Source: https://patents.google.com/patent/KR20050014871A/en
Timestamp: 2020-08-04 00:22:48+00:00
Document Index: 85941441

Matched Legal Cases: ['art 51', 'art 4', 'art 3', 'art 4', 'art 3', 'art 5', 'art 5', 'art 3', 'art 3', 'art 3', 'art 5', 'art 2', 'arts 2', 'art 3', 'art 2', 'art 4', 'art 2', 'art 3', 'art 3', 'art 5', 'art 52', 'art 51', 'art 61', 'art 5', 'art 5', 'art 61', 'art 5', 'art 4', 'art 3', 'art 2', 'art 2', 'art 2', 'art 51', 'art 5', 'art 61', 'art 5']

KR20050014871A - High-pressure sensor comprising silicon membrane and solder layer - Google Patents
High-pressure sensor comprising silicon membrane and solder layer
KR20050014871A
KR20050014871A KR10-2004-7020820A KR20047020820A KR20050014871A KR 20050014871 A KR20050014871 A KR 20050014871A KR 20047020820 A KR20047020820 A KR 20047020820A KR 20050014871 A KR20050014871 A KR 20050014871A
KR10-2004-7020820A
마스트마틴
로게베르트홀트
하비비마조우트
카이져랄프
2003-05-07 Application filed by 로베르트 보쉬 게엠베하 filed Critical 로베르트 보쉬 게엠베하
2005-02-07 Publication of KR20050014871A publication Critical patent/KR20050014871A/en
239000010410 layers Substances 0.000 title claims abstract description 9
239000010703 silicon Substances 0.000 title claims description 14
XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound 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[Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title description 11
238000009530 blood pressure measurement Methods 0.000 claims abstract description 11
229910000679 solders Inorganic materials 0.000 claims abstract description 10
FIELD OF THE INVENTION The present invention relates to a device for pressure measurement, in particular high pressure measurement, comprising a pressure disposed in a housing, having a sensor membrane on a first side of the sensor element and a recess on a second side opposite the first side. It includes a sensor. The recess extends from the second side to the sensor membrane. The pressure sensor is formed as a semiconductor pressure sensor and is soldered through a solder layer to a second surface surrounding the recess, just above the support having the first pressure channel portion. The first pressure channel portion and the recess are connected to each other.
HIGH-PRESSURE SENSOR COMPRISING SILICON MEMBRANE AND SOLDER LAYER}
Such a device for pressure measurement is disclosed, for example, in German Patent No. 100 14 992 A1. The high pressure sensor disclosed herein uses a metal pressure measuring cell with a recess as the pressure sensor. The sensor element and the measuring film are formed on one side of the metal pressure measuring cell. On the second side located opposite, the pressure measuring cell is soldered onto the connection of the sensor device. The evaluation circuit is arranged on a separate conductive substrate or hybrid and is electrically connected with the sensor element on the upper surface of the pressure measuring cell. With this device a high pressure of more than 140 bar can be measured.
Further, for example, German Patent No. 197 31 420 A1 discloses a device for pressure measurement with a silicon chip, which is a semiconductor pressure sensor, having a sensor element and an analysis circuit on the top surface and mounted on a glass socket. However, such a pressure sensor can only measure relatively small pressures of 70 bar or less since the glass or silicon chip may be broken if a large mechanical pressure is applied.
The present invention relates to a device for pressure measurement having the features described in the preamble of the independent claim 1.
Embodiments of the present invention are illustrated in the drawings and illustrated by the following description.
1 is a cross-sectional view of the first embodiment of the present invention.
FIG. 2 is a cross-sectional view of the embodiment of FIG. 1 along line II-II of FIG.
3 is an enlarged detailed view of FIG.
4 is an enlarged detailed view of another embodiment.
5 is a diagram of another embodiment of the present invention formed as a pressure sensor module.
6 is a view of the pressure sensor including the pressure sensor module of FIG. 5 aligned therein.
The device according to the invention for pressure measurement comprising the main features of claim 1 comprises the use of a pressure sensor comprising a sensor element on the top surface and a semiconductor chip, for example an additional evaluation circuit such as an integrated circuit. Allows high pressure measurements above 70 bar. The cost in the prior art, ie the cost for the isolation of the sensor element of the metal pressure measuring cell in the conventional high pressure measuring sensor, is well reduced. Higher integration of the device can be better achieved through a combination of sensor element and evaluation circuit on the semiconductor chip. Further, the semiconductor chip is directly soldered to the recesses in the boundary region surrounding the semiconductor chip on the support having the first pressure channel portion, and the first pressure channel portion and the recess are connected to each other, thereby providing high pressure resistance between the semiconductor chip and the support portion. Bonding is well achieved.
