WO2015146054A1 - 赤外線検出素子及びこれを備える赤外線検出装置 - Google Patents
赤外線検出素子及びこれを備える赤外線検出装置 Download PDFInfo
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- WO2015146054A1 WO2015146054A1 PCT/JP2015/001409 JP2015001409W WO2015146054A1 WO 2015146054 A1 WO2015146054 A1 WO 2015146054A1 JP 2015001409 W JP2015001409 W JP 2015001409W WO 2015146054 A1 WO2015146054 A1 WO 2015146054A1
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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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/34—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using capacitors, e.g. pyroelectric capacitors
-
- 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
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N15/00—Thermoelectric devices without a junction of dissimilar materials; Thermomagnetic devices, e.g. using the Nernst-Ettingshausen effect
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- H10N15/15—Thermoelectric active materials
Definitions
- the present disclosure relates to an infrared detection element that detects infrared rays and an infrared detection device including the same.
- the infrared detection element generates heat by receiving infrared rays, and the temperature of the infrared detection element rises.
- the infrared detecting element detects a change in electrical property with respect to the temperature change.
- Examples of the infrared detection element include a pyroelectric infrared detection element, a resistance bolometer type infrared detection element, a thermocouple (thermopile) type infrared detection element, and the like.
- a pyroelectric infrared detection element using a pyroelectric material detects infrared rays by using electric charges generated on the surface due to a temperature change.
- a resistance bolometer-type infrared detection element using a resistance bolometer material detects infrared rays by using a resistance value that changes according to a temperature change.
- the thermocouple type infrared detection element detects infrared rays by utilizing the Seebeck effect that generates a thermoelectromotive force due to a temperature difference.
- FIG. 11 is a top view schematically showing a conventional infrared detection element 200.
- FIG. 12 is a cross-sectional view schematically showing a 12-12 cross section of the conventional infrared detecting element 200 in FIG.
- the infrared detection unit 120 includes a detection layer 116 that receives infrared rays, a lower electrode layer 140, and an upper electrode layer 150.
- the detection layer 116 is sandwiched between the lower electrode layer 140 and the upper electrode layer 150.
- the infrared detection unit 120 is fixed to the substrate 112 via four support portions provided on two diagonal lines.
- the infrared detection unit 120 is disposed above the cavity 113 provided in the substrate 112.
- the two support portions 130 and 131 provided on one diagonal line are provided with lead-out wirings 170 and 171 for extracting an electrical signal from the infrared detection unit 120.
- the lead wires 170 and 171 are connected to conductive vias 142 penetrating the substrate 112 through the external lead portions 160.
- An insulating film 115 formed on the substrate 112, an extraction wiring 170 connected to the lower electrode layer 140, and an interlayer insulating film 141 are sequentially stacked on the support portion 130.
- an insulating film 115, an interlayer insulating film 141, and an extraction wiring 171 connected to the upper electrode layer 150 are sequentially stacked on the support portion 131.
- the structure in which the infrared detection unit 120 is separated from the substrate 112 is a heat insulating structure that can suppress the heat of the infrared detection unit 120 from diffusing to the substrate 112. Therefore, the infrared detection element 200 can efficiently detect the heat of the infrared detection unit 120 generated by absorbing the incident infrared rays. Thereby, the infrared detection element 200 can increase the sensitivity of infrared detection.
- the order of the lead-out wiring, the insulating film, and the interlayer insulating film to be stacked is different between the support portion 130 and the support portion 131. Therefore, the stress applied to the support part 130 and the stress applied to the support part 131 are different.
- the infrared detection part is twisted. As the infrared detection unit is twisted, the infrared detection unit is inclined with respect to the substrate. As a result, the sensitivity and variation of infrared detection occur. In addition, twisting of the infrared detection unit may cause damage to the support unit and disconnection of the lead-out wiring, which may make infrared detection impossible.
- the present disclosure aims to provide an infrared detection element and an infrared detection device capable of suppressing twisting of the infrared detection unit.
- An infrared detection element includes a substrate having a cavity, an infrared detection unit in which a lower electrode layer, a detection layer, and an upper electrode layer are sequentially stacked, and a first support unit that supports the infrared detection unit above the cavity. And a second support part, and a first external lead part and a second external lead part for taking out an electric signal output from the infrared detection part to the outside, and the first support part is a first laminated in order.
- An upper wiring, a first insulating layer, and a first lower wiring are provided, the upper electrode layer is connected to the first external lead portion via the first upper wiring, and the second support portion is stacked in order. 2
- An upper wiring, a second insulating layer, and a second lower wiring are provided, and the lower electrode layer is connected to the second external lead portion through the second lower wiring.
- the infrared detection element and the infrared detection device according to the present disclosure can suppress twisting of the infrared detection unit.
- FIG. 1 is a top view schematically showing the infrared detection element in the first embodiment.
- FIG. 2 is a sectional view schematically showing a section 2-2 of the infrared detection element in FIG.
- FIG. 3 is a top view schematically showing the arrangement of the lower wiring of the infrared detection element in the first embodiment.
- FIG. 5 is a top view schematically showing the infrared detecting element in the second embodiment.
