WO2004038805A1 - 横型短チャネルdmos及びその製造方法並びに半導体装置 - Google Patents
横型短チャネルdmos及びその製造方法並びに半導体装置 Download PDFInfo
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- WO2004038805A1 WO2004038805A1 PCT/JP2003/011884 JP0311884W WO2004038805A1 WO 2004038805 A1 WO2004038805 A1 WO 2004038805A1 JP 0311884 W JP0311884 W JP 0311884W WO 2004038805 A1 WO2004038805 A1 WO 2004038805A1
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- 238000004519 manufacturing process Methods 0.000 title claims description 87
- 238000000034 method Methods 0.000 title claims description 38
- 239000000758 substrate Substances 0.000 claims abstract description 86
- 229910052751 metal Inorganic materials 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 25
- 238000009792 diffusion process Methods 0.000 claims description 128
- 239000012535 impurity Substances 0.000 claims description 103
- 238000005468 ion implantation Methods 0.000 claims description 74
- 238000000407 epitaxy Methods 0.000 claims description 39
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 230000003647 oxidation Effects 0.000 claims description 10
- 238000007254 oxidation reaction Methods 0.000 claims description 10
- 230000000873 masking effect Effects 0.000 claims description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 abstract description 39
- 229920005591 polysilicon Polymers 0.000 abstract description 39
- 239000010410 layer Substances 0.000 description 250
- 230000000694 effects Effects 0.000 description 30
- 230000015556 catabolic process Effects 0.000 description 18
- 230000005684 electric field Effects 0.000 description 18
- -1 phosphorus ions Chemical class 0.000 description 11
- 230000007423 decrease Effects 0.000 description 9
- 239000011229 interlayer Substances 0.000 description 8
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 239000008188 pellet Substances 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 230000003213 activating effect Effects 0.000 description 3
- 229910052785 arsenic Inorganic materials 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000007943 implant Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 102220470087 Ribonucleoside-diphosphate reductase subunit M2_S20A_mutation Human genes 0.000 description 1
- YXTPWUNVHCYOSP-UHFFFAOYSA-N bis($l^{2}-silanylidene)molybdenum Chemical compound [Si]=[Mo]=[Si] YXTPWUNVHCYOSP-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910021344 molybdenum silicide Inorganic materials 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 102200082907 rs33918131 Human genes 0.000 description 1
- WQJQOUPTWCFRMM-UHFFFAOYSA-N tungsten disilicide Chemical compound [Si]#[W]#[Si] WQJQOUPTWCFRMM-UHFFFAOYSA-N 0.000 description 1
- 229910021342 tungsten silicide Inorganic materials 0.000 description 1
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Definitions
- the present invention relates to a horizontal short channel DMOS suitably used as a power MOSFET, and a method for producing the same.
- the present invention also relates to a semiconductor device including the horizontal short channel DMOS.
- FIG. 13 is a cross-sectional view of a conventional horizontal short channel DMOS 90.
- the horizontal short-channel DMOS 90 is composed of an N-type epitaxial layer 910 formed near the surface of the P_-type semiconductor substrate 908,
- N + -type drain region 918 formed near the surface of the N-type epitaxial layer 910;
- a polysilicon gate electrode 922 formed above the channel formation region C with a gate insulating film 920 interposed therebetween for example, see Japanese Patent Application Laid-Open No. Fig. 1) and Hiroshi Yamazaki, "Application Technology of Power MOS FETs" Nikkan Kogyo Shimbun (first edition, 8th print), October 23, 1998, Fig. 2.1 and pages 9 to 12 See page.
- the N + -type source region 916 is connected to a source terminal (not shown) via the source electrode 926, and the N + -type drain region 918 is connected to the drain electrode 928 Not shown through
- the polysilicon gate electrode 9222 is connected to a gate terminal (not shown).
- the P- type semiconductor substrate 908 is connected to a ground 932 fixed to 0V.
- this horizontal short-channel DMOS 90 has a problem that high-speed switching is not easy because the resistance of the polysilicon gate electrode is high.
- FIG. 14 is a cross-sectional view of another conventional horizontal short channel DMOS 92.
- the horizontal short channel DM ⁇ S 92 has a gate resistance reducing metal layer 930 formed on the interlayer insulating film 924 connected to the polysilicon gate electrode 922. It has the structure which was done. For this reason, according to the lateral short-channel DMOS 92, since the gate resistance reducing metal layer 930 is connected to the polysilicon gate electrode 922, the resistance of the gate electrode layer as a whole decreases, High-speed switching is possible.
- the contact hole (A) of the interlayer insulating film 924 provided to connect the polysilicon gate electrode 922 and the metal layer 930 for reducing the gate resistance is provided.
- an isolation region (B) for electrically isolating the metal layer 930 for reducing the gate resistance from the source electrode 926 and the drain electrode 928 is required.
- the present invention has been made to solve the above problems, and an object of the present invention is to provide a lateral short-channel DMOS having low gate resistance and on-resistance, and having excellent high-speed switching characteristics and current driving characteristics. And Further, the present invention, c is an object to provide a method of manufacturing a lateral short-channel DMOS capable of producing such excellent lateral short-channel DMOS Disclosure of the invention
- a first conductive type epitaxy layer formed on the surface of the semiconductor substrate; and a second conductive type opposite to the first conductive type, including a channel forming region formed near the surface of the first conductive type epitaxy layer.
- a first conductivity type source region formed near the surface of the second conductivity type well
- the first conductive type epitaxial layer is formed near the surface of the first conductive type epitaxial layer so as not to be in contact with the second conductive type well.
- the first conductive type impurity is more concentrated than the first conductive type epitaxial layer.
- the first conductivity type includes an on-resistance reducing plug,
- a first conductivity type drain region formed in the vicinity of the surface of the first conductivity type on-resistance reducing well; and a region from the first conductivity type source region to the first conductivity type drain region.
- a gate electrode formed at least above the channel formation region via a gut insulating film;
- the first conductivity type DMQS is provided near the surface of the first conductivity type epitaxy layer so as not to contact the second conductivity type well.
- An on-resistance reducing screw is formed, and the first conductive type drain region is formed near the surface of the first conductive type on-resistance reducing well.
- Most of the current path between the source region of the first conductivity type and the source region of the first conductivity type is a low-resistance first conductivity type well for reducing the on-resistance, so the gate length must be increased to reduce the gate resistance.
- the horizontal short-channel DMOS according to the first embodiment of the present invention has a low gate resistance and low on-resistance, and is excellent in high-speed switching characteristics and current driving characteristics.
- the on-resistance of the first conductivity type including a higher concentration of impurities of the first conductivity type than the epitaxy layer of the first conductivity type. Since the reduction well is provided separately, the on-resistance at the time of on can be reduced without increasing the impurity concentration itself of the first conductive type epitaxy layer. There is no decrease in pressure resistance.
- the impurity concentration of the on-resistance reducing plug of the first conductivity type is 1 ⁇ 1 or more Zcm 3
- the impurity concentration of Epitakisharu layer is preferably not more than 1 XI 0 + 17 or Zc m3.
- the impurity concentration of said first conductivity type on-resistance low.
- 2 X 1 0 + is number / cm 3 or more, 5x1 O + IS pieces / cm 3 or more More preferably,
- the impurity concentration of Epitakisharu layer of the first conductivity type, more preferably 5x1 0 + 16 pieces / c ni 3 or less, 2 X 1 0 + 16 or 0? 11 3 or less is still more preferable.
- the second conductive type well and the first conductive type drain region are provided near the surface of the first conductive type epitaxial layer.
- a floating diffusion layer of the second conductivity type is formed in a region between Preferably, it is formed.
- the electric field intensity at the time of reverse bias in the vicinity of the region where the second conductivity type diffusion layer is formed is reduced, and the breakdown voltage can be further stabilized.
- the current between the drain region of the first conductivity type and the source region of the first conductivity type at the time of ON is deeper than the diffusion layer of the second conductivity type, avoiding the diffusion layer of the second conductivity type. Since it flows through the portion (the first conductivity type epitaxial layer), there is no increase in on-resistance.
- the impurity concentration of the second conductivity type diffusion layer is preferably in the range of 3X10 + IS pieces / c m3 ⁇ 5xl 0 + 18 cells / c m 3, 1 X 1 0 +17 number Z cm 3 ⁇ it is further favorable preferable in the range of 1 X 1 0 + 18 cells / c m3.
- the second conductivity type diffusion layer is formed so as not to be in contact with the first conductivity type on-resistance reducing well. .
- the second conductive type diffusion layer which is not biased, is configured not to be in contact with the first conductive type on-resistance reducing module.
- the increase can be minimized.
- the gate electrode in the region from the second conductive type diffusion layer to the first conductive type drain region, the gate electrode may be a field oxide film. It is preferable to face the first conductive type epitaxy layer through the layer.
