EP1949040A1 - Sensor, sensor component and method for producing a sensor - Google Patents

Sensor, sensor component and method for producing a sensor

Info

Publication number
EP1949040A1
EP1949040A1 EP06807779A EP06807779A EP1949040A1 EP 1949040 A1 EP1949040 A1 EP 1949040A1 EP 06807779 A EP06807779 A EP 06807779A EP 06807779 A EP06807779 A EP 06807779A EP 1949040 A1 EP1949040 A1 EP 1949040A1
Authority
EP
European Patent Office
Prior art keywords
sensor
gel
sensor element
housing
carrier element
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Withdrawn
Application number
EP06807779A
Other languages
German (de)
French (fr)
Inventor
Dirk Ullmann
Harald Emmerich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1949040A1 publication Critical patent/EP1949040A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G01D11/245—Housings for sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
    • H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
    • H01L2224/45001—Core members of the connector
    • H01L2224/45099—Material
    • H01L2224/451—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof
    • H01L2224/45138—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
    • H01L2224/45144—Gold (Au) as principal constituent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481—Disposition
    • H01L2224/48135—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip
    • H01L2224/48137—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip the bodies being arranged next to each other, e.g. on a common substrate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481—Disposition
    • H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
    • H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L2224/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
    • H01L2224/85909—Post-treatment of the connector or wire bonding area
    • H01L2224/8592—Applying permanent coating, e.g. protective coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/06—Polymers
    • H01L2924/078—Adhesive characteristics other than chemical
    • H01L2924/0781—Adhesive characteristics other than chemical being an ohmic electrical conductor
    • H01L2924/07811—Extrinsic, i.e. with electrical conductive fillers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
    • H01L2924/181—Encapsulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • Rotation rate sensors and acceleration sensors too.
  • sensors can be used, for example, to provide control and control functions to ensure the stability of an automobile, as e.g. Electronic Stability Programs (ESP) are widely used.
  • ESP Electronic Stability Programs
  • reliable sensor data must be available to them in order to be able to evaluate a current operating state of a motor vehicle and to be able to initiate appropriate control and control measures accordingly.
  • acceleration sensors are used which trigger an airbag when a specific deceleration is detected.
  • yaw rate sensors which determine cornering speeds of a motor vehicle and correspondingly coordinated braking action on the individual Initiate wheels if a critical situation is detected by the electronic stability program.
  • sensors are used which are manufactured as micromechanical components.
  • An example of an acceleration sensor is described in DE 10104868. There is also given a corresponding manufacturing method for such a component.
  • Cost-effective plastic enclosures such as Plastic Leaded Chip Carrier (PLCC), Small Outline IC (SOIC), Small Outline (QFN), and Small Outline (SO) have disadvantages in sensor applications.
  • PLCC Plastic Leaded Chip Carrier
  • SOIC Small Outline IC
  • QFN Small Outline
  • SO Small Outline
  • offset-stable sensors when plastic packaging is used, can not be subject to high drift stability requirements. This applies in particular with regard to the temperature and also the service life of the sensor element. Instead, very expensive housings, e.g. ceramic housings are used, which in turn make the end product more expensive. Consequently, there is a great need for cost-effectively manufacturable sensor elements, in particular micromechanical sensor elements, which have a high long-term stability, virtually no offset and offer a high measurement accuracy for absolute measurements over their entire life.
  • the object underlying the invention is to provide a sensor, a sensor component and a method for producing a sensor, which can be realized with conventional, technically simple housings, and do not have the disadvantages of the known prior art.
  • This object is achieved by a sensor component according to the features of patent claim 1, by a method for producing a sensor according to the features of patent claim 10 and a sensor according to the features of patent claim 15.
  • the sensor element and the associated carrier element preferably present in the form of an associated evaluation electronics in the form of an application-specific semiconductor element, are arranged particularly advantageously above one another and connected to one another via a short connection.
  • the connection paths between the active devices are short and capacitive influences which adversely affect the evaluation of the sensor information and which are caused via the connecting wires are reduced.
  • an elastic buffer element in particular an adhesive pad, is arranged, which secures the sensor element and at the same time decouples it from mechanical environmental influences because of its elastic properties.
  • the first connection is executed according to a development of the structure according to the invention in a flip-chip manner.
  • bonding wires are used only for the electrical connection of the sensor component to the outside, thereby complicated production steps are reduced to a minimum.
  • a partial region of the sensor element is advantageously contacted by a gel which compensates for thermal and mechanical influences in the region of the sensitive sensor element.
  • a gel which compensates for thermal and mechanical influences in the region of the sensitive sensor element.
  • the gel also contacts the plastic housing, since this optimally compensates for thermal and mechanical stresses
  • the gel also contacts the carrier element, since an even better approximation of the conditions in the interior of the housing takes place with respect to the components present there and the compensation of thermal and mechanical stresses is made even more optimal.
  • a flip-chip connection is performed as a ball grid array, since ball grid arrays have proven themselves in practice and produce a good connection between the components.
  • conductive adhesive is used for contacting between the sensor element and the evaluating carrier element, wherein advantageously this conductive adhesive may also be an anisotropically conductive adhesive.
  • the sensor element is soldered to the carrier element via reflow soldering, since no long-term influences occur in this way in the region of the connection between the chip elements.
  • the sensor element is particularly advantageously designed as a micromechanical sensor element, because such sensor elements can be accurately measured and produced inexpensively in large quantities.
  • the carrier element is particularly advantageously designed as an application-specific semiconductor element for processing sensor information of the first sensor element, since in this way both components of the sensor can be optimally matched to each other and the particular needs of the respective components with respect to mechanical , thermal and electrical long-term stability is particularly taken into account.
  • a highly accurate, long-term stable structure which consists of a sensor element and a carrier element, preferably present in the form of an evaluating semiconductor element, wherein advantageously only the evaluating semiconductor element Bonding wires with connection pins of the chip housing is connected to the outside, but nevertheless a cost-effective and technically simple plastic housing can be used.
  • a carrier element preferably present in the form of an evaluating semiconductor element
  • Bonding wires with connection pins of the chip housing is connected to the outside, but nevertheless a cost-effective and technically simple plastic housing can be used.
  • the resulting communication paths between the sensitive sensor Element and the associated evaluating semiconductor element are as short as possible, so that the sensor information is not distorted and a high long-term stability of the arrangement is ensured.
  • a portion of the structure in the interior of the plastic housing surrounded by a gel because gels provide thermal and mechanical compensation and evenly distribute the mechanical stresses, so that a high long-term stability of the sensor parameters can be ensured because External influences that could cause a drift are better shielded.
  • the highly sensitive sensor element can be contacted by the gel, the sensor element and the region of the bonding wires, or the entire surrounding region of the sensor element, the semiconductor element and the bonding wires be surrounded by the gel.
  • the amount of gel inside the housing and that of the devices it contacts there increases, an improved match to the existing environmental conditions is achieved and stresses are more evenly distributed and dissipated.
