WO2007058010A1 - 半導体圧力センサおよびその製造方法 - Google Patents
半導体圧力センサおよびその製造方法 Download PDFInfo
- Publication number
- WO2007058010A1 WO2007058010A1 PCT/JP2006/317053 JP2006317053W WO2007058010A1 WO 2007058010 A1 WO2007058010 A1 WO 2007058010A1 JP 2006317053 W JP2006317053 W JP 2006317053W WO 2007058010 A1 WO2007058010 A1 WO 2007058010A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure sensor
- insulating layer
- semiconductor pressure
- semiconductor
- silicon
- Prior art date
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 61
- 230000002093 peripheral effect Effects 0.000 claims abstract description 15
- 230000007423 decrease Effects 0.000 claims abstract description 5
- 238000001312 dry etching Methods 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 59
- 229910052710 silicon Inorganic materials 0.000 abstract description 59
- 239000010703 silicon Substances 0.000 abstract description 59
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 58
- 229910052814 silicon oxide Inorganic materials 0.000 description 58
- 238000005259 measurement Methods 0.000 description 27
- 230000008859 change Effects 0.000 description 18
- 238000005530 etching Methods 0.000 description 13
- 229910052581 Si3N4 Inorganic materials 0.000 description 12
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 239000011521 glass Substances 0.000 description 10
- 230000001681 protective effect Effects 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- 238000001039 wet etching Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052594 sapphire Inorganic materials 0.000 description 3
- 239000010980 sapphire Substances 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- PRERWTIRVMYUMG-UHFFFAOYSA-N hydroxymethyl(trimethyl)azanium Chemical compound C[N+](C)(C)CO PRERWTIRVMYUMG-UHFFFAOYSA-N 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/84—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by variation of applied mechanical force, e.g. of pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0042—Constructional details associated with semiconductive diaphragm sensors, e.g. etching, or constructional details of non-semiconductive diaphragms
- G01L9/0047—Diaphragm with non uniform thickness, e.g. with grooves, bosses or continuously varying thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/04—Means for compensating for effects of changes of temperature, i.e. other than electric compensation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0042—Constructional details associated with semiconductive diaphragm sensors, e.g. etching, or constructional details of non-semiconductive diaphragms
- G01L9/0048—Details about the mounting of the diaphragm to its support or about the diaphragm edges, e.g. notches, round shapes for stress relief
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0051—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance
- G01L9/0052—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance of piezoresistive elements
- G01L9/0054—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance of piezoresistive elements integral with a semiconducting diaphragm
Definitions
- the present invention relates to a semiconductor pressure sensor and a method of manufacturing the same.
- Japanese Patent Laid-Open No. 4-9770 discloses a semiconductor pressure sensor constituted by three layers of a silicon thin plate, an insulating layer, and a silicon support substrate. In this semiconductor pressure sensor, a through hole is formed in the silicon support substrate, and a through hole continuing to the through hole is formed in the insulating layer.
- a through hole is formed in a silicon support substrate. A through hole is not formed in an insulating layer, and an insulating layer is formed as an SOI (Silicon On Insulator) substrate.
- SOI Silicon On Insulator
- any of the semiconductor pressure sensors described above functions as a diaphragm that is deformed by a silicon thin plate force pressure located on an extension line of a through hole provided in a silicon support substrate.
- Patent Document 1 JP-A-4 9770
- Patent Document 2 Japanese Patent Laid-Open No. 2002-350259
- the semiconductor pressure sensor disclosed in the above Japanese Laid-Open Patent Publication No. 4-9770 has a structure in which the insulating layer does not exist in the lower region of the diaphragm but exists in the other regions. Have. According to this structure, since a region where the insulating layer exists and a region where the insulating layer does not exist are mixed, there is a possibility that residual stress is generated in the diaphragm. In addition, when the temperature of the ambient environment of the semiconductor pressure sensor changes, stress is generated in the diaphragm due to the difference between the thermal expansion coefficient of the insulating layer and the thermal expansion coefficient of silicon. As a result, measurement errors due to temperature changes in the surrounding environment occur.
