US20080258145A1 - Semiconductor Devices Including an Amorphous Region in an Interface Between a Device Isolation Layer and a Source/Drain Diffusion Layer - Google Patents
Semiconductor Devices Including an Amorphous Region in an Interface Between a Device Isolation Layer and a Source/Drain Diffusion Layer Download PDFInfo
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- US20080258145A1 US20080258145A1 US12/102,819 US10281908A US2008258145A1 US 20080258145 A1 US20080258145 A1 US 20080258145A1 US 10281908 A US10281908 A US 10281908A US 2008258145 A1 US2008258145 A1 US 2008258145A1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 73
- 238000002955 isolation Methods 0.000 title claims abstract description 47
- 238000009792 diffusion process Methods 0.000 title description 2
- 229910021332 silicide Inorganic materials 0.000 claims abstract description 42
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000000758 substrate Substances 0.000 claims description 37
- 150000002500 ions Chemical class 0.000 claims description 11
- 239000003870 refractory metal Substances 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 150000004767 nitrides Chemical class 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 32
- 239000010410 layer Substances 0.000 description 132
- 238000007254 oxidation reaction Methods 0.000 description 13
- 230000003647 oxidation Effects 0.000 description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000151 deposition Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 229920002120 photoresistant polymer Polymers 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 229910021419 crystalline silicon Inorganic materials 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table 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
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- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table
- H01L21/28518—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table the conductive layers comprising silicides
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823878—Complementary field-effect transistors, e.g. CMOS isolation region manufacturing related aspects, e.g. to avoid interaction of isolation region with adjacent structure
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- 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
- H01L29/08—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 carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/0843—Source or drain regions of field-effect devices
- H01L29/0847—Source or drain regions of field-effect devices of field-effect transistors with insulated gate
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- 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
- H01L29/665—Unipolar field-effect transistors with an insulated gate, i.e. MISFET using self aligned silicidation, i.e. salicide
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- 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
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- 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
Definitions
- the present disclosure relates generally to semiconductor fabrication, and more particularly, to semiconductor devices and methods for fabricating the same which achieve enhanced quality by decreasing a leakage current associated with a silicide layer formed in an interface between a device isolation layer and a source/drain diffusion layer.
- FIG. 1 is a cross sectional view of a prior art thin film transistor.
- a prior art semiconductor device includes an active region AR and a field region FR in a silicon semiconductor substrate 1 .
- a device isolation layer 2 is formed in the field region FR.
- the device isolation layer 2 may be formed in an LOCOS process by forming an oxidation-resistant insulating layer in the field region FR, and by selectively performing a thermal-oxidation process on the oxidation-resistant insulating layer.
- the device isolation layer 2 may be formed in a sequential process of forming an oxidation-resistant insulating layer in the active region AR, forming a trench by selectively removing the semiconductor substrate in the field region FR, forming an oxide layer to fill the trench, and selectively removing the oxide layer to expose the surface of the semiconductor substrate by a CMP process, wherein the device isolation layer 2 is formed in the trench.
- the semiconductor device for example, the thin film transistor 10
- the thin film transistor 10 is formed in the active region AR. That is, the thin film transistor 10 is formed with a gate insulating layer 11 and a gate electrode 12 , by sequentially depositing and selectively removing portions of the gate insulating layer 11 and a conductive layer on the semiconductor substrate 1 .
- an insulating layer is deposited on the entire surface of the semiconductor substrate 1 .
- This insulating layer is anisotropically etched to form sidewall-insulating layers 13 on opposite sidewalls of the gate electrode 12 .
- impurity ions are implanted into the active region AR of the semiconductor substrate 1 on opposite sides of the gate electrode 12 while using the gate electrode 12 and the sidewall-insulating layers 13 as a mask to thereby form source/drain regions 14 .
- a metal line (not shown) is formed on the semiconductor substrate 1 .
- a silicide layer 15 is then formed on the surfaces of the source/drain regions 14 to enhance the electric contact with the source/drain regions 14 .
- the silicide layer 15 is formed in a sequential process of depositing a refractory metal on the entire surface of the semiconductor substrate 1 , and then performing a thermal process thereon. As a result, the silicide layer 15 is formed on the surface of the source/drain regions 14 at an interface between the silicon semiconductor substrate 1 and the refractory metal. If the gate electrode 12 is formed of silicon, the silicide layer 15 is also formed on the surface of the gate electrode 12 .
