WO2007115029A2 - Method of forming mixed rare earth oxide and mixed rare earth aluminate films by atomic layer deposition - Google Patents

Method of forming mixed rare earth oxide and mixed rare earth aluminate films by atomic layer deposition Download PDF

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Publication number
WO2007115029A2
WO2007115029A2 PCT/US2007/065342 US2007065342W WO2007115029A2 WO 2007115029 A2 WO2007115029 A2 WO 2007115029A2 US 2007065342 W US2007065342 W US 2007065342W WO 2007115029 A2 WO2007115029 A2 WO 2007115029A2
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Prior art keywords
rare earth
substrate
gas
oxygen
pulse
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PCT/US2007/065342
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French (fr)
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WO2007115029A3 (en
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Robert D. Clark
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Tokyo Electron Ltd
Tokyo Electron America Inc
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Tokyo Electron Ltd
Tokyo Electron America Inc
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Priority to CN2007800201206A priority Critical patent/CN101460658B/zh
Priority to KR1020147000087A priority patent/KR20140022454A/ko
Priority to JP2009503240A priority patent/JP2009532881A/ja
Priority to KR1020087026749A priority patent/KR101366541B1/ko
Publication of WO2007115029A2 publication Critical patent/WO2007115029A2/en
Publication of WO2007115029A3 publication Critical patent/WO2007115029A3/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C16/40—Oxides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C16/455—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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C16/308—Oxynitrides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C16/448—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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C16/455—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]
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C16/455—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]
    • C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
    • C23C16/45529—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations specially adapted for making a layer stack of alternating different compositions or gradient compositions
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C16/455—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]
    • C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
    • C23C16/45531—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations specially adapted for making ternary or higher compositions
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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

Definitions

  • TTCA-127C entitled "METHOD OF FORMING MIXED RARE EARTH OXYNITRIDE AND ALUMINUM OXYNITRIDE FILMS BY ATOMIC LAYER DEPOSITION,” filed on March 31, 2006; co-pending U.S. Patent Application No. 11/278278,397 (Attorney Docket No. TTCA-127D), entitled “SEMICONDUCTOR DEVICE WITH GATE DIELECTRIC CONTAINING MIXED RARE EARTH ELEMENTS,” filed on March 31, 2006; and co-pending U.S. Patent Application No. 11/278,399 (Attorney Docket No.
  • the present invention relates to a method of forming dielectric materials for semiconductor manufacturing, and more particularly to a method of forming high dielectric constant mixed rare earth oxide and aluminate films containing a plurality of different rare earth metal elements.
  • High dielectric constant (high-k) materials are desirable for use as capacitor dielectrics and for use as gate dielectrics in future generations of electronic devices.
  • the first high-k materials used as capacitor dielectrics were tantalum oxide and aluminum oxide materials.
  • mixed hafnium aluminum oxide materials are being implemented as capacitor dielectrics in DRAM production.
  • hafnium-based dielectrics are expected to enter production as gate dielectrics, thereby replacing the current silicon oxide and silicon oxynitride materials.
  • PVD physical vapor deposition
  • CVD chemical vapor deposition
  • ALD atomic layer deposition
  • the atomic layer deposition process includes separate pulses of reactive vapor streams to a process chamber containing a substrate, where the pulses can be separated by either purging or evacuating. During each pulse, a self-limited chemisorbed layer is formed on the surface of the wafer, which layer then reacts with the component included in the next pulse. Purging or evacuation between each pulse is used to reduce or eliminate gas phase mixing of the reactive vapor streams.
  • the typical ALD process results in well-controlled sub-monolayer or near monolayer growth per cycle.
  • ALD aluminum
  • Al aluminum
  • water a pulse of trimethylaluminum will react with hydroxyl groups on the surface of a heated substrate to form a chemisorbed layer of methyl-aluminum moieties that are self-limited to less than a monolayer.
  • the reaction chamber is then purged or evacuated to remove unreacted trimethylaluminum as well as any vapor phase reaction by-products.
  • a pulse of water vapor is then introduced which reacts with the surface aluminum-methyl bonds and regenerates a hydroxylated surface.
  • Some of the benefits of these dielectrics include increased thermal stability and improved electrical properties compared with pure Zr oxide or pure Hf oxide. While all of the factors contributing to these improvements are not known, the use of the mixed Zr and Hf oxides is facilitated by the similar chemical properties of zirconium and hafnium, and by the infinite miscibility of zirconium and hafnium oxides. Other problems encountered with current high-k dielectric materials include dielectric constants that are too low compared to desired values for advanced semiconductor devices. Additionally, the dielectric constant may be further reduced by the presence of an interfacial layer between the high-k dielectric material and the underlying substrate.
  • Embodiments of the invention provide a method for depositing mixed rare earth oxide and aluminate films by ALD and plasma enhanced ALD (PEALD).
  • the mixed rare earth oxide and aluminate films contain a mixture of a plurality of different rare earth metal elements, including Y, Lu, La, Ce, Pr, Nd, Sm, Eu, Gd, Th, Dy, Ho, Er, Tm, and Yb.
  • the mixed rare earth oxide and aluminate films may be used in advanced semiconductor applications that include future generations of high-k dielectric materials for use as both capacitor and gate dielectrics.
  • a method for forming a mixed rare earth oxide film or a mixed rare earth aluminate film by disposing a substrate in a process chamber, and exposing the substrate to a gas pulse sequence to deposit a mixed rare earth oxide film or a mixed rare earth aluminate film with a desired thickness.
  • the gas pulse sequence includes, in any order: a) sequentially first, exposing the substrate to a gas pulse contain a first rare earth precursor, and second, exposing the substrate to a gas pulse containing an oxygen-containing gas; b) sequentially first, exposing the substrate to a gas pulse containing a second rare earth precursor, and second, exposing the substrate to a gas pulse containing an oxygen-containing gas, where the first and second rare earth precursors each contain a different rare earth metal element; and optionally, sequentially first, exposing the substrate to a gas pulse containing an aluminum precursor and second, exposing the substrate to a gas pulse containing the oxygen-containing gas.
  • the method further includes each of a) b) and optionally c) being optionally repeated any number of desired times, and the gas pulse sequence including a), b) and optionally c) being optionally repeated, in any order, any number of desired times to achieve the desired thickness.
