WO2005122276A1 - 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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- WO2005122276A1 WO2005122276A1 PCT/JP2005/010237 JP2005010237W WO2005122276A1 WO 2005122276 A1 WO2005122276 A1 WO 2005122276A1 JP 2005010237 W JP2005010237 W JP 2005010237W WO 2005122276 A1 WO2005122276 A1 WO 2005122276A1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/785—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1203—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body the substrate comprising an insulating body on a semiconductor body, e.g. SOI
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66787—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a gate at the side of the channel
- H01L29/66795—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a gate at the side of the channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7842—Field effect transistors with field effect produced by an insulated gate means for exerting mechanical stress on the crystal lattice of the channel region, e.g. using a flexible substrate
Definitions
- the present invention relates to a semiconductor device and a method for manufacturing the same, and more particularly, to a semiconductor device whose mobility is improved by distortion and a method for manufacturing the same.
- a double-gate FET has a FinFET (Fin-type channel) with three possible configurations, depending on the arrangement of the source electrode, drain electrode, and two gate electrodes.
- FET FinFET
- FIG. 29 shows a schematic diagram of a general FinFET as described in Non-Patent Document 1.
- FinFET is fabricated on an SOI (Silicon on Insulator) layer on a Si substrate 1 and a buried oxide film 2.
- SOI Silicon on Insulator
- the SOI layer is provided with a pad for the source electrode 3 and a pad for the drain electrode 4, which are connected by fins 5.
- a hard mask 9 is provided on the upper surface of the fin 5 and below the gate electrode 6, and a gate insulating film 7 is formed between the side surface of the fin 5 and the gate electrode 6.
- FinFETs are not limited to double-gate FinFETs, and triple-gate FinFETs with channels above the fins 5 are also known, as shown in Fig. 30! 2: 2003 Symposium ⁇ On ⁇ VLSI Technology ⁇ Digest ⁇ Ob ⁇ Technical ⁇ ⁇ Ippaz, 2003, 133-134).
- the triple-gate FinFET differs from the double-gate FinFET in that a gate insulating film 7 formed by a hard mask 9 is formed above the fin 5 and below the gate electrode 6.
- Balta MOS devices use strained Si technology to improve channel mobility and increase channel speed in order to lower the power supply voltage!
- This technology modulates the Si band structure by applying stress to Si in the channel and changing the lattice spacing of Si.
- degeneracy is resolved, the electron occupancy of the double degenerate valley with a small effective mass is increased, and the interband scattering between the double degenerate valley and the quadruple degenerate valley is suppressed.
- Mobility improves. In the valence band, it is thought that the degeneracy is resolved and the mobility is improved by suppressing the interband scattering between the light and heavy hole bands and decreasing the effective mass.
- the strained Si technology is roughly classified into two methods depending on how strain is applied to the channel Si.
- the first method is to epitaxially grow a Si layer on a relaxed SiGe layer (Non-Patent Document 3: Applied Physics, Japan Society of Applied Physics, Vol. 72, No. 3, 2003, No. 220- As shown in Fig. 31 of Fig. 31 on page 290, first, an inclined SiGe buffer 17 and lattice relaxation Si Gel 8 are sequentially formed on a Si substrate 1.
- the composition of Ge in SiGe In the inclined SiGe buffer 17, the composition of Ge in SiGe The ratio x increases toward the upper surface of the substrate, and the 0% force can be increased to x% (X is usually 10 to 30 or 40)
- the composition ratio X of Ge in SiGe remains high Since the lattice constant of Ge is larger than the lattice constant of Si, the lattice relaxed Si Ge has a larger lattice constant than the lattice constant of Si. On top of this, the Si layer grown to lattice match has a lattice constant larger than that of Balta SU, and becomes strained Sil9.
- strained Si layer using the fabricating a MOS FET as shown in Figure 31 as the mobility is increased by distortion introduced in the channel.
- FIG. 32 there is a method in which a lattice relaxation SiGel 8 is provided on the buried oxide film 2 to form an SGO KSiGe on Insulator) structure, on which a Si layer is grown to form a strain Sil 9.
- a lattice relaxation SiGel 8 is provided on the buried oxide film 2 to form an SGO KSiGe on Insulator) structure, on which a Si layer is grown to form a strain Sil 9.
- the transition SiGe layer which causes strain to the channel Si layer, has many transitions and defects.
- the transition and the defect also propagate to the channel Si layer. There is. Therefore, when the first method is used, a single MOS transistor operates, but it is difficult to operate an integrated circuit. Even if it operates, it is difficult to secure the yield.
- the second method utilizes process distortion.
- a distortion caused by a cap layer STI (Shallow Trench Isolation), or the like is used (Non-Patent Document 4: International Electron Device Meeting Meeting Tech 'Digest, 2001, 433-436). page).
- STI Shallow Trench Isolation
- a nitride film is used as the cap layer 20, and strain is applied to Si in the channel by using the tension of the nitride film.
- the second method has a problem that it is difficult to control the amount of distortion to directly apply distortion to the channel. This is due to the structure that strains the channel region through the cap layer and the STI force that causes the strain and other materials that are far away from the channel region.
- An object of the present invention is to provide a semiconductor device in which strain is introduced by a novel structure to increase carrier mobility. It is another object of the present invention to provide a semiconductor device in which the occurrence of dislocations and defects is small and the amount of distortion is controlled. Another object is to provide a method for manufacturing such a semiconductor device.
- the present invention relates to the following matters.
- a semiconductor device characterized in that a current flows in a radial beam formed of a semiconductor.
- a semiconductor device having a plurality of FinFETs
- a method of manufacturing a semiconductor device in which an electric current flows through a radial beam formed of a semiconductor, wherein a straight beam having a double-supported beam structure formed of a semiconductor is formed with a gap under the straight beam. And filling the gap with a liquid, and drying the liquid to attach the center of the beam to the bottom of the gap to form a radiused beam.
- a first layer made of a semiconductor material constituting the beam and a first layer under the first layer are formed prior to the step of forming a straight beam having the doubly supported beam structure. And a step of preparing a substrate having a second layer having a material strength different from the etching rate, wherein the step of forming a straight beam having the double-ended beam structure includes etching at least a part of the second layer. 11. The method of manufacturing a semiconductor device according to the above item 9 or 10, wherein the method is a step of forming a gap in a part of a lower portion of the first layer by removing the gap.