- a silicide layer 15 a is also formed in the interfaces between the device isolation layers 2 and the source/drain regions 14 . That is, ions of the refractory metal penetrate into the interfaces between the device isolation layers 2 and the source/drain regions 14 . As a result, silicide layers 15 a are formed in the interfaces between the device isolation layers 2 and the source/drain regions 14 .
- the device isolation layer 2 and the source/drain regions 14 are formed of different materials, at different thickness, and in different surface states. Therefore, it is difficult to maintain a uniform thickness of the silicide layers 15 a formed in the interfaces between the device isolation layers 2 and the source/drain regions 14 without an additional process. Furthermore, the silicide layers 15 a formed in the interfaces between the device isolation layers 2 and the source/drain regions 14 may cause a leakage current, thereby deteriorating the quality of the resulting semiconductor device.
- FIG. 1 is a cross sectional view of a prior art semiconductor device.
- FIG. 2 is a cross sectional view illustrating an example semiconductor device constructed in accordance with the teachings of the present invention.
- FIG. 3A to FIG. 3F are cross sectional views illustrating an example fabrication process performed in accordance with the teachings of the present invention.
- FIG. 2 is a cross sectional view illustrating an example semiconductor device constructed in accordance with the teachings of the present invention.
- the semiconductor device includes a silicon semiconductor substrate 21 having an active region AR and field regions FR.
- Device isolation layers 22 are formed in the field regions FR.
- the device isolation layers 22 may be formed in a LOCOS process by forming oxidation-resistant insulating layers in the field regions FR, and by selectively performing a thermal-oxidation process on the oxidation-resistant insulating layers.
- the device isolation layers 22 may be formed by sequentially forming oxidation-resistant insulating layers in the active regions AR, forming trenches by selectively removing the semiconductor substrate 21 in the field regions FR, forming an oxide layer to fill the trenches, and selectively removing the oxide layer by a CMP process to expose the surface of the semiconductor substrate 21 , wherein the device isolation layers 22 are formed in the trenches.
- a transistor 30 is formed in the active region AR of the semiconductor substrate 21 to selectively switch the flow of electric charges.
- the transistor 30 includes a gate insulating layer 31 on the semiconductor substrate 21 , a gate electrode 32 on the gate insulating layer 31 , sidewall-insulating layers 33 on opposite sidewalls of the gate electrode 32 , and source/drain regions 34 in the active region of the semiconductor substrate 21 on opposite sides of the gate electrode 32 .
- the source/drain regions 34 have amorphous structures 41 in the portions adjacent to the device isolation layers 22 . Also, silicide layers 35 are formed on the surfaces of the source/drain regions 34 to improve the electric contact with metal lines (not shown). Furthermore, silicide layers 35 a are thinly and uniformly formed in the interfaces between the device isolation layers 22 and the source/drain regions 34 .
- the silicide layers formed in an amorphous silicon substrate are formed more thinly and uniformly. Further, the mobility of electric charges in the crystalline silicon layer is greater than the mobility of electric charges in the amorphous silicon substrate. Accordingly, the source/drain regions 34 adjacent to the device isolation layers 22 are formed as amorphous layers 41 , so that the silicide layers 35 a at the interfaces between the device isolation layers 22 and the source/drain regions 34 are thinner and more uniform than in the prior art.
- amorphous layers 41 in the interfaces between the device isolation layers 22 and the source/drain regions 34 is preferable to form the amorphous layers 41 in the interfaces between the device isolation layers 22 and the source/drain regions 34 at a thickness between about 1 ⁇ m and 5 ⁇ m.
- the silicide layers 35 a formed in the interfaces between the device isolation layers 22 and the source/drain regions 34 , are thin and uniform. Consequently, it is possible to decrease the leakage current of the silicide layers 35 a . Also, the entire semiconductor device has a constant leakage current, thereby enhancing the quality of the semiconductor device.
- FIG. 3 a to FIG. 3F are cross sectional views illustrating the example fabrication process.
- an oxidation-resistant insulating layer 101 is formed on an entire surface of a semiconductor substrate 21 .
