WO2006090441A1 - 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
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- WO2006090441A1 WO2006090441A1 PCT/JP2005/002890 JP2005002890W WO2006090441A1 WO 2006090441 A1 WO2006090441 A1 WO 2006090441A1 JP 2005002890 W JP2005002890 W JP 2005002890W WO 2006090441 A1 WO2006090441 A1 WO 2006090441A1
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- Prior art keywords
- film
- source
- drain diffusion
- semiconductor device
- semiconductor substrate
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000009792 diffusion process Methods 0.000 claims abstract description 73
- 239000000758 substrate Substances 0.000 claims abstract description 40
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 23
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 23
- 229910052710 silicon Inorganic materials 0.000 claims description 23
- 239000010703 silicon Substances 0.000 claims description 23
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 10
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 10
- 238000005468 ion implantation Methods 0.000 claims description 9
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 230000015654 memory Effects 0.000 abstract description 40
- 239000010408 film Substances 0.000 description 101
- 239000010410 layer Substances 0.000 description 23
- 238000009826 distribution Methods 0.000 description 9
- 239000012535 impurity Substances 0.000 description 7
- 239000011229 interlayer Substances 0.000 description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- -1 Metal Oxide Nitride Chemical class 0.000 description 5
- 238000005530 etching Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 239000002784 hot electron Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007687 exposure technique Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B69/00—Erasable-and-programmable ROM [EPROM] devices not provided for in groups H10B41/00 - H10B63/00, e.g. ultraviolet erasable-and-programmable ROM [UVEPROM] devices
-
- 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
Definitions
- the present invention relates to a nonvolatile memory and a manufacturing method thereof, and more particularly to a nonvolatile memory having an ONO (Oxide Nitride Oxide) film and a manufacturing method thereof.
- ONO Oxide Nitride Oxide
- nonvolatile memories which are semiconductor devices capable of rewriting data
- technical development for the purpose of miniaturization of the memory cell is being promoted in order to increase the storage capacity.
- a floating gate type flash memory that accumulates electric charges in a floating gate has been widely used.
- memory cells become more miniaturized to achieve higher storage densities, it becomes difficult to design floating gate flash memories.
- a thin film of tunnel oxide film is required.
- the leakage current flowing through the tunnel oxide film increases, and when the charge accumulated in the floating gate is lost due to the introduction of defects in the tunnel oxide film, the reliability is increased. This is because a failure occurs.
- a flash memory power S having a NO (Oxide Nitride Oxide) film such as a MONOS (Metal Oxide Nitride Oxide Silicon) type or a SOONO S (Silicon Oxide Nitride Oxide Silicon) type.
- NO Oxide Nitride Oxide
- This flash memory accumulates charges in the silicon nitride film layer, which is an insulating film. Therefore, even if there is a defect in the tunnel oxide film, loss of charges is difficult to occur as in the floating gate type. Further, it is possible to store multi-valued bits in the trap layer of the same memory cell, which is advantageous for increasing the storage capacity of the nonvolatile memory.
- a flash memory having an ONO film is described in Patent Document 1, for example.
- FIG. 1 is a top view of a conventional memory cell region (the protective film 32, the wiring 34, the interlayer insulating film 30, and the ONO film 16a are not shown).
- Figure 2 is an enlarged view of Figure 1.
- 3 (a) is a cross-sectional view taken along the line A-- in FIG. 2, and FIG.
- the memory cell region includes a source / drain diffusion region 14 also serving as a bit line extending in the vertical direction formed in the semiconductor substrate 10a, and formed on the semiconductor substrate.
- a control gate 20a also serving as a word line extending in the lateral direction is arranged.
- the source / drain diffusion region 14 is formed by a diffusion region by ion implantation of impurities into the P-type silicon semiconductor substrate 10a and heat treatment, and is carried in the semiconductor substrate 10a.
- a NO film 16a is formed on the semiconductor substrate 10a, and a control gate 20a is formed on the NO film 16a.
- the semiconductor substrate 10a under the control gate 20a and between the source and drain diffusion regions 14 is a channel 15a.
- a silicon oxide film such as BPSG (Boro Phospho Silicated Glass) is formed on the transistor as the interlayer insulating film 30.
