KR20120120038A - Mos semiconductor device and methods for its fabrication - Google Patents
Mos semiconductor device and methods for its fabrication Download PDFInfo
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- KR20120120038A KR20120120038A KR1020120040582A KR20120040582A KR20120120038A KR 20120120038 A KR20120120038 A KR 20120120038A KR 1020120040582 A KR1020120040582 A KR 1020120040582A KR 20120040582 A KR20120040582 A KR 20120040582A KR 20120120038 A KR20120120038 A KR 20120120038A
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- dummy gate
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- 238000000034 method Methods 0.000 title claims abstract description 43
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- 239000012535 impurity Substances 0.000 claims abstract description 35
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- 238000005468 ion implantation Methods 0.000 claims description 13
- 125000006850 spacer group Chemical group 0.000 claims description 10
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- 125000001475 halogen functional group Chemical group 0.000 description 5
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- 238000009826 distribution Methods 0.000 description 3
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- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/265—Bombardment with radiation with high-energy radiation producing ion implantation
- H01L21/26506—Bombardment with radiation with high-energy radiation producing ion implantation in group IV semiconductors
- H01L21/26513—Bombardment with radiation with high-energy radiation producing ion implantation in group IV semiconductors of electrically active species
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/265—Bombardment with radiation with high-energy radiation producing ion implantation
- H01L21/2658—Bombardment with radiation with high-energy radiation producing ion implantation of a molecular ion, e.g. decaborane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/10—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions with semiconductor regions connected to an electrode not carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/1025—Channel region of field-effect devices
- H01L29/1029—Channel region of field-effect devices of field-effect transistors
- H01L29/1033—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure
- H01L29/1041—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure with a non-uniform doping structure in the channel region surface
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. 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
- H01L29/66545—Unipolar field-effect transistors with an insulated gate, i.e. MISFET using a dummy, i.e. replacement gate in a process wherein at least a part of the final gate is self aligned to the dummy gate
Abstract
A Morse device having a channel region selectively formed therein and a method of manufacturing the same are provided. This method includes forming a mask defining a gate region on a surface of a semiconductor substrate. Source and drain regions aligned with the gate regions are formed in the semiconductor substrate, and sub-surface under-doped impurity regions are formed in the semiconductor substrate using the mask as a doping mask. Thereafter, a gate electrode aligned with the gate region is formed on the semiconductor substrate using the mask as a gate alignment mask.
Description
In general, the present invention relates to a semiconductor device and a method of manufacturing the same, and more particularly, to a MOS semiconductor device having a selectively formed channel region and a method for manufacturing such a semiconductor device.
Today, most integrated circuits (ICs) are implemented using a plurality of interconnected field effect transistors (FETs), referred to simply as metal oxide semiconductor field effect transistors (MOSFETs), or simply MOS transistors. One MOS transistor includes a gate electrode as a control electrode and includes a source and a drain region spaced apart from each other and formed in the semiconductor substrate, so that current may flow between the source region and the drain region. The control voltage applied to the gate electrode controls the flow of current through the channel between the source and drain regions.
The manufacture of integrated circuits faces a number of challenges. As functions implemented in integrated circuits (ICs) become more and more complex, more MOS transistors must be integrated on integrated circuit chips. Integrated circuits not only become more complex, but also tend to require increasingly faster integrated circuits. That is, there is a tendency to reduce the switching speed of integrated circuits.
As the number of transistors on an IC increases, there is a need to reduce the size of each individual transistor and hence the size of the components constituting the transistor. Reducing the size of the MOS transistor requires reducing the spacing between the source and drain regions, while reducing the source-drain spacing is not only a punch through breakdown, but also a number of short channel effects. Can cause problems. Typical solutions to these problems include halo implants to counter short channel effects and punch through implants to increase doping of the channel and substrate wells to prevent punch throughs. However, these solutions cause other problems.
Junction capacitance, i.e., the capacitance of the source-substrate junction and especially the drain-substrate junction, has a great influence on the speed of the IC because these capacitances must be charged or discharged during the switching operation. Junction capacitance is increased by increasing impurity doping of the material on either side of the junction. Typical halo implants, threshold voltage implants, and punch-through implants increase impurity doping in substrate wells and channels, thus increasing junction capacitance and adversely affecting switching speed.