  • the method further includes purging or evacuating the process chamber after at least one of the exposing steps.
  • a method for forming a mixed rare earth oxide film by a) disposing a substrate in a process chamber, b) sequentially exposing the substrate to a gas pulse comprising a plurality of rare earth precursors each containing a different rare earth metal element, c) exposing the substrate to a pulse containing an oxygen -containing gas, and d) repeating steps b) and c) a desired number of times to deposit a mixed rare earth oxide film with a desired thickness.
  • the method further includes purging or evacuating the process chamber after at least one of the exposing steps.
  • the gas pulse of step b) includes an aluminum precursor, whereby a mixed rare earth aluminate film is formed.
  • the substrate is exposed to another pulse sequence including exposure to an aluminum precursor followed by exposure to an oxygen -containing gas, whereby a mixed rare earth aluminate film is formed.
  • FIG. IA depicts a schematic view of an ALD system in accordance with an embodiment of the invention.
  • FIG. IB depicts a schematic view of a PEALD system in accordance with an embodiment of the invention.
  • FIGS. 2A - 2F schematically illustrate pulse sequences for forming mixed rare earth based films according to embodiments of the invention
  • FIGS. 3A - 3D are process flow diagrams for forming mixed rare earth oxide films according to embodiments of the invention.
  • FIGS. 4A - 4B are process flow diagrams for forming mixed rare earth nitride films according to embodiments of the invention.
  • FIGS. 5A - 5B are process flow diagrams for forming mixed rare earth oxynitride films according to embodiments of the invention.
  • FIGS. 6 A - 6B are process flow diagrams for forming mixed rare earth aluminate films according to embodiments of the invention.
  • FIGS. 7A - 7B are process flow diagrams for forming mixed rare earth aluminum nitride films according to embodiments of the invention.
  • FIGS. 8A - 8B are process flow diagrams for forming mixed rare earth aluminum oxynitride films according to embodiments of the invention.
  • FIGS. 9A and 9B schematically show cross-sectional views of semiconductor devices containing mixed rare earth based materials according to embodiments of the invention.
  • mixed rare earth based materials are likely to provide beneficial thermal and electrical characteristics for future high- k applications in semiconductor applications.
  • mixed rare earth based materials refer to materials containing a plurality of, i.e., at least two, different rare earth metal elements. Because the rare earth elements are chemically similar and practically infinitely miscible as oxides, nitrides, oxynitrides, aluminates, aluminum nitrides, and aluminum oxynitrides, they are expected to form highly stable solid solutions with other rare earth elements.
  • Expected benefits of a film containing a mixed rare earth based material incorporating a plurality of rare earth metal elements include increased thermal stability in contact with silicon or metal gate electrode material, increased crystallization temperature, increased dielectric constant compared to rare earth based materials containing a single rare earth metal element, decreased density of interface traps, decreased threshold voltage shifts and Fermi level pinning, and improved processing characteristics.
  • the mixed rare earth based films can be used in applications that include future generations of high-k dielectric materials for use as both capacitor and transistor gate dielectrics.
  • Incorporation of aluminum into a mixed rare earth oxide based material to form an aluminate structure provides increased thermal stability in contact with silicon as well as larger band gap to reduce leakage.
  • compositional ranges of mixed rare earth aluminate films using rare earth elements of differing atomic sizes may provide significantly higher dielectric constants due to the increased polarizability that can be realized from a size mismatch between the two rare earth metal ions (e.g., lanthanum (La) mixed with lutetium (Lu) aluminate).
  • Nitrogen incorporation into gate dielectric materials may provide several advantages. In some cases, improved electrical characteristics have been reported. In addition, nitrogen doped dielectrics tend to remain amorphous to higher temperatures than the pure oxide materials. Nitrogen incorporation has the additional benefits of slightly increasing the dielectric constant of the material and suppressing dopant diffusion through the material. Finally, nitrogen incorporation can help suppress interface layer growth during the film deposition and subsequent processing steps.
  • Embodiments of the invention provide a method for forming mixed rare earth based films that can be uniformly deposited with excellent thickness control over high aspect ratios that are envisioned in future DRAM and logic generations. Because CVD and PVD methods of depositing high-k films are not expected to provide the needed conformality and atomic layer control over the deposition rate, ALD and PEALD methods of depositing the high-k materials will be required for use in future generations of integrated circuits. [0027] In the following description, in order to facilitate a thorough understanding of the invention and for purposes of explanation and not limitation, specific details are set forth, such as a particular geometry of the deposition system and descriptions of various components. However, it should be understood that the invention may be practiced in other embodiments that depart from these specific details.
  • FIG. IA illustrates an ALD system 1 for depositing mixed rare earth based films on a substrate according to one embodiment of the invention.
  • the ALD system 1 includes a process chamber 10 having a substrate holder 20 configured to support a substrate 25, upon which the mixed rare earth based film is formed.
  • the process chamber 10 further contains an upper assembly 30 (e.g., a showerhead) coupled to a first process material supply system 40, a second process material supply system 42, a purge gas supply system 44, an oxygen-containing gas supply system 46, a nitrogen- containing gas supply system 48, and an aluminum-containing gas supply system 50.
  • an upper assembly 30 e.g., a showerhead
  • the ALD system 1 includes a substrate temperature control system 60 coupled to substrate holder 20 and configured to elevate and control the temperature of substrate 25. Furthermore, the ALD system 1 includes a controller 70 that can be coupled to process chamber 10, substrate holder 20, assembly 30 configured for introducing process gases into the process chamber 10, first process material supply system 40, second process material supply system 42, purge gas supply system 44, oxygen-containing gas supply system 46, nitrogen-containing gas supply system 48, aluminum-containing gas supply system 50, and substrate temperature control system 60.
  • controller 70 can be coupled to one or more additional controllers/computers (not shown), and controller 70 can obtain setup and/or configuration information from an additional controller/computer.
  • FIG. IA singular processing elements (10, 20, 30, 40, 42, 44, 46, 48, 50, and 60) are shown, but this is not required for the invention.
  • the ALD system 1 can include any number of processing elements having any number of controllers associated with them in addition to independent processing elements.
