WO2005101508A1 - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
- Publication number
- WO2005101508A1 WO2005101508A1 PCT/JP2004/004824 JP2004004824W WO2005101508A1 WO 2005101508 A1 WO2005101508 A1 WO 2005101508A1 JP 2004004824 W JP2004004824 W JP 2004004824W WO 2005101508 A1 WO2005101508 A1 WO 2005101508A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- semiconductor device
- ferroelectric capacitor
- insulating film
- forming
- Prior art date
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims abstract description 40
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 230000001681 protective effect Effects 0.000 claims abstract description 7
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract 3
- 239000011229 interlayer Substances 0.000 claims description 26
- 239000010410 layer Substances 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 2
- 238000009832 plasma treatment Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- ZHPNWZCWUUJAJC-UHFFFAOYSA-N fluorosilicon Chemical compound [Si]F ZHPNWZCWUUJAJC-UHFFFAOYSA-N 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 9
- 229910004014 SiF4 Inorganic materials 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 abstract 1
- 239000010408 film Substances 0.000 description 92
- 230000015654 memory Effects 0.000 description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 229910052814 silicon oxide Inorganic materials 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000000137 annealing Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000004544 sputter deposition Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 3
- 238000000059 patterning Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013039 cover film Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229940104869 fluorosilicate Drugs 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
Classifications
-
- H01L28/57—
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B53/00—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B53/00—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors
- H10B53/30—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors characterised by the memory core region
Definitions
- the present invention relates to a semiconductor device suitable for a nonvolatile memory including a ferroelectric capacitor and a method for manufacturing the same.
- a ferroelectric memory including a ferroelectric capacitor having a planar structure is being manufactured.
- the demand for higher integration demands a smaller cell area.
- it is also effective to reduce the distance between adjacent ferroelectric capacitors or to reduce the wiring distance. For this reason, a low-dielectric film process is recently required as the wiring interval becomes finer.
- a SOG (Spin On Glass) film is used as a low dielectric constant interlayer insulating film suitable for a low dielectric film process.
- Patent Document 1
- Patent Document 2 is a diagrammatic representation of Patent Document 1
- An object of the present invention is to provide a semiconductor device capable of realizing high integration without deteriorating the characteristics of a ferroelectric capacitor, and a method for manufacturing the same.
- the inventors of the present application have conducted intensive studies to determine the cause of the decrease in the switching charge of the ferroelectric capacitor when the SOG film is used.
- the gas (silane) used in forming the SOG film Contains hydrogen, and this hydrogen is It has been found that a part of the ferroelectric film is reduced by the diffusion in.
- the present inventor has responded to a demand for miniaturization while suppressing a decrease in switching charge by forming a low dielectric constant film as an interlayer insulating film using a hydrogen-free gas. I thought I could do it.
- an interlayer insulating film covering the ferroelectric capacitor is formed by a high-density plasma method using a hydrogen-free gas.
- FIG. 1 is a circuit diagram showing a configuration of a memory cell array of a ferroelectric memory (semiconductor device) manufactured by a method according to an embodiment of the present invention.
- FIGS. 2A to 2K are cross-sectional views sequentially showing a method of manufacturing a ferroelectric memory according to the embodiment of the present invention.
- FIG. 3 is a graph showing the amount of switching charge.
- FIG. 1 is a circuit diagram showing a configuration of a memory cell array of a ferroelectric memory (semiconductor device) manufactured by a method according to an embodiment of the present invention.
- This memory cell array includes a plurality of bit lines 103 extending in one direction, a plurality of word lines 104 extending in a direction perpendicular to the direction in which the bit lines 103 extend, and a plate line 1. 0 5 is provided.
- a plurality of memory cells of the ferroelectric memory according to the present embodiment are arranged in an array so as to match the lattice formed by the bit lines 103, the lead lines 104 and the plate lines 105. It is located at Each memory cell is provided with a ferroelectric capacitor 101 and a TVEOS transistor 102.
- the gate of the MOS transistor 102 is connected to a lead line 104.
- one source / drain of the MOS transistor 102 is connected to the bit line 103, and the other source / drain is connected to one electrode of the ferroelectric capacitor 101.
- the other electrode of the ferroelectric capacitor 101 is connected to the plate line 105.
- Each of the lead line 104 and the plate line 105 is shared by a plurality of MOS transistors 102 arranged in the same direction as the direction in which they extend.
- each bit line 103 is shared by a plurality of MOS transistors 102 arranged in the same direction as the direction in which the bit line 103 extends.
- the direction in which the word line 104 and the plate line 105 extend, and the direction in which the bit line 103 extends may be referred to as a row direction and a column direction, respectively.
