WO2011124088A1 - 一种栅堆叠结构、半导体器件及二者的制造方法 - Google Patents
一种栅堆叠结构、半导体器件及二者的制造方法 Download PDFInfo
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- WO2011124088A1 WO2011124088A1 PCT/CN2011/000581 CN2011000581W WO2011124088A1 WO 2011124088 A1 WO2011124088 A1 WO 2011124088A1 CN 2011000581 W CN2011000581 W CN 2011000581W WO 2011124088 A1 WO2011124088 A1 WO 2011124088A1
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- gate
- dielectric layer
- stack structure
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- isolation
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Classifications
-
- 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 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
- H01L21/28008—Making conductor-insulator-semiconductor electrodes
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28247—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon passivation or protection of the electrode, e.g. using re-oxidation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66545—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
Definitions
- Gate stack structure semiconductor device and manufacturing method thereof
- the present invention relates to the field of semiconductor technology, and in particular to a gate stack structure, a semiconductor device, and a method of fabricating the same.
- CA contact holes
- the gate stack structure includes a gate dielectric layer 20 formed on the substrate 10, a gate electrode 40 formed on the gate dielectric layer 20, and surrounding the gate dielectric layer 20 and the gate. Side wall 30 of pole 40.
- the gate 40 is mostly made of a metal gate.
- the gate 40 is located on the active region 12 and the connection region 14 of the substrate 10, and the gate 40 on the active region 12 is used to adjust device performance.
- the gate electrode 40 on the connection region 14, the contact hole 16 formed thereon, and the contact hole 18 formed on the active region 12 are each used to form a metal interconnection.
- a first contact hole 60 that is equal in height to the gate stack structure is formed, and then a second contact hole 62 is formed on the first contact hole 60.
- the second contact hole 62 and the first contact hole 60 together form a contact hole in the same interlayer dielectric layer 50 to form a first layer of metal interconnection.
- the formation process of the contact hole is divided into two parts (referred to as two contact hole forming processes in this document), which is advantageous for reducing the aspect ratio of the contact hole during the etching process, and reducing defects such as incomplete etching and filling of holes.
- the present invention provides a gate stack structure and a manufacturing method reduces the possibility of a short circuit between the gate electrode and the second contact hole;:
- the present invention provides a semiconductor device and a manufacturing method, The possibility of a short circuit between the second contact hole and the gate in the semiconductor device can be reduced.
- a gate stack structure provided by the present invention includes
- a gate dielectric layer formed on the active region and the connection region in the substrate
- An isolation dielectric layer is formed on the gate and embedded therein, the sidewall spacer covers opposite sides of the isolation dielectric layer, and a thickness of the isolation dielectric layer on the active region is greater than that in the connection region The thickness of the isolation dielectric layer above.
- the isolation dielectric layer is located only on the active region.
- the barrier dielectric layer material is different from the barrier layer material when a barrier layer is introduced into the device comprising the gate stack structure.
- the isolation dielectric layer is one or a combination of silicon nitride, silicon carbonitride, doped or undoped vitreous silica or a low dielectric constant dielectric material.
- a method for fabricating a gate stack structure provided by the present invention includes
- a gate dielectric layer Forming a gate dielectric layer, a gate formed on the gate dielectric layer, and a sidewall surrounding the gate dielectric layer and the gate on a substrate including an active region and a connection region;
- Removing a portion of the thickness of the gate, the removed thickness on the active region is greater than a thickness on the connection region to expose opposing inner walls of the sidewall;
- An isolation dielectric layer is formed on the gate, the isolation dielectric layer covering the exposed inner wall.
- the step of removing a portion of the thickness of the gate is: removing only a portion of the thickness of the gate on the active region.
- the barrier dielectric layer material is different from the barrier layer material when the barrier layer is introduced after forming the gate stack structure.
- the isolation dielectric layer is one or a combination of silicon nitride, silicon carbonitride, doped or undoped vitreous silica or a low dielectric constant dielectric material.
- the present invention provides a semiconductor device comprising the above-described gate stack structure.
- a method of fabricating a semiconductor device provided by the present invention includes
- the gate stack structure is formed by the above method.