  • the controller 70 can be used to configure any number of processing elements (10, 20, 30, 40, 42, 44, 46, 48, 50, and 60), and the controller 70 can collect, provide, process, store, and display data from processing elements.
  • the controller 70 can comprise a number of applications for controlling one or more of the processing elements.
  • controller 70 can include a graphic user interface (GUI) component (not shown) that can provide easy to use interfaces that enable a user to monitor and/or control one or more processing elements.
  • GUI graphic user interface
  • the ALD system 1 may be configured to process 200 mm substrates, 300 mm substrates, or larger-sized substrates.
  • the deposition system may be configured to process substrates, wafers, or LCDs regardless of their size, as would be appreciated by those skilled in the art. Therefore, while aspects of the invention will be described in connection with the processing of a semiconductor substrate, the invention is not limited solely thereto. Alternately, a batch ALD system capable of processing multiple substrates simultaneously may be utilized for depositing the mixed rare earth based films described in the embodiments of the invention.
  • the first process material supply system 40 and the second process material supply system 42 are configured to alternately or simultaneously introduce a first and second rare earth precursor to process chamber 10, where the first and second rare earth precursors contains different rare earth metal elements.
  • the alternation of the introduction of the first and second rare earth precursors can be cyclical, or it may be acyclical with variable time periods between introduction of the first and second materials.
  • each of the first process material supply system 40 and the second process material supply system 42 may each be configured to alternately or simultaneously introduce a plurality of rare earth precursors to the process chamber 10, where the plurality of rare earth precursors contain different rare earth metal elements.
  • several methods may be utilized for introducing the rare earth precursors to the process chamber 10.
  • One method includes vaporizing rare earth precursors through the use of separate bubblers or direct liquid injection systems, or a combination thereof, and then mixing in the gas phase within or prior to introduction into the process chamber 10. By controlling the vaporization rate of each precursor separately, a desired rare earth metal element stoichiometry can be attained within the deposited film.
  • Another method of delivering each rare earth precursor includes separately controlling two or more different liquid sources, which are then mixed prior to entering a common vaporizer. This method may be utilized when the precursors are compatible in solution or in liquid form and they have similar vaporization characteristics. Other methods include the use of compatible mixed solid or liquid precursors within a bubbler.
  • Liquid source precursors may include neat liquid rare earth precursors, or solid or liquid rare earth precursors that are dissolved in a compatible solvent.
  • Possible compatible solvents include, but are not limited to, ionic liquids, hydrocarbons (aliphatic, olefins, and aromatic), amines, esters, glymes, crown ethers, ethers and polyethers. In some cases it may be possible to dissolve one or more compatible solid precursors in one or more compatible liquid precursors. It will be apparent to one skilled in the art that a plurality of different rare earth elements may be included in this scheme by including a plurality of rare earth precursors within the deposited film.
  • Embodiments of the inventions may utilize a wide variety of different rare earth precursors. For example, many rare earth precursors have the formula:
  • M is a rare earth metal element selected from the group of yttrium (Y), lutetium (Lu), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), and ytterbium (Yb).
  • L 1 , L 2 , L 3 are individual anionic ligands
  • D is a neutral donor ligand where x can be 0, 1, 2, or 3.
  • Each L 1 , L 3 , L 3 ligand may be individually selected from the groups of alkoxides, halides, aryloxides, amides, cyclopentadienyls, alkyls, silyls, amidinates, ⁇ -diketonates, ketoiminates, silanoates, and carboxylates.
  • D ligands may be selected from groups of ethers, furans, pyridines, pyroles, pyrolidines, amines, crown ethers, glymes, and nitriles.
  • L group alkoxides include tert-butoxide, iso-propoxide, ethoxide, 1- methoxy-2,2-dimethyl ⁇ 2-propionate (mmp), 1 -dimethylamino-2,2'-dimethyl-propionate, amyloxide, and neo-pentoxide.
  • halides include fluoride, chloride, iodide, and bromide.
  • aryloxides include phenoxide and 2,4,6-trimethylphenoxide.
  • amides include bis(trimethylsilyl)amide di-tert-butylamide, and 2,2,6,6- tetramethylpiperidide (TMPD).
  • cyclepentadienyls include cyclopentadienyl, 1- methylcyclopentadienyl, 1 ,2,3,4-tetramethylcyclopentadienyl, 1 -ethylcyclopentadienyl, pentamethylcyclopentadienyl, 1-iso-propylcyclo ⁇ entadienyl, 1-n-propylcyclo ⁇ entadienyI, and i-n-butylcyclopentadienyl.
  • alkyls include bis(trimethylsilyl)methyl, tris(trimethylsilyl)methyl, and trimethylsilylmethyl.
  • An example of a silyl is trimethylsilyl.
  • amidinates include N,N'-di ⁇ tert-butylacetamidinate, N,N'-di-iso- propylacetamidinate, N,N'-di-isopropyl-2-tert-butylamidinate, and N,N'-di-tert-butyl-2-tert- butylamidinate.
  • ⁇ -diketonates include 2,2,6,6-tetramethyl-3,5-he ⁇ tanedionate (THD), hexafluoro-2,4-pentandionate, and 6,6,7,7,8,8,8-heptafluoro-2,2 ⁇ dimethyl-3,5- octanedionate (FOD).
  • ketoiminate 2-iso-propylimino-4- ⁇ entanonate.
  • silanoates include tri-tert-butylsiloxide and triethylsiloxide.
  • An example of a carboxylate is 2-ethylhexanoate.
  • D ligands include tetrahydrofuran, diethylether, 1,2- dimethoxyethane, diglyme, triglyme, tetraglyme, 12-Crown-6, lO-Crown-4, pyridine, N- methylpyrolidine, triethylamine, trimethylamine, acetonitrile, and 2,2-dimethylpropionitrile.