- a wiring 34 is formed on the interlayer insulating film 30 and is connected to the source / drain diffusion region 14 through the contact hole 40.
- a protective film 32 is formed on the wiring 34.
- the ONO film 16a includes a silicon oxide layer as a tunnel oxide film, a silicon nitride layer as a trap layer, and a silicon oxide layer as a top oxide film.
- Data is written by applying a high electric field to the channel 15a and injecting hot electrons into the trap layer on the channel 15a and accumulating them. The charge accumulated in the trap layer is retained because the trap layer is surrounded by the silicon oxide film. Data can be erased by injecting hot holes generated in channel 15a into the trap layer or by passing F_N (Fowler-Nordheim) tunnel current through the tunnel oxide layer.
- F_N Finler-Nordheim
- charge accumulation can be performed in two locations in one transistor, so binary data can be written. As a result, the storage capacity can be increased.
- the memory cell can be miniaturized.
- the source / drain diffusion region 14 is formed by the diffusion region, Higher resistance than metal. For this reason, only the source / drain diffusion region 14 which is the bit line will deteriorate the data writing and reading characteristics. Therefore, as shown in FIG. 1, a bit line 'contact region 42 is arranged for each of a plurality of word lines (control gates) 20a, and in the bit line contact region 42, the source and drain diffusion regions 14 as bit lines are connected. It is connected to the wiring 34 formed of metal through the contact hole 40. This lowers the resistance of the bit line and improves the data write and read characteristics.
- Patent Document 1 U.S. Patent No. 6011725
- the conventional technique has a problem that it is difficult to miniaturize the memory cell.
- the source / drain diffusion region 14 is formed by a diffusion region.
- the source / drain diffusion region 14 also serves as a bit line and needs to be extended under the control gate 20a also serving as a word line. Therefore, the source / drain diffusion region 14 is formed before the formation of the control gate 20a.
- a heat treatment process of manufacturing the control gate 20 a and the wiring 34 is performed.
- impurities in the source / drain diffusion region 14 are diffused in the lateral direction, and the width of the source / drain diffusion region 14 is increased. This will reduce the channel length.
- the channel length becomes narrow, it is not possible to secure a sufficient region for storing charges in the NO film 16a. To prevent this, the channel length can be secured by widening the distance between the source and drain diffusion regions.
- miniaturization of memory cells becomes difficult.
- the source / drain diffusion region 14 also serves as a bit line, which increases the resistance of the bit line. Therefore, it is necessary to frequently connect the wiring 34 with the contact hole 40 in order not to deteriorate the data writing and reading characteristics. This requires a large number of bit line 'contact regions 42, making it difficult to miniaturize memory cells.
- the present invention provides a half-layer device capable of securing a constant channel length capable of storing charges and miniaturizing a memory cell even when there is lateral diffusion of the source / drain diffusion region, and its manufacture.
- the purpose is to provide a manufacturing method.
- the present invention comprises a semiconductor substrate having a source / drain diffusion region, an ONO film formed on the semiconductor substrate, and a control gate formed on the ON film,
- a groove portion located between the source and drain diffusion regions under the control gate is provided on the surface of the semiconductor substrate.
- the present invention is the semiconductor device, wherein the groove is separated from the source / drain diffusion region. According to the present invention, a semiconductor device in which data can be easily written can be provided.
- the present invention is a semiconductor device in which the source / drain diffusion region is formed in a self-aligned manner with the groove. According to the present invention, it is possible to provide a semiconductor device in which the groove portion is reliably separated from the source and drain diffusion regions and data can be easily written.
- the present invention is a semiconductor device in which the source and drain diffusion regions are common to a bit line. According to the present invention, the memory cell can be miniaturized.
- the present invention is a semiconductor device in which the NO film is in contact with the surface of the groove. According to the present invention, it is possible to secure a certain channel length capable of accumulating charges in the ONO film.
- the present invention includes a first step of forming a groove on the surface of a semiconductor substrate, a second step of forming a source / drain diffusion region on both sides of the groove in the semiconductor substrate, and a step on the semiconductor substrate. And a step of forming a control gate on the ONO film, and a method of manufacturing a semiconductor device.
