WO2019241183A1 - Compositions and methods using same for deposition of silicon-containing film - Google Patents
Compositions and methods using same for deposition of silicon-containing film Download PDFInfo
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- WO2019241183A1 WO2019241183A1 PCT/US2019/036456 US2019036456W WO2019241183A1 WO 2019241183 A1 WO2019241183 A1 WO 2019241183A1 US 2019036456 W US2019036456 W US 2019036456W WO 2019241183 A1 WO2019241183 A1 WO 2019241183A1
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/04—Coating on selected surface areas, e.g. using masks
- C23C16/045—Coating cavities or hollow spaces, e.g. interior of tubes; Infiltration of porous substrates
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/32—Carbides
- C23C16/325—Silicon carbide
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/308—Oxynitrides
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/34—Nitrides
- C23C16/345—Silicon nitride
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/36—Carbonitrides
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/40—Oxides
- C23C16/401—Oxides containing silicon
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/448—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials
- C23C16/4488—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials by in situ generation of reactive gas by chemical or electrochemical reaction
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
- C23C16/513—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using plasma jets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/0217—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
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- H—ELECTRICITY
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- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02205—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition
- H01L21/02208—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si
- H01L21/02211—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound being a silane, e.g. disilane, methylsilane or chlorosilane
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- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02205—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition
- H01L21/02208—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si
- H01L21/02219—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound comprising silicon and nitrogen
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/02274—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition in the presence of a plasma [PECVD]
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45553—Atomic layer deposition [ALD] characterized by the use of precursors specially adapted for ALD
Definitions
- compositions for forming a silicon-containing film in a deposition process such as, without limitation, a flowable chemical vapor deposition.
- PECVD plasma-enhanced chemical vapor deposition
- silicon-containing films such as SiCO, SiCON, SiCN
- SiCO silicon-containing gap-fill films
- SiCON silicon-containing gap-fill films
- US2008/0025907 discloses a process of forming a silicon-containing film on a substrate by what is known as flowable CVD or FCVD.
- FCVD flowable CVD
- the FCVD process is useful for many applications including depositing a gap-fill film in high aspect ratio structures with small dimensions.
- a precursor is exposed to reactive radicals to initiate a radical induced polymerization in a deposition chamber.
- the reactive radicals are produced using plasma energy.
- the plasma can be generated or ignited within the processing chamber (e.g. a direct or in-situ plasma) or can be generated outside of the processing chamber and flowed into the processing chamber (e.g. a remote plasma).
- the silicon-containing film is selected from the group consisting of a silicon nitride, a silicon carbide, a silicon oxide, a carbon-doped silicon nitride, a silicon oxynitride, and a carbon-doped silicon oxynitride film.
- the substrate comprises a surface feature.
- surface feature means that the substrate or partially fabricated substrate that comprises one or more of the following pores, trenches, shallow trench isolation (STI), vias, reentrant feature, or the like.
- the compositions can be pre-mixed compositions, pre-mixtures (mixed before being used in the deposition process), or in-situ mixtures (mixed during the deposition process).
- a method for depositing a silicon-containing film in a flowable chemical vapor deposition process A substrate that includes a surface feature is placed into a reactor which is at one or more temperatures ranging from -20°C to about 100°C.
- a composition is introduced into the reactor, and the composition includes at least one compound having the formula R n SiRV n wherein R is selected from a linear or branched C 2 to C 6 alkenyl group, a linear or branched C 2 to C 6 alkynyl group; R 1 is selected from hydrogen, methyl and a linear or branched C 2 to Ci 0 alkyl group; and n is a number selected from 1 , 2, 3, and 4.
- a plasma cource is provided into the reactor to at least partially react the at least one compound to form a flowable liquid oligomer. The flowable liquid oligomer at least partially fills at least a portion of the surface feature.
- the plasma source includes both a remote plasma source and an in-situ plasma source operating in combination.