- the technical solution provided by the present invention has the following advantages: by embedding an isolation dielectric layer on the gate, and covering the opposite side of the isolation dielectric layer on the gate, located in the active region
- the thickness of the isolation dielectric layer above is greater than the thickness of the isolation dielectric layer on the connection region, and the vertical distance between the gate and the second contact hole in the active region may be increased, and the gate is Forming an isolation strip between the second contact holes to reduce the possibility of a short circuit between the gate and the second contact hole; for the gate located on the connection region, Adjusting the thickness of the isolation dielectric layer such that the thickness of the isolation dielectric layer formed thereon is as small as possible to be compatible with the two contact hole formation processes when etching the second contact hole;
- the isolation dielectric layer only on the active region, the presence of the short-circuit between the gate and the second contact hole can be reduced.
- the isolation dielectric layer is no longer formed on the gate, and is better compatible with the two contact hole formation processes when etching the second contact hole;
- isolation dielectric layer material different from the barrier layer material, when the barrier layer is etched to form a second contact hole, damage to the isolation dielectric layer is minimized, which is beneficial to ensure the gate and the gate.
- the isolation effect between the second contact holes is described.
- FIG. 1 is a schematic structural view of a gate stack structure in the prior art
- Figure 2 is a plan view showing the structure of the device in the prior art
- FIG. 3 is a schematic structural view of a first layer of metal interconnects in the prior art
- FIG. 4 is a schematic structural view of a first embodiment of the gate stack structure of the present invention in an active region
- FIG. 6 is a schematic structural view of a second embodiment of the gate stack structure of the present invention in the active region
- FIG. 7 is a second embodiment of the gate stack structure of the present invention in the connection region.
- FIG. 8 to FIG. 16 are schematic diagrams showing intermediate structures of the first embodiment of the manufacturing method of the gate stack structure of the present invention
- 17 to FIG. 18 are plan views showing the structure obtained after the first embodiment of the method for fabricating the gate stack structure of the present invention;
- Fig. 19 through Fig. 21 are views showing the intermediate structure of the second embodiment of the second embodiment of the method for fabricating the gate stack structure of the present invention.
- the present invention may repeat reference numerals and/or letters in different embodiments. This repetition is for the purpose of simplification and clarity, and does not in itself indicate the relationship between the various embodiments and/or arrangements discussed.
- the gate stack structure includes: a gate dielectric layer 120 formed on the substrate 100, and a gate electrode formed on the gate dielectric layer 120. And a sidewall 160 surrounding the gate dielectric layer 120 and the gate; the gate includes a work function metal layer 140, a metal layer 142, and an auxiliary metal layer 144, and the work function metal layer 140 is formed in the
- the gate dielectric layer 120 extends toward the inner wall of the sidewall 160, the metal layer 142 is formed on the work function metal layer 140, and the auxiliary metal layer 144 is formed on the metal layer 142.
- the resistivity of the metal layer 144 is less than the resistivity of the metal layer 142, and an isolation dielectric layer 164 is formed only on the auxiliary metal layer 144 located in the active region of the substrate, the sidewall 160 covering the isolation. The opposite sides of the dielectric layer 164.
- the substrate 100 means a substrate that has undergone a processing operation, the processing operation includes pre-cleaning, forming a well region, and forming a shallow trench isolation region, and an area surrounded by the shallow trench isolation region is an active region.
- the metal interconnection is extremely completed, and therefore, in this document, the area where the gate of the metal interconnection is completed is referred to as a connection area.
- the substrate may comprise a silicon wafer or other compound semiconductor such as silicon carbide, gallium arsenide, indium arsenide or indium phosphide;
- the substrate preferably includes an epitaxial layer; the substrate may also include a silicon-on-insulator (SOI) structure.
- SOI silicon-on-insulator
- the gate dielectric layer 120 may be selected from a germanium-based material such as one or a combination of Hf ⁇ 2 , HfSiO, HfSiON, HfTaO, HfTiO or HfZrO.
- the sidewall 160 may include one or a combination of silicon nitride, silicon oxide, silicon oxynitride, silicon carbide.
- the side wall 160 may have a multi-layered structure. The above processing operations and the formation of the gate dielectric layer 120 and the spacers 160 may be performed using a conventional process.
- the gate may be formed by a dummy gate process, that is, a dummy gate is formed by using, for example, polysilicon, and then a sidewall surrounding the dummy gate is formed, and the dummy gate is removed on the side.
- a gate region is formed in a region surrounded by the inner wall of the wall, and a gate electrode is formed after filling the work function metal layer, the metal layer and the auxiliary metal layer in the gate region.