- a groove in the channel by forming a groove in the channel and widening the effective channel length, even if lateral diffusion of the source / drain diffusion region occurs, a constant channel length capable of accumulating charges can be obtained. It is possible to provide a method for manufacturing a half-layer device that can be ensured and memory cells can be miniaturized.
- the first step includes thermal oxidation by thermally oxidizing the surface of the semiconductor substrate.
- a method for manufacturing a semiconductor device comprising: a third step of forming a silicon nitride film; and a step of removing the thermally oxidized silicon film. According to the present invention, it is possible to provide a method for manufacturing a semiconductor device in which the distribution of groove depth is improved and the distribution of transistor characteristics is small.
- the present invention includes, before the first step, a step of forming an insulating film having an opening on the semiconductor substrate, and a step of forming a side wall on the side of the opening,
- the third step is a method of manufacturing a semiconductor device, wherein the third step is a step of forming a thermally oxidized silicon film by thermally oxidizing the surface of the semiconductor substrate using the insulating film and the side wall as a mask. According to the present invention, it is possible to provide a method for manufacturing a semiconductor device in which a groove is separated from a source / drain diffusion region and data can be easily written.
- the present invention is a method for manufacturing a semiconductor device, wherein the second step is ion implantation using the thermally oxidized silicon film and the side wall as a mask to form the source / drain diffusion region. According to the present invention, it is possible to provide a method for manufacturing a semiconductor device in which the groove and the source / drain diffusion region force are reliably separated and data can be easily written.
- the present invention is the method for manufacturing a semiconductor device, wherein the insulating film is a silicon nitride film and the side wall is a silicon oxide film. According to the present invention, when the insulating film is removed, the side wall and the thermally oxidized silicon film can be selectively left.
- the present invention by forming a groove in the channel and widening the effective channel length, it is possible to accumulate charges even if lateral diffusion of the source-drain diffusion region occurs. It is possible to provide a half layer device capable of securing a channel length and miniaturizing a memory cell and a manufacturing method thereof.
- FIG. 1 is a top view (part 1) of a conventional memory cell region.
- FIG. 2 is a top view (part 2) of the conventional memory cell region.
- FIG. 3 is a cross-sectional view of Conventional Technique 1 , (a) is a cross-sectional view of A— in FIG. 2, and (b) is a cross-sectional view of B— in FIG.
- FIG. 4 is a top view of the memory cell area of the first embodiment.
- FIG. 5 is a cross-sectional view of Example 1, (a) is a cross-sectional view taken along the line AA ′ of FIG. FIG.
- FIG. 6 is a cross-sectional view (part 1) showing the manufacturing process of Example 1, (a) is a cross-sectional view corresponding to A— ⁇ in FIG. 4, and (b) is B— ⁇ in FIG. It is equivalent sectional drawing.
- FIG. 7 is a cross-sectional view (part 2) showing the manufacturing process of Example 1, (a) is a cross-sectional view corresponding to A—A ′ in FIG. 4, and (b) is a B— It is sectional drawing equivalent to B '.
- FIG. 8 is a cross-sectional view (part 3) showing the manufacturing process of Example 1, (a) is a cross-sectional view corresponding to A—A ′ of FIG. 4, and (b) is a B— It is sectional drawing equivalent to B '.
- FIG. 9 is a cross-sectional view (No. 4) showing the manufacturing process of Example 1, (a) is a cross-sectional view corresponding to A—A ′ of FIG. 4, and (b) is a B— It is sectional drawing equivalent to B '.
- FIG. 10 is a sectional view (No. 5) showing the manufacturing process of Example 1, (a) is a sectional view corresponding to AA ′ in FIG. 4, and (b) is BB ′ in FIG. FIG.
- FIG. 11 is a cross-sectional view (part 6) showing the manufacturing process of Example 1, (a) is a cross-sectional view corresponding to AA ′ of FIG. 4, and (b) is a cross-sectional view of FIG. FIG.
- FIG. 12 is a cross-sectional view (No. 7) showing the manufacturing process of Example 1, (a) is a cross-sectional view corresponding to AA ′ of FIG. 4, and (b) is a cross-sectional view of FIG. FIG.