- At least one of the remote plasma source and the in- situ plasma source comprises a plasma source is selected from the group consisting of a nitrogen plasma, plasma comprising nitrogen and helium, a plasma comprising nitrogen and argon, an ammonia plasma, a plasma comprising ammonia and helium, a plasma comprising ammonia and argon, helium plasma, argon plasma, hydrogen plasma, a plasma comprising hydrogen and helium, a plasma comprising hydrogen and argon, a plasma comprising ammonia and hydrogen, an organic amine plasma, a plasma comprising oxygen, a plasma comprising oxygen and hydrogen, and mixtures thereof.
- the plasma source for the remote plasma source and/or the in-situ plasma source is selected from the group consisting of a carbon source plasma, including a hydrocarbon plasma, a plasma comprising hydrocarbon and helium, a plasma comprising hydrocarbon and argon, carbon dioxide plasma, carbon monoxide plasma, a plasma comprising hydrocarbon and hydrogen, a plasma comprising hydrocarbon and a nitrogen source, a plasma comprising hydrocarbon and an oxygen source, and mixture thereof.
- a carbon source plasma including a hydrocarbon plasma, a plasma comprising hydrocarbon and helium, a plasma comprising hydrocarbon and argon, carbon dioxide plasma, carbon monoxide plasma, a plasma comprising hydrocarbon and hydrogen, a plasma comprising hydrocarbon and a nitrogen source, a plasma comprising hydrocarbon and an oxygen source, and mixture thereof.
- the flowable liquid or oligomer is treated at one or more temperatures ranging from about 100 °C to about 1000 °C to densify at least a portion of the materials.
- the post thermal treatment materials are exposed to a plasma, infrared lights, chemical treatment, an electron beam, or UV light to form a dense film.
- steps of the methods described herein define one cycle for the methods described herein; and the cycle can be repeated until the desired thickness of a silicon-containing film is obtained.
- steps of the methods described herein may be performed in a variety of orders, may be performed sequentially or concurrently (e.g., during at least a portion of another step), and any combination thereof.
- FIG. 1 is an SEM micrograph showing the results of Example 1 ;
- FIG. 2 is an SEM micrograph showing the results of Example 2
- FIG. 3 is an SEM micrograph showing the results of Example 3.
- FIG. 4 is an SEM micrograph showing the results of Example 5.
- FCVD methods for depositing a silicon-containing film in a flowable chemical vapor deposition process, the method comprising: placing a substrate comprising a surface feature into a reactor which is at one or more temperatures ranging from -20°C to about 100°C; introducing into the reactor a composition comprising at least one compound having the formula R n SiRV n wherein R is selected a linear or branched C 2 to C 6 alkenyl group, a linear or branched C 2 to C 6 alkynyl group; R 1 is selected from hydrogen and a branched Ci to Ci 0 alkyl group; and n is a number selected from 1 , 2, 3 and 4; and providing a plasma source into the reactor to at least partially react the at least one compound to form a flowable liquid oligomer, wherein the flowable liquid oligomer at least partially fills at least a portion of the surface feature, wherein the plasma source comprises both a remote plasma source and an in-situ
- Films deposited by, for example, flowable chemical deposition treatment typically experience film shrinkage during post-treatment due to the low process temperature. Voids and seams can form in the film due to significant film shrinkage and the increase of film stress. Thus, it has been challenging to densify the film without increasing film stress or creating voids.
- the composition and method described herein overcomes these problems by improving the fill of at least a portion of a surface feature on a substrate by using the disclosed precursors and compositions comprising the disclosed precursors.
- Embodiments of the disclosure provide methods of depositing a gap-fill film (e.g., SiC, SiCO, SiCN, SiCON) in high aspect ratio (AR) structures with small dimensions.
- a gap-fill film e.g., SiC, SiCO, SiCN, SiCON
- Some embodiments advantageously provide methods involving cyclic deposition-treatment processes that can be performed in a cluster tool environment.
- Some embodiments advantageously provide seam-free high quality silicon-containing films to fill up high AR trenches with small dimensions.
- Some embodiments advantageously provide films containing high carbon content.
- the high carbon content films can be advantageously used in hard mask and low-k flowable applications.
- One or more embodiments of the disclosure are directed to processes where flowable silicon-containing films are deposited which are able to fill high aspect ratio structures (e.g., AR>8:1).
