WO2022041981A1 - 半导体结构及半导体结构的制造方法 - Google Patents
半导体结构及半导体结构的制造方法 Download PDFInfo
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- WO2022041981A1 WO2022041981A1 PCT/CN2021/101618 CN2021101618W WO2022041981A1 WO 2022041981 A1 WO2022041981 A1 WO 2022041981A1 CN 2021101618 W CN2021101618 W CN 2021101618W WO 2022041981 A1 WO2022041981 A1 WO 2022041981A1
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- Prior art keywords
- bit line
- isolation layer
- line contact
- layer
- semiconductor structure
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000002955 isolation Methods 0.000 claims abstract description 138
- 239000000758 substrate Substances 0.000 claims abstract description 49
- 239000010410 layer Substances 0.000 claims description 206
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 62
- 229920005591 polysilicon Polymers 0.000 claims description 60
- 239000007769 metal material Substances 0.000 claims description 35
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 29
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 22
- 239000002344 surface layer Substances 0.000 claims description 22
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 150000004767 nitrides Chemical class 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 230000001808 coupling effect Effects 0.000 abstract description 5
- 150000002500 ions Chemical class 0.000 description 19
- 238000000231 atomic layer deposition Methods 0.000 description 7
- 238000005240 physical vapour deposition Methods 0.000 description 6
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 6
- 229910052721 tungsten Inorganic materials 0.000 description 6
- 239000010937 tungsten Substances 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 4
- UGACIEPFGXRWCH-UHFFFAOYSA-N [Si].[Ti] Chemical compound [Si].[Ti] UGACIEPFGXRWCH-UHFFFAOYSA-N 0.000 description 4
- GPBUGPUPKAGMDK-UHFFFAOYSA-N azanylidynemolybdenum Chemical compound [Mo]#N GPBUGPUPKAGMDK-UHFFFAOYSA-N 0.000 description 4
- IVHJCRXBQPGLOV-UHFFFAOYSA-N azanylidynetungsten Chemical compound [W]#N IVHJCRXBQPGLOV-UHFFFAOYSA-N 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- HWEYZGSCHQNNEH-UHFFFAOYSA-N silicon tantalum Chemical compound [Si].[Ta] HWEYZGSCHQNNEH-UHFFFAOYSA-N 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- RJCRUVXAWQRZKQ-UHFFFAOYSA-N oxosilicon;silicon Chemical compound [Si].[Si]=O RJCRUVXAWQRZKQ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/30—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
- H10B12/34—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells the transistor being at least partially in a trench in the substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/528—Geometry or layout of the interconnection structure
-
- 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
- H01L21/70—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
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/01—Manufacture or treatment
- H10B12/02—Manufacture or treatment for one transistor one-capacitor [1T-1C] memory cells
- H10B12/05—Making the transistor
- H10B12/053—Making the transistor the transistor being at least partially in a trench in the substrate
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/30—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
- H10B12/31—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells having a storage electrode stacked over the transistor
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/30—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
- H10B12/48—Data lines or contacts therefor
- H10B12/485—Bit line contacts
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/30—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
- H10B12/48—Data lines or contacts therefor
- H10B12/488—Word lines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/10—Applying interconnections to be used for carrying current between separate components within a device
- H01L2221/1068—Formation and after-treatment of conductors
- H01L2221/1073—Barrier, adhesion or liner layers
Definitions
- the present disclosure relates to the field of semiconductor technology, and in particular, to a semiconductor structure and a method for manufacturing the semiconductor structure.
- the present disclosure provides a semiconductor structure and a method for fabricating the semiconductor structure to improve the performance of the semiconductor structure.
- a semiconductor structure comprising:
- the word line is located in the substrate, and a bit line contact hole is arranged between two adjacent word lines;
- bit line contact plug the bit line contact plug is located in the bit line contact hole
- the first isolation layer is located on the sidewall of the bit line contact hole and covers the sidewall of the bit line contact plug.
- the first isolation layer includes a silicon oxide layer and a silicon nitride layer, the silicon oxide layer is in contact with the sidewall of the bit line contact hole, and the silicon nitride layer is in contact with the bit line contact plug.
- the bottom end of the first isolation layer is flush with the bottom end of the bit line contact plug, and/or the first isolation layer is not lower than the upper surface of the substrate.
- the bit line contact plug is a multi-layer structure, and the material of the multi-layer structure includes polysilicon and metal materials.
- the bit line contact plug has a three-layer structure, wherein a metal material is sandwiched between two layers of polysilicon.
