WO2004028957A1 - Mikromechanisches bauelement und verfahren - Google Patents
Mikromechanisches bauelement und verfahren Download PDFInfo
- Publication number
- WO2004028957A1 WO2004028957A1 PCT/DE2003/000703 DE0300703W WO2004028957A1 WO 2004028957 A1 WO2004028957 A1 WO 2004028957A1 DE 0300703 W DE0300703 W DE 0300703W WO 2004028957 A1 WO2004028957 A1 WO 2004028957A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- substrate
- porous silicon
- cavity
- component according
- micromechanical
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B7/00—Microstructural systems; Auxiliary parts of microstructural devices or systems
- B81B7/0032—Packages or encapsulation
- B81B7/0035—Packages or encapsulation for maintaining a controlled atmosphere inside of the chamber containing the MEMS
- B81B7/0038—Packages or encapsulation for maintaining a controlled atmosphere inside of the chamber containing the MEMS using materials for controlling the level of pressure, contaminants or moisture inside of the package, e.g. getters
-
- 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 invention is based on a micromechanical component and a method according to the category of the independent claims.
- Getter materials made of porous metals are generally known which are used to bind gases in closed systems.
- a low pressure is intended to be enclosed in such a closed system, such as a cavity, which pressure comes close to the vacuum.
- the enclosed gases can be bound with getten text materials and thus the pressure can be greatly reduced.
- a disadvantage of the known getter materials is that the manufacturing process of such getter materials is not suitable for use in a semiconductor manufacturing process.
- Another disadvantage of the known getter materials is that they are not suitable for semiconductors.
- the micromechanical component and the method with the features of the independent claims have the advantage over the fact that the gette ⁇ naterial is made of porous silicon.
- This porous silicon can be easily integrated into an existing semiconductor process.
- porous silicon is also very suitable for semiconductors.
- the porous silicon is provided as an inexpensive getter material.
- porous silicon binds oxygen (02) through the formation of silicon dioxide even at low temperatures. As a result, it is not necessary to activate getter material in the form of porous silicon to heat the component to high temperatures, such as in a high temperature annealing process.
- porous silicon can be easily integrated into semiconductor processes such as CMOS, BCD and the like, and the porous silicon can be used as getter material, for example when encapsulating sensors, in order to minimize the enclosed pressure.
- the use of porous silicon advantageously provides, according to the invention, for producing a large surface area, in particular up to over 1000 m 2 per cm 3 , as a result of which a high getter effectiveness can be achieved.
- first and the second substrate are hermetically sealed to one another at the intermediate layer.
- a first substrate and a membrane are provided, the cavity between the membrane and the first substrate being provided and the region of the porous silicon being provided in the first substrate.
- FIG. 1 shows a schematic diagram of the micromechanical component according to the invention
- FIG. 2 shows a first embodiment of the micromechanical component
- FIG. 3 shows a second embodiment of the micromechanical component according to the invention
- FIG. 4 shows a third embodiment of the micromechanical device according to the invention
- FIG. 5 shows a fourth embodiment of the micromechanical component according to the invention.
- a cavity with an enclosed valve is often required.
- the cavity is shown in all figures with the reference number 10.
- Such cavities or volumes 10 can be produced in various ways. For example, a recess can be created by etching.
- a second substrate 30 is bonded to such a wet-pretreated first substrate 20, various methods such as, in particular, sealing glass bonding,
- Direct bonding or anodic bonding can be used. Furthermore, it is also provided according to the invention to glue or solder the first substrate 20 to the second substrate 30. These connection processes are mostly carried out in a vacuum. This is because a valcuum is to prevail in the cavity 10 after the cavity 10 has been hermetically sealed. Often, however, it is disadvantageously associated with the connection processes that they themselves are associated with a gas development that is based on the principle, so that the internal pressure of the cavity 10 cannot be made arbitrary. Before the cavity 10 is closed, a getter material is therefore introduced according to the invention into the volume 10 to be closed or adjacent to it, the getter material causing the emerging gases are bound and the pressure in the cavity 10 can be reduced.