- FIG. 6 is a cross-sectional view schematically showing a 6-6 cross section of the infrared detection element in FIG.
- FIG. 7 is a top view schematically showing another infrared detection element in the second embodiment.
- FIG. 8 is a top view schematically showing another infrared detection element in the second embodiment.
- FIG. 9 is a top view schematically showing the infrared detecting element in the third embodiment.
- FIG. 10 is a block diagram illustrating a configuration of the infrared detection apparatus according to the fourth embodiment.
- FIG. 11 is a top view schematically showing a conventional infrared detection element.
- FIG. 12 is a cross-sectional view schematically showing a 12-12 cross section of the conventional infrared detecting element in FIG.
- FIG. 1 is a top view schematically showing the infrared detection element 25 in the first embodiment.
- FIG. 2 is a cross-sectional view schematically showing a 2-2 cross section of the infrared detection element 25 in FIG.
- FIG. 3 is a top view schematically showing the arrangement of the lower wiring of the infrared detecting element 25 in the first embodiment.
- the infrared detection element 25 includes a substrate 11, an infrared detection unit 20, a first support unit 30A, a second support unit 30B, a first external extraction unit 60A, and a second external extraction unit 60B.
- the substrate 11 has a cavity 13 formed in a concave shape.
- the infrared detector 20 converts incident infrared energy into an electrical signal and outputs the electrical signal. The output electric signal is taken out to the outside through the first external lead portion 60A and the second external lead portion 60B.
- the first support part 30 ⁇ / b> A and the second support part 30 ⁇ / b> B are connected to the frame part 14 of the substrate 11 and support the infrared detection part 20 above the cavity 13.
- the cavity 13 of the substrate 11 is provided at the center of one main surface of the substrate 11.
- the substrate 11 also has a frame portion 14 that forms a cavity 13.
- the frame portion 14 of the substrate 11 is provided on the outer periphery of the opening of the cavity 13.
- An insulating intermediate layer 15 is formed on the substrate 11 on the substrate 11.
- the intermediate layer 15 extends substantially parallel to the main surface of the substrate 11 and constitutes a part of each of the first support part 30A, the second support part 30B, and the infrared detection part 20.
- FIG. 4A is a cross-sectional view schematically showing a 4A-4A cross section of the infrared detection unit 20 in FIG.
- the infrared detection unit 20 is provided with a lower electrode layer 40, a detection layer 16, and an upper electrode layer 50.
- the intermediate layer 15 of the infrared detection unit 20 is provided on the entire infrared detection unit 20.
- the infrared detection unit 20 has a stacked structure in which the lower electrode layer 40, the detection layer 16, and the upper electrode layer 50 are sequentially stacked on at least a part of the intermediate layer 15.
- an infrared absorption layer 17 is provided on the upper layer of the infrared detection unit 20.
- the infrared detection element 25 detects infrared rays using the pyroelectric effect.
- a pyroelectric material is used for the detection layer 16 of the infrared detector 20.
- the polarization of the pyroelectric material surface changes, and as a result, charges are generated in the lower electrode layer 40 and the upper electrode layer 50.
- the infrared detection element 25 can detect infrared rays by taking out this electric charge as an electric signal.
- the pyroelectric infrared detection element has a high signal output and a high S / N ratio because the noise output is low among the thermal infrared detection elements.
- the pyroelectric infrared detection element can detect a human body at low cost. For this reason, pyroelectric infrared detectors are widely used as automatic switches for automatic lighting and power consumption reduction of equipment.
- the infrared detector 20 is not limited to a pyroelectric body, and a thermopile, a thermistor, a bolometer, or the like can be used.
- the planar view shape of the infrared detector 20 provided in the opening of the cavity 13 is substantially rectangular.
- the infrared detection unit 20 is not limited to a rectangular shape.
- the infrared detection unit 20 may be, for example, a round shape or a polygonal shape.
- the infrared detector 20 is connected to the frame 14 of the substrate 11 via the first support 30A and the second support 30B.
- the infrared detection unit 20 is disposed away from the surface of the substrate 11 by the cavity 13.
- the infrared detection unit 20 is provided so as not to contact the substrate 11. Therefore, the infrared detection element 25 can suppress the heat of the infrared detection unit 20 from diffusing to the substrate 11 and has a structure with high thermal insulation with respect to the substrate 11.
- the first support part 30 ⁇ / b> A and the second support part 30 ⁇ / b> B are disposed at points symmetrical to each other with respect to the center of the infrared detection part 20. Note that the first support portion 30A and the second support portion 30B may be disposed at rotationally symmetric positions or line-symmetric positions.
- the planar view shapes of the first support portion 30A and the second support portion 30B are elongated linear shapes.
- the first support portion 30A and the second support portion 30B are not limited to a linear shape.
- the shape of the first support portion 30A and the second support portion 30B may be, for example, a bent shape such as an L shape.
- another support part may be provided.
- the other support parts are preferably arranged at positions symmetrical to each other with respect to the center of the infrared detection part 20.
- the infrared detection unit 20 is between the virtual line 1C and the virtual line 2C.