- the work function metal layer 140 may include one or a combination of TiN, TiAlN, TaN, or TaAIN; the metal layer 142 and the auxiliary metal layer 144 may include one of Al, Ti, Ta, W, or Cukind or a combination thereof.
- a lightly doped drain region (LDD), a source drain region, and a contact region have been formed on the substrate as required by the process (the contact region 102 is mostly a metal silicide for use in a silicon liner)
- the silicon and the subsequently deposited conductive material are better contacted; the metal material formed on the substrate to form the metal silicide includes one of Co, Ni, Mo, Pt or W or Its combination).
- the work function metal layer 140, the metal layer 142, and the auxiliary metal layer 144 may be sputtered, pulsed laser deposition (PLD), metal organic chemical vapor deposition (MOCVD), atomic layer deposition (ALD), plasma enhanced atoms. Layer deposition (PEALD) or other suitable process is formed.
- PLD pulsed laser deposition
- MOCVD metal organic chemical vapor deposition
- ALD atomic layer deposition
- PEALD plasma enhanced atoms.
- PEALD Layer deposition
- the auxiliary metal layer 144 may be removed by a dry etching technique such as reactive ion etching (RIE) or a wet etching technique to form an isolation dielectric layer 164 on the gate, and the Sidewalls 160 cover opposite sides of the isolation dielectric layer 164.
- RIE reactive ion etching
- the partial thickness of the auxiliary metal layer 144 to be removed may be flexibly determined according to device performance and process requirements, as long as the auxiliary metal layer 144 is used to remove a portion of the thickness to provide an accommodation space in which the isolation medium is formed.
- an additional isolation strip may be formed between the gate and the second contact hole.
- the auxiliary metal layer 144 is selected to reduce the gate resistance.
- the thickness of the auxiliary metal layer 144 and the sidewall 160 are The ratio of heights may be greater than or equal to 20%, and the ratio of the thickness of the isolation dielectric layer 164 to the height of the sidewall spacers 160 may be greater than or equal to 15%;
- the gate may include only the work function metal layer 140 and the metal layer 142. In this case, dry etching or wet etching may be used, such as reactive ion etching (RIE).
- RIE reactive ion etching
- the ratio of the thickness of the isolation dielectric layer 164 to the height of the sidewall 160 may be Greater than or equal to 15%
- the side wall 160 covers the opposite side of the isolation dielectric layer 164.
- the partial thickness of the work function metal layer 140 and the metal layer 142 removed may be flexibly determined according to device performance and process requirements, as long as the work function metal layer 140 and the metal layer 142 are used to remove a portion of the thickness to provide a receiving space.
- an additional isolation strip may be formed between the gate and the second contact hole.
- the isolation dielectric layer 164 may be silicon nitride, silicon carbonitride, doped or undoped silicon oxide glass (such as fluorosilicate glass, borosilicate glass, phosphosilicate glass, borophosphosilicate glass, carbon oxide).
- silicon oxide glass such as fluorosilicate glass, borosilicate glass, phosphosilicate glass, borophosphosilicate glass, carbon oxide.
- One or a combination of silicon or silicon oxynitride or a low dielectric constant dielectric material such as black diamond, coral, or the like.
- the isolation dielectric layer 164 can be formed using chemical vapor deposition (CVD), PLD, ALD, PEALD, or other suitable process.
- the barrier layer will cover the isolation dielectric layer, and the material of the barrier layer may be silicon nitride or silicon carbonitride.
- the material of the isolation dielectric layer 164 may be the same as the material of the barrier layer.
- the barrier layer is etched to form a second contact.
- a thickness such that a portion of the thickness remains after the etching operation of the barrier layer to form an isolation band between the gate and the contact hole, and the gate and the second contact hole are reduced. The possibility of a short circuit between them.
- the material of the isolation dielectric layer 164 is different from the material of the barrier layer, that is, if the barrier layer material is selected as silicon nitride, the isolation dielectric layer
- the 164 material can be selected from undoped silica.
- the barrier layer is formed by the same etchant (such as an etching gas or an etching solvent) for the engraved material of a different material. 'The compartment medium The layer is etched to a lesser extent and the isolation is better. That is, by making the isolation dielectric layer material different from the barrier layer material, when the barrier layer is etched to form a second contact hole, damage to the isolation dielectric layer is minimized, which is beneficial to ensure the gate. The effect of isolation from the second contact hole.