- porous silicon is provided as the getter material.
- This porous silicon is shown in all figures by means of a region of porous silicon, which is designated by the reference number 11.
- Such low temperatures can easily be integrated into semiconductor processes.
- the activation of the porous silicon as getter material is also possible after the production of semiconductor components, whereby it must be taken into account that finished semiconductor components generally have a lower temperature resistance than the pure semiconductor material that was used for their production.
- oxygen can be bound to the very large surface of the porous silicon 11.
- Porous silicon dioxide is then formed from the gaseous oxygen and the porous silicon.
- a particularly advantageous field of application of the method and the micromechanical component according to the invention is to use the porous silicon as an oxygen getter, for example in anodic bonding, the anodic bonding denoting a connection of silicon, in particular silicon wafers, by means of mostly sodium-containing glass.
- oxygen is generated at the connecting surface, which diffuses into cavities and in particular into the cavity 10 and can be bound in the cavity 10 by getten materials, such as in particular the porous silicon 11 according to the invention, in order to keep the pressure in the cavity 10 or in as low as possible to produce the cavern 10.
- the anodic bonding is exemplified according to the invention, for example at an elevated temperature
- the gettering effect of the porous silicon or the area of the porous silicon 11 can be increased.
- oxygen is generated, which can be bound, with which the internal pressure in the cavity 10 or in the cavern 10 can be at least partially reduced.
- Gases other than oxygen, which are also generated during seal glass bonding, can also be adsorbed on the very large surface of the porous silicon and thus also reduce the pressure.
- the porous silicon can also advantageously be used as a getter material in silicone fusion bonding as a connection process, high temperatures of about 1000 ° C. being reached in this process, but the porous silicon is not destroyed.
- FIG. 1 shows a schematic diagram of the micromechanical component according to the invention.
- a closed volume which is also referred to as cavity 10
- the micromechanical component according to the invention having a first substrate 20 and a second substrate 30, the first substrate 20 being connected to the second substrate 30 and between the substrates 20, 30 an intermediate layer 25 is provided.
- the first substrate 20 is provided in particular as a silicon substrate and the second substrate 30 is also provided in particular as a silicon substrate.
- the area of the porous silicon 11 in the second substrate 30 is provided in the schematic diagram in FIG.
- the region 11 of porous silicon can be produced particularly simply by means of an etching process in the silicon material of the second substrate 30.
- the intermediate layer 25 being provided, for example, as a seal glass.
- FIG. 2 shows a first embodiment of the micromechanical device according to the invention
- the component has the first substrate 20, which has a micromechanical structure 200.
- a sacrificial layer 21, for example in the form of a sacrificial oxide 21, is provided in particular in the first substrate 20.
- a functional layer 22 is provided in the first substrate 20 for producing the micromechanical structure 200, which is represented in particular by means of an epipoly silicon layer.
- the micromechanical structure 200 comprises, for example, oscillator structures.
- the second substrate 30 is shown in FIG. 2, which comprises the region 11 of porous silicon.
- a connection layer 26 forms the cavity 10 through the structuring of the substrates 20, 30.
- the area of porous silicon 11 which adjoins the cavity 10 is provided in the second substrate 30.
- the micro-mechanical structure 200 in particular represents an acceleration or rotation rate sensor.
- the connection layer 26 comprises in particular seal glass.
- FIG. 3 shows a second embodiment of the milcromechanical component according to the invention.
- the first substrate 20 is shown in the upper region of FIG. 3.
- the first substrate 20 is also referred to as a sensor substrate.
- the micromechanical structure 200 is produced in the first substrate or on the first substrate 20, a sacrificial layer 21 and a functional layer 22, in particular made of epipolysilicon, being provided for this purpose again.
- a composite wafer is provided as the second substrate 30, the composite wafer consisting of the actual second substrate 30 and a further connection layer 27, the further connection layer 27 in particular as a Pyrex glass layer with the actual second substrate 30 connected is.