- the first support portion 30A Between the virtual line 2C and the virtual line 2D is the second support portion 30B.
- the imaginary line 1C is a line passing through the end face of the infrared absorption layer 17 on the first support portion 30A side.
- the virtual line 2C is a line passing through the end face of the infrared absorption layer 17 on the second support portion 30B side.
- the virtual line 1D is a line that passes through the end surface of the frame portion 14 that forms the cavity 13 on the first support portion 30A side.
- the virtual line 2D is a line that passes through the end surface of the frame portion 14 that forms the cavity 13 on the second support portion 30B side.
- the first support portion 30A includes a conductive first lower wiring 70A, a first insulating layer 16A, and a first upper wiring 80A, which are sequentially stacked.
- the first support portion 30A includes a first facing portion 35A in which the first lower wiring 70A and the first upper wiring 80A are opposed to each other in the stacking direction via the first insulating layer 16A.
- the second support portion 30B includes a conductive second lower wiring 70B, a second insulating layer 16B, and a second upper wiring 80B, which are sequentially stacked.
- the second support portion 30B includes a second facing portion 35B in which the second lower wiring 70B and the second upper wiring 80B are opposed to each other in the stacking direction via the second insulating layer 16B.
- the first upper wiring 80A, the upper electrode layer 50, and the second upper wiring 80B are provided in the same layer.
- the first insulating layer 16A, the detection layer 16, and the second insulating layer 16B are provided in the same layer.
- the first lower wiring 70A, the lower electrode layer 40, and the second lower wiring 70B are provided in the same layer.
- the first lower wiring 70A, the lower electrode layer 40, and the second lower wiring 70B are made of the same material.
- the first upper wiring 80A, the upper electrode layer 50, and the second upper wiring 80B are made of the same material.
- the first insulating layer 16A, the detection layer 16, and the second insulating layer 16B are made of the same material. Thereby, a manufacturing process can be simplified.
- the material of the first lower wiring 70A and the second lower wiring 70B may be different from the material of the lower electrode layer 40.
- the material of the first upper wiring 80A and the second upper wiring 80B may be different from the material of the upper electrode layer 50.
- the material of the first insulating layer 16A and the second insulating layer 16B may be different from the material of the detection layer 16.
- the stacked structure of the first support part 30 ⁇ / b> A and the second support part 30 ⁇ / b> B is preferably provided symmetrically with respect to the center of the infrared detection part 20.
- the first upper wiring 80A and the second upper wiring 80B are preferably made of the same material. Furthermore, the first upper wiring 80A and the second upper wiring 80B are preferably wirings having the same cross-sectional area.
- the first upper wiring 80A, the upper electrode layer 50, and the second upper wiring 80B are preferably provided in the same layer.
- the first lower wiring 70A and the second lower wiring 70B are preferably made of the same material.
- the first lower wiring 70A and the second lower wiring 70B are preferably wirings having the same cross-sectional area.
- the first lower wiring 70A, the lower electrode layer 40, and the second lower wiring 70B are preferably provided in the same layer. This makes it easy to balance the stress between the first support portion 30A and the second support portion 30B.
- One of the first upper wiring 80A and the second upper wiring 80B is an upper lead wiring.
- One of the first lower wiring 70A and the second lower wiring 70B is a lower lead wiring.
- the other of the first upper wiring 80A and the second upper wiring 80B is an upper dummy wiring.
- the other of the first lower wiring 70A and the second lower wiring 70B is a lower dummy wiring.
- the upper lead wire has one end in the extending direction of the upper lead wire connected to the first external lead portion 60A and the other end connected to the upper electrode layer 50.
- the lower lead wiring has one end in the extending direction of the lower lead wiring connected to the second external lead 60B and the other end connected to the lower electrode layer 40.
- the first upper wiring 80A of the first support portion 30A is the upper lead wiring. That is, the upper electrode layer 50 is connected to the first external lead portion 60A via the first upper wiring 80A.
- the second lower wiring 70B is a lower lead wiring. That is, the lower electrode layer 40 is connected to the second external lead portion 60B through the second lower wiring 70B.
- the first lower wiring 70A of the first support portion 30A is a lower dummy wiring.
- the second upper wiring 80B of the second support portion 30B is an upper dummy wiring.
- first lower wiring 70A one end portion on the side away from the infrared detection unit 20 in the extending direction of the first lower wiring 70A is provided in the frame portion 14.
- second upper wiring 80B one end portion on the side away from the infrared detection unit 20 in the extending direction of the second upper wiring 80B is provided in the frame portion 14.
- the first external lead portion 60A and the second external lead portion 60B have a rectangular shape having sides larger than the lead wiring width.
- the first external lead part 60A and the second external lead part 60B are connection ends for taking out an electrical signal from the infrared detection part 20 to the outside of the infrared detection element.
- 60 A of 1st external drawer parts and the 2nd external drawer part 60B are connected to the signal processing circuit which processes the electric signal output from the infrared detection part 20, for example.
- the first external lead portion 60A and the second external lead portion 60B are made of the same material as the first upper wiring 80A or the second lower wiring 70B.
