DE102010028121A1 - Method for manufacturing e.g. application-specific integrated switching circuit, involves removing connector of plastic mass and chips from carrier by thermal decomposition of thermoplastic material at temperature - Google Patents
Method for manufacturing e.g. application-specific integrated switching circuit, involves removing connector of plastic mass and chips from carrier by thermal decomposition of thermoplastic material at temperature Download PDFInfo
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- DE102010028121A1 DE102010028121A1 DE201010028121 DE102010028121A DE102010028121A1 DE 102010028121 A1 DE102010028121 A1 DE 102010028121A1 DE 201010028121 DE201010028121 DE 201010028121 DE 102010028121 A DE102010028121 A DE 102010028121A DE 102010028121 A1 DE102010028121 A1 DE 102010028121A1
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- thermoplastic material
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- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
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Abstract
Description
Stand der TechnikState of the art
Die vorliegende Erfindung betrifft ein Verfahren zum Herstellen von Halbleiter-Bauelementen, ein durch ein solches Verfahren erhältliches Halbleiter-Bauelement und einen als Zwischenprodukt des Verfahrens erhältlichen Verbund mit eingebetteten Halbleiterchips.The present invention relates to a method of manufacturing semiconductor devices, a semiconductor device obtainable by such a method, and an embedded semiconductor chip package obtainable as an intermediate of the method.
In der Aufbau- und Verbindungstechnik von Halbleiter-Bauelementen werden zunehmend neue substratlose Gehäuseformen verwendet. Eine Variante dabei ist das sogenannte ”Embedded Wafer Level Package” (eWLP). Diese Variante verwendet für einen Bestückung und Molden umfassenden Packageprozess ein Trägersubstrat, welches als temporärer Träger für die aufgesetzten und eingebetteten Halbleiterchips dient und nach dem Einbetten der Halbleiterchips in eine Kunststoffmasse vom so gebildeten scheibenförmigen Mold-Chip-Verbund auch ”Reconstituted Wafer” oder Moldwafer genannt, wieder gelöst wird. Dabei werden zuerst Halbleiterchips in einem ”Pick And Place”-Prozess mit ihrer aktiven Oberfläche, wie u. a. Padflächen für die elektrische Kontaktierung, nach unten (face-down) auf den temporären Träger bestückt und anschließend mit einer Moldmasse aus Kunststoff, beispielsweise Epoxidharz, übermoldet. Zwischen dem Moldwafer und dem Träger eingebrachte Folien oder Beschichtungen ermöglichen ein Ablösen des neu geschaffenen Moldwafers vom temporären Träger. Die Adhäsionskräfte der Folien beziehungsweise Beschichtungen zum Moldwafer und/oder zum Träger können über Temperaturprozesse und/oder mechanische Belastung vermindert und der temporäre Verbund zwischen Moldwafer und Träger somit gelöst werden. Im einfachsten Fall handelt es sich bei dieser Bondbeschichtung, um beidseitig klebende Bondtapes.In the construction and connection technology of semiconductor devices, new substrateless housing shapes are increasingly being used. One variant is the so-called "Embedded Wafer Level Package" (eWLP). This variant uses for packaging and Molden comprehensive package process a carrier substrate, which serves as a temporary support for the mounted and embedded semiconductor chips and after embedding the semiconductor chips in a plastic mass from the disk-shaped mold-chip composite thus formed also called "reconstituted wafer" or Moldwafer , will be solved again. In this case, first semiconductor chips in a "pick and place" process with their active surface, such as. a. Pad surfaces for the electrical contact, fitted down (face-down) on the temporary support and then overmolded with a molding compound made of plastic, such as epoxy resin. Between the mold wafer and the carrier introduced films or coatings allow detachment of the newly created mold wafer from the temporary carrier. The adhesion forces of the films or coatings to the mold wafer and / or to the support can be reduced by means of temperature processes and / or mechanical stress and the temporary bond between mold wafer and carrier can thus be achieved. In the simplest case, this bond coating is double-sided adhesive bond tape.