  • a flip-chip connection z. B. used in the form of a ball grid array, because these secure contact and also the Passing sensitive sensor signals between the sensor element and the evaluating carrier element allows without jeopardizing the long-term stability of the compound.
  • a sensor which is produced by a manufacturing method according to the invention, because the manufacturing method according to the invention ensures that a sensor is constructed, which has a high long-term stability, uses a low-cost housing and provides accurate measurement results over its entire life.
  • the senor is designed as an inertial or inertial sensor, since there is a high demand in this market segment and these can be used well as cost-effective sensors in the automotive sector.
  • Fig. 1 shows a plan view of a sensor arrangement according to the prior art.
  • Fig. 2 shows a side view according to a sensor arrangement according to the prior art.
  • FIG. 3 shows a schematic diagram of a sensor component according to an exemplary embodiment of the invention.
  • Fig. 4 shows an embodiment of a sensor device according to the invention.
  • Fig. 5 shows another embodiment of a sensor device according to the invention.
  • FIG. 6 shows a further exemplary embodiment of a sensor component according to the invention.
  • FIGS. 1 and 2 show, a sensor element and a semiconductor element, which serves to evaluate the information of the data measured by the sensor, are arranged next to one another in a common housing 14.
  • the semiconductor element in the form of an evaluation electronics 11 is connected to the sensor element 10 via one or more bonding wires 12.
  • a low g-region acceleration sensor is shown, in which a semiconductor component which is custom-designed is used to process the sensor information and the sensor element has been designed using surface micromechanics.
  • the sensor element 10 here carries out its measurements by means of capacitive evaluation.
  • the connection of the sensor element 10 and the evaluation electronics 11, which is produced electrically via bonding wires 12 represents a disadvantage because the bonding wires generate additional parasitic capacitances and thus can have a direct influence on the behavior of the sensor.
  • FIG. 3 shows an exemplary embodiment of a sensor component according to the invention, wherein the sensor element, which is embodied as a micromechanical sensor element, for example with comb structures, is arranged vertically above the one carrier element.
  • the carrier element is preferably formed by evaluation electronics in the form of an application-specific semiconductor element 11.
  • the sensor element 10 and the carrier element 11 are connected to one another via an adhesive 13.
  • Adhesive in the form of an elastic cushion constructed, which decouples the sensitive sensor element 10 against mechanical stress by its elastic properties.
  • FIG. 3 clearly shows a flip-chip connection 19 between the sensor element 10 and the carrier element 11, via which the electrical connection between the two components is produced.
  • the cushion can be designed in this embodiment such that mechanical stresses can be compensated via the cushion, which can occur, for example, by different expansion coefficients of the sensor element 10 and the support member 11 under thermal stress.
  • ball grid arrays may be found to be reliable, soldered either via reflow soldering, or bonded through adhesive with special properties.
  • the bonding adhesive may be anisotropically conductive, or it may contract during cure, such that the ball of the ball grid array is pulled onto the corresponding opposite contact surface for safe contact making.
  • bumps which may for example comprise aluminum or gold wire, these are applied in the wire bonding process and then torn off directly at the bonding site.
  • Adhesive is applied to the substrate, in this case the evaluation electronics IC, and the chip is bonded via the adhesive. In this case, it is equally important to ensure a secure connection by shrinking during drying. the adhesive is used so that the bumps are pulled onto the contact surfaces of the semiconductor element.
  • bonding wires 12 are present, which connect the carrier element preferably present as a semiconductor element 18 with external contacts on the chip housing 15.
  • the sensitive sensor element 17 is arranged vertically above an evaluation electronics arranged on the carrier element and is electrically connected thereto. It is also clearly visible in a dome-like recess of the plastic housing 15, a gel region 16, which is in the case of this embodiment, only on the sensor element, wherein the gel provides for a thermal and mechanical compensation, so that thermal and mechanical stresses passed directly to the plastic housing 15 become.
  • FIG. 5 shows a further exemplary sensor component according to the invention, identical or identically acting components as in FIG. 4 being designated by the same reference numerals.
  • a larger gel area 16 is formed, wherein a dome-like recess in the plastic housing which accommodates the gel now encloses both the sensor element 17 and the surface of the carrier element 18 completely or partially covered, so that thermal stresses between these components on the gel 16 can be compensated as mechanical stresses that are passed in conjunction with the housing 15, the sensor element 17, and the evaluation circuit 18 optimally.
  • a gel may serve, for example, a silicone gel.
  • It can be used because it has excellent flowability and is able to fill in fine spaces while having excellent viscosity adhesion, sealing properties and resistance to liquid, and combines with high impact resistance. Being soft, it can be deformed by applying low pressure or light weight. Due to the low elasticity, a stress generated by thermal expansion is reduced.
  • Fig. 6 shows a further embodiment of a sensor device according to the invention. Also in Fig. 6, like-named components perform the same function as in the preceding figures.
  • the embodiment there has a very large gel area 16 in comparison with FIGS. 4 and 5, in contrast to which the area occupied by the plastic housing 15 is very small.
  • Characteristic of this embodiment is that both the evaluating application-specific circuit on the support element 18, and the sensitive sensor element 17 are now surrounded by the gel, so that an optimal temperature compensation can take place and mechanical stresses from outside via the housing to the sensor structure which can be compensated, balanced and passed on through the gel.
  • a long-term stable sensor is obtained, which combines a high measurement accuracy with a technically simple design and high long-term stability det, wherein the absolute values supplied by the sensor, for example acceleration values, are stable over the entire service life.
  • the senor according to the invention has the advantages that it is insensitive to influences by plastic, gel, or mechanical stress in the field of bonding wires in the signal path, which can be noticeable in the form of a modified dielectric constant, another bonding wire distance, or a moisture integrity , or by very sensitive exposed bonding wires that can be mechanically separated.
  • This is advantageous because an electrical connection according to the flip-chip technology is used in the region between the connection of the sensor to the evaluating semiconductor element.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pressure Sensors (AREA)
  • Structures Or Materials For Encapsulating Or Coating Semiconductor Devices Or Solid State Devices (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

The invention describes a sensor, a sensor component and a method for producing a sensor, in which sensors for measuring absolute values, in particular, can be introduced into cost-effective and technically simple plastic housings of conventional design without the long-term stability of absolute measured values which are provided by such sensors suffering. In particular, parameter drifts and offsets in the parameters are induced by arranging a sensor element above an application-specific semiconductor element which evaluates the signals from said sensor element and is connected to the latter by means of a flip-chip connection. Mechanical and thermal stresses and moisture are prevented and compensated for by introducing a suitable amount of gel into the plastic housing.

Description

2 6 . 0 9 . 20052 6. 0 9. 2005
ROBERT BOSCH GMBH, 70442 StuttgartROBERT BOSCH GMBH, 70442 Stuttgart
Sensor, Sensorbauelement und Verfahren zur Herstellung einesSensor, sensor component and method for producing a
Sensors .Sensors.