- the metal material is no higher than the upper surface of the substrate.
- the bit line contact plug includes polysilicon.
- the semiconductor structure further includes:
- the second isolation layer is located on the word line
- the word line surface layer is located in a second isolation layer, and the second isolation layer covers the sidewalls and bottom walls of the wordline surface layer;
- bit line contact plug is located between two adjacent second isolation layers.
- the semiconductor structure further includes:
- the nitride layer is located between the second isolation layer and the word line.
- the bottom end of the first isolation layer is higher than the bottom end of the second isolation layer.
- the semiconductor structure further includes:
- Capacitors are located on the substrate.
- a method for fabricating a semiconductor structure comprising:
- a word line is formed in the substrate, and a bit line contact hole is formed between two adjacent word lines;
- a bit line contact plug is formed in the first isolation layer, and the first isolation layer covers sidewalls of the bit line contact plug.
- bit line contact plugs includes:
- Polysilicon is overlaid on the metal material.
- the method before forming the first isolation layer, the method further includes:
- a wordline surface layer is formed in the second isolation layer, and the second isolation layer covers sidewalls and bottom walls of the wordline surface layer.
- forming the first isolation layer includes:
- An opening is formed on the substrate, and the second isolation layer is exposed, and the opening is used as a bit line contact hole;
- a first isolation layer is formed on the sidewall of the opening.
- the first isolation layer is covered on the sidewall of the bit line contact hole, that is, the first isolation layer is provided between the bit line contact plug and the sidewall of the bit line contact hole, so that the bit line contact hole can be reduced.
- the coupling effect between the line contact plug and the word line thereby improving the performance of the semiconductor structure.
- FIG. 1 is a schematic structural diagram of a semiconductor structure according to an exemplary embodiment
- FIG. 2 is a schematic flowchart of a method for manufacturing a semiconductor structure according to an exemplary embodiment
- FIG. 3 is a schematic structural diagram showing a second isolation layer obtained by a method for manufacturing a semiconductor structure according to an exemplary embodiment
- FIG. 4 is a schematic structural diagram of a word line surface layer obtained by a method for manufacturing a semiconductor structure according to an exemplary embodiment
- FIG. 5 is a schematic structural diagram showing a first isolation layer obtained by a method for manufacturing a semiconductor structure according to an exemplary embodiment
- FIG. 6 is a schematic structural diagram of a bit line contact plug obtained by a method for manufacturing a semiconductor structure according to an exemplary embodiment.
- the semiconductor structure includes: a substrate 10; Line contact hole 11; bit line contact plug 30, the bit line contact plug 30 is located in the bit line contact hole 11; the first isolation layer 40, the first isolation layer 40 is located on the sidewall of the bit line contact hole 11, and covers the bit line contact hole 11; The line contacts the sidewalls of the plug 30 .
- the first isolation layer 40 is covered on the side wall of the bit line contact hole 11 , that is, the first isolation layer 40 is provided between the bit line contact plug 30 and the side wall of the bit line contact hole 11 .
- the isolation layer 40 can reduce the coupling effect between the bit line contact plug 30 and the word line 20, thereby improving the performance of the semiconductor structure.
- the word line 20 is a buried word line, there is a bit line contact hole 11 between the two word lines 20, and the bottom wall of the bit line contact hole 11 is higher than the top surface of the word line 20, that is, the bit line contacts The bottom surface of the plug 30 is higher than the top surface of the word line 20 .
- the substrate 10 may comprise a semiconductor substrate.
- the semiconductor substrate may be formed of a silicon-containing material.
- the semiconductor substrate may be formed of any suitable material, including, for example, at least one of silicon, single crystal silicon, polycrystalline silicon, amorphous silicon, silicon germanium, single crystal silicon germanium, polycrystalline silicon germanium, and carbon-doped silicon.
- the word line 20 includes a metal material, and the metal material may include tungsten nitride (WN), molybdenum nitride (MoN), titanium nitride (TIN), tantalum nitride (TaN), titanium silicon nitride ( At least one of TiSiN), tantalum silicon nitride (TaSiN) or tungsten (W).
- WN tungsten nitride
- MoN molybdenum nitride
- TiN titanium nitride
- TaN tantalum nitride
- TiSiN tantalum silicon nitride
- TaSiN tantalum silicon nitride
- W tungsten
- the semiconductor structure further includes a bit line 50 located on the bit line contact plug 30 , that is, the bit line 50 is connected to the bit line contact plug 30 .
