infrared sensor chip 100 includes the plurality of pixel units 2.
- the pixel unit 2 includes a thermal infrared detection unit 3 formed on the one surface side (front side) of the semiconductor substrate 1.
- the heat side infrared detection unit 3 includes a temperature sensing unit 30.
- a cavity 11 is formed in a portion corresponding to a part of the thermal infrared detection unit 3 on the one surface side of the semiconductor substrate 1.
- the hot junction T1 of the temperature sensing unit 30 is formed in a first region overlapping the cavity 11 in the thermal infrared detection unit 3, and the cold junction T2 of the temperature sensing unit 30 is a cavity in the thermal infrared detection unit 3. It is formed in the second region not overlapping the portion 11.
- thermopiles 30a are electrically connected in a connection relationship in which the output change with respect to the temperature change is large as compared with the case where the output is taken out for each thermopile 30a.
- the temperature sensing unit 30 has six thermopiles 30a connected in series.
- the connection relation described above is not limited to the connection relation in which all of the plurality of thermopiles 30 a are connected in series.
- sensitivity can be enhanced as compared to the case where six thermopiles 30a are connected in parallel or the case where the output is taken out for each thermopile 30a.
- the electric resistance of the temperature sensing portion 30 can be lowered and the thermal noise is reduced, so that the S / N ratio is improved.
- each second thin film structure unit 3aa two planar rectangular strip portions 3bb and 3bb that connect the support unit 3d and the second infrared absorption unit 33a are hollow. They are spaced apart in the circumferential direction of the portion 11. That is, each of the second thin film structure portions 3aa includes the second infrared ray absorbing portion 33a and the two bridge portions 3bb and 3bb. As a result, a C-shaped slit 14 in plan view is formed, which spatially separates the two bridge portions 3bb and 3bb from the second infrared ray absorbing portion 33a and communicates with the hollow portion 11.
- a support 3d which is a portion surrounding the first thin film structure 3a in a plan view, has a rectangular frame shape.
- the portions other than the connection portions with the second infrared absorption portion 33a and the support portion 3d by the slits 13 and 14 described above are the space between the second infrared absorption portion 33a and the support portion 3d and the space Are separated.
- the dimension of the second thin film structure portion 3aa in the extension direction from the support portion 3d is 93 ⁇ m
- the dimension in the width direction orthogonal to the extension direction is 75 ⁇ m
- the width dimension of each bridge portion 3bb is 23 ⁇ m
- each slit Although the width of 13 and 14 is set to 5 ⁇ m, these values are an example and are not particularly limited.
- the first thin film structure portion 3 a includes the silicon oxide film 1 b formed on the one surface side of the semiconductor substrate 1, the silicon nitride film 32 formed on the silicon oxide film 1 b, and the silicon nitride film 32.
- the interlayer insulating film 50 is formed of a BPSG film
- the passivation film 60 is formed of a laminated film of a PSG film and an NSG film formed on the PSG film, but not limited to this, for example, silicon nitride You may comprise by a film.
- a portion other than the bridge portions 3bb and 3bb of the first thin film structure portion 3a constitutes a first infrared absorption unit 33.
- the supporting portion 3 d is formed of a silicon oxide film 1 b, a silicon nitride film 32, an interlayer insulating film 50 and a passivation film 60.
- the laminated film of the interlayer insulating film 50 and the passivation film 60 is formed on the one surface side of the semiconductor substrate 1 for forming the region A1 for forming the thermal infrared detecting portion 3 and the MOS transistor 4.
- a portion of the laminated film formed in the formation region A1 of the thermal infrared detection unit 3 also serves as the infrared absorption film 70 (see FIG. 5B).
- the refractive index of the infrared absorbing film 70 is n 2 and the central wavelength of the infrared light to be detected is ⁇
- the thickness t 2 of the infrared absorbing film 70 is set to ⁇ / 4n 2.
- the absorption efficiency of infrared light of the target wavelength (for example, 8 to 12 ⁇ m) can be enhanced, and high sensitivity can be achieved.
- the film thickness of the interlayer insulating film 50 is 0.8 ⁇ m
- the film thickness of the passivation film 60 is 1 ⁇ m (the film thickness of the PSG film is 0.5 ⁇ m, the film thickness of the NSG film is 0.5 ⁇ m). .
- the inner peripheral shape of the hollow portion 11 is rectangular, and the connection piece 3c is formed in an X shape in plan view, and the extension direction of the second thin film structure portion 3aa (support portion The second thin film structure portions 3aa and 3aa adjacent to each other in the diagonal direction intersecting the extension direction from 3d), and the second thin film structure portions 3aa and 3aa adjacent to each other in the extension direction of the second thin film structure portion 3aa.
- the second thin film structure portions 3aa and 3aa adjacent to each other in the direction orthogonal to the extension direction of the thin film structure portion 3aa of 2 are connected.
- the thermopile 30a is configured such that one end portions of an n-type polysilicon layer 34 and a p-type polysilicon layer 35 formed on the silicon nitride film 32 across the second thin film structure portion 3aa and the support portion 3d In the example shown in FIG. 3, each of the plurality is electrically connected by the connection portion (first connection portion) 36 made of a metal material (for example, Al-Si or the like) on the infrared incident side of the infrared absorption portion 33a.
- the thermopile 30a has nine thermocouples). That is, in the present embodiment, the first end of the n-type polysilicon layer 34 and the first end of the p-type polysilicon layer 35 are electrically connected by the connection portion 36.
- thermopile 30 a includes the other end (the second end of the n-type polysilicon layer 34) and the p-type polysilicon of the n-type polysilicon layer 34 of the thermocouple adjacent to each other on the one surface side of the semiconductor substrate 1.
- the other end (the second end of the p-type polysilicon layer 35) of the layer 35 is joined by a connection (second connection) 37 made of a metal material (for example, Al-Si etc.) and electrically connected It is done.
- the thermopile 30a forms a hot junction T1 by the one end of the n-type polysilicon layer 34, the one end of the p-type polysilicon layer 35, and the connection portion 36.
- a cold junction T2 is formed by the other end of the n-type polysilicon layer 34, the other end of the p-type polysilicon layer 35, and the connection portion 37.
- each hot junction T1 of the thermopile 30a is formed in a region overlapping the cavity 11 in the thermal infrared detector 3
- each cold junction T2 is formed in a region not overlapping the cavity 11 in the thermal infrared detector 3. It is done.
- the portions formed in the bridge portions 3bb and 3bb described above and the semiconductor substrate 1 A portion formed on the silicon nitride film 32 on the one surface side of the above can also absorb infrared rays.
- the temperature sensing unit 30 has at least one thermocouple comprising the n-type polysilicon layer 34 and the p-type polysilicon layer 35.