- the semiconductor substrate 21 includes an active region AR and field regions FR.
- the oxidation-resistant insulating layer 101 of the field region FR is selectively removed by photolithography.
- the oxidation-resistant insulating layer 101 may be formed of a nitride layer, or a deposition layer including an oxide layer and a nitride layer.
- Trenches are formed in the field regions FR by selectively etching the field regions FR of the semiconductor substrate 21 .
- the device isolation layer 22 is formed in the trench by sequentially performing an insulating layer gap filling process and a CMP process. These processes are collectively referred to as an STI (shallow trench isolation) process.
- the device isolation layer 22 may be formed in an LOCOS (local oxidation of silicon) process. Then, the oxidation-resistant insulating layer 101 is removed.
- a gate insulating layer 31 and a conductive layer are sequentially deposited on the semiconductor substrate 22 . Portions of the gate insulating layer 31 and the conductive layer are then selectively removed by photolithography to thereby form the gate insulating layer 31 and the gate electrode 32 in the active region AR.
- an oxide layer or a nitride layer is deposited on the entire surface of the semiconductor substrate 21 including on the gate electrode 32 .
- the oxide layer or the nitride layer is etched by a dry-etch process having anisotropic etching characteristics or by a reactive ion etching process to thereby form sidewall insulating layers 33 on the sidewalls of the gate electrode 32 .
- highly doped impurity ions are implanted into the semiconductor substrate 21 of the active region AR while using the sidewall insulating layers 33 and the gate electrode 32 as a mask.
- the source/drain regions 34 are formed on opposite sides of the gate electrode 32 in the active region AR of the semiconductor substrate 21 .
- lightly doped impurity ions may be implanted into the active region AR of the semiconductor substrate 21 on opposite sides of the gate electrode 32 while using the gate electrode 32 as a mask to thereby form the sidewall insulating layers 33 .
- highly doped impurity ions may be implanted into the active region AR of the semiconductor substrate 21 while using the gate electrode 32 and the sidewall insulating layers 33 as a mask to thereby form the source/drain regions 34 .
- a photoresist layer 102 is deposited on the entire surface of the semiconductor substrate 21 .
- the photoresist layer is patterned to expose the source/drain regions 34 adjacent to the device isolation layers 22 by an exposure and development process using a mask.
- the amorphous layer 41 is formed in the source/drain regions 34 adjacent to the device isolation layers 22 .
- the amorphous layers 41 have a predetermined thickness between about 1 ⁇ m and about 5 ⁇ m.
- Ge+ ions are used.
- a refractory metal 36 of tungsten or titanium is deposited on the entire surface of the semiconductor substrate 21 by sputtering. A thermal process is then performed on the resulting structure.
- a silicide layer 35 of Si X W Y or SiTi X is formed on the surface of the source/drain regions 34 in the interface between the silicon semiconductor substrate 21 and the refractory metal 36 . If the gate electrode 32 is formed of silicon, the silicide layer is also formed on the surface of the gate electrode 32 .
- the silicide layers 35 a are also formed in the interfaces between the device isolation layers 22 and the source/drain regions 34 .
- the source/drain regions 34 adjacent to the device isolation layers 22 are formed as amorphous layers 41 . Consequently, the silicide layers 35 a are thinly formed in the interfaces between the device isolation layers 22 and the source/drain regions 34 due to the amorphous layer 41 . Since the leakage current of the silicide layers 35 a is in proportion to the thickness of the silicide layers 35 a , it is possible to decrease the leakage current of the silicide layers 35 a by decreasing the thickness of the silicide layers 35 a.
- the conventional processes of forming an insulating interlayer (not shown), forming a contact hole (not shown), and forming the metal line (not shown) are sequentially performed, to thereby complete the semiconductor device.
- the illustrated semiconductor device includes amorphous layers formed in the source/drain regions 14 adjacent the device isolation layers 22 .
- the presence of these amorphous layers 41 stably thins the silicide layers 35 a .
- An illustrated example semiconductor device includes a semiconductor substrate having an active region and a field region; a device isolation layer in the field region; a gate electrode on the active region; source/drain regions in the active region on opposite sides of the gate electrode; and an amorphous layer in the source or drain region adjacent the device isolation layer.
