US20070194376A1 - MOS transistors and methods of manufacturing the same - Google Patents
MOS transistors and methods of manufacturing the same Download PDFInfo
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- US20070194376A1 US20070194376A1 US11/788,710 US78871007A US2007194376A1 US 20070194376 A1 US20070194376 A1 US 20070194376A1 US 78871007 A US78871007 A US 78871007A US 2007194376 A1 US2007194376 A1 US 2007194376A1
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- 238000000034 method Methods 0.000 title abstract description 35
- 238000004519 manufacturing process Methods 0.000 title abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 44
- 239000012535 impurity Substances 0.000 claims abstract description 34
- 125000006850 spacer group Chemical group 0.000 claims abstract description 20
- 125000001475 halogen functional group Chemical group 0.000 claims abstract description 14
- 239000004065 semiconductor Substances 0.000 claims abstract description 8
- 150000002500 ions Chemical class 0.000 claims description 40
- 238000002955 isolation Methods 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052785 arsenic Inorganic materials 0.000 claims description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims 1
- 229910052796 boron Inorganic materials 0.000 claims 1
- 238000007669 thermal treatment Methods 0.000 description 4
- 238000005530 etching Methods 0.000 description 2
- 229910021332 silicide Inorganic materials 0.000 description 2
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 2
- -1 BF2 ions Chemical class 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
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- 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
- H01L29/68—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
-
- 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
- H01L29/66568—Lateral single gate silicon transistors
- H01L29/66575—Lateral single gate silicon transistors where the source and drain or source and drain extensions are self-aligned to the sides of the gate
- H01L29/6659—Lateral single gate silicon transistors where the source and drain or source and drain extensions are self-aligned to the sides of the gate with both lightly doped source and drain extensions and source and drain self-aligned to the sides of the gate, e.g. lightly doped drain [LDD] MOSFET, double diffused drain [DDD] MOSFET
-
- 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
- H01L29/68—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
- H01L29/7833—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's
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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
- H01L21/26586—Bombardment with radiation with high-energy radiation producing ion implantation characterised by the angle between the ion beam and the crystal planes or the main crystal 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
- H01L29/02—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
- H01L29/1045—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 the doping structure being parallel to the channel length, e.g. DMOS like
-
- 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
- H01L29/6656—Unipolar field-effect transistors with an insulated gate, i.e. MISFET using multiple spacer layers, e.g. multiple sidewall spacers
Definitions
- the present disclosure relates generally to semiconductor fabrication, and more particularly, to MOS transistors and methods of manufacturing the same.
- FIGS. 1A to 1 E are cross sectional views illustrating a prior art method of manufacturing a conventional MOS transistor.
- an active region where a MOS transistor is to be formed is defined by forming isolation layers 110 in a p-type semiconductor substrate 100 .
- a gate insulating pattern 120 and a gate 130 are sequentially formed on the active region of the substrate 100 .
- the active region under the gate 130 serves as a channel region.
- a first ion implanting process is performed to form halo impurity regions 141 in a vicinity of the channel region under the gate 130 .
- the halo impurity regions 141 are formed in the first ion implanting process by implanting p-type impurities in a tilted direction (the directions of the arrows in FIG. 1B ) with respect to the substrate 100 .
- a second ion implanting process is performed to form source/drain extension regions 142 , (i.e., lightly doped drain (LDD) regions) within the substrate 100 on opposite sides of the gate 130 .
- the second ion implanting process is performed by implanting lightly doped n-type impurities in a vertical direction (the direction of the arrows in FIG. 1C ) with respect to the substrate 100 .
- the second ion implanting process may be performed prior to the first ion implanting process.
- an oxide layer may be formed as an ion implanting buffer layer on the surface of the substrate 100 prior to the second ion implanting process.
- gate spacers 150 are formed on opposite side walls of the gate 130 .
- a third ion implanting process is performed to form source/drain regions 143 within the substrate 100 at opposite sides of the spacers 150 by implanting heavily doped n-type impurities in the vertical direction (the direction of the arrows in FIG. 1D ) with respect to the substrate 100 .
- a silicide process is then performed to form metal silicide layers 160 on the source/drain regions 143 and the gate 130 .