- FIG. 4 is a top view of the memory cell region of Example 1 (the protective film 32, the wiring 34, the interlayer insulating film 30, and the ONO film 16) are not shown), and FIG. 5 (a) is the same as FIG. Fig. 5 (b) is a cross-sectional view along the line A-A '.
- the memory cell region has a source / drain diffusion region 14 that doubles as a bit line extending in the vertical direction in the semiconductor substrate 10 and a control that doubles as a word line extending in the horizontal direction on the semiconductor substrate.
- Gate 20 is located.
- a groove 18 (indicated by a broken line in FIG. 4) is formed in the channel 15 region between the source and drain diffusion regions 14 in the same direction as the direction in which the source and drain diffusion regions 14 extend. .
- the source / drain diffusion region 14 is carried on the P-type silicon semiconductor substrate 10.
- An ONO film 16 is formed on the semiconductor substrate 10, and a control gate 20 is formed on the ONO film 16.
- Semiconductor under control gate 20 and between source and drain diffusion regions Substrate 10 is channel 15.
- a groove 18 is formed in the channel 15. That is, the trench 18 is formed on the surface of the semiconductor substrate 10 under the control gate 20 and between the source / drain diffusion regions.
- An interlayer insulating film 30 is formed on the transistor.
- a wiring 34 is formed on the interlayer insulating film 30 and is connected to the source / drain diffusion region 14 through the contact hole 40.
- a protective film 32 is formed on the wiring 34.
- the effective channel length of the channel 15 is widened by forming the groove 18.
- the ON film 16 capable of accumulating charges is also widened. For this reason, even if lateral diffusion of the source-drain diffusion region occurs, a half-layer device capable of securing a certain channel length capable of storing charges and miniaturizing the memory cell can be obtained. This makes it easy to refine.
- FIG. 6A to 12A are cross-sectional views corresponding to AA ′ in FIG. 4, and FIG. 6B is a cross-sectional view corresponding to BB ′ in FIG.
- a silicon oxide film 22 is formed on a P-type silicon semiconductor substrate 10 (or a P-type region in the semiconductor substrate) by thermal oxidation.
- an insulating film 24 is formed on the silicon oxide film 22 using, for example, the CVD method, for example, a silicon nitride film having a thickness of 150 nm is formed.
- a predetermined region of the insulating film 24 is removed using a normal exposure technique and dry etching to form an opening.
- the width of the opening is, for example, 200 nm.
- a silicon oxide film having a thickness of, for example, 70 nm is formed on the entire surface and anisotropic etching is performed on the entire surface, so that, for example, the side of the silicon oxide film having a width of 50 nm is formed on the side of the opening of the insulating film 24.
- Wall 26 is formed. By changing the thickness of the silicon oxide film formed on the entire surface, the side wall 26 can have a desired width.
- the surface of the semiconductor substrate 10 is thermally oxidized to form a thermally oxidized silicon film 28.
- the thickness of the silicon oxide film is set to, for example, 300 nm, a groove portion 18 having a thickness of about 140 nm is formed in the semiconductor substrate 10.
- the width of the groove 18 is substantially the distance between the side walls 26 facing each other. For example, when the width of the opening of the insulating film 24 is 200 nm and the width of the side wall 26 is 50 nm, the width of the trench 18 is about lOOnm.
- the silicon nitride film 24 is removed using hot phosphoric acid.
- the side wall 26 is formed of a silicon oxide film and is not removed by hot phosphoric acid.
- Thermally oxidized silicon film 28 The source / drain diffusion region 14 is formed by ion implantation of, for example, arsenic into the sidewall 26 mask and heat treatment. The ion implantation is performed, for example, with an ion energy of 10-15 keV and a dose of 1 ⁇ 10 15 cm- 3 .
- the semiconductor substrate 10 between the source and drain diffusion regions 14 becomes the channel 15.
- the thermally oxidized silicon film 28, the side wall 26, and the silicon oxide film 22 are removed by, for example, hydrofluoric acid.
- a groove 18 is formed between the source and drain diffusion regions 14. The groove 18 is formed to be separated from the source / drain diffusion region 14 by the width of the side wall 26.