- the amorphous layer is formed at a thickness between about 1 ⁇ m and 5 ⁇ m.
- the illustrated semiconductor device includes a silicide layer on the surface of the source/drain regions.
- An illustrated example method for fabricating a semiconductor device includes forming a device isolation layer in a field region of a semiconductor substrate to define an active region; forming a gate electrode on the active region; forming source/drain regions in the active region on opposite sides of the gate electrode; implanting ions to form an amorphous layer in the source or drain region adjacent to the device isolation layer; and forming a silicide layer on the surface of the source/drain regions.
- the implanted ions are Ge + ions.
- forming the silicide layer on the surface of the source/drain regions comprises depositing a refractory metal on an entire surface of the semiconductor substrate, and performing a thermal process to form a silicide layer in an interface between the refractory metal and the source or drain region.
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Abstract
Semiconductor devices and methods for fabricating the same are disclosed in which an amorphous layer is formed in an interface between a device isolation layer and a source or drain region to stably thin a silicide layer formed in the interface. A leakage current of the silicide layer formed in the interface between the device isolation layer and the source/drain region is reduced.
Description
- This application is a divisional of U.S. patent application Ser. No. 11/027,362, filed Dec. 29, 2004 (Attorney Docket No. OPP-GZ-2004-0007-US-00), pending, which is incorporated herein by reference in its entirety. This application also claims the benefit of Korean Application No. P2003-100706, filed on Dec. 30, 2003, which is hereby incorporated by reference in its entirety.
- The present disclosure relates generally to semiconductor fabrication, and more particularly, to semiconductor devices and methods for fabricating the same which achieve enhanced quality by decreasing a leakage current associated with a silicide layer formed in an interface between a device isolation layer and a source/drain diffusion layer.
- Due to a recent trend toward high integration in semiconductor memory devices and CMOS image sensors, geometric structures in these semiconductor devices and components therein have necessarily changed.
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FIG. 1 is a cross sectional view of a prior art thin film transistor. As shown inFIG. 1 , a prior art semiconductor device includes an active region AR and a field region FR in a silicon semiconductor substrate 1. A device isolation layer 2 is formed in the field region FR. - The device isolation layer 2 may be formed in an LOCOS process by forming an oxidation-resistant insulating layer in the field region FR, and by selectively performing a thermal-oxidation process on the oxidation-resistant insulating layer. Alternatively, the device isolation layer 2 may be formed in a sequential process of forming an oxidation-resistant insulating layer in the active region AR, forming a trench by selectively removing the semiconductor substrate in the field region FR, forming an oxide layer to fill the trench, and selectively removing the oxide layer to expose the surface of the semiconductor substrate by a CMP process, wherein the device isolation layer 2 is formed in the trench.
- Next, the semiconductor device, for example, the
thin film transistor 10, is formed in the active region AR. That is, thethin film transistor 10 is formed with agate insulating layer 11 and agate electrode 12, by sequentially depositing and selectively removing portions of thegate insulating layer 11 and a conductive layer on the semiconductor substrate 1. - Subsequently, an insulating layer is deposited on the entire surface of the semiconductor substrate 1. This insulating layer is anisotropically etched to form sidewall-insulating
layers 13 on opposite sidewalls of thegate electrode 12. Next, impurity ions are implanted into the active region AR of the semiconductor substrate 1 on opposite sides of thegate electrode 12 while using thegate electrode 12 and the sidewall-insulatinglayers 13 as a mask to thereby form source/drain regions 14. - Next, a metal line (not shown) is formed on the semiconductor substrate 1. A
silicide layer 15 is then formed on the surfaces of the source/drain regions 14 to enhance the electric contact with the source/drain regions 14. - In the above described thin film transistor structure, the
silicide layer 15 is formed in a sequential process of depositing a refractory metal on the entire surface of the semiconductor substrate 1, and then performing a thermal process thereon. As a result, thesilicide layer 15 is formed on the surface of the source/drain regions 14 at an interface between the silicon semiconductor substrate 1 and the refractory metal. If thegate electrode 12 is formed of silicon, thesilicide layer 15 is also formed on the surface of thegate electrode 12. - However, when the thermal process is performed on the refractory metal on the entire surface of the semiconductor substrate 1 to form the
