EP1412731A1 - Micromechanical component - Google Patents
Micromechanical componentInfo
- Publication number
- EP1412731A1 EP1412731A1 EP02758077A EP02758077A EP1412731A1 EP 1412731 A1 EP1412731 A1 EP 1412731A1 EP 02758077 A EP02758077 A EP 02758077A EP 02758077 A EP02758077 A EP 02758077A EP 1412731 A1 EP1412731 A1 EP 1412731A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cover layer
- micromechanical component
- substrate
- area
- detection device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 239000011148 porous material Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 16
- 239000004020 conductor Substances 0.000 claims description 7
- 239000010410 layer Substances 0.000 description 43
- 239000007789 gas Substances 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 238000011161 development Methods 0.000 description 8
- 230000018109 developmental process Effects 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 6
- 238000000151 deposition Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000005530 etching Methods 0.000 description 3
- 229910021426 porous silicon Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000007743 anodising Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005459 micromachining Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B3/00—Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
- B81B3/0064—Constitution or structural means for improving or controlling the physical properties of a device
- B81B3/0081—Thermal properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/227—Sensors changing capacitance upon adsorption or absorption of fluid components, e.g. electrolyte-insulator-semiconductor sensors, MOS capacitors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2203/00—Basic microelectromechanical structures
- B81B2203/01—Suspended structures, i.e. structures allowing a movement
- B81B2203/0127—Diaphragms, i.e. structures separating two media that can control the passage from one medium to another; Membranes, i.e. diaphragms with filtering function
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C2201/00—Manufacture or treatment of microstructural devices or systems
- B81C2201/01—Manufacture or treatment of microstructural devices or systems in or on a substrate
- B81C2201/0101—Shaping material; Structuring the bulk substrate or layers on the substrate; Film patterning
- B81C2201/0111—Bulk micromachining
- B81C2201/0115—Porous silicon
Definitions
- the present invention relates to a micromechanical component with a substrate and a cover layer applied to the substrate, an area made of porous material mechanically supporting and thermally insulating the cover layer being provided below the cover layer.
- temperatures in any micromechanical components and structural, particularly sensors and actuators, r anwendba the present invention and its underlying problems with respect to one in the technology of silicon can be produced by surface micromachining, .mikromechanischen air quality sensor will be explained.
- Previous air quality sensors are realized with a gas-sensitive material on a ceramic.
- the gas-sensitive material changes its resistance and / or its dielectric properties depending on the concentration of the gas to be detected. To get good sensitivity, the gas sensitive material must be heated.
- the disadvantage here is the use of a ceramic and the associated large design in terms of the large heating output and the long response time.
- micromechanical component according to the invention with the features of claim 1 has the advantage that a simple and inexpensive production of a component with a thermally decoupled heatable cover layer area on which a detection device is provided is possible.
- porous silicon by using porous silicon, a deep cavern with an overlying top layer can be produced relatively easily. Furthermore, there is the possibility The ability to make a defined area on a wafer porous up to a defined thickness and to oxidize it as an option to create a stable framework with low thermal conductivity.
- a heating device is provided on the cover layer for heating the cover layer above the area; and a detecting means is provided for detecting an electrical characteristic of a provided above the 'area on the cap layer medium heated above the range.
- the porous material is * made of the substrate material. This is easily possible, in particular in the case of a silicon substrate.
- a cavity is formed below the area made of porous material.
- the covering Layer formed in that the substrate surface and the surface of the porous region are oxidized.
- the deposition of an additional cover layer can thus be saved.
- the area made of porous material is completely oxidized. Such an oxidation is easily possible due to the porous structure and increases the thermal insulation capacity.
- the component is an air quality sensor, the medium being a gas-sensitive medium and the detection device having a capacitance detection device and / or a resistance detection device.
- the detection device has conductor tracks arranged on the cover layer.
- the detection device has conductor tracks arranged on the insulating layer.
- the heating device runs at least partially below the medium.
- Fig. 1 is a plan view of an air quality sensor according to a first amongsfor * of the present invention
- FIG. 2-4 manufacturing steps for the manufacture of the air quality sensor according to Fig. 1;
- FIG. 7 shows a cross-sectional view of an air quality sensor according to a third embodiment of the present invention.