Preferred embodiments and further modifications of the invention are made possible by the features specified in the dependent claims.
The pressure sensor may be integrally formed of a semiconductor material such as silicon. It is particularly preferable to use a laminated structure consisting of a first semiconductor structure having a sensor film and a sensor element and a second semiconductor structure having them on a tightly coupled bonding region and soldered onto a support. The second semiconductor structure makes it possible to prevent a wide range of thermal and mechanical stress loads from reaching and damaging the sensor element. This can improve the reliability and durability of the device. The first semiconductor structure and the second semiconductor structure may preferably be composed of silicon. The bonding region may consist of eutectic zones of gold and silicon.
In order to reduce the thermal stress between the semiconductor chip and the support, it is desirable for the solder layer to have a lower coefficient of thermal expansion than tin-lead solder, which is more suitable for semiconductor materials. For example, the use of AuSn20-solder is preferred.
The support preferably has a coefficient of thermal expansion suitable for the semiconductor material of the pressure sensor. The support may be composed of a metal alloy, such as iron-nickel (trade name Invar) or iron-nickel-cobalt (trade name Kovar) alloy.
It is particularly preferable to form a recess in the semiconductor pressure sensor by performing reactive ion etching (trench etching) on the pressure sensor. As a result, it is possible to avoid sudden changes and cracks that create a large pressure load stress and cause breakage.
Furthermore, the device has a sensor housing, a connecting portion covering the passage hole is fixed as a separate component to the outer surface of the first sensor housing portion of the sensor housing having the passage hole, and a support arranged in the sensor housing passes through the passage hole. For example, it is preferable to be combined with the connection part by laser welding. This is because the structure can greatly reduce the thermal and mechanical stress between the connection and the support.
A circumferential collar is arranged around a second pressure channel portion formed in the connection at the face of the connection towards the passage hole, the support having a junction engaging the collar at the face toward the connection, the first pressure channel portion extending within the connection. By doing so, the thermal and mechanical stresses between the joint and the support are further reduced. In this connection, it is particularly preferable that the junction has an outer diameter clearly smaller than the outer diameter of the support, so that the joining area of the support and the junction is made smaller.
In a more preferred embodiment, the pressure sensor, the support and the cover attached to the support form a pressure sensor module, the cover and the support form a closed module housing holding the pressure sensor, and the junction is fixed to the support, It is integrally coupled with the support, in which the first pressure channel portion extends. The modular structure has the advantage that it can be screened in the original sensor housing as a pressure module that has been screened so as not to operate prior to mounting upon adjustment of the pressure sensor.
1 and 2 show a first embodiment of a device according to the invention for pressure measurement. The semiconductor pressure sensor 10 is soldered onto the support 5 in the form of a socket. 3 is an enlarged detailed view of a semiconductor pressure sensor soldered onto the socket 5. The semiconductor pressure sensor 10 is in particular constructed as a silicon chip and has a sensor element 12 on the top surface 15. The central portion of the upper surface spanning over the recess 14 located in the lower surface serves as the sensor membrane 11, and the sensor element 12 detects deformations resulting from the pressure load of the thin sensor membrane 11. . An evaluation circuit, not shown in addition to the sensor element 12, may be arranged around the sensor film 11 on the top surface 15 of the semiconductor pressure sensor 10. The recess 14 is preferably formed in the pressure sensor through reactive ion etching (trench-etching). As a result, a smooth transition portion is formed on the inner wall of the recess 14, and a sharp edge that can form a crack under high pressure load can be avoided. The semiconductor pressure sensor is soldered directly on the upper surface 55 of the support 5 to the boundary region 16a of the lower surface 16 surrounding the recess 14. Top surface 55 is surrounded by circumferential collar 56 to center pressure sensor 10.
In order to reduce the thermal stress between the semiconductor pressure sensor 10 and the support 5, the support 5 is made of a material suitable for the thermal expansion rate of silicon, preferably an iron-nickel alloy (trade name: Invar) or iron-nickel-cobalt. Made of alloy (trade name: Kovar). The solder layer 13 between the semiconductor pressure sensor 10 and the support 5 has a very small thermal expansion rate, preferably a smaller thermal expansion rate than the conventional tin-lead solder. Particular preference is given to using AuSn20 solder. As can be seen in FIG. 3, the recess 14 is connected with a first pressure channel portion 51 aligned in the support 5 such that the lower surface of the sensor membrane 11 facing the recess 14 is firstly connected. It is pressurized by the pressure through the pressure channel part 51.