- the junction capacitance between the halo impurity regions 141 and the source/drain extension regions 142 reduces the switching speed.
- the junction capacitance cannot be completely removed due to the structural characteristics of the device. Therefore, there is a demand for reducing the junction capacitance as much as possible.
- FIGS. 1A to 1 E are cross sectional views illustrating a prior art method of manufacturing a conventional MOS transistor.
- FIGS. 2A to 2 E are cross sectional views illustrating a method of manufacturing a MOS transistor performed in accordance with the teachings of the present invention.
- a gate insulating layer pattern 220 and a gate 230 are sequentially formed on an active region of a p-type semiconductor substrate 200 .
- the active region is defined in the substrate 200 by isolation layers 210 .
- Gate spacers 260 are formed on side walls of the gate 230 .
- the active region under the gate 230 serves as a channel region.
- First, n-type, source/drain extension regions 251 are formed within the substrate 200 on opposite sides of the gate 230 .
- n-type, source/drain extension regions 252 (i.e., second LDD regions) having a higher impurity concentration than the first source/drain extension regions 251 are formed under the first source/drain extension regions 251 .
- P-type halo impurity regions 253 are formed within the substrate 220 under respective edges of the gate 230 , (i.e., at the edges of the channel region) adjacent the second source/drain extension regions 252 .
- N-type source/drain regions 254 are formed within the substrate 200 on opposite sides of the spacers 260 .
- a buffer oxide layer 240 is formed between the gate 230 and the spacers 260 .
- each of the source/drain extension regions has a combined structure including the first and second source/drain extension regions 251 , 252 .
- each of the source/drain extension regions has a graded junction structure, since the impurity concentrations of the first and second source/drain extension regions 251 , 252 are different from each other. Therefore, it is possible to reduce the junction capacitance between the halo impurity regions 253 and the source/drain extension regions 251 , 252 .
- a gate insulating layer pattern 220 and a gate conductive layer 230 are sequentially formed on an active region of a p-type semiconductor substrate 200 .
- the active region is defined in the substrate 200 by isolation layers 210 .
- the portion of the active region located under the gate 230 serves as a channel region.
- the gate insulating layer pattern 220 is formed of an oxide layer and the gate 230 is formed of a polysilicon layer.
- an ion implanting buffer layer 240 is formed on the entire surface of the substrate 200 .
- the ion implanting buffer layer 240 is formed of an oxide layer.
- a first ion implanting process is performed to form first source/drain extension regions 251 within the substrate 200 on opposite sides of the gate 230 .
- the first ion implanting process is performed by implanting lightly doped n-type first impurities in a substantially vertical direction with respect to the substrate 200 (i.e., in the direction of the arrows in FIG. 2B ).
- the first ion implanting process is performed at an implanting energy of about 5 to 50 keV and a concentration of about 1 ⁇ 10 14 to 1 ⁇ 10 15 ions/cm 2 using arsenic (As) ions as the first impurities.
- a second ion impurity process is performed to form second source/drain extension regions 252 under the first source/drain extension regions 251 .
- the second ion impurity process is performed by implanting n-type second impurities having a higher impurity concentration than the first impurities in a substantially vertical direction with respect to the substrate 200 (i.e., in the direction of the arrows in FIG. 2C ).
- the second ion implanting process is performed at an implanting energy of about 10 to 50 keV and a concentration of about 5 ⁇ 10 13 to 5 ⁇ 10 14 ions/cm 2 using phosphorus (P) ions as the second impurities.
- a third ion implanting process is performed to form halo impurity regions 253 within the substrate 200 under the edges of the gate 230 .
- the third ion implanting process is performed by implanting p-type third impurities in a tilted direction with respect to the substrate 200 (i.e., in the direction of the arrows in FIG. 2D ).
- the third ion implanting process is performed at an implanting energy of about 5 to 50 keV and a concentration of about 1 ⁇ 10 14 to 5 ⁇ 10 15 ions/cm 2 using BF 2 ions as the third impurities.
- the third ion implanting process is performed at a tilt angle of about 20 to 30 degree.
- the first, second, and third impurities are diffused by performing a first thermal treatment process.