- the hot junction T1 of the thermocouple is formed in a first region overlapping the cavity 11 in the thermal infrared detector 3.
- the cold junction T2 of the thermocouple is heavy on the cavity 11 in the thermal infrared detector 3. Is formed in the second region.
- the hollow portion 11 has a quadrangular pyramid shape, and the depth dimension of the central portion in plan view is larger than that of the peripheral portion, so the first thin film structure portion
- the planar layout of the thermopile 30a in each pixel section 2 is designed such that the hot junction T1 gathers in the central portion of 3a. That is, in the middle two second thin film structural parts 3aa in the vertical direction in FIG. 3, as shown in FIGS. 3 and 6, the arrangement direction of the three second thin film structural parts 3aa (vertical direction in FIG. While the hot junctions T1 are arranged side by side, while the upper two second thin film structural portions 3aa in the vertical direction are three second thin films as shown in FIGS.
- the hot junctions T1 are concentratedly arranged on the side (lower side in FIG. 3) closer to the second thin film structure portion 3aa in the middle in the arrangement direction of the structure portions 3aa, and the two lower side in the vertical direction In the thin film structure 3aa of 2, as shown in FIG. 3, the hot junction is on the side (upper side in FIG. 3) closer to the middle second thin film structure 3aa in the juxtaposition direction of the three second thin film structures 3aa.
- T1 is arranged intensively.
- the arrangement of the plurality of hot junctions T1 of the upper and lower second thin film structures 3aa in the vertical direction in FIG. 3 is the second thin film structure 3aa in the middle.
- the predetermined depth dp is set to 200 ⁇ m, but this value is an example, There is no particular limitation.
- the second thin film structure portion 3aa is an n-type that suppresses warpage of the second thin film structure portion 3aa and absorbs infrared light in a region where the thermopile 30a is not formed on the infrared light incident surface side of the silicon nitride film 32.
- An infrared absorbing layer 39 (see FIGS. 1, 3, 5 and 11) made of a polysilicon layer is formed.
- a reinforcement layer 39b (see FIG. 8) formed of an n-type polysilicon layer for reinforcing the connection piece 3c is provided on the connection piece 3c for connecting the adjacent second thin film structure portions 3aa and 3aa to each other. .
- the reinforcing layer 39 b is continuously and integrally formed with the infrared absorbing layer 39.
- the connecting piece 3c is reinforced by the reinforcing layer 39b, it is possible to prevent damage due to stress generated due to external temperature change and impact during use, and at the time of manufacture Damage can be reduced, and manufacturing yield can be improved.
- the length L1 of the connecting piece 3c shown in FIG. 8 is set to 24 ⁇ m
- the width L2 is set to 5 ⁇ m
- the width L3 of the reinforcing layer 39b is set to 1 ⁇ m.
- the reinforcing layer 39 b is etched when the cavity 11 is formed.
- the width dimension L3 of the reinforcing layer 39b is set smaller than the width dimension L2 of the connecting piece 3c, and the two side edges of the reinforcing layer 39b are located inside the both side edges of the connecting piece 3c in plan view There is a need.
- chamfered portions 3f and 3f are respectively formed between the side edges of the connection piece 3c and the side edges of the second thin film structure portion 3aa.
- a chamfer 3e is also formed between the substantially orthogonal side edges of the letter-like connecting piece 3c.
- each of the chamfered portions 3 f and 3 e is an R-chamfered portion where R (roundness) is 3 ⁇ m.
- the infrared sensor chip 100 is drawn to each thermal infrared detecting unit 3 so as to straddle the support portion 3 d, the one bridge portion 3 bb, the second infrared absorption portion 33 a, the other bridge portion 3 bb, and the support portion 3 d.
- a wire for failure diagnosis (hereinafter referred to as a wire for failure diagnosis or a wire for self-diagnosis) 139 composed of a turned n-type polysilicon layer is provided, and all the wires for failure diagnosis 139 are connected in series.
- the infrared sensor chip 100 is broken in the bridge portion 3bb or the wiring 139 for failure diagnosis depending on the presence or absence of energization to the series circuit of the m ⁇ n failure diagnosis wirings 139 at the time of inspection during production and use. Can be detected. Further, in the infrared sensor chip 100, the temperature sensing portion is detected by supplying power to the series circuit of m ⁇ n fault diagnosis wires 139 at the time of the above-mentioned inspection and use, and detecting the output of each temperature sensing portion 30. It is possible to detect the presence or absence of disconnection of the sensor 30, the variation of the sensitivity (the variation of the output of the temperature sensing unit 30), and the like.
- the wire for failure diagnosis 139 has a meandering shape in the vicinity of the group of the plurality of hot junctions T1 in plan view. Therefore, each hot junction T1 can be efficiently heated by Joule heat generated by energizing the failure diagnosis wiring 139.
- the above-described failure diagnostic wiring 139 is formed on the same plane as the n-type polysilicon layer 34 and the p-type polysilicon layer 35 with the same thickness.
- the above-mentioned infrared absorption layer 39 and fault diagnostic wiring 139 contain the same n-type impurity (for example, phosphorus) as the n-type polysilicon layer 34 at the same impurity concentration (for example, 10 18 to 10 20 cm ⁇ 3 ) And is formed simultaneously with the n-type polysilicon layer 34.
- n-type impurity for example, phosphorus
- impurity concentration for example, 10 18 to 10 20 cm ⁇ 3
- boron may be employed as the p-type impurity of the p-type polysilicon layer 35, and the impurity concentration may be appropriately set in the range of, for example, 10 18 to 10 20 cm ⁇ 3 .
- the impurity concentration of each of the n-type polysilicon layer 34 and the p-type polysilicon layer 35 is 10 18 to 10 20 cm ⁇ 3 , which can reduce the resistance value of the thermocouple and improve the S / N ratio. It can be done.
- the infrared absorption layer 39 and the failure diagnosis wiring 139 are doped with the same n-type impurity as the n-type polysilicon layer 34 at the same impurity concentration, the present invention is not limited to this, for example, the p-type polysilicon layer 35 The same impurities may be doped with the same impurity concentration.
- the failure diagnosis wiring (self-diagnosis wiring) 139 is formed of the same material as the first thermoelectric element n-type polysilicon layer 34 or the second thermoelectric element p-type polysilicon layer 35. Is preferred.
- the refractive index of the n-type polysilicon layer 34, the p-type polysilicon layer 35, the infrared absorption layer 39, and the failure diagnosis wiring 139 is n 1
- the central wavelength of infrared light to be detected is ⁇ . time, so as to set the n-type polysilicon layer 34, p-type polysilicon layer 35, the infrared-absorbing layer 39, and the failure diagnosis wirings 139 respectively thicknesses t1 to lambda / 4n 1.