- the lateral short-channel DMOS according to the second aspect of the present invention includes:
- a first conductivity type source region formed near the surface of the second conductivity type well
- the first conductive type is formed near the surface of the epitaxial layer so as to be in contact with the first conductive type well and not to be in contact with the second conductive type well.
- a first conductivity type drain region formed near the surface of the first conductivity type on-resistance reducing well
- the horizontal short-channel DMOS according to the second aspect of the present invention For example, a first conductivity type on-resistance reducing well is formed near the surface of the epitaxial layer so as not to contact the second conductivity type well, and the surface of the first conductivity type on-resistance reducing well is formed. Since the drain region of the first conductivity type is formed in the vicinity, most of the current path between the drain region of the first conductivity type and the source region of the first conductivity type at the time of ON is the low-resistance type. Since it is a one-conduction-type on-resistance reduction tool, the overall on-resistance can be sufficiently reduced even if the gate length is increased to reduce the gate resistance. Therefore, the lateral short-channel DMOS according to the second embodiment of the present invention has a low gate resistance and on-resistance, and is excellent in high-speed switching characteristics and current driving characteristics.
- the on-resistance of the first conductivity type containing an impurity of the first conductivity type higher than that of the first conductivity type is reduced. Since the well is separately provided, the resistance at the time of ON can be reduced without increasing the impurity concentration of the first conductivity type well, and the withstand voltage performance of the horizontal short-channel DMOS can be reduced. Absent.
- a horizontal conductive short-circuit is formed by forming a first conductive type layer inside the epitaxial layer.
- the withstand voltage of the channel DMOS can be controlled by the impurity concentration of the first conductivity type well.
- the impurity concentration of the epitaxial layer can be adjusted to a concentration (eg, the first conductivity type) suitable for another element (eg, a logic circuit). (Lower than the above-mentioned concentration), and a semiconductor device having more excellent characteristics can be obtained.
- the impurity concentration of the first conductivity type ON resistance lowering Ueru is a LXL O + IS pieces Zc m 3 or more, the first conductivity type Is the impurity concentration of I xl O + i? Pcs / cm 3 or less.
- the impurity concentration of the first-conductivity-type on-resistance reducing well is more preferably 2 ⁇ 10 + is Zcm 3 or more, and more preferably 5 ⁇ 1 O + is / cm 3 or more. Preferred. Further, the impurity concentration of the first conductivity type well is more preferably 5 ⁇ 1 O + ie / cm 3 or less, and further preferably 2 ⁇ 1 O + is / cm 3 or less.
- a space between the second conductivity type well and the first conductivity type drain region is provided in the vicinity of the surface of the first conductivity type well. It is preferable that a diffusion layer of the second conductivity type in a floating state is formed in the region so as not to be in contact with the second conductivity type well.
- the electric field intensity at the time of reverse bias in the vicinity of the region where the second conductivity type diffusion layer is formed is reduced, and the breakdown voltage can be further stabilized.
- the current between the drain region of the first conductivity type and the source region of the first conductivity type at the time of ON is deeper than the diffusion layer of the second conductivity type, avoiding the diffusion layer of the second conductivity type. Because it flows through the portion (the first conductivity type well), there is no increase in on-resistance.
- the impurity concentration of the second conductivity type diffusion layer is more preferably in the range of 3x1 0 + IS pieces Z cm 3 ⁇ 5xl 0 + 18 or Z c m3, 1 X 1 0 +17 More preferably, it is in the range of cm3 to 1x10 + 18 pieces / cm3.
- the second conductivity type diffusion layer is formed so as not to be in contact with the first conductivity type on-resistance reducing element. .
- the non-biased diffusion layer of the second conductivity type is configured not to be in contact with the on-resistance reducing plug of the first conductivity type, the withstand voltage is reduced and the leakage current is reduced. The increase can be minimized.
- the good electrode is formed via a field oxide film. Therefore, it is preferable to face the epitaxial layer.
- the electric field intensity at the time of reverse bias in the vicinity of the region where the second conductivity type diffusion layer is formed is reduced, and therefore the first conductivity type diffusion layer is removed from the second conductivity type diffusion layer.
- the thickness of the gate insulating film can be increased.
- the gate electrode can be configured to face the epitaxy layer via the field oxide film, and as a result, the capacitance between the gate and the source and between the gate and the drain can be reduced.
- the high-speed switching characteristics can be further improved.
- a first conductivity type drain region formed near the surface of the first conductivity type on-resistance reducing well
- the first conductive type well is in contact with the first conductive type well in the vicinity of the surface of the semiconductor substrate.
- the first conductivity type on-resistance reducing well is formed so as not to be in contact with the first conductivity type on-resistance reducing well, and the first conductivity type drain region is formed near the surface of the first conductivity type on-resistance reducing well. Since most of the current path between the drain region of the first conductivity type and the source region of the first conductivity type at the time of the on-state is a low-resistance first-conductivity-type on-resistance reducing gel, the gate resistance is low.
- the lateral short-channel DMOS according to the third embodiment of the present invention is a horizontal short-channel DMOS having low gate resistance and low on-resistance, and excellent in high-speed switching characteristics and current driving characteristics.
- the first conductive type impurity containing a higher concentration of the first conductive type impurity than the first conductive type well is used. Since the first conductivity type on-resistance reducing well is separately provided, the on-resistance at the time of on can be reduced without increasing the impurity concentration itself of the first conductivity type well. It does not degrade the breakdown voltage performance of the channel DMOS.
- the first conductivity type tool needs to be formed relatively deep from the surface of the semiconductor substrate in order to secure the breakdown voltage of the lateral short channel DMOS, while the first conductivity type tool for reducing the on-resistance is the first conductivity type tool. Since it only has to function as a current path from the drain region of the conductivity type to the source region of the first conductivity type, it may be formed relatively shallow from the surface of the semiconductor substrate. Therefore, the lateral spread when forming the first-conductivity-type on-resistance reducing well can be reduced, and as a result, the element area of the horizontal short-channel DMOS does not increase so much.
- the formation of the first conductivity type on-resistance reducing well allows the first conductive type to be connected to the PN junction formed by the second conductive type well and the first conductive type well at the time of reverse bias, thereby providing the first conductive type.
- the electric field strength on the surface of the semiconductor substrate does not increase and the breakdown voltage can be stabilized.
- the impurity concentration of the first conductivity type ON resistance lowering Ueru is, 1 X1 O + is a is number Zc m 3 or more, the first conductive the impurity concentration of Ueru type is preferably less than or equal l xl O + i? pieces / cm 3.
- the impurity concentration of said first conductivity type on resistance reduction for Ueru is more preferably 2x1 O + IS pieces ZCM 3 or more, further not more 5x1 O + IS pieces Zc m 3 or more preferable .
- the impurity concentration of the first conductivity type well is more preferably 5 ⁇ 10 + is / cm 3 or less, further preferably 2 ⁇ 1 + Zcm 3 or less.
- a space between the second conductivity type well and the first conductivity type drain region is provided in the vicinity of the surface of the first conductivity type well. It is preferable that a diffusion layer of the second conductivity type in a floating state is formed in the region so as not to be in contact with the second conductivity type well.
- the electric field intensity at the time of reverse bias in the vicinity of the region where the second conductivity type diffusion layer is formed is reduced, and the breakdown voltage can be further stabilized.
- the current between the drain region of the first conductivity type and the source region of the first conductivity type at the time of turning on is a part deeper than the diffusion layer of the second conductivity type, avoiding the diffusion layer of the second conductivity type. (The first conductivity type well), so that the on-resistance does not increase.
- the impurity concentration of the diffusion layer of the second conductivity type is more preferably in the range of 3 ⁇ 10 + is / cm3 to 5xl0 + 18 Zcm3, and 1 ⁇ 10 + 17 number Z cm 3 ⁇ it is further favorable preferable in the range of 1 x1 0 + 18 pieces Bruno cm 3.
- the second conductivity type diffusion layer is formed so as not to be in contact with the first conductivity type on-resistance reducing well. .
- the gate electrode in a region from the second conductivity type diffusion layer to the first conductivity type drain region, is formed through a field oxide film. Preferably, it faces the semiconductor substrate.
- the lateral short-channel DMOS of the present invention has a surface of a second conductivity type well including a channel forming region, as is clear from the lateral short-channel DMOS according to the first to third aspects.
- the current flowing between the first conductivity type source region and the first conductivity type drain region formed in the vicinity is changed by the current flowing from the first conductivity type source region to the first conductivity type drain region.
- the first conductivity type drain region is C is a lateral short-channel DMOS formed near the surface of the first conductivity type on-resistance reduction well formed so as not to contact the mold well.
- silicon can be preferably used as the semiconductor substrate.