- the bit line 50 includes a metal material
- the metal material may include tungsten nitride (WN), molybdenum nitride (MoN), titanium nitride (TIN), tantalum nitride (TaN), titanium silicon nitride ( At least one of TiSiN), tantalum silicon nitride (TaSiN) or tungsten (W).
- WN tungsten nitride
- MoN molybdenum nitride
- TiN titanium nitride
- TaN tantalum nitride
- TiSiN tantalum silicon nitride
- TaSiN tantalum silicon nitride
- W tungsten
- bit line 50 covers the upper surface of the bit line contact plug 30 .
- the first isolation layer 40 includes a silicon oxide layer and a silicon nitride layer, the silicon oxide layer is in contact with the sidewall of the bit line contact hole 11 , and the silicon nitride layer is in contact with the bit line contact plug 30 .
- the metal material is disposed in the bit line contact plug 30, the disposition of the silicon nitride layer can prevent the metal material in the bit line contact plug 30 from diffusing into the silicon oxide layer.
- the bit line contact plug 30 includes polysilicon 31 and a metal material 32 .
- the silicon nitride layer may only cover the metal material 32 , or may completely cover the bit line contact plug 30 .
- the bit line contact plug 30 includes two layers of polysilicon 31 and a metal material 32 in the middle.
- the silicon nitride layer may only cover the upper polysilicon 31 and the metal material 32, but not cover the lower polysilicon 31. This arrangement can not only isolate the metal material and the silicon oxide layer, but also increase the contact area between the underlying polysilicon 31 and the substrate 10, and further reduce the contact resistance.
- bit line contact plug 30 includes the metal material 32
- the resistance value of the bit line contact plug 30 can be reduced, and when the underlying polysilicon 31 does not cover the silicon nitride layer, the lower polysilicon 31 and the substrate 10 can be increased. the contact area, thus further reducing the contact resistance.
- the thickness of the silicon nitride layer may be smaller than the thickness of the silicon oxide layer, for example, the thickness of the silicon nitride layer may be 1 nm-3 nm, and the specific thickness of the silicon nitride layer is 2.5nm or 3nm.
- the bottom end of the first isolation layer 40 is flush with the bottom end of the bit line contact plug 30 , and/or the first isolation layer 40 is not lower than the upper surface of the substrate 10 .
- the upper surface of the first isolation layer 40 may be flush with the upper surface of the substrate 10 , or the upper surface of the first isolation layer 40 may be higher than the upper surface of the substrate 10 , that is, the bit line contact plug 30 protrudes from the substrate 10 surface.
- the bit line contact plug 30 is a multi-layer structure, and the material of the multi-layer structure includes polysilicon 31 and metal material 32 .
- the setting of the metal material 32 can reduce the resistance value of the bit line contact plug 30.
- the metal material 32 can be copper (Cu), aluminum (Al), tungsten (W) or its alloy, etc., which is not further limited here, and can be based on actual conditions. needs to choose.
- the bit line contact plug 30 has a three-layer structure, wherein a metal material 32 is sandwiched between two layers of polysilicon 31 .
- the polysilicon 31 is ion-doped, and the doping element can be boron (B), phosphorus (P) or arsenic (As), and in this embodiment, it can be doped phosphorus (P) element. In other embodiments, ions of other elements may also be doped.
- the ion doping concentrations of the two layers of polysilicon 31 may be equal.
- the ion doping concentrations of the two layers of polysilicon 31 may not be equal.
- the ion doping concentration of the lower polysilicon 31 is higher than that of the upper polysilicon 31. In this case, the lower polysilicon 31 has a higher ion doping concentration. , the contact resistance with the active region of the substrate 10 can be reduced, and the ion doping concentration of the upper polysilicon 31 is low, which can further reduce the coupling effect between the bit line contact plug 30 and the word line 20 .
- the ion doping concentration of the upper layer polysilicon 31 may be 1E20 ⁇ 1E21, and the ion doping concentration of the lower layer polysilicon 31 may be 5E20 ⁇ 5E21.
- the metal material 32 is not higher than the upper surface of the substrate 10 , that is, the metal material 32 is all located in the bit line contact hole 11 , and the upper surface of the bit line contact plug 30 may be higher than the upper surface of the substrate 10 .
- the bit line contact plug 30 includes polysilicon 31 .
- the polysilicon 31 has ion doping to meet the electrical conductivity requirements, and the polysilicon 31 can be doped with phosphorus (P).
- the bit line contact plug 30 is composed of only ion-doped polysilicon 31 .