- the absorption efficiency of infrared light of the wavelength to be detected (for example, 8 to 12 ⁇ m) can be enhanced, and high sensitivity can be achieved.
- the impurity concentration of each of the n-type polysilicon layer 34, the p-type polysilicon layer 35, the infrared absorption layer 39, and the failure diagnosis wiring 139 is 10 18 to 10 20 cm ⁇ 3. It is possible to suppress the reflection of infrared light while increasing the absorptivity, and to increase the S / N ratio of the output of the temperature sensing unit 30. Further, since the infrared absorption layer 39 and the failure diagnosis wiring 139 can be formed in the same process as the n-type polysilicon layer 34, cost reduction can be achieved.
- connection portion 36 and the connection portion 37 of the temperature sensing portion 30 are insulated and separated by the interlayer insulating film 50 on the one surface side of the semiconductor substrate 1.
- Connecting portion 36 of the hot junction T1 side, through the contact holes 50a 1, 50a 2 formed in the interlayer insulating film 50, the first end of both the respective end portions of the polysilicon layer 34, 35 (n-type polysilicon layer 34 And the first end of the p-type polysilicon layer 35) (see FIG. 10).
- connection portion 37 on the cold contact T2 side passes through the contact holes 50a 3 and 50a 4 formed in the interlayer insulating film 50 to form the other end portions of the polysilicon layers 34 and 35 (the n-type polysilicon layer 34
- the second end and the second end of the p-type polysilicon layer 35 are electrically connected (see FIG. 9).
- the MOS transistor 4 is formed in the formation region A2 of the MOS transistor 4 on the one surface side of the semiconductor substrate 1 (see FIG. 5).
- ap + -type well region 41 is formed on the one surface side (front side) of the semiconductor substrate 1, and n + -type is formed in the p + -type well region 41.
- the drain region 43 and the n + -type source region 44 are formed apart from each other.
- the p + -type well region 41, p ++ type channel stopper region 42 which surrounds the n + -type drain region 43 and the n + -type source region 44 is formed.
- the gate electrode 46 is formed of a polysilicon layer.
- a drain electrode 47 made of a metal material (for example, Al-Si or the like) is formed on the n + -type drain region 43, and a metal material (for example, Al-Si or the like) is formed on the n + -type source region 44.
- Source electrode 48 is formed.
- drain electrode 47 is electrically connected to n + -type drain region 43 through contact hole 50 d formed in interlayer insulating film 50
- source electrode 48 is n + + through contact hole 50 e formed in interlayer insulating film 50. It is electrically connected to the source region 44.
- each pixel portion 2 of infrared sensor chip 100 source electrode 48 of MOS transistor 4 and one end of temperature sensitive portion 30 are electrically connected, and the other end of temperature sensitive portion 30 is electrically connected to reference bias line 5 It is done. Further, in each pixel portion 2, the drain electrode 47 of the MOS transistor 4 is electrically connected to the vertical readout line 7, and the gate electrode 46 is formed of an n-type polysilicon interconnection continuously and integrally formed on the gate electrode 46. And is electrically connected to the horizontal signal line 6.
- a ground electrode 49 made of a metal material (for example, Al-Si etc.) It is formed.
- the ground electrode 49 is electrically connected to the common ground line 8 for element separation by biasing the p ++ -type channel stopper region 42 to a lower potential than the n + -type drain region 43 and the n + -type source region 44. It is connected to the.
- the ground electrode 49 is electrically connected to the p ++ -type channel stopper region 42 through the contact hole 50 f formed in the interlayer insulating film 50.
- the self-diagnosis wiring 139 which warms the hot junction T1 by Joule heat generated by energization is provided, the self-diagnosis wiring 139 is energized to output the output of the thermopile 30a. By measuring it, it is possible to determine the presence or absence of a failure such as disconnection of the thermopile 30a, and the reliability can be improved. Furthermore, the self-diagnosis wiring 139 can be used for the semiconductor substrate 1 in the thermal infrared detector 3.
- the heat capacity of the hot junction T1 of the thermopile 30a due to the self-diagnosis wiring 139 can be prevented from overlapping with the thermopile 30a, and sensitivity and response speed can be improved.
- the self-diagnosis wiring 139 also absorbs infrared radiation from the outside in the normal time when the self-diagnosis is not performed at the time of use, so that the temperatures of the plurality of hot junctions T1 can be made uniform and sensitivity Improve the In the infrared sensor chip 100, since the infrared absorption layer 39 and the reinforcing layer 39b also absorb infrared rays from the outside, the temperatures of the plurality of hot junctions T1 can be made uniform, and the sensitivity can be improved.
- self-diagnosis at the time of use of the infrared sensor chip 100 is periodically performed by a self-diagnosis circuit (not shown) provided in the IC chip 102, it is not necessarily required to be periodically performed.
- the first thin film structure portion 3a is provided in parallel along the inner circumferential direction of the cavity portion 11 by providing a plurality of linear slits 13, and each of the thermal type infrared detection portions 3 It is separated into a plurality of second thin film structure portions 3aa extended inward from a support portion 3d which is a portion surrounding the hollow portion 11, and a warm contact T1 of the thermopile 30a is provided for each second thin film structure portion 3aa.
- all the thermopiles 30a are electrically connected in a connection relationship in which the output change with respect to the temperature change becomes large compared to the case where the output is taken out for each thermopile 30a, the response speed and the sensitivity can be improved.
- the self-diagnosis wiring 139 is formed across all the second thin film structures 3aa, all the thermopiles 30 of the thermal infrared detection unit 3 are formed. It is possible to self-diagnosis collectively the. Further, in the infrared sensor chip 100, since the connecting piece 3c connecting the adjacent second thin film structural parts 3aa and 3aa is formed, the warpage of each second thin film structural part 3aa can be reduced, and the structure is stabilized. It is possible to improve the sensitivity and stabilize the sensitivity.
- the n-type polysilicon layer 34, the p-type polysilicon layer 35, the infrared absorption layer 39, the reinforcing layer 39b, and the self-diagnosis wiring 139 are set to the same thickness. Uniformity of stress balance of thin film structure part 3aa of 2 is improved, warpage of second thin film structure part 3aa can be suppressed, variation in sensitivity among products and variation in sensitivity among pixel parts 2 are reduced it can.
- the self-diagnosis wiring 139 is formed of the same material as the n-type polysilicon layer 34 which is the first thermoelectric element or the p-type polysilicon layer 35 which is the second thermoelectric element. Therefore, the self-diagnosis wiring 139 can be formed simultaneously with the first thermoelectric element or the second thermoelectric element, and the cost can be reduced by simplifying the manufacturing process.