- the arrangement of the bit lines 103, the word lines 104, and the plate lines 105 is not limited to the above.
- an element isolation insulating film 2 for partitioning an element active region is formed on a surface of a semiconductor substrate 1 such as a Si substrate by, for example, LOCOS (Local Oxidation Of). Silicon) method.
- a gate insulating film 3, a gate electrode 4, a silicide layer 5, a sidewall 6, and a low-concentration diffusion layer 21 and a high-concentration diffusion layer 22 are formed in an element active region partitioned by the element isolation insulating film 2.
- MOSFET transistor
- a silicon oxynitride film 7 is formed on the entire surface so as to cover the MOS FET, and a silicon oxide film 8 is further formed on the entire surface.
- the silicon oxynitride film 7 is formed in order to prevent the gate insulating film 3 and the like from forming hydrogen when the silicon oxide film 8 is formed.
- a lower electrode film 9 and a ferroelectric film 10 are sequentially formed on the silicon oxide film 8.
- the lower electrode film 9 is composed of, for example, a Ti film and a Pt film formed thereon.
- the ferroelectric film 10 is, for example PZT (Pb (Z r, T i) 0 3) consists of film.
- crystallization of the ferroelectric film 10 is performed.
- ferroelectric An upper electrode film is formed on the film 10, and the upper electrode 11 is formed by patterning the upper electrode film.
- the upper electrode is made of, for example, I r O x film.
- oxygen annealing is performed to recover the damage caused by the pattern jung using the etching.
- a capacitor insulating film is formed by patterning the ferroelectric film 10. Subsequently, oxygen annealing for preventing peeling is performed.
- the A 1 2 0 3 film 1 2 is formed on the entire surface by a sputtering method as a protective film.
- oxygen annealing is performed to alleviate damage due to sputtering.
- the protective layer (A 1 2 0 3 film 1 2), from entering the ferroelectric capacitor of the hydrogen from the outside is prevented.
- the A 1 2 0 3 film 1 3 is formed on the entire surface by a sputtering method as a protective film.
- oxygen annealing is performed to reduce capacitor leakage.
- an interlayer insulating film 14 made of fluorosilicate glass (FSG) is formed on the entire surface by a high-density plasma method.
- the flow rate of the S i F 4 5 0 sccm ⁇ l 0 0 sccm, 0 2 of the flow rate: 2 0 0 sccn! ⁇ 300 sccm
- Ar flow rate 300 sccm ⁇ 500 sccm
- RF power 300 W ⁇ 500 W
- LF power 500 W ⁇ 100 W
- the film forming temperature is preferably from 300 ° C. to 400 ° C.
- the thickness of the interlayer insulating film 14 is, for example, about 1.5 ⁇ m.
- the interlayer insulating film 14 is planarized by a CMP (chemical mechanical polishing) method.
- plasma processing using N 20 gas is performed.
- the surface portion of the interlayer insulating film 14 is slightly nitrided, and it is difficult for moisture to enter the inside.
- This plasma treatment is effective if a gas containing at least one of N and O is used.
- Tsugire in the high-concentration diffusion layer 2 2 until it reaches the hole of the transistor, it is formed in the interlayer insulating film 1 4, A 1 2 0 3 film 1 3, the silicon oxide film 8 and the silicon oxynitride film 7.
- the Ti film and the TiN film are formed by sputtering.
- a barrier metal film (not shown) is formed by continuously forming in the hole. Subsequently, a W film is buried in the hole by a CVD (chemical vapor deposition) method, and the W film is flattened by a CMP method, thereby forming a W plug 15.
- CVD chemical vapor deposition
- a SiON film 16 is formed as an oxidation preventing film of the W plug 15 by, for example, a plasma enhanced CVD method.
- the surface of the W plug 15 is exposed by removing the SiO 2 film 16 by etching back over the entire surface.
- an A1 film is formed with part of the surface of the upper electrode 11, part of the surface of the lower electrode (lower electrode film 9), and the surface of the tAV plug 15 exposed.
- the A1 wiring 17 is formed by patterning the A1 film.
- the W plug 15 and the upper electrode 11 or the lower electrode are connected to each other by the A1 wiring 17.
- an interlayer insulating film is formed, a contact plug is formed, and wirings for the second and subsequent layers from the bottom are formed.
- a cover film made of, for example, a TEOS oxide film and a SiN film is formed to complete a ferroelectric memory having a ferroelectric capacitor.
- a gas containing hydrogen is used in forming the lowermost interlayer insulating film (interlayer insulating film 14) among the interlayer insulating films existing above the ferroelectric capacitor. Therefore, a decrease in the switching charge of the ferroelectric capacitor can be suppressed.