- the further connection layer 27 together with the second substrate 30 forms the composite wafer.
- a region of porous silicon 11 is provided in the composite wafer and a so-called chemical electrode 50 is provided.
- the shield electrode 50 is particularly necessary to protect the oscillator structures of the functional layer during anodic bonding.
- the vibrating structures would be pulled up by electrostatic forces and bonded to the substrate 20 when a voltage was applied, which is necessary for the anodic bonding to be carried out later.
- the shield electrode 50 is partially open, so that at the edge or at locations where no vibrating structures of the milcromechanical structure 200 are provided, a connection between the
- Cavity 10 and the area of porous silicon 11 is made. This opening of the chemical electrode is designated by the reference number 51 in FIG.
- the volume 10 to be evacuated or the cavity 10 is thus connected to the region of porous silicon 11.
- FIG. 4 shows a third embodiment of the micromechanical component according to the invention.
- the area of porous silicon 11 is created in the first substrate 20 before the sacrificial layer 21 or the functional layer 22 is applied. This results in the sequence of the layers shown in FIG. 4, the first substrate 20 first, then the porous region Silicon 11, then the (etched away) sacrificial layer 21 and then the functional layer 22 follows.
- the micromechanical structure 200 represents an acceleration sensor or a rotation rate sensor, this being provided in particular in the micropackage teclinology (MPT) shown in the figure ,
- FIG. 5 shows a fourth filling form of the milcromechanical component according to the invention.
- the fourth embodiment represents an absolute pressure sensor with porous silicon as getter material for generating a small internal pressure in the cavity 10.
- the area of porous silicon is again with the reference symbol
- the component according to the invention comprises a sacrificial layer 21 on the first substrate 20, on which a membrane 60 is provided.
- the top of the membrane 60 which is shown in FIG. 5 in the figure above, is exposed to the ambient pressure of the pressure sensor, and is in the cavity 10 through which
- Getter material 11 causes a particularly low internal pressure to prevail. Bending of the membrane 60 as a function of the external pressure conditions is detected by sensor elements (not shown in FIG. 5) in the region of the membrane 60 and converted into electrical signals.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004538669A JP2006500233A (ja) | 2002-09-26 | 2003-03-06 | マイクロマシニング型の構成素子および方法 |
US10/529,420 US7404332B2 (en) | 2002-09-26 | 2003-03-06 | Micromechanical component and method |
EP03718615A EP1549586A1 (de) | 2002-09-26 | 2003-03-06 | Mikromechanisches bauelement und verfahren |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10244786.1 | 2002-09-26 | ||
DE10244786A DE10244786A1 (de) | 2002-09-26 | 2002-09-26 | Mikromechanisches Bauelement und Verfahren |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004028957A1 true WO2004028957A1 (de) | 2004-04-08 |
Family
ID=31984077
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2003/000703 WO2004028957A1 (de) | 2002-09-26 | 2003-03-06 | Mikromechanisches bauelement und verfahren |
Country Status (5)
Country | Link |
---|---|
US (1) | US7404332B2 (de) |
EP (1) | EP1549586A1 (de) |
JP (1) | JP2006500233A (de) |
DE (1) | DE10244786A1 (de) |
WO (1) | WO2004028957A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009051853A1 (de) | 2009-10-27 | 2011-06-09 | Hydac Electronic Gmbh | Messzelle zur Infrarot-Analyse von Fluiden, Messsystem mit einer solchen Messzelle und Verfahren zur Herstellung einer solchen Messzelle |