- a method for producing a FinFET comprising: a step of forming a straight beam; a step of filling the gap with a liquid; and a step of drying the liquid and attaching a fin to the bottom of the gap to bend.
- a radius is used to apply a strain to a semiconductor layer.
- the beam is flexed, the beam is distorted in accordance with the radius. Since such a structure is different from the conventional method of introducing strain based on the lamination of semiconductor layers having different lattice constants, there is no occurrence of a transition or a defect based on a lower semiconductor layer. Therefore, it is possible to provide a semiconductor device which is improved in reliability and capable of high-speed operation with a high production yield.
- the structure has a structure in which the strain can be directly controlled by the radius, so that there is an advantage that the design of the semiconductor device becomes easy.
- a stinging phenomenon due to the surface tension of the liquid is used, so that the transfer or defect is less likely to occur. Good reliability and yield. Further, since the distortion can be easily controlled by the radius, there is an advantage that the design of the semiconductor device is facilitated.
- FIG. 1 is a diagram showing a first embodiment (a double-gate FinFET).
- FIG. 2 is a diagram showing a first embodiment (triple gate FinFET).
- FIG. 3 is a process diagram showing a structure in the course of manufacture according to the first embodiment (after forming fins and electrode pads).
- FIG. 4 is a process diagram showing a structure in the course of manufacture according to the first embodiment (after etching of a buried oxide film).
- FIG. 5 is a process diagram showing a structure in the course of manufacture according to the first embodiment (in a state of being immersed in a liquid).
- FIG. 6 is a process diagram showing a structure in the course of manufacture according to the first embodiment (after the liquid is dried)
- FIG. 7 is a process diagram showing a structure in the course of manufacture according to the first embodiment (after filling the space under the fin with an insulating film).
- FIG. 8 is a process diagram showing a structure in the course of manufacture according to the first embodiment (after removing a gate insulating film other than below a gate electrode).
- FIG. 9 is a process chart showing a structure in the course of manufacture according to the first embodiment (after ion implantation of an extension).
- FIG. 10 is a process diagram showing a structure in the course of manufacture according to the first embodiment (after formation of a sidewall).
- FIG. 11 is a view showing a second embodiment (a double-gate FinFET).
- ⁇ 12 ⁇ is a view showing a second embodiment (triple-gate FinFET).
- FIG. 13 is a process diagram showing a structure in the course of manufacture according to the second embodiment (after removing the gate insulating film other than below the gate electrode).
- FIG. 14 is a process diagram showing a structure in the course of manufacture according to the second embodiment (after extension ion implantation).
- FIG. 15 is a process diagram showing a structure in the course of manufacture according to the second embodiment (after formation of a sidewall).
- FIG. 16 is a diagram showing a third embodiment (double-gate FinFET).
- FIG. 17 shows a third embodiment (triple-gate FinFET).
- FIG. 18 is a process drawing showing a structure in the course of manufacture according to the third embodiment (after fin formation).
- FIG. 19 is a process diagram showing a structure in the course of manufacture according to the third embodiment (after CMP).
- FIG. 20 is a process diagram showing a structure in the course of manufacture according to the third embodiment (after forming electrode pads).
- FIG. 20 is a top view showing the fourth embodiment.
- FIG. 22 is a top view showing the fourth embodiment.
- FIG. 23 is a view showing a fifth embodiment (using a triple-gate FinFET and a slit contact).
- FIG. 24 is a diagram showing a fifth embodiment. (Triple gate FinFET).
- FIG. 25 is a view showing a sixth embodiment (planar type MOSFET).
- FIG. 26 is a diagram illustrating the first half of the manufacturing process of the sixth embodiment.
- FIG. 27 is a view illustrating a middle stage of the manufacturing process of the sixth embodiment.
- FIG. 28 is a diagram illustrating the latter half of the manufacturing process according to the sixth embodiment.
- FIG. 29 is a diagram showing an element structure of a conventional double-gate FinFET.
- FIG. 30 is a diagram showing an element structure of a conventional triple gate FinFET.
- FIG. 31 is a cross-sectional view showing an element structure of a conventional strained Si MOSFET.
- FIG. 32 is a view showing an element structure of a conventional strained SOI MOSFET.
- FIG. 33 is a cross-sectional view showing an element structure of a conventional MOSFET in which distortion is caused by a cap layer.
- FIG. 34 is a view illustrating a beam structure according to the present invention.
- the semiconductor device of the present invention is configured such that carriers (electrons and Z or holes) move in a radius beam, that is, current flows. Strain is introduced into the radial beam, and the mobility of carriers moving in the beam increases, resulting in a semiconductor device capable of high-speed operation. Therefore, it can be applied to various devices as long as the electrons and Zs or holes move in the radial beam, and the movement speed is related to the device performance.
- a FET field effect transistor
- the bent beam has a structure in which the doubly supported beam is bent, tensile strain can be reliably introduced into the semiconductor layer forming the beam.
- a doubly supported beam is a beam having both ends fixed. When the doubly supported beam is bent, tensile strain is introduced in the beam direction.
- the beam structure of the present invention will be described with reference to FIG. Figure 34 (a) shows the beam before the radius is formed.
- the beam 31a has a length L and is fixed at the fixed ends 32 and 33 by the fixing member 34, and the beam is in a floating state.
- the shape of the beam 31a in the width direction (the depth direction in the drawing in the drawing) is appropriately changed according to the structure of the device, as described later, and the width of the beam 31a is shorter than the height of the beam. This includes even those with very large beam widths.
- the material is a semiconductor, especially a single crystal semiconductor. In the specific examples to be described later, Si will be described as an example.
- a fixing member for fixing both ends of the beam 31a is a semiconductive material such as a semiconductor or an insulator. It can be appropriately formed of a material usable for the body device.
- the radius beam of the present invention has a structure in which a straight beam 31a in FIG. 34 (a) has a radius as shown in FIG. 34 (b).
- the radiused beam 31 has a larger crystal lattice spacing in the beam direction because the entire beam is elongated, and tensile strain is introduced into the semiconductor layer.
- the amount of strain introduced into the semiconductor layer is determined by the rate of elongation.
- the portion of the radiused beam has a radius R (>> beam height h) for simplicity.
- the length of the beam extending radially from the initial beam length L and the radius d and the distortion introduced are estimated as follows.
