DE102016114799B4 - In-depth STI as a gate dielectric of a high voltage device and manufacturing process - Google Patents
In-depth STI as a gate dielectric of a high voltage device and manufacturing process Download PDFInfo
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- DE102016114799B4 DE102016114799B4 DE102016114799.0A DE102016114799A DE102016114799B4 DE 102016114799 B4 DE102016114799 B4 DE 102016114799B4 DE 102016114799 A DE102016114799 A DE 102016114799A DE 102016114799 B4 DE102016114799 B4 DE 102016114799B4
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- H01L29/1083—Substrate region of field-effect devices of field-effect transistors with insulated gate with an inactive supplementary region, e.g. for preventing punch-through, improving capacity effect or leakage current
Abstract
Verfahren (300) mit den folgenden Schritten:Herstellen eines Trennungsbereichs (36), der in ein Halbleitersubstrat (20) hinein reicht;Ätzen eines oberen Teils des Trennungsbereichs (36), um eine Aussparung (58) in dem Trennungsbereich (36) herzustellen;Herstellen eines Gate-Stapels (160), der in die Aussparung (58) hinein reicht und einen unteren Teil des Trennungsbereichs (36) überlappt; undHerstellen eines Source-Bereichs (170) und eines Drain-Bereichs (170) auf gegenüberliegenden Seiten des Gate-Stapels (160), wobei der Gate-Stapel (160), der Source-Bereich (170) und der Drain-Bereich (170) Teile eines MOS-Bauelements (186) sind, wobei das Verfahren weiterhin die folgenden Schritte aufweist:gleichzeitig mit der Herstellung des Gate-Stapels (160) Herstellen eines weiteren Gate-Stapels (260) für ein weiteres MOS-Bauelement (286), wobei sich der weitere Gate-Stapel (260) direkt über einem nicht ausgesparten Teil des Halbleitersubstrats (20) befindet; undDurchführen einer Planarisierung, um eine Oberseite des Gate-Stapels (160) und eine Oberseite des weiteren Gate-Stapels (260) auf das gleiche Niveau zu bringen.A method (300) comprising the steps of: forming a separation region (36) extending into a semiconductor substrate (20); etching an upper portion of the separation region (36) to produce a recess (58) in the separation region (36); Fabricating a gate stack (160) that extends into the recess (58) and overlaps a lower portion of the separation region (36); and fabricating a source region (170) and a drain region (170) on opposite sides of the gate stack (160), wherein the gate stack (160), the source region (170) and the drain region (170) ) Are parts of a MOS component (186), the method further comprising the following steps: simultaneously with the production of the gate stack (160) production of a further gate stack (260) for a further MOS component (286), wherein the further gate stack (260) is located directly over an un-recessed part of the semiconductor substrate (20); andperforming a planarization in order to bring a top side of the gate stack (160) and a top side of the further gate stack (260) to the same level.
Description
Hintergrund der ErfindungBackground of the invention
HVMOS-Bauelemente (HVMOS: high-voltage metal-oxide semiconductor; Hochspannungs-Metall-Oxid-Halbleiter) werden häufig in elektrischen Vorrichtungen verwendet, wie etwa in Netzteilen für zentrale Verarbeitungseinheiten (CPUs), Wechselstrom/Gleichstrom (AC/DC)-Stromrichtern usw.HVMOS (high-voltage metal-oxide semiconductor) devices are widely used in electrical devices such as power supplies for central processing units (CPUs), alternating current / direct current (AC / DC) converters etc.