- the semiconductor pressure sensor disclosed in Japanese Patent Application Laid-Open No. 2002-350259 has a structure in which an insulating layer having a uniform thickness remains in a lower region of the diaphragm. According to this structure, the error in pressure measurement due to the difference between the thermal expansion coefficient of the insulating layer and the thermal expansion coefficient of silicon is reduced. However, the stress generated in the insulating layer causes distortion in the diaphragm. In other words, the diaphragm is deformed by factors other than the pressure applied to the diaphragm from the outside. For this reason, even when no pressure is applied to the diaphragm, the output voltage value of the semiconductor pressure sensor force does not become zero. That is, an offset occurs in the output voltage value. Therefore, a measurement error due to the offset voltage occurs.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to reduce a semiconductor body pressure in which both a measurement error due to an offset voltage and a measurement error due to a temperature change in the surrounding environment are reduced. It is to provide a sensor and a manufacturing method thereof.
- a semiconductor pressure sensor of the present invention includes a semiconductor support substrate in which a through-hole extending in the thickness direction is formed, and a semiconductor thin plate positioned above the semiconductor support substrate.
- the pressure sensor includes an insulating layer sandwiched between a semiconductor support substrate and a semiconductor thin plate.
- the insulating layer has a recess at a position facing the through hole, and the thickness at the position of the recess is reduced from the peripheral portion toward the central portion.
- an intermediate structure including a semiconductor support substrate, an insulating layer provided on the semiconductor support substrate, and a semiconductor thin plate formed on the insulating layer.
- the body is prepared.
- a through hole extending in the thickness direction is formed in the semiconductor support substrate.
- a recess is formed in the insulating layer.
- the concave portion is formed such that the thickness of the insulating layer at the position facing the through hole is reduced from the peripheral portion toward the central portion.
- FIG. 1 is a schematic sectional view of a semiconductor pressure sensor according to an embodiment.
- FIG. 2 is a graph for comparing the characteristics of the semiconductor pressure sensor of the embodiment and the characteristics of a conventional semiconductor pressure sensor.
- FIG. 3 is a schematic sectional view for illustrating the method for manufacturing the semiconductor pressure sensor according to the embodiment.
- FIG. 4 is a schematic sectional view for illustrating the method for manufacturing the semiconductor pressure sensor according to the embodiment.
- FIG. 5 is a schematic sectional view for illustrating the method for manufacturing the semiconductor pressure sensor according to the embodiment.
- FIG. 6 is a schematic sectional view for illustrating the method for manufacturing the semiconductor pressure sensor according to the embodiment.
- FIG. 7 is a schematic sectional view for illustrating the method for manufacturing the semiconductor pressure sensor according to the embodiment.
- FIG. 8 is a schematic sectional view for illustrating the method for manufacturing the semiconductor pressure sensor according to the embodiment.
- FIG. 9 is a schematic sectional view of a silicon oxide film formed by wet etching.
- FIG. 10 is a graph showing the relationship between the etching time of the silicon oxide film and the measurement error of the semiconductor pressure sensor.
- FIG. 11 is a schematic cross-sectional view showing the thickness distribution of a silicon oxide film.
- FIG. 12 is a graph showing the relationship between the distribution shape of the silicon oxide film thickness and the measurement error of the semiconductor pressure sensor.
- FIG. 13 is a schematic cross-sectional view of another example of the semiconductor pressure sensor according to the embodiment.
- FIG. 14 is a graph showing the relationship between the breakdown pressure of the diaphragm and the amount of undercut. Explanation of symbols
- FIG. 1 is a cross-sectional view of a semiconductor pressure sensor according to an embodiment.
- the semiconductor pressure sensor includes a glass substrate 8 as a sealing substrate, a silicon support substrate 1 as a semiconductor support substrate formed on the glass substrate 8, and a silicon as an insulating layer formed on the silicon support substrate 1. And a silicon thin plate 3 as a semiconductor thin plate (active layer) formed on the silicon oxide film 2.
- a three-layer structure composed of a silicon support substrate 1, an insulating layer 2, and a silicon thin plate 3 is generally called SOI (Silicon On Insulator).
- the glass substrate 8 When the glass substrate 8 is provided in the semiconductor pressure sensor as described above, the glass substrate 8, the inner surface of the through hole of the silicon support substrate 1, and the silicon thin plate 3 are used as described later. Since the sealed space functions as a pressure reference chamber, absolute pressure can be measured. On the other hand, the semiconductor pressure sensor is used as a differential pressure sensor for detecting the differential pressure on both surfaces of the diaphragm 23 when the glass substrate 8 is not provided.