- Radial beam length 2Rtan _1 (L / 2 / (R— d))
- the radiused beam is slightly radiused! /
- the more force that is effective in introducing distortion for example, the distortion is 0.1% or more, preferably Preferably, the radius is generated so as to be 0.2% or more, more preferably 0.5% or more.
- the upper limit of the applied strain is the strain until the semiconductor layer undergoes elastic breakdown, and the radius may be generated in such a range.
- the amount of strain depends on the cross-sectional shape of the beam, for example, a range of 5% or less, particularly 3% or less, and further preferably 2% or less is preferable because elastic fracture hardly occurs.
- Such an amount of distortion is, to be precise, a force determined from the difference between the length of the radial beam and the length of the beam in a straight state.
- the ratio of d can be determined.
- the FET may be either a FinFET or a planar type FET.
- the width of the beam ie, the fin width
- the height M of the beam ie, the height of the fin
- the absolute value of the beam length L in the straight state and the center radius d is lOnm or more as the force L determined in consideration of the beam height h, preferably 50 nm or more, and more preferably lOOnm or more.
- d Even if L is too large, d for giving the necessary distortion becomes large, so that it is usually 100, OOOnm or less, preferably 10, OOOnm or less.
- d is greater than 0, preferably lnm or more, and more preferably 5 nm or more, and the problem in the process is usually 10, OOOnm or less, preferably 1, OOOnm or less, more preferably lOOnm or less.
- d are determined such that a predetermined amount of distortion is obtained within such a range.
- the beam needs to be large enough to form an element on the upper surface, and the width of the beam is 50 nm or more, preferably 100 nm or more. If the width of the beam is too large, it will be difficult to provide a gap under the beam, so it is usually less than 10, OOOnm, preferably less than 1, OOOnm.
- the height h (thickness) of the beam is, for example, 10 to 200 nm.
- L and d can be determined in almost the same manner as in the case of FinFET.
- a straight beam As a method for bending the beam, it is preferable to form a straight beam, fill the gap between the beam and the lower part of the beam with a liquid, and dry the liquid.
- Fig. 34 (a) after forming a straight beam 31a, the gap 35 under the beam is filled with liquid, and when the liquid is dried, the surface tension of the liquid causes the beam The part is stretched by being pulled to the bottom of the gap 35 (substrate side). Further, when this force exceeds the restoring force of the beam structure, the beam remains in the radiused state and adheres to the bottom of the gap and cannot be separated.
- liquid used here examples include an organic solvent, water, and mercury, and water and mercury are preferable because they have a large surface tension and easily cause a radius.
- the drying in the present invention includes a drying step which passes through a gas-liquid equilibrium curve in a phase diagram of a substance which is preferable to be dried while maintaining a surface tension as a liquid.
- spin drying may be performed by any method, dry nitrogen may be sprayed, the wafer may be heated, or drying may be performed under reduced pressure.
- the drying process is not preferred, as it does not pass through the vapor-liquid equilibrium curve in the phase diagram of the substance, such as supercritical drying via supercritical state and freeze drying.
- FIG. 1 and 2 are schematic structural views of a semiconductor device according to a first embodiment of the present invention.
- Figure 1 (a) is a top view
- Figures 1 (b), (c), and (d) are along the line A-A, line B-B, and line CC 'in Figure 1 (a), respectively.
- 2 (a) is a top view
- FIGS. 2 (b), (c) and (d) are lines A--A ', B--B' and C--C 'in FIG. 2 (a).
- FIG. 1 shows a double-gate FinFET before silicide formation.
- Fig. 2 shows a triple-gate FinFET before silicide formation.
- the semiconductor device of the first embodiment has a beam structure in which the fins 5 are radiused, and the central portion is embedded (embedded in the substrate). This is a FinFET adhered to the oxidation film 2).
- the pad of the source electrode 3 and the pad of the drain electrode 4 at both ends are fixed to the substrate (to the embedded oxide film 2) in the same manner as in the conventional FinFET. Also, the buried oxide film 2 below the fin 5 is dug down in order to create a state in which the fins 5 adhere to the substrate (buried oxide film 2). A force that creates a space below the fin 5 near the pad of the source electrode 3 and below the fin 5 near the pad of the drain electrode 4, which is not generated by the conventional FinFET.This part is filled with the insulating film 15 under the fin. .
- the fin 5 is originally formed into a shape similar to that of the conventional FinFET, and then adhered to the substrate (to the embedded oxide film 2) and fixed as it is.
- the shape becomes irregular.
- the lattice spacing of Si constituting the fin 5 is extended in the C—C ′ direction due to the bending of the fin 5, and the fin 5 portion is distorted Si.
- the mobility of carriers is improved, and the fin 5 is used as a channel of the FinFET.
- FIG. 29 For a double gate type and Fig. 30 for a triple gate type.
- FinFET is fabricated on SOI substrate with Si substrate 1, buried oxide film 2, and SOI layer (layer with source electrode 3, drain electrode 4 and fin 5 formed). Is done.
- a hard mask 9 is formed on the upper surface of the fin 5 and a gate insulating film 7 is formed on both side surfaces.
- a gate electrode 6 is provided so as to surround them. Since the thick hard mask 9 is formed on the upper surface of the fin, the upper surface of the fin does not function as a channel.
- a gate insulating film 7 is formed on the upper surface and both side surfaces of the fin 5, and a gate electrode 6 is provided so as to surround them.
- a channel is also formed on the upper surface of the fin.
- a sidewall is formed beside the gate electrode 6.
- the source electrode 3 and the drain electrode 4, including the pad portion are n-type in the case of an n-type FinFET, p-type in the case of a p-type FinFET, and have a surface force of the interface of the embedded oxide film 2 or the fin. Doped down to the bottom, forming a deep electrode.
- the source electrode 3 and the drain electrode 4 are connected to extensions having the same doping type and a small junction depth.
- a halo having a different conductivity type from the extension may be formed near the extension (not shown).
- the channel portion is generally doped with p-type for an n-type FinFET and n-type for a p-type FinFET, but may be used as i-type without doping.
- FIGS. 3 to 10 are the same as those of the double-gate FinFET (FIG. 1), which explains the manufacturing method of the triple-gate FinFET (FIG. 2), except for a part. The difference will be described later.
- the Si substrate 1, the buried oxide film 2, and the SOI layer are formed in the same manner as in the related art.