One of the approaches considered was to lower the impurity doping concentration in the substrate well to increase the dose of the punch through implant and reduce the junction capacitance by placing the implant deeper in the channel region. However, in a typical MOS process, the threshold voltage implant and punch-through implant are applied over the entire active region of the transistor, including the channel region and the source / drain regions. Therefore, placing the punch through implant deeper in the channel region actually positions the implant below the source and drain regions, which increases but does not reduce the junction capacitance. Therefore, this solution is not a valid solution.
In addition to the junction capacitance problem, increased doping concentration below the source / drain extension region results in increased band-band leakage current (or referred to as gate induced drain leakage or GIDL). This leakage current establishes a floor below which the leakage current can no longer be reduced, so this leakage current reduces the static power consumption of a given technique and the static power consumption of devices made based on that technique. To establish. To reduce the leakage current, the short channel characteristics of the device must be improved without increasing the punch through or halo doping under the source / drain extension region.
Accordingly, there is a need to provide a method of manufacturing an integrated circuit in which the source-drain spacing of the MOS transistor is reduced without adversely affecting the switching speed of the integrated circuit. In addition, it is desirable to provide a MOS transistor that can ensure the switching speed required for the integrated circuit implementation. In addition, it is desirable to provide a MOS transistor having a good short channel controllability with minimal halo or source drain doping, and having a low junction capacitance and a low interband leakage current, and a method of manufacturing the same. Furthermore, other desirable advantages and other features of the present invention will become apparent from the following detailed description and claims in view of the accompanying drawings and the background art as described above.
According to an embodiment of the present invention, there is provided a method for manufacturing a MOS device, the method comprising: depositing a dummy gate material layer on a surface of a semiconductor substrate and patterning the dummy gate material layer to form a dummy gate It includes. Spaced apart source and drain regions are implanted in alignment with the dummy gate, and a gap fill material is deposited over the semiconductor substrate and the dummy gate. A portion of the gapfill material is removed to expose the top surface of the dummy gate and the dummy gate is removed to form a recess extending through the gapfill material. Conductivity determining ions are implanted through the recess and into the semiconductor substrate to form a channel region doped with impurities between the spaced source and drain regions. A portion of the surface of the semiconductor substrate over the doped channel region is exposed and a gate insulator and a gate electrode are formed over the portion of the surface.
According to another embodiment of the present invention there is provided a method for manufacturing a MOS device, the method comprising forming a mask defining a gate region on a surface of a semiconductor substrate. Source and drain regions are aligned in the gate region and formed in the semiconductor substrate, and an enhanced doping sub-surface impurity region is formed in the semiconductor substrate using the mask as a doping mask. A gate electrode aligned with the gate region is formed on the semiconductor substrate using the mask as a gate alignment mask.
According to another embodiment of the present invention, a MOS device is provided, which includes a gate electrode on a semiconductor substrate, and which is spaced apart sources aligned with the gate electrode and formed in the semiconductor substrate. And drain regions. An impurity doped channel region is under the gate electrode and is spaced apart from the source and drain regions.
DETAILED DESCRIPTION Hereinafter, the present invention will be described with reference to the accompanying drawings, in which like reference numerals designate like elements.
1 is a graphical illustration of impurity doping found in a well region or substrate region under a gate electrode of a conventional MOS device.
2 through 10 are cross-sectional views illustrating a portion of a MOS integrated circuit device and a fabrication method in accordance with various embodiments of the present invention.
The following detailed descriptions are merely exemplary and are not intended to limit the invention or its application or use. In addition, the present invention is directed to any theory expressly or implied provided in the technical field as described above, the background technology, the problem to be solved and the means for solving the problem or in the following detailed description of the invention. It is not limited.