- the isolation dielectric layer is only located on the active region, as shown in FIG. 5, at this time, the gate stack structure on the connection region only includes: a gate on 104 (the material in contact with the gate in the connection region 104 is typically a shallow trench isolation material, such as undoped silicon dioxide, etc.), and a spacer surrounding the gate
- the gate includes a work function metal layer 140, a metal layer 142, and an auxiliary metal layer 144.
- the work function metal layer 140 is formed on the gate dielectric layer 120 and extends toward an inner wall of the sidewall 160.
- the metal layer 142 is formed on the work function metal layer 140.
- the auxiliary metal layer 144 is formed on the metal layer 142.
- the auxiliary metal layer 144 has a resistivity lower than that of the metal layer 142.
- the isolation dielectric layer is not included in the gate stack structure on the connection region 104.
- an isolation dielectric layer may also be included in the gate stack structure on the connection region 104, except for the thickness of the isolation barrier layer on the active region. It is required to be larger than the thickness of the isolation dielectric layer on the connection region. At this time, although the isolation dielectric layer is introduced in the gate stack structure on the connection region 104, the second contact hole connected to the gate and the second connection connected to the first contact hole are caused to be etched.
- the thickness of the dielectric layer to be removed is different; when etching the second contact hole connected to the first contact hole, only the interlayer dielectric layer and the barrier layer formed on the first contact hole are removed, And etching the second contact hole connected to the gate, removing the interlayer dielectric layer and the barrier layer formed on the gate, and removing the upper surface formed on the gate Isolate the dielectric layer. Even so, the gate stack structure incorporating the new structure can be made compatible with the two contact hole formation processes by adjusting the formation process of the isolation dielectric layer.
- the isolation dielectric layer formed on the gate electrode in the connection region is as far as possible Thin, the isolation dielectric layer can be over-etched Removed during operation (even if the isolation dielectric layer is different from the barrier material, the etchant selected has different etching effects, but the etchant used to remove the barrier material will always Etching the isolation dielectric layer material to some extent, as long as the isolation dielectric layer is as thin as possible, the operation is achievable; further, forming the isolation medium of different thicknesses on the active region and the connection region The thickness of the gates that are removed in advance is different.
- the gates of different thicknesses may be removed by a single mask multi-etch depth process;
- the single mask multiple etch depth process means A pattern having different gradations is formed in a mask, and a material having a single thickness can be etched using each gradation pattern to make the gate stack structure incorporating the new structure compatible with the two contact hole forming processes.
- the gate stack structure includes: a gate dielectric layer 120 formed on the substrate 100, and a gate formed on the gate dielectric layer 120. And a sidewall 160 surrounding the gate dielectric layer 120 and the gate; the gate includes polysilicon 146 (preferably doped polysilicon), and an isolation dielectric layer 164 is further formed on the gate.
- the side walls 160 cover opposite sides of the isolation dielectric layer 164.
- the processing operations required to form the substrate and the formation of the gate dielectric layer 120, the gate and the sidewall spacers 160 may be performed using conventional processes.
- a contact region 102 is also formed on the substrate 100.
- the polysilicon 146 may be partially removed by a dry etching technique such as reactive ion etching (RIE) or a wet etching technique.
- RIE reactive ion etching
- the thickness of the portion of the polysilicon 146 to be removed may be flexibly determined according to device performance and process requirements, as long as the polysilicon layer 146 is used to remove a portion of the thickness to provide a receiving space, and the isolation dielectric layer 164 is formed in the receiving space. To form an additional isolation strip between the gate and the contact hole.
- the isolation dielectric layer is only located on the active region, as shown in FIG. 7.
- the gate stack structure on the connection region only includes: a gate on the connection region 104, and a spacer 160 surrounding the gate; the gate includes polysilicon 146 (preferably doped polysilicon).
- the isolation dielectric layer may be silicon nitride, silicon carbonitride, doped or undoped silicon oxide glass (such as fluorosilicate glass, borosilicate glass, phosphosilicate glass, borophosphosilicate glass, silicon oxycarbide). Or a combination of a low dielectric constant dielectric material (such as black diamond, coral, etc.) or a combination thereof; the ratio of the thickness of the isolation dielectric layer to the height of the sidewall spacer may be greater than or equal to 15%; the dielectric layer material may be the same as the barrier material Or different.