  • rare earth precursors include: [0039] Y precursors: Y(N(SiMe 3 ) 2 ) 3 , Y(N(iPr) 2 ) 3 , Y(N(tBu)SiM:e 3 ) 3 , Y(TMPD) 3 , Cp 3 Y, (MeCp) 3 Y, ((nPr)Cp) 3 Y, ((11Bu)Cp) 3 Y, Y(OCMe 2 CH 2 NMe 2 ) 3 , Y(THD) 3 , Y[OOCCH(C 2 H 5 )C 4 H 9 J 3 , Y(C 1 ⁇ Hi 9 ⁇ 2) 3 CH 3 (OCH 2 CH 2 ) 3 OCH 3 , Y(CF 3 COCHCOCF 3 ) 3 , Y(OOCCioH 7 ) 3 ⁇ Y(OOC 10 H !9 ) 3 , and Y(O(iPr))
  • La precursors La(N(S iMe 3 ) 2 ) 3 , La(N(iPr) 2 ) 3 , La(N(tBu)SiMe 3 ) 3) La(TMPD) 3 ,
  • Ce precursors Ce(N(SiMe 3 ) 2 ) 3 , Ce(N(iPr) 2 ) 3 , Ce(N(tBu)SiMe 3 ) 3 , Ce(TMPD) 3 ,
  • Pr precursors Pr(N(SiMe 3 ) 2 ) 3 , ((1Pr)Cp) 3 Pr, Cp 3 Pr, Pr(THD) 3 , Pr(FOD) 3 ,
  • Nd precursors Nd(N(SiMe 3 ) 2 ) 3s Nd(N(iPr) 2 ) 3 , ((1Pr)Cp) 3 Nd, Cp 3 Nd,
  • Sm precursors Sm(N(SiMe 3 ) 2 ) 3 , ((1Pr)Cp) 3 Sm, Cp 3 Sm 5 Sm(THD) 3 ,
  • Eu precursors Eu(N(SiMe 3 ) 2 ) 3 , ((1Pr)Cp) 3 Eu, Cp 3 Eu, (Me 4 Cp) 3 Eu, Eu(THD) 3 ,
  • Gd precursors Gd(N(S !Me 3 ) 2 ) 3 , ((1Pr)Cp) 3 Gd 5 Cp 3 Gd, Gd(THD) 3 ,
  • Tb precursors Tb(N(SiMe 3 ) 2 ) 3 , ((1Pr)Cp) 3 Tb, Cp 3 Tb, Tb(THD) 3 ,
  • Dy precursors Dy(N(SiMe 3 ) 2 ) 3j ((1Pr)Cp) 3 Dy, Cp 3 Dy, Dy(THD) 3 ,
  • Ho precursors Ho(N(SiMe 3 ) 2 ) 3 , ((1Pr)Cp) 3 Ho, Cp 3 Ho, Ho(THD) 3 ,
  • Er precursors Er(N(SiMe 3 ) 2 ) 3s ((1Pr)Cp) 3 Er, ((nBu)Cp) 3 Er, Cp 3 Er 5 Er(THD) 3 ,
  • Tm precursors Tm(N( SiMe 3 ) 2 ) 3> ((APr)Cp) 3 Tm, Cp 3 Tm, Tm(THD) 3 , Tm[OOCCH(C 2 H 5 )C 4 Hg] 3 , Tm(0(iPr)) 3 , and Tm(acac) 3 .
  • Yb precursors Yb(N(SiMe 3 ) 2 ) 3 , Yb(N(iPr) 2 ) 3 , ((1Pr)Cp) 3 Yb, Cp 3 Yb, Yb(THD) 3 , Yb[OOCCH(C 2 H 5 )C 4 Hg] 3 , Yb(O(iPr)) 3s Yb(acac) 3 , (C 5 Me s ) 2 Yb, Yb(hfac) 3 , and Yb(FOD) 3 .
  • Lu precursors Lu(N(S iMe 3 ) 2 ) 3 , ((1Pr)Cp) 3 Lu, Cp 3 Lu, Lu(THD) 3 , Lu[OOCCH(C 2 H 5 )C 4 Hg] 3 , Lu(0(iPr)) 3 , and Lu(acac) 3 .
  • Si silicon; Me: methyl; Et: ethyl; iPr: isopropyl; nPr: n- propyl; Bu: butyl; nBu: n-butyl; sBu: sec-butyl; iBu: iso-butyl; tBu: tert-butyl; Cp: cyclopentadienyl; THD: 2,2, ⁇ ,6-tetramethyl-3,5-he ⁇ tanedionate; TMPD: 2,2,6,6- tetramethylpiperidide; acac: acetylacetonate; hfac: hexafluoroacetylaceto ⁇ ate; and FOD: 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionate.
  • the oxygen-containing gas supply system 46 is configured to introduce an oxygen-containing gas to the process chamber 10.
  • the oxygen- containing gas can include O 2 , H 2 O 5 or H 2 O 2 , or a combination thereof, and optionally an inert gas such as Ar.
  • the nitrogen-containing gas supply system 48 is configured to introduce a nitrogen-containing gas to the process chamber 10.
  • the nitrogen-containing gas can include NH 3 , N 2 H 4 , or a combination thereof, and optionally an inert gas such as Ar.
  • the oxygen-containing gas or the nitrogen- containing gas can include NO, NO 2 , or N 2 O, or a combination thereof, and optionally an inert gas such as Ar.
  • Embodiments of the invention may utilize a wide variety of aluminum precursors for incorporating aluminum into the mixed rare earth based films.
  • aluminum precursors for incorporating aluminum into the mixed rare earth based films.
  • many aluminum precursors have the formula:
  • L 1 , L 2 , L 3 are individual anionic ligands, and D is a neutral donor ligand where x can be 0, 1, or 2.
  • Each L 1 , L 2 , L 3 ligand may be individually selected from the groups of alkoxides, halides, aryloxides, amides, cyclopentadienyls, alkyls, silyls, amidinates, ⁇ - diketonates, ketoiminates, silanoates, and carboxylates.
  • D ligands may be selected from groups of ethers, furans, pyridines, pyroles, pyrolidines, amines, crown ethers, glymes, and nitrites.
  • the purge gas supply system 44 is configured to introduce a purge gas to process chamber 10.
  • the introduction of purge gas may occur between introduction of pulses of rare earth precursors and an oxygen-containing gas, a nitrogen-containing gas, or an aluminum precursor to the process chamber 10.
  • the purge gas can comprise an inert gas, such as a noble gas (i.e., He, Ne, Ar, Kr, Xe), nitrogen (N 2 ), or hydrogen (H 2 ).