- the gate electrode As a material for the gate electrode, polysilicon, tungsten silicide, molybdenum silicide, tungsten, molybdenum, copper, aluminum, or the like can be preferably used. As the metal for reducing the gate resistance, tungsten, molybdenum, copper, aluminum or the like can be preferably used.
- the second conductivity type In the horizontal short channel DMOS of the present invention, the second conductivity type may be P-type and the first conductivity type may be N-type, or the second conductivity type may be N-type and the first conductivity type may be N-type. Can be P-type.
- the “method for manufacturing a lateral short-channel DMOS” according to the first embodiment of the present invention is a manufacturing method for manufacturing the “horizontal short-channel DMOS” according to the first embodiment of the present invention,
- the ⁇ method for producing a horizontal short channel DMOS '' according to the second aspect of the present invention is a production method for producing the ⁇ horizontal short channel DMOS '' according to the second aspect of the present invention
- a field oxide film having a predetermined opening is formed on the surface of the epitaxial layer, and a gate insulating film is formed by thermal oxidation in the opening of the field oxide film.
- the “method for manufacturing a horizontal short-channel DMOS” according to the third aspect of the present invention is a manufacturing method for manufacturing the “horizontal short-channel DMOS” according to the third aspect of the present invention
- a field oxide film having a predetermined opening is formed on one surface of the semiconductor substrate, and a gate insulating film is formed on the opening of the field oxide film by thermal oxidation.
- a semiconductor device includes the lateral short-channel DMOS according to any one of the first to third aspects.
- the semiconductor device includes a lateral short-channel DMOS having a low gate resistance and a low on-resistance and having excellent high-speed switching characteristics and current driving characteristics.
- the semiconductor device of the present invention can further include a logic circuit.
- the semiconductor device of the present invention includes a lateral short-channel DMOS having low gate resistance and low on-resistance, and excellent in high-speed switching characteristics and current driving characteristics, and a logic circuit for controlling the same. Therefore, the semiconductor device becomes an excellent power control semiconductor device.
- the horizontal short-channel DMOS according to the second aspect described above it is particularly preferable to employ the horizontal short-channel DMOS according to the second aspect described above as the horizontal short-channel DMOS.
- the lateral short-channel DMOS having the first conductivity type formed inside the epitaxial layer can be used to reduce the breakdown voltage of the horizontal short channel DMOS. It can be controlled by the density.
- the impurity concentration of the epitaxial layer can be adjusted to a concentration suitable for the logic circuit (for example, lower than that of the first conductivity type), and a semiconductor device for power control having excellent characteristics can be obtained.
- FIG. 1A is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 1A.
- FIG. 1B is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 1B.
- FIG. 1C is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 1C.
- FIG. 1D is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 1D.
- FIG. 1E is a cross-sectional view of the horizontal short channel DMOS according to Embodiment 1E.
- FIG. 2A is a cross-sectional view of a horizontal short channel DMOS according to Embodiment 2A.
- FIG. 2B is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 2B.
- FIG. 2C is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 2C.
- FIG. 2D is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 2D.
- FIG. 2E is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 2E.
- FIG. 2F is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 2F.
- FIG. 3A is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 3A.
- FIG. 3B is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 3B.
- FIG. 3C is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 3C.
- FIG. 3D is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 3D.
- FIG. 3E is a cross-sectional view of the horizontal short-channel DMOS according to the embodiment 3E.
- FIG. 4A is a plan view of a horizontal short-channel DMOS according to Embodiment 3D.
- FIG. 4B is a plan view of a horizontal short-channel DMOS according to Embodiment 3D.
- FIG. 5 is a cross-sectional view of a horizontal short channel DMOS according to Embodiment 3D.
- FIG. 6 is a cross-sectional view of a semiconductor device in which a horizontal short-channel DMOS according to Embodiment 2E and other elements are integrated.
- FIGS. 7A to 7F are diagrams illustrating the manufacturing process of the horizontal short-channel DMOS according to the fourth embodiment.
- FIGS. 8a to 8g are views showing the steps of manufacturing the horizontal short-channel DMOS according to the fifth embodiment.
- 9a to 9g are diagrams showing the steps of manufacturing the horizontal short-channel DMOS according to the sixth embodiment.
- FIG. 10 is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 7E.
- FIG. 1A is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 8E.
- FIG. 11B is a cross-sectional view of a lateral short-channel DMOS according to Embodiment 8F.
- FIG. 12 is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 9E.
- FIG. 13 is a cross-sectional view of a conventional horizontal short-channel DMOS.
- FIG. 14 is a cross-sectional view of a conventional horizontal short channel DMOS.
- FIG. 1A is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 1A.
- the horizontal short-channel DMOS 1OA according to the embodiment 1A is the horizontal short-channel DMOS 1 according to the first embodiment of the present invention.
- a P ⁇ type semiconductor substrate semiconductor substrate
- An N-type epitaxy layer first conductivity type epitaxy layer 110 is formed on the surface of 1 ⁇ 8.
- a P-type well (second conductive type well) 114 including a channel forming region C is formed.
- An N + type source region (source region of the first conductivity type) 116 is formed near the surface.
- an N-type resistor for reducing the on-resistance (a first-conductivity-type on-resistance reducing tool) so as not to contact the P-type module 114.
- An N + -type drain region (a first conductivity type drain region) 118 is formed near the surface of the on-resistance reducing N-type well 134.
- a polysilicon gate electrode 122 is formed at least above the channel forming region C in the region from the N + type source region 116 to the N + type drain region 118 via the gate insulating film 120. Have been.
- the polysilicon gate electrode 122 is connected to the gate resistance reducing metal layer 130.
- An element isolation region 140 is provided on the right side of the N + type drain region 118.
- an N-type for reducing the on-resistance is provided near the surface of the N-type epitaxial layer 110.
- the n-type drain region 118 is formed near the surface of the on-resistance reducing n-type well 134 so that the p-type well 134 is formed so as not to contact the p-type well 114.
- Most of the current path from the N + type drain region 118 to the N + type source region 116 is a low resistance N-type resistor 134 for reducing the on-resistance, and the gate length is long to reduce the gate resistance. Even so, the on-resistance can be sufficiently reduced as a whole. Therefore, the lateral short-channel DMOS 1OA according to Embodiment 1A has a low gate resistance and low on-resistance, and is excellent in high-speed switching characteristics and current driving characteristics.
- an N-type well 134 for reducing the on-resistance containing a higher concentration of N-type impurities than the N-type epitaxial layer 110 is separately provided. Since it is provided, the resistance at the time of ON can be reduced without increasing the impurity concentration itself of the N-type epitaxial layer 110, and the withstand voltage performance of the horizontal short-channel DMOS can be reduced. Absent.
- the depth of the P-type well 114 is, for example, 1.5 / m, and the depth of the N + type source region 116 is, for example, 0.
- the depth of the N + -type drain region 118 is also, for example, 0.3 ⁇ , and the depth of the on-resistance-reducing channel 134 is, for example, 2 m.
- the impurity concentration of the on-resistance reducing N-type well 134 is, for example, 1 ⁇ 10 + 1 9 Z c Hi 3
- the impurity concentration of 10 is, for example, IX 10 + 16 Z cm3.
- FIG. 1B is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 1B.
- the horizontal short channel DMO S 10B according to the embodiment 1B has a force similar to the horizontal short channel DMO S 10A according to the embodiment 1A.
- a floating state is provided in a region between the P-type cell 114 and the N + type drain region 118 so as not to contact the P-type well 114.
- the difference is that a P-type diffusion layer (diffusion layer of the second conductivity type) 138 is formed.
- the horizontal short-channel DMOS 10B according to the embodiment 1B the following effects can be obtained in addition to the effects of the horizontal short-channel DMOS 10A according to the embodiment 1A. That is, the electric field strength at the time of reverse bias in the vicinity of the region where the P-type diffusion layer 138 is formed is reduced, and the withstand voltage can be further stabilized.
- the current from the N + type drain region 118 to the N + type source region 116 at the time of turning on is a part deeper than the P-type diffusion layer 138 avoiding the P-type diffusion layer 138 (N ⁇ type). Since it flows through the epitaxial layer 110), the provision of the P-type diffusion layer 138 does not increase the on-resistance.
- the impurity concentration of the P-type diffusion layer 138 is, for example, 3 ⁇ I 0 +17 Zc ms.
- FIG. 1C is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 1C.
- the lateral short channel DMO S 10C according to the embodiment 1C has a structure very similar to the lateral short channel DMO S 10B according to the embodiment 1B, but the P-type diffusion layer 1 38 However, they differ in that they are formed so as not to contact the N-type well 134 for reducing the on-resistance.
- the horizontal short channel DMOS 10C according to Embodiment 1C For example, in addition to the effects of the horizontal short-channel DMOS 1 OB according to Embodiment 1B, the following effects can be obtained. That is, since the P-type diffusion layer 138 which is not biased is configured so as not to be in contact with the N-type well 134 for reducing the on-resistance, it is possible to suppress a decrease in withstand voltage and an increase in leak current as much as possible.