- the isolation dielectric layer may be located only on the active region; or may be located on the active region and the connection region at the same time, except that the thickness of the isolation dielectric layer on the active region is greater than that on the connection region.
- the ratio of the thickness of the isolation dielectric layer to the height of the sidewall spacer may be greater than or equal to 15%.
- the thickness of the isolation dielectric layer on the active region is greater than the isolation on the connection region by embedding an isolation dielectric layer on the gate and covering the sidewalls with opposite sides of the isolation dielectric layer
- the thickness of the dielectric layer (in other words, the thickness of the gate on the active region is smaller than the thickness of the gate on the connection region), which can increase the vertical between the gate and the second contact hole in the active region a distance, and forming an isolation strip between the gate and the second contact hole, reducing a possibility of a short circuit between the gate and the second contact hole; for being located on the connection area
- the thickness of the isolation dielectric layer may be adjusted such that the thickness of the isolation dielectric layer formed thereon is as small as possible, so that when the second contact hole is etched, Secondary contact hole formation process compatibility ⁇
- the gate can also select other materials than metal or polysilicon. Under the teaching of the above embodiments, those skilled in the art can flexibly apply the material by using the substitute material. The technical solutions provided by the present invention are not described again.
- the present invention also provides a method of fabricating a gate stack structure.
- the manufacturing method includes: First, as shown in FIG. 8, the gate dielectric layer 220, the dummy gate 240, and the lightly doped are sequentially formed on the substrate 200. a drain region (not shown), a sidewall 260 surrounding the dummy gate 240 and the gate dielectric layer 220, a cap layer 262 covering the dummy gate 240, and a source and drain region (not shown) and a contact region 202 .
- the substrate 200 means a substrate that has undergone a processing operation, the processing operations including pre-cleaning, forming a well region, and completing shallow trench isolation.
- the substrate may comprise a silicon wafer or other compound semiconductor such as silicon carbide, gallium arsenide, indium arsenide or indium phosphide; further, the substrate optionally comprises an epitaxial layer; the substrate may also comprise an insulator Silicon on silicon (SOI) structure.
- SOI Silicon on silicon
- the gate dielectric layer 220 may be selected from a germanium-based material such as one or a combination of Hf0 2 , HfSiO, HfSiON HfTaO, HfTiO or HfZrO.
- Side wall 260 and covering the dummy The capping layer 262 of the gate may each comprise one or a combination of silicon nitride, silicon oxide, silicon oxynitride, silicon carbide.
- the side wall 260 may have a multi-layered structure.
- the dummy gate 240 may be selected from polysilicon or amorphous silicon.
- the above processing operations and the formation of the gate dielectric layer 220, the sidewall 260, the dummy gate 240, and the cap layer 262 covering the dummy gate 240, and the lightly doped drain region, the source and drain regions, and the contact region 202 may be performed using a conventional process.
- the contact region 202 is mostly a metal silicide to better contact silicon and a subsequently deposited conductive material when a silicon substrate is selected; a metal formed on the substrate to form the metal silicide
- the material includes one or a combination of Co, Ni, Mo, Pt or W.
- an interlayer dielectric layer 280 is formed on the substrate 200 subjected to the above operation, and then the interlayer dielectric layer 280 is planarized and the cap layer 262 covering the dummy gate 240 is removed to The dummy gate 240 is exposed.
- the interlayer dielectric layer 280 may be formed by using a V VD and/or other suitable process, and the interlayer dielectric layer 280 includes silicon oxide, fluorosilicate glass, borosilicate glass, phosphosilicate glass, borophosphosilicate glass. One or a combination of low-k dielectric materials (eg, black diamonds, coral, etc.).
- the interlayer dielectric layer 280 may have a multilayer structure. The operation of planarizing the interlayer dielectric layer 280 and removing the cap layer 262 covering the dummy gate 240 may be performed using, for example, a chemical mechanical polishing (CMP) process.
- CMP chemical mechanical polishing
- the dummy gate 240 is removed to obtain a gate space surrounded by the inner wall of the sidewall spacer 260, and the success function metal layer 242 and the metal layer 244 are sequentially formed to fill the gate space.
- the dummy gate 240 may be removed by a dry etching technique such as reactive ion etching (RIE) or a wet etching technique. After the dummy gate 240 is removed, the gate dielectric layer 220 may be selectively removed or the gate dielectric layer 220 may be removed to re-form the gate dielectric layer 220 to optimize device performance.