- the interlayer insulating film 14 is formed of FSG, its dielectric constant is low, and it is possible to cope with miniaturization.
- the relative dielectric constant of an interlayer insulating film required for miniaturization is about 2.7 to 3.4.
- the relative permittivity of the FSG film is about 3.1 to 3.4, satisfying the requirements.
- the relative permittivity of the SOG film is about 2.7.
- the relative permittivity of the plasma TEOS (tetraethy 1 orthos i 1 i cat e) film used in conventional ferroelectric memories is about 4.0.
- the result of an experiment on the switching charge amount actually performed by the inventor will be described.
- the inventor produced two samples (examples) according to the above-described embodiment.
- the flow amount of S i F 4 75 sccm, 0 2 flow rate: 250 sc cm, of A r flow: 400 sccm, RF power: 350 OW, LF power: 750 W, film formation temperature: 380 ° C.
- two samples (comparative examples) in which a plasma TEOS film was formed instead of the interlayer insulating film 14 were also manufactured. Then, the switching charge amounts of these four samples were measured.
- Figure 3 shows the results.
- a switching charge amount comparable to the sample using the plasma TEOS film was obtained.
- a plasma TEOS film can obtain a high switching charge amount, it has a high dielectric constant and is not suitable for miniaturization of a semiconductor device.
- the switching charge amount when the SOG film is used is 10 (f CZcm 2 ) or less.
- the force for producing a planar ferroelectric capacitor may be applied to a stack type ferroelectric capacitor.
- a part of a contact plug such as a W plug connected to a transistor such as a MOSFET is connected to a lower electrode of the ferroelectric capacitor.
- the material of the ferroelectric film is not limited to PZT.
- PZT obtained by doping Ca, Sr, La, Nb, Ta, Ir, Z, or W can be used.
- an SBT-based film or a Bi-layered film may be formed.
- the structure of the cell of the ferroelectric memory is not limited to the 1T1C type, but may be a 2T2C type.
- the second and subsequent interlayer insulating films located above the ferroelectric capacitor may be formed using a hydrogen-containing gas. It is preferable to use a gas not containing. Industrial applicability
- a low dielectric constant film can be formed while avoiding the characteristics of a ferroelectric capacitor. For this reason, it is suitable for a fine ferroelectric memory.
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- Semiconductor Memories (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/004824 WO2005101508A1 (ja) | 2004-04-02 | 2004-04-02 | 半導体装置及びその製造方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/004824 WO2005101508A1 (ja) | 2004-04-02 | 2004-04-02 | 半導体装置及びその製造方法 |
Publications (1)
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WO2005101508A1 true WO2005101508A1 (ja) | 2005-10-27 |
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PCT/JP2004/004824 WO2005101508A1 (ja) | 2004-04-02 | 2004-04-02 | 半導体装置及びその製造方法 |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11111930A (ja) * | 1997-10-07 | 1999-04-23 | Sharp Corp | 半導体記憶素子の製造方法 |
JPH11233513A (ja) * | 1998-02-18 | 1999-08-27 | Fujitsu Ltd | 強誘電体膜を用いた装置の製造方法及び装置 |
JP2001077324A (ja) * | 1999-07-16 | 2001-03-23 | Samsung Electronics Co Ltd | SiOF絶縁膜が形成された強誘電体メモリ及びその絶縁膜の形成方法 |
JP2003110095A (ja) * | 2001-08-08 | 2003-04-11 | Agilent Technol Inc | 集積回路およびその形成方法 |
JP2003273332A (ja) * | 2002-03-19 | 2003-09-26 | Fujitsu Ltd | 半導体装置及びその製造方法 |
-
2004
- 2004-04-02 WO PCT/JP2004/004824 patent/WO2005101508A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11111930A (ja) * | 1997-10-07 | 1999-04-23 | Sharp Corp | 半導体記憶素子の製造方法 |
JPH11233513A (ja) * | 1998-02-18 | 1999-08-27 | Fujitsu Ltd | 強誘電体膜を用いた装置の製造方法及び装置 |
JP2001077324A (ja) * | 1999-07-16 | 2001-03-23 | Samsung Electronics Co Ltd | SiOF絶縁膜が形成された強誘電体メモリ及びその絶縁膜の形成方法 |
JP2003110095A (ja) * | 2001-08-08 | 2003-04-11 | Agilent Technol Inc | 集積回路およびその形成方法 |
JP2003273332A (ja) * | 2002-03-19 | 2003-09-26 | Fujitsu Ltd | 半導体装置及びその製造方法 |
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