- FIG. 1D is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 1D.
- the horizontal short-channel DMO S 10D according to Embodiment 1D has a structure very similar to the horizontal short-channel DMO S 10B according to Embodiment 1B, but as shown in FIG. 1D.
- the polysilicon gate electrode 122 faces the N ⁇ -type epitaxial layer 110 via the field oxide film 130. It is different in that it is.
- the horizontal short-channel DMOS 10D according to Embodiment 1D the following effects are obtained in addition to the effects of the horizontal short-channel DMOS 10OB according to Embodiment 1B. That is, the capacitance between the gate and the source and between the gate and the drain can be reduced, and the high-speed switching characteristics can be further improved. This is because the electric field intensity at the time of reverse bias in the vicinity of the region where the P-type diffusion layer 13 8 is formed is relaxed, so that the region from the P-type diffusion layer 138 to the N + type This is because the polysilicon gate electrode 122 can be configured to face the N-type epitaxial layer 110 via the field oxide film 136.
- FIG. 1E is a cross-sectional view of the horizontal short-channel DMOS according to the embodiment 1E.
- the horizontal short-channel DMOS 10E according to the embodiment 1E has a structure very similar to the horizontal short-channel DMO S10C according to the embodiment 1C, but as shown in FIG.
- the polysilicon gate electrode 122 faces the N ⁇ type epitaxial layer 110 via the field oxide film 136.
- the horizontal short channel DMOS 10E according to the embodiment 1E the following effects are obtained in addition to the effects of the horizontal short channel DMOS 10C according to the embodiment 1C. That is, the capacitance between the gate and the source and between the gate and the drain can be reduced, and the high-speed switching characteristics can be further improved. This is because the electric field intensity at the time of reverse bias in the vicinity of the region where the P-type diffusion layer 138 is formed is reduced, so that the region from the P-type diffusion layer 138 to the N + type drain region 118 is formed. This is because the polysilicon gate electrode 122 can be configured to face the N-type epitaxial layer 110 via the thick field oxide film 136.
- FIG. 2A is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 2A.
- the horizontal short-channel DMOS 2 OA according to Embodiment 2A is a horizontal short-channel DMOS according to the second aspect of the present invention, and as shown in FIG. 2A, a P-type semiconductor substrate (semiconductor substrate).
- An N-type epitaxy layer (epitaxial layer) 210 is formed on the surface of 208, and an N-type epitaxy layer (first conductivity type well) is formed near the surface of the N-type epitaxy layer 210. 2 1 2 is formed.
- N-type A P-type module (a second conductivity type well) 214 including a cell formation region C is formed, and an N + type source region (a first conductivity type source region) is formed near the surface of the P-type transistor 214. 2) 16 are formed.
- An N + -type drain region (a first conductivity type drain region) 218 is formed near the surface of the on-resistance reducing N-type well 234.
- the polysilicon gate electrode 2 2 2 is formed.
- the polysilicon gate electrode 222 is connected to the gate resistance reducing metal layer 230.
- an element isolation region 240 is provided on the right side of the N + type drain region 218.
- the N-type well 2 34 for reducing the on-resistance is provided near the surface of the N-type epitaxial layer 210.
- the N + -type drain region 218 is formed near the surface of the N-type drain region 234 for reducing the on-resistance.
- Most of the current path from 18 to the N + -type source region 2 16 is a low-resistance N-type well 2 34 for reducing on-resistance.
- the lateral short-channel DMOS 2OA according to the embodiment 2A is a lateral short-channel DMOS having low gate resistance and low on-resistance, and excellent in high-speed switching characteristics and current driving characteristics.
- the ON-resistance reducing N Since the mold module 234 is provided separately, the on-state resistance can be reduced without increasing the impurity concentration of the N-type mold 212, and the withstand voltage performance of the horizontal short-channel DMOS is improved. There is no lowering.
- the N-type epitaxial layer 2 10 has the N-type layer 2 12 formed therein, so that the horizontal short-channel DMO
- the breakdown voltage of the lateral short-channel DMOS can be controlled by the impurity concentration of the N-type layer 212.
- the impurity concentration of the N-type epitaxial layer 210 can be adjusted to a concentration suitable for another element (for example, a logic element) (for example, lower than that of the N-type layer 212).
- a logic element for example, lower than that of the N-type layer 212.
- the depth of the N-type plug 2 12 is, for example, 5 ⁇ m, and the depth of the P-type plug 2 14 is, for example, 1.5 m.
- the depth of the N + type source region 216 is, for example, 0.3 ⁇ m, and the depth of the N + type drain region 218 is, for example, 0.3 ⁇ m.
- the impurity concentration of the N-type well 234 for reducing the on-resistance is, for example, lxl 0 + W / cm 3 , and the N-type epitaxial layer 2 1
- the impurity concentration of 0 is, for example, 5 ⁇ 10 + 15 Zc m3
- the impurity concentration of the N ⁇ type filter 2 12 is, for example, 1 ⁇ 10 + 16 Zc ms.
- FIG. 2B is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 2B.
- the horizontal short-channel DMO S 20 B according to Embodiment 2B has a structure very similar to the horizontal short-channel DMO S 2 OA according to Embodiment 2A.
- a region between the P-type well 2 14 and the N + type drain region 2 18 is in contact with the P-type well 2 14.
- the difference is that a P-type diffusion layer (diffusion layer of the second conductivity type) 238 is formed so as not to be disturbed.
- the horizontal short-channel DMOS 20B according to the embodiment 2B the following effects can be obtained in addition to the effects of the horizontal short-channel DMOS 2OA according to the embodiment 2A. That is, the electric field intensity at the time of reverse bias in the vicinity of the region where the P-type diffusion layer 238 is formed is reduced, and the withstand voltage can be further stabilized.
- the current from the N + -type drain region 218 to the N + -type source region 216 at the time of the ON is a portion deeper than the P-type diffusion layer 238 avoiding the P-type diffusion layer 238 (N Since it flows through the mold layer 212), the provision of the P′-type diffusion layer 238 does not increase the on-resistance.
- the impurity concentration of the P-type diffusion layer 238 is, for example, 3 XI 0 + 17 / cm 3.
- FIG. 2C is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 2C.
- the horizontal short-channel DMO S 20C according to Embodiment 2C has a structure very similar to the horizontal short-channel DMO S 20B according to Embodiment 2B, but the P-type diffusion layer 238 has an on-resistance. It differs in that it is formed so as not to contact the N-type well 234 for reduction.
- the configuration is such that the P-type diffusion layer 238 that is not biased does not come into contact with the N-type Therefore, it is possible to suppress a decrease in breakdown voltage and an increase in leak current as much as possible.
- FIG. 2D is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 2D.
- the horizontal short channel DMO S 20D according to the embodiment 2D has a structure very similar to the horizontal short channel DMO S 20B according to the embodiment 2B, but as shown in FIG.
- the polysilicon gate electrode 22 2 is opposed to the N ⁇ type epitaxial layer 2 10 via the vial oxide film 2 36.
- the horizontal short-channel DMOS 20D according to Embodiment 2D the following effects can be obtained in addition to the effects of the horizontal short-channel DMOS 20B according to Embodiment 2B. That is, the capacitance between the gate and the source and between the gate and the drain can be reduced, and the high-speed switching characteristics can be further improved. This is because the electric field strength at the time of reverse bias in the vicinity of the region where the P-type diffusion layer 238 is formed is relaxed, so that the region extending from the P-type diffusion layer 238 to the N + type drain region 2 18 This is because the polysilicon gate electrode 222 can be configured to face the N ⁇ type epitaxial layer 210 via the thick field oxide film 236.
- FIG. 2E is a cross-sectional view of the lateral short-channel DMOS according to Embodiment 2E.
- the horizontal short channel DMO S 20E according to the embodiment 2E has a structure very similar to the horizontal short channel DMO S 20C according to the embodiment 2C.
- the polysilicon gate electrode 222 is connected to the N-type epitaxial layer via the field oxide film 236. They differ in that they face 2 10.
- the horizontal short channel DMOS 20E according to the embodiment 2E the following effects can be obtained in addition to the effects of the horizontal short channel DMOS 20C according to the embodiment 2C. That is, the capacitance between the gate and the source and between the gate and the drain can be reduced, and the high-speed switching characteristics can be further improved. This is because the electric field strength at the time of reverse bias in the vicinity of the region where the P-type diffusion layer 238 is formed is reduced, so that the region from the P-type diffusion layer 238 to the N + type drain region 218 This is because the polysilicon gate electrode 222 can be configured to face the N1 type epitaxial layer 210 via the thick field oxide film 236.
- FIG. 2F is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 2F.