- the first thermal treatment process is performed at a temperature of about 800 to 1000° C. in an N 2 ambience for about 10 to 30 seconds by a rapid thermal process (RTP).
- RTP rapid thermal process
- gate spacers 260 are formed on the ion implanting buffer layer 240 at side walls of the gate 230 .
- the gate spacers 260 of the illustrated example are formed by depositing a spacer insulating layer such as a nitride layer on the entire surface of the substrate 200 and etching the spacer insulating layer with an anisotropic etching method such as an etch-back method.
- a fourth ion implanting process and a second thermal treatment process are performed to form source/drain regions 254 within the substrate 200 on opposite sides of the gate spacer 260 .
- the fourth ion implanting process is performed by implanting heavily doped n-type fourth impurities in a substantially vertical direction with respect to the substrate 200 (i.e., in the direction of the arrows in FIG. 2E ).
- the second thermal treatment process is performed at a temperature of about 900 to 1050° C. in an N 2 ambience for about 10 to 30 seconds by an RTP.
- the source/drain extension regions 251 , 252 have a combined structure of first source/drain extension regions 251 and second source/drain extension regions 252 .
- the second source/drain extension regions 252 have a higher impurity concentration than the first source/drain extension regions 251 .
- the combined structure of the first and second source/drain regions 251 , 252 forms a graded junction structure where the impurity concentrations are different in different areas of the structure.
- the junction capacitance between the halo impurity regions 253 and the source/drain extension regions 251 , 252 is reduced, and the switching speed of the device can, thus, be increased.
- MOS transistors having low junction capacitance between the halo regions 253 and the source/drain extension regions 251 , 252 have been disclosed. Methods of manufacturing such MOS transistors have also been disclosed.
- a disclosed example MOS transistor comprises: a semiconductor substrate of a first conductivity type; a gate insulating layer pattern and a gate on an active region of the substrate; spacers on side walls of the gate; source/drain extension regions of a second conductivity type formed within the substrate on opposite sides of the gate, the source/drain extension regions having a graded junction structure; halo impurity regions of the first conductivity type formed within the substrate under edges of the gate so as to surround the source/drain extension regions; and source/drain regions of the second conductivity type formed within the substrate on opposite sides of the spacers.
- a disclosed example method of manufacturing a MOS transistor comprises: forming a gate insulating layer pattern and a gate on an active region of a semiconductor substrate of a first conductivity type; forming first source/drain extension regions of a second conductivity type within the substrate on opposite sides of the gate by performing a first ion implanting process; forming second source/drain extension regions of the second conductivity type within the substrate under the first source/drain extension regions by performing a second ion implanting process; forming halo impurity regions of the first conductivity type within the substrate under edges of the gate by performing a third ion implanting process; forming spacers on side walls of the gate; and forming source/drain regions of the second conductivity type within the substrate on opposite sides of the spacers by performing a fourth ion implanting process.
Abstract
MOS transistors having a low junction capacitance between their halo regions and their source/drain extension regions and methods for manufacturing the same are disclosed. A disclosed MOS transistor includes: a semiconductor substrate of a first conductivity type; a gate insulating layer pattern and a gate on an active region of the substrate; spacers on side walls of the gate; source/drain extension regions of a second conductivity type within the substrate on opposite sides of the gate, the source/drain extension regions having a graded junction structure; halo impurity regions of the first conductivity type within the substrate under opposite edges of the gate adjacent respective ones of the source/drain extension regions; and source/drain regions of the second conductivity type within the substrate on opposite sides of the spacer.
Description
- This application is a divisional of U.S. patent application Ser. No. 11/022,611, filed Dec. 23, 2003, pending.
- The present disclosure relates generally to semiconductor fabrication, and more particularly, to MOS transistors and methods of manufacturing the same.