- the silicon oxide film of the tunnel oxide film is subjected to, for example, thermal oxidation or CVD
- the silicon nitride film of the trap layer is subjected to the CVD method
- the silicon oxide film of the top oxide film is heated, for example. It is formed by oxidation or CVD method.
- the film thicknesses of the tunnel oxide film, trap layer, and top oxide film are, for example, 7 nm, 10 nm, and 10 nm.
- a control gate 20 is formed by forming, for example, a polycrystalline silicon film on the NO film 16 and etching a predetermined region. It is also possible to reduce the resistance of the control gate 20 by siliciding the polycrystalline silicon.
- the interlayer insulating film 30 is formed of a silicon oxide film such as BPSG, and the contact hole 40 is formed in the bit line 'contact region 42.
- the wiring 34 is made of, for example, aluminum, and the protective film 32 is formed.
- the groove 18 can be formed by, for example, etching. However, when the groove portion 18 is formed by etching, the depth of the groove portion 18 also has a distribution due to the in-wafer surface distribution and reproducibility of the etching rate. When the depth of the groove 18 is different, the channel length of the transistor is different, and the transistor characteristics are also different. As a result, the distribution of transistor characteristics increases.
- the thermally oxidized silicon film 28 is formed and removed to form the groove 18.
- the film thickness of the thermally oxidized silicon film 28 is determined by temperature, oxygen partial pressure and time. Temperature, oxygen partial pressure and time are easily controlled items. Therefore, the film thickness of the thermally oxidized silicon film 28 can be formed with good wafer in-plane distribution and reproducibility. Since the depth of the groove 18 is the thermally oxidized silicon semiconductor substrate 10, the depth of the groove 18 is also divided into the wafer plane. Can be formed with good fabric and reproducibility. As described above, the channel length distribution and reproducibility of the channel length of the transistor can be improved, and the distribution and reproducibility of the transistor characteristics can be improved.
- the groove 18 is preferably formed by forming and removing the thermal silicon oxide film 28 on the semiconductor substrate 10.
- a process of forming the source / drain diffusion region 14 is performed by ion implantation using the thermally oxidized silicon film 28 and the side wall 26 as a mask.
- the trench 18 can be separated from the source / drain diffusion region 14 by the width of the side wall 26. That is, the source / drain region 14 is formed in a self-aligned manner with the groove 18. If the trench 18 is in contact with the source / drain diffusion region 14, the impurity concentration profile from the channel 15 to the source / drain diffusion region 14 is not steep. This is because the profile of impurity concentration by ion implantation is steeper in the direction perpendicular to the direction of ion implantation than in the parallel direction.
- the impurity concentration profile from the channel 15 to the source / drain diffusion region 14 is not steep, the electric field at the end of the source / drain diffusion region 14 of the channel 15 becomes small and hot electrons are unlikely to occur during data writing. Become. That is, it becomes difficult to write data.
- the groove 18 and the source / drain diffusion region 14 can be reliably separated. Thereby, the profile of the impurity concentration from the channel 15 to the source / drain diffusion region 14 can be kept sharp. Therefore, when data is written, the electric field at the end of the source / drain diffusion region 14 of the channel 15 is increased, and hot electrons are easily generated. In other words, data can be easily written. Further, since the source / drain diffusion region 14 is formed in a self-aligned manner with respect to the groove 18, the distance between the source / drain diffusion region 14 and the groove 18 can be formed with high accuracy. Thereby, for example, the distribution of transistor characteristics such as the above-described data writing characteristics can be reduced.
- Example 1 it is exemplified that the insulating film 24 is a silicon nitride film and the side wall 26 is a silicon oxide film.
- the thermal silicon oxide film 28 when the insulating film 24 is removed, it is easily and selectively removed with respect to the silicon oxide film 22, the side wall 26, and the thermal silicon oxide film 28 by using hot phosphoric acid. can do.
- the present invention is not limited to such specific embodiments. Various modifications and changes can be made within the scope of the gist of the present invention described in the scope of claims.
- the present invention can be applied to MONOS (Metal Oxide Nitride Oxide Silicon) type or SONOS (Silicon Oxide Nitride Oxide Silicon) type flash memory.
- the trap layer of the ONO film may be an aluminum oxide film or any other film that functions as a trap layer.