- the semiconductor structure further includes: a second isolation layer 70 located on the word line 20 ; a word line surface layer 60 located on the second isolation layer Inside 70 , the second isolation layer 70 covers the sidewalls and the bottom wall of the word line surface layer 60 ; wherein, the bit line contact plug 30 is located between two adjacent second isolation layers 70 .
- the word line surface layer 60 and the second isolation layer 70 are also filled in the substrate 10 to bury the word line 20 in the substrate 10 and achieve insulating isolation.
- the semiconductor structure further includes: a nitride layer, the nitride layer is located between the second isolation layer 70 and the word line 20 , so as to prevent the metal material of the word line 20 from diffusing into the second isolation layer 70 .
- the thickness of the nitride layer is smaller than the thickness of the second isolation layer 70 .
- the nitride layer may include silicon nitride
- the second isolation layer 70 may include silicon oxide.
- the word line surface layer 60 includes silicon nitride, that is, the second isolation layer 70 and the word line surface layer 60 may form an ONO layer structure of silicon oxide-silicon nitride-silicon oxide.
- the bottom end of the first isolation layer 40 is higher than the bottom end of the second isolation layer 70 .
- the thickness of the second isolation layer 70 is greater than the thickness of the third isolation layer 80 .
- the first isolation layer 40 is in contact with the second isolation layer 70 .
- the semiconductor structure further includes: a third isolation layer 80 , the third isolation layer 80 is located in the substrate 10 and covers the sidewalls and bottom walls of the word lines 20 ; wherein the third isolation layer 80 is The top end of the isolation layer 80 is in contact with the bottom end of the second isolation layer 70 .
- the third isolation layer 80 includes a silicon oxide layer and a work function layer, the work function layer is in contact with the word line 20 , and the silicon oxide layer is in contact with the substrate 10 .
- the semiconductor structure further includes a capacitor 90 located on the substrate 10 .
- the capacitor 90 and the bit line 50 are located on both sides of the word line 20, respectively.
- An embodiment of the present disclosure also provides a method for fabricating a semiconductor structure. Please refer to FIG. 2 .
- the method for fabricating a semiconductor structure includes:
- the sidewalls of the bit line contact holes 11 are covered with a first isolation layer 40 and the bit line contact plugs 30 are formed in the first isolation layer 40 , so that the bit line A first isolation layer 40 is formed between the contact plug 30 and the sidewall of the bit line contact hole 11 , the first isolation layer 40 can reduce the coupling effect between the bit line contact plug 30 and the word line 20 , thereby improving the semiconductor performance of the structure.
- word lines 20 is not limited here, and can be formed according to methods in the related art.
- a trench is etched in the substrate 10 , a third isolation layer 80 is covered on the trench wall of the trench, and then conductive material is filled into the third isolation layer 80 to form the word line 20 .
- the third isolation layer 80 may include a silicon oxide layer and a work function layer, that is, the silicon oxide layer is first covered on the groove wall of the trench, then the silicon oxide layer is covered with the work function layer, and finally the word line 20 is formed in the work function layer. .
- the word line 20 may include tungsten nitride (WN), molybdenum nitride (MoN), titanium nitride (TIN), tantalum nitride (TaN), titanium silicon nitride (TiSiN), tantalum silicon nitride (TaSiN) ) or at least one of tungsten (W).
- WN tungsten nitride
- MoN molybdenum nitride
- TiN titanium nitride
- TaN tantalum nitride
- TiSiN titanium silicon nitride
- TaSiN tantalum silicon nitride
- W tungsten
- a method of fabricating a semiconductor structure includes forming bit line 50 on bit line contact plug 30 , and forming capacitor 90 on substrate 10 .
- the bit line 50 may include tungsten nitride (WN), molybdenum nitride (MoN), titanium nitride (TIN), tantalum nitride (TaN), titanium silicon nitride (TiSiN), tantalum nitride At least one of silicon (TaSiN) or tungsten (W).
- WN tungsten nitride
- MoN molybdenum nitride
- TiN titanium nitride
- TaN titanium silicon nitride
- TiSiN tantalum nitride
- W tantalum nitride At least one of silicon (TaSiN) or tungsten (W).
- forming the bit line contact plug 30 includes: covering the polysilicon 31 in the first isolation layer 40 , the polysilicon 31 covering the bit line contact hole 11 ; covering the polysilicon 31 with a metal material 32 ; The polysilicon 31 is covered.