- the first external lead portion 60A is formed on the first insulating layer 16A on the first support portion 30A side.
- the second external lead portion 60B is formed on the second lower wiring 70B.
- one end portion on the side away from the infrared detecting unit 20 in the wiring extending direction is the non-connected ends 90A and 90B. That is, the non-connected end 90A of the lower dummy wiring and the non-connected end 90B of the upper dummy wiring are provided so as not to be connected to the first external lead portion 60A and the second external lead portion 60B, respectively.
- the infrared detection element 25 does not take out the electrical signal of the infrared detection unit 20 via the non-connection ends 90A and 90B.
- the non-connecting end 90A of the lower dummy wiring is not overlapped with the first external lead 60A and the first support 30A in the stacking direction of the first support 30A.
- the non-connection end 90B of the upper dummy wiring is provided between the second external lead portion 60B and the second support portion 30B so as not to overlap the second external lead portion 60B in the stacking direction of the first support portion 30A. It has been. Thereby, dummy wiring can be shortened and wiring can be simplified.
- the capacitance between the lower dummy wiring and the first external lead portion 60A can be reduced. For this reason, since the contribution of the electrostatic capacity can be reduced at a location where the amount of received light around the infrared detection unit 20 is small, the responsiveness of the infrared detection element 25 can be improved.
- first lower wiring 70A may not have the non-connection end 90A.
- first lower wiring 70A functions not as a lower dummy wiring but as a lower lead wiring.
- the first lower wiring 70A and the second lower wiring 70B are connected to the second external lead portion 60B, respectively.
- the second upper wiring 80B may not have the non-connection end 90B.
- the second upper wiring 80B functions as an upper lead wiring, not as an upper dummy wiring.
- the first upper wiring 80A and the second upper wiring 80B are connected to the first external lead portion 60A, respectively.
- the first upper wiring 80A and the second upper wiring 80B can be connected to different first external lead portions.
- the lower lead wires can be connected to different second external lead portions.
- 4B is a cross-sectional view schematically showing a 4B-4B cross section of the first support portion 30A in FIG. 4C is a cross-sectional view schematically showing a 4C-4C cross section of the second support portion 30B in FIG.
- the 4B-4B cross section is a plane perpendicular to the extending direction of the first support portion 30A.
- the 4C-4C cross section is a plane perpendicular to the extending direction of the second support portion 30B.
- a first lower wiring 70A, a first insulating layer 16A, and a first upper wiring 80A are sequentially stacked on the intermediate layer 15 in the first support portion 30A.
- the first lower wiring 70A is a lower dummy wiring.
- the first upper wiring 80A is an upper lead wiring.
- a second lower wiring 70B, a second insulating layer 16B, and a second upper wiring 80B are sequentially stacked on the intermediate layer 15 in the second support 30B.
- the second lower wiring 70B is a lower lead wiring.
- the second upper wiring 80B is an upper dummy wiring.
- the first facing portion is provided over the entire extending direction of the first support portion 30A.
- the first facing portion 35A is provided in a part of the cross section of the first support portion 30A.
- the second facing portion is provided over the entire extending direction of the second support portion 30B.
- the second facing portion 35B is provided in a part of the cross section of the second support portion 30B.
- the non-connection end 90 ⁇ / b> A that is one end of the lower dummy wiring and the non-connection end 90 ⁇ / b> B that is one end of the upper dummy wiring are disposed on the frame portion 14 of the substrate 11. Further, the other end of the lower dummy wiring is connected to the lower electrode layer 40. The other end of the upper dummy wiring is connected to the upper electrode layer 50.
- a relatively large stress is easily applied to the base of the support portion 30 connected to the frame portion 14 of the substrate 11.
- the non-connecting end 90 ⁇ / b> A and the non-connecting end 90 ⁇ / b> B are provided on the frame portion 14 of the substrate 11, the upper wiring and the lower wiring are provided in the stacking direction at the base of the support portion 30.
- the base of the support part 30 can be reinforced and damage can be suppressed.
- the infrared absorption layer 17 provided on the upper layer of the infrared detection unit 20 absorbs infrared rays. By providing the infrared absorption layer 17, the sensitivity of infrared detection can be improved. As shown in FIG. 4A, the infrared absorption layer 17 covers the entire upper portion of the infrared detection unit 20. As a constituent material of the infrared absorption layer 17, SiO 2 or a metal black film can be used. The metal black film is a material called platinum black film or gold black film. In addition, the infrared absorption layer 17 or a protective film may be provided in the upper layer of a support part.
- a perovskite oxide ferroelectric material mainly composed of lead zirconate titanate (PZT) can be used as the pyroelectric material of the detection layer 16.
- PZT lead zirconate titanate
- Examples of the perovskite oxide ferroelectric include those obtained by substituting elements such as La, Ca, Sr, Nb, Mg, Mn, Zn or Al with PZT as a main component and a part of PZT elements.
- PZT is preferably oriented in the tetragonal (001) plane. Thereby, the infrared detection sensitivity can be increased.