- FIG. 1 is a top view of an air quality sensor according to a first embodiment of the present invention.
- reference numerals 6 denote contact areas or contact pads, 10 a semiconductor substrate, 40 a cover layer located on the surface of the semiconductor substrate 10 and 300 the boundary of an area in which a cover 30, which mechanically supports and thermally isolates the cover layer 40, see, for example, Fig. 3) made of porous material.
- the substrate material is silicon and the porous material is anodized (porous etched) silicon.
- reference numeral 50 designates an insulating layer provided over the covering layer 40, 70 a respective heating resistor between the covering layer 40 and insulating layer 50, 350 the boundary of an area in which the insulating layer 50 is removed above the covering layer 40, 200 a respective one interdigital capacitor lying on the cover layer 40 and 150 a gas-sensitive material with which the interdigital capacitors are covered.
- the gas-sensitive material 150 is heated by the heating resistors 70 and the capacitance of the interdigital capacitors 200 is measured in a manner known per se.
- the gas sensitive material changes its dielectric properties depending on the concentration of the gas to be detected. The gas quality or concentration can be determined in this way.
- FIG. 2 in addition to the reference numerals 15 that have already been introduced, denote a mask, for example a lacquer mask, and 100 circuit components of a sensor circuit (not explained in more detail).
- the substrate 10 shown in FIG. 2 is a silicon substrate.
- the known method of porous etching produces a structure in which the substrate material is made porous in a specific area 30 and then a cavity 20 is formed under the porous area 30. that is, part of the porous region 30 is removed, which leads to the structure shown in FIG.
- the porous region 30 is closed by depositing the cover layer 40, which consists, for example, of nitride, oxide, oxynitride, silicon carbide or polysilicon. Another possibility for forming the cover layer 40 is to oxidize the substrate surface and the surface of the porous region 30.
- This airtight sealing of the cavity 20 does not necessarily have to take place after the production of the cavity 20, but can also be carried out as one of the last process steps.
- the latter has the advantage that the cover layer 40 does not bulge during processing and thus leads to imaging errors in a structuring process.
- the final internal pressure in the cavity 20 depends on the pressure conditions resulting from the deposition ′′ or oxidation.
- the measuring capacities of the interdigital capacitor 200, the heating resistors 70 and optionally not shown measuring resistors are then generated on the cover layer 40. There can be seen between the cover layer 40 and the conductor tracks of the heating elements. 70 or above the conductor tracks further functional layers are applied and structured.
- the gas-sensitive material 150 is applied, which changes its dielectric properties as a function of the concentration of a gas to be detected.
- the present embodiment has a cavity 20 with an enclosed vacuum under the cover layer 40 and the region 30 in order to ensure good thermal insulation to the substrate 10 when the gas-sensitive material 150 is heated by the heating resistors 70.
- 5-6 are manufacturing steps for manufacturing the air quality sensor according to a second embodiment of the present invention.
- the porous region 30 is closed directly by depositing the cover layer 40 or by the oxidation.
- the oxidation (not shown) has the advantage that the oxide has a lower thermal conductivity than the silicon, so better decoupling from the substrate 10 can be ensured.
- the conductor tracks etc. are produced on the cover layer 40.
- FIG. 7 is a cross-sectional view of an air quality sensor according to a third embodiment of the present invention.
- the heating resistors 70 are provided on the cover layer 40 and the measuring capacitances of the interdigital capacitors 200 are provided on the insulating layer 50, not directly on the cover layer 40 as in the above exemplary embodiments.
- This arrangement has the advantage that that the heating structure can be placed directly under the gas sensitive material 150.
- a two-layer substrate 10 ′′, 10 ′′ ′′ is provided, in which an epitaxial growth on a wafer substrate 10 ′′ layer 10 "" is provided.
- the evaluation circuit 100 is additionally isolated by a buried area 110.
- Such an embodiment has the advantage that the formation of the porous region 30, 30 ⁇ on the lower wafer substrate 10 ′′ can be stopped with a corresponding doping of the components 10 ′′, 10 ′′ ′′.