HVMOS-Bauelemente haben andere Strukturen als MVMOS-Bauelemente (MVMOS: medium-voltage metal-oxide semiconductor; Mittelspannungs-Metall-Oxid-Halbleiter-Bauelemente) und LVMOS-Bauelemente (LVMOS: low-voltage metal-oxide semiconductor; Niederspannungs-Metall-Oxid-Halbleiter-Bauelemente). Um hohe Spannungen, die zwischen dem Gate und dem Drain eines HVMOS-Bauelements angelegt werden, aufrechtzuerhalten, ist das Gate-Dielektrikum des HVMOS-Bauelements dicker als das Gate-Dielektrikum eines MVMOS-Bauelements und als das Gate-Dielektrikum eines LVMOS-Bauelements. Darüber hinaus sind die Dotierungskonzentrationen in Hochspannungs-Wannenbereichen niedriger als die in den Wannenbereichen von MVMOS-Bauelementen und LVMOS-Bauelementen, um eine höhere Gate-Drain-Spannung aufrechtzuerhalten.
Aus der US 2014 / 0 117 444 A1 ist ein HVMOS-Bauelement bekannt, das eine Vielzahl von Isolationsbereichen in einem Substrat aufweist, wobei die Oberfläche eines Isolationsbereichs unter der Oberfläche des Substrats liegt. Eine erste Gateelektrode ist auf diesem Isolationsbereich angeordnet und eine zweite Gateelektrode auf der Oberfläche des Substrats. Die US 2010 / 0 264 481 A1 beschreibt eine Speichervorrichtung mit einem Hochspannungsbereich, in dem eine Gatestruktur in einer Aussparung in einer Isolationsstruktur angeordnet ist.HVMOS components have different structures than MVMOS components (MVMOS: medium-voltage metal-oxide semiconductor; medium-voltage metal-oxide semiconductor components) and LVMOS components (LVMOS: low-voltage metal-oxide semiconductor; low-voltage metal Oxide semiconductor components). To maintain high voltages applied between the gate and drain of an HVMOS device, the gate dielectric of the HVMOS device is thicker than the gate dielectric of an MVMOS device and than the gate dielectric of an LVMOS device. In addition, the doping concentrations in high voltage well regions are lower than those in the well regions of MVMOS devices and LVMOS devices in order to maintain a higher gate-drain voltage.
From US 2014/0 117 444 A1 an HVMOS component is known which has a multiplicity of isolation areas in a substrate, the surface of an isolation area being below the surface of the substrate. A first gate electrode is arranged on this insulation region and a second gate electrode is arranged on the surface of the substrate. US 2010/0 264 481 A1 describes a memory device with a high-voltage area in which a gate structure is arranged in a cutout in an insulation structure.
FigurenlisteFigure list
Aspekte der vorliegenden Erfindung lassen sich am besten anhand der nachstehenden detaillierten Beschreibung in Verbindung mit den beigefügten Zeichnungen verstehen. Es ist zu beachten, dass entsprechend der üblichen Praxis in der Branche verschiedene Elemente nicht maßstabsgetreu gezeichnet sind. Vielmehr können der Übersichtlichkeit der Erörterung halber die Abmessungen der verschiedenen Elemente beliebig vergrößert oder verkleinert sein.
- Die
1 bis18 zeigen Schnittansichten von Zwischenstufen bei der Herstellung eines n-HVMOS-Bauelements und eines n-MVMOS-Bauelements (oder eines n-LVMOS-Bauelements) gemäß einigen Ausführungsformen. -
19 zeigt eine Draufsicht eines n-HVMOS-Bauelements gemäß einigen Ausführungsformen. -
20 zeigt eine Schnittansicht eines p-HVMOS-Bauelements und eines p-MV/LVMOS-Bauelements gemäß einigen Ausführungsformen. -
21 zeigt einen Prozessablauf für die Herstellung eines HVMOS-Bauelements und eines MV/LV-MOS-Bauelements gemäß einigen Ausführungsformen.
- The
1 to18th 13 show cross-sectional views of intermediate stages in the manufacture of an n-HVMOS device and an n-MVMOS device (or an n-LVMOS device) in accordance with some embodiments. -
19th FIG. 10 shows a top view of an n-HVMOS device in accordance with some embodiments. -
20th FIG. 11 shows a cross-sectional view of a p-HVMOS device and a p-MV / LVMOS device in accordance with some embodiments. -
21st FIG. 10 shows a process flow for manufacturing an HVMOS device and an MV / LV MOS device in accordance with some embodiments.