  • ALD system 1 includes substrate temperature control system 60 coupled to the substrate holder 20 and configured to elevate and control the temperature of substrate 25.
  • Substrate temperature control system 60 comprises temperature control elements, such as a cooling system including a re-circulating coolant flow that receives heat from substrate holder 20 and transfers heat to a heat exchanger system (not shown), or when heating, transfers heat from the heat exchanger system.
  • the temperature control elements can include heating/cooling elements, such as resistive heating elements, or thermoelectric heaters/coolers, which can be included in the substrate holder 20, as well as the chamber wall of the processing chamber 10 and any other component within the ALD system 1,
  • the substrate temperature control system 60 can, for example, be configured to elevate and control the substrate temperature from room temperature to approximately 35O 0 C to 550 0 C.
  • the substrate temperature can, for example, range from approximately 15O 0 C to 350 0 C. It is to be understood, however, that the temperature of the substrate is selected based on the desired temperature for causing deposition of a particular mixed rare earth based material on the surface of a given substrate.
  • substrate holder 20 can include a mechanical clamping system, or an electrical clamping system, such as an electrostatic clamping system, to affix substrate 25 to an upper surface of substrate holder 20.
  • substrate holder 20 can further include a substrate backside gas delivery system configured to introduce gas to the back-side of substrate 25 in order to improve the gas-gap thermal conductance between substrate 25 and substrate holder 20.
  • a substrate backside gas delivery system configured to introduce gas to the back-side of substrate 25 in order to improve the gas-gap thermal conductance between substrate 25 and substrate holder 20.
  • the substrate backside gas system can comprise a two-zone gas distribution system, wherein the helium gas gap pressure can be independently varied between the center and the edge of substrate 25.
  • the process chamber 10 is further coupled to a pressure control system 32, including a vacuum pumping system 34 and a valve 36, through a duct 38, wherein the pressure control system 32 is configured to controllably evacuate the process chamber 10 to a pressure suitable for forming the thin film on substrate 25, and suitable for use of the first and second process materials.
  • the vacuum pumping system 34 can include a turbo-molecular vacuum pump (TMP) or a cryogenic pump capable of a pumping speed up to about 5000 liters per second (and greater) and valve 36 can include a gate valve for throttling the chamber pressure.
  • a device for monitoring chamber pressure (not shown) can be coupled to the processing chamber 10.
  • the pressure measuring device can be, for example, a Type 628B Baratron absolute capacitance manometer commercially available from MKS Instruments, Inc. (Andover, MA).
  • the pressure control system 32 can, for example, be configured to control the process chamber pressure between about 0.1 Torr and about 100 Torr during deposition of the mixed rare earth based materials.
  • the first material supply system 40, the second material supply system 42, the purge gas supply system 44, the oxygen-containing gas supply system 46, the nitrogen- containing gas supply system 48, and the aluminum-containing gas supply system 50 can include one or more pressure control devices, one or more flow control devices, one or more filters, one or more valves, and/or one or more flow sensors.
  • the flow control devices can include pneumatic driven valves, electro -mechanical (solenoidal) valves, and/or high-rate pulsed gas injection valves.
  • gases maybe sequentially and alternately pulsed into the process chamber 10, where the length of each gas pulse can, for example, be between about 0.1 sec and about 100 sec. Alternately, the length of each gas pulse can be between about 1 sec and about 10 sec.
  • Exemplary gas pulse lengths for rare earth precursors can be between 0.3 and 3 sec, for example 1 sec.
  • Exemplary gas pulse lengths for aluminum precursors can be between 0.1 and 3 sec, for example 0.3 sec.
  • Exemplary gas pulse lengths for oxygen- and nitrogen-containing gases can be between 0.3 and 3 sec, for example 1 sec.
  • controller 70 can comprise a microprocessor, memory, and a digital 170 port capable of generating control voltages sufficient to communicate and activate inputs to the ALD system 1 as well as monitor outputs from the ALD system 1.
  • the controller 70 may be coupled to and may exchange information with the process chamber 10, substrate holder 20, upper assembly 30, first process material supply system 40, second process material supply system 42, purge gas supply system 44, oxygen- containing gas supply system 46, nitrogen-containing gas supply system 48, aluminum- containing gas supply system 50, substrate temperature control system 60, substrate temperature controller 60, and pressure control system 32.
  • a program stored in the memory may be utilized to activate the inputs to the aforementioned components of the deposition system 1 according to a process recipe in order to perform a deposition process
  • One example of the controller 70 is a DELL PRECISION WORKSTATION 610TM, available from Dell Corporation, Austin, Texas.
  • the controller 70 may be implemented as a general purpose computer system that performs a portion or all of the microprocessor based processing steps of the invention in response to a processor executing one or more sequences of one or more instructions contained in a memory, Such instructions may be read into the controller memory from another computer readable medium, such as a hard disk or a removable media drive.
  • processors in a multi-processing arrangement may also be employed as the controller microprocessor to execute the sequences of instructions contained in main memory.
  • hard-wired circuitry may be used in place of or in combination with software instructions. Thus, embodiments are not limited to any specific combination of hardware circuitry and software.
  • the controller 70 includes at least one computer readable medium or memory, such as the controller memory, for holding instructions programmed according to the teachings of the invention and for containing data structures, tables, records, or other data that may be necessary to implement the present invention.
  • Examples of computer readable media are compact discs, hard disks, floppy disks, tape, magneto-optical disks, PROMs (EPROM, EEPROM, flash EPROM), DRAM, SRAM, SDRAM, or any other magnetic medium, compact discs (e.g., CD-ROM), or any other optical medium, punch cards, paper tape, or other physical medium with patterns of holes, a carrier wave (described below), or any other medium from which a computer can read.
  • ⁇ software for controlling the controller 70, for driving a device or devices for implementing the invention, and/or for enabling the controller to interact with a human user.
  • Such software may include, but is not limited to, device drivers, operating systems, development tools, and applications software.
  • Such computer readable media further includes the computer program product of the present invention for performing all or a portion (if processing is distributed) of the processing performed in implementing the invention.
  • the computer code devices may be any interpretable or executable code mechanism, including but not limited to scripts, interpretable programs, dynamic link libraries (DLLs), Java classes, and complete executable programs. Moreover, parts of the processing of the present invention maybe distributed for better performance, reliability, and/or cost.