- Embodiments of the disclosure provide new precursors to generate SiC, SiOC, SiCN, SiOCN, SiO and SiN flowable films using F-CVD (flowable chemical vapor deposition) for gap-fill applications.
- the precursors of various embodiments include alkenyl (vinyl) and/or alkynyl groups.
- the precursors are exposed to reactive radicals to initiate a radical induced polymerization in the deposition chamber.
- a "substrate” as used herein, refers to any substrate or material surface formed on a substrate upon which film processing is performed during a fabrication process.
- a substrate surface on which processing can be performed include materials such as silicon, silicon oxide, strained silicon, silicon on insulator (SOI), carbon doped silicon oxides, amorphous silicon, doped silicon, germanium, gallium arsenide, glass, sapphire, and any other materials such as metals, metal nitrides, metal alloys, and other conductive materials, depending on the application.
- Substrates include, without limitation,
- substrate surface is intended to include such underlayer as the context indicates. Thus for example, where a film/layer or partial film/layer has been deposited onto a substrate surface, the exposed surface of the newly deposited film/layer becomes the substrate surface.
- the method deposits a film upon at least a portion of the surface of a substrate comprising a surface feature.
- the substrate is placed into the reactor and the substrate is maintained at one or more temperatures ranging from about -20°C to about 100°C. In one particular embodiment, the temperature of the substrate is less than the walls of the chamber.
- the substrate temperature is held at a temperature below 100 °C, preferably at a temperature below 25 °C and most preferably below 10 °C and greater than - 20 °C.
- the aspect ratio (the depth to width ratio) of the surface features, if present, is
- 0.1 :1 or greater or 1 :1 or greater, or 10:1 or greater, or 20:1 or greater, or 40:1 or greater.
- the substrate may be a single crystal silicon wafer, a wafer of silicon carbide, a wafer of aluminum oxide (sapphire), a sheet of glass, a metallic foil, an organic polymer film or may be a polymeric, glass, silicon or metallic 3-dimensional article.
- the substrate may be coated with a variety of materials well known in the art including films of silicon oxide, silicon nitride, amorphous carbon, silicon oxycarbide, silicon oxynitride, silicon carbide, gallium arsenide, gallium nitride and the like. These coatings may completely coat the substrate, may be in multiple layers of various materials and may be partially etched to expose underlying layers of material.
- the surface may also have on it a photoresist material that has been exposed with a pattern and developed to partially coat the substrate.
- the substrate comprises at least one member selected from the group consisting of Si, SiO x , SiN, SiGe, SiOC and SiON.
- the inventive silicon containing film can be employed as a hard mask and provide etch selectivity to a photoresist.
- the inventive silicon containing film functions as a dielectric film between conductive materials, as a barrier between conductive and other dielectric, or as a film within a sandwich dielectric.
- the precursors, reagents and sources used herein may be sometimes described as “gaseous”, it is understood that the precursors can be either liquid or solid which are transported with or without an inert gas into the reactor via direct vaporization, bubbling or sublimation.
- the vaporized precursors can pass through a plasma generator.
- the films are deposited using a plasma-based (e.g., remote generated or in situ) CVD process.
- reactor includes without limitation, a reaction chamber or deposition chamber.
- the method of the present development also comprises the step of introducing into the reactor a composition comprising at least one compound having the formula R n SiR 1 4.n wherein R is selected a linear or branched C 2 to C 6 alkenyl group, a linear or branched C 2 to C 6 alkynyl group; R 1 is selected from hydrogen and a branched Ci to Ci 0 alkyl group; and n is a number selected from 1 , 2, 3 and 4.
- R is selected a linear or branched C 2 to C 6 alkenyl group, a linear or branched C 2 to C 6 alkynyl group
- R 1 is selected from hydrogen and a branched Ci to Ci 0 alkyl group
- n is a number selected from 1 , 2, 3 and 4.
- Exemplary compounds for Formula I include, but not limited to, the following:
- linear or branched alkyl denotes a linear functional group having from 1 to 10, 3 to 10, or 1 to 6 carbon atoms.
- branched alkyl denotes a linear functional group having from 3 to 10, or 1 to 6 carbon atoms.