1 is a graphical illustration of impurity doping found in the well region or substrate region under the gate electrode of a conventional MOS device, illustrating the problems involved in this conventional structure. The
2-10 are cross-sectional views illustrating portions of a MOS integrated circuit device and various embodiments for fabricating the same that may avoid problems due to impurity doping distributions as previously illustrated. A portion of the illustrated
Various steps relating to MOS transistor fabrication are well known and, for the sake of simplicity, many conventional steps will be omitted herein without mentioning only briefly or providing well known process details. Although the term "MOS device" strictly refers to a device having a metal gate electrode and an oxide gate insulator, the term herein refers to a conductive material placed over a gate insulator (oxide or other insulator) placed on a semiconductor substrate. It will be used to collectively refer to any semiconductor device including a gate electrode (metal or other conductive material).
A method for manufacturing an
Next, the method for manufacturing a semiconductor device in accordance with one embodiment of the present invention continues by forming a thin insulating
Next, as shown in FIG. 4, the layer of dummy gate material is patterned to form a
According to one embodiment,
A layer of
Although this description of the various embodiments focuses solely on the fabrication of n-channel MOS transistors, one of ordinary skill in the art will appreciate that while the source and drain impurity doping process steps as described above are performed, It will be appreciated that a layer of mask material may be applied to cover and protect p-channel devices that may be part of an IC device. After the n-type source and drain regions are completed, this mask layer can be removed and another mask layer applied to cover and protect the n-channel devices. The p-channel devices can then be processed in a manner similar to that described for n-channel devices, with the obvious change in the impurity doping type. After each of the device types has been implanted or after source and drain implantation has been performed for both device types, thermal annealing may be performed to activate the implanted ions.
After removing any protective mask layer that may have been formed on the n-channel devices during the processing of the p-channel devices, the method according to one embodiment of the present invention proceeds as shown in FIG. The
According to one embodiment of the method for manufacturing a semiconductor device, localized punch through and threshold implantation ion implantation are performed. As shown in Fig. 8, using the layer and sidewall spacers of the gapfill material as the implantation mask, the conductivity crystal ions pass through the
Although not illustrated in the figures, according to another embodiment, the localized
Regardless of how the
A localized
After deposition of the
If a CMOS device is fabricated, the p-localized sub-surface region doped with n-type dopant ions may be formed in a manner similar to the manner in which the
As will be appreciated by those skilled in the art,
While at least one exemplary embodiment has been provided in the foregoing detailed description, it should be noted that a large number of variations may exist. It should also be noted that these exemplary embodiments are merely exemplary and are not intended to limit the scope, applicability, and configuration of the present invention in any way. Alternatively, the foregoing detailed description of the invention will provide those skilled in the art with a convenient road map in which exemplary embodiments of the invention may be implemented. In addition, it should be noted that various changes may be made in the size, spacing, and doping of components without departing from the scope of the present invention as disclosed in the appended claims and their legal equivalents.
Claims (20)
Depositing a dummy gate material layer on a surface of a semiconductor substrate and patterning the dummy gate material layer to form a dummy gate;
Implanting impurities into source and drain regions aligned with the dummy gate and spaced apart from each other;
Depositing a gap fill material over the semiconductor substrate and the dummy gate;
Removing a portion of the gapfill material to expose the top surface of the dummy gate;
Removing the dummy gate to form a recess extending through the gapfill material;
Implanting conduction determining ions through the recess and into the semiconductor substrate to form a doped channel region between the spaced source and drain regions;
Exposing a portion of the surface of the semiconductor substrate over the doped channel region; And
Forming a gate insulator and a gate electrode over the portion of the surface
Method of manufacturing a Morse device comprising a.
Depositing the dummy gate material layer,
Depositing a layer of polycrystalline silicon.
Forming sidewall spacers on the dummy gate
The method of manufacturing a Morse device further comprising.
Injecting impurities into the source and drain regions spaced apart from each other,
Implanting impurities into source and drain extensions aligned with the dummy gate; And
Implanting impurities into the dee source and drain regions aligned with the sidewall spacers
Method of manufacturing a MOS device comprising a.
Depositing the gapfill material comprises depositing a dielectric material and removing the portion of the gapfill material comprises chemical mechanical planarization.
Injecting the conductivity crystal ions,
Implanting ions into the semiconductor substrate to have a peak dopant concentration at 25-50 nm below the semiconductor substrate.