FR2976932A1 (fr) * | 2011-06-23 | 2012-12-28 | Commissariat Energie Atomique | Structure a materiau getter protege hermetiquement lors de sa realisation |
US20130049143A1 (en) * | 2011-08-26 | 2013-02-28 | Qualcomm Mems Technologies, Inc. | Release activated thin film getter |
WO2014159946A1 (en) * | 2013-03-13 | 2014-10-02 | Robert Bosch Gmbh | Mems device having a getter |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996039632A1 (en) * | 1995-06-06 | 1996-12-12 | Analog Devices, Inc. | Package for sealing an integrated circuit die |
US5882496A (en) * | 1997-02-27 | 1999-03-16 | The Regents Of The University Of California | Porous silicon structures with high surface area/specific pore size |
US6139758A (en) * | 1996-08-23 | 2000-10-31 | Enlite Laboratories, Inc. | Method of manufacturing a micromachined thermal flowmeter |
WO2002002458A1 (de) * | 2000-07-05 | 2002-01-10 | Robert Bosch Gmbh | Verfahren zur herstellung eines halbleiterbauelements sowie ein nach dem verfahren hergestelltes halbleiterbauelement |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4331798B4 (de) * | 1993-09-18 | 2004-08-26 | Robert Bosch Gmbh | Verfahren zur Herstellung von mikromechanischen Bauelementen |
JP3305516B2 (ja) * | 1994-10-31 | 2002-07-22 | 株式会社東海理化電機製作所 | 静電容量式加速度センサ及びその製造方法 |
JP2001068780A (ja) * | 1999-08-30 | 2001-03-16 | Fuji Photo Film Co Ltd | 半導体レーザ素子およびその製造方法 |
US6589883B2 (en) * | 2000-03-29 | 2003-07-08 | Georgia Tech Research Corporation | Enhancement, stabilization and metallization of porous silicon |
DE10038099A1 (de) * | 2000-08-04 | 2002-02-21 | Bosch Gmbh Robert | Mikromechanisches Bauelement |
DE10055081A1 (de) * | 2000-11-07 | 2002-05-16 | Bosch Gmbh Robert | Mikrostrukturbauelement |
DE10244785A1 (de) * | 2002-09-26 | 2004-04-08 | Robert Bosch Gmbh | Verfahren und mikromechanisches Bauelement |
DE102004043357B4 (de) * | 2004-09-08 | 2015-10-22 | Robert Bosch Gmbh | Verfahren zur Herstellung eines mikromechanischen Sensorelements |
-
2002
- 2002-09-26 DE DE10244786A patent/DE10244786A1/de not_active Withdrawn
-
2003
- 2003-03-06 US US10/529,420 patent/US7404332B2/en not_active Expired - Fee Related
- 2003-03-06 WO PCT/DE2003/000703 patent/WO2004028957A1/de active Application Filing
- 2003-03-06 EP EP03718615A patent/EP1549586A1/de not_active Withdrawn
- 2003-03-06 JP JP2004538669A patent/JP2006500233A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996039632A1 (en) * | 1995-06-06 | 1996-12-12 | Analog Devices, Inc. | Package for sealing an integrated circuit die |
US6139758A (en) * | 1996-08-23 | 2000-10-31 | Enlite Laboratories, Inc. | Method of manufacturing a micromachined thermal flowmeter |
US5882496A (en) * | 1997-02-27 | 1999-03-16 | The Regents Of The University Of California | Porous silicon structures with high surface area/specific pore size |
WO2002002458A1 (de) * | 2000-07-05 | 2002-01-10 | Robert Bosch Gmbh | Verfahren zur herstellung eines halbleiterbauelements sowie ein nach dem verfahren hergestelltes halbleiterbauelement |
Non-Patent Citations (1)
Title |
---|
HENMI H ET AL: "VACUUM PACKAGING FOR MICROSENSORS BY GLASS-SILICON ANODIC BONDING", SENSORS AND ACTUATORS A, ELSEVIER SEQUOIA S.A., LAUSANNE, CH, vol. A43, no. 1/3, 1 May 1994 (1994-05-01), pages 243 - 248, XP000454118, ISSN: 0924-4247 * |
Also Published As
Publication number | Publication date |
---|---|
EP1549586A1 (de) | 2005-07-06 |
DE10244786A1 (de) | 2004-04-08 |
US20060137460A1 (en) | 2006-06-29 |
US7404332B2 (en) | 2008-07-29 |
JP2006500233A (ja) | 2006-01-05 |
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