- the horizontal short channel DMO S 20F according to the embodiment 2F has a structure very similar to the horizontal short channel DMO S 20E according to the embodiment 2E, but as shown in FIG. The difference is that the P-type epitaxy layer 211 is formed on the surface of the semiconductor substrate 208 of the type, not the N-type epitaxy layer 210.
- the P-type epitaxial layer 211 is formed on the surface of the P-type semiconductor substrate 208.
- the case of the horizontal short-channel DMOS 20E according to the embodiment 2E is used.
- an N-type layer 2 12 is formed, and near the surface of the N-type hole 2 12, a P-type layer 214 including a channel forming region C is formed.
- An N + type source region 216 is formed near the surface of 214.
- the P-type epitaxial layer 2 11 In the vicinity of the surface of the P-type epitaxial layer 2 11, as in the case of the horizontal short channel DMOS 20 E according to the embodiment 2E, the P-type epitaxial layer 2 11 An N-type well 234 for reducing on-resistance is formed, and an N + type drain region 218 is formed near the surface of the N-type well 234 for reducing on-resistance.
- the horizontal short channel DMOS 20F according to Embodiment 2F has the same effect as the horizontal short channel DMOS 20E according to Embodiment 2E.
- FIG. 3A is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 3A.
- the lateral short-channel DMOS 3 OA according to Embodiment 3A is the lateral short-channel DMOS according to the third embodiment of the present invention, and as shown in FIG. 3A, a P-type semiconductor substrate (semiconductor substrate) 3
- An N-type well (a first conductivity type well) 312 is formed near the surface of 10.
- a P-type pellet (second conductivity type pellet) 314 including the channel forming region C is formed, and near the surface of the P-type pellet 314. Is formed with an N + type source region (source region of the first conductivity type) 3 16.
- an N-type well for reducing on-resistance (a first conductivity type on-resistance reducing well) 334 is in contact with the N-type well 312. In addition, it is formed so as not to be in contact with the P-type pellet 314.
- An N + type drain region (a drain region of the first conductivity type) 318 is formed near the surface of the N-type resistor 334 for reducing on-resistance. ing.
- the polysilicon gate electrode 3 2 2 is formed at least above the channel formation region C through the gate insulating film 3 2 0 in the region from the N + type source region 3 16 to the N + type drain region 3 18.
- This polysilicon gate electrode 3222 is connected to a gate resistance reducing metal layer 330.
- an N-type gel 3334 for reducing the on-resistance is provided near the surface of the P- type semiconductor substrate 310.
- the N-type drain region 3 1 is formed so as to be in contact with the N-type transistor 3 12 and not to be in contact with the P-type filter 3 14.
- Most of the current path from the N + -type drain region 318 to the N + -type source region 316 at the time of ON is low because the resistance is low. Thus, even if the gate length is increased to reduce the gate resistance, the on-resistance can be sufficiently reduced as a whole.
- the lateral short channel DMOS 30A according to Embodiment 3A is a horizontal short channel DMOS having low gate resistance and low on-resistance and excellent in high-speed switching characteristics and current driving characteristics.
- an N-type resistor 334 for reducing the on-resistance containing an N-type impurity having a higher concentration than the N-type resistor 3 12 is separately provided. Therefore, the on-state resistance can be reduced without increasing the impurity concentration of the N-type well 312, and the breakdown voltage performance of the lateral short-channel DMOS is not reduced.
- the N-type transistor 312 needs to be formed relatively deep from the surface of the P-type semiconductor substrate 310 in order to secure the breakdown voltage of the lateral short-channel DMOS.
- the N-type well 3 3 4 for reducing the on-resistance has the N + -type source from the N + -type drain region 3 18 Since it is only necessary to function as a current path to the region 3 16, it is only necessary that the P-type semiconductor substrate 3 10 be formed relatively shallow from the surface. For this reason, the lateral spread when forming the N-type well 334 for reducing the on-resistance can be reduced, and as a result, the element area of the horizontal short-channel DMOS does not increase so much.
- the depth of the N-type plug 312 is, for example, 5 ⁇ m
- the depth of the P-type plug 314 is, for example, 1.5 ⁇ .
- the depth of the ⁇ + type source region 316 is, for example, 0.3 ⁇
- the depth of the N + type drain region 318 is, for example, 0.3 ⁇ m.
- the depth of 34 is, for example, 2 ⁇ m.
- the impurity concentration of the N-type well 334 for reducing the on-resistance is, for example, 1 ⁇ 10 + 19 m3, and the impurity concentration of the N-type well 3 12 Is, for example, 1 ⁇ 10 + 16 / cm 3 .
- FIG. 3B is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 3B.
- the horizontal short channel DM OS 30 B according to Embodiment 3B has a structure very similar to the horizontal short channel DMOS 3 OA according to Embodiment 3A, but as shown in FIG.
- a region between the P-type well 314 and the N + -type drain region 318 is provided with a P-type diffusion layer (the The difference is that a 338 is formed.
- the horizontal short-channel DMOS 30B according to Embodiment 3B the following effects can be obtained in addition to the effects of the horizontal short-channel DMOS 30A according to Embodiment 3A. That is, the P-type diffusion layer 338 is formed. The electric field strength at the time of reverse bias in the vicinity of the region which has been reduced is alleviated, and the withstand voltage can be further stabilized.
- the current from the N + -type drain region 318 to the N + -type source region 316 at the time of ON is a portion deeper than the P-type diffusion layer 338 avoiding the P-type diffusion layer 338 (N Since it flows through the mold well 3 1 2), there is no increase in on-resistance.
- FIG. 3C is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 3C.
- the horizontal short channel DMO S 30 C according to the embodiment 3C has a structure very similar to the horizontal short channel DMO S 30 B according to the embodiment 3B, but as shown in FIG. Diffusion layer 338 is different in that it is formed so as not to contact N-type well 334 for reducing on-resistance.
- the horizontal short channel DMOS 30C according to Embodiment 3C the following effects are obtained in addition to the effects of the horizontal short channel DMOS 30B according to Embodiment 3B. That is, since the P-type diffusion layer 338 which is not biased is configured so as not to be in contact with the N-type well 334 for reducing the on-resistance, it is possible to suppress the reduction of the breakdown voltage and the increase of the leak current as much as possible.
- FIG. 3D is a cross-sectional view of the horizontal short-channel DMOS according to Embodiment 3D.
- the horizontal short channel DMO S 30D according to the embodiment 3D has a structure very similar to the horizontal short channel DMO S 30B according to the embodiment 3B, but as shown in FIG.
- the polysilicon gate electrode 322 is a field oxide film. This is different in that it faces the P-type semiconductor substrate 310 through the layer 33.
- the horizontal short channel DMOS 30D according to the embodiment 3D the following effects are obtained in addition to the effects of the horizontal short channel DMOS 30B according to the embodiment 3B. That is, the capacitance between the gate and the source and between the gate and the drain can be reduced, and the high-speed switching characteristics can be further improved. This is because the electric field strength at the time of reverse bias in the vicinity of the region where the P-type diffusion layer 338 is formed is relaxed, and therefore, in the region from the P-type diffusion layer 338 to the N + type drain region 318, This is because the polysilicon gate electrode 322 can be configured to face the P-type semiconductor substrate 310 via the thick field oxide film 336.
- FIG. 3E is a cross-sectional view of the horizontal short-channel DMOS according to the embodiment 3E.
- the horizontal short-channel DMOS 3 OE according to Embodiment 3E has a structure very similar to the horizontal short-channel DMO S 30C according to Embodiment 3C, but as shown in FIG. The difference is that the polysilicon gate electrode 322 is opposed to the P- type semiconductor substrate 310 via the field oxide film 336 in a region from the layer 338 to the N + type drain region 318. . .
- the horizontal short channel DMOS 30E according to Embodiment 3E the following effects are obtained in addition to the effects of the horizontal short channel DMOS 30C according to Embodiment 3C. That is, the capacitance between the gate and the source and between the gate and the drain can be reduced, and the high-speed switching characteristics can be further improved. This is because a P-type diffusion layer 338 is formed In the region from the P-type diffusion layer 338 to the N + -type drain region 318, the polysilicon is reduced via the thick field oxide This is because the gate electrode 322 can be configured to face the P- type semiconductor substrate 310.
- FIGS. 4A and 4B are plan views of the horizontal short channel DMOS 30D according to Embodiment 3D.
- FIG. 4A is a plan view of the surface of the P— type semiconductor substrate and the polysilicon gate electrode 322, and
- FIG. 4B is a diagram showing the source electrode 326, the drain electrode 328, and the metal layer 3 for reducing the gate resistance. It is the one with 30. As shown in FIGS.