Stand der TechnikState of the art
Mit dem vermehrten Einzug der Elektronik in die Verkehrstechnik, insbesondere in die Automobiltechnik, steigt auch der Bedarf an unterstutzenden Sensoren, um Sicherheitsmerkmale und Komfortmerkmale im Automobilbau weiter und besser etab- lieren zu können. Eine besondere Bedeutung kommt hierbeiWith the advent of electronics in traffic engineering, especially in the automotive industry, the need for supporting sensors is increasing in order to further and better establish security features and comfort features in automotive engineering. A special meaning comes here
Drehratensensoren und Beschleunigungssensoren zu. Über derartige Sensoren können beispielsweise Kontroll- und Steuerungsfunktionen zur Sicherung der Stabilität eines Automobils gewahrleistet werden, wie dies z.B. durch elektronische Stabi- litatsprogramme (ESP) ermöglicht wird, die weit verbreitet sind. Damit solche Programme arbeiten können, müssen ihnen entsprechend verlassliche Sensordaten zur Verfugung stehen, um einen aktuellen Betriebszustand eines Kfz bewerten zu können und entsprechend angemessene Kontroll- und Steuerungsmaß- nahmen einleiten zu können.Rotation rate sensors and acceleration sensors too. Such sensors can be used, for example, to provide control and control functions to ensure the stability of an automobile, as e.g. Electronic Stability Programs (ESP) are widely used. In order for such programs to work, reliable sensor data must be available to them in order to be able to evaluate a current operating state of a motor vehicle and to be able to initiate appropriate control and control measures accordingly.
Speziell werden beispielsweise im Bereich von Airbagauslosun- gen bei einem Verkehrsunfall, bzw. einem definierten Zusammenprall von bestimmter Starke Beschleunigungssensoren ver- wendet, die einen Airbag auslosen, wenn eine bestimmte Verzögerung detektiert wird. Ein weiteres Beispiel sind Drehratensensoren, welche Kurvengeschwindigkeiten eines Kfz ermitteln und entsprechend koordinierte Bremsvorgange an den einzelnen Rädern einleiten, falls vom elektronischen Stabilitätsprogramm eine kritische Situation erkannt wird.Specifically, for example, in the area of airbag triggering in the event of a traffic accident or a defined collision of a certain strength, acceleration sensors are used which trigger an airbag when a specific deceleration is detected. Another example is yaw rate sensors, which determine cornering speeds of a motor vehicle and correspondingly coordinated braking action on the individual Initiate wheels if a critical situation is detected by the electronic stability program.
Häufig werden Sensoren eingesetzt, welche als mikromechani- sehe Bauteile gefertigt sind. Ein Beispiel eines Beschleunigungssensors ist in DE 10104868 beschrieben. Dort wird auch ein entsprechendes Herstellverfahren für ein derartiges Bauteil angegeben.Frequently, sensors are used which are manufactured as micromechanical components. An example of an acceleration sensor is described in DE 10104868. There is also given a corresponding manufacturing method for such a component.
Bei einigen der zuvor besprochenen Sensorelemente, die als Drehratensensor und Beschleunigungssensor ausgeführt sind, werden lediglich Relativgrößen und keine Absolutgrößen bestimmt und die Offsetgenauigkeit, d.h. eine Genauigkeit bezüglich eines Driftens der Betriebsparameter der Bauteile, ist im Anwendungsfall nicht erheblich, weil Relativgrößen zur Auswertung der Sensorinformation bestimmt werden und sich entsprechende Parameterverschiebungen im Auswertungsergebnis aufheben oder nicht stark auswirken. Beispiele für Ursachen derartiger Parameterverschiebungen sind Temperaturschwankun- gen, Schwankungen in den thermischen Ausdehnungskoeffizienten der verwendeten Bauteile, Feuchtigkeitseintritt in die Gehäuse, welche wiederum die Parameter der Sensormessung beeinflussen können und Spannungen, die auftreten, wenn die Sensoren in ein Gehäuse eingebaut werden.In some of the previously discussed sensor elements embodied as a rotation rate sensor and acceleration sensor, only relative quantities and no absolute values are determined and the offset accuracy, i. an accuracy with respect to a drift of the operating parameters of the components is not significant in the application, because relative variables are determined for the evaluation of the sensor information and cancel the corresponding parameter shifts in the evaluation result or not strong impact. Examples of causes of such parameter shifts are temperature fluctuations, variations in the coefficients of thermal expansion of the components used, moisture penetration into the housings, which in turn can affect the parameters of the sensor measurement and voltages that occur when the sensors are installed in a housing.
Kostengünstige Kunststoffgehäuse wie PLCC (Plastic Leaded Chip Carrier) , SOIC (Small Outline IC), QFN und SO (Small Outline) weisen bei Sensoranwendungen Nachteile auf. Diese Gehäuse erzeugen Störeinflüsse beispielsweise in Form mecha- nischer Belastungen, welche durch die Materialpaarung Kunststoff-Silizium und die verschiedenen thermischen Ausdehnungskoeffizienten dieser Materialien bewirkt werden. Auch können nachteilige Eigenschaften dieser Gehäuse eine Wechselwirkung von mehreren darin angeordneten und zusammenarbeitenden Komponenten negativ beeinflussen.Cost-effective plastic enclosures such as Plastic Leaded Chip Carrier (PLCC), Small Outline IC (SOIC), Small Outline (QFN), and Small Outline (SO) have disadvantages in sensor applications. These housings generate disturbing influences, for example in the form of mechanical loads, which are brought about by the material combination of plastic-silicon and the different thermal expansion coefficients of these materials. Also, adverse properties of these packages can adversely affect an interaction of multiple components disposed therein and cooperating.
Dies gilt zum Beispiel für die Wechselwirkung zwischen einem im Gehäuse angeordneten Sensor und einem Halbleiterelement, welches die Messdaten des Sensors verarbeitet und für eine nachfolgende Auswertung aufbereitet. Beispielsweise können beim Kunststoffgehäuse ein Kunststoff oder ein Gelmaterial mit Alterungsfeuchteaufnahme und Temperatureffekten eine Rolle spielen. Eine derartige Veränderung der Umgebung kann zu Parameterdriften in Ausgaben der umschlossenen Bauelemente führen. Dies gilt speziell in Bezug auf Erwärmung, Alterungseffekte, Hysteresen.This applies, for example, to the interaction between a sensor arranged in the housing and a semiconductor element which processes the measured data of the sensor and prepares it for a subsequent evaluation. For example, in the plastic housing, a plastic or a gel material with aging moisture absorption and temperature effects play a role. Such a change in environment may result in parameter drifts in outputs of the enclosed devices. This applies especially with regard to heating, aging effects, hysteresis.