- Exemplary linear or branched alkyl groups include, but are not limited to, methyl (Me), ethyl (Et), isopropyl (Pr 1 ), isobutyl (Bu 1 ), sec-butyl (Bu s ), tert-butyl (Bu‘), iso-pentyl, tert-pentyl (am), isohexyl, and neohexyl.
- the alkyl group may have one or more functional groups such as, but not limited to, an alkoxy group, a dialkylamino group or combinations thereof, attached thereto. In other embodiments, the alkyl group does not have one or more functional groups attached thereto.
- the alkyl group may be saturated or, alternatively, unsaturated.
- cyclic alkyl denotes a cyclic group having from 3 to 10 or 5 to 10 atoms.
- exemplary cyclic alkyl groups include, but are not limited to, cyclobutyl, cyclopentyl, cyclohexyl, and cyclooctyl groups.
- the cyclic alkyl group may have one or more Ci to Ci 0 linear, branched substituents, or substituents containing oxygen or nitrogen atoms.
- the cyclic alkyl group may have one or more linear or branched alkyls or alkoxy groups as substituents, such as, for example, a methylcyclohexyl group or a methoxycyclohexyl group.
- aryl denotes an aromatic cyclic functional group having from 3 to 10 carbon atoms, from 5 to 10 carbon atoms, or from 6 to 10 carbon atoms.
- exemplary aryl groups include, but are not limited to, phenyl, benzyl, chlorobenzyl, tolyl, and o-xylyl.
- alkenyl group denotes a group which has one or more carbon-carbon double bonds and has from 2 to 12, from 2 to 10, or from 2 to 6 carbon atoms.
- alkenyl groups include, but are not limited to, vinyl or allyl groups.
- alkylene group denotes a group which is derived from an alkyl by removal of two hydrogen atoms.
- exemplary alkylene groups include, but are not limited to, methylene (-CH 2 -) or ethylene (-CH 2 CH 2 -) groups.
- the term“unsaturated” as used herein means that the functional group, substituent, ring or bridge has one or more carbon double or triple bonds.
- An example of an unsaturated ring can be, without limitation, an aromatic ring such as a phenyl ring.
- the term“saturated” means that the functional group, substituent, ring or bridge does not have one or more double or triple bonds.
- one or more of the alkyl group, alkenyl group, alkynyl group, aryl group, and/or cyclic alkyl group in the formulae may be“substituted” or have one or more atoms or group of atoms substituted in place of, for example, a hydrogen atom.
- substituents include, but are not limited to, oxygen, sulfur, halogen atoms (e.g.,
- alkyl groups F, Cl, I, or Br
- nitrogen alkyl groups
- alkyl groups F, Cl, I, or Br
- nitrogen alkyl groups
- phosphorous one or more of the alkyl group, alkenyl group, alkynyl group, aromatic and/or aryl group in the formulae may be unsubstituted.
- the silicon precursor compounds are preferably substantially free of halide ions such as chloride or metal ions such as Al.
- halide ions such as, for example, chlorides and fluorides, bromides, iodides, Al 3+ ions, Fe 2+ , Fe 3+ , Ni 2+ , Cr 3+ means less than 5 ppm (by weight), preferably less than 3 ppm, and more preferably less than 1 ppm, and most preferably 0 ppm.
- Chlorides or metal ions are known to act as decomposition catalysts for silicon precursors. Significant levels of chloride in the final product can cause the silicon precursors to degrade.
- silicon precursors are known to form flammable and/or pyrophoric gases upon decomposition such as hydrogen and silane. Therefore, the accelerated decomposition of the silicon precursors presents safety and performance concerns related to the formation of these flammable and/or pyrophoric gaseous byproducts.
- the precursors described herein may be delivered in neat liquid form, or alternatively, may be employed in solvent formulations or compositions comprising same.
- the precursor formulations may include solvent component(s) of suitable character as may be desirable and advantageous in a given end use application to form a film on a substrate.
- the substrate may be exposed to one or more pre deposition treatments such as, but not limited to, a plasma treatment, thermal treatment, chemical treatment, ultraviolet light exposure, electron beam exposure, and combinations thereof to affect one or more properties of the films.