Eine weitere Bondbeschichtung ist in der
Offenbarung der ErfindungDisclosure of the invention
Das erfindungsgemäße Verfahren zum Herstellen von Halbleiter-Bauelementen nach Anspruch 1, das durch ein solches Verfahren erhältliche Halbleiter-Bauelement nach Anspruch 11 sowie der Verbund gemäß Anspruch 12 weisen gegenüber bekannten Lösungsansätzen die Vorteile auf, dass ein sowohl kostengünstiger als auch spannungs- und kontaminationsarmer Aufbau ermöglicht wird.The inventive method for producing semiconductor devices according to claim 1, the semiconductor device obtainable by such a method according to claim 11 and the composite according to
Der Erfindung liegt die Erkenntnis zu Grunde, dass bei Verwendung eines thermoplastischen Materials für die Bondbeschichtung zwischen temporärem Träger und Moldwafer, wobei das thermoplastische Material die Eigenschaft hat, dass es bei einer im Moldprozess, bei dem Halbleiterchips in die Kunststoffmasse eingebettet werden, verwendeten Temperatur zur Erweichung und bei einer Temperatur, die über der im Moldprozess verwendeten Temperatur liegt, zur Zersetzung neigt, diese Erweichung in der Phase der Aushärtung der Moldmasse zu einer mechanischen Entkopplung der Moldmasse vom Träger führt, wodurch eine spannungsarme und verwölbungsfreie Aushärtung der Moldmasse ermöglicht wird. Vorzugsweise findet die Erweichung des thermoplastischen Materials nach erfolgtem Moldflussende statt. Entkopplung bedeutet in diesem Fall, dass die Verbundpartner des asymmetrischen Verbundes bestehend aus Träger und Moldwafer einander durch die erweichte Zwischenschicht bestehend aus dem thermoplastischen Material nicht oder nur vermindert wahrnehmen, der Verbund aber erhalten bleibt und weder eine Ablösung noch eine Zersetzung stattfindet. Eine Zersetzung des thermoplastischen Materials, die zum Ablösen des Trägers vom Moldwafer führt, findet bei einer höheren Temperatur als der beim Molden verwendeten Moldtemperatur statt. Dadurch ist das Verfahren gut reproduzierbar. Auch wird eine Kontamination einer zum Einbetten der Halbleiterchips verwendeten Moldanlage vermieden. Das Ablösen des Trägers durch Zersetzung des thermoplastischen Materials kann außerhalb der Moldanlage in einem abgesaugten, beziehungsweise stickstoff- oder sauerstoffgefluteten Ofen erfolgen. Vorzugsweise wird der Zersetzungsschritt prozesskonform innerhalb eines für die Endvernetzung der Moldmasse notwendigen ”Post Mold Cure”-Schrittes durchgeführt.The invention is based on the finding that, when using a thermoplastic material for the bond coating between temporary carrier and mold wafer, wherein the thermoplastic material has the property that it is used in a temperature used in the molding process in which semiconductor chips are embedded in the plastics material Softening and at a temperature which is higher than the temperature used in the molding process, tends to decomposition, this softening in the curing phase of the molding compound leads to a mechanical decoupling of the molding compound from the support, whereby a low-stress and warp-free curing of the molding compound is made possible. Preferably, the softening of the thermoplastic material takes place after the Moldflussende. In this case, decoupling means that the composite partners of the asymmetric composite consisting of carrier and mold wafer do not perceive or only diminish each other through the softened intermediate layer consisting of the thermoplastic material, but the composite is retained and neither detachment nor decomposition takes place. A decomposition of the thermoplastic material, which leads to the detachment of the carrier from the mold wafer, takes place at a higher temperature than the molding temperature used in the molding process. This makes the process easy to reproduce. Also, contamination of a mold used for embedding the semiconductor chips is avoided. The detachment of the carrier by decomposition of the thermoplastic material can be done outside of the mold in a suctioned, or nitrogen or oxygen-flooded oven. Preferably, the decomposition step is in accordance with the process within one for the final crosslinking of Mold mass necessary "Post Mold Cure" step performed.
Dadurch, dass die Herstellung des spannungsarmen und verwölbungsfreien Moldwafers nicht auf der Zersetzung eines Materials in der Moldanlage, sondern auf Entkopplung der Verbundpartner durch Erweichung basiert, wird zum Einen eine Kontamination der Moldanlage mit, möglicherweise giftigen und brandfördernden Substanzen, wie Aciden und Peroxiden, und anderereseits die Entstehung von Poren oder Einschlüssen in der Oberfläche der Kunststoffmasse des Moldwafers, die durch Ausgasung von Zersetzungsprodukten in die noch nicht vollständig ausgehärtete Moldmasse verursacht wird, vermieden. Dadurch wird die Weiterprozessierung erleichtert und die Zuverlässigkeit der so hergestellten Bauelemente erhöht. Außerdem wird sichergestellt, dass die Halbleiterchips bis zum Ende des Moldflusses im Moldprozess positionsstabil fixiert sind, da während des Moldprozesses keine Zersetzung des thermoplastischen Materials stattfindet.The fact that the production of low-stress and warp-free Moldwafer is not based on the decomposition of a material in the Moldanlage, but on decoupling of the composite partners by softening, on the one hand, contamination of the mold with potentially toxic and oxidizing substances such as acids and peroxides, and On the other hand, the formation of pores or inclusions in the surface of the plastic mass of the Moldwafer, which is caused by outgassing of decomposition products in the not yet fully cured molding compound, avoided. This facilitates further processing and increases the reliability of the components produced in this way. In addition, it is ensured that the semiconductor chips are fixed in a positionally stable manner until the end of the mold flow in the molding process, since no decomposition of the thermoplastic material takes place during the molding process.