- the infrared sensor chip 100 since the plurality of pixel units 2 provided with the infrared absorption unit 33 and the self-diagnosis wiring 139 are provided in the form of an array on the one surface side of the semiconductor substrate 1, By energizing the self-diagnosis wiring 139 of each pixel unit 2 at the time of self-diagnosis at the time, it becomes possible to grasp the variation of the sensitivity of the temperature sensing unit 30 of each pixel unit 2.
- the infrared sensor chip 100 includes the MOS transistor 4 for reading out the output of the temperature sensing unit 30 for each pixel unit 2, the number of output pads Vout (see FIG. 14) can be reduced. Miniaturization and cost reduction can be achieved.
- a first silicon oxide film 31 having a first predetermined film thickness (for example, 0.3 ⁇ m) and a second predetermined film thickness (for example, the first film thickness) are provided on the one surface side (front side) of the semiconductor substrate 1 made of silicon substrate.
- An insulating layer forming step of forming an insulating layer formed of a laminated film with the silicon nitride film 32 of 0.1 ⁇ m) is performed.
- the first silicon oxide film 31 is formed by thermally oxidizing the semiconductor substrate 1 at a predetermined temperature (for example, 1100 ° C.), and the silicon nitride film 32 is formed by the LPCVD method.
- a well region forming step of forming ap + type well region 41 on the one surface side of the semiconductor substrate 1 is performed, and subsequently, ap + type well on the one surface side of the semiconductor substrate 1
- a channel stopper region forming step of forming p ++ -type channel stopper region 42 in region 41 the structure shown in FIG. 15B is obtained.
- the second silicon oxide film (thermal oxide film) 51 is selectively formed by thermally oxidizing the exposed portion on the one surface side of the semiconductor substrate 1 at a predetermined temperature.
- the silicon oxide film 51 is patterned using a photolithography technique and an etching technique using a mask for forming the p + -type well region 41. Subsequently, ion implantation of a p-type impurity (for example, boron or the like) is performed and then drive-in is performed to form the p + -type well region 41. Further, in the channel stopper region formation step, the first silicon oxide film (thermal oxide film) 52 is selectively formed by thermally oxidizing the one surface side of the semiconductor substrate 1 at a predetermined temperature. Thereafter, the third silicon oxide film 52 is patterned using photolithography technology and etching technology using a mask for forming the p ++ -type channel stopper region 42.
- a p-type impurity for example, boron or the like
- the first silicon oxide film 31, the second silicon oxide film 51 and the third silicon oxide film 52 constitute a silicon oxide film 1 b on the one surface side of the semiconductor substrate 1.
- the source and drain formation step of forming a n + -type drain region 43 and the n + -type source region 44.
- ion implantation of an n-type impurity for example, phosphorus or the like
- n + -type drain region 43 and n + -type source region 44 are formed.
- a gate insulation film is formed on the one surface of the semiconductor substrate 1 by thermal oxidation to form a gate insulation film 45 made of a silicon oxide film (thermal oxide film) of a predetermined thickness (for example, 600 ⁇ ). Perform the process. Subsequently, the gate electrode 46, the horizontal signal line 6 (see FIG.
- a polysilicon layer forming step is performed to form a non-doped polysilicon layer having a predetermined film thickness (for example, 0.69 ⁇ m) as a basis of the wiring 139 by the LPCVD method. Thereafter, the gate electrode 46, the horizontal signal line 6, the n-type polysilicon layer 34, the p-type polysilicon layer 35, the infrared absorption layer 39, and the failure diagnosis among the non-doped polysilicon layers using photolithography technology and etching technology.
- a polysilicon layer patterning process is performed to perform patterning so that portions corresponding to the respective wires 139 remain.
- p-type polysilicon layer 35 is formed by performing ion implantation of p-type impurities (for example, boron etc.) in a portion corresponding to p-type polysilicon layer 35 in the non-doped polysilicon layer and then performing drive-in.
- p-type impurities for example, boron etc.
- n-type impurities for example, phosphorus etc.
- the n-type polysilicon layer formation step of forming the n-type polysilicon layer 34, the infrared absorption layer 39, the failure diagnosis wiring 139, the gate electrode 46, and the horizontal signal line 6 by performing drive-in after ion implantation thus, the structure shown in FIG. 16A is obtained.
- the order of the p-type polysilicon layer forming step and the n-type polysilicon layer forming step may be reversed.
- an interlayer insulating film forming step of forming an interlayer insulating film 50 on the one surface side of the semiconductor substrate 1 is performed. Then, photolithography and the interlayer by using an etching technique insulating film 50 in the contact holes 50a 1, 50a 2, 50a 3 , 50a 4, 50d, 50e, 50f ( FIGS. 9, 10, see FIG. 12) By performing the contact hole forming step to be formed, the structure shown in FIG. 16B is obtained.
- a BPSG film having a predetermined film thickness (for example, 0.8 ⁇ m) is deposited by the CVD method on the one surface side of the semiconductor substrate 1 and then reflowed at a predetermined temperature (for example, 800 ° C.)
- a predetermined temperature for example, 800 ° C.
- connection portions 36 and 37, drain electrode 47, source electrode 48, reference bias line 5, vertical readout line 7, ground line 8, common ground are formed on the entire surface of semiconductor substrate 1 on the one surface.
- a metal film for example, an Al-Si film having a predetermined film thickness (for example, 2 ⁇ m) serving as a basis of the line 9 and each pad Vout, Vsel, Vref, Vdd, Gnd, etc. (see FIG. 14) is formed by sputtering or the like A metal film formation process is performed.
- etching in the metal film patterning process is performed by RIE. Further, by performing this metal film patterning process, the hot junction T1 and the cold junction T2 are formed.
- a PSG film of a predetermined film thickness (for example, 0.5 ⁇ m) and a predetermined film thickness (for example, 0) are formed on the one surface side of the semiconductor substrate 1 (that is, the surface side of the interlayer insulating film 50).
- a passivation film forming step of forming a passivation film 60 composed of a laminated film with an NSG film of 5 .mu.m) by the CVD method the structure shown in FIG. 17B is obtained.
- the laminated structure portion including the silicon oxide film 31, the silicon nitride film 32, the interlayer insulating film 50, the passivation film 60 and the like and the temperature sensitive portion 30 etc. embedded is patterned.
- the layered structure patterning step of forming the thin film structure 3aa and the connection piece 3c of 2 is performed to obtain the structure shown in FIG. 18A.
- the slits 13 and 14 are formed.