Beim Einsatz derzeitiger Technologien können also an offset- stabile Sensoren, wenn Plastikverpackungen verwendet werden, keine hohen Anforderungen an die Driftstabilität gestellt werden. Besonders gilt dies in Bezug auf die Temperatur und ebenso die Lebensdauer des Sensorelementes. Stattdessen müssen sehr teure Gehäuse, z.B. keramische Gehäuse, verwendet werden, welche das Endprodukt wiederum verteuern. Folglich besteht ein großer Bedarf an kostengünstig herstellbaren Sensorelementen, insbesondere mikromechanischen Sensorelementen, die eine hohe Langzeitstabilität, praktisch keinen Offset aufweisen und eine hohe Messgenauigkeit für absolute Messgrößen über ihre gesamte Lebensdauer bieten.With the use of current technologies, therefore, offset-stable sensors, when plastic packaging is used, can not be subject to high drift stability requirements. This applies in particular with regard to the temperature and also the service life of the sensor element. Instead, very expensive housings, e.g. ceramic housings are used, which in turn make the end product more expensive. Consequently, there is a great need for cost-effectively manufacturable sensor elements, in particular micromechanical sensor elements, which have a high long-term stability, virtually no offset and offer a high measurement accuracy for absolute measurements over their entire life.
Die der Erfindung zugrunde liegende Aufgabe besteht darin, einen Sensor, ein Sensorbauelement und ein Verfahren zur Herstellung eines Sensors anzugeben, die mit herkömmlichen, technisch einfachen Gehäusen realisierbar sind, und nicht die Nachteile des bekannten Standes der Technik aufweisen. Diese Aufgabe wird durch ein Sensorbauelement gemäß den Merkmalen des Patentanspruches 1, durch ein Verfahren zur Herstellung eines Sensors gemäß den Merkmalen des Patentanspru- ches 10 und einen Sensor gemäß den Merkmalen des Patentanspruches 15 gelöst.The object underlying the invention is to provide a sensor, a sensor component and a method for producing a sensor, which can be realized with conventional, technically simple housings, and do not have the disadvantages of the known prior art. This object is achieved by a sensor component according to the features of patent claim 1, by a method for producing a sensor according to the features of patent claim 10 and a sensor according to the features of patent claim 15.
Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen. Besonders vorteilhaft werden gemäß dem erfindungsgemäßen Sensorbauelement das Sensorelement und das zugeordnete Trägerelement, bevorzugt in der Form einer zugeordneten Auswerteelektronik in Form eines anwendungsspezifischen Halbleiterelementes vorliegend, übereinander angeordnet und über eine kurze Verbindung miteinander verbunden. Auf diese Weise sind die Verbindungswege zwischen den aktiven Bauelementen kurz und kapazitive Einflüsse, welche die Auswertung der Sensorinformation nachteilig beeinflussen und die über die Verbindungsdrähte hervorgerufen werden, werden verringert.Advantageous developments of the invention will become apparent from the dependent claims. According to the sensor component according to the invention, the sensor element and the associated carrier element, preferably present in the form of an associated evaluation electronics in the form of an application-specific semiconductor element, are arranged particularly advantageously above one another and connected to one another via a short connection. In this way, the connection paths between the active devices are short and capacitive influences which adversely affect the evaluation of the sensor information and which are caused via the connecting wires are reduced.
Vorteilhaft wird im Zwischenbereich der Anordnung ein elastisches Pufferelement, insbesondere ein Klebstoffkissen, angeordnet, welches das Sensorelement befestigt und gleichzeitig wegen seiner elastischen Eigenschaften vor mechanischen Umge- bungseinflüssen entkoppelt.Advantageously, in the intermediate region of the arrangement, an elastic buffer element, in particular an adhesive pad, is arranged, which secures the sensor element and at the same time decouples it from mechanical environmental influences because of its elastic properties.
Vorteilhaft wird die erste Verbindung gemäß einer Weiterbildung der erfindungsgemäßen Struktur nach Flip-Chip-Art ausgeführt.Advantageously, the first connection is executed according to a development of the structure according to the invention in a flip-chip manner.
Vorteilhaft kommen lediglich zur elektrischen Verbindung des Sensorbauelementes nach außen Bonddrähte zum Einsatz, dadurch werden komplizierte Fertigungsschritte auf ein Minimum reduziert .Advantageously, bonding wires are used only for the electrical connection of the sensor component to the outside, thereby complicated production steps are reduced to a minimum.
Vorteilhaft wird bei einer Weiterbildung des erfindungsgemä- ßen Sensorbauelementes ein Teilbereich des Sensorelementes von einem Gel kontaktiert, das thermische und mechanische Einflüsse im Bereich des empfindlichen Sensorelementes kompensiert. Auf diese Art und Weise wird eine Langzeitstabilität der Messergebnisse des Sensorelementes sicherstellt, wo- bei innerhalb des Gehäuses eine hohe mechanische Stabilität trotz des Kunststoffgehäuses sichergestellt wird, weil ein Gel die mechanischen und thermischen Beanspruchungen gleichmäßig verteilt.In a development of the sensor component according to the invention, a partial region of the sensor element is advantageously contacted by a gel which compensates for thermal and mechanical influences in the region of the sensitive sensor element. In this way, a long-term stability of the measurement results of the sensor element is ensured, whereby a high mechanical stability is ensured within the housing despite the plastic housing, because a gel evenly distributes the mechanical and thermal stresses.
Vorteilhaft kontaktiert das Gel ebenfalls das Kunststoffge- häuse, da so eine optimaler Ausgleich von thermischen und mechanischen Beanspruchungen ermöglicht wirdAdvantageously, the gel also contacts the plastic housing, since this optimally compensates for thermal and mechanical stresses
Vorteilhaft kontaktiert das Gel ebenfalls das Trägerelement, da so eine noch bessere Angleichung der Bedingungen im inneren des Gehäuses in Bezug auf die dort vorhandenen Bauelemente erfolgt und der Ausgleich von thermischen und mechanischen Beanspruchungen noch optimaler ermöglicht wird.Advantageously, the gel also contacts the carrier element, since an even better approximation of the conditions in the interior of the housing takes place with respect to the components present there and the compensation of thermal and mechanical stresses is made even more optimal.
Vorteilhaft wird eine Flip-Chip-Verbindung als Ball Grid Ar- ray ausgeführt, da Ball Grid Arrays sich in der Praxis bewährt haben und eine gute Verbindung zwischen den Bauteilen herstellen .Advantageously, a flip-chip connection is performed as a ball grid array, since ball grid arrays have proven themselves in practice and produce a good connection between the components.
Vorteilhaft wird zur Kontaktierung zwischen dem Sensorelement und dem auswertenden Trägerelement leitfähiger Klebstoff verwendet, wobei vorteilhaft dieser leitfähige Klebstoff auch ein anisotrop leitender Klebstoff sein kann. Vorteilhaft wird das Sensorelement mit dem Trägerelement über Reflow-Löten verlötet, da auf diese Art und Weise im Bereich der Verbindung zwischen den Chipelementen keine Langzeitein- flüsse auftreten.Advantageously, conductive adhesive is used for contacting between the sensor element and the evaluating carrier element, wherein advantageously this conductive adhesive may also be an anisotropically conductive adhesive. Advantageously, the sensor element is soldered to the carrier element via reflow soldering, since no long-term influences occur in this way in the region of the connection between the chip elements.