- RIE reactive ion etching
- the work function metal layer 242 may comprise one or a combination of TiN, TiAlN, TaN or TaAIN; the metal layer 244 may comprise one or a combination of Al, Ti, Ta, W or Cu.
- the work function metal layer 242 and the metal layer 244 may be formed by sputtering, PLD, MOCVD, ALD, PEALD, or other suitable processes.
- the work function metal layer 242 and the metal layer 244 outside the gate space may be removed using a chemical mechanical polishing (CMP) process. Then, as shown in FIG. 12, the work function metal layer 242 and the metal layer 244 are partially removed in the gate space.
- CMP chemical mechanical polishing
- the work function metal layer 242 and the metal layer 244 may be removed by a dry etching technique such as reactive ion etching (RIE) or a wet etching technique to remove a portion of the thickness in the gate space.
- RIE reactive ion etching
- an auxiliary metal layer 246 is formed on the metal layer 244, and the auxiliary metal layer 246 has a resistivity lower than that of the metal layer 244.
- the auxiliary metal layer 246 can be formed by sputtering, PLD, MOCVD, ALD, PEALD, or other suitable process.
- the auxiliary metal layer 246 may include one or a combination of Al, Ti, Ta, W, or Cu.
- the auxiliary metal layer 246 outside the gate space may be removed using a chemical mechanical polishing (CMP) process.
- CMP chemical mechanical polishing
- the auxiliary metal layer 246 of the partial thickness of the active region within the gate space is removed to expose the opposite inner walls of the sidewall spacers.
- the auxiliary metal layer 246 may be removed by a dry etching technique such as reactive ion etching (RIE) or a wet etching technique to remove a portion of the thickness in the gate space.
- RIE reactive ion etching
- the thickness of the portion of the auxiliary metal layer 246 to be removed may be flexibly determined according to device performance and process requirements, as long as the auxiliary metal layer 246 is used to remove a portion of the thickness to provide an accommodation space in which the isolation medium is formed.
- an additional isolation strip may be formed between the gate and the second contact hole.
- an isolation dielectric layer 264 is formed over the auxiliary metal layer 246, the isolation dielectric layer 264 covering the exposed inner walls. After the isolation dielectric layer 264 outside the gate space is removed, operations such as forming an interlayer dielectric layer and a second contact hole may be continued. At this time, as shown in Fig. 17, the isolation dielectric layer 264 is formed only on the active region 106.
- the isolation dielectric layer 264 may be silicon nitride, silicon carbonitride, doped or undoped silicon oxide glass (such as fluorosilicate glass, borosilicate glass, phosphosilicate glass, borophosphosilicate glass, carbon oxide).
- silicon oxide glass such as fluorosilicate glass, borosilicate glass, phosphosilicate glass, borophosphosilicate glass, carbon oxide.
- One or a combination of silicon or silicon oxycarbonitride or a low dielectric constant dielectric material such as black diamond, coral, or the like.
- the isolation dielectric layer 264 may be formed by a process such as CVD, PLD, ALD or PEALD.
- the auxiliary metal layer 246 is for reducing the gate current.
- the ratio of the thickness of the auxiliary metal layer 144 to the height of the sidewall 160 may be greater than or equal to 20%, and the thickness of the isolation dielectric layer 164 and the side The height ratio of the wall 160 may be greater than or equal to 15%; in other embodiments of the gate stack structure, the gate may include only the work function metal layer 242 and the metal layer 244, and at this time, reactive ion etching may be employed.
- a dry etching technique or a wet etching technique removes a portion of the work function metal layer 242 and the metal layer 244 to form an isolation dielectric layer 264 on the gate of the active region (at this time,
- the ratio of the thickness of the isolation dielectric layer 264 to the height of the sidewall spacers 160 may be greater than or equal to 15%), and the sidewall spacers 260 may cover opposite sides of the isolation dielectric layer 264.
- the partial thickness of the work function metal layer 242 and the metal layer 244 to be removed may be flexibly determined according to device performance and process requirements, as long as the work function metal layer 242 and the metal layer 244 are used to remove a portion of the thickness to provide a receiving space.
- an additional isolation strip may be formed between the gate and the second contact hole.
- the barrier layer covering the The dielectric layer may be made of silicon nitride or silicon carbonitride.
- the material of the isolation dielectric layer may be the same as the material of the barrier layer.
- the barrier layer is etched to form a second contact hole.