- pre deposition treatments such as, but not limited to, a plasma treatment, thermal treatment, chemical treatment, ultraviolet light exposure, electron beam exposure, and combinations thereof to affect one or more properties of the films.
- These pre-deposition treatments may occur under an atmosphere selected from inert, oxidizing, and/or reducing.
- the method of the present development comprises the step of providing a plasma source into the reactor to at least partially react the at least one compound having the formula R n SiRV n to form a flowable liquid oligomer, wherein the flowable liquid oligomer at least partially fills at least a portion of the surface feature, wherein the plasma source comprises both a remote plasma source and an in-situ plasma source operating in combination.
- the process of the present development employs dual plasma sources - a remote plasma source and an in-situ RF plasma source (e.g., capacitive coupled) - to yield the deposition and post-cure films with the best gap fill properties such as being substantially free of visible voids as seen by scanning electron microscopy (SEM).
- the remote plasma source and an in-situ plasma source operating in combination, which means that both sources are energized at least part of the time during the deposition. In other embodiments, both sources are energized during at least a quarter of the time during the deposition. In other embodiments, both sources are energized during at least half of the time during the deposition. In other embodiments, both sources are energized during at least three quarters of the time during the deposition. In yet other embodiments, both sources are energized the entire time during the deposition.
- Plasma power applied to the RPS is 1000 - 3000W, preferably 2000 - 3000W.
- Plasma power to the in-situ plasma is 100 - 1000W, preferably 200 - 300W.
- Energy is applied to the at least one compound having the formula R n SiRV n and plasma sources to induce reaction and to form the flowable silicon-containing film or coating on the substrate.
- Such energy can be provided by, but not limited to, thermal, plasma, pulsed plasma, helicon plasma, high density plasma, inductively coupled plasma, X-ray, e- beam, photon, remote plasma methods, and combinations thereof.
- a secondary RF frequency source can be used to modify the plasma characteristics at the substrate surface.
- the plasma generated process may comprise a direct plasma-generated process in which plasma is directly generated in the reactor, or alternatively a remote plasma-generated process in which plasma is generated outside of the reactor and supplied into the reactor.
- organoamine examples include methylamine, ethylamine, propylamine, iso-propylamine, tert-butylamine, sec-butylamine, tert-amylamine, ethylenediamine, dimethylamine, trimethylamine, diethylamine, pyrrole, 2,6- dimethylpiperidine, di-n-propylamine, di-iso-propylamine, ethylmethylamine, N-methylaniline, pyridine, and triethylamine.
- At least one of the remote plasma source and the in-situ plasma source can comprise carbon.
- the plasma source is selected from but not limited to the group consisting of a carbon source plasma, including a hydrocarbon plasma, a plasma comprising hydrocarbon and helium, a plasma comprising hydrocarbon and argon, carbon dioxide plasma, carbon monoxide plasma, a plasma comprising hydrocarbon and hydrogen, a plasma comprising hydrocarbon and a nitrogen source, a plasma comprising hydrocarbon and an oxygen source, and mixture thereof.
- the at least one compound and carbon source react and form a silicon carbide film (which is non-stoichiometric), or a silicon carbonitride film, or a silicon oxynitride film, or a silicon oxycarbide film, or a silicon oxycarbonitrde film on at least a portion of the surface feature and substrate.
- the plasma source is selected from but not limited to hydrogen plasma, helium plasma, argon plasma, xenon plasma, and mixture thereof.
- the at least one compound and plasma react and form a silicon nitride film, or a silicon carbide film, or a silicon carbonitride film on at least a portion of the surface feature and substrate.
- At least one of the remote plasma source and the in-situ plasma source can comprise oxygen.
- the oxygen-containing source can be selected from the group consisting of water (H 2 0), oxygen (0 2 ), oxygen plasma, ozone (0 3 ), NO,
- the substrate may be (i.e., optionally) treated with an oxygen-containing source as described above under certain process conditions sufficient to make the silicon nitride film form a silicon oxide or a silicon oxynitride or carbon doped silicon oxide film.