silicide layer 15 on the surface of the source/drain regions 14, asilicide layer 15 a is also formed in the interfaces between the device isolation layers 2 and the source/drain regions 14. That is, ions of the refractory metal penetrate into the interfaces between the device isolation layers 2 and the source/drain regions 14. As a result,silicide layers 15 a are formed in the interfaces between the device isolation layers 2 and the source/drain regions 14. - The device isolation layer 2 and the source/
drain regions 14 are formed of different materials, at different thickness, and in different surface states. Therefore, it is difficult to maintain a uniform thickness of thesilicide layers 15 a formed in the interfaces between the device isolation layers 2 and the source/drain regions 14 without an additional process. Furthermore, thesilicide layers 15 a formed in the interfaces between the device isolation layers 2 and the source/drain regions 14 may cause a leakage current, thereby deteriorating the quality of the resulting semiconductor device. -
FIG. 1 is a cross sectional view of a prior art semiconductor device. -
FIG. 2 is a cross sectional view illustrating an example semiconductor device constructed in accordance with the teachings of the present invention. -
FIG. 3A toFIG. 3F are cross sectional views illustrating an example fabrication process performed in accordance with the teachings of the present invention. - Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
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FIG. 2 is a cross sectional view illustrating an example semiconductor device constructed in accordance with the teachings of the present invention. In the example ofFIG. 2 , the semiconductor device includes asilicon semiconductor substrate 21 having an active region AR and field regions FR.Device isolation layers 22 are formed in the field regions FR. - The
device isolation layers 22 may be formed in a LOCOS process by forming oxidation-resistant insulating layers in the field regions FR, and by selectively performing a thermal-oxidation process on the oxidation-resistant insulating layers. Alternatively, thedevice isolation layers 22 may be formed by sequentially forming oxidation-resistant insulating layers in the active regions AR, forming trenches by selectively removing thesemiconductor substrate 21 in the field regions FR, forming an oxide layer to fill the trenches, and selectively removing the oxide layer by a CMP process to expose the surface of thesemiconductor substrate 21, wherein thedevice isolation layers 22 are formed in the trenches. - Next, a
transistor 30 is formed in the active region AR of thesemiconductor substrate 21 to selectively switch the flow of electric charges. Thetransistor 30 includes agate insulating layer 31 on thesemiconductor substrate 21, agate electrode 32 on thegate insulating layer 31, sidewall-insulatinglayers 33 on opposite sidewalls of thegate electrode 32, and source/drain regions 34 in the active region of thesemiconductor substrate 21 on opposite sides of thegate electrode 32. - The source/
drain regions 34 haveamorphous structures 41 in the portions adjacent to thedevice isolation layers 22. Also,silicide layers 35 are formed on the surfaces of the source/drain regions 34 to improve the electric contact with metal lines (not shown). Furthermore,silicide layers 35 a are thinly and uniformly formed in the interfaces between thedevice isolation layers 22 and the source/drain regions 34. - As compared with the case of forming the silicide layers in a crystalline silicon substrate, the silicide layers formed in an amorphous silicon substrate are formed more thinly and uniformly. Further, the mobility of electric charges in the crystalline silicon layer is greater than the mobility of electric charges in the amorphous silicon substrate. Accordingly, the source/
drain regions 34 adjacent to thedevice isolation layers 22 are formed asamorphous layers 41, so that thesilicide layers 35 a at the interfaces between thedevice isolation layers 22 and the source/drain regions 34 are thinner and more uniform than in the prior art. - It is preferable to form the
amorphous layers 41 in the interfaces between thedevice isolation layers 22 and the source/drain regions 34 at a thickness between about 1 μm and 5 μm. - The
silicide layers 35 a, formed in the interfaces between thedevice isolation layers 22 and the source/drain regions 34, are thin and uniform. Consequently, it is possible to decrease the leakage current of thesilicide layers 35 a. Also, the entire semiconductor device has a constant leakage current, thereby enhancing the quality of the semiconductor device. - An example method for fabricating a semiconductor device performed in accordance with the teachings of the present invention will now be described.