-
FIGS. 1A to 1E are cross sectional views illustrating a prior art method of manufacturing a conventional MOS transistor. Referring toFIG. 1A , an active region where a MOS transistor is to be formed is defined by formingisolation layers 110 in a p-type semiconductor substrate 100. Next, agate insulating pattern 120 and agate 130 are sequentially formed on the active region of thesubstrate 100. The active region under thegate 130 serves as a channel region. - Referring to
FIG. 1B , in order to reduce the short channel effect, a first ion implanting process is performed to formhalo impurity regions 141 in a vicinity of the channel region under thegate 130. Thehalo impurity regions 141 are formed in the first ion implanting process by implanting p-type impurities in a tilted direction (the directions of the arrows inFIG. 1B ) with respect to thesubstrate 100. - Referring to
FIG. 1C , a second ion implanting process is performed to form source/drain extension regions 142, (i.e., lightly doped drain (LDD) regions) within thesubstrate 100 on opposite sides of thegate 130. The second ion implanting process is performed by implanting lightly doped n-type impurities in a vertical direction (the direction of the arrows inFIG. 1C ) with respect to thesubstrate 100. In some cases, the second ion implanting process may be performed prior to the first ion implanting process. In addition, although not shown in the figure, an oxide layer may be formed as an ion implanting buffer layer on the surface of thesubstrate 100 prior to the second ion implanting process. - Referring to
FIG. 1D ,gate spacers 150 are formed on opposite side walls of thegate 130. Next, a third ion implanting process is performed to form source/drain regions 143 within thesubstrate 100 at opposite sides of thespacers 150 by implanting heavily doped n-type impurities in the vertical direction (the direction of the arrows inFIG. 1D ) with respect to thesubstrate 100. - Referring to
FIG. 1E , a silicide process is then performed to formmetal silicide layers 160 on the source/drain regions 143 and thegate 130. - In a conventional MOS transistor, (e.g., a transistor used as a logic device), the junction capacitance between the
halo impurity regions 141 and the source/drain extension regions 142 reduces the switching speed. However, the junction capacitance cannot be completely removed due to the structural characteristics of the device. Therefore, there is a demand for reducing the junction capacitance as much as possible. -
FIGS. 1A to 1E are cross sectional views illustrating a prior art method of manufacturing a conventional MOS transistor. -
FIGS. 2A to 2E are cross sectional views illustrating a method of manufacturing a MOS transistor performed in accordance with the teachings of the present invention. - An example MOS transistor constructed in accordance with the teachings of the present invention will now be described with reference to
FIG. 2E . Referring toFIG. 2E , a gateinsulating layer pattern 220 and agate 230 are sequentially formed on an active region of a p-type semiconductor substrate 200. The active region is defined in thesubstrate 200 byisolation layers 210.Gate spacers 260 are formed on side walls of thegate 230. The active region under thegate 230 serves as a channel region. First, n-type, source/drain extension regions 251, (i.e., first LDD regions) are formed within thesubstrate 200 on opposite sides of thegate 230. Second, n-type, source/drain extension regions 252, (i.e., second LDD regions) having a higher impurity concentration than the first source/drain extension regions 251 are formed under the first source/drain extension regions 251. P-typehalo impurity regions 253 are formed within thesubstrate 220 under respective edges of thegate 230, (i.e., at the edges of the channel region) adjacent the second source/drain extension regions 252. N-type source/drain regions 254 are formed within thesubstrate 200 on opposite sides of thespacers 260. - In the illustrated example, a
buffer oxide layer 240 is formed between thegate 230 and thespacers 260. - As described above, each of the source/drain extension regions has a combined structure including the first and second source/
drain extension regions drain extension regions halo impurity regions 253 and the source/drain extension regions - Next, an example method of manufacturing the above described MOS transistor will be described with reference to
FIGS. 2A to 2E. Referring toFIG. 2A , a gateinsulating layer pattern 220 and a gateconductive layer 230 are sequentially formed on an active region of a p-type semiconductor substrate 200. The active region is defined in thesubstrate 200 byisolation layers 210. The portion of the active region located under thegate 230 serves as a channel region. In the illustrated example, the gateinsulating layer pattern 220 is formed of an oxide layer and thegate 230 is formed of a polysilicon layer. - Next, an ion
implanting buffer layer 240 is formed on the entire surface of thesubstrate 200. In the illustrated example, the ionimplanting buffer layer 240 is formed of an oxide layer. - Referring to