- PMN chemical formula Pb (Mg 1/3 Nb 2/3 ) O 3
- PZN chemical formula Pb (Zn 1/3 Nb 2/3 ) O 3
- a semiconductor material such as Si, a metal material such as stainless steel, or a metal oxide such as MgO can be used.
- compressive stress due to thermal shrinkage can be added to the film to be formed in the process of forming the detection layer 16. Due to this compressive stress, the detection layer 16 is selectively oriented in the (001) direction, which is the polarization axis, so that a high pyroelectric coefficient ⁇ is obtained.
- the material of the substrate 11 is stainless steel mainly composed of iron or chromium.
- a stainless steel is, for example, SUS430.
- the linear thermal expansion coefficient of SUS430 is 10.5 ppm / K.
- the linear thermal expansion coefficient of PZT is 7.9 ppm / K. Therefore, the linear thermal expansion coefficient of the substrate 11 is larger than the linear thermal expansion coefficient of the detection layer 16.
- Examples of the material of the substrate 11 having a linear thermal expansion coefficient larger than that of the detection layer 16 include, in addition to stainless steel, a metal material, a single crystal material, a glass material, or a ceramic material.
- Examples of the metal material include Ti, Al, and Mg.
- the single crystal material is MgO, CaF 2 or the like.
- the glass material is borosilicate glass or the like.
- the ceramic material is TiO 2 , ZrO 2 or the like.
- an insulating material mainly composed of silicon oxide such as SiO 2 is used.
- silicon nitride such as SiN or silicon nitride film (SiON), or HfO 2 may be used.
- the lower electrode layer 40 is preferably made of a material mainly composed of lanthanum nickelate (LaNiO 3 , hereinafter referred to as “LNO”).
- LNO lanthanum nickelate
- LNO having a perovskite structure is an oxide having metallic electrical conductivity.
- the resistivity at room temperature is approximately 1 ⁇ 10 ⁇ 3 ( ⁇ ⁇ cm).
- the material mainly composed of LNO includes a material in which a part of nickel is replaced with another metal.
- the other metal includes at least one metal selected from the group consisting of iron, aluminum, manganese, and cobalt.
- the lower electrode layer 40 made of an LNO-based material is formed using various known film formation methods such as a vapor phase growth method such as a sputtering method or a hydrothermal synthesis method.
- the material of the upper electrode layer 50 a metal such as Au, Ti, Al, Pt, Cr, or an alloy containing at least one of them can be used.
- the upper electrode layer 50 is composed of a single layer of these metals.
- the upper electrode layer 50 may be comprised with the laminated body which the several layer containing these metals laminated
- the upper electrode layer 50 may be a stacked body in which Ti and Au are sequentially stacked.
- the film thickness of the upper electrode layer 50 is preferably in the range of 5 to 500 nm.
- a laminated film is formed on the substrate 11 in which no cavity is formed.
- the laminated film is a film laminated on the substrate 11 in the order of the intermediate layer 15, the lower electrode film, the detection film, the upper electrode film, and the infrared absorption layer 17.
- a silicon oxide precursor solution is applied on the substrate 11 to form a silicon oxide precursor film. Then, the silicon oxide precursor film is densified by heating to form a silicon oxide intermediate layer 15. Subsequently, an LNO precursor solution is applied on the intermediate layer 15 to form an LNO precursor film. Then, the lower conductive film is formed by rapidly heating and crystallizing the LNO precursor film.
- a mask corresponding to the lower electrode layer 40, the first lower wiring 70A, and the second lower wiring 70B is formed on the lower conductive film by using a photolithography method or the like. Then, after patterning the lower conductive film using a dry etching method or a wet etching method, the mask is removed. Thus, the lower electrode layer 40, the first lower wiring 70A, and the second lower wiring 70B are formed. That is, the lower electrode layer 40, the first lower wiring 70A, and the second lower wiring 70B have the same thickness, are made of the same material, and are formed in the same layer.
- a PZT precursor solution is applied on the main surface of the substrate 11 including the lower electrode layer 40, the first lower wiring 70A, and the second lower wiring 70B to form a PZT precursor film. Then, the PZT precursor film is heated to crystallize the PZT precursor film, thereby forming a PZT film.
- the detection film of the laminated film is a PZT film.
- an upper conductive film is formed on the detection layer 16, the first insulating layer 16A, and the second insulating layer 16B by a dry process such as ion sputtering.
- a dry process such as ion sputtering.
- the upper electrode layer 50, the first upper wiring 80A, the second upper wiring 80B, the first external lead portion 60A and the second external lead portion 60B are formed. That is, the upper electrode layer 50, the first upper wiring 80A, and the second upper wiring 80B have the same thickness, are made of the same material, and are formed in the same layer.
- an infrared absorption layer 17 is formed on the detection layer by a plasma CVD method. In this way, the laminated film is formed.
- the first external lead portion and the second external lead portion are exposed using an etching method such as wet etching or dry etching. Thereafter, after exposing a part of the substrate to be the opening, wet etching is further performed until the back surface of the intermediate layer 15 is separated from the surface of the substrate 11. Thereby, the cavity 13 is formed in the main surface of the substrate 11. In this way, the infrared detection element 25 is manufactured.
- an etching method such as wet etching or dry etching.