In another embodiment, the semiconductor pressure sensor 10 has a sensor element 12 disposed on its top surface 15, which engages with the second semiconductor structure 19 on a surface remote from the sensor element 12. It has a first semiconductor structure 17. The first and second semiconductor structures may be formed of silicon, wherein the bonding region 18 of these semiconductor structures preferably consists of a eutectic region of gold and silicon. The second semiconductor structure 19 is soldered to the face 16 on the support 5, away from the first semiconductor structure 17. In this embodiment, it is particularly preferable that the second semiconductor structure functions as a protective film for the first semiconductor structure. Thermal mechanical stress is initially transmitted only from the support to the second semiconductor structure. This ensures that the sensor element 12 and the sensor membrane 11 are well protected.
As can be seen in FIG. 1, the socket-shaped support 5 is joined by laser welding to a surface distant from the semiconductor pressure sensor 1, for example with a metal connection 4 made of stainless steel. The connection part 4 is formed as a bolt connection part and is welded on the outer surface 32 of the metal first sensor housing part 3 as a separate member. Thus, the connection part 4 covers the central passage hole 31 in the first sensor housing part 3. The peripheral wall of the first sensor housing portion 3 forms a regular hexagon, as best seen in FIG.
The support part 5 formed in a substantially cylindrical shape has a diameter smaller than the passage hole 31. A junction 52 is formed on the surface of the support 5, far from the semiconductor pressure sensor 10, and a first pressure channel portion 51 is inserted in the center thereof. The connecting portion 4 has a circumferential collar 42 on the side facing the passage hole 31, which is arranged circumferentially around a second pressure channel portion 41 arranged in the connecting portion 4. do. The support 5 is fitted to the joint 52 in the collar 42 and welded thereto. In addition, the support part 5 can be fitted through the passage hole 31 of the first sensor housing part 3, and the connection part is connected to the outer surface 32 of the first sensor housing part 3 in the region 43. Can be welded. In operation, pressure is transported from the second pressure channel layer 41 to the first pressure channel portion 51 and from here to the recess 14 of the lower surface of the semiconductor pressure sensor.
In this embodiment, a perforated curve 6 is provided which is welded on the face of the first sensor housing part 3, opposite the outer face 32. The perforated curve 6 has an opening 61 through which the support 5 is guided. A conductive substrate 7 or hybrid or corresponding member having a recess 71 is disposed on the face of the perforated bend 6, which is remote from the first sensor housing portion 3, and penetrates the recess 71. The support part 5 is guided. The semiconductor pressure sensor 10 is connected to the conductive channel 72 on the conductive substrate 7 with a bonding wire (not shown). The connecting face 73 of the conductive substrate 7 is connected to the electrical connecting element 8 by means of a contact spring element 9 and is located in the second sensor housing part 2, for example formed of plastic, The two sensor housing parts 2 are mounted on the perforated bends 6. In the embodiment shown in FIG. 1, the perforated curve is curved so that the top surface of the conductive substrate mounted on the perforated curve, with the conductive channel, is arranged approximately on the same plane as the top surface of the semiconductor sensor 10. The connecting element 8 is guided into the sensor housing 1 from the connector 23. The outer region of the perforated curve has a groove-shaped outer portion 62, in which a cylindrical wall 22 of the second sensor housing portion 2 is fitted. By means of sealing engagement in the contour 62, the second sensor housing 2 is sealed towards the perforated curve 6. The first sensor housing part 3, the second sensor housing part 2, the perforated bends 6 and the connection part 4 located therebetween form a closed sensor housing 1, in which a support part ( 5) and pressure sensor 10 are arranged.
The second sensor housing part 2 can also be directly connected to the first sensor housing part 3 and the perforated curve can be removed. Expanded opening in the perforated bend by extending the opening 61 in the perforated bend 6, forming the perforated bent in a ring shape, and mounting the conductive substrate 7 on the first sensor housing part 3. It is also possible to fit in.
Another embodiment of a device for pressure measurement is shown in FIG. 5. In this embodiment the metal support 5 forms the bottom of the housing of the module housing, in which the semiconductor pressure sensor 10 is located. The semiconductor pressure sensor 10 of this embodiment is similar to the embodiment of FIG. 4 having two semiconductor structures, and is soldered to the second semiconductor structure 19 inside the groove 55 on the support 5. The pin shaped electrical contact element 62 is melt bonded in the glass bushing 63, which is located in the passage hole 56 of the support 5. In the center hole 57 of the support part 5, a hollow cylindrical joining part 52 is located, in which the first pressure channel part 51 extends. The junction 52 may also be formed integrally with the support. The pressure sensor 10 is connected to the pin shaped contact element 62 by a coupling wire 64. The cover part 61 mounted on the support part 5 together with the support part 5 forms a closed module housing 66. In order that the pressure sensor 10 can measure a reference pressure, it is preferable that the reference pressure amount (for example, vacuum) between the lid part 61 and the support part 5 is sealed.