- the second contact hole is very close to the gate, when the barrier layer is etched, a portion of the thickness of the isolation dielectric layer is etched, and the isolation dielectric layer may be controlled in advance. Thickness, such that it retains a partial thickness after undergoing an etching operation of the barrier layer to form an isolation band between the gate and the contact hole, reducing between the gate and the second contact hole The possibility of a short circuit.
- the spacer dielectric layer material is different from the barrier layer material.
- the etching rate of different materials is different for the same etchant (such as etching gas or etching solvent)
- the etching rate of the barrier material may be selected to be fast.
- the barrier layer is etched by an etchant having a slower etch rate of the dielectric layer material.
- the isolation dielectric layer is etched to a lesser extent, and the isolation effect is better. That is, by making the isolation dielectric layer material different from the barrier layer material, when the barrier layer is etched to form a second contact hole, damage to the isolation dielectric layer is minimized, which is beneficial to ensure the gate.
- the connection region may be further removed.
- the isolation dielectric layer 264 is formed on both the active region and the connection region.
- the second contact hole connected to the gate electrode and the second contact connected to the first contact hole are etched.
- the thickness of the dielectric layer to be removed is different; when etching the second contact holes connected to the first contact holes, only the interlayer dielectric layer and the barrier layer formed on the first contact holes are removed, and When etching the second contact hole connected to the gate, removing the interlayer dielectric layer and the barrier layer formed on the gate, and removing the isolation formed on the gate Medium layer.
- the gate stack structure incorporating the new structure can be made compatible with the two contact hole forming processes by adjusting the formation process of the isolation dielectric layer.
- the isolation dielectric layer formed on the gate electrode in the connection region is as far as possible Thin
- the isolation dielectric layer can be removed in the over-etching operation (even if the isolation dielectric layer is different from the barrier material, the etching agent selected has different etching effects on the two, but
- the etchant for removing the barrier material also always etches the spacer dielectric layer material to some extent, as long as the isolation barrier layer is as thin as possible, and the operation is achievable; Forming the isolation dielectric layer with different thicknesses on the active region and the connection region, and the thickness of the gate electrode removed in advance is different. In this case, a single mask multi-etch depth process may be used to remove different thicknesses.
- the gate is such that the gate stack structure incorporating the new structure is compatible with the two contact hole formation processes.
- the gate is not changed in the connection region, because the second contact hole connected to the gate is connected to the first contact hole.
- the second contact holes are formed synchronously, and the gate stack structure for introducing a new structure is more compatible with the two contact hole forming processes.
- the manufacturing method includes:
- the gate dielectric layer 220, the polysilicon gate 248, the lightly doped drain region (not shown), the surrounding polysilicon gate 248, and the gate dielectric layer are sequentially formed on the substrate 200.
- the polysilicon gate 248 can be formed using conventional processes.
- an interlayer dielectric layer 280 is formed on the substrate 200 subjected to the above operation, and then the interlayer dielectric layer 280 is planarized and the cap layer 262 covering the polysilicon gate 248 is removed. To expose the polysilicon gate 248.
- the planarization operation can be performed using, for example, a chemical mechanical polishing (CMP) process.
- CMP chemical mechanical polishing
- the polysilicon 248 may be partially removed by a dry etching technique such as reactive ion etching (RIE) or a wet etching technique.
- RIE reactive ion etching
- the thickness of the portion of the polysilicon 248 removed may be flexibly determined according to device performance and process requirements (the ratio of the thickness of the portion of the polysilicon 248 removed to the height of the sidewall spacer 260 may be greater than or equal to 15%), as long as Removing the portion of the thickness of the polysilicon layer 248 may provide a receiving space that may form an additional spacer between the gate and the contact hole.
- the operation of forming the isolation dielectric layer 264 is the same as in the previous embodiment, and will not be described again.
- the gate region when the polysilicon 248 having a partial thickness within the gate space in the active region is removed, the gate region may be removed from the connection region.
- the polysilicon 248 is partially thickened, but the thickness of the removed active region is greater than the thickness on the joint to expose the opposing inner walls of the sidewall. Because of the above, it will not be repeated.