  • Non-volatile media includes, for example, optical, magnetic disks, and magneto-optical disks, such as the hard disk or the removable media drive.
  • Volatile media includes dynamic memory, such as the main memory.
  • various forms of computer readable media may be involved in carrying out one or more sequences of one or more instructions to processor of controller for execution.
  • the instructions may initially be carried on a magnetic disk of a remote computer.
  • the remote computer can load the instructions for implementing all or a portion of the present invention remotely into a dynamic memory and send the instructions over a network to the controller 70.
  • the controller 70 may be locally located relative to the ALD system 1 , or it may be remotely located relative to the ALD system 1.
  • the controller 70 may exchange data with the ALD system 1 using at least one of a direct connection, an intranet, the Internet and a wireless connection.
  • the controller 70 may be coupled to an intranet at, for example, a customer site (i.e., a device maker, etc.), or it may be coupled to an intranet at, for example, a vendor site (i.e., an equipment manufacturer). Additionally, for example, the controller 70 may be coupled to the Internet.
  • controller 70 may access, for example, the controller 70 to exchange data via at least one of a direct connection, an intranet, and the Internet.
  • controller 70 may exchange data with the deposition system 1 via a wireless connection.
  • FIG. IB illustrates a PEALD system 100 for depositing a mixed rare earth based film on a substrate according to an embodiment of the invention.
  • the PEALD system 100 is similar to the ALD system 1 described in FIG. IA, but further includes a plasma generation system configured to generate a plasma during at least a portion of the gas exposures in the process chamber 10. This allows formation of ozone and plasma excited oxygen from an oxygen-containing gas containing O 2 , H 2 O, H 2 O 2 , or a combination thereof.
  • plasma excited nitrogen may be formed from a nitrogen gas containing N 2 , NH 3 , or N 2 H 4 , or a combination thereof, in the process chamber.
  • plasma excited oxygen and nitrogen may be formed from a process gas containing NO, NO 2 , and N 2 O, or a combination thereof.
  • the plasma generation system includes a first power source 52 coupled to the process chamber 10, and configured to couple power to gases introduced into the process chamber 10.
  • the first power source 52 may be a variable power source and may include a radio frequency (RF) generator and an impedance match network, and may further include an electrode through which RF power is coupled to the plasma in process chamber 10.
  • the electrode can be formed in the upper assembly 31, and it can be configured to oppose the substrate holder 20.
  • the impedance match network can be configured to optimize the transfer of RF power from the RF generator to the plasma by matching the output impedance of the match network with the input impedance of the process chamber, including the electrode, and plasma. For instance, the impedance match network serves to improve the transfer of RF power to plasma in process chamber 10 by reducing the reflected power.
  • Match network topologies e.g. L- type, ⁇ -type, T-type, etc.
  • automatic control methods are well known to those skilled in the art.
  • the first power source 52 may include a RF generator and an impedance match network, and may further include an antenna, such as an inductive coil, through which RF power is coupled to plasma in process chamber 10.
  • the antenna can, for example, include a helical or solenoidal coil, such as in an inductively coupled plasma source or helicon source, or it can, for example, include a flat coil as in a transformer coupled plasma source.
  • the first power source 52 may include a microwave frequency generator, and may further include a microwave antenna and microwave window through which microwave power is coupled to plasma in process chamber 10.
  • the coupling of microwave power can be accomplished using electron cyclotron resonance (ECR) technology, or it may be employed using surface wave plasma technology, such as a slotted plane antenna (SPA), as described in US Patent No. 5,024,716.
  • ECR electron cyclotron resonance
  • SPA slotted plane antenna
  • the PEALD system 100 includes a substrate bias generation system configured to generate or assist in generating a plasma (through substrate holder biasing) during at least a portion of the alternating introduction of the gases to the process chamber 10.
  • the substrate bias system can include a substrate power source 54 coupled to the process chamber 10, and configured to couple power to the substrate 25.
  • the substrate power source 54 may include a RF generator and an impedance match network, and may further include an electrode through which RF power is coupled to substrate 25.
  • the electrode can be formed in substrate holder 20.
  • substrate holder 20 can be electrically biased at a RF voltage via the transmission of RF power from a RF generator (not shown) through an impedance match network (not shown) to substrate holder 20.
  • a typical frequency for the RF bias can range from about 0.1 MHz to about 100 MHz, and can be 13.56 MHz.
  • RF bias systems for plasma processing are well known to those skilled in the art.
  • RF power is applied to the substrate holder electrode at multiple frequencies.
  • the plasma generation system and the substrate bias system are illustrated in FIG. IB as separate entities, they may indeed comprise one or more power sources coupled to substrate holder 20.
  • the PEALD system 100 includes a remote plasma system 56 for providing and remotely plasma exciting an oxygen-containing gas, a nitrogen-containing gas, or a combination thereof, prior to flowing the plasma excited gas into the process chamber 10 where it is exposed to the substrate 25.
  • the remote plasma system 56 can, for example, contain a microwave frequency generator.
  • the process chamber pressure can be between about 0.1 Torr and about 10 Torr, or between about 0.2 Torr and about 3 Torr.
  • FIGS. 2A - 2F schematically illustrate pulse sequences for forming mixed rare earth based films according to embodiments of the invention.
  • sequential and alternating pulse sequences are used to deposit the different components (i.e., rare earth metal elements, aluminum, oxygen, and nitrogen) of the mixed rare earth based films.
  • ALD and PEALD processes typically deposit less than a monolayer of material per gas pulse, it is possible to form a homogenous material using separate deposition sequences of the different components of the film.
  • mixed rare earth materials may be formed that include mixed rare earth oxide films, mixed rare earth nitride films, mixed rare earth oxynitride films, mixed rare earth aluminate films, mixed rare earth aluminum nitride films, and mixed rare earth aluminum oxynitride films.
  • FIG. 2A depicts a pulse sequence 200 for depositing a first rare earth element from a first rare earth precursor in step 202.
  • FIG. 2B depicts a pulse sequence 210 for depositing a second rare earth element from a second rare earth precursor in step 212.
  • FIG. 2C depicts a pulse sequence 220 for simultaneously depositing a plurality of different rare earth elements from a plurality of rare earth precursors in step 222.