Besonders vorteilhaft ist bei einer Weiterbildung der erfindungsgemäßen Sensorbauelementes das Sensorelement als mikromechanisches Sensorelement ausgeführt, weil derartige Sensor- elemente genau messen und kostengünstig in großen Mengen herzustellen sind.In a refinement of the sensor component according to the invention, the sensor element is particularly advantageously designed as a micromechanical sensor element, because such sensor elements can be accurately measured and produced inexpensively in large quantities.
Besonders vorteilhaft ist bei einer Weiterbildung der erfindungsgemäßen Sensorstruktur das Trägerelement als ein anwen- dungsspezifisches Halbleiterelement zur Aufbereitung von Sensorinformationen des ersten Sensorelementes ausgeführt, da auf diese Weise beide Bestandteile des Sensors optimal aufeinander abgestimmt werden können und den besonderen Bedürfnissen der jeweiligen Bauelemente in Bezug auf mechanische, thermische und elektrische Langzeitstabilität besonders Rechnung getragen wird.In a development of the sensor structure according to the invention, the carrier element is particularly advantageously designed as an application-specific semiconductor element for processing sensor information of the first sensor element, since in this way both components of the sensor can be optimally matched to each other and the particular needs of the respective components with respect to mechanical , thermal and electrical long-term stability is particularly taken into account.
Vorteilhaft wird bei einem Verfahren zur Herstellung eines Sensors gemäß der Erfindung sichergestellt, dass eine hochge- nau messende langzeitstabile Struktur entsteht, die aus einem Sensorelement und einem Trägerelement, bevorzugt in der Form eines auswertenden Halbleiterelementes vorliegend, besteht, wobei vorteilhaft lediglich das auswertende Halbleiterelement über Bonddrähte mit Anschlusspins des Chipgehäuses nach außen verbunden ist, wobei aber trotzdem ein kostengünstiges und technisch einfaches Kunststoffgehäuse verwendet werden kann. In diesem Zusammenhang ist es ebenso wichtig, dass die entstehenden Verbindungswege zwischen dem empfindlichen Sensor- element und dem zugeordneten auswertenden Halbleiterelement möglichst kurz sind, damit die Sensorinformationen nicht verfälscht werden und eine hohe Langzeitstabilität der Anordnung gewährleistet wird.Advantageously, in a method for producing a sensor according to the invention, it is ensured that a highly accurate, long-term stable structure is formed which consists of a sensor element and a carrier element, preferably present in the form of an evaluating semiconductor element, wherein advantageously only the evaluating semiconductor element Bonding wires with connection pins of the chip housing is connected to the outside, but nevertheless a cost-effective and technically simple plastic housing can be used. In this context, it is equally important that the resulting communication paths between the sensitive sensor Element and the associated evaluating semiconductor element are as short as possible, so that the sensor information is not distorted and a high long-term stability of the arrangement is ensured.
Vorteilhaft wird bei einer Weiterbildung des erfindungsgemäßen Herstellverfahrens ein Teilbereich der Struktur im Inneren des Kunststoffgehäuses von einem Gel umgeben, weil Gele für einen thermischen und mechanischen Ausgleich sorgen und die mechanischen Beanspruchungen gleichmäßig verteilen, so- dass eine hohe Langzeitstabilität der Sensorparameter sichergestellt werden kann, denn äußere Einflüsse, die eine Drift bewirken könnten, werden besser abgeschirmt.Advantageously, in a development of the manufacturing method according to the invention, a portion of the structure in the interior of the plastic housing surrounded by a gel because gels provide thermal and mechanical compensation and evenly distribute the mechanical stresses, so that a high long-term stability of the sensor parameters can be ensured because External influences that could cause a drift are better shielded.
Durch einen Einsatz von mehr oder weniger Gel und ein Innen- raumvolumen des Gehäuses das an die Gelmenge angepasst ist, durch entsprechende Aussparungen im Gehäuse ist es möglich, den Innenaufbau des Gehäuses an die jeweiligen Erfordernisse des Einsatzes anzupassen.By using more or less gel and an interior volume of the housing which is adapted to the amount of gel, by corresponding recesses in the housing, it is possible to adapt the internal structure of the housing to the respective requirements of the use.
Vorteilhaft kann lediglich das hochempfindliche Sensorelement vom Gel kontaktiert sein, das Sensorelement und der Bereich der Bonddrähte, oder der gesamte Umgebungsbereich des Sensorelementes, des Halbleiterelementes und der Bonddrähte vom Gel umgeben sein. In dem Masse indem die Menge des Gels im inneren des Gehäuses und die der von ihm dort kontaktierten Bauelemente anwächst, wird ein verbesserter Angleich an die vorhandenen Umgebungsbedingungen erreicht und werden Beanspruchungen gleichmäßiger verteilt und abgeleitet.Advantageously, only the highly sensitive sensor element can be contacted by the gel, the sensor element and the region of the bonding wires, or the entire surrounding region of the sensor element, the semiconductor element and the bonding wires be surrounded by the gel. As the amount of gel inside the housing and that of the devices it contacts there increases, an improved match to the existing environmental conditions is achieved and stresses are more evenly distributed and dissipated.
Vorteilhaft wird beim erfindungsgemäßen Herstellverfahren eine Flip-Chip-Verbindung z. B. in Form eines Ball Grid Arrays verwendet, weil diese eine sichere Kontaktierung und auch die Weitergabe empfindlicher Sensorsignale zwischen dem Sensorelement und dem auswertenden Trägerelement ermöglicht, ohne dabei die Langzeitstabilität der Verbindung zu gefährden.Advantageously, a flip-chip connection z. B. used in the form of a ball grid array, because these secure contact and also the Passing sensitive sensor signals between the sensor element and the evaluating carrier element allows without jeopardizing the long-term stability of the compound.
Besonders vorteilhaft ist ein Sensor, der nach einem erfindungsgemäßen Herstellverfahren hergestellt wird, weil das Herstellverfahren gemäß der Erfindung sicherstellt, dass ein Sensor aufgebaut wird, der eine hohe Langzeitstabilität aufweist, ein kostengünstiges Gehäuse verwendet und genaue Mess- ergebnisse über seine gesamte Lebensdauer liefert.Particularly advantageous is a sensor which is produced by a manufacturing method according to the invention, because the manufacturing method according to the invention ensures that a sensor is constructed, which has a high long-term stability, uses a low-cost housing and provides accurate measurement results over its entire life.
Vorteilhaft wird eine Weiterbildung des Sensors als Inertial- oder Trägheitssensor ausgeführt, da in diesem Marktsegment ein hoher Bedarf besteht und diese als kostengünstige Senso- ren im Automobilbereich gut einsetzbar sind.Advantageously, a further development of the sensor is designed as an inertial or inertial sensor, since there is a high demand in this market segment and these can be used well as cost-effective sensors in the automotive sector.
Im folgenden werden Ausführungsbeispiele der Erfindung anhand von Figuren weiter erläutert.In the following embodiments of the invention will be explained with reference to figures.
Fig. 1 zeigt eine Draufsicht auf eine Sensoranordnung gemäß dem Stand der Technik.Fig. 1 shows a plan view of a sensor arrangement according to the prior art.