- SOS Silicon On Sapphire
- sapphire is used as the insulating layer instead of the silicon oxide film.
- the semiconductor thin plate, the insulating layer, and the semiconductor support substrate of the present invention a silicon thin plate, a silicon oxide film, and a silicon support substrate are used.
- a silicon carbide thin plate, a silicon carbide, and the like are used.
- An insulating film and a silicon carbide supporting substrate may be used. That is, a semiconductor other than silicon may be used as a semiconductor constituting the semiconductor pressure sensor.
- the silicon support substrate 1 is formed with a through hole la reaching the silicon oxide film 2. Therefore, the silicon oxide film 2 faces the space 10 in the through hole la.
- the silicon thin plate 3 and the silicon oxide film 2 located on the extension line of the through hole la are thin plate portions. This thin plate portion functions as a diaphragm 23 that is distorted due to the difference between the pressure in the space above the silicon thin plate 3 and the pressure in the space 10 in the through hole la. To do.
- a strain gauge 4 is formed on the silicon thin plate 3.
- the strain gauge 4 is distorted in proportion to the sag of the diaphragm 23 when pressure is applied to the diaphragm 23 and the diaphragm 23 is squeezed.
- the strain gauge 4 is distorted, its resistance value changes.
- the resistance value of the strain gauge 4 changes in proportion to its own strain amount. Therefore, if a voltage is applied across the strain gauge 4, the voltage across the strain gauge 4 changes in proportion to the strain amount of the strain gauge 4. Therefore, if the amount of change in the voltage across the strain gauge 4 is detected, the pressure applied to the diaphragm 23 is detected.
- an insulating protective film 5 is formed on the silicon thin plate 3.
- a hole 5 a is formed on the insulating protective film 5, and the bottom surface of the hole 5 a is formed from the upper surface of the strain gauge 4.
- aluminum wiring 6 is embedded in the hole 5a. The aluminum wiring 6 extends on the insulating protective film 5. The end of the aluminum wiring 6 functions as a pad for connection to an external electrode.
- the space 10 surrounded by the upper surface of the glass substrate 8, the inner peripheral surface of the through hole la, and the lower surface of the insulating layer 2 is a pressure reference. It functions as a room. That is, the present embodiment is an absolute pressure sensor, and the space 10 as a pressure reference chamber is a sealed space, and the pressure in the space 10 is maintained at a predetermined reference pressure.
- the semiconductor pressure sensor has the following effects even when the glass substrate 8 is not provided and is used as a differential pressure sensor for detecting the pressure difference between both surfaces of the diaphragm 23. Yes.
- the strain gauge 4 In general, in the semiconductor pressure sensor as described above, only the strain amount of the diaphragm 23 caused by the difference between the pressure outside the diaphragm 23 and the pressure in the space 10 inside the diaphragm 23 is detected by the strain gauge 4. Ideally. However, other factors may cause the diaphragm 23 to be distorted. Distortion due to other factors becomes a measurement error of the semiconductor pressure sensor. In the conventional semiconductor pressure sensor, the force that the silicon oxide film remains on the lower side of the silicon thin plate with a uniform thickness, or the silicon oxide film on the lower side of the diaphragm is completely removed. As a result, the aforementioned measurement error occurs.
- the semiconductor pressure sensor of the present embodiment In this case, under the diaphragm 23, the silicon oxide film 2 remains over the entire surface of one end of the through hole la, and the film thickness of the silicon oxide film 2 changes from the peripheral part to the center part. The lower part of the silicon oxide film 2 is removed so that it gradually decreases with the force. This reduces both measurement errors due to offset voltage and measurement errors due to temperature changes.
- the effect obtained by the semiconductor pressure sensor of the present embodiment will be described using the measurement result.
- FIG. 2 shows the offset voltage and the amount of fluctuation of the output voltage caused by the temperature change of the two conventional semiconductor pressure sensors, and the offset voltage and temperature of the semiconductor pressure sensor of the present embodiment. The relationship with the amount of change in the output voltage due to the change is shown.