- an opening forming process is performed to form an opening (not shown) for exposing each pad Vout, Vsel, Vref, Vdd, and Gnd using photolithography technology and etching technology.
- the etching solution is introduced with the slits 13 and 14 as etching solution introducing holes, and the cavity portion 11 is formed in the semiconductor substrate 1 by anisotropically etching (crystal anisotropic etching) the semiconductor substrate 1.
- an infrared sensor chip 100 having a structure shown in FIG. 18B is obtained.
- the etching in the opening formation step is performed by RIE.
- the TMAH solution heated to a predetermined temperature for example, 85 ° C.
- the etching solution is not limited to the TMAH solution, and other alkaline solutions (eg, KOH solution etc.) ) May be used.
- the separation process may be performed to separate the individual infrared sensor chips 100 after the cavity formation process is completed.
- the well-known general MOS transistor manufacturing method is employed, and formation of a thermal oxide film by thermal oxidation, photolithography technology and etching
- the p + well region 41, the p ++ channel stopper region 42, and the n + drain region 43 are repeated by repeating the basic steps of thermal oxide film patterning, ion implantation of impurities, and drive-in (impurity diffusion) by techniques.
- n + -type source regions 44 are formed.
- 11 has a square pyramidal shape, it is not limited to a square pyramidal shape, and may have a square pyramidal shape.
- the plane orientation of the one surface of the semiconductor substrate 1 is not particularly limited.
- the semiconductor substrate 1 a single crystal silicon substrate of which the one surface is a (110) plane may be used as the semiconductor substrate 1.
- the IC chip 102 is an ASIC (: Application Specific IC), and is formed using a silicon substrate.
- ASIC Application Specific IC
- the IC chip 102 includes, for example, a control circuit that controls the infrared sensor chip 100, and an amplification circuit that amplifies output voltages of a plurality of input pads electrically connected to the plurality of output pads 80 of the infrared sensor chip 100.
- a multiplexer for alternatively inputting the output voltages of the plurality of input pads to the amplifier circuit, an output of the amplifier circuit (an output according to a temperature difference between the hot junction T1 and the cold junction T2 in the pixel section 2)
- the arithmetic circuit or the like for obtaining the temperature based on the output of the thermistor 101 (the output corresponding to the absolute temperature and assumed to be the output according to the temperature of the cold junction T2 in the pixel section 2), An infrared image can be displayed on an external display device.
- the IC chip 102 also includes the self-diagnosis circuit described above.
- the circuit configuration of the IC chip 102 is not particularly limited. Also, the thermistor 101 does not have to be provided.
- the internal space (airtight space) 165 of the package 103 formed of the package body 104 and the package lid 105 is in a nitrogen gas (dry nitrogen gas) atmosphere, but is not limited thereto. It may be a vacuum atmosphere.
- a wiring pattern (not shown) made of a metal material and an electromagnetic shielding layer (not shown) are formed on a substrate 104a made of an insulating material, and the electromagnetic shielding layer is provided by this electromagnetic shielding layer.
- the lens 153 has conductivity, and the lens 153 is bonded to the metal cap 152 with a conductive material, and has conductivity.
- the package lid 105 is electrically connected to the electromagnetic shielding layer of the package body 104.
- the electromagnetic shielding layer of the package body 104 and the package lid 105 can be at the same potential.
- the package 103 is an external sensor circuit (not shown) including the infrared sensor chip 100, the IC chip 102, the thermistor 101, the above wiring pattern, and bonding wires (not shown) described later. It has an electromagnetic shielding function to prevent electromagnetic noise.
- the package body 104 is constituted by a flat ceramic substrate on which the infrared sensor chip 100, the IC chip 102 and the thermistor 101 are mounted on one surface side (front side).
- the package body 104 is formed of a ceramic in which the base body 104 a is an insulating material, and the infrared sensor chip 100 and the IC chip 102 are formed on a portion of the wiring pattern formed on one surface side (front side) of the substrate 104 a. Respective pads (not shown) are appropriately connected via bonding wires.
- the infrared sensor chip 100 and the IC chip 102 are electrically connected to each other through a bonding wire, a wiring pattern of the package body 104, and the like.
- As each bonding wire it is preferable to use an Au wire that is more resistant to corrosion than an Al wire.
- the moisture resistance and the heat resistance of the package body 104 are improved as compared with the case where an organic material such as an epoxy resin is employed as the insulating material.
- an organic material such as an epoxy resin
- alumina is employed as a ceramic of the insulating material, it is not particularly limited to alumina, and aluminum nitride, silicon carbide or the like may be employed.
- the thermal conductivity of alumina is about 14 W / m ⁇ K.
- an external connection electrode (not shown) constituted by a part of the above-described wiring pattern is formed across the other surface (rear surface) and the side surface of the base 104a.
- the infrared sensor chip 100 and the IC chip 102 are mounted on the package body 104 using a die bonding agent.
- a die bonding agent an insulating adhesive such as epoxy resin or silicone resin, or a conductive adhesive such as solder (lead free solder, Au-Sn solder) or silver paste may be used.
- bonding may be performed by, for example, a normal temperature bonding method or a eutectic bonding method using Au—Sn eutectic or Au—Si eutectic without using a die bonding agent.
- the thermal conductivity of the epoxy resin is about 0.2 W / m ⁇ K.
- the outer peripheral shapes of the infrared sensor chip 100 and the IC chip 102 are rectangular (square to rectangular).
- the package lid 105 is formed in a box shape in which one surface on the package main body 104 side is open, and the metal cap 152 in which the opening window 152a is formed at a portion corresponding to the infrared sensor chip 100 and the opening window 152a of the metal cap 152
- the lens 153 is joined to the metal cap 152 in the following manner, and the one surface of the metal cap 152 is airtightly joined to the package body 104 in the form of being closed by the package body 104.
- a frame-shaped metal pattern 147 (see FIG.
- the package lid 105 and the metal pattern 147 of the package body 104 are metal-joined by seam welding (resistance welding method), and the airtightness and the electromagnetic shielding effect can be enhanced.
- the metal cap 152 of the package lid 105 is formed of kovar and is plated with Ni.
- the metal pattern 147 of the package body 104 is formed of kovar, is plated with Ni, and is further plated with Au.
- the thermal conductivity of Kovar is about 16.7 W / m ⁇ K.
- the method of joining the package lid 105 and the metal pattern 147 of the package body 104 is not limited to seam welding, and may be joined by other welding (for example, spot welding) or a conductive resin.
- a conductive resin if an anisotropic conductive adhesive is used as the conductive resin, the content of the conductive particles dispersed in the resin (binder) is small, and the package lid 105 and the package body are heated and pressurized at the time of bonding. Since the thickness of the joint portion with 104 can be reduced, it is possible to suppress the entry of moisture or gas (for example, water vapor, oxygen, etc.) into the package 103 from the outside.