- the thickness of the SOI layer of the substrate is determined in consideration of the delamination process performed in the process described below and the amount reduced by sacrificial oxidation. For example, if the finished fin height is 40 nm, use an SOI substrate with a SOI layer thickness of 50 nm.
- channel injection is performed as follows. First, a sacrificial oxide film for channel implantation of 16 nm is formed on the SOI layer by, for example, wet oxidation. Thereafter, lithography is performed, and a p-type dopant is ion-implanted into a region to be an n-type Fin FET. For example a monovalent boron acceleration E energy 12 keV, ions are implanted at a dose of 8 X 10 12 cm_ 2. After the ion implantation of the p-type dopant, the resist is removed. Thereafter, lithography is performed, and an n-type dopant is ion-implanted into a region to be a p-type FinFET.
- a sacrificial oxide film for channel implantation of 16 nm is formed on the SOI layer by, for example, wet oxidation.
- lithography is performed, and a p-type dopant is ion-implanted into a
- monovalent phosphorus is accelerated to 33k Ion implantation is performed at eV and a dose of 3 ⁇ 10 12 cm _2 .
- the resist is stripped.
- the sacrificial oxide film is removed.
- lithography and dry etching are performed to form a pattern of a pad for the source electrode 3, a pad for the drain electrode 4, and a fin 5 on the SOI layer. After the etching, the resist is removed.
- the buried oxide film 2 is isotropically etched under the condition that the selectivity between Si and etching is large.
- an etching method using hydrofluoric acid can be given.
- the force fin 5 under which the undercut advances under the pattern has a narrow width, so that a gap is created below the fin and the fin 5 floats in the air (Fig. 4 (c), (d)), and the beam structure Is formed.
- the pad portion of the source electrode 3 and the pad portion of the drain electrode 4 are large in size, and therefore have an undercut at the bottom, but remain fixed to the substrate (buried oxide film 2).
- the fin 5 can be floated in the air and a beam structure can be manufactured.
- the length of the beam is L
- the depth of the gap under the beam is d.
- the fins 5 having the beam structure are immersed in the liquid 13. If, for example, water is used as the liquid 13, after etching with hydrofluoric acid in Fig. 4, hydrofluoric acid is immersed in water while resting on the S wafer, and the liquid on the wafer becomes sufficient water Substitute as follows.
- the liquid 13 is dried (FIG. 6).
- the fins 5 are pulled in the lower direction of the substrate due to the surface tension of the liquid, and when this force exceeds the restoring force of the fins 5, the fins 5 are kept in a radial state and the substrate (embedded oxide) is bent. Attaches to membrane 2). Even if the liquid completely disappears, the radiused fins 5 do not return to the original state due to the adhesive force on the substrate surface.
- Such a phenomenon is called a statusing phenomenon (adhesion phenomenon) and is a widely known phenomenon in the field of micromachines (for example, supervised by Masayoshi Esashi, "Micromachines are small-sized devices that integrate heterogeneous elements.” Advanced System ”, Industrial Technology Service Center, February 18, 2002, pp. 221-230, Nichiro Sakata“ Section 3 Measures for Statesking ”).
- a statusing phenomenon for example, supervised by Masayoshi Esashi, "Micromachines are small-sized devices that integrate heterogeneous elements.” Advanced System ”, Industrial Technology Service Center, February 18, 2002, pp. 221-230, Nichiro Sakata“ Section 3 Measures for Statesking ”).
- the field of micromachines once a part that should move originally adheres to the substrate and is fixed, it does not make sense as a machine. This is a phenomenon that usually causes a problem, and processing for avoiding this is performed.
- the fin is flexed by positively using this stateing phenomenon (adhesion phenomenon).
- adheresion phenomenon the lattice spacing of Si in the C—C ′ direction increases, resulting in strained Si.
- the greatest feature of the present invention is that the strained Si thus produced is used for the channel of the FET and the like.
- any drying method that passes through a gas-liquid equilibrium curve in a substance state diagram such as spin drying, spraying with dry nitrogen, heating a wafer, and drying under reduced pressure, as described above, may be used. In any way! /.
- liquid 13 Although an example of water is given as the liquid 13, it is also conceivable to use a liquid having a surface tension greater than that of water in order to more easily bend. However, due to the safety aspects of such liquids, only mercury should be used with extreme caution.
- the space below the fins 5 is filled with an insulating film 15 (FIG. 7).
- a thin oxide film 2 nm is formed (not shown), and SiN is deposited to a thickness of 60 nm. At this time, Si N
- the oxide film is removed.
- a single layer of SiO or a single layer of SiN is used as the insulating film under the fin 5.
- a gate insulating film 7 for example, an oxidized film of 1.8 nm is formed.
- the gate insulating film 7 in addition to the oxide film and the oxynitride film, TaO, AlO, HfO, ZrO, ZrON, HfO
- a so-called High-k film such as N, HfA10N, or HfSiON may be used.
- a gate electrode material is deposited (for example, poly Si of 100 nm) and lithographically etched to form the gate electrode 6.
- the gate electrode material in addition to poly-Si and poly-SiGe, metals such as TaN, TiN, W, and WN, and NiSi obtained by completely silicidizing poly-Si can also be used.
- extension implantation is performed to form extension regions 10 on the side and top surfaces of the Fin.
- lithography is performed and an n-type dopant is ion-implanted into a region to be an n-type FinFET.
- monovalent arsenic is implanted at an acceleration energy of 2.5 keV and a dose of 5 ⁇ 10 14 cm _2 .
- ion implantation is performed twice at a 45 ° angle so as to be implanted into both side surfaces of the fin 5 respectively.
- the resist is removed.
- lithography is performed, and a p-type dopant is ion-implanted into a region to be a p-type FinFET.
- ions are implanted at a dose of 6 X ⁇ ⁇ ⁇ 2.
- ion implantation is performed twice at a 45 ° angle so as to be implanted on both side surfaces of the fin 5 respectively.
- a material to be a sidewall insulating film for example, SiN is deposited to a thickness of 50 nm.
- the sidewall insulating film 8 is formed by etching back (FIG. 10).
- the sidewall insulating film may be made of SiO or the like, and may be made of a composite material such as SiO in the lower layer and SiN in the upper layer of 50 nm.
- ions source electrode, drain electrode
- lithography is used to implant an n-type dopant ion into the region that will become the n-type FinFET.