Fig. 2 zeigt eine Seitenansicht gemäß einer Sensoranordnung gemäß dem Stand der Technik.Fig. 2 shows a side view according to a sensor arrangement according to the prior art.
Fig. 3 zeigt eine Prinzipskizze eines Sensorbauelementes gemäß einem Ausführungsbeispiel der Erfindung.3 shows a schematic diagram of a sensor component according to an exemplary embodiment of the invention.
Fig. 4 zeigt ein Ausführungsbeispiel eines Sensorbauelementes gemäß der Erfindung. Fig. 5 zeigt ein weiteres Ausführungsbeispiel eines Sensorbauelementes gemäß der Erfindung undFig. 4 shows an embodiment of a sensor device according to the invention. Fig. 5 shows another embodiment of a sensor device according to the invention and
Fig. 6 zeigt ein weiteres Ausführungsbeispiel eines Sensor- bauelementes gemäß der Erfindung.6 shows a further exemplary embodiment of a sensor component according to the invention.
Wie die Figuren 1 und 2 zeigen, sind ein Sensorelement und ein Halbleiterelement, das der Auswertung der Information der vom Sensor gemessenen Daten dient in einem gemeinsamen Gehäu- se 14 nebeneinander angeordnet. Das Halbleiterelement in Form einer Auswerteelektronik 11 ist mit dem Sensorelement 10 über einen oder mehrere Bonddrähte 12 verbunden. In diesem Beispiel wird ein Beschleunigungssensor für niedrige g-Bereiche gezeigt, bei dem ein Halbleiterbauelement, das kundenspezi- fisch ausgeführt ist, die Sensorinformation weiterverarbeitet und das Sensorelement über Oberflächenmikromechanik ausgelegt wurde. Das Sensorelement 10 führt hier seine Messungen mittels kapazitiver Auswertung durch. In dieser Hinsicht stellt die Verbindung des Sensorelementes 10 und der Auswerteelekt- ronik 11, die elektrisch über Bonddrähte 12 hergestellt wird, einen Nachteil dar, weil die Bonddrähte zusätzliche parasitäre Kapazitäten erzeugen, und damit einen direkten Einfluss auf das Verhalten des Sensors haben können.As FIGS. 1 and 2 show, a sensor element and a semiconductor element, which serves to evaluate the information of the data measured by the sensor, are arranged next to one another in a common housing 14. The semiconductor element in the form of an evaluation electronics 11 is connected to the sensor element 10 via one or more bonding wires 12. In this example, a low g-region acceleration sensor is shown, in which a semiconductor component which is custom-designed is used to process the sensor information and the sensor element has been designed using surface micromechanics. The sensor element 10 here carries out its measurements by means of capacitive evaluation. In this regard, the connection of the sensor element 10 and the evaluation electronics 11, which is produced electrically via bonding wires 12, represents a disadvantage because the bonding wires generate additional parasitic capacitances and thus can have a direct influence on the behavior of the sensor.
Fig. 3 zeigt ein Ausführungsbeispiel eines erfindungsgemäßen Sensorbauelementes, wobei das Sensorelement, das als mikromechanisches Sensorelement, beispielsweise mit Kammstrukturen ausgeführt ist, vertikal über der einem Trägerelement angeordnet ist. Bevorzugt wird das Trägerelement von einer Aus- werteelektronik in Form eines anwendungsspezifischen Halbleiterelementes 11 gebildet. Wie in Fig. 3 und 4 dargestellt, sind das Sensorelement 10 und das Trägerelement 11 über einen Klebstoff 13 miteinander verbunden. Vorteilhaft ist der Klebstoff in Form eines elastischen Kissens aufgebaut, das durch seine elastischen Eigenschaften das empfindliche Sensorelement 10 vor mechanische Belastung entkoppelt. Weiterhin ist in Fig. 3 deutlich eine Flip-Chip-Verbindung 19 zwischen dem Sensorelement 10 und dem Trägerelement 11 zu erkennen, über welche die elektrische Verbindung zwischen den beiden Bauteilen hergestellt wird.3 shows an exemplary embodiment of a sensor component according to the invention, wherein the sensor element, which is embodied as a micromechanical sensor element, for example with comb structures, is arranged vertically above the one carrier element. The carrier element is preferably formed by evaluation electronics in the form of an application-specific semiconductor element 11. As shown in FIGS. 3 and 4, the sensor element 10 and the carrier element 11 are connected to one another via an adhesive 13. It is advantageous Adhesive in the form of an elastic cushion constructed, which decouples the sensitive sensor element 10 against mechanical stress by its elastic properties. Furthermore, FIG. 3 clearly shows a flip-chip connection 19 between the sensor element 10 and the carrier element 11, via which the electrical connection between the two components is produced.
Das Kissen kann in dieser Ausführungsform derart ausgelegt werden, dass mechanische Spannungen über das Kissen kompensiert werden können, die beispielsweise durch unterschiedliche Ausdehnungskoeffizienten des Sensorelementes 10 und des Trägerelementes 11 bei thermischer Beanspruchung auftreten können .The cushion can be designed in this embodiment such that mechanical stresses can be compensated via the cushion, which can occur, for example, by different expansion coefficients of the sensor element 10 and the support member 11 under thermal stress.
Als Flip-Chip-Verbindungen haben sich in der Praxis z. B. Ball Grid Arrays als zuverlässig herausgestellt, die entweder über Reflow-Löten angelötet werden, oder aber durch Klebstoff mit speziellen Eigenschaften für eine Verbindung sor- gen. Beispielsweise kann der Verbindungsklebstoff anisotrop leitend sein, oder er kann sich während des Aushärtens zusammenziehen, sodass die Kugel des Ball Grid Arrays auf die entsprechende gegenüberliegende Kontaktfläche zur sicheren Herstellung eines Kontaktes gezogen wird. Es besteht auch die Möglichkeit, eine Verbindung über nicht leitfähigen Kleber herzustellen, wobei die Kontakte des Sensors mit sogenannten Bumps versehen werden, welche beispielsweise Aluminium oder Golddraht aufweisen können, diese werden im Drahtbondverfahren aufgebracht und dann direkt an der Bondstelle abgerissen. Auf das Substrat, in diesem Falle die Auswerteelektronik IC wird Kleber aufgebracht und der Chip wird über den Kleber ge- bondet. In diesem Fall ist es ebenso wichtig, für eine sichere Verbindung zu sorgen, indem ein beim Trocknen schrumpfen- der Kleber verwendet wird, sodass die Bumps auf die Kontaktflächen des Halbleiterelementes gezogen werden.As flip-chip connections have z. For example, ball grid arrays may be found to be reliable, soldered either via reflow soldering, or bonded through adhesive with special properties. For example, the bonding adhesive may be anisotropically conductive, or it may contract during cure, such that the ball of the ball grid array is pulled onto the corresponding opposite contact surface for safe contact making. It is also possible to make a connection via non-conductive adhesive, wherein the contacts of the sensor are provided with so-called bumps, which may for example comprise aluminum or gold wire, these are applied in the wire bonding process and then torn off directly at the bonding site. Adhesive is applied to the substrate, in this case the evaluation electronics IC, and the chip is bonded via the adhesive. In this case, it is equally important to ensure a secure connection by shrinking during drying. the adhesive is used so that the bumps are pulled onto the contact surfaces of the semiconductor element.