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- Non-Volatile Memory (AREA)
- Semiconductor Memories (AREA)
Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2007504576A JP5014118B2 (ja) | 2005-02-23 | 2005-02-23 | フラッシュメモリを備える半導体装置の製造方およびフラッシュメモリを備える半導体装置 |
PCT/JP2005/002890 WO2006090441A1 (ja) | 2005-02-23 | 2005-02-23 | 半導体装置及びその製造方法 |
US11/362,317 US7573091B2 (en) | 2005-02-23 | 2006-02-23 | Semiconductor device and method of manufacturing the same |
US12/502,891 US7977189B2 (en) | 2005-02-23 | 2009-07-14 | Semiconductor device and method of manufacturing the same |
Applications Claiming Priority (1)
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PCT/JP2005/002890 WO2006090441A1 (ja) | 2005-02-23 | 2005-02-23 | 半導体装置及びその製造方法 |
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US11/362,317 Continuation US7573091B2 (en) | 2005-02-23 | 2006-02-23 | Semiconductor device and method of manufacturing the same |
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Citations (4)
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JPH0412573A (ja) * | 1990-05-02 | 1992-01-17 | Matsushita Electron Corp | 不揮発性半導体記憶装置およびその製造方法 |
JPH07226513A (ja) * | 1994-01-28 | 1995-08-22 | Lg Semicon Co Ltd | Mosトランジスタの製造方法 |
JP2004111737A (ja) * | 2002-09-19 | 2004-04-08 | Fasl Japan Ltd | 半導体装置の製造方法 |
JP2004193178A (ja) * | 2002-12-06 | 2004-07-08 | Fasl Japan 株式会社 | 半導体記憶装置及びその製造方法 |
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US5376572A (en) * | 1994-05-06 | 1994-12-27 | United Microelectronics Corporation | Method of making an electrically erasable programmable memory device with improved erase and write operation |
US6768165B1 (en) * | 1997-08-01 | 2004-07-27 | Saifun Semiconductors Ltd. | Two bit non-volatile electrically erasable and programmable semiconductor memory cell utilizing asymmetrical charge trapping |
US6727161B2 (en) * | 2000-02-16 | 2004-04-27 | Cypress Semiconductor Corp. | Isolation technology for submicron semiconductor devices |
JP2004012573A (ja) | 2002-06-04 | 2004-01-15 | Fujikura Ltd | 平型光ファイバコード及びその製造方法 |
US6610586B1 (en) * | 2002-09-04 | 2003-08-26 | Macronix International Co., Ltd. | Method for fabricating nitride read-only memory |
TW200514256A (en) * | 2003-10-15 | 2005-04-16 | Powerchip Semiconductor Corp | Non-volatile memory device and method of manufacturing the same |
US7060551B2 (en) * | 2004-06-18 | 2006-06-13 | Macronix International Co., Ltd. | Method of fabricating read only memory and memory cell array |
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2005
- 2005-02-23 JP JP2007504576A patent/JP5014118B2/ja active Active
- 2005-02-23 WO PCT/JP2005/002890 patent/WO2006090441A1/ja not_active Application Discontinuation
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2006
- 2006-02-23 US US11/362,317 patent/US7573091B2/en active Active
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2009
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JPH0412573A (ja) * | 1990-05-02 | 1992-01-17 | Matsushita Electron Corp | 不揮発性半導体記憶装置およびその製造方法 |
JPH07226513A (ja) * | 1994-01-28 | 1995-08-22 | Lg Semicon Co Ltd | Mosトランジスタの製造方法 |
JP2004111737A (ja) * | 2002-09-19 | 2004-04-08 | Fasl Japan Ltd | 半導体装置の製造方法 |
JP2004193178A (ja) * | 2002-12-06 | 2004-07-08 | Fasl Japan 株式会社 | 半導体記憶装置及びその製造方法 |
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US7977189B2 (en) | 2011-07-12 |
US20090325354A1 (en) | 2009-12-31 |
US20060240620A1 (en) | 2006-10-26 |
JP5014118B2 (ja) | 2012-08-29 |
US7573091B2 (en) | 2009-08-11 |
JPWO2006090441A1 (ja) | 2008-08-07 |
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