DE102007045058A1 - Integrated circuit for use in flash memory i.e. NAND-type flash memory, of cellular telephone, has gate stacks coupled to other gate stacks, where each gate stack is provided with control electrode that includes layer - Google Patents
Integrated circuit for use in flash memory i.e. NAND-type flash memory, of cellular telephone, has gate stacks coupled to other gate stacks, where each gate stack is provided with control electrode that includes layer Download PDFInfo
- Publication number
- DE102007045058A1 DE102007045058A1 DE102007045058A DE102007045058A DE102007045058A1 DE 102007045058 A1 DE102007045058 A1 DE 102007045058A1 DE 102007045058 A DE102007045058 A DE 102007045058A DE 102007045058 A DE102007045058 A DE 102007045058A DE 102007045058 A1 DE102007045058 A1 DE 102007045058A1
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- Germany
- Prior art keywords
- devices
- layers
- control electrode
- integrated circuit
- gate stacks
- Prior art date
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Links
- 230000015654 memory Effects 0.000 title claims description 18
- 230000001413 cellular effect Effects 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000003860 storage Methods 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims abstract description 7
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 5
- 239000010937 tungsten Substances 0.000 claims abstract description 5
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 3
- -1 tungsten nitride Chemical class 0.000 claims abstract 2
- 239000000758 substrate Substances 0.000 claims description 10
- 229920005591 polysilicon Polymers 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 229910052715 tantalum Inorganic materials 0.000 abstract description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 46
- 230000002093 peripheral effect Effects 0.000 description 23
- 150000004767 nitrides Chemical class 0.000 description 12
- 210000004027 cell Anatomy 0.000 description 9
- 229910052581 Si3N4 Inorganic materials 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 6
- 238000005530 etching Methods 0.000 description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
- H10B41/42—Simultaneous manufacture of periphery and memory cells
- H10B41/49—Simultaneous manufacture of periphery and memory cells comprising different types of peripheral transistor
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
- H10B43/30—EEPROM devices comprising charge-trapping gate insulators characterised by the memory core region
Abstract
Description
Hintergrund der ErfindungBackground of the invention
Gegenstand der ErfindungSubject of the invention
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer integrierten Schaltung einschließlich verschiedener Typen von Gate Stacks, eine korrespondierende integrierte Schaltungszwischenstruktur und eine entsprechende integrierte Schaltung.The The present invention relates to a process for the preparation of a integrated circuit including various types of Gate stacks, a corresponding integrated circuit interconnect structure and a corresponding integrated circuit.
Beschreibung des Standes der TechnikDescription of the state of technology
Nichtflüchtige Halbleiterspeicher werden heutzutage in einer großen Vielfalt von elektronischen Geräten, wie beispielsweise Mobiltelefonen, Digitalkameras, PDA's (Personal Digital Assistants), tragbaren Computern, nichttragbaren Computern und vielen anderen elektronischen Geräten verwendet.Non-volatile semiconductor memories are going to be in a big size these days Variety of electronic devices, such as mobile phones, digital cameras, PDAs (Personal Digital Assistants), portable computers, non-portable computers and many other electronic devices used.
Elektronisch löschbare und programmierbare Festwertspeicher (EEPROMs) und Flash-Speicher sind die hauptsächlich verwendeten nichtflüchtigen Halbleiterspeicher.electronic erasable and programmable read only memories (EEPROMs) and flash memory the main ones used non-volatile semiconductor memory.
EEPROMs und Flash-Speicher verwenden einen Ladungsspeicherungsbereich, nämlich einen Floating Gate Bereich oder einen Charge Trapping Bereich, der oberhalb und isoliert von einem Kanalbereich in einem Halbleitersubtrat positioniert wird. Ein Control Gate wird über und isoliert von dem Floating Gate bereitgestellt. Das Floating Gate kann Ladungen speichern und kann daher zwischen zwei Zuständen programmiert/gelöscht wer den, das heißt binär "1" und binär "0". In letzter Zeit wurden auch mehrlagige nichtflüchtige Speicherzellen entwickelt.EEPROMs and Flash memories use a charge storage area, namely a floating one Gate area or a batch trapping area, above and positioned isolated from a channel region in a semiconductor substrate becomes. A control gate is over and isolated from the floating gate. The floating Gate can store charges and can therefore be programmed / deleted between two states, this means binary "1" and binary "0". Recently, multilayer nonvolatile memory cells have also been developed.