- a disconnection portion is provided in the infrared detection portion or the support portion.
- the same reference numerals are used for the same components as those of the infrared detection element according to the first embodiment, and detailed description thereof is omitted.
- the upper disconnection part is provided in at least one of the support part provided with the upper dummy wiring and the infrared detection part.
- the upper dummy wiring is provided in any one of the first support portion and the second support portion.
- the upper disconnection portion electrically insulates one end portion of the upper dummy wiring from the upper electrode layer.
- the lower disconnection part is provided in at least one of the support part and the infrared detection part provided with the lower dummy wiring.
- the lower dummy wiring is provided in any one of the first support portion and the second support portion. The lower disconnection portion electrically insulates one end portion of the lower dummy wiring from the lower electrode layer.
- FIG. 5 is a top view schematically showing the infrared detecting element 26 in the second embodiment.
- FIG. 6 is a cross-sectional view schematically showing a 6-6 cross section of the infrared detecting element 26 in FIG.
- the first upper wiring 81A disposed on the first support portion 31A is an upper lead wiring.
- the first lower wiring 71A is a lower dummy wiring.
- the second upper wiring 81B disposed on the second support portion 31B is an upper dummy wiring.
- the second lower wiring 71B is a lower lead wiring.
- the infrared detection element 26 has an upper disconnection portion 101B that electrically insulates one end portion on the side away from the infrared detection portion 21 in the extending direction of the second upper wiring 81B and the upper electrode layer 51 from each other.
- the infrared detection element 26 has a lower disconnection portion 101A that electrically insulates one end portion on the side away from the infrared detection portion 21 in the extending direction of the first lower wiring 71A and the lower electrode layer 41 from each other.
- the upper disconnection part 101B is provided in the infrared detection part 21 adjacent to the second support part 31B. Due to the upper disconnection portion 101B, the end portion of the upper dummy wiring is disposed at a distance from the upper electrode layer 51 (the interval between the virtual line 2C and the virtual line 2E).
- the imaginary line 2E is a line passing through the end surface of the upper electrode layer 51 on the second support portion 31B side.
- the lower disconnection part 101A is provided in the infrared detection part 21 adjacent to the first support part 31A. Due to the lower disconnection portion 101A, the end portion of the lower dummy wiring is disposed at a distance from the lower electrode layer 41 (the interval between the virtual line 1C and the virtual line 1E).
- the virtual line 1E is a line passing through the end surface of the upper electrode layer 51 on the first support portion 31A side.
- the other ends of the upper dummy wiring and the lower dummy wiring are provided at the bases of the second support part 31B and the first support part 31A on the infrared detection part 21 side, respectively.
- One end of the upper dummy wiring and the lower dummy wiring is provided in the frame portion 14. Note that one end portion of the upper dummy wiring and the lower dummy wiring may not be provided in the frame portion 14.
- the infrared detection unit 21 By providing at least one of the upper disconnection portion 101B and the lower disconnection portion 101A, it is possible to suppress the heat generated in the infrared detection unit 21 from diffusing to the substrate 11 through the conductive dummy wiring. Thereby, in the infrared detection element 26, the infrared detection sensitivity can be improved.
- the electrostatic capacitance generated between the dummy wiring and the wiring facing the dummy wiring in the stacking direction due to the upper disconnection portion 101B and the lower disconnection portion 101A does not contribute to the electrostatic capacitance of the infrared detection unit 21. Therefore, the contribution of the electrostatic capacity can be reduced at a location where the amount of received light around the infrared detection unit 21 is small. Therefore, the infrared detection sensitivity of the infrared detection element 26 can be increased.
- the distance between the upper electrode layer 51 and the second upper wiring 81B is preferably in the range of 2 ⁇ m to 10 ⁇ m.
- the distance between the lower electrode layer 41 and the first lower wiring 71A is preferably in the range of 2 ⁇ m to 10 ⁇ m.
- FIG. 7 is a top view schematically showing another infrared detection element 27.
- the upper disconnection part 102B is provided at the other end of the second upper wiring 82B on the infrared detection part 20 side.
- the second upper wiring 82B is an upper dummy wiring.
- a lower disconnection portion (not shown) is provided at the other end portion on the infrared detection portion 20 side of the first lower wiring.
- the first support portion 32A is a lower dummy wiring.
- the upper disconnection portion 102B may be provided in the middle of the second upper wiring 82B.
- the lower disconnection part may be provided in the middle of the first lower wiring.
- FIG. 8 is a top view schematically showing still another infrared detection element 28.
- the upper disconnection part 103B is provided in the infrared detection part 23. Further, the upper dummy wiring extends to the infrared detection unit 23. That is, the other end of the upper dummy wiring is provided in the infrared detection unit 23.
- a rectangular upper notch 105B in which a part of the upper electrode layer 53 is notched is provided on the second support part 33B side of the infrared detection part 23.
- the second upper wiring 83 ⁇ / b> B extends to the infrared detection unit 23.
- the second upper wiring 83B is an upper dummy wiring. That is, the upper dummy wiring is arranged from the second support portion 33B to a part of the upper cutout portion 105B of the infrared detection unit 23.