- a conventional semiconductor pressure sensor A has the structure of a semiconductor pressure sensor disclosed in Japanese Patent Laid-Open No. 4-9770, and a conventional semiconductor pressure sensor B is disclosed in Japanese Patent Laid-Open No. 2002-350259. Have a semiconductor pressure sensor structure! / Speak.
- an SOI substrate comprising a silicon thin plate 3Z silicon oxide film 2Z silicon support substrate 1 is prepared.
- a strain gauge 4 is formed on the silicon thin plate 3 of the SOI substrate.
- the strain gauge 4 is composed of an impurity region diffused by applying a main surface force of the silicon thin plate 3 to a predetermined depth.
- an impurity constituting the strain gauge 4 for example, boron is used. Further, this impurity is formed in the silicon thin plate 3 by a thermal diffusion method and an ion implantation method.
- the insulating protective film 5 is formed.
- the insulating protective film 5 is preferably a silicon nitride film, for example.
- the insulating protective film 5 located above the strain gauge 4 is removed by etching. As a result, the strain gauge 4 is exposed on the bottom surface of the hole 5a formed in the insulating protective film 5.
- an aluminum wiring 6 is formed that fills the hole 5 a and covers a part of the upper surface of the insulating protective film 5. Thereby, the aluminum wiring 6 and the strain gauge 4 are electrically connected.
- the structure obtained by the above process is shown in FIG.
- the aluminum wiring 6 is etched into a predetermined pattern, and the tip of the aluminum wiring 6 becomes an electrode node (not shown). Therefore, the semiconductor pressure sensor can be electrically connected to the external voltage applying means via the electrode pad.
- a silicon nitride film 7 is formed on the main surface of the silicon support substrate 1 by a CVD method. Then, plasma etching using reactive gas such as CF or CHF
- the silicon support substrate 1 is etched using the silicon nitride film 7 as a mask. As a result, a through hole la is formed in the silicon support substrate 1 and the lower surface of the silicon oxide film 2 is exposed.
- the resulting structure is shown in FIG.
- the cross section of the through hole la parallel to the main surface of the silicon support substrate 1 may be any shape such as a square and a circle.
- the through hole la gradually becomes thinner from the silicon nitride film 7 to the insulating layer 2 according to the direction force.
- TMAH hydroxyl tetramethylammonium
- a dry etching method using is suitable. In either method, an etchant having a large selection ratio of the silicon support substrate 1 to the silicon nitride film 7 and the silicon oxide film 2 is used. That is, an etchant having an extremely high etching rate of the silicon support substrate 1 with respect to the etching rate of the silicon nitride film 7 and the silicon oxide film 2 is used.
- the silicon oxide film 2 is dry-etched to form a recess 2 a in the silicon oxide film 2.
- the on-milling method is suitable.
- the cross-sectional shape of the silicon oxide film 2 obtained by dry etching has different forces depending on the gas pressure and substrate bias voltage during etching and the substrate tilt angle. It is formed in a cross-sectional shape as shown in FIG. In other words, the silicon oxide film 2 is gradually thinned from the peripheral edge of the diaphragm 23 toward the center so that the recess 2a formed in the silicon oxide film 2 becomes almost a part of a spherical surface. ing.
- the silicon oxide film 2 is etched by wet etching using a hydrofluoric acid solution, the silicon oxide film 2 is formed in the cross-sectional shape shown in FIG. In other words, the thickness of the silicon oxide film 2 extends almost in parallel with the silicon thin plate 3 with a constant thickness.
- the effect obtained by the semiconductor pressure sensor of the present embodiment that is, the measurement error due to the offset voltage and the measurement error due to the temperature change It is difficult to obtain the effect of reducing the amount of light.
- the silicon nitride film 7 is removed, and the glass substrate 8 is anodically bonded onto the lower surface of the silicon support substrate 1 in order to produce an absolute pressure sensor.
- the silicon nitride film 7 does not necessarily have to be removed. However, if the silicon nitride film 7 is removed when the silicon support substrate 1 and the glass substrate 8 are anodic bonded, the silicon support substrate 1 The reliability of bonding with the glass substrate 8 is improved.
- wet etching using a hot phosphoric acid solution is suitable.