  • FIG. 2D depicts a pulse sequence 230 for incorporating oxygen into a mixed rare earth based film from exposure to an oxygen-containing gas in step 232.
  • FIG. 2E depicts a pulse sequence 240 for incorporating nitrogen into a mixed rare earth based film from exposure to a nitrogen- containing gas in step 242.
  • FIG. 2F depicts a pulse sequence 250 for depositing aluminum from an aluminum precursor in step 252.
  • each of the pulse sequences 200, 210, 220, 230, 240, and 250 may include a respective purge or evacuation step 204, 214, 224, 234, 244, 254 to remove unreacted gas or byproducts from the process chamber.
  • one or more of the purge or evacuation steps 204, 214, 224, 234, 244, 254 may be omitted.
  • different combinations of the pulse sequences depicted in FIGS. 2A - 2F may be utilized for depositing different mixed rare earth based materials.
  • Mixed rare earth based materials containing two different rare earth metal elements that may be deposited by the teachings of embodiments of the invention.
  • a wide variety of other mixed rare earth based materials not shown below may be deposited. Therefore, embodiments of the invention are not limited to the materials listed below.
  • other mixed rare earth based materials may contain more than two rare earth elements, for example three, four, or more.
  • Mixed Rare Earth Oxides La x Lu y O m , Y x Lu y 0 m , Y x La y O m , Nd x La y O m , and
  • FIGS. 3A - 3D are process flow diagrams for forming mixed rare earth oxide films according embodiments of the invention.
  • the process flows of FIGS. 3 A - 3D may be performed by the ALD/PEALD systems 1/101 of FIGS. I 5 2, or any other suitable ALD/PEALD systems configured to perform an ALD/PEALD process.
  • the process 300 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 302.
  • the substrate is sequentially exposed to a gas pulse containing a first rare earth precursor and a gas pulse of an oxygen-containing gas.
  • the substrate is sequentially exposed to a gas pulse of a second rare earth precursor and a gas pulse of an oxygen-containing gas.
  • the oxygen- containing gas can include O 2 , H 2 O, H 2 O 2 , ozone, or plasma excited oxygen, or a combination thereof, and optionally an inert gas such as Ar.
  • the first rare earth precursor reacts with hydroxyl groups on the surface of the heated substrate to form a chemisorbed layer less than a monolayer thick containing the first rare earth metal element.
  • the chemisorbed layer is less than a monolayer thick due to the large size of the precursor compared to the size of the first rare earth metal element.
  • oxygen from the gas pulse of the oxygen-containing gas reacts with the chemisorbed surface layer and regenerates a hydroxylated surface.
  • the process chamber may be purged or evacuated to removing any unreacted first or second rare earth precursor, byproducts, and oxygen- containing gas from the process chamber between the sequential and alternating gas pulses.
  • the first rare earth (REl) precursor and the second rare earth (RE2) precursor contain different rare earth metal elements for forming mixed rare earth oxide films with a general chemical formula REl x RE2 y 0 m , where x, y, and m are non-zero numbers.
  • the sequential exposure steps 304 and 306 may be repeated a predetermined number of times, as shown by the process flow arrow 308, until a mixed rare earth oxide film with a desired thickness has been formed.
  • the desired film thickness can depend on the type of semiconductor device or device region being formed. For example, the film thickness can be between about 5 angstroms and about 200 angstroms, or between about 5 angstroms and about 40 angstroms.
  • the process flow 300 includes a deposition cycle containing sequential and alternating exposures of a pulse of a first rare earth precursor, a pulse of an oxygen-containing gas, a pulse of a second rare earth precursor, and a pulse of an oxygen-containing gas.
  • the order of the sequential and alternating exposure steps 304, 306 may be reversed, i.e., step 306 performed before step 304, to effect film growth and film composition.
  • each of the sequential exposure steps 304 and 306 may be independently repeated a predetermined number of times, in one example, if step 304 is denoted by pulse sequence A and step 306 is denoted by a pulse sequence B, a deposition cycle can include AB where AB may be repeated a predetermined number of times (i.e., ABABAB etc.) until the desired film is formed,
  • ABBABB ABBABB
  • AABAAB ABBB
  • AAAB AABB
  • AAABB AAABB
  • embodiments of the invention are not limited to these deposition cycles, as any combination of A and B may be utilized.
  • additional pulse sequences containing additional rare earth precursors containing different rare earth elements may be added to the process flow depicted in FIG. 3A to form mixed rare earth oxide films containing three or more different rare earth metal elements.
  • additional rare earth elements may be incorporated into the films by adding pulse sequences containing a gas pulse of a rare earth precursor and gas pulse of an oxygen-containing gas for each additional rare earth metal element to be incorporated into the film.
  • a pulse sequence C containing a gas pulse of a third rare earth precursor and a gas pulse of an oxygen-containing gas may be added.
  • one deposition cycle can, for example, include ABC, ABBC, ABCC, etc.
  • embodiments of the invention are not limited to these deposition cycles, as other combinations of A, B, and C may be utilized.
  • FIG. 3B is a process flow diagram for forming a mixed rare earth oxide film according to another embodiment of the invention.
  • the process flow 320 is similar to the process flow 310 of FIG. 3A, but process flow 320 further includes steps of purging or evacuating the process chamber after each gas pulse.
  • the purging or evacuating steps can aid in removing any unreacted rare earth precursor, byproducts, and oxygen-containing gas from the process chamber between the sequential and alternating rare earth precursor and oxygen- containing gas pulses.
  • purging steps may further include evacuating the process chamber during the purging.
  • the process 320 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 322.
  • a substrate such as a semiconductor substrate
  • the substrate is exposed to a gas pulse of a first rare earth precursor substrate, and in step 326, the process chamber is purged or evacuated to remove unreacted first rare earth precursor and any byproducts from the process chamber.
  • the substrate is exposed to a pulse of an oxygen-containing gas, and in step 330, the process chamber is purged or evacuated to remove any unreacted oxygen -containing gas or byproducts from the process chamber.
  • step 332 the substrate is exposed to a gas pulse containing a second rare earth precursor, and in step 334, the process chamber is purged or evacuated to remove any unreacted second rare earth precursor and any byproducts from the process chamber.