- changing the electrical resistance of the medium e.g. of the gas-sensitive medium can be detected by means of appropriate measuring electrodes.
- the middle cover layer area can be designed with functional elements in such a way that it is only connected to the substrate outside the cavern with a few webs (eg connection only via two webs in the form of a bridge).
- cover layer or the insulating layer above the porous area which are sensitive to different gases. In this way, several gases could be detected with the same sensor element. Furthermore, it is possible to realize the porous area continuously up to the underside of the substrate.
- micromechanical base materials can be used, and not just the exemplary silicon substrate.
- the electrical leads to the interdigital structures can be located under an electrically insulating protective layer. Furthermore, the electrical connection can be made through contact hole openings in the insulating layer with electrical feed lines that are located in the same plane as the heating resistors 70.
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electrochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Thermal Sciences (AREA)
- Health & Medical Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10136164A DE10136164A1 (en) | 2001-07-25 | 2001-07-25 | Micromechanical component used in sensors and actuators comprises substrate, covering layer on substrate, and thermally insulating region made from porous material provided below covering layer |
DE10136164 | 2001-07-25 | ||
PCT/DE2002/002480 WO2003012420A1 (en) | 2001-07-25 | 2002-07-06 | Micromechanical component |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1412731A1 true EP1412731A1 (en) | 2004-04-28 |
Family
ID=7693002
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02758077A Withdrawn EP1412731A1 (en) | 2001-07-25 | 2002-07-06 | Micromechanical component |
Country Status (5)
Country | Link |
---|---|
US (1) | US6906392B2 (en) |
EP (1) | EP1412731A1 (en) |
JP (1) | JP2004522174A (en) |
DE (1) | DE10136164A1 (en) |
WO (1) | WO2003012420A1 (en) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10053326A1 (en) * | 2000-10-27 | 2002-05-08 | Bosch Gmbh Robert | Micro-mechanical component for sensing dew point contains membrane and porous material thermal insulating zone membrane support |
US7141859B2 (en) * | 2001-03-29 | 2006-11-28 | Georgia Tech Research Corporation | Porous gas sensors and method of preparation thereof |
DE10136164A1 (en) * | 2001-07-25 | 2003-02-20 | Bosch Gmbh Robert | Micromechanical component used in sensors and actuators comprises substrate, covering layer on substrate, and thermally insulating region made from porous material provided below covering layer |
DE10323559A1 (en) * | 2003-05-26 | 2004-12-30 | Robert Bosch Gmbh | Micromechanical device, pressure sensor and method |
JP2006528766A (en) * | 2003-07-25 | 2006-12-21 | パラゴン アクチエンゲゼルシャフト | Gas sensor and method for manufacturing a gas sensor |
CN1947007B (en) * | 2004-01-27 | 2011-11-09 | H2Scan公司 | Thin film gas sensor configuration |
US7531002B2 (en) * | 2004-04-16 | 2009-05-12 | Depuy Spine, Inc. | Intervertebral disc with monitoring and adjusting capabilities |
DE102005029841B4 (en) * | 2004-07-28 | 2013-09-05 | Robert Bosch Gmbh | Micromechanical pressure sensor with heated passivating agent and method for its control |
US7691130B2 (en) * | 2006-01-27 | 2010-04-06 | Warsaw Orthopedic, Inc. | Spinal implants including a sensor and methods of use |
KR100812996B1 (en) * | 2006-12-07 | 2008-03-13 | 한국전자통신연구원 | Micro gas sensor and its manufacturing method |
KR20090064693A (en) * | 2007-12-17 | 2009-06-22 | 한국전자통신연구원 | Micro gas sensor and its manufacturing method |
KR100942439B1 (en) * | 2007-12-28 | 2010-02-17 | 전자부품연구원 | Micro Gas Sensor and Manufacturing Method |
ITMI20080532A1 (en) * | 2008-03-28 | 2009-09-29 | St Microelectronics Srl | METHOD OF MANUFACTURE OF A GAS SENSOR INTEGRATED ON SEMICONDUCTOR SUBSTRATE |