- the conductive resin one in which a desiccant such as barium oxide or calcium oxide is mixed may be used as the conductive resin.
- cover 105 is made into the rectangular shape, not only a rectangular shape but circular shape may be sufficient, for example.
- the metal cap 152 of the package lid 105 is provided with a flange portion 152b extending outward from the end edge on the package body 104 side over the entire periphery, and the package portion 152b extends over the entire periphery. It is joined with 104. That is, the package lid 105 is bonded to the package body 104 by bonding the collar 152 b to the metal pattern 147.
- the lens 153 is a plano-convex aspheric lens. Therefore, in the infrared sensor according to the present embodiment, the sensitivity of the infrared sensor chip 100 can be enhanced by the improvement of the light receiving efficiency of infrared rays while the lens 153 is made thinner. Further, in the infrared sensor of the present embodiment, the detection area of the infrared sensor chip 100 can be set by the lens 153.
- the lens 153 is formed using a semiconductor substrate different from the semiconductor substrate 1 of the infrared sensor chip 100.
- the lens 153 has an anode whose contact pattern with the semiconductor substrate (here, silicon substrate) is designed according to the desired lens shape, and the contact with the semiconductor substrate is ohmic contact with one surface of the semiconductor substrate.
- the other surface side of the semiconductor substrate is anodized in an electrolytic solution consisting of a solution for etching and removing oxides of constituent elements of the semiconductor substrate after formation to form a porous portion to be a removal site, It is comprised by the semiconductor lens (here silicon lens) formed by removing the porous part.
- the lens 153 has conductivity.
- the manufacturing method of the semiconductor lens which applied this kind of anodic oxidation technique for example, since it is disclosed by Japanese patent 3899705, Japanese patent 3890705 grade
- the detection area of the infrared sensor chip 100 can be set by the lens 153 composed of the above-described semiconductor lens, and as the lens 153, a semiconductor having a short focus and a large aperture diameter and a small aberration than a spherical lens. Since a lens can be adopted, thinning of the package 103 can be achieved by shortening the focus.
- the infrared sensor of this embodiment assumes infrared rays in the wavelength band (8 ⁇ m to 13 ⁇ m) in the vicinity of 10 ⁇ m emitted from the human body as infrared rays to be detected by the infrared sensor chip 100. Compared with GaAs and the like, environmental impact is less, cost reduction is possible compared to Ge, and Si with smaller wavelength dispersion than ZnS is adopted.
- the lens 153 is fixed to the periphery of the opening 152 a of the metal cap 152 by a bonding portion (not shown) made of a conductive adhesive (for example, lead-free solder, silver paste, etc.).
- a conductive adhesive for example, lead-free solder, silver paste, etc.
- the lens 153 is electrically connected to the electromagnetic shield layer of the package body 104 through the joint and the metal cap 152, so that electromagnetic noise can be prevented.
- the shielding property can be enhanced, and a reduction in S / N ratio due to extraneous electromagnetic noise can be prevented.
- the lens 153 described above is made of an optical multilayer film (multilayer interference filter film) that transmits infrared light in a desired wavelength range including the wavelength of infrared light to be detected by the infrared sensor chip 100 and reflects infrared light outside the wavelength range. It is preferable to provide a filter part (not shown). By providing such a filter part, it becomes possible to cut out infrared light and visible light of unnecessary wavelength bands other than the desired wavelength band by the filter part, and it is possible to suppress the generation of noise due to sunlight etc. High sensitivity can be achieved.
- the material of the metal cap 152, the lens 153, and the filter portion so that the package lid 105 has a function of cutting visible light.
- a resin portion (not shown) for blocking light from the outside is provided on at least the surface on the package lid 105 side of the IC chip 102 made of a bare chip, the electromotive force of the IC chip 102 caused by visible light Malfunction can be prevented.
- the package body 104 is formed in a flat plate shape, mounting of the infrared sensor chip 100 and the IC chip 102 on the package body 104 is facilitated, and the cost of the package body 104 can be reduced. It becomes. Further, since the package main body 104 is formed in a flat plate shape, the package main body 104 is formed of a multilayer ceramic substrate in a box shape having an open surface, and the infrared sensor chip 100 is formed on the inner bottom surface of the package main body 104. As compared with the case of mounting, the accuracy of the distance between the infrared sensor chip 100 and the lens 153 disposed on the one surface side of the package main body 104 can be enhanced, and the sensitivity can be further enhanced.
- the cover member 106 is a front plate portion 107 located in front of the infrared sensor chip 100 and having the window hole 108 formed therein, and extends rearward from the outer peripheral edge of the front plate portion 107 to have the IC chip 102 and the infrared sensor chip 100 A side plate portion 109 is joined to the package body 104 between the two.
- the front plate portion 107 is disposed between the lens 153 and the infrared sensor chip 100 so as to be separated from each of the lens 153 and the infrared sensor chip 100.
- the cover member 106 is disposed such that the window hole 108 is located between the infrared sensor chip 100 and the lens 153 (a part of the package lid 105 having a function of transmitting infrared light to be detected).
- the front plate portion 107 of the cover member 106 is separated from the package 103.
- the side plate portion 109 is disposed between the IC chip 102 and the infrared sensor chip 100 so as to be separated from each of the IC chip 102 and the infrared sensor chip 100, but the distance between the side plate portion 109 and the IC chip 102 It is preferable to set the distance shorter than the distance between the unit 109 and the infrared sensor chip 100. In short, it is preferable to arrange the side plate portion 109 close to the IC chip 102. That is, the cover member 106 is disposed close to both the infrared sensor chip 100 and the IC chip 102.
- the heat generated by the IC chip 102 is transmitted to the package body 104 and also to the cover member 106.
- the heat generated in the IC chip 102 is transferred to the infrared sensor chip 100 through the path through the package body 104 and the path through the cover member 106.
- the cover member 106 As a material of the cover member 106 , Kovar is adopted, but not limited to this, for example, stainless steel, copper, aluminum or the like may be adopted. In the present embodiment, the cover member 106 is formed of a conductive material. When the cover member 106 is formed of a conductive material, the cover member 106 can be provided with an electromagnetic shielding property. Therefore, electromagnetic noise from the IC chip 102 to the infrared sensor chip 100 can be reduced.
- the cover member 106 described above has a rectangular outer peripheral shape of the front plate portion 107, and the outer size of the front plate portion 107 is set so that the infrared sensor chip 100 can be contained in the projection area of the outer peripheral edge of the front plate portion 107.