Detaillierte BeschreibungDetailed description
Die Erfindung betrifft Verfahren zur Herstellung eines MOS-Bauelements mit den Merkmalen des Anspruchs 1 bzw. 8 sowie eine integrierte Schaltungsstruktur mit den Merkmalen des Anspruchs 14. Beispielshafte Ausführungsformen sind in den abhängigen Ansprüchen angegeben.
Die nachstehende Beschreibung stellt viele verschiedene Ausführungsformen oder Beispiele zum Implementieren verschiedener Merkmale der Erfindung bereit. Nachstehend werden spezielle Beispiele für Komponenten und Anordnungen beschrieben, um die vorliegende Erfindung zu vereinfachen. Zum Beispiel kann die Herstellung eines ersten Elements über oder auf einem zweiten Element in der nachstehenden Beschreibung Ausführungsformen umfassen, bei denen das erste und das zweite Element in direktem Kontakt ausgebildet werden, und sie kann auch Ausführungsformen umfassen, bei denen zusätzliche Elemente zwischen dem ersten und dem zweiten Element so ausgebildet werden können, dass das erste und das zweite Element nicht in direktem Kontakt sind. Darüber hinaus können in der vorliegenden Erfindung Bezugszahlen und/oder -buchstaben in den verschiedenen Beispielen wiederholt werden. Diese Wiederholung dient der Einfachheit und Übersichtlichkeit und schreibt an sich keine Beziehung zwischen den verschiedenen erörterten Ausführungsformen und/oder Konfigurationen vor.The invention relates to a method for producing a MOS component with the features of
The description below provides many different embodiments or examples for implementing various features of the invention. Specific examples of components and arrangements are described below in order to simplify the present invention. For example, making a first element over or on a second element in the description below may include embodiments in which the first and second elements are formed in direct contact, and may also include embodiments in which additional elements are placed between the first and second elements the second element can be formed so that the first and the second element are not in direct contact. Furthermore, in the present invention, reference numbers and / or letters may be repeated in the various examples. This repetition is for the sake of simplicity and clarity and does not per se prescribe a relationship between the various embodiments and / or configurations discussed.
Darüber hinaus können hier räumlich relative Begriffe, wie etwa „darunter befindlich“, „unter“, „untere(r)“/„unteres“, „darüber befindlich“, „obere(r)“/„oberes“ und dergleichen, zur einfachen Beschreibung der Beziehung eines Elements oder einer Struktur zu einem oder mehreren anderen Elementen oder Strukturen verwendet werden, die in den Figuren dargestellt sind. Die räumlich relativen Begriffe sollen zusätzlich zu der in den Figuren dargestellten Orientierung andere Orientierungen des in Gebrauch oder in Betrieb befindlichen Bauelements umfassen. Die Vorrichtung kann anders ausgerichtet werden (um 90 Grad gedreht oder in einer anderen Orientierung), und die räumlich relativen Deskriptoren, die hier verwendet werden, können ebenso entsprechend interpretiert werden.In addition, spatially relative terms such as "below", "below", "lower" / "lower", "above", "upper" / "upper" and the like can be used for simplicity Description of the relationship of an element or structure to one or more other elements or structures shown in the figures. The spatially relative terms are intended to include other orientations of the component that is in use or in operation in addition to the orientation shown in the figures. The device can be oriented differently (rotated 90 degrees or in a different orientation) and the spatially relative descriptors used herein can also be interpreted accordingly.
Gemäß verschiedenen beispielhaften Ausführungsformen werden ein HVMOS-Bauelement und ein Verfahren zu seiner Herstellung zur Verfügung gestellt. Die Zwischenstufen bei der Herstellung des HVMOS-Bauelements werden ebenfalls beschrieben. In allen Darstellungen und erläuternden Ausführungsformen werden ähnliche Bezugssymbole zum Bezeichnen von ähnlichen Elementen verwendet.According to various exemplary embodiments, an HVMOS component and a method for its production are provided. The intermediate stages in the manufacture of the HVMOS device are also described. Similar reference symbols are used throughout the drawings and illustrative embodiments to refer to similar elements.