- the relationship between the sum of the offset voltage and the amount of fluctuation of the output voltage caused by the temperature change and the etching time of the silicon oxide film was plotted as shown in FIG. Note that, in the graph shown in FIG. 10, the conventional silicon oxide film is completely etched, so that the semiconductor pressure sensor having the structure, that is, the semiconductor pressure sensor disclosed in Japanese Patent Laid-Open No. 2002-350259 is used. Is used as a reference. More specifically, the offset voltage standardized by the offset voltage of the semiconductor pressure sensor disclosed in JP-A-2002-350259 and the semiconductor pressure disclosed in JP-A-2002-350259 are disclosed. Caused by temperature changes normalized by the amount of output voltage fluctuation due to sensor temperature changes. The amount of fluctuation in output voltage is used.
- the measurement error of the semiconductor pressure sensor is smaller as the fluctuation amount of the output voltage due to the offset voltage and the temperature change is smaller. Therefore, in the evaluation using the graph shown in FIG. 10 described above, the smaller the sum of the normalized offset voltage and the output voltage variation due to the normalized temperature change, the smaller the semiconductor pressure sensor. Small measurement error.
- FIG. 10 shows that if the etching time of the silicon oxide film 2 is made too long, the measurement error of the semiconductor pressure sensor tends to increase. The reason for this tendency is that if the etching time is too long, the silicon oxide film 2 is completely removed in the central region of the diaphragm 23 and the lower surface of the silicon thin plate 3 is exposed.
- the silicon oxide film 2 used for the evaluation shown in FIG. 10 has a thickness force SO. Before being etched.
- the thickness of the silicon oxide film 2 from the end 2b of the region where the film thickness of the silicon oxide film 2 is the maximum value Tmax is (Tmax + Tmin) ⁇ 2 It is defined that the distance to position 2c is A.
- Figure 12 shows the ratio of the distance A to the maximum value Tmax, A ⁇ Tmax, and the offset voltage and temperature. The relationship with the sum of the fluctuation amount of the output voltage caused by the change is shown.
- the silicon oxide film 2 removal amount is fixed to the silicon oxide film removal amount corresponding to the etching time of 4 minutes in FIG. Only the thickness distribution shape of the silicon oxide film 2 is changed.
- the structure before the silicon oxide film 2 of the semiconductor pressure sensor of the present embodiment is etched that is, Japanese Patent Application Laid-Open No. 2002-350259.
- a semiconductor pressure sensor having the structure disclosed in the above is used as a reference. More specifically, the offset voltage standardized by the offset voltage of the semiconductor pressure sensor having the structure disclosed in Japanese Patent Laid-Open No. 2002-350259, and the structure disclosed in Japanese Patent Laid-Open No. 2002-350259.
- the sum of the fluctuation amount of the output voltage caused by the temperature change normalized by the fluctuation amount of the output voltage caused by the temperature change caused by the temperature change of the semiconductor pressure sensor having the above is used as an index indicating the characteristics of the semiconductor pressure sensor.
- a ⁇ Tmax becomes smaller than 5. Therefore, if the measurement error of the semiconductor pressure sensor described above is reduced, the effect is difficult to obtain.
- the silicon oxide film 2 having a film thickness distribution that continuously decreases from the peripheral edge portion of the diaphragm 23 toward the central portion. Since the silicon oxide film 2 is formed along the diaphragm 23 and remains in the entire region below the diaphragm 23, the amount of fluctuation in the output voltage caused by the offset voltage and the temperature change is reduced. Both can be reduced.
- the maximum value Tmax of the thickness of the silicon oxide film 2 is larger than 2 m, the measurement error of the semiconductor pressure sensor is reduced, but the silicon oxide film 2 The maximum film thickness The absolute value of the offset voltage before etching of the silicon oxide film 2 is larger than when the large value Tmax is 2 m or less. In this case, it becomes difficult to make the absolute value of the offset voltage equal to the absolute value of the offset voltage of the semiconductor pressure sensor in which the thickness of the silicon oxide film 2 is small. Accordingly, it is desirable that the maximum value Tmax of the thickness of the silicon oxide film 2 is as follows.
- the width of the recess 2a is preferably larger than the width of the through hole (la). That is, it is desirable that the peripheral edge of the recess 2a is positioned outside the peripheral edge of the through hole la. More specifically, as shown in FIG. 13, the semiconductor pressure sensor has an undercut portion UC extending outward from the periphery of the through hole la between the silicon support substrate 1 and the insulating layer 2. Is desirable.