- this horizontal short-channel DMOS 30D has an N + -type source region 316 located at the center and an N + -type drain region located at the outer periphery. It has a structure surrounded by 318. Further, it has a structure in which a polysilicon gate electrode 322 is arranged between the N + type source region 316 and the N + type drain region 318. Note that “S” in FIG. 4A represents a P-type well. Also, in FIGS. 4A and 4B, the N-type resistor 334 for reducing on-resistance and the P-type diffusion layer 338 are omitted. FIG.
- FIG. 5 is a cross-sectional view of a horizontal short channel DMOS 3 QD according to Embodiment 3D. The wider area in FIG. 3D is shown.
- the lateral short channel DMOS 30D has an outer periphery surrounded by an N + type drain region 318, a polysilicon gate electrode 322 is arranged inside the N + type drain region 318, and a N + c Therefore the source region 3 1 6 has an arrangement structure, the lateral short-channel DMO S 30 D are shown in FIGS. 4 and 5 Thus, a horizontal short-channel DMOS with a large gate width and excellent current drive characteristics is obtained.
- FIG. 6 is a cross-sectional view of a semiconductor device in which a horizontal short-channel DMOS 20E and other elements are integrated.
- this semiconductor device 28 has an N-channel horizontal short-channel DMO S 20 E, a P-channel horizontal MOS 21, an N-channel MOS transistor 23, a P-channel MOS transistor 22, and an NPN bipolar transistor. It has a transistor 25 and a PNP bipolar transistor 24.
- Each of these elements is formed in an N_ type epitaxy layer 210 formed on the surface of a P ⁇ type semiconductor substrate.
- the breakdown voltage of the horizontal short-channel DMOS 20E can be controlled by the impurity concentration of the N-type well 212.
- the impurity concentration of the N ⁇ type epitaxial layer 210 is adjusted to a concentration suitable for another element (eg, the N-channel MOS transistor 23 and the P-channel MOS transistor 22) (eg, the N ⁇ type Therefore, a semiconductor device having excellent characteristics can be obtained. .
- FIGS. 7A to 7F are diagrams illustrating respective manufacturing steps in the “method for manufacturing a horizontal short channel DMOS” according to the fourth embodiment.
- the “method for manufacturing a horizontal short channel DMOS” according to the fourth embodiment is the same as the “horizontal short channel” This is a manufacturing method for manufacturing “Numerical DMO S 10D”.
- a “horizontal short-channel DMOS manufacturing method” according to the fourth embodiment will be described with reference to FIGS. 7A to 7F.
- the “method for manufacturing a horizontal short-channel DMOS” according to the fourth embodiment includes the following (a) first step to (f) sixth step, as shown in FIGS. 7A to 7F. .
- a semiconductor substrate having an N- type epitaxial layer 110 formed on the surface of a semiconductor substrate 108 made of a p-type silicon substrate is prepared.
- the epitaxy layer 110 one having an impurity concentration of, for example, 1 XI0 + 16 / cm 3 is used.
- a first ion implantation mask 15 having a predetermined opening is formed on the surface of the N ⁇ type epitaxial layer 110, and the first ion implantation mask 15 is formed.
- phosphorus ions are implanted as N-type impurities to form an N-type resistor 134 for reducing on-resistance.
- Impurity concentration at this is, for example, lxl 0 + 1 9 pieces / / 0111 3.
- a second ion implantation mask 154 having a predetermined opening is formed on the surface of the N-type epitaxial layer 110. Then, using the second ion implantation mask 154 as a mask, for example, boron ion is implanted as a P-type impurity to form a P-type transistor 114 so as not to be in contact with the N-type resistor 134 for reducing the on-resistance. Then, a P-type diffusion layer 138 is formed in a region of the N-type resistor 134 for reducing the on-resistance that faces the P-type well 114. The impurity concentration at this time is, for example, 3 ⁇ 10 + 17 Z cm3. In addition, P type 14 and the P-type diffusion layer 138 can be formed in different steps.
- a field oxide film 136 having a predetermined opening is formed on the surface of the N ⁇ type epitaxial layer 110.
- a gate insulating film 120 is formed in the opening 36 by thermal oxidation.
- a polysilicon gate electrode 122 is formed in a predetermined region on the upper surfaces of the gate insulating film 120 and the field oxide film 136.
- the resist 156 After forming a resist 156, the resist 156, the polysilicon gate electrode 122, and the field oxide film 136 are used as a mask, and arsenic ions, for example, are implanted as N-type impurities into the N + type. A source region 116 and an N + type drain region 118 are formed.
- an interlayer insulating film 124 is formed. After that, a predetermined contact hole is opened in the interlayer insulating film 124, and then a metal layer is formed. Thereafter, patterning of the metal layer is performed to form a source electrode 126, a drain electrode 128, and a gate resistance reducing metal layer 130. Thereafter, the semiconductor substrate 108 is connected to the ground 132 to form a horizontal short channel DMOS 10D.
- the excellent “horizontal short-channel DMOS 10” according to the first embodiment is manufactured by a relatively easy method. D ”can be manufactured.
- the N + -type drain region 11 1 8 region that becomes N + type drain region 1 18
- the field oxide film 136 may be opened in the region up to.
- a P-type is used as the second ion implantation mask 154. It is only necessary to use a mask in which a portion corresponding to the diffusion layer 138 is not opened.
- the second step to (c) the third step may be formed so as not to contact the well 134.
- the (b) second step to (c) the third step A P-type diffusion layer 138 is formed so as not to be in contact with the hole 134.
- a field oxidation is performed in a region from the P-type diffusion layer 138 to the N + -type drain region 118. It is sufficient to open the membrane 13 6.
- FIGS. 8A to 8G are diagrams illustrating manufacturing steps in the “method for manufacturing a horizontal short-channel DMOS” according to the fifth embodiment.
- the “method for manufacturing a horizontal short-channel DMOS” according to the fifth embodiment is a method for manufacturing a “horizontal short-channel DMOS 20D” according to the second embodiment.
- the “method for manufacturing a lateral short-channel DMOS” according to the fifth embodiment will be described with reference to FIGS. 8A to 8G.
- the “method of manufacturing a horizontal short channel DMOS” according to the fifth embodiment includes the following (a) first step to (g) seventh step. Contains.
- a semiconductor substrate having an N-type epitaxial layer 210 formed on a surface of a semiconductor substrate 208 made of a P-type silicon substrate is prepared.
- the N ⁇ type epitaxial layer 210 one having an impurity concentration of, for example, 5 ⁇ 10 + 15 Z cm 3 is used.
- a first ion implantation mask 250 having a predetermined opening is formed on the surface of the N-type epitaxial layer 210, and the first ion implantation mask 250 is formed.
- phosphorus ions are implanted as N-type impurities into the N-type epitaxial layer 210 as a mask to form an N-type well 212.
- the impurity concentration at this time is, for example, 1 XI 0 + 16 / cm 3 .
- a second ion implantation mask 255 having a predetermined opening on the surface of the N-type epitaxial layer 210 is removed.
- N-type impurities for example, phosphorus ions are implanted at a higher concentration than in the second step, and the on-resistance is set so as to be in contact with the N ⁇ type well 2 12.
- the impurity concentration at this time is, for example, IX10 + 19 / cm3.
- a third ion implantation mask 254 having a predetermined opening is formed on the surface of the N-type epitaxial layer 210. Then, for example, boron ions are implanted as P-type impurities using the third ion implantation mask 255 as a mask, The P-type resistor 214 is formed so as not to be in contact with the N-type resistor 234 for reducing the on-resistance, and the area of the N-type resistor 234 for reducing the on-resistance facing the P-type resistor 214 Then, a P-type diffusion layer 238 is formed. At this time, the impurity concentration is, for example, 3 ⁇ 10 + 17 Zcm 3. The P-type well 2 14 and the P-type diffusion layer 238 can be formed in different steps.
- a field oxide film 236 having a predetermined opening is formed on the surface of the N ⁇ type epitaxial layer 210.
- a gate insulating film 220 is formed in the opening of the film 236 by thermal oxidation.
- a polysilicon gate electrode 222 is formed in a predetermined region on the upper surface of the gate insulating film 220 and the field oxide film 236.
- the resist 256 After forming the resist 256, the resist 256, the polysilicon gate electrode 222, and the field oxide film 236 are used as a mask to implant, for example, arsenic ions as N-type impurities.
- the N + -type source region 216 and the N + -type drain region 218 are formed.
- an interlayer insulating film 224 is formed. After that, a predetermined contact hole is opened in the interlayer insulating film 222, and then a metal layer is formed. Thereafter, pattern jung of the metal layer is performed to form a source electrode 226, a drain electrode 228, and a metal layer 230 for reducing gate resistance. After that, the semiconductor substrate 208 is connected to the ground 232 to form a horizontal short channel DMOS20D.
- the superior “horizontal horizontal DMSO Mold short channel DMO S 20D ” can be manufactured.
- the N-type drain region 218 is formed from the P-type diffusion layer 238.
- the field oxide film 236 may be opened in a region reaching the (N + type drain region 218) region.