- the reactor is at a pressure below atmospheric pressure or 750 torr (10 5 Pascals (Pa)) or less, or 100 torr (13332 Pa) or less. In other embodiments, the pressure of the reactor is maintained at a range of about 0.1 torr (13 Pa) to about 10 torr (1333 Pa).
- Flowable films as deposited, are generally not stable and age upon exposure to atmospheric conditions.
- the flowable films of some embodiments are deposited by a silicon- containing precursor and radical forms of, for example, NH 3 /0 2 as co-reactants. These films are then cured by ozone/UV/steam annealing/NH 3 annealing, etc., which results in a cured film.
- the present development teaches the use of precursor selection that will provide films with a desired silicon to carbon ratio (Si:C).
- Deposition of films using TVS has provide Si:C ratio of ca. 1 :4.
- the precursor has a Si:C of 1 :8.
- Selection of precursor with multiple Si atoms contained in a ring structure, such as that observed in 1 , 1 ,3,3-tetravinyl-1 ,3- disilacyclobutane can yield films with a higher Si:C.
- the chemical structure is projected to provide a Si:C of 1 :3.
- Use of precursors such as allyl substituted disilacyclobutanes can potentially provide lower Si:C, possibly approaching 1 :1 based on the improved potential of the allyl group as a leaving group during deposition or film curing.
- the flowable film 150 can be formed at any suitable temperature.
- the flowable film 150 is formed at a temperature in the range of about -20°C to about 100°C.
- the temperature can be kept low to preserve the thermal budget of the device being formed.
- forming the flowable film occurs at a temperature less than about 300°C, 250°C, 200°C, 150°C, 100°C, 75°C, 50°C, 25°C or 0°C.
- Films with high carbon content may have many applications, for example, in the patterning of hard masks and for flowable low K films.
- the flowable film using precursors disclosed herein can deposit films which high carbon content.
- the film has a carbon content up to about 85 atomic %.
- the flowable film has a carbon content greater than about 40, 45, 50, 55, 60, 65, 70, 75 or 80 atomic %, and less than about 95, 90 or 85 atomic %.
- the flowable film has a carbon content in the range of about 40 to about 85 atomic %, or in the range of about 50 to about 85 atomic %, or in the range of about 60 to about 80 atomic %.
- the composition of the flowable film can be adjusted by changing the composition of the reactive gas.
- the flowable film comprises one or more of SiC,
- the co-reactant may comprise, for example, one or more of oxygen, ozone or water.
- the co-reactant may comprise, for example, one or more of ammonia, hydrazine, N0 2 or N 2 .
- the reactive gas may comprise, for example, one or more of propylene and acetylene.
- the flowable film may deposit on the wafer (temperature of the wafer can be from - 10°C to 200°C) and due to their flowability, polymers will flow through trenches and make a gap-fill. Then these films are subjected curing steps such as ozone/UV/steam
- the method provides one or more of SiC, SiCO, SiCN, SiCON, SiO, and/or SiN flowable films. Accordingly, after formation of the flowable film 150, the film may be cured to solidify the flowable film and form a substantially seam-free gap-fill.
- curing the flowable film comprises exposing the flowable film to one or more of ozone, UV light, steam annealing, ammonia annealing and oxygen plasma.
- the flowable film is cured by exposing the film to a UV curing process. The UV curing process can occur at a temperature in the range of about 10°C to about 550°C.
- the UV curing process can occur for any suitable time frame necessary to sufficiently solidify the flowable film.
- the UV cure can be performed with different parameters, e.g., power, temperature, environment. In some embodiments, the UV cure occurs in an acetylene/ethylene environment.
- a method for depositing a silicon-containing film in a flowable chemical vapor deposition process comprising: placing a substrate comprising a surface feature into a reactor which is at one or more temperatures ranging from -20°C to about 100°C; introducing into the reactor a composition comprising at least one compound having the formula R n SiRV n wherein R is selected a linear or branched C 2 to C 6 alkenyl group, a linear or branched C 2 to C 6 alkynyl group; R 1 is selected from hydrogen and a branched to C 10 alkyl group; and n is a number selected from 1 , 2, 3 and 4; and providing a plasma source into the reactor to at least partially react the at least one compound to form a flowable liquid oligomer, wherein the flowable liquid oligomer at least partially fills at least a portion of the surface feature, wherein the plasma source comprises both a remote plasma source and an in-situ plasma source
- FCVD Flowable chemical vapor deposition
- Depositions on a modified FCVD chamber on an Applied Materials Precision 5000 system can be performed using either a silane or a TEOS process kit.