Als Ladungsspeicher Stacks in nichtflüchtigen Speichern werden heutzutage häufig SONOS-(Silizium-Oxid-Nitrid-Oxid-Silizium) und TANOS-(Tantalnitrid-Aluminiumoxid-Nitrid-Oxid-Silizium) Stacks verwendet. In diesen Stacks dient die Siliziumnitridschicht als Ladungsspeicherungsschicht.When Charge storage Stacks in non-volatile storage are nowadays often SONOS (silicon-oxide-nitride-oxide-silicon) and TANOS (tantalum nitride-alumina-nitride-oxide-silicon) stacks used. In these stacks, the silicon nitride layer serves as Charge storage layer.
In sogenannten NAND Flash Speichern werden NAND Strings aus nichtflüchtigen Speicherzellen in Reihe geschalten. Ein Ende eines solchen NAND Strings wird mit einer gemeinsamen Bitleitung und einer gemeinsamen Sourceleitung durch entsprechende Auswahltransistoren, aufweisend Auswahlgates, die unterschiedlich zu den Ladungsspeicher Gate Stacks der Speicherzellen sind, verbunden.In So-called NAND Flash Saving will be NAND strings from nonvolatile Memory cells connected in series. An end to such a NAND string is provided with a common bit line and a common source line by appropriate selection transistors, comprising selection gates, the different from the charge storage gate stacks of the memory cells are connected.
Mit zunehmender Integration kleiner als 60 nm wird es mehr und mehr eine herausfordernde Aufgabe, einen stabilen Prozeßfluß zu bekommen, wobei die Herstellung der Ladungsspeicher Stacks, der Auswahl Gate Stacks und der peripheren Transistor Gate Stacks einfach in die Herstellungsschritte des Speichers integriert werden können.With Increasing integration smaller than 60 nm will be more and more a challenging task to get a stable process flow, the production of the charge storage stacks, the selection gate Stacks and the peripheral transistor gate stacks easily into the Manufacturing steps of the memory can be integrated.
BESCHREIBUNG DER FIGURENDESCRIPTION OF THE FIGURES
In den Figuren:In the figures:
- a) als einen Querschnitt des Arraybereichs und
- b) als einen Querschnitt des Peripheriebereichs;
- a) as a cross section of the array area and
- b) as a cross-section of the peripheral region;
- a) als einen Querschnitt des Arraybereichs und
- b) als einen Querschnitt des Peripheriebereichs.
- a) as a cross section of the array area and
- b) as a cross section of the peripheral region.
In den Figuren bezeichnen gleiche Bezugszeichen gleichbedeutende oder funktionsgemäß gleichbedeutende Komponenten.In the same reference numerals designate the same or the same functionally equivalent Components.
BESCHREIBUNG DER BEVORZUGTEN AUSFÜHRUNGSFORMENDESCRIPTION OF THE PREFERRED EMBODIMENTS
In
In
dem Prozess-Status von
Sowohl
in dem Arraybereich AR als auch in dem Peripheriebereich PR wurde
eine erste Polysiliziumschicht
Ausgehend
vom Prozess-Status aus
Danach wird die (nicht gezeigte) Blockmaske entfernt, und der Arraybereich AR und der Peripheriebereich werden einer TANGS Stack ausbildenden Schrittsequenz unterworfen.After that the block mask (not shown) is removed, and the array area AR and the peripheral area become a TANGS stack forming step sequence subjected.
Eine
thermische dielektrische Siliziumoxid-Gate-Schicht
Es
sollte erwähnt
werden, dass die dielektrische High-K Schicht
Mit
Ausnahme der thermischen Oxidschicht
Wie
in
Danach
wird der TANGS Stack
In
Bezug auf
Es
sollte erwähnt
werden, dass die Nitrid-Seitenwand-Spacer
Anschließend wird
eine zweite Polysiliziumschicht
Wie
der
Wie
in
Anschließend wird
eine Wolfram-Nitrid/Wolfram-Schicht
Es
sollte erwähnt
werden, dass es, abhängig von
der Höhe
der TANGS Stacks
Wie
in
Auf diese Weise wurden die Grundbestandteile eines NAND-Type Flash-Speichers, Ladungsspeicher Cell Gate Stacks CG1, CG2 Auswahl Gate Stacks SG1, SG2, und periphere Device Stacks PG1, PG2 fertig gestellt.On this way, the basic components of a NAND type flash memory became Charge Storage Cell Gate Stacks CG1, CG2 Selection Gate Stacks SG1, SG2, and peripheral device stacks PG1, PG2 completed.