- a monovalent arsenic mosquitoes ⁇ energy 8 keV the ion implantation to a dose of 5 X 10 14 cm_ 2, further monovalent phosphorus mosquitoes ⁇ energy 5 keV, at a dose of 4 X 10 15 cm_ 2 Di on injection .
- the resist is removed.
- lithography is performed, and a p-type dopant is ion-implanted into a region to be a p-type FinFET.
- a monovalent boron mosquitoes ⁇ energy 2 keV it ion implanted at a dose 3 X 10 15 cm_ 2.
- the resist is removed.
- activation annealing for example, spike annealing at 055 ° C for 0 seconds.
- a silicide process is performed.
- CoSi is formed as silicide.
- NiSi, TiSi, CoSi, NiSi, PtSi, PdSi, etc. should be used for reside.
- the source electrode 3 and the drain electrode 4 may be raised by selective growth of Si.
- Si for example, at a substrate temperature of 640 ° C, SiH at a flow rate of 24 sccm for 10 seconds, and C1 at a flow rate of lsccm for 60 seconds.
- a deep electrode is formed by ion implantation.
- a double-gate FinFET (FIG. 1)
- a hard mask 9 is formed on the substrate.
- lithography and dry etching are performed to transfer the pattern of the pad of the source electrode 3, the pad of the drain electrode 4, and the fin 5 formed by the lithography to the node mask 9.
- the SOI layer is etched using the hard mask 9 as a mask. The subsequent process is the same as for the triple-gate FinFET.
- each FinFET constituting an integrated circuit.
- this FinFET is masked so as not to be etched by the buried oxide film etching of FIG. 4. It is good.
- the amount of distortion can be controlled by L and d as described above, the distortion can be controlled by changing L in each FinFET under a constant condition of d.
- the amount of buried oxide film etching d is changed for each FinFET, that is, the buried oxide film etching is performed a plurality of times, and the FinFETs are appropriately masked to give different distortions to each FinFET. Can be It is also possible to combine these methods.
- a (100) SOI wafer is used, and a triple-gate FinFET is laid out so that the Fin is parallel to the X-axis, with the notch 110> notch down.
- the fin top surface is the (100) plane
- the fin side surface is the (110) plane.
- the electron mobility decreases and the hole mobility increases. Therefore, the on-current obtained by the n-type FinFET is smaller than that of the triple-gate FinFET with the (100) plane on the Fin side.
- the on-current obtained by the p-type FinFET increases.
- the present invention is applied only to the n-type FinFET and the p-type FinFET is of the conventional type, the electron mobility increases due to the effect of distortion, and the current decrease of the n-type FinFET is sufficiently compensated. As a result, high-performance devices can be realized with both n-type FinFET and p-type FinFET.
- the material of the fin is not limited to Si, and another semiconductor material may be used.
- the above-described process of the present invention is performed using a thin-film SGOI substrate having no defect, a strained FinFET whose channel material is SiGe can be realized.
- FIGS. 11 and 12 are views schematically showing a second embodiment of the semiconductor device of the present invention.
- FIG. 11 (a) is a top view
- FIGS. 11 (b), (c) and ( 11D is a cross-sectional view taken along line AA, line BB, line, and line CC ′ in FIG. 11A.
- 12 (a) is a top view
- FIGS. 12 (b), (c) and (d) are lines A--A ', B--B' and C--C 'in FIG. 12 (a).
- FIG. 11 shows a double-gate FinFET before silicide formation.
- FIG. 12 shows a triple-gate FinFET before silicide formation.
- the second embodiment differs from the first embodiment in the manufacturing method, and the steps are shortened.
- the different points are the shape of the gate electrode 6 and the insulating film below the fin 5.
- the shape of the gate electrode 6 of the second embodiment is a so-called notch type gate shape, which is smaller than the length of the portion in contact with the gate insulating film 7 and the length of the upper portion of the gate.
- the fin width w must be less than or equal to twice the notch width to use the etching to create this notch type gate shape (the reason will be described later).
- the gate electrode material a material that easily forms a notch-type gate is preferable (for example, poly-Si is used).
- the insulating film below the fin is formed simultaneously with the side wall insulating film 8, so that the material of the insulating film below the fin is necessarily the same as that of the side wall insulating film 8.
- the structure of the other parts is the same as that of the first embodiment.
- the second embodiment similarly to the first embodiment, first, a series of steps of channel implantation is performed, and then the first embodiment is described with reference to FIGS. 3 to 6. Then, a pattern of the pad of the source electrode 3, the pad of the drain electrode 4 and the fin 5 is formed (FIG. 3), the fin 5 is formed into a beam structure (FIG. 4), and the space below the fin is filled with liquid (FIG. 5). ), And dry the liquid to bend the fins 5 (Fig. 6). After that, in the first embodiment, a step of filling the space below the fins 5 with an insulating film (FIG. 7) was performed, but in the second embodiment, after the fins 5 were bent, the gate insulating film 7 was removed.
- a material to be a gate electrode is deposited. Therefore, the material to be the gate electrode enters the space below the fin. Thereafter, a force for forming a gate electrode by performing lithography and gate etching is performed. At this time, etching is performed so as to form a notch type gate shape. [0079] Etching to create a notch-type gate shape is described in, for example, September 2002, Journal of Vacuum Science and Technology, Vol. B20, No. 5, pp. 2024-2031 (Journal of Vacuum Science and Technology, P. 2024-2031, VOL.B20, N0.5, September / October, 2002).
- anisotropic etching is performed under conditions such that a sidewall protective layer is formed, and about 1Z3 to about half of the gate electrode layer is etched.
- the etching conditions are changed to conditions under which the etching proceeds anisotropically without forming the sidewall protection layer, and the etching is continued. Change the etching conditions just before reaching the gate insulating film, and stop etching properly on the gate insulating film. After that, the etching conditions are changed to form the sidewall protection layer, and the lower portion of the gate electrode is etched in the lateral direction.
- etching is sequentially performed by changing the gas, power, and pressure, so that the etching is performed continuously in one chamber. For example, when etching a poly-Si gate electrode layer, first etch with a native oxide film using CF ZAr and then with HBrZCl.
- Etching is performed anisotropically while forming a sidewall protective layer under the condition of adding O. After this,
- the etching of the electrode layer was continued, and the condition was changed to the condition where O was added with HBrZCl system again.
- the tuning is advanced to the gate insulating film. After that, switch to the condition where O was added to HBr
- the lower portion of the gate electrode, on which the sidewall protective layer is not formed is overetched in the lateral direction.