- a lower lead wiring, a pyroelectric body, and an upper dummy wiring are sequentially stacked.
- a lower disconnection portion (not shown) is provided in the infrared detection unit 23.
- the lower dummy wiring extends to the infrared detection unit 23. That is, the end portion of the lower dummy wiring is provided in the infrared detection unit 23.
- a lower notch (not shown) is provided in the lower electrode layer on the first support portion 33 ⁇ / b> A side of the infrared detection unit 23.
- the lower dummy wiring which is the first lower wiring, is arranged from the first support portion 33A to a part of the lower notch portion of the infrared detection unit 23.
- a lower dummy wiring, a pyroelectric body, and an upper lead wiring are sequentially stacked in a part of the lower notch.
- the second upper wiring 83B and the lower wiring are provided in the stacking direction. Therefore, the root of the second support portion 33B is reinforced by the wiring layer, and damage to the root can be suppressed.
- the upper disconnection part 103 ⁇ / b> B in the infrared detection unit 23 thermal diffusion from the infrared detection unit 23 to the substrate 11 can be suppressed.
- the first support portion 33A also has the same effect as the second support portion 33B.
- the upper notch part and the lower notch part may not be provided.
- the upper lead wiring and the lower lead wiring are respectively disposed on the first support portion 30A and the second support portion 30B.
- the upper lead wiring and the lower lead wiring are arranged on the same support portion of either the first support portion or the second support portion.
- FIG. 9 is a top view schematically showing the infrared detection element 29 in the third embodiment.
- the first external lead portion 61A and the second external lead portion 61B are provided on the frame portion 14 on the first support portion 30A side.
- a first upper wiring 84A and a first lower wiring 74A are disposed on the first support portion 30A.
- the first upper wiring 84A is connected to the first external lead 61A.
- the first lower wiring 74A is connected to the second external lead 61B. That is, in the first support portion 30A, the first upper wiring 84A is an upper lead wiring.
- the first lower wiring 74A is a lower lead wiring.
- the second support portion 30B is provided with a second upper wiring 84B and a second lower wiring (not shown).
- the second upper wiring 84B is an upper dummy wiring.
- the second lower wiring is a lower dummy wiring.
- the upper disconnection portion 104B and the lower disconnection portion overlap in the stacking direction.
- the upper disconnection portion 104B and the lower disconnection portion may be displaced in a top view.
- FIG. 10 is a block diagram showing the configuration of the infrared detecting device 99. As shown in FIG.
- the infrared detection device 99 illustrated in FIG. 10 is an example of an infrared detection device including the infrared detection element 25, and is not limited thereto.
- the optical system block 92 includes an optical member 93 such as a lens that collects incident infrared rays and a filter that selectively transmits infrared rays.
- the incident infrared ray 96 is received by the infrared sensor 94 via the optical system block 92.
- the infrared ray 96 is a reflected light of an infrared beam irradiated on an object such as a human body, an infrared beam shielded by movement of the object, an infrared ray emitted from a person, or the like.
- the infrared sensor 94 has an infrared detection element 25.
- the infrared detection element 25 may be singular or plural.
- the plurality of infrared detection elements are arranged in a two-dimensional matrix, for example.
- the plurality of infrared detection elements may be arranged in a line.
- a lens array may be used as the optical member 93 corresponding to each infrared detection element.
- the signal processing circuit 95 includes an amplification circuit that amplifies the output signal of the infrared detection element, an analog-digital conversion circuit, and the like. An output signal of the infrared detection element is input to the signal processing circuit 95.
- the signal processing circuit 95 outputs an object detection signal, an object movement signal, an operation signal, an image signal, a temperature signal, and the like by processing the output signal of the infrared detection element.
- the infrared detection device 99 may use a control circuit and a tuning amplifier circuit for controlling the chopper when the incident light is modulated by a chopper or the like.
- the infrared detection device 99 may include a lamp that indicates object detection, a monitor that displays an image signal, a recording medium such as a memory that records a temperature signal, and the like.
- the infrared detection element and the infrared detection device have been described based on the embodiment, but the present disclosure is not limited to this embodiment. Unless it deviates from the gist of the present disclosure, various modifications conceived by those skilled in the art have been made in this embodiment, and forms constructed by combining components in different embodiments are also within the scope of one or more aspects. May be included.
- the infrared detection element of the present disclosure is useful for applications of electronic devices such as human sensors, infrared cameras, thermography, and night vision.