- a P-type diffusion is used as the third ion implantation mask 255.
- a mask in which the portion corresponding to the layer 238 is not opened may be used.
- the (c) third step to (d) fourth step of the above-described manufacturing method may include the steps of:
- the P-type diffusion layer 238 may be formed so as not to contact the 234.
- a field oxide film 236 is formed in a region from the p-type diffusion layer 238 to the n + -type drain region 218. The opening may be made.
- the surface of the semiconductor substrate 208 made of a P-type silicon substrate is What is necessary is just to prepare a semiconductor substrate on which the type epitaxial layer 211 is formed.
- the P— type epitaxy layer 211 an impurity concentration of, for example, 5 ⁇ 10 + 15 / cm 3 is used.
- FIGS. 9A to 9G are diagrams showing the manufacturing steps in the “method for manufacturing a horizontal short channel DMOS” according to the sixth embodiment.
- the “method for manufacturing a horizontal short channel DMOS” according to the sixth embodiment is a method for manufacturing the “horizontal short channel DMOS 30D” according to the third embodiment.
- the “method for manufacturing a lateral short-channel DMOS” according to the sixth embodiment will be described with reference to FIGS. 9A to 9G.
- the “method for manufacturing a horizontal short-channel DMOS” according to the sixth embodiment includes the following (a) first step to (g) seventh step, as shown in FIGS. 9a to 9g. .
- a semiconductor substrate 310 made of a P-type silicon substrate is prepared.
- a first ion implantation mask 350 having a predetermined opening is formed on one surface of the semiconductor substrate 310, and the semiconductor is formed using the first ion implantation mask 350 as a mask.
- phosphorus ions are implanted into the substrate 310 as N-type impurities to form an N-type well 312.
- the impurity concentration at this time is, for example, 1 ⁇ 10 + 16 cm 3 .
- a second ion implantation mask 352 having a predetermined opening is formed on one surface of the semiconductor substrate 310, and the second ion implantation mask 350 is formed.
- the ion implantation mask 35 2 as a mask, for example, phosphorus ions are implanted as N-type impurities at a higher concentration than in the second step, and the N-type well 334 for reducing the on-resistance is brought into contact with the N-type layer 3 12.
- the impurity concentration at this time is, for example, lxl 0 + 19 / To cm 3.
- a third ion implantation mask 354 having a predetermined opening is formed on one surface of the semiconductor substrate 310.
- boron ions are implanted as P-type impurities to form a P-type transistor 314 so as not to contact the N-type well 334 for reducing the on-resistance, and to reduce the on-resistance.
- a P-type diffusion layer 338 is formed in a region of the N-type filter 334 facing the P-type filter 314.
- the impurity concentration at this time is, for example, 3 ⁇ 10 + 17 Zcms. It should be noted that the P-type filter 314 and the P-type diffusion layer 338 can be formed in different steps.
- a field oxide film 336 having a predetermined opening on one surface of the semiconductor substrate 310 is formed.
- a gate insulating film 320 is formed in the opening by thermal oxidation.
- a polysilicon gate electrode 322 is formed in a predetermined region on the upper surfaces of the gate insulating film 320 and the field oxide film 336.
- the resist 356, the polysilicon gate electrode 322, and the field oxide film 336 are used as a mask to implant, for example, arsenic ions as N-type impurities.
- An N + type source region 316 and an N + type drain region 318 are formed.
- an interlayer insulating film 324 is formed. Then, after activating the implanted impurities, an interlayer insulating film 324 is formed. Then, a predetermined contact hole is opened in the interlayer insulating film 324. After that, a metal layer is formed. Thereafter, pattern jung of the metal layer is performed to form a source electrode 326, a drain electrode 328, and a gate resistance reducing metal layer 330. Thereafter, the semiconductor substrate 3 10 is connected to the ground 3 32 to form a horizontal short channel DMOS 30D.
- an excellent “horizontal short-channel DMOS 30D” according to the third embodiment can be manufactured by a relatively easy method. Can be manufactured.
- the N + -type drain region 31 1 The field oxide film 336 may be opened in the region up to 8 (the region that becomes the N + type drain region 3 18).
- a P-type mask is used as the third ion implantation mask 354.
- a mask in which a portion corresponding to the diffusion layer 338 is not opened may be used.
- the (c) third step to (d) fourth step of the above-described manufacturing method may include the steps of:
- the P-type diffusion layer 338 may be formed so as not to contact the 334.
- the N-type well 3 for reducing the on-resistance is used in the (c) third step to (d) fourth step of the above manufacturing method.
- the P-type diffusion layer 338 is formed so as not to be in contact with 34.
- a field oxide film is formed in a region from the P-type diffusion layer 338 to the N + type drain region 318. 3 3 6 should be opened.
- FIG. 10 is a cross-sectional view of a horizontal short channel DMOS 40E according to Embodiment 7E.
- This lateral short channel DMOS 40E has the same conductivity type (except for the semiconductor substrate) in the lateral short channel DMSO 10E according to Embodiment 1E. Also in the horizontal short channel DMOS 40E, the effect obtained in the horizontal short channel DMOS 10E can be obtained similarly.
- a P-type resistor 434 for reducing the on-resistance containing a P-type impurity having a higher concentration than that of the P-type epitaxial layer 410 is separately provided, the impurity in the P-type epitaxial layer 410 is separately provided.
- the resistance at the time of ON can be reduced without increasing the concentration itself, and the breakdown voltage performance of the horizontal short-channel DMOS is not reduced.
- the N-type diffusion layer 438 is formed in the P-type epitaxial layer 410, the electric field strength at the time of reverse bias in the vicinity of the region where the N-type diffusion layer 438 is formed is alleviated.
- the withstand voltage can be stabilized. Note that the current from the P + type source region 416 to the P + type drain region 418 at the time of the ON is a part deeper than the N-type diffusion layer 438 (P— Since it flows through the epitaxial layer 4 10), the provision of the N-type diffusion layer 438 does not increase the on-resistance.
- the non-biased N-type diffusion layer 438 is a P-type 003/011884
- the P-type epitaxial layer 411 is formed via the field oxide film 336. Therefore, the capacitance between the gate and the source and between the gate and the drain are reduced, and the high-speed switching characteristics are further improved.
- FIG. 11A is a cross-sectional view of a horizontal short channel DMOS 50E according to embodiment 8E.
- This lateral short-channel DMOS 50E is the same as the lateral short-channel DMOS 20E according to Embodiment 2E except that the conductivity type (except for the semiconductor substrate) is reversed.
- the effect obtained in the horizontal short channel DMOS 20E can be similarly obtained. That is, most of the current path from the P + type source region 516 to the P + type drain region 518 at the time of ON is a low resistance P-type well 534 for reducing the on-resistance, so as to reduce the gate resistance. Even if the gate length becomes longer, the on-resistance can be sufficiently reduced as a whole. Therefore, a horizontal short-channel DMOS having low gate resistance and low on-resistance and excellent in high-speed switching characteristics and current driving characteristics is obtained.
- a P-type resistor 534 for reducing the on-resistance containing a P-type impurity having a higher concentration than that of the P-type resistor 511 is separately provided, the impurity concentration itself of the P-type resistor 512 is increased. Without this, the resistance at the time of ON can be reduced, and the withstand voltage performance of the horizontal short-channel DMOS does not decrease.
- a P-type well 5 12 is formed inside the P-type epitaxial layer 5 10.
- the withstand voltage of the horizontal short-channel DMOS can be increased by the impurity concentration of P-type II: 512 in semiconductor devices that integrate the horizontal short-channel DMOS and other elements (eg, logic elements). Be able to control.
- the impurity concentration of the P-type epitaxial layer 510 can be adjusted to a concentration (for example, lower than that of the P-type well 512) suitable for another element (for example, a logic element), resulting in excellent characteristics.
- Semiconductor device is a concentration (for example, lower than that of the P-type well 512) suitable for another element (for example, a logic element), resulting in excellent characteristics.
- the N-type diffusion layer 538 is formed in the P-type well 512, the electric field strength at the time of reverse bias in the vicinity of the region where the N-type diffusion layer 538 is formed is reduced, and the breakdown voltage is further stabilized. Can be achieved. Note that the current flowing to the P + type drain region 516 when the P + type drain region is turned on is a part deeper than the P type diffusion layer 538 avoiding the P type diffusion layer 538. Since it flows through the (P-type cell 5 1 2), the on-resistance cannot be increased by providing the N-type diffusion layer 538.
- non-biased N-type diffusion layer 538 is configured so as not to be in contact with the P-type well 534 for reducing the on-resistance, a decrease in withstand voltage and an increase in leakage current can be suppressed as much as possible. .
- the polysilicon gate electrode 522 faces the P ⁇ -type epitaxial layer 510 via the field oxide film 536 in the region from the N-type diffusion layer 538 to the P + -type drain region 518.