FIG. 3 a toFIG. 3F are cross sectional views illustrating the example fabrication process. - As shown in
FIG. 3A , an oxidation-resistant insulating layer 101 is formed on an entire surface of asemiconductor substrate 21. Thesemiconductor substrate 21 includes an active region AR and field regions FR. Next, the oxidation-resistant insulating layer 101 of the field region FR is selectively removed by photolithography. The oxidation-resistant insulating layer 101 may be formed of a nitride layer, or a deposition layer including an oxide layer and a nitride layer. - Trenches are formed in the field regions FR by selectively etching the field regions FR of the
semiconductor substrate 21. After that, thedevice isolation layer 22 is formed in the trench by sequentially performing an insulating layer gap filling process and a CMP process. These processes are collectively referred to as an STI (shallow trench isolation) process. Instead of the STI process, thedevice isolation layer 22 may be formed in an LOCOS (local oxidation of silicon) process. Then, the oxidation-resistantinsulating layer 101 is removed. - Referring to
FIG. 3B , agate insulating layer 31 and a conductive layer are sequentially deposited on thesemiconductor substrate 22. Portions of thegate insulating layer 31 and the conductive layer are then selectively removed by photolithography to thereby form thegate insulating layer 31 and thegate electrode 32 in the active region AR. - Subsequently, an oxide layer or a nitride layer is deposited on the entire surface of the
semiconductor substrate 21 including on thegate electrode 32. Then, the oxide layer or the nitride layer is etched by a dry-etch process having anisotropic etching characteristics or by a reactive ion etching process to thereby form sidewall insulatinglayers 33 on the sidewalls of thegate electrode 32. - As shown in
FIG. 3C , highly doped impurity ions are implanted into thesemiconductor substrate 21 of the active region AR while using thesidewall insulating layers 33 and thegate electrode 32 as a mask. As a result, the source/drain regions 34 are formed on opposite sides of thegate electrode 32 in the active region AR of thesemiconductor substrate 21. - Although not shown, before forming the
sidewall insulating layers 33 and after forming thegate insulating layer 31 and thegate electrode 32, lightly doped impurity ions may be implanted into the active region AR of thesemiconductor substrate 21 on opposite sides of thegate electrode 32 while using thegate electrode 32 as a mask to thereby form the sidewall insulating layers 33. Then, highly doped impurity ions may be implanted into the active region AR of thesemiconductor substrate 21 while using thegate electrode 32 and thesidewall insulating layers 33 as a mask to thereby form the source/drain regions 34. - As shown in
FIG. 3D , aphotoresist layer 102 is deposited on the entire surface of thesemiconductor substrate 21. The photoresist layer is patterned to expose the source/drain regions 34 adjacent to the device isolation layers 22 by an exposure and development process using a mask. Then, by implanting ions into the source/drain regions 34 adjacent to the device isolation layers 22 exposed by thephotoresist pattern 102, theamorphous layer 41 is formed in the source/drain regions 34 adjacent to the device isolation layers 22. In the illustrated example, theamorphous layers 41 have a predetermined thickness between about 1 μm and about 5 μm. In the illustrated example, Ge+ ions are used. - As shown in
FIG. 3E , after removing thephotoresist pattern 102, arefractory metal 36 of tungsten or titanium is deposited on the entire surface of thesemiconductor substrate 21 by sputtering. A thermal process is then performed on the resulting structure. - Then, a
silicide layer 35 of SiXWY or SiTiX is formed on the surface of the source/drain regions 34 in the interface between thesilicon semiconductor substrate 21 and therefractory metal 36. If thegate electrode 32 is formed of silicon, the silicide layer is also formed on the surface of thegate electrode 32. - When the thermal process is performed on the refractory metal formed on the entire surface of the semiconductor substrate to form the
silicide layer 35 on the surface of the source/drain regions 34, the silicide layers 35 a are also formed in the interfaces between the device isolation layers 22 and the source/drain regions 34. - However, the source/
drain regions 34 adjacent to the device isolation layers 22 are formed asamorphous layers 41. Consequently, the silicide layers 35 a are thinly formed in the interfaces between the device isolation layers 22 and the source/drain regions 34 due to theamorphous layer 41. Since the leakage current of the silicide layers 35 a is in proportion to the thickness of the silicide layers 35 a, it is possible to decrease the leakage current of the silicide layers 35 a by decreasing the thickness of the silicide layers 35 a. - After removing the
refractory metal 36, the conventional processes of forming an insulating interlayer (not shown), forming a contact hole (not shown), and forming the metal line (not shown) are sequentially performed, to thereby complete the semiconductor device. - From the foregoing, persons of ordinary skill in the art will appreciate that the illustrated semiconductor device includes amorphous layers formed in the source/
drain regions 14 adjacent the device isolation layers 22. The presence of theseamorphous layers 41 stably thins the silicide layers 35 a. As a result, it is possible to decrease the leakage current of the silicide layers 35 a formed in the interfaces between the device isolation layers 22 and the source/drain regions 14, thereby enhancing the quality of the completed semiconductor device. - From the foregoing, persons of ordinary skill in the art will readily appreciate that semiconductor devices and methods for fabricating the same have been disclosed which decrease a leakage current of a silicide layer formed in an interface between a device isolation layer and a source or drain region. In the illustrated example, this decrease in leakage current is accomplished by forming an amorphous layer in the interface between the device isolation layer and the source or drain region to stably thin the silicide layer formed in the interface between the device isolation layer and the source/drain region.