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Abstract
Description
図1は、実施の形態1における赤外線検出素子25を模式的に示す上面図である。図2は、図1における赤外線検出素子25の2-2断面を模式的に示す断面図である。図3は、実施の形態1における赤外線検出素子25の下部配線の配設を模式的に示す上面図である。
実施の形態2の赤外線検出素子には、赤外線検出部又は支持部に断線部が設けられている。実施の形態2にかかる赤外線検出素子において、実施の形態1の赤外線検出素子と同一構成には同一符号を用い詳細な説明を省略する。
実施の形態1の赤外線検出素子25において、上部引出配線及び下部引出配線は、第1支持部30A及び第2支持部30Bにそれぞれ配設されている。これに対し、実施の形態3の赤外線検出素子は、上部引出配線と下部引出配線とが、第1支持部及び第2支持部のどちらか一方の同じ支持部に配設されたものである。
図10は、赤外線検出装置99の構成を示すブロック図である。図10に示す赤外線検出装置99は、赤外線検出素子25を備える赤外線検出装置の一例であり、これに限定されない。
13 空洞
14 枠部
15 中間層
16 検出層
16A 第1絶縁層
16B 第2絶縁層
17 赤外線吸収層
20、21、23 赤外線検出部
25、26、27、28、29 赤外線検出素子
30 支持部
30A、31A、32A、33A 第1支持部
30B、31B、32B、33B 第2支持部
35A 第1対向部
35B 第2対向部
40、41 下部電極層
50、51、53 上部電極層
60A、61A 第1外部引出部
60B、61B 第2外部引出部
70A、71A、74A 第1下部配線
70B、71B 第2下部配線
80A、81A、84A 第1上部配線
80B、81B、82B、83B、84B 第2上部配線
90A、90B 非接続端
92 光学系ブロック
93 光学部材
94 赤外線センサ
95 信号処理回路
96 赤外線
99 赤外線検出装置
101A 下部断線部
101B、102B、103B、104B 上部断線部
105B 上部切り欠き部
Claims (11)
- 空洞を有する基板と、
下部電極層と検出層と上部電極層とが順に積層された赤外線検出部と、
前記空洞の上方に前記赤外線検出部を支持する第1支持部及び第2支持部と、
前記赤外線検出部から出力される電気信号を外部に取り出すための第1外部引出部及び第2外部引出部と、を備え、
前記第1支持部は、順に積層された第1下部配線と第1絶縁層と第1上部配線とを備え、
前記上部電極層は、前記第1上部配線を介して前記第1外部引出部と接続されており、
前記第2支持部は、順に積層された第2下部配線と第2絶縁層と第2上部配線とを備え、
前記下部電極層は、前記第2下部配線を介して前記第2外部引出部と接続されている
赤外線検出素子。 - 前記基板は、前記空洞を形成する枠部を有し、
前記第1下部配線において、前記第1下部配線の延在方向における前記赤外線検出部から離れた側の一方の端部は、前記枠部に設けられ、
前記第2上部配線において、前記第2上部配線の延在方向における前記赤外線検出部から離れた側の一方の端部は、前記枠部に設けられる、
請求項1に記載の赤外線検出素子。 - 前記赤外線検出素子は、さらに前記第2上部配線の延在方向における前記赤外線検出部から離れた側の一方の端部と前記上部電極層とを電気的に絶縁する上部断線部を有する、
請求項1又は2に記載の赤外線検出素子。 - 前記上部断線部は、前記第2上部配線の他方の端部に設けられる、
請求項3に記載の赤外線検出素子。 - 前記上部断線部は、前記赤外線検出部に設けられる、
請求項3に記載の赤外線検出素子。 - 前記赤外線検出素子は、さらに前記第1下部配線の延在方向における前記赤外線検出部から離れた側の一方の端部と前記下部電極層とを電気的に絶縁する下部断線部を有する、
請求項1~5の何れか1項に記載の赤外線検出素子。 - 前記下部断線部は、前記第1下部配線の他方の端部に設けられる、
請求項6に記載の赤外線検出素子。 - 前記下部断線部は、前記赤外線検出部に設けられる、
請求項6に記載の赤外線検出素子。 - 前記第1上部配線と前記上部電極層と前記第2上部配線とは、同層に設けられ、
前記第1絶縁層と前記検出層と前記第2絶縁層とは、同層に設けられ、
前記第1下部配線と前記下部電極層と前記第2下部配線とは、同層に設けられる、
請求項1~8の何れか1項に記載の赤外線検出素子。 - 前記第1上部配線と前記上部電極層と前記第2上部配線とは、同じ材料で構成され、
前記第1絶縁層と前記検出層と前記第2絶縁層とは、同じ材料で構成され、
前記第1下部配線と前記下部電極層と前記第2下部配線とは、同じ材料で構成される、
請求項1~9の何れか1項に記載の赤外線検出素子。 - 請求項1~10の何れか1項に記載の赤外線検出素子を備える赤外線検出装置。
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US14/915,509 US9423304B2 (en) | 2014-03-27 | 2015-03-13 | Infrared ray detecting element and infrared ray detector including the same |
JP2016509985A JP6249381B2 (ja) | 2014-03-27 | 2015-03-13 | 赤外線検出素子及びこれを備える赤外線検出装置 |
CN201580001805.0A CN105556261B (zh) | 2014-03-27 | 2015-03-13 | 红外线检测元件以及具备它的红外线检测装置 |
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US9423304B2 (en) | 2016-08-23 |
US20160216159A1 (en) | 2016-07-28 |
CN105556261A (zh) | 2016-05-04 |
JPWO2015146054A1 (ja) | 2017-04-13 |
CN105556261B (zh) | 2018-08-24 |
JP6249381B2 (ja) | 2017-12-20 |
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