Bei dem als temporäre Bondbeschichtung verwendeten thermoplastischen Material handelt es sich insbesondere um thermoplastischen Polymerlack. Dieser kann durch Aufschleudern und Ausbacken auf den Träger aufgebracht werden, wobei die Lackdicke über die Viskosität und Schleuderparameter einstellbar ist. Dadurch können die Herstellungskosten verhältnismäßig gering gehalten werden. Außerdem ist Polymerlack sehr einfach litographisch strukturierbar. Eine Variation der Bondtiefe und somit Topographien, beispielsweise Überstände der Halbleiterchips über die geschaffene Moldoberfläche des scheibenförmigen Verbundes, sind leicht durch Bestückung in die Tiefe des thermoplastischen Materials realisierbar, da nicht die Einschränkung besteht, eine bestimmte Materialebene nicht durchdringen zu dürfen. Die Zersetzung des thermoplastischen Materials zum Ablösen des temporären Trägers findet im gesamten Volumen des thermoplastischen Materials statt.The thermoplastic material used as a temporary bond coating is, in particular, thermoplastic polymer paint. This can be applied by spin-coating and baking on the carrier, wherein the paint thickness on the viscosity and spin parameters is adjustable. As a result, the manufacturing cost can be kept relatively low. In addition, polymer paint is very easy structurable lithographically. A variation of the bond depth and thus topographies, for example supernatants of the semiconductor chips over the created mold surface of the disk-shaped composite, can easily be realized by placement in the depth of the thermoplastic material, since there is no restriction that it should not be allowed to penetrate a certain material plane. The decomposition of the thermoplastic material to release the temporary carrier takes place throughout the volume of the thermoplastic material.
Das Erweichen des thermoplastischen Materials erfolgt zeit- und temperaturabhängig, vorzugsweise ab einer Temperatur von 100°C aufwärts. Die Zersetzungstemperatur des thermoplastischen Materials liegt vorzugsweise zwischen 200°C und 260°C. Bei einer besonders bevorzugten Ausführungsform der Erfindung wird der Moldprozess bei einer Temperatur zwischen 120°C und 180°C für zwei bis vier Minuten durchgeführt, wohingegen der nächste Prozessschritt, währenddessen eine Zersetzung des thermoplastischen Materials erfolgt, für zwei bis acht Stunden bei einer Temperatur von 180°C bis 240°C, besonders bevorzugt zwischen 180°C bis 220°C durchgeführt wird.The softening of the thermoplastic material is time and temperature-dependent, preferably from a temperature of 100 ° C upwards. The decomposition temperature of the thermoplastic material is preferably between 200 ° C and 260 ° C. In a particularly preferred embodiment of the invention, the molding process is carried out at a temperature between 120 ° C and 180 ° C for two to four minutes, whereas the next process step, during which a decomposition of the thermoplastic material takes place, for two to eight hours at a temperature of 180 ° C to 240 ° C, more preferably between 180 ° C to 220 ° C is performed.
Zeichnungendrawings
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert.Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description.
Es zeigen:Show it:
Beschreibung der AusführungsbeispieleDescription of the embodiments
In den Figuren bezeichnen gleiche Bezugszeichen gleiche oder funktionsgleiche Komponenten.In the figures, the same reference numerals designate the same or functionally identical components.
Gemäß den bevorzugten Ausführungsbeispielen der Erfindung wird zuerst ein scheibenförmiger Träger
Das Aufbringen des thermoplastischen Polymerlackes
Gemäß dem ersten Ausführungsbeispiel des erfindungsgemäßen Verfahrens werden Halbleiterchips
Gemäß einem zweiten Ausführungsbeispiel der Erfindung werden vor der Bestückung mit Halbleiterchips
Nach der Bestückung mit den Halbleiterchips
Nach dem Aushärten der Moldmasse
Gemäß dem dritten Ausführungsbeispiel der Erfindung werden, wie in
Bei dem Chip
Wie in
Obwohl die vorliegende Erfindung vorstehend anhand bevorzugter Ausführungsbeispiele erläutert worden ist, ist sie nicht darauf beschränkt, sondern auch in anderer Weise ausführbar.Although the present invention has been explained above with reference to preferred embodiments, it is not limited thereto, but also executable in other ways.
Das erfindungsgemäße Verfahren kann zur Herstellung substratloser Sensor-Moldpackages, unter anderem für Druck-, Beschleunigungs- und Drehratensensoren eingesetzt werden. Allerdings ist die Erfindung nicht auf Sensorchips beschränkt, sondern prinzipiell auf beliebige Halbleiterchips anwendbar.The method according to the invention can be used for producing substrateless sensor mold packages, inter alia for pressure, acceleration and rotation rate sensors. However, the invention is not limited to sensor chips, but in principle applicable to any semiconductor chips.
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 102005041539 B4 [0003] DE 102005041539 B4 [0003]
Claims (12)
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DE201010028121 DE102010028121A1 (en) | 2010-04-22 | 2010-04-22 | Method for manufacturing e.g. application-specific integrated switching circuit, involves removing connector of plastic mass and chips from carrier by thermal decomposition of thermoplastic material at temperature |
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DE102005041539B4 (en) | 2005-08-31 | 2008-04-10 | Infineon Technologies Ag | Process for producing a disc-shaped and / or plate-shaped composite body |
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DE102005041539B4 (en) | 2005-08-31 | 2008-04-10 | Infineon Technologies Ag | Process for producing a disc-shaped and / or plate-shaped composite body |
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