FIG. 2B , a first ion implanting process is performed to form first source/drain extension regions 251 within thesubstrate 200 on opposite sides of thegate 230. The first ion implanting process is performed by implanting lightly doped n-type first impurities in a substantially vertical direction with respect to the substrate 200 (i.e., in the direction of the arrows inFIG. 2B ). In the illustrated example, the first ion implanting process is performed at an implanting energy of about 5 to 50 keV and a concentration of about 1×1014 to 1×1015 ions/cm2 using arsenic (As) ions as the first impurities. - Referring to
FIG. 2C , a second ion impurity process is performed to form second source/drain extension regions 252 under the first source/drain extension regions 251. The second ion impurity process is performed by implanting n-type second impurities having a higher impurity concentration than the first impurities in a substantially vertical direction with respect to the substrate 200 (i.e., in the direction of the arrows inFIG. 2C ). The second ion implanting process is performed at an implanting energy of about 10 to 50 keV and a concentration of about 5×1013 to 5×1014 ions/cm2 using phosphorus (P) ions as the second impurities. - Referring to
FIG. 2D , a third ion implanting process is performed to formhalo impurity regions 253 within thesubstrate 200 under the edges of thegate 230. The third ion implanting process is performed by implanting p-type third impurities in a tilted direction with respect to the substrate 200 (i.e., in the direction of the arrows inFIG. 2D ). In the illustrated example, the third ion implanting process is performed at an implanting energy of about 5 to 50 keV and a concentration of about 1×1014 to 5×1015 ions/cm2 using BF2 ions as the third impurities. In the illustrated example, the third ion implanting process is performed at a tilt angle of about 20 to 30 degree. - Next, the first, second, and third impurities are diffused by performing a first thermal treatment process. In the illustrated example, the first thermal treatment process is performed at a temperature of about 800 to 1000° C. in an N2 ambience for about 10 to 30 seconds by a rapid thermal process (RTP).
- Referring to
FIG. 2E ,gate spacers 260 are formed on the ion implantingbuffer layer 240 at side walls of thegate 230. The gate spacers 260 of the illustrated example are formed by depositing a spacer insulating layer such as a nitride layer on the entire surface of thesubstrate 200 and etching the spacer insulating layer with an anisotropic etching method such as an etch-back method. - Next, a fourth ion implanting process and a second thermal treatment process are performed to form source/
drain regions 254 within thesubstrate 200 on opposite sides of thegate spacer 260. The fourth ion implanting process is performed by implanting heavily doped n-type fourth impurities in a substantially vertical direction with respect to the substrate 200 (i.e., in the direction of the arrows inFIG. 2E ). In the illustrated example, the second thermal treatment process is performed at a temperature of about 900 to 1050° C. in an N2 ambience for about 10 to 30 seconds by an RTP. - As described above, the source/
drain extension regions drain extension regions 251 and second source/drain extension regions 252. The second source/drain extension regions 252 have a higher impurity concentration than the first source/drain extension regions 251. Thus, the combined structure of the first and second source/drain regions halo impurity regions 253 and the source/drain extension regions - Persons of ordinary skill in the art will readily appreciate that, although the n-channel MOS transistor is described above, the methods disclosed herein can easily be adapted to fabricate a p-channel MOS transistor.
- From the foregoing, persons of ordinary skill in the art will readily appreciate that MOS transistors having low junction capacitance between the
halo regions 253 and the source/drain extension regions - A disclosed example MOS transistor comprises: a semiconductor substrate of a first conductivity type; a gate insulating layer pattern and a gate on an active region of the substrate; spacers on side walls of the gate; source/drain extension regions of a second conductivity type formed within the substrate on opposite sides of the gate, the source/drain extension regions having a graded junction structure; halo impurity regions of the first conductivity type formed within the substrate under edges of the gate so as to surround the source/drain extension regions; and source/drain regions of the second conductivity type formed within the substrate on opposite sides of the spacers.
- A disclosed example method of manufacturing a MOS transistor comprises: forming a gate insulating layer pattern and a gate on an active region of a semiconductor substrate of a first conductivity type; forming first source/drain extension regions of a second conductivity type within the substrate on opposite sides of the gate by performing a first ion implanting process; forming second source/drain extension regions of the second conductivity type within the substrate under the first source/drain extension regions by performing a second ion implanting process; forming halo impurity regions of the first conductivity type within the substrate under edges of the gate by performing a third ion implanting process; forming spacers on side walls of the gate; and forming source/drain regions of the second conductivity type within the substrate on opposite sides of the spacers by performing a fourth ion implanting process.