- the thickness of the isolation dielectric layer on the active region is greater than the thickness on the connection region by embedding an isolation barrier layer on the gate and covering the sidewalls with opposite sides of the isolation dielectric layer
- the thickness of the isolation dielectric layer (in other words, the thickness of the gate on the active region is smaller than the thickness of the gate on the connection region) can increase the gap between the gate and the second contact hole in the active region a vertical distance, and forming an isolation strip between the gate and the second contact hole, reducing a possibility of a short circuit between the gate and the second contact hole; for being located on the connection area
- the thickness of the isolation dielectric layer may be adjusted such that the thickness of the isolation dielectric layer formed thereon is as small as possible to etch the second contact hole.
- the two contact hole forming processes are compatible.
- the present invention also provides a semiconductor device including the foregoing The gate stack structure described in the embodiment.
- the present invention also provides a method of fabricating a semiconductor device, including
- a metal interconnection is formed on the substrate on which the gate stack structure is formed; wherein the gate stack structure is formed by a method as described in the foregoing embodiments. No longer.
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Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US13/321,886 US8969930B2 (en) | 2010-04-07 | 2011-04-06 | Gate stack structure, semiconductor device and method for manufacturing the same |
CN201190000073.0U CN203085558U (zh) | 2010-04-07 | 2011-04-06 | 一种栅堆叠结构和半导体器件 |
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CN 201010142125 CN102214687A (zh) | 2010-04-07 | 2010-04-07 | 一种栅堆叠结构、半导体器件及二者的制造方法 |
CN201010142125.X | 2010-04-07 |
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Cited By (1)
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CN103377892A (zh) * | 2012-04-13 | 2013-10-30 | 中芯国际集成电路制造(上海)有限公司 | 半导体器件制造方法 |
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US8716095B2 (en) * | 2010-06-03 | 2014-05-06 | Institute of Microelectronics, Chinese Academy of Sciences | Manufacturing method of gate stack and semiconductor device |
CN103187367B (zh) * | 2011-12-29 | 2017-06-23 | 联华电子股份有限公司 | 具有金属栅极的半导体元件的制作方法 |
CN103715134B (zh) * | 2012-09-29 | 2016-05-25 | 中芯国际集成电路制造(上海)有限公司 | 半导体器件及其形成方法 |
CN103794506B (zh) * | 2012-10-30 | 2017-02-22 | 中芯国际集成电路制造(上海)有限公司 | 晶体管的形成方法 |
CN103915386B (zh) * | 2013-01-08 | 2017-05-17 | 中芯国际集成电路制造(上海)有限公司 | Cmos晶体管及其形成方法 |
CN104217992B (zh) * | 2013-06-05 | 2017-03-01 | 中芯国际集成电路制造(上海)有限公司 | 半导体器件及其形成方法 |
US20150118836A1 (en) * | 2013-10-28 | 2015-04-30 | United Microelectronics Corp. | Method of fabricating semiconductor device |
US20150214331A1 (en) | 2014-01-30 | 2015-07-30 | Globalfoundries Inc. | Replacement metal gate including dielectric gate material |
CN105206529A (zh) * | 2014-06-18 | 2015-12-30 | 中国科学院微电子研究所 | 一种鳍式场效应晶体管及其制造方法 |
US9679847B2 (en) * | 2015-06-09 | 2017-06-13 | Stmicroelectronics, Inc. | Self-aligned bottom up gate contact and top down source-drain contact structure in the premetallization dielectric or interlevel dielectric layer of an integrated circuit |
CN106910737B (zh) * | 2015-12-23 | 2021-01-15 | 联华电子股份有限公司 | 半导体元件及其形成方法 |
KR20210104260A (ko) | 2020-02-17 | 2021-08-25 | 삼성전자주식회사 | 반도체 장치 및 이의 제조 방법 |
CN112582375B (zh) * | 2020-12-11 | 2023-11-10 | 中国科学院微电子研究所 | 带侧壁互连结构的半导体装置及其制造方法及电子设备 |
CN112582374B (zh) * | 2020-12-11 | 2023-11-07 | 中国科学院微电子研究所 | 带侧壁互连结构的半导体装置及其制造方法及电子设备 |
CN112582376B (zh) * | 2020-12-11 | 2023-11-17 | 中国科学院微电子研究所 | 带侧壁互连结构的半导体装置及其制造方法及电子设备 |
CN118055613A (zh) * | 2022-11-08 | 2024-05-17 | 长鑫存储技术有限公司 | 半导体结构及其形成方法 |
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US8969930B2 (en) | 2015-03-03 |
US20120061738A1 (en) | 2012-03-15 |
CN102214687A (zh) | 2011-10-12 |
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