- the bit line contact plug 30 is formed of three layers of materials. First, the first isolation layer 40 is filled with polysilicon 31, that is, the lower layer polysilicon 31 is formed. The material 32 and the metal material 32 are also located in the bit line contact hole 11 , and the metal material 32 is not higher than the upper surface of the substrate 10 .
- the formed polysilicon 31 has ion doping, wherein, the polysilicon material with ion doping can be directly filled into the first isolation layer 40, or the polysilicon without ion doping can be filled first, and then the polysilicon filling can be completed. Then, ion implantation is performed to form polysilicon 31 with ion doping.
- the specific formation method is not limited here, and can be selected according to actual needs.
- the polysilicon 31 can be doped with phosphorus (P).
- the doping element can also be boron (B), arsenic (As) or other ions.
- the ion doping concentration of the two-layer polysilicon 31 can be equal.
- the ion doping concentrations of the two layers of polysilicon 31 may not be equal.
- the ion doping concentration of the lower polysilicon 31 is higher than that of the upper polysilicon 31, and the ion doping concentration of the upper polysilicon 31 may be 1E20 ⁇ 1E21 , the ion doping concentration of the lower polysilicon 31 may be 5E20 ⁇ 5E21.
- the metal material 32 may be copper (Cu), aluminum (Al), tungsten (W) or alloys thereof, or the like.
- forming the bit line contact plug 30 includes: filling the first isolation layer 40 with polysilicon 31 , that is, forming the bit line contact plug 30 only from the polysilicon 31 , and the polysilicon 31 may be doped with phosphorus (P).
- the method before forming the first isolation layer 40 , the method further includes: forming a second isolation layer 70 on the word line 20 ; forming a word line surface layer 60 in the second isolation layer 70 , the second isolation layer 70 covering Side walls and bottom walls of the word line surface layer 60 .
- a trench is formed in the substrate 10 , a third isolation layer 80 and the word line 20 are formed at the lower part of the trench, and then a second isolation layer is formed on the upper surface of the third isolation layer 80 and the word line 20 layer 70 , the second isolation layer 70 covers the sidewalls of the trenches and the third isolation layer 80 and the upper surfaces of the word lines 20 .
- a nitride layer may be formed on the upper surface of the word line 20, and then the second isolation layer 70, the second isolation layer 70 and the third isolation layer may be formed on the nitride layer.
- the silicon oxide layer 80 is connected, and the second isolation layer 70 may include silicon oxide.
- the nitride layer may include silicon nitride.
- the nitride layer may be formed by a remote plasma nitridition (RPN) process.
- the word line surface layer 60 is formed in the second isolation layer 70 .
- the word line surface layer 60 includes silicon nitride.
- the third isolation layer 80, the second isolation layer 70 and the word line surface layer 60 can be obtained by adopting a physical vapor deposition (Physical Vapor Deposition, PVD) process, a chemical vapor deposition (Chemical Vapor Deposition, CVD) process or atomic Layer deposition (Atomic Layer Deposition, ALD) process formation.
- PVD Physical Vapor Deposition
- CVD chemical vapor deposition
- ALD atomic Layer deposition
- etching or chemical mechanical polishing Chemical Mechanical Polishing, CMP
- CMP chemical mechanical polishing
- forming the first isolation layer 40 includes: forming an opening 12 on the substrate 10 and exposing the second isolation layer 70 , and the opening 12 is used as the bit line contact hole 11 ; forming the first isolation layer on the sidewall of the opening 12 isolation layer 40 .
- an opening 12 is formed between the two second isolation layers 70 , and a first isolation layer 40 is formed in the opening 12 .
- the first isolation layer 40 may be formed by adopting a physical vapor deposition (Physical Vapor Deposition, PVD) process, a chemical vapor deposition (Chemical Vapor Deposition, CVD) process or an atomic layer deposition (Atomic Layer Deposition, ALD) process.
- PVD Physical Vapor Deposition
- CVD chemical vapor deposition
- ALD atomic layer deposition
- an atomic layer deposition process is used to deposit an isolation layer on the bit line contact hole 11 , the bottom isolation layer of the bit line contact hole 11 and the isolation layer on the upper surface of the substrate are removed by etching, and the side of the bit line contact hole 11 is reserved
- the isolation layer of the wall forms the first isolation layer 40 , thereby forming the structure shown in FIG. 5 . Referring to FIG.
- the polysilicon 31 , the metal material 32 and the polysilicon 31 are filled in the first isolation layer 40 in sequence to form the bit line contact plug 30 , and the bit line 50 is formed on the bit line contact plug 30 , and the A capacitor 90 is formed on the substrate 10, thereby forming the semiconductor structure shown in FIG. 1 .