- An illustrated example semiconductor device includes a semiconductor substrate having an active region and a field region; a device isolation layer in the field region; a gate electrode on the active region; source/drain regions in the active region on opposite sides of the gate electrode; and an amorphous layer in the source or drain region adjacent the device isolation layer.
- In the illustrated example, the amorphous layer is formed at a thickness between about 1 μm and 5 μm.
- In addition, the illustrated semiconductor device includes a silicide layer on the surface of the source/drain regions.
- An illustrated example method for fabricating a semiconductor device includes forming a device isolation layer in a field region of a semiconductor substrate to define an active region; forming a gate electrode on the active region; forming source/drain regions in the active region on opposite sides of the gate electrode; implanting ions to form an amorphous layer in the source or drain region adjacent to the device isolation layer; and forming a silicide layer on the surface of the source/drain regions.
- In the illustrated example, the implanted ions are Ge+ ions.
- Also, in the illustrated example, forming the silicide layer on the surface of the source/drain regions comprises depositing a refractory metal on an entire surface of the semiconductor substrate, and performing a thermal process to form a silicide layer in an interface between the refractory metal and the source or drain region.
- It is noted that this patent claims priority from Korean Patent Application Serial Number P2003-100706, which was filed on Dec. 30, 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 (17)
1. A semiconductor device comprising:
a semiconductor substrate including an active region and a field region;
a device isolation layer in the field region;
a gate electrode on the active region;
source/drain regions on opposite sides of the gate electrode; and
an amorphous layer in at least one of the source region and the drain region, adjacent to the device isolation layer.
2. The semiconductor device of claim 1 , wherein the amorphous layer has a thickness between about 1 μm and about 5 μm.
3. The semiconductor device of claim 1 , further comprising a silicide layer on the surface of the source/drain regions, including on the amorphous layer.
4. The semiconductor device of claim 1 , further comprising sidewall insulating layers on opposite sidewalls of the gate electrode.
5. The semiconductor device of claim 1 , wherein the amorphous layer is at interfaces between the device isolation layer and the source/drain regions.
6. The semiconductor device of claim 1 , wherein the silicide layer comprises SiXWY or SiTiX.
7. The semiconductor device of claim 1 , wherein the gate electrode comprises silicon.
8. The semiconductor device of claim 7 , wherein the silicide layer is on the surface of the gate electrode.
9. The semiconductor device of claim 1 , wherein the amorphous layer comprises Ge+ ions.
10. The semiconductor device of claim 3 , wherein the silicide layer comprises a refractory metal silicide.
11. The semiconductor device of claim 1 , further comprising an insulating layer on the gate and the source/drain regions.
12. The semiconductor device of claim 11 , further comprising a contact hole in the insulating layer.
13. The semiconductor device of claim 12 , further comprising a metal line on the insulating layer.
14. The semiconductor device of claim 1 , wherein the device isolation layer comprises a planarized LOCOS or STI layer.
15. The semiconductor device of claim 4 , wherein the sidewall insulating layers comprise an oxide or a nitride.
16. The semiconductor device of claim 1 , further comprising a gate insulating layer over the substrate and below the gate electrode.