- a zonchi-type gate shape in which the gate lower portion is smaller than the upper portion can be obtained.
- the etching process for obtaining a notch-shaped gate shape After the etching of the gate electrode material reaches the buried oxide film 2, the etching proceeds in the lateral direction. At this time, the gate electrode material under the fins 5 is simultaneously etched and removed by the lateral etching, which is not so strong as the partial force S of the gate electrode 6 in contact with the gate insulating film 7 decreases.
- the space under the fin 5 is not filled with the insulating film before the gate electrode is formed, it is necessary to remove the gate electrode material buried in the space under the fin. For this reason, once a normal-shaped gate electrode is formed, etching proceeds in the lateral direction. Such etching must be performed. For this purpose, an etching process for obtaining a notched gate shape is used.
- the notch width (the amount etched in the lateral direction) cannot be made as large as usual. Since it is about 30 nm, the fin width w is limited to not more than twice the notch width on one side (for example, if the notch width is 20 nm, the fin width is 25 nm ( ⁇ 20 nm X 2)). If this condition is not satisfied, the gate electrode material below the fin 5 is not removed.
- the gate insulating film 7 other than under the gate electrode 6 is removed (FIG. 13). Thereafter, extension implantation is performed (FIG. 14), and an insulating film serving as a sidewall is deposited. Thereafter, the sidewalls are formed by etching back. At this time, in this embodiment, the space under the fin can be simultaneously filled with the sidewall insulating film (FIG. 15).
- the subsequent process is the same as in the first embodiment. That is, if necessary, selective growth of Si is performed, lithography is performed to form a deep electrode, ion implantation is performed, and after the implantation, the resist is removed. Thereafter, activation annealing is performed. Thus, the state shown in FIG. 12 is obtained. Further, silicide is formed, an interlayer insulating film is deposited, lithography is performed, a contact hole is formed, and the resist is removed. Then, a contact is formed.
- the present embodiment has an advantage that, compared to the first embodiment, the number of steps is reduced by the step of forming an insulating film below the fins (FIG. 7). .
- FIG. 16 and FIG. 17 are diagrams schematically showing a third embodiment of the semiconductor device of the present invention.
- FIG. 16 (a) is a top view
- FIGS. 16 (b), (c) and (d) are along the line A—A, line B—B, line C—C ′ in FIG.
- FIG. 17 (a) is a top view
- FIGS. 17 (b), (c) and (d) are lines A--A ', B--B' and C--C 'in FIG. 17 (a).
- FIG. 16 shows a double-gate FinFET before silicide formation
- Fig. 17 shows a triple-gate FinFET, showing the state before silicide formation. Is shown.
- the third embodiment of the present invention is different from the first embodiment in the method of forming the node of the source electrode 3 and the pad of the drain electrode 4. Reflecting this difference, the structure is also partially different. The difference in structure is that the pad of the source electrode 3 and the pad of the drain electrode 4 are raised. The structure of the other parts is the same as that of the first embodiment.
- a channel implantation step is performed first, as in the first embodiment. Thereafter, as shown in FIG. 18, lithography and dry etching are performed to form only the pattern of the fin 5 on the SOI layer. After the etching, the resist is removed.
- the pattern of the fins 5 is formed because the pattern is a simple line and space, and the pitch is reduced to the limit of lithography.
- the pitch is reduced to the limit of lithography.
- the pitch can be reduced, more current per unit width can be obtained.
- the direction of the fins 5 is the same in all the chips.
- a double-gate FinFET In the case of a double-gate FinFET (FIG. 16), channel implantation is performed, the sacrificial oxide film is removed, and then a hard mask 9 is formed on the substrate. After this, lithography and dry etching By performing ching, only the pattern of the fins 5 formed by lithography is transferred to the hard mask 9. After removing the resist, the SOI layer is etched using the hard mask 9 as a mask. Thereafter, an insulating film 16 for CMP is deposited, and lithography and dry etching are performed to make a hole for the pad of the source electrode 3 and a hole for the pad of the drain electrode 4, and remove the resist.
- the pitch of the fins 5 can be reduced to the limit of the lithography performance by manufacturing the fins 5 first, compared to the first and second embodiments.
- a large current per unit width can be obtained.
- Another advantage is that since the pad of the source electrode 3 and the pad of the drain electrode 4 are raised, the contact formation including the silicide process is facilitated.
- the fourth embodiment differs from the first, second, and third embodiments in the method of arranging the fins 5, the pad of the source electrode 3, and the node / node of the drain electrode 4.
- the pad of the pair of source electrodes 3 and the pad of the drain electrode 4 are connected by a plurality of fins 5.
- FIGS. 21 and 22 illustrating the arrangement method are top views of the FinFET manufactured by the manufacturing method of the first embodiment, but the FinFET manufactured by the manufacturing method of the second embodiment also The same arrangement method can be applied to the FinFET manufactured by the manufacturing method of the third embodiment.
- one fin 5 is connected to a pair of the pad of the source electrode 3 and the pad of the drain electrode 4.
- FIG. 21 (a) a case where a plurality of (two or more) fins 5 are connected (an example used and described so far, for example, FIG. 2 (a)).
- Fig. 21 (b) shows an example in which one fin 5 is connected to a pair of the pad of the source electrode 3 and the pad of the drain electrode 4, and more than one (two or more) are arranged for one gate electrode.
- Figure 21 (c) shows an example in which a plurality of fins 5 are connected to a pair of source electrode 3 pads and a drain electrode 4 pad. It is. In addition, one fin is connected to one pair of source electrode pad and drain electrode pad for one gate electrode, and multiple fins are connected to one pair of source electrode pad and drain electrode pad. Can be arranged side by side (Fig. 21 (d)). In this case, the order of arrangement and the number of each arrangement are arbitrary.
- FIG. 22E shows an example in which the pads of the source electrode 3 in FIG. 21B are combined into one.
- the electrode pads it is also possible to combine the electrodes constituting the pair of the source electrode 3 pad and the drain electrode 4 pad for different gate electrodes.
- the pad of the drain electrode of the upper FinFET and the pad of the source electrode of the lower FinFET are grouped together.
- a FinFET pattern obtained by repeating the above arrangement operation an arbitrary number of times can be manufactured by any of the manufacturing methods described in the first to third embodiments. The process does not change.