- It is noted that this patent claims priority from Korean Patent Application Serial Number 10-2003-0098385, which was filed on Dec. 27, 2003, and is hereby incorporated by reference in its entirety.
- Although certain example methods, apparatus and articles of manufacture have been described herein, the scope of coverage of this patent is not limited thereto. On the contrary, this patent covers all methods, apparatus and articles of manufacture fairly falling within the scope of the appended claims either literally or under the doctrine of equivalents.
Claims (13)
1. A MOS transistor comprising:
a semiconductor substrate of a first conductivity type;
a gate insulating layer pattern and a gate on an active region of the substrate defined by an isolation layer;
spacers on side walls of the gate;
an ion implanting buffer layer between the gate and the spacers;
source/drain extension regions of a second conductivity type within the substrate on opposite sides of the gate, the source/drain extension regions having a graded junction structure;
halo impurity regions of the first conductivity type within the substrate under opposite edges of the gate adjacent respective ones of the source/drain extension regions; and
source/drain regions of the second conductivity type within the substrate on opposite sides of the spacers.
2. A MOS transistor as defined in claim 1 , wherein each of the source/drain extension regions includes a first source/drain extension region and a second source/drain extension region under the first source/drain extension region.
3. A MOS transistor as defined in claim 2 , wherein the second source/drain extension region has a higher impurity concentration than the first source/drain extension region.
4. A MOS transistor as defined in claim 1 , wherein the first conductivity type is an n-type and the second conductivity type is a p-type.
5. A MOS transistor as defined in claim 1 , wherein the first conductivity type is a p-type and the second conductivity type is an n-type.
6. A MOS transistor as defined in claim 1 , wherein the halo impurity regions has an impurity concentration of about 1×1014 to 1×1015 ions/cm2.
7. A MOS transistor as defined in claim 6 , wherein the impurity comprises boron (B).
8. A MOS transistor as defined in claim 1 , wherein the ion implanting buffer layer comprises an oxide layer.
9. A MOS transistor as defined in claim 1 , wherein the ion implanting buffer layer is also on part of the active region under the spacer.
10. A MOS transistor as defined in claim 1 , wherein the ion implanting buffer layer is also on the gate.
11. A MOS transistor as defined in claim 1 , wherein each of the source/drain extension regions has a graded junction structure.
12. A MOS transistor as defined in claim 2 , wherein the first source/drain extension region has a concentration of about 5×1013 to 5×1014 arsenic (As) ions/cm2.
13. A MOS transistor as defined in claim 2 , wherein the second source/drain extension region has a concentration of about 1×1014 to 5×1015 phosphorus (P) ions/cm2.
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KR1020030098385A KR100562303B1 (en) | 2003-12-27 | 2003-12-27 | MOS transistor having low junction capacitance and method for fabricating the same |
KR10-2003-0098385 | 2003-12-27 | ||
US11/022,611 US7223663B2 (en) | 2003-12-27 | 2004-12-27 | MOS transistors and methods of manufacturing the same |
US11/788,710 US20070194376A1 (en) | 2003-12-27 | 2007-04-20 | MOS transistors and methods of manufacturing the same |
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Cited By (1)
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US20050255660A1 (en) * | 2004-05-17 | 2005-11-17 | Mosel Vitelic, Inc. | Ion implantation method for forming a shallow junction |
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US7646053B2 (en) * | 2007-10-10 | 2010-01-12 | Micron Technology, Inc. | Memory cell storage node length |
US8283708B2 (en) * | 2009-09-18 | 2012-10-09 | Micron Technology, Inc. | Semiconductor devices and methods of forming semiconductor devices having diffusion regions of reduced width |
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Also Published As
Publication number | Publication date |
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US20050139875A1 (en) | 2005-06-30 |
KR100562303B1 (en) | 2006-03-22 |
KR20050066901A (en) | 2005-06-30 |
US7223663B2 (en) | 2007-05-29 |
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