The pressure sensor module 66 shown in FIG. 5 is arranged in the sensor housing 1, as shown in FIG. As a result, the pressure sensor module 66 is mounted on the conductive substrate 7. The electrical contact element 62 is coupled to the conductive channel of the conductive substrate 7, for example by soldering, while the junction 52 is guided through the opening of the conductive substrate and the connection 4 of the sensor housing 1 is connected. Is mounted in the collar 42 and welded to the collar, as in the embodiment of FIG. The connection part 4 is arranged in the first sensor housing part 3. The second sensor housing part 2 made of plastic is coupled to a substantially cylindrical metal bush 26 and the end of the metal bush away from the second sensor housing part 2 has a curved edge 28. This edge portion is welded to the first sensor housing portion 3. The sealing binder 27 seals the joining region of the metal bush 26 and the first sensor housing portion 2. The electrical connection element 8 is guided into the sensor housing 1 by the second sensor housing part 2 and is electrically connected to the conductive substrate 7. The coupling member 67 couples the cover portion 61 of the pressure sensor module 66 to the inner surface of the second sensor housing portion 2.
A second surface (10) disposed on the second surface (16) disposed in the housing (10) and having a sensor element (12) and a sensor film (11) on the first surface (15) and positioned opposite the first surface (10). In a device for pressure measurement, in particular high pressure measurement, comprising a pressure sensor 10 with a recess 14 extending from 16 to the sensor membrane 11,
The pressure sensor 10 is formed as a semiconductor pressure sensor, and on the support 5 having the first pressure channel portion 51, the boundary region 16a of the second surface 16 surrounding the recess 14. And a first pressure channel portion (51) and a recess (14) are connected to each other by soldering by means of a solder layer (13).
The device according to claim 1, wherein the pressure sensor (10) is integrally formed of a semiconductor material.
2. The pressure sensor 10 according to claim 1, wherein the pressure sensor 10 comprises them on the first semiconductor structure 17 having the sensor film 11 and the sensor element 12 and on the tightly coupled bonding region 18 and the support 5. And a laminate structure comprising a second semiconductor structure (19) soldered onto it.
4. An apparatus according to claim 3, wherein the first semiconductor structure (17) and the second semiconductor structure (19) consist of silicon and the bonding region (18) is formed through a eutectic region of gold and silicon.
The device according to claim 2 or 3, wherein the solder layer (13) has a smaller coefficient of thermal expansion than tin-lead solder.
Apparatus according to claim 2 or 3, characterized in that the support (5) has a coefficient of thermal expansion suitable for the semiconductor material of the pressure sensor (10).
6. Device according to claim 5, characterized in that the solder layer (13) is formed of AuSn20.
7. Device according to claim 6, characterized in that the support (5) is made of a material suitable for the thermal expansion coefficient of silicon, preferably consisting of an iron-nickel alloy or an iron-nickel-cobalt alloy.
Apparatus according to any of the preceding claims, characterized in that the recess (14) is formed by performing reactive ion etching on the pressure sensor.
The device according to claim 1, wherein the device has a sensor housing 1,
A connecting portion 4 covering the passage hole 31 is fixed to the outer surface 32 of the first sensor housing portion 2 of the sensor housing having the passage hole 31,
The device (5) arranged in the sensor housing is characterized in that it is coupled with the connection (4) through the passage hole (31).
Device according to claim 11, characterized in that the support (5) is welded to the connection (4).
12. A circumferential collar (42) according to claim 10 or 11 is arranged around a second pressure channel portion (41) formed in the joint (4) at the face of the joint (4) towards the passage hole (31), The device 5 is characterized in that it has a splice 52 which engages the collar 42 on the side facing the connection 4, in which the first pressure channel part 51 extends. .
13. Device according to claim 12, characterized in that the junction (52) has an outer diameter that is clearly smaller than the outer diameter of the support (5).
The pressure sensor 10, the support part 5, and the cover part 61 mounted on the support part 5 form the pressure sensor module 66.
The cover portion 61 and the support portion 5 form a closed module housing for holding the pressure sensor 10,
The device characterized in that the junction (52) is fixed to the support (5), or integrally coupled with the support (5), in which the first pressure channel portion (51) extends.
KR10-2004-7020820A 2002-06-22 2003-05-07 High-pressure sensor comprising silicon membrane and solder layer KR20050014871A (en)
KR20050014871A true KR20050014871A (en) 2005-02-07
KR10-2004-7020820A KR20050014871A (en) 2002-06-22 2003-05-07 High-pressure sensor comprising silicon membrane and solder layer
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