- the side plate portion 109 of the cover member 106 and the package body 104 may be joined by, for example, an adhesive (for example, epoxy resin), but from the viewpoint of thermally bonding the cover member 106 and the package body 104, the thermal conductivity Materials are preferable, and from the viewpoint of electrically connecting the cover member 106 with the shield layer of the package body 104 to provide electromagnetic shielding properties, a material having conductivity is preferable. For example, silver paste or the like is adopted. It is preferable to do.
- the window holes 108 of the front plate portion 107 are opened in a rectangular shape.
- the opening shape of the window hole 108 is set to be similar to the outer peripheral shape of the infrared sensor chip 100, but it is not necessary to be similar.
- the package 103 has the window hole 108 for transmitting the infrared ray to the infrared sensor chip 100, and the hot contact T1 and the cold contact of each pixel unit 2 according to the heat generation of the IC chip 102.
- the cover member 106 that makes the temperature change amount of T2 uniform, the heat generated from the IC chip 102 is transmitted to the package body 104 and the cover member 106.
- the heat caused by the heat generation of the IC chip 102 is transmitted to the pixel portion 2 of the infrared sensor chip 100 through the path through the package body 104 and the path through the cover member 106 It becomes possible to equalize the heat transmitted to each pixel section 2 of the chip 100, and it is possible to suppress the variation of the offset voltage in the plane of the infrared sensor chip 100 due to the heat generation of the IC chip 102 and the variation of S / N ratio. Can be suppressed.
- the offset voltage of the temperature sensitive portion 30 in the pixel unit 2 closest to the IC chip 102 in the infrared sensor chip 100 It is possible to reduce the difference with the offset voltage of the temperature sensing unit 30 in the pixel unit 2 farthest from the pixel.
- the cover member 106 is provided in the package 103, so that the infrared ray emitted from the IC chip 102 due to the heat generation of the IC chip 102 and the metal cap 152 emitted from the package lid 105 Infrared can also be blocked from reaching the infrared sensor chip 100.
- the cover member 106 is located in front of the infrared sensor chip 100 and has a front plate portion 107 in which the window hole 108 is formed, and the IC chip 102 and the infrared sensor chip extended rearward from the outer peripheral edge of the front plate portion 107.
- 100 and 100 are configured with the side plate portion 109 joined to the package main body 104, so that it is possible to prevent the infrared radiation emitted from the IC chip 102 from reaching the infrared sensor chip 100 directly. Become.
- the package body 104 is formed in a flat plate shape, mounting of the cover member 106 on the package body 104 is also facilitated.
- the front plate portion 107 is separated from the package 103. Therefore, the front plate portion 107 is less susceptible to the temperature change of the package 103 as compared with the case where the front plate portion 107 is in contact with the package 103.
- the MOS transistor 4 is provided in each pixel section 2 of the infrared sensor chip 100, noise due to the wiring between the temperature sensitive section 30 and the MOS transistor 4 can be reduced. Is possible.
- the electromagnetic shield By electrically connecting to the layers, the influence of extraneous electromagnetic noise on the sensor circuit constituted by the infrared sensor chip 100 and the IC chip 102 can be reduced, and the S / N ratio caused by the extraneous electromagnetic noise Can be suppressed.
- the electromagnetic shield layer is electrically connected to the ground pattern of the circuit board or the like to reduce the influence of extraneous electromagnetic noise on the sensor circuit described above. It is possible to suppress the decrease in S / N ratio caused by extraneous electromagnetic noise.
- the basic configuration of the infrared sensor of the present embodiment is substantially the same as that of the first embodiment, and as shown in FIG. 19, the shape of the cover member 106 is different.
- symbol is attached
- the second area 142 for mounting the IC chip 102 is recessed from the surface of the first area 141 for mounting the infrared sensor chip 100. Therefore, a step is formed between the surface of the first area 141 and the second area 142.
- the package body 104 is set to retract the surface of the second region 142 so that the size of the step becomes smaller than the thickness of the IC chip 102.
- the cover member 106 is a front plate portion 107 located in front of the infrared sensor chip 100 and having a window hole 108 formed therein, and two side plates extended rearward from the outer peripheral edge of the front plate portion 107 and joined to the package body 104 And a unit 109.
- the distance between the front plate portion 107 and the infrared sensor chip 100 is set longer than the infrared sensor of the first embodiment.
- the two side plate portions 109 are located on the sides of both side surfaces of the infrared sensor chip 100 along the direction in which the infrared sensor chip 100 and the IC chip 102 are arranged in parallel.
- the front plate portion 107 is formed in such a size that the infrared sensor chip 100 and the IC chip 102 can be accommodated in the projection area of the outer peripheral line of the front plate portion 107. Further, in the front plate portion 107, protruding pieces 107b extend rearward from both side edges in the longitudinal direction along the direction in which the infrared sensor chip 100 and the IC chip 102 are juxtaposed.
- the projection piece 107 b has a smaller dimension of projection from the front plate portion 107 than the side plate portion 109, and the front plate is positioned forward of the surface of the infrared sensor chip 100 including the tip surface of the projection piece 107 b. The projecting dimension from the portion 107 is set.
- the cover member 106 can be reduced compared to the first embodiment while making it possible to suppress the variation in S / N ratio in the plane of the infrared sensor chip 100 caused by the heat generation of the IC chip 102. Can be joined more stably, and it is possible to prevent the front plate portion 107 from tilting with respect to the surface of the infrared sensor chip 100. Further, in the infrared sensor of the present embodiment, since the side plate portion 109 is not located between the infrared sensor chip 100 and the IC chip 102, the infrared sensor chip 100 and the IC chip 102 should be directly connected only by the bonding wires. Is possible.
- the infrared sensor of this embodiment does not have the protruding piece 107b (see FIG. 19) described in the second embodiment, and as shown in FIG. 20, the distance between the front plate 107 and the infrared sensor chip 100 The point which is set shorter than the infrared sensor of Embodiment 2 is different.
- the infrared sensor it is possible to suppress the variation in S / N ratio in the plane of the infrared sensor chip 100 caused by the heat generation of the IC chip 102, and the front plate portion 107 and the infrared sensor The distance to the chip 100 can be shortened.
- the basic configuration of the infrared sensor of the present embodiment is substantially the same as that of the second embodiment, and as shown in FIG. 21, the shape of the cover member 106 is different.
- symbol is attached
- the cover member 106 in the present embodiment is the same as the second embodiment in that the window hole 108 of the front plate portion 107 is rectangular, but the inner peripheral line (4 of the window hole 108 on the IC chip 102 side in plan view In the embodiment, one of the sides; one side on the left side of FIG. 21B) is closer to the IC chip 102 than the outer peripheral line (one side of the four sides) of the infrared sensor chip 100 on the IC chip 102 side. It is different from 2.