Fig. 4 zeigt ein Ausführungsbeispiel eines erfindungsgemäßen Sensors. Wie deutlich zu erkennen ist, sind Bonddrähte 12 vorhanden, welche das bevorzugt als Halbleiterelement 18 vorliegende Trägerelement mit Außenkontakten am Chipgehäuse 15 verbinden. Das empfindliche Sensorelement 17 ist hier vertikal über einer auf dem Trägerelement angeordneten Auswerte- elektronik angeordnet und mit dieser elektrisch verbunden. Deutlich ist ebenfalls in einer domartigen Ausnehmung des Kunststoffgehäuses 15 ein Gelbereich 16 zu erkennen, der sich im Fall dieses Ausführungsbeispiels lediglich auf dem Sensorelement befindet, wobei das Gel für einen thermischen und mechanischen Ausgleich sorgt, sodass thermische und mechanische Beanspruchungen direkt an das Kunststoffgehäuse 15 weitergegeben werden.4 shows an exemplary embodiment of a sensor according to the invention. As can be clearly seen, bonding wires 12 are present, which connect the carrier element preferably present as a semiconductor element 18 with external contacts on the chip housing 15. Here, the sensitive sensor element 17 is arranged vertically above an evaluation electronics arranged on the carrier element and is electrically connected thereto. It is also clearly visible in a dome-like recess of the plastic housing 15, a gel region 16, which is in the case of this embodiment, only on the sensor element, wherein the gel provides for a thermal and mechanical compensation, so that thermal and mechanical stresses passed directly to the plastic housing 15 become.
Fig. 5 zeigt ein weiteres beispielhaftes Sensorbauelement ge- maß der Erfindung, wobei gleiche oder gleich wirkende Bauteile wie in Fig. 4 mit denselben Bezugszeichen bezeichnet sind. Deutlich ist hier zu erkennen, dass im Bereich des Sensorelementes 17 und des Trägerelementes mit auswertendem Halbleiterbauelement 18 ein größerer Gelbereich 16 ausgeformt ist, wobei eine domartige Ausnehmung im Kunststoffgehäuse, welche das Gel aufnimmt nun sowohl das Sensorelement 17 umschließt, als auch die Oberfläche des Trägerelementes 18 ganz oder teilweise bedeckt, sodass ebenso thermische Beanspruchungen zwischen diesen Bauteilen über das Gel 16 kompensiert werden können, wie mechanische Beanspruchungen, die in Verbindung mit dem Gehäuse 15, dem Sensorelement 17, und der Auswerteschaltung 18 optimal weitergeleitet werden. Als Beispiel für ein solches Gel kann z.B. ein Silikongel dienen. Es kann verwendet werden, weil es eine ausgezeichnete Fließbarkeit aufweist und dazu in der Lage ist, feine Zwischenräume auszufüllen, wobei es gleichzeitig exzellente Viskositätsanhaftung, Dichtungseigenschaften und Widerstand gegen Flüssigkeit aufweist und dies mit einer hohen Stoßsicherheit verbindet. Indem es weich ist, kann es durch Anwendung geringen Drucks oder von kleinem Gewicht verformt werden. Aufgrund der niedrigen Elastizität wird eine Spannung, die durch thermische Ausdehnung erzeugt wird, vermindert.FIG. 5 shows a further exemplary sensor component according to the invention, identical or identically acting components as in FIG. 4 being designated by the same reference numerals. It can clearly be seen here that in the area of the sensor element 17 and the carrier element with evaluating semiconductor component 18, a larger gel area 16 is formed, wherein a dome-like recess in the plastic housing which accommodates the gel now encloses both the sensor element 17 and the surface of the carrier element 18 completely or partially covered, so that thermal stresses between these components on the gel 16 can be compensated as mechanical stresses that are passed in conjunction with the housing 15, the sensor element 17, and the evaluation circuit 18 optimally. As an example of such a gel may serve, for example, a silicone gel. It can be used because it has excellent flowability and is able to fill in fine spaces while having excellent viscosity adhesion, sealing properties and resistance to liquid, and combines with high impact resistance. Being soft, it can be deformed by applying low pressure or light weight. Due to the low elasticity, a stress generated by thermal expansion is reduced.
Fig. 6 zeigt ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Sensorbauelementes. Auch in Fig. 6 erfüllen gleich bezeichnete Bauelemente die gleiche Funktion wie in den vorangehenden Figuren.Fig. 6 shows a further embodiment of a sensor device according to the invention. Also in Fig. 6, like-named components perform the same function as in the preceding figures.
Wie in Fig. 6 deutlich zu erkennen ist, weist die dortige Ausführungsform im Vergleich mit den Figuren 4 und 5 einen sehr großen Gelbereich 16 auf, wobei im Gegensatz dazu der Bereich den das Kunststoffgehäuse 15 einnimmt sehr klein ist. Charakteristisch für diese Ausführungsform ist, dass sowohl der auswertende anwendungsspezifische Schaltkreis auf dem Trägerelement 18, als auch das empfindliche Sensorelement 17 nun vom Gel umgeben sind, sodass ein optimaler Temperaturaus- gleich stattfinden kann und mechanische Beanspruchungen, die von außen über das Gehäuse auf die Sensorstruktur einwirken, über das Gel kompensiert, ausgeglichen und weitergeleitet werden können.As can be seen clearly in FIG. 6, the embodiment there has a very large gel area 16 in comparison with FIGS. 4 and 5, in contrast to which the area occupied by the plastic housing 15 is very small. Characteristic of this embodiment is that both the evaluating application-specific circuit on the support element 18, and the sensitive sensor element 17 are now surrounded by the gel, so that an optimal temperature compensation can take place and mechanical stresses from outside via the housing to the sensor structure which can be compensated, balanced and passed on through the gel.
Zusammenfassend ist also zu sagen, dass durch den Aufbau des Sensorbauelementes gemäß der Erfindung ein langzeitstabiler Sensor erhalten wird, der eine hohe Messgenauigkeit mit technisch einfachem Aufbau und hoher Langzeitstabilität verbin- det, wobei die vom Sensor gelieferten Absolutwerte, beispielsweise Beschleunigungswerte, über die gesamte Lebensdauer stabil sind.In summary, therefore, to say that the structure of the sensor device according to the invention, a long-term stable sensor is obtained, which combines a high measurement accuracy with a technically simple design and high long-term stability det, wherein the absolute values supplied by the sensor, for example acceleration values, are stable over the entire service life.