- the present invention is applicable to any FinFET layout in an integrated circuit.
- FIG. 23 and FIG. 24 are diagrams schematically showing a fifth embodiment of the semiconductor device of the present invention.
- 23 (a) is a top view
- FIGS. 23 (b), (c) and (d) are along the line A—A, line B—B, line C—C ′ in FIG. 23 (a), respectively.
- FIG. 24 (a) is a top view
- FIGS. 24 (b), (c) and (d) are lines A--A ', B--B', and C--C 'in FIG. 24 (a). It is sectional drawing along each.
- FIGS. 23 and 24 show a triple-gate FinFET before silicide formation.
- the fifth embodiment differs from the first to fourth embodiments in either or both of the position at which the FinFET gate electrode 6 is formed and the number of gate electrodes to be formed.
- the gate electrode is formed at the center of the fin that is radially attached to the substrate.
- the FinFET gate electrode 6 is not formed at the center of the fin 5 radially attached to the substrate, but is formed at a position other than the center of the point where the fin 5 is divided into four parts. Has been.
- a plurality (two) of gate electrodes are formed from one fixed end of the fin 5 to the other fixed end.
- the force of one fixed end of the fin 5 to the other fixed end is longer than in the case where one gate electrode is provided.
- the contact is provided at the center of the fin 5, so that the length of the fin 5 is equal to the length required for forming the contact and the length required for forming another gate electrode. It's getting longer.
- the difference between FIG. 23 and FIG. 24 is the difference in how to take the electrode at the center of the fin 5.
- a so-called slit contact is used in which metal is used to surround the fin 5 having a silicide formed on the upper surface thereof, and the contact is made.
- an electrode material for example, poly-Si
- the manufacturing method is the same as the manufacturing method of the first embodiment until before the silicide is formed.
- the state before silicide formation is as shown in Figure 23.After that, silicide is formed, an interlayer insulating film is deposited, lithography and etching are performed, contact holes are formed, and metal is buried to form contacts. I do. At this time, the contact provided at the center of the fin 5 is a slit contact, and the contact is formed so as to cover the fin with metal.
- FIG. 24 the process is the same as in the first manufacturing method until the fins 5 are attached to the substrate. Thereafter, steps corresponding to FIGS. 19 and 20 of the third embodiment are performed to form the central electrode 14. That is, an insulating film for CMP is deposited, lithography and dry etching are performed, a hole for a pad of the central electrode 14 is formed, and the resist is removed. Then, the material for the central electrode 14 (e.g., poly-Si) is deposited and C Do MP. Then, the insulating film 16 for CMP is removed.
- an insulating film for CMP is deposited, lithography and dry etching are performed, a hole for a pad of the central electrode 14 is formed, and the resist is removed. Then, the material for the central electrode 14 (e.g., poly-Si) is deposited and C Do MP. Then, the insulating film 16 for CMP is removed.
- the material for the central electrode 14 e.g., poly-Si
- the state shown in FIG. 24 is obtained by performing the process from FIG. 4 of the first embodiment. After that, silicide is formed, an interlayer insulating film is deposited, lithography and etching are performed, a contact hole is formed, and a metal is buried to form a contact.
- the gate electrode does not necessarily need to be formed at the center of the fin radially attached to the substrate. It can be formed at the position of.
- a plurality of (two or more) gate electrodes are provided so that only one gate electrode is provided to one fixed fin of the one fin adhered to the substrate to the other fixed end.
- the gate electrode in the center of the fin that is radially attached to the substrate even in the case of the double-gate FinFET described using the triple-gate FinFET as an example. It can be formed at any position, and the force of one fixed end of one fin that adheres to the substrate radially The multiple (two or more) gates provided up to the other fixed end with only one gate electrode There is no change in being able to provide electrodes.
- FIG. 25 shows the structure of the semiconductor device according to the sixth embodiment.
- 25 (a) is a top view
- FIGS. 25 (b), (c) and (d) are along the line A--A, line B--B, line, and line C--C in FIG. 25 (a), respectively.
- FIG. FIG. 25 shows a planar type MOSFET before the silicide is formed.
- the sixth embodiment is a planar type MOSFET in which Si in a channel portion is bent and strained as shown in FIGS. 25 (b) and 25 (d). Both ends of the surface Si layer are fixed with STI 11 and point force radially adhered to the substrate (actually to the cell 12). This is a characteristic point. Since the Si layer on the surface is fixed at both ends with STI11 and is radiused, when viewed microscopically, the Si layer on the surface is composed. The lattice spacing of the formed Si is extended in the A-A 'direction (or C-C' direction), resulting in strained Si. In the case of strained Si, the mobility is improved by the above-described principle. In the present embodiment, this is used as a channel of a planar type MOSFET.
- the MOS FET of the present embodiment has another structural difference from the conventional one.
- the STI located around the MOSFET is partially etched back to form the STI21 that has been dug down. This is because, in the present embodiment, a S ON (Silicon on Nothing) structure is formed and used as the beam structure.
- the beam structure is prepared, the beam is flexed and adhered, and the lower part of the beam is buried with an insulating film as in the first embodiment.
- the present embodiment is basically a planar type MOSFET, its basic configuration is the same as that of a conventional type MOSFET (for example, FIG. 33).
- the MOSFET of the present embodiment is manufactured on a Balta Si substrate 1.
- a gate insulating film 7 is formed on the upper surface of the strained Sil 9 serving as a channel, and a gate electrode 6 is further provided thereon.
- the source electrode 3 and the drain electrode 4 have a raised structure.
- the n-type MOSFET is n-type
- the p-type MOSFET is p-type.
- the source electrode 3 and the drain electrode 4 are connected to an extension 10 having the same doping type and a small junction depth.
- a halo having a different conductivity type from the extension 10 may be formed near the extension 10 (not shown).
- the channel is doped with p-type for n-type MOSFETs and n-type for p-type MOSFETs.
- FIGS. 26 to 28 a manufacturing method according to the sixth embodiment will be described with reference to FIGS. 26 to 28.
- ⁇ ⁇ (Kl) is the cross section of A-A in Fig. 25, where (gl) is only the C C 'cross section ⁇ , (a2), (b2 ) ⁇ ⁇ ⁇ (K2) is the cross section B-B in Fig. 25.
- a SiGe layer 24 having a critical thickness or less is formed on a Si substrate 1, and a Si layer 25 is epitaxially grown thereon.