Die
Das Halbleitersubstrat
Die
Kommen wir nun zu
Wie nun in
Nach der Herstellung des Oxidbelags werden die verbliebenen Teile der Gräben
Dann wird ein Dampfglühprozess durchgeführt. Der Dampfglühprozess kann das Glühen der in
Anschließend wird eine Planarisierung, wie etwa chemisch-mechanisches Polieren (CMP) durchgeführt, um überschüssige Teile des dielektrischen Materials
In nachfolgenden Schritten werden die Maskenschicht
Die
Dann wird, wie in
Dann wird, wie in
In einem nachfolgenden Schritt, der in
Kommen wir nun zu
Der verbleibende untere Teil 36B des STI-Bereichs
Kommen wir nun zu
Abstandshalter
Kommen wir nun zu
Darüber hinaus werden Aufnahmebereiche
Kommen wir nun zu
Die Gate-Dielektrika
Bei den Ausführungsformen, die in den
Kommen wir nun zu
Das MOS-Bauelement
Die Ausführungsformen der vorliegenden Erfindung haben mehrere Vorzüge. Es ist wünschenswert, dass die HVMOS-Bauelemente und die LV/MV-MOS-Bauelemente die Prozesse zur Herstellung der Ersatz-Gates gemeinsam verwenden, um die Herstellungskosten zu senken. Die HVMOS-Bauelemente haben jedoch dicke Gate-Dielektrika, und daher können sich die Oberseiten der Gate-Dielektrika der HVMOS-Bauelemente im Wesentlichen auf dem gleichen Niveau wie die Oberseiten der Blind-Gate-Elektroden der LV/MV-MOS-Bauelemente oder sogar darüber befinden. Dadurch kann die Planarisierung zum Freilegen der Blind-Gate-Elektroden der LV/MV-MOS-Bauelemente zu einer vollständigen Entfernung der Blind-Gate-Elektroden der HVMOS-Bauelemente führen. Das heißt, die Ersatz-Gates für die HVMOS-Bauelemente können nicht durch gemeinsames Verwenden des gleichen Prozesses wie für die Herstellung der Ersatz-Gates für die LV/MV-MOS-Bauelemente hergestellt werden. Durch Aussparen von STI-Bereichen und Herstellen der Gate-Elektroden der HVMOS-Bauelemente in den Aussparungen wird der Höhenunterschied zwischen den Oberseiten der HVMOS-Bauelemente und der LV/MV-MOS-Bauelemente verringert, und die Planarisierung kann durchgeführt werden, ohne dass es zu einer vollständigen Entfernung der Blind-Gate-Elektroden der HVMOS-Bauelemente kommt. Darüber hinaus werden bei einigen Ausführungsformen der vorliegenden Erfindung die STI-Bereiche als die Gate-Dielektrika der HVMOS-Bauelemente verwendet, und dadurch können die Herstellungskosten gesenkt werden.The embodiments of the present invention have several advantages. It is desirable that the HVMOS devices and the LV / MV MOS devices share the processes for manufacturing the replacement gates in order to reduce the manufacturing cost. However, the HVMOS devices have thick gate dielectrics and therefore the tops of the gate dielectrics of the HVMOS devices may or even be substantially at the same level as the tops of the dummy gate electrodes of the LV / MV MOS devices are about it. As a result, the planarization to expose the dummy gate electrodes of the LV / MV MOS components can lead to a complete removal of the dummy gate electrodes of the HVMOS components. That is, the replacement gates for the HVMOS devices cannot be manufactured by using the same process together as for the manufacture of the replacement gates for the LV / MV MOS devices. By cutting out STI areas and fabricating the gate electrodes of the HVMOS devices in the cutouts, the height difference between the tops of the HVMOS devices and the LV / MV MOS devices is reduced, and planarization can be performed without it the blind gate electrodes of the HVMOS components are completely removed. In addition, in some embodiments of the present invention, the STI regions are used as the gate dielectrics of the HVMOS devices, and this can reduce manufacturing costs.