- the capacitance between the gate and the source and between the gate and the drain are reduced, and the high-speed switching characteristics are further improved.
- FIG. 11B is a cross-sectional view of a horizontal short-channel DMOS according to Embodiment 8F.
- the horizontal short channel DMO S 50F according to the embodiment 8F has a structure very similar to the horizontal short channel DMO S 50E according to the embodiment 8E.
- what is formed on the surface of the P-type semiconductor substrate 508 is not the P-type epitaxy layer 501 but the N-type epitaxy layer 5111.
- the N-type epitaxial layer 5111 is formed on the surface of the P-type semiconductor substrate 508.
- a P-type filter 512 is formed near the surface of the N-type epitaxial layer 511 as in the case of the horizontal short channel DMOS 50E according to the embodiment 8E.
- An N-type well 514 including a channel forming region C is formed near the surface of the type well 511, and a P + type source region 516 is formed near the surface of the N-type well 514. It has been.
- the N-type epitaxial layer 511 should not be in contact with the N-type epitaxial layer 5114.
- An N-type resistor 534 for reducing on-resistance is formed, and a P + type drain region 518 is formed near the surface of the P-type resistor 534 for reducing on-resistance.
- the horizontal short-channel DMOS 50F according to Embodiment 8F has the same effect as the horizontal short-channel DMOS 50E according to Embodiment 8E.
- FIG. 12 is a cross-sectional view of a horizontal short channel DMOS 60E according to Embodiment 9E.
- This lateral short-channel DMOS 60E is obtained by reversing the conductivity type (except for the semiconductor substrate) in the lateral short-channel DMOS 30E according to Embodiment 3E. Also in the horizontal short channel DMOS 60E, the effect obtained in the horizontal short channel DMOS 30E can be obtained similarly.
- the P + type source region 6 16 Most of the current path to the region 6 18 is a low resistance P-type well 6 34 for reducing on-resistance, and the overall on-resistance is sufficiently reduced even if the gate length is increased to reduce the gate resistance can do. Accordingly, a lateral short-channel DMOS having low gate resistance and low on-resistance and excellent in high-speed switching characteristics and current driving characteristics is obtained.
- a separate P-type well 634 for reducing the on-resistance which contains a higher concentration of P-type impurities than the P-type well 6 12, is used. Without this, the on-state resistance can be reduced and the withstand voltage performance of the lateral short-channel DMOS does not decrease.
- the P-type well 6 12 needs to be formed relatively deep from the surface of the N-type semiconductor substrate 6 10 in order to secure the breakdown voltage of the lateral short-channel DMOS. Since the P-type well 634 for reduction may serve as a current path to the P + -type source region 6 16 and the P + -type drain region 6 18, the N-type semiconductor substrate It suffices if it is formed relatively shallow from the 6 10 surface. For this reason, the lateral spread when forming the P-type well 634 for reducing the on-resistance can be reduced, and as a result, the device area of the horizontal short-channel DMOS is not increased so much.
- the N-type diffusion layer 638 is formed in the P-type transistor 612, the electric field strength at the time of reverse bias in the vicinity of the region where the N-type diffusion layer 638 is formed is reduced, and the breakdown voltage is further stabilized. Can be achieved.
- the current from the P + type source region 616 to the P + type drain region 618 at the time of the ON is a part deeper than the N type diffusion layer 638 avoiding the N type diffusion layer 638. Since the current flows through the flow (P-type plug 6 1 2), the on-resistance does not increase.
- the non-biased N-type diffusion layer 638 is configured not to be in contact with the P-type well 634 for reducing the on-resistance, it is possible to minimize the decrease in breakdown voltage and the increase in leak current. it can.
- the polysilicon gate electrode 622 faces the P ⁇ -type semiconductor substrate 610 via the field oxide film 636 in a region from the N-type diffusion layer 638 to the P + -type drain region 618.
- the capacitance between the gate and the source and between the gate and the drain are reduced, and the high-speed switching characteristics are further improved.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2004546396A JPWO2004038805A1 (ja) | 2002-10-25 | 2003-09-18 | 横型短チャネルdmos及びその製造方法並びに半導体装置 |
US10/490,509 US7173308B2 (en) | 2002-10-25 | 2003-09-18 | Lateral short-channel DMOS, method for manufacturing same and semiconductor device |
EP03797945A EP1571711A4 (en) | 2002-10-25 | 2003-09-18 | LATERAL SHORT CHANNEL DMOS, MANUFACTURING METHOD AND SEMICONDUCTOR ELEMENT |
AU2003264483A AU2003264483A1 (en) | 2002-10-25 | 2003-09-18 | Lateral short-channel dmos, method for manufacturing same and semiconductor device |
CA002458992A CA2458992A1 (en) | 2002-10-25 | 2003-09-18 | Lateral short-channel dmos, method of manufacturing the same, and semiconductor device |
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JP2002310550 | 2002-10-25 | ||
JP2002-310550 | 2002-10-25 |
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WO2004038805A1 true WO2004038805A1 (ja) | 2004-05-06 |
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PCT/JP2003/011884 WO2004038805A1 (ja) | 2002-10-25 | 2003-09-18 | 横型短チャネルdmos及びその製造方法並びに半導体装置 |
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US (1) | US7173308B2 (ja) |
EP (1) | EP1571711A4 (ja) |
JP (1) | JPWO2004038805A1 (ja) |
KR (1) | KR20050052411A (ja) |
AU (1) | AU2003264483A1 (ja) |
CA (1) | CA2458992A1 (ja) |
WO (1) | WO2004038805A1 (ja) |
Cited By (2)
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JP2006032682A (ja) * | 2004-07-16 | 2006-02-02 | Shindengen Electric Mfg Co Ltd | 横型短チャネルdmos |
JP2006049582A (ja) * | 2004-08-04 | 2006-02-16 | Fuji Electric Device Technology Co Ltd | 半導体装置およびその製造方法 |
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US7635882B2 (en) * | 2004-08-11 | 2009-12-22 | Taiwan Semiconductor Manufacturing Company, Ltd. | Logic switch and circuits utilizing the switch |
JP2007049039A (ja) * | 2005-08-11 | 2007-02-22 | Toshiba Corp | 半導体装置 |
US20080042221A1 (en) * | 2006-08-15 | 2008-02-21 | Liming Tsau | High voltage transistor |
US7638857B2 (en) * | 2008-05-07 | 2009-12-29 | United Microelectronics Corp. | Structure of silicon controlled rectifier |
KR101578931B1 (ko) * | 2008-12-05 | 2015-12-21 | 주식회사 동부하이텍 | 반도체 소자 및 반도체 소자의 제조 방법 |
KR101941295B1 (ko) * | 2013-08-09 | 2019-01-23 | 매그나칩 반도체 유한회사 | 반도체 소자 |
US9245997B2 (en) * | 2013-08-09 | 2016-01-26 | Magnachip Semiconductor, Ltd. | Method of fabricating a LDMOS device having a first well depth less than a second well depth |
US11088031B2 (en) | 2014-11-19 | 2021-08-10 | Key Foundry Co., Ltd. | Semiconductor and method of fabricating the same |
US9431480B1 (en) * | 2015-03-27 | 2016-08-30 | Texas Instruments Incorporated | Diluted drift layer with variable stripe widths for power transistors |
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CN111668306B (zh) * | 2019-03-05 | 2023-03-21 | 旺宏电子股份有限公司 | 半导体元件 |
KR102291315B1 (ko) * | 2019-10-16 | 2021-08-18 | 주식회사 키 파운드리 | 반도체 소자 |
CN113013101A (zh) * | 2020-06-12 | 2021-06-22 | 上海积塔半导体有限公司 | 半导体器件的制备方法和半导体器件 |
CN113871456B (zh) * | 2021-10-09 | 2023-07-04 | 上海华虹宏力半导体制造有限公司 | Ldmos器件及其形成方法 |
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- 2003-09-18 EP EP03797945A patent/EP1571711A4/en not_active Withdrawn
- 2003-09-18 CA CA002458992A patent/CA2458992A1/en not_active Abandoned
- 2003-09-18 JP JP2004546396A patent/JPWO2004038805A1/ja not_active Withdrawn
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JP2006049582A (ja) * | 2004-08-04 | 2006-02-16 | Fuji Electric Device Technology Co Ltd | 半導体装置およびその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
KR20050052411A (ko) | 2005-06-02 |
US20040251493A1 (en) | 2004-12-16 |
JPWO2004038805A1 (ja) | 2006-02-23 |
CA2458992A1 (en) | 2004-04-25 |
EP1571711A1 (en) | 2005-09-07 |
AU2003264483A1 (en) | 2004-05-13 |
US7173308B2 (en) | 2007-02-06 |
EP1571711A4 (en) | 2008-07-09 |
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