- the infrared sensor of the present embodiment it is possible to reduce the heat transmitted to the infrared sensor chip 100 through the cover member 106 as compared to the second embodiment.
- the cavity 11 of the semiconductor substrate 1 may be formed to penetrate in the thickness direction of the semiconductor substrate 1.
- an anisotropic etching technique using a dry etching device of an inductively coupled plasma (ICP) type, for example, for an area scheduled to form the cavity 11 in the semiconductor substrate 1 is used. It may be formed using.
- the infrared sensor chip 100 may have a plurality of pixel units 2 including the temperature sensing unit 30 formed of the thermopile 30 a arranged in an array on one surface side of the semiconductor substrate 1, and the structure is particularly
- the number of thermopiles 30a constituting the temperature sensing unit 30 is not limited to a plurality, and may be one.
- the semiconductor substrate 1 is not limited to a silicon substrate, and may be, for example, a germanium substrate or a silicon carbide substrate.
- a flat silicon substrate may be disposed to have a function of transmitting infrared light.
- the arrangement of the lens 153 in the package lid 104 is not particularly limited, and the lens 153 may be arranged outside the package lid 104.
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Abstract
Description
以下、本実施形態の赤外線センサについて図1~図14を参照しながら説明する。
本実施形態の赤外線センサの基本構成は実施形態1と略同じであり、図19に示すように、カバー部材106の形状などが相違する。なお、実施形態1と同様の構成要素には同一の符号を付して説明を適宜省略する。
本実施形態の赤外線センサの基本構成は実施形態2と略同じであり、図20に示すように、カバー部材106の形状などが相違する。なお、実施形態2と同様の構成要素には同一の符号を付して説明を省略する。
本実施形態の赤外線センサの基本構成は実施形態2と略同じであり、図21に示すように、カバー部材106の形状が相違する。なお、実施形態2と同様の構成要素には同一の符号を付して説明を省略する。
Claims (10)
- サーモパイルにより構成される感温部を具備する複数の画素部が半導体基板の一表面側においてアレイ状に配置された赤外線センサチップと、前記赤外線センサチップの出力信号を信号処理するICチップと、前記赤外線センサチップおよび前記ICチップが収納されたパッケージとを備え、
前記パッケージは、前記赤外線センサチップおよび前記ICチップが横並びで実装されたパッケージ本体と、前記赤外線センサチップでの検知対象の赤外線を透過する機能を有し前記パッケージ本体との間に前記赤外線センサチップおよび前記ICチップを囲む形で前記パッケージ本体に気密的に接合されたパッケージ蓋とを備え、
前記パッケージ内に、前記赤外線センサチップへの赤外線を通す窓孔を有し前記ICチップの発熱に応じた前記各画素部の温接点および冷接点の温度変化量を均一化するカバー部材を設けてなることを特徴とする赤外線センサ。 - 前記カバー部材は、前記赤外線センサチップの前方に位置し前記窓孔が形成された前板部と、前記前板部の外周縁から後方へ延設され前記ICチップと前記赤外線センサチップとの間で前記パッケージ本体に接合された側板部とで構成されてなることを特徴とする請求項1記載の赤外線センサ。
- 前記パッケージ本体は、前記赤外線センサチップを実装する第1の領域の表面よりも前記ICチップを実装する第2の領域の表面を後退させてあり、前記カバー部材は、前記赤外線センサチップの前方に位置し前記窓孔が形成された前板部と、前記前板部の外周縁から後方へ延設され前記赤外線センサチップと前記ICチップとの並設方向に沿った前記赤外線センサチップの両側面それぞれの側方に位置し前記パッケージ本体に接合された2つの側板部とを備え、前記前板部は、前記前板部の外周線の投影領域内に前記赤外線センサチップおよび前記ICチップが収まる大きさに形成されてなることを特徴とする請求項1記載の赤外線センサ。
- 前記カバー部材は、前記前板部の前記窓孔が矩形状であり、平面視で前記窓孔の前記ICチップ側の内周線が前記赤外線センサチップの前記ICチップ側の外周線よりも前記ICチップ側にあることを特徴とする請求項3記載の赤外線センサ。
- 前記カバー部材は、前記赤外線センサチップの前方に位置し前記窓孔が形成された前板部と、前記前板部から後方へ延接され前記パッケージ本体に接合された側板部とを備えることを特徴とする請求項1記載の赤外線センサ。
- 前記カバー部材は、前記赤外線センサチップと前記ICチップの両方に近接して配置されていることを特徴とする請求項5記載の赤外線センサ。
- 前記前板部は、この前板部の外周線の投影領域内に少なくとも前記赤外線センサチップが収まる大きさに、形成されていることを特徴とする請求項5記載の赤外線センサ。
- 前記カバー部材は、導電性材料から形成されることを特徴とする請求項1記載の赤外線センサ。
- 前記カバー部材は、導電性材料によって前記パッケージ本体に接合されることを特徴とする請求項8記載の赤外線センサ。
- 前記パッケージ本体は、絶縁材料からなる基体と、金属材料からなる電磁シールド層とを備えることを特徴とする請求項9記載の赤外線センサ。
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KR1020137001304A KR20130031342A (ko) | 2010-06-24 | 2011-06-23 | 적외선 센서 |
CN201180027200.0A CN102933942B (zh) | 2010-06-24 | 2011-06-23 | 红外线传感器 |
US13/806,111 US9478682B2 (en) | 2010-06-24 | 2011-06-23 | IR sensor package including a cover member and a sensor chip recessed into the package body |
EP11798227.2A EP2587234A1 (en) | 2010-06-24 | 2011-06-23 | Infrared sensor |
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JP2010144176A JP5842118B2 (ja) | 2010-06-24 | 2010-06-24 | 赤外線センサ |
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WO2013088653A1 (ja) * | 2011-12-14 | 2013-06-20 | パナソニック株式会社 | 赤外線センサ |
WO2018151200A1 (ja) | 2017-02-15 | 2018-08-23 | パナソニックIpマネジメント株式会社 | 赤外線センサチップと、これを用いた赤外線センサ |
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Also Published As
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JP2012008003A (ja) | 2012-01-12 |
KR20130031342A (ko) | 2013-03-28 |
US20130093037A1 (en) | 2013-04-18 |
JP5842118B2 (ja) | 2016-01-13 |
CN102933942A (zh) | 2013-02-13 |
TW201214691A (en) | 2012-04-01 |
CN102933942B (zh) | 2014-12-10 |
US9478682B2 (en) | 2016-10-25 |
EP2587234A1 (en) | 2013-05-01 |
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