Bei einigen Ausführungsformen der vorliegenden Erfindung weist ein Verfahren die folgenden Schritte auf: Herstellen eines Trennungsbereichs oder Isolationsbereichs, der in ein Halbleitersubstrat hinein reicht; Ätzen eines oberen Teils des Trennungsbereichs, um eine Aussparung in dem Trennungsbereich herzustellen; und Herstellen eines Gate-Stapels, der in die Aussparung hinein reicht und einen unteren Teil des Trennungsbereichs überlappt. Auf gegenüberliegenden Seiten des Gate-Stapels werden ein Source-Bereich und ein Drain-Bereich hergestellt. Der Gate-Stapel, der Source-Bereich und der Drain-Bereich sind Teile eines MOS-Bauelements. Das Verfahren weist weiterhin die folgenden Schritte auf: gleichzeitig mit der Herstellung des Gate-Stapels Herstellen eines weiteren Gate-Stapels für ein weiteres MOS-Bauelement, wobei sich der weitere Gate-Stapel direkt über einem nicht ausgesparten Teil des Halbleitersubstrats befindet; und Durchführen einer Planarisierung, um eine Oberseite des Gate-Stapels und eine Oberseite des weiteren Gate-Stapels auf das gleiche Niveau zu bringen.In some embodiments of the present invention, a method comprises the following steps: producing a separation region or isolation region that extends into a semiconductor substrate; Etching a top portion of the separation area to create a recess in the separation area; and fabricating a gate stack that extends into the recess and overlaps a lower portion of the separation area. A source region and a drain region are produced on opposite sides of the gate stack. The gate stack, the source region and the drain region are parts of a MOS component. The method further comprises the following steps: simultaneously with the production of the gate stack, production of a further gate stack for a further MOS component, the further gate stack being located directly above a non-recessed part of the semiconductor substrate; and performing a planarization in order to bring a top side of the gate stack and a top side of the further gate stack to the same level.
Bei einigen Ausführungsformen der vorliegenden Erfindung weist ein Verfahren die folgenden Schritte auf: Herstellen eines ersten und eines zweiten STI-Bereichs, die von einer Oberseite eines Halbleitersubstrats her in das Halbleitersubstrat hinein reichen; und Ätzen des ersten STI-Bereichs, um eine Aussparung herzustellen, die von einer Oberseite des ersten STI-Bereichs her in den ersten STI-Bereich hinein reicht. Der erste STI-Bereich weist einen unteren Teil auf, der sich unter der Aussparung befindet. Das Verfahren weist weiterhin die folgenden Schritte auf: Herstellen eines ersten Gate-Stapels, der den unteren Teil des ersten STI-Bereichs überlappt; Herstellen eines zweiten Gate-Stapels über und in Kontakt mit einer Oberseite des Halbleitersubstrats; Herstellen von ersten Source-/Drain-Bereichen auf gegenüberliegenden Seiten des ersten Gate-Stapels; und Herstellen von zweiten Source-/Drain-Bereichen auf gegenüberliegenden Seiten des zweiten Gate-Stapels. Einer der zweiten Source-/Drain-Bereiche kommt in Kontakt mit einer Seitenwand des zweiten STI-Bereichs. Ein ILD wird über den ersten Source-/Drain-Bereichen und den zweiten Source-/Drain-Bereichen hergestellt. Eine Planarisierung wird durchgeführt, um eine Oberseite des ersten Gate-Stapels koplanar mit einer Oberseite des zweiten Gate-Stapels zu machen.In some embodiments of the present invention, a method has the following steps: producing a first and a second STI region that extend into the semiconductor substrate from a top side of a semiconductor substrate; and etching the first STI area to create a recess that extends into the first STI area from a top of the first STI area. The first STI area has a lower portion that is located under the recess. The method further comprises the following steps: forming a first gate stack that overlaps the lower part of the first STI area; Forming a second gate stack over and in contact with a top surface of the semiconductor substrate; Forming first source / drain regions on opposite sides of the first gate stack; and forming second source / drain regions on opposite sides of the second gate stack. One of the second source / drain regions comes into contact with a sidewall of the second STI region. An ILD is fabricated over the first source / drain regions and the second source / drain regions. Planarization is performed to make a top of the first gate stack coplanar with a top of the second gate stack.