DE102008002579A1 (en) * | 2008-06-23 | 2009-12-24 | Robert Bosch Gmbh | Microelectromechanical sensor element |
WO2010022321A1 (en) * | 2008-08-21 | 2010-02-25 | Georgia Tech Research Corporation | Gas sensors, methods of preparation thereof, methods of selecting gas sensor materials, and methods of use of gas sensors |
US7816681B2 (en) * | 2008-12-03 | 2010-10-19 | Electronics And Telecommunications Research Institute | Capacitive gas sensor and method of fabricating the same |
KR101094870B1 (en) * | 2008-12-17 | 2011-12-15 | 한국전자통신연구원 | Humidity sensor and its manufacturing method |
JP5494078B2 (en) * | 2010-03-19 | 2014-05-14 | 富士通株式会社 | Sensor device and manufacturing method thereof |
KR101677297B1 (en) * | 2010-12-21 | 2016-11-29 | 한국전자통신연구원 | Micro Energy Harvester and Manufacturing Method Thereof |
US8878071B2 (en) | 2011-01-20 | 2014-11-04 | International Business Machines Corporation | Integrated device with defined heat flow |
JP6467173B2 (en) * | 2014-09-16 | 2019-02-06 | ヤマハファインテック株式会社 | Contact combustion type gas sensor |
DE102019130755A1 (en) * | 2019-11-14 | 2021-05-20 | Tdk Corporation | Sensor device, method for producing a sensor device and sensor assembly |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5464966A (en) * | 1992-10-26 | 1995-11-07 | The United States Of America As Represented By The Secretary Of Commerce | Micro-hotplate devices and methods for their fabrication |
DE4400838A1 (en) | 1994-01-14 | 1995-07-20 | Smt & Hybrid Gmbh | Gas sensor chip and method for its production |
US5659127A (en) * | 1996-08-26 | 1997-08-19 | Opto Tech Corporation | Substrate structure of monolithic gas sensor |
GR1003010B (en) * | 1997-05-07 | 1998-11-20 | "����������" | Integrated gas flow sensor based on porous silicon micromachining |
EP0882978A1 (en) | 1997-06-04 | 1998-12-09 | STMicroelectronics S.r.l. | Integrated semi-conductor device comprising a chemoresistive gas microsensor and manufacturing process thereof |
DE19752208A1 (en) | 1997-11-25 | 1999-06-02 | Bosch Gmbh Robert | Thermal membrane sensor and method for its manufacture |
US6265222B1 (en) * | 1999-01-15 | 2001-07-24 | Dimeo, Jr. Frank | Micro-machined thin film hydrogen gas sensor, and method of making and using the same |
DE10136164A1 (en) * | 2001-07-25 | 2003-02-20 | Bosch Gmbh Robert | Micromechanical component used in sensors and actuators comprises substrate, covering layer on substrate, and thermally insulating region made from porous material provided below covering layer |
-
2001
- 2001-07-25 DE DE10136164A patent/DE10136164A1/en not_active Ceased
-
2002
- 2002-07-06 WO PCT/DE2002/002480 patent/WO2003012420A1/en not_active Application Discontinuation
- 2002-07-06 EP EP02758077A patent/EP1412731A1/en not_active Withdrawn
- 2002-07-06 JP JP2003517563A patent/JP2004522174A/en active Pending
- 2002-07-06 US US10/381,307 patent/US6906392B2/en not_active Expired - Fee Related
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO03012420A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2004522174A (en) | 2004-07-22 |
DE10136164A1 (en) | 2003-02-20 |
US6906392B2 (en) | 2005-06-14 |
WO2003012420A1 (en) | 2003-02-13 |
US20040021184A1 (en) | 2004-02-05 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20040211 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
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AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: KRUMMEL, CHRISTIAN Inventor name: SCHAEFER, FRANK Inventor name: PANNEK, THORSTEN Inventor name: ARTMANN, HANS Inventor name: BAUER, MICHAEL Inventor name: WEBER, HERIBERT Inventor name: BENZEL, HUBERT |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: PARAGON AG |
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17Q | First examination report despatched |
Effective date: 20070306 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20070717 |