- the chamber has direct liquid injection (DLI) delivery capability.
- the precursors are liquids with delivery temperatures dependent on the precursor’s boiling point.
- typical liquid precursor flow rates were 100-5000 mg/min, in-situ plasma power density was 0.25 - 3.5 W/cm 2 , pressure was 0.75 - 12 Torr.
- the films were thermally annealed and/or UV cured in vacuum using the modified PECVD chamber at 100-1000 °C, preferably 300-400 °C.
- Thickness and refractive index (Rl) at 632 nm were measured by a SCI reflectometer or Woollam ellipsometer. Typical film thickness ranged from 10 to 2000 nm. Bonding properties and hydrogen content (Si-H, C-H and N-H) of the silicon-based films were measured and analyzed by a Nicolet transmission Fourier transform infrared spectroscopy (FTIR) tool. All density measurements were accomplished using X-ray reflectivity (XRR). X-ray Photoelectron Spectroscopy (XPS) and Secondary ion mass spectrometry (SIMS) analysis were performed to determine the elemental composition of the films.
- FTIR Transmission Fourier transform infrared spectroscopy
- Example 1 Deposition Conditions - 3000 W RPS; 200 W In-Situ; 2 torr; 1500 seem NH 3 ; 1500 mg/min TVS. Referring to FIG. 1 , the films exhibited voids post cure.
- Example 2 Deposition Conditions - 3000 W RPS; 200 W In-Situ; 2 torr; 1000 seem NH 3 ; 1500 mg/min TVS. Referring to FIG. 2, lower NH 3 flow reduced film voiding.
- Example 3 Deposition Conditions - 3000 W RPS; 0 W In-Situ; 2 torr; 1000 seem NH3; 1500 mg/min TVS. Referring to FIG. 3, it can be seen that turning off in-situ plasma caused pinch-off at top of feature.
- Example 4 Deposition Conditions - TVS only : 3000 W RPS; 200 W In-Situ; 2 torr; 1000 seem NH 3 ; 1500 mg/min TVS ; TVS + TSA: 3000 W RPS; 200 W In-Situ; 2 torr; 1000 seem NH 3 ; 1500 mg/min TVS + 900 seem TSA.
- Table 1 it can be seen that adding TSA to the chamber does not increase N incorporation into the film. It does activate the film for ambient oxidation.
- Example 4 Chemical composition determined by X-ray Photoelectron Spectroscopy (XPS). Some surface oxidation observed in TVS film. Bulk of film had little oxidation. Surface and bulk oxidation much greater in TVS + TSA film.
- XPS X-ray Photoelectron Spectroscopy
- Example 5 Deposition Conditions - TVS only : 0 W RPS; 200 W In-Situ; 8 torr; 400 seem NH 3 ; 2000 mg/min TVS ; 200 seem He; 5 sec deposition; referring to Fig. 4 using TVS with only in-situ plasma activation the deposited films exhibited flowability but after curing they exhibited observable porosity in the filled features. Compared to Fig 2 these films are believed to be of significantly lower density within the feature. [0071] Although certain principles of the invention have been described above in connection with aspects or embodiments, it is to be clearly understood that this description is made only by way of example and not as a limitation of the scope of the invention.
Abstract
Description
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SG11202011890XA SG11202011890XA (en) | 2018-06-11 | 2019-06-11 | Compositions and methods using same for deposition of silicon-containing film |
EP19820430.7A EP3802913A4 (en) | 2018-06-11 | 2019-06-11 | Compositions and methods using same for deposition of silicon-containing film |
JP2020568739A JP7125515B2 (en) | 2018-06-11 | 2019-06-11 | Compositions and methods of using the compositions for the deposition of silicon-containing films |
CN201980039035.7A CN112292479A (en) | 2018-06-11 | 2019-06-11 | Compositions for depositing silicon-containing films and methods of use thereof |
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