Insbesondere weist der Sensor gemäß der Erfindung die Vorteile auf, dass er unempfindlich ist gegenüber Einflüssen durch Kunststoff, Gel, oder mechanische Beanspruchung im Bereich der Bonddrähte im Signalpfad, die sich in Form einer veränderten Dielektrizitätszahl, eines anderen Bonddrahtabstandes, oder eines Feuchtenebenschlusses bemerkbar machen können, oder durch sehr empfindliche offen liegende Bonddrähte, die mechanisch getrennt werden können. Dies liegt vorteilhaft daran, dass im Bereich zwischen der Verbindung des Sensors mit dem auswertenden Halbleiterelement eine elektrische Ver- bindung nach der Flip-Chip-Technologie eingesetzt wird. In particular, the sensor according to the invention has the advantages that it is insensitive to influences by plastic, gel, or mechanical stress in the field of bonding wires in the signal path, which can be noticeable in the form of a modified dielectric constant, another bonding wire distance, or a moisture integrity , or by very sensitive exposed bonding wires that can be mechanically separated. This is advantageous because an electrical connection according to the flip-chip technology is used in the region between the connection of the sensor to the evaluating semiconductor element.

Claims

Patentansprüche claims
1. Sensorbauelement, wobei ein Sensorelement (17) und ein Trägerelement (18) übereinan- der angeordnet sind und in einem Zwischenbereich elektrisch über eine Verbindungsart (19) miteinander verbunden sind, wobei, das Sensorelement (17) und das Trägerelement (18) von einem Gehäuse (15) umgeben sind.Sensor element, wherein a sensor element (17) and a carrier element (18) are arranged one above the other and electrically connected in an intermediate region via a connection (19), wherein, the sensor element (17) and the carrier element (18) of a housing (15) are surrounded.
2. Sensorbauelement nach Anspruch 1, bei dem im Zwischenbereich ein elastischer Puffer, insbesondere in Form eines Klebstoffkissens, (13) angeordnet ist.2. Sensor device according to claim 1, wherein in the intermediate region an elastic buffer, in particular in the form of an adhesive pad, (13) is arranged.
3. Sensorbauelement nach einem der Ansprüche 1 bis 2, bei dem die Verbindungsart (19) als Flipchip-Verbindung ausgeführt ist .3. Sensor device according to one of claims 1 to 2, wherein the connection type (19) is designed as a flip-chip connection.
4. Sensorbauelement nach einem der Ansprüche 1 bis 3, bei dem das Trägerelement (18) über Bonddrähte (12) mit Außenkontakten verbunden ist, die das Trägerelement (18) durch das Gehäuse (15) hindurch elektrisch mit äußeren Kontaktflächen verbinden .4. Sensor device according to one of claims 1 to 3, wherein the carrier element (18) via bonding wires (12) is connected to external contacts which electrically connect the carrier element (18) through the housing (15) through to outer contact surfaces.
5. Sensorbauelement nach einem der Ansprüche 1 bis 4, bei dem zwischen wenigstens ein Teilbereich des Sensorelementes (17) und dem Gehäuse (15) ein Gel (16) angeordnet ist.5. Sensor component according to one of claims 1 to 4, wherein between at least a portion of the sensor element (17) and the housing (15) a gel (16) is arranged.
6. Sensorbauelement nach Anspruch 5, bei dem das Gel das Sen- sorelement umschließt und eine Oberfläche des Trägerelementes zumindest teilweise bedeckt. 6. Sensor component according to claim 5, in which the gel surrounds the sensor element and at least partially covers a surface of the carrier element.
7. Sensorbauelement nach einem der Ansprüche 5 bis 6, bei dem das Gel das Trägerelement (18) und das Sensorelement umschließt .7. Sensor device according to one of claims 5 to 6, wherein the gel surrounds the carrier element (18) and the sensor element.
8. Sensorbauelement nach einem der Ansprüche 1 bis 7, bei der das Sensorelement (17) ein mikromechanisches Sensorelement ist .8. Sensor component according to one of claims 1 to 7, wherein the sensor element (17) is a micromechanical sensor element.
9. Sensorbauelement nach einem der Ansprüche 1 bis 8, bei dem das Trägerelement (18) ein anwendungsspezifisches Halbleiterelement zur Aufbereitung von Sensorsignalen des Sensorelementes (17) umfasst.9. Sensor component according to one of claims 1 to 8, wherein the carrier element (18) comprises an application-specific semiconductor element for processing of sensor signals of the sensor element (17).
10. Verfahren zur Herstellung eines Sensors mit folgen- den Schritten:10. A method of manufacturing a sensor comprising the following steps:
- Herstellung eines Sensorelements (17),- Production of a sensor element (17),
- Herstellung eines Trägerelements (18),- production of a carrier element (18),
- Verbinden des Sensorelements (17) und des Trägerelements (18) nach Flip-Chip-Art (19) miteinander, - Einbringung des Sensorelements (17) und des Trägerelements (18) in ein Gehäuse (15) .- Connecting the sensor element (17) and the support member (18) according to flip-chip-type (19) with each other, - Insertion of the sensor element (17) and the support member (18) in a housing (15).
11. Verfahren zur Herstellung eines Sensors nach Anspruch 10, bei dem das Trägerelement (18) über Bonddrähte (12) mit elektrischen Verbindungen zu äußeren Kontaktflächen verbunden wird.11. A method for producing a sensor according to claim 10, wherein the carrier element (18) via bonding wires (12) is connected to electrical connections to outer contact surfaces.
12. Verfahren zur Herstellung eines Sensors nach einem der Ansprüche 10 bis 11, bei dem zwischen dem Gehäuse (15) und zumindest einem Teil des Sensorelementes (17) ein Gel (16) angeordnet wird. 12. A method for producing a sensor according to any one of claims 10 to 11, wherein between the housing (15) and at least a part of the sensor element (17), a gel (16) is arranged.
13. Verfahren zur Herstellung eines Sensors nach Anspruch 12, bei dem das Gel (16) das Sensorelement (17) umschließt und eine Oberfläche der Trägerelemente zumindest teilweise bedeckt.13. A method of manufacturing a sensor according to claim 12, wherein the gel (16) encloses the sensor element (17) and at least partially covers a surface of the carrier elements.
14. Verfahren zur Herstellung eines Sensors nach einem der Ansprüche 12 bis 13, bei dem das Gel so angeordnet wird, dass es das Sensorelement (17) und das Trägerelement (18) umschließt .14. A method of manufacturing a sensor according to any one of claims 12 to 13, wherein the gel is arranged so as to surround the sensor element (17) and the carrier element (18).
15. Sensor, der nach einem Herstellverfahren gemäß einem der Ansprüche 9 bis 13 hergestellt wird.15. Sensor, which is produced by a manufacturing method according to any one of claims 9 to 13.
16. Sensor nach Anspruch 14, der als Inertialsensor ausgeführt ist. 16. Sensor according to claim 14, which is designed as an inertial sensor.
EP06807779A 2005-11-10 2006-11-08 Sensor, sensor component and method for producing a sensor Withdrawn EP1949040A1 (en)

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KR20080075108A (en) 2008-08-14
WO2007054519A1 (en) 2007-05-18

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