Injecting the conductivity crystal ions,
And implanting one type of ions to locally increase the conductivity of the substrate.
Forming the gate insulator and the gate electrode,
Depositing a high dielectric constant insulator material and a metal layer overlying the dielectric material.
Performing chemical mechanical planarization of the metal layer
The method of manufacturing a Morse device further comprising.
Forming a mask defining a gate region over the surface of the semiconductor substrate;
Forming source and drain regions in the semiconductor substrate aligned with the gate region;
Using the mask as a doping mask to form an enhanced doping sub-surface impurity region in the semiconductor substrate; And
Forming a gate electrode on the semiconductor substrate to be aligned with the gate region using the mask as a gate alignment mask
Method of manufacturing a Morse device comprising a.
Forming the mask,
Depositing a dummy gate material layer;
Patterning the dummy gate material layer;
Forming sidewall spacers on the patterned dummy gate material layer;
Depositing a layer of gapfill material over the patterned dummy gate material layer;
Removing a portion of the gapfill material to expose a top portion of the patterned dummy gate material layer; And
Removing the patterned dummy gate material layer
Method of manufacturing a Morse device comprising a.
Forming the source and drain regions,
Forming a first region aligned with the patterned dummy gate material layer; And
Forming a second region aligned with the sidewall spacers
Method of manufacturing a MOS device comprising a.
Forming the sub-surface impurity region of the enhanced doping,
Using the mask as an ion implantation mask to implant selected conductivity crystal ions to increase the conductivity of the sub-surface impurity region.
Injecting the conductivity crystal ions,
Implanting ions having a range selected to locate the peak concentration of the sub-surface impurity region at 25-50 nm below the substrate.
Forming the sub-surface impurity region of the enhanced doping,
Etching a recess into the surface of the semiconductor substrate using the mask as an etch mask;
Doping the semiconductor substrate at the bottom of the recess using the mask as a doping mask; And
Epitaxially growing a layer of substantially undoped semiconductor material to fill the recess
Method of manufacturing a MOS device comprising a.
Doping the semiconductor material,
And implanting the semiconductor substrate using the mask as an ion implantation mask.
Forming the gate electrode,
Cleaning a portion of the surface exposed by the mask;
Depositing a layer of gate insulating material over the surface;
Depositing a layer of gate electrode material over the layer of gate insulating material; And
Removing the gate electrode material over the mask
Method of manufacturing a MOS device comprising a.
Depositing the layer of gate insulating material comprises depositing a layer of insulating material having a high dielectric constant and depositing the layer of gate electrode material comprises depositing a metal layer. The method of manufacturing the Morse device.
Etching a recess into the surface of the semiconductor substrate using the mask as an etch mask to recess the surface in the gate region
The method of manufacturing a Morse device further comprising.
A gate electrode on the semiconductor substrate;
Spaced apart source and drain regions aligned with the gate electrode and formed in the semiconductor substrate; And
An impurity doped channel region under the gate electrode and spaced apart from the source and drain regions
Morse device comprising a.
Priority Applications (1)
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KR1020120040582A KR20120120038A (en) | 2011-04-20 | 2012-04-18 | Mos semiconductor device and methods for its fabrication |
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US13/091,003 | 2011-04-20 | ||
KR1020120040582A KR20120120038A (en) | 2011-04-20 | 2012-04-18 | Mos semiconductor device and methods for its fabrication |
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KR1020120040582A KR20120120038A (en) | 2011-04-20 | 2012-04-18 | Mos semiconductor device and methods for its fabrication |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116959993A (en) * | 2023-09-21 | 2023-10-27 | 联和存储科技(江苏)有限公司 | NAND flash memory device, high-voltage operation transistor and manufacturing method thereof |
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2012
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN116959993A (en) * | 2023-09-21 | 2023-10-27 | 联和存储科技(江苏)有限公司 | NAND flash memory device, high-voltage operation transistor and manufacturing method thereof |
CN116959993B (en) * | 2023-09-21 | 2024-01-02 | 联和存储科技(江苏)有限公司 | NAND flash memory device, high-voltage operation transistor and manufacturing method thereof |
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