- the undercut amount UCA shown in FIG. 13 is the distance from the periphery of the through hole la to the periphery of the recess 2a. According to this, as shown in FIG. 14, the result that the breakdown voltage of the diaphragm is improved is obtained. The reason why such a result is obtained is not clear at this stage, but it is presumed that the stress concentration generated in the silicon oxynitride film 2 is alleviated.
- the maximum value of the undercut amount UCA is preferably about 10 m. As shown in Fig. 14, it is confirmed that the breakdown voltage is improved when the undercut amount UCA is 10 m or less.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007545167A JP4916449B2 (ja) | 2005-11-15 | 2006-08-30 | 半導体圧力センサおよびその製造方法 |
US12/067,426 US7786541B2 (en) | 2005-11-15 | 2006-08-30 | Semiconductor pressure sensor and its fabrication method |
DE112006002946T DE112006002946T5 (de) | 2005-11-15 | 2006-08-30 | Halbleiter-Druckmesser und Verfahren zu seiner Herstellung |
CN2006800353581A CN101273255B (zh) | 2005-11-15 | 2006-08-30 | 半导体压力传感器及其制造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005330182 | 2005-11-15 | ||
JP2005-330182 | 2005-11-15 |
Publications (1)
Publication Number | Publication Date |
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WO2007058010A1 true WO2007058010A1 (ja) | 2007-05-24 |
Family
ID=38048402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2006/317053 WO2007058010A1 (ja) | 2005-11-15 | 2006-08-30 | 半導体圧力センサおよびその製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7786541B2 (ja) |
JP (1) | JP4916449B2 (ja) |
KR (1) | KR101007432B1 (ja) |
CN (1) | CN101273255B (ja) |
DE (1) | DE112006002946T5 (ja) |
WO (1) | WO2007058010A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009041463A1 (ja) * | 2007-09-25 | 2009-04-02 | Alps Electric Co., Ltd. | 半導体圧力センサ |
JP2009069030A (ja) * | 2007-09-14 | 2009-04-02 | Mitsubishi Electric Corp | 圧力検出素子 |
WO2012121030A1 (ja) * | 2011-03-10 | 2012-09-13 | オムロン株式会社 | 絶対圧力センサ |
JP2013515949A (ja) * | 2009-12-23 | 2013-05-09 | エプコス アーゲー | 圧力センサおよび圧力センサの製造方法 |
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JP6212000B2 (ja) * | 2014-07-02 | 2017-10-11 | 株式会社東芝 | 圧力センサ、並びに圧力センサを用いたマイクロフォン、血圧センサ、及びタッチパネル |
KR101983877B1 (ko) * | 2015-12-28 | 2019-05-29 | 전자부품연구원 | 반도체 압력센서 및 그의 제조방법 |
DE102020101457A1 (de) | 2020-01-22 | 2021-07-22 | Endress+Hauser SE+Co. KG | Drucksensor |
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JP2009069030A (ja) * | 2007-09-14 | 2009-04-02 | Mitsubishi Electric Corp | 圧力検出素子 |
WO2009041463A1 (ja) * | 2007-09-25 | 2009-04-02 | Alps Electric Co., Ltd. | 半導体圧力センサ |
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JP4918140B2 (ja) * | 2007-09-25 | 2012-04-18 | アルプス電気株式会社 | 半導体圧力センサ |
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WO2012121030A1 (ja) * | 2011-03-10 | 2012-09-13 | オムロン株式会社 | 絶対圧力センサ |
DE102015103190B4 (de) | 2014-03-06 | 2018-10-25 | Infineon Technologies Ag | Trägerstruktur und Verfahren zum Bilden einer Trägerstruktur |
US10322481B2 (en) | 2014-03-06 | 2019-06-18 | Infineon Technologies Ag | Support structure and method of forming a support structure |
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CN101273255B (zh) | 2010-05-19 |
JPWO2007058010A1 (ja) | 2009-04-30 |
JP4916449B2 (ja) | 2012-04-11 |
DE112006002946T5 (de) | 2009-01-02 |
CN101273255A (zh) | 2008-09-24 |
US20090140355A1 (en) | 2009-06-04 |
KR101007432B1 (ko) | 2011-01-12 |
KR20080068079A (ko) | 2008-07-22 |
US7786541B2 (en) | 2010-08-31 |
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