Der Einfachheit halber und weil es aus dem Stand der Technik bekannt ist, werden die übrigen Prozess-Schritte zur Fertigstellung des NAND Type Flash Speichers dieses Beispiels hier nicht erklärt.Of the For simplicity and because it is known in the art is, the remaining process steps become to complete the NAND Type Flash memory of this example not explained here.
In
der in
Hier
bezeichnet die Schicht
Die übrigen Prozess-Schritte
nach dem in
Obwohl die vorliegende Erfindung mit Bezugnahme auf bevorzugte Ausführungsformen beschrieben wurde, ist sie darauf nicht beschränkt, sondern kann in verschiedenen Art und Weisen, die für einen Fachmann offensichtlich sind, geändert werden. Demnach ist es beabsichtigt, dass die vorliegende Erfindung nur durch den Umfang der hier beigefügten Ansprüche begrenzt ist.Even though the present invention with reference to preferred embodiments is described, it is not limited thereto, but may be in different Ways that for one Professional are obviously changed become. Accordingly, it is intended that the present invention is limited only by the scope of the claims attached hereto.
Insbesondere ist die vorliegende Erfindung nicht beschränkt auf die Materialzusammensetzungen und NAND Stack, auf die in den obigen Ausführungsformen Bezug genommen wurde. Außerdem ist die Erfindung für jede Art von integrierten Schaltungen, die Vorrichtungen mit unterschiedlichen Gate Stacks verwenden, anwendbar. Zum Beispiel kann der Select Gate Stack in dem Arraybereich durch verschiedene andere Verfahren ausgebildet werden.Especially the present invention is not limited to the material compositions and NAND stack referred to in the above embodiments has been. Furthermore is the invention for any type of integrated circuits, the devices with different Use gate stacks, applicable. For example, the Select Gate Stack formed in the array area by various other methods become.
Claims (29)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007045058.5A DE102007045058B4 (en) | 2007-09-20 | 2007-09-20 | A method of fabricating an integrated circuit including various types of gate stacks in first and second regions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007045058.5A DE102007045058B4 (en) | 2007-09-20 | 2007-09-20 | A method of fabricating an integrated circuit including various types of gate stacks in first and second regions |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102007045058A1 true DE102007045058A1 (en) | 2009-04-09 |
DE102007045058B4 DE102007045058B4 (en) | 2015-07-02 |
Family
ID=40417862
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE102007045058.5A Expired - Fee Related DE102007045058B4 (en) | 2007-09-20 | 2007-09-20 | A method of fabricating an integrated circuit including various types of gate stacks in first and second regions |
Country Status (1)
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DE (1) | DE102007045058B4 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020130314A1 (en) * | 2001-03-17 | 2002-09-19 | Samsung Electronics Co., Ltd. | Non-volatile memory device having a metal-oxide-nitride-oxide-semiconductor gate structure and fabrication method thereof |
US20050093047A1 (en) * | 2003-10-02 | 2005-05-05 | Kabushiki Kaisha Toshiba | Semiconductor memory device and method of manufacturing the same |
US20050157549A1 (en) * | 2004-01-21 | 2005-07-21 | Nima Mokhlesi | Non-volatile memory cell using high-k material and inter-gate programming |
US20070096202A1 (en) * | 2005-10-31 | 2007-05-03 | Samsung Electronics Co., Ltd. | Semiconductor device and method for fabricating the same |
US20070207575A1 (en) * | 2006-03-01 | 2007-09-06 | Renesas Technology Corp. | Method of manufacturing a semiconductor device |
-
2007
- 2007-09-20 DE DE102007045058.5A patent/DE102007045058B4/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020130314A1 (en) * | 2001-03-17 | 2002-09-19 | Samsung Electronics Co., Ltd. | Non-volatile memory device having a metal-oxide-nitride-oxide-semiconductor gate structure and fabrication method thereof |
US20050093047A1 (en) * | 2003-10-02 | 2005-05-05 | Kabushiki Kaisha Toshiba | Semiconductor memory device and method of manufacturing the same |
US20050157549A1 (en) * | 2004-01-21 | 2005-07-21 | Nima Mokhlesi | Non-volatile memory cell using high-k material and inter-gate programming |
US20070096202A1 (en) * | 2005-10-31 | 2007-05-03 | Samsung Electronics Co., Ltd. | Semiconductor device and method for fabricating the same |
US20070207575A1 (en) * | 2006-03-01 | 2007-09-06 | Renesas Technology Corp. | Method of manufacturing a semiconductor device |
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Publication number | Publication date |
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DE102007045058B4 (en) | 2015-07-02 |
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