- the thickness of the SiGe layer be sufficiently smaller than the critical thickness.
- the SiGe layer does not relax, its lattice constant becomes the lattice constant of Si.
- the lattice-relaxed SiGel8 shown in FIGS. 31 and 32 there are almost no defects or dislocations.
- STI 11 is formed, and ion implantation is performed to form a well 12. In addition, ion implantation of the channel is performed. In this step, for example, an STI 11 having a depth of 250 nm is formed.
- Ueru 12 performs lithography, the region to be the n-type MOSFET, the ion implantation of p-type dopant (e.g., 1 to a monovalent boron in mosquito ⁇ energy 150keV 5 X 10 13 cm_ 2) to To form Further, ion implantation of a p-type dopant (for example, monovalent boron is performed at an acceleration energy of 30 keV at 7 ⁇ 10 12 cm — 2 ) is performed to implant ions in the channel region. After the ion implantation, the resist is removed.
- p-type dopant e.g., 1 to a monovalent boron in mosquito ⁇ energy 150keV 5 X 10 13 cm_ 2
- ion implantation of a p-type dopant for example, monovalent boron is performed at an acceleration energy of 30 keV at 7 ⁇ 10 12 cm — 2
- the resist is removed.
- n-type dopant for example, 1.5 ⁇ 10 13 cm— 2
- MOSFET for example, monovalent phosphorus at an acceleration energy of 350 keV.
- the n-type dopant e.g., monovalent arsenic mosquitoes ⁇ energy lOOkeV 2.
- 8 X 10 1 2 cm_ 2 is ion-implanted, ion implantation of the channel region. After ion implantation, the resist is stripped.
- a part of the STI around the MOSFET is etched back and the STI 21 And
- the etch back may be slightly deeper than the SiGe layer 24 as long as the depth is such that the side surface of the SiGe layer 24 is exposed.
- the Si layer 25 is rectangularly partitioned by the STI, so in the arrangement of FIG. 25A, the STI 11 located on the upper side and the lower side of the partitioned Si layer 25 is etched back. Become STI21! /
- the SON structure is applied to the liquid 13 as in the first to fifth embodiments, as shown in FIGS. 27 (el) and (e2).
- the liquid 13 may be water.
- the liquid 13 is dried as shown in FIGS. 27 (fl) and (f2).
- the Si layer 25 is pulled toward the substrate due to the surface tension of the liquid, bends, and adheres to the substrate in this state. Even if the liquid dries, the radiused Si layer 25 does not return to its original state due to the adhesive force of the substrate and remains in this state. In this way, strain Sil9 is created, which is the channel of the MOSFET.
- any drying method can be used as long as it passes through a gas-liquid equilibrium curve. This is the same as in the case of FinFET.
- the side opening under the strain Sil 9 is filled with the insulating film 22 and closed.
- This step is performed as follows. First, for example, a thin oxide film of 2 nm is formed (not shown), and 50 nm of SiN is deposited. At this time,
- the CVD method is used for the 3 4 3 4 product. Thereafter, the SiN is etched back. Etch back and strain
- the difference from the FinFET of the first embodiment is that, in the planar type MOSFET, the channel width is not as small as the Fin width of the FinFET, so that the position below the center of the strain Sil9, that is, the position of the line In this case, no insulating film is formed under the strain Sil9, and the space remains (FIG. 27 (fl)). Only the vicinity of the side opening, such as the position of the line C—C ′, is filled with the insulating film 22 as shown in FIG.
- a gate insulating film 7 is formed, a gate electrode material is deposited, and lithography and dry etching are performed to form a gate electrode 6.
- the gate insulating film 7 is removed by looking under the gate electrode 6 (FIGS. 27 (hi) and (h2)). For example, a 1.2 nm oxynitride film is formed, and then poly Si is deposited to a thickness of 75 nm.
- the material of the gate insulating film 7 and the material of the gate electrode those described in the first embodiment can be applied to the present embodiment.
- lithography is performed and ion implantation is performed to form an extension 10 (Fig. 28 (il), (12)). That is, an n-type dopant is implanted into a region to be an n-type MOSFET. Inject ON. For example a monovalent arsenic mosquito ⁇ energy 2 keV, a dose of 5 X 10 14 cm_ 2 Ions are implanted. After ion implantation of the n-type dopant, the resist is removed. Thereafter, lithography is performed, and a p-type dopant is ion-implanted into a region to be a p-type MOSFET. For example, ion Note monovalent BF mosquito ⁇ energy 2 keV, a dose of 5 X 10 14 cm_ 2
- the resist is removed.
- a sidewall insulating film 8 is formed (FIGS. 28 (jl) and (j2)). 0
- etch back is performed.
- the sidewall insulating film may be made of another material described in the first embodiment or a combination of a plurality of materials.
- a deep electrode is formed by ion implantation.
- an n-type dopant is ion-implanted into a region to be an n-type FinFET.
- monovalent arsenic is ion-implanted at an acceleration energy of 8 keV and a dose of 5 ⁇ 10 14 cm _2
- monovalent phosphorus is ion-implanted at a ketone speed energy of 5 keV and a dose of 4 ⁇ 10 15 cm _2 .
- the resist is removed.
- a p-type dopant is ion-implanted into a region to be a p-type FinFET.
- a monovalent boron mosquitoes ⁇ energy 2 keV ions are implanted at an de chromatography's weight 3 X 10 15 cm_ 2.
- the resist is removed.
- an activation e.g., a 0 second snook anneal at 1055 ° C.
- a contact may be formed after performing a silicide process (not shown).
- the type of silicide and the metal of the contact that can be applied to the present embodiment are the same as in the first embodiment.
- a planar type MOSFET can be manufactured using a bent beam structure as a channel.
- a conventional planar p-type MOSFET with a channel in the ⁇ 110> direction, fabricated on a Balta Si (100) substrate has so far been experimentally experimentally more parallel than the direction perpendicular to the gate electrode. It has been reported that applying a tensile strain in any direction improves the mobility, so when using this embodiment, bend in the B-B 'direction rather than in the A-A' direction. Better.
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Abstract
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JP2006514479A JP5056011B2 (ja) | 2004-06-10 | 2005-06-03 | 半導体装置及びその製造方法、FinFETの製造方法 |
US13/067,584 US8486811B2 (en) | 2004-06-10 | 2011-06-10 | Semiconductor device and manufacturing process therefor |
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