- the first isolation layer 40 includes a silicon oxide layer and a silicon nitride layer, that is, a silicon oxide layer is first formed on the sidewall of the bit line contact hole 11 (ie, the sidewall of the opening 12 ), and then the silicon oxide layer is formed on the sidewall of the bit line contact hole 11 (ie, the sidewall of the opening 12 ).
- a silicon nitride layer is formed on the sidewall of the silicon nitride layer, and finally a bit line contact plug 30 is formed in the silicon nitride layer.
- the thickness of the silicon nitride layer may be 1 nm-3 nm.
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Abstract
Description
Claims (15)
- 一种半导体结构,其特征在于,包括:衬底;字线,所述字线位于所述衬底内,相邻两个所述字线之间具有位线接触孔;位线接触插塞,所述位线接触插塞位于所述位线接触孔内;第一隔离层,所述第一隔离层位于所述位线接触孔的侧壁,且覆盖所述位线接触插塞的侧壁。
- 根据权利要求1所述的半导体结构,其特征在于,所述第一隔离层包括氧化硅层和氮化硅层,所述氧化硅层与所述位线接触孔的侧壁相接触,所述氮化硅层与所述位线接触插塞相接触。
- 根据权利要求1所述的半导体结构,其特征在于,所述第一隔离层的底端与所述位线接触插塞的底端平齐,和/或,所述第一隔离层不低于所述衬底上表面。
- 根据权利要求1至3中任一项所述的半导体结构,其特征在于,所述位线接触插塞为多层结构,所述多层结构的材料包括多晶硅和金属材料。
- 根据权利要求4所述的半导体结构,其特征在于,所述位线接触插塞为三层结构,其中两层所述多晶硅之间夹设有所述金属材料。
- 根据权利要求4所述的半导体结构,其特征在于,所述金属材料不高于所述衬底上表面。
- 根据权利要求1所述的半导体结构,其特征在于,所述位线接触插塞包括多晶硅。
- 根据权利要求1所述的半导体结构,其特征在于,所述半导体结构还包括:第二隔离层,所述第二隔离层位于所述字线上;字线表面层,所述字线表面层位于所述第二隔离层内,所述第二隔离层覆盖所述字线表面层的侧壁和底壁;其中,所述位线接触插塞位于相邻两个所述第二隔离层之间。
- 根据权利要求8所述的半导体结构,其特征在于,所述半导体结构还包括:氮化层,所述氮化层位于所述第二隔离层与所述字线之间。
- 根据权利要求8所述的半导体结构,其特征在于,所述第一隔离层的底端高于所述第二隔离层的底端。
- 根据权利要求1所述的半导体结构,其特征在于,所述半导体结构还包括:电容器,所述电容器位于所述衬底上。
- 一种半导体结构的制造方法,其特征在于,包括:提供衬底;在所述衬底内形成字线,相邻两个所述字线之间形成位线接触孔;在所述位线接触孔的侧壁上形成第一隔离层;在所述第一隔离层内形成位线接触插塞,所述第一隔离层覆盖所述位线接触插塞的侧壁。
- 根据权利要求12所述的半导体结构的制造方法,其特征在于,形成所述位线接触插塞,包括:在所述第一隔离层内覆盖多晶硅,所述多晶硅覆盖所述位线接触孔;在所述多晶硅上覆盖金属材料;在所述金属材料上覆盖多晶硅。
- 根据权利要求12所述的半导体结构的制造方法,其特征在于,在形成第一隔离层之前,还包括:在所述字线上形成第二隔离层;在所述第二隔离层内形成字线表面层,所述第二隔离层覆盖所述字线表面层的侧壁和底壁。
- 根据权利要求14所述的半导体结构的制造方法,其特征在于,形成所述第一隔离层,包括:在所述衬底上形成开口,且露出所述第二隔离层,所述开口作为所述位线接触孔;在所述开口的侧壁形成所述第一隔离层。
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EP21859823.3A EP4109533A4 (en) | 2020-08-27 | 2021-06-22 | SEMICONDUCTOR STRUCTURE AND METHOD FOR PRODUCING A SEMICONDUCTOR STRUCTURE |
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CN114121880B (zh) | 2023-05-05 |
US20220068936A1 (en) | 2022-03-03 |
US11871561B2 (en) | 2024-01-09 |
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JP7462064B2 (ja) | 2024-04-04 |
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