Bei einigen Ausführungsformen der vorliegenden Erfindung weist eine integrierte Schaltungsstruktur ein Halbleitersubstrat auf. Ein HVMOS-Bauelement weist ein Gate-Dielektrikum auf, das einen Teil hat, der niedriger als eine Oberseite des Halbleitersubstrats ist. Eine Gate-Elektrode befindet sich über dem Gate-Dielektrikum, wobei die Gate-Elektrode einen Teil hat, der niedriger als die Oberseite des Halbleitersubstrats ist. Auf gegenüberliegenden Seiten des Gate-Dielektrikums befinden sich ein Source-Bereich und ein Drain-Bereich. Die integrierte Schaltungsstruktur weist außerdem ein weiteres MOS-Bauelement auf, wobei das weitere MOS-Bauelement ein weiteres Gate-Dielektrikum aufweist, das höher als die Oberseite des Halbleitersubstrats ist. Das Gate-Dielektrikum weist weiterhin einen vierten Teil auf, der aus dem gleichen Material wie das weitere Gate-Dielektrikum besteht. Der vierte Teil weist einen horizontalen Teil auf, der in Kontakt mit dem ersten Teil des Gate-Dielektrikums ist, und vertikale Teile, die mit gegenüberliegenden Enden des horizontalen Teils verbunden sindIn some embodiments of the present invention, an integrated circuit structure includes a semiconductor substrate. An HVMOS device has a gate dielectric that has a portion that is lower than a top surface of the semiconductor substrate. A gate electrode is located over the gate dielectric, the gate electrode having a portion that is lower than the top of the semiconductor substrate. A source region and a drain region are located on opposite sides of the gate dielectric. The integrated circuit structure also has a further MOS component, the further MOS component having a further gate dielectric which is higher than the top side of the semiconductor substrate. The gate dielectric furthermore has a fourth part which consists of the same material as the further gate dielectric. The fourth part has a horizontal part which is in contact with the first part of the gate dielectric and vertical parts which are connected to opposite ends of the horizontal part
Vorstehend sind Merkmale verschiedener Ausführungsformen beschrieben worden, sodass Fachleute die Aspekte der vorliegenden Erfindung besser verstehen können. Fachleuten dürfte klar sein, dass sie die vorliegende Erfindung ohne Weiteres als eine Grundlage zum Gestalten oder Modifizieren anderer Verfahren und Strukturen zum Erreichen der gleichen Ziele und/oder zum Erzielen der gleichen Vorzüge wie bei den hier vorgestellten Ausführungsformen verwenden können.Features of various embodiments have been described above so that those skilled in the art may better understand aspects of the present invention. Those skilled in the art will understand that they can readily use the present invention as a basis for designing or modifying other methods and structures to achieve the same goals and / or achieve the same benefits as the embodiments presented herein.
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US20100264481A1 (en) * | 2005-04-12 | 2010-10-21 | Yoo-Cheol Shin | Nonvolatile Memory Devices and Related Methods |
US20140117444A1 (en) * | 2012-11-01 | 2014-05-01 | Taiwan Semiconductor Manufacturing Company, Ltd. | Lateral MOSFET |
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US20100264481A1 (en) * | 2005-04-12 | 2010-10-21 | Yoo-Cheol Shin | Nonvolatile Memory Devices and Related Methods |
US20140117444A1 (en) * | 2012-11-01 | 2014-05-01 | Taiwan Semiconductor Manufacturing Company, Ltd. | Lateral MOSFET |
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