17. The semiconductor device of claim 1 , further comprising a uniform silicide layer at interfaces between the device isolation layer and the amorphous layers.
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US12/102,819 US20080258145A1 (en) | 2003-12-30 | 2008-04-14 | Semiconductor Devices Including an Amorphous Region in an Interface Between a Device Isolation Layer and a Source/Drain Diffusion Layer |
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KR1020030100706A KR100588779B1 (en) | 2003-12-30 | 2003-12-30 | Semiconductor device and method for fabricating the same |
KR2003-0100706 | 2003-12-30 | ||
US11/027,362 US7399669B2 (en) | 2003-12-30 | 2004-12-29 | Semiconductor devices and methods for fabricating the same including forming an amorphous region in an interface between a device isolation layer and a source/drain diffusion layer |
US12/102,819 US20080258145A1 (en) | 2003-12-30 | 2008-04-14 | Semiconductor Devices Including an Amorphous Region in an Interface Between a Device Isolation Layer and a Source/Drain Diffusion Layer |
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US11/027,362 Division US7399669B2 (en) | 2003-12-30 | 2004-12-29 | Semiconductor devices and methods for fabricating the same including forming an amorphous region in an interface between a device isolation layer and a source/drain diffusion layer |
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US12/102,819 Abandoned US20080258145A1 (en) | 2003-12-30 | 2008-04-14 | Semiconductor Devices Including an Amorphous Region in an Interface Between a Device Isolation Layer and a Source/Drain Diffusion Layer |
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US6486513B1 (en) * | 1999-07-23 | 2002-11-26 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor device |
US6548331B2 (en) * | 2000-12-01 | 2003-04-15 | Pt Plus Co. Ltd. | Method for fabricating thin film transistor including crystalline silicon active layer |
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JPH118389A (en) * | 1997-06-19 | 1999-01-12 | Hitachi Ltd | Semiconductor device |
KR100513803B1 (en) * | 1998-10-13 | 2005-12-05 | 주식회사 하이닉스반도체 | Contact formation method of semiconductor device |
JP2001338988A (en) * | 2000-05-25 | 2001-12-07 | Hitachi Ltd | Semiconductor device and its manufacturing method |
KR100414735B1 (en) * | 2001-12-10 | 2004-01-13 | 주식회사 하이닉스반도체 | A semiconductor device and A method for forming the same |
-
2003
- 2003-12-30 KR KR1020030100706A patent/KR100588779B1/en not_active IP Right Cessation
-
2004
- 2004-12-29 US US11/027,362 patent/US7399669B2/en active Active
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2008
- 2008-04-14 US US12/102,819 patent/US20080258145A1/en not_active Abandoned
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US5869377A (en) * | 1984-08-22 | 1999-02-09 | Mitsubishi Denki Kabushiki Kaisha | Method of fabrication LDD semiconductor device with amorphous regions |
US4764248A (en) * | 1987-04-13 | 1988-08-16 | Cypress Semiconductor Corporation | Rapid thermal nitridized oxide locos process |
US6008111A (en) * | 1996-03-15 | 1999-12-28 | Fujitsu Limited | Method of manufacturing semiconductor device |
US5899732A (en) * | 1997-04-11 | 1999-05-04 | Advanced Micro Devices, Inc. | Method of implanting silicon through a polysilicon gate for punchthrough control of a semiconductor device |
US6030863A (en) * | 1998-09-11 | 2000-02-29 | Taiwan Semiconductor Manufacturing Company | Germanium and arsenic double implanted pre-amorphization process for salicide technology |
US6486513B1 (en) * | 1999-07-23 | 2002-11-26 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor device |
US6548331B2 (en) * | 2000-12-01 | 2003-04-15 | Pt Plus Co. Ltd. | Method for fabricating thin film transistor including crystalline silicon active layer |
US6872642B2 (en) * | 2002-11-22 | 2005-03-29 | Renesas Technology Corp. | Manufacturing method of semiconductor device |
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KR100588779B1 (en) | 2006-06-12 |
KR20050068890A (en) | 2005-07-05 |
US20050153529A1 (en) | 2005-07-14 |
US7399669B2 (en) | 2008-07-15 |
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