  • step 336 the substrate is exposed to a pulse of an oxygen-containing gas, and in step 338, the process chamber is purged or evacuated to remove any unreacted oxygen-containing gas or byproducts from the process chamber.
  • the exposure steps 324 - 330 of process flow 320 may be repeated a predetermined number of times, as shown by the process flow arrow 340, and exposure steps 332 - 338 may be repeated a predetermined number of times, as shown by the process flow arrow 342.
  • the combination of exposure steps 324 - 330 and steps 332 -338 may be repeated a predetermined number of times, as shown by the process flow arrow 344.
  • FIG. 3C is a process flow diagram for forming a mixed rare earth oxide film according to yet another embodiment of the invention.
  • the process 350 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 352.
  • the substrate is exposed to a gas pulse containing a plurality of, i.e., at least two, rare earth precursors each having a different rare earth metal element.
  • the gas pulse contains a plurality of different rare earth metal elements to be deposited on the substrate.
  • the relative concentration of each rare earth precursor in the gas pulse may be independently controlled to tailor the composition of the resulting mixed rare earth oxide film.
  • the substrate is exposed to a pulse of an oxygen-containing gas.
  • the sequential exposure steps 354 and 356 may be repeated a predetermined number of times as depicted by the process flow arrow 358.
  • FIG. 3D is a process flow diagram for forming a mixed rare earth oxide film according to still another embodiment of the invention.
  • the process flow 360 is similar to the process flow 350 of FIG. 3C but it also includes steps of purging or evacuating the process chamber after each, gas pulse.
  • the process 360 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 362.
  • step 364 the substrate is exposed to a gas pulse containing a plurality of rare earth precursors each having a different rare earth metal element, and in step 366, the process chamber is purged or evacuated to remove unreacted rare earth precursor and any byproducts from the process chamber.
  • step 368 the substrate is exposed to a pulse of an oxygen- containing gas, and in step 370, the process chamber is purged or evacuated to remove any excess oxygen-containing gas or byproducts from the process chamber.
  • the sequential exposure steps 364 - 370 may be repeated a predetermined number of times, as shown by the process flow arrow 372. MIXED RARE EARTH NITRIDE FILMS
  • FIGS. 4A - 4B are process flow diagrams for forming mixed rare earth nitride films according embodiments of the invention.
  • the process flows of FIG. 4A - 4D may be performed by the ALD/PEALD systems 1/101 of FIGS. 1, 2, or any other suitable ALD/PEALD systems configured to perform an ALD/PEALD process.
  • the process 400 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 402.
  • the substrate is sequentially exposed to a gas pulse containing a first rare earth precursor and a gas pulse of a nitrogen-containing gas.
  • the substrate is sequentially exposed to a gas pulse of a second rare earth precursor and a gas pulse of a nitrogen- containing gas.
  • the nitrogen-containing gas can contain NH 3 , N 2 H 4 , plasma excited nitrogen, or a combination thereof, and optionally an inert gas such as Ar.
  • the first rare earth (REl) precursor and the second rare earth (RE2) precursor contain different rare earth metal elements for forming mixed rare earth nitride films with a general chemical formula REl x RE2 y N n , where x, y, and 11 are non-zero numbers.
  • the sequential exposure steps 404 and 406 may be repeated a predetermined number of times, as shown by the process flow arrow 408, until a mixed rare earth nitride film with a desired thickness has been formed.
  • the desired film thickness can depend on the type of semiconductor device or device region being formed. For example, the film thickness can be between about 5 angstroms and about 200 angstroms, or between about 5 angstroms and about 40 angstroms.
  • the process flow 400 includes a deposition cycle containing sequential and alternating exposures of a pulse of a first rare earth precursor, a pulse of a nitrogen-containing gas, a pulse of a second rare earth precursor, and a pulse of a nitrogen-containing gas.
  • the process flow 400 may contain steps 404, 406, 408 in any order.
  • the order of the sequential and alternating exposure steps 404 and 406 of the deposition cycle be reversed, i.e., step 406 performed before steps 404 to effect film growth and film composition.
  • each of the sequential exposure steps 404 and 406 may be independently repeated a predetermined number of times, hi one example, if step 404 is denoted by pulse sequence A and step 406 is denoted by a pulse sequence B, a deposition cycle can include AB where AB may be repeated a predetermined number of times (i.e., ABABAB etc.) until the desired film is formed.
  • ABBABB ABBABB
  • AABAAB ABBB 5 AAAB 5 AABB, AAABB, etc.
  • embodiments of the invention are not limited to these deposition cycles, as other combinations of A and B may be utilized. Using these different deposition cycles, it is possible to deposit rare earth nitride films containing different amounts and different depth profiles of the first and second rare earth elements in the resulting mixed rare earth nitride films.
  • additional pulse sequences containing additional rare earth precursors containing different rare earth elements may be added to the process flow depicted in FIG. 4 A to form mixed rare earth nitride films contain ing three or more different rare earth metal elements.
  • additional rare earth elements may be incorporated into the films by adding pulse sequences containing sequential exposures of a gas pulse of a rare earth precursor and a gas pulse of a nitrogen- containing gas for each additional rare earth metal element to be incorporated into the film.
  • a pulse sequence C containing a gas pulse of a third rare earth precursor and a gas pulse of a nitrogen-containing gas may be added.
  • one deposition cycle can, for example, include ABC, ABBC, ABCC, etc.
  • the process flow 400 may further include steps of purging or evacuating the process chamber after each, gas pulse, analogous to the process flow 320 of FIG. 3B.
  • the purging or evacuating steps can aid in removing any unreacted rare earth precursor, byproducts, and nitrogen-containing gas from the process chamber between the alternating rare earth precursor and nitrogen-containing gas pulses.
  • FIG. 4B is a process flow diagram for forming a mixed rare earth nitride film according to yet another embodiment of the invention.
  • the process 410 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 412.
  • step 414 the substrate is exposed to a gas pulse containing a plurality of rare earth precursors each having a different rare earth metal element.
  • the gas pulse contains a plurality of different rare earth metal elements to be deposited on the substrate.
  • the relative concentration of each rare earth precursor in the gas pulse may be independently controlled to tailor the composition of the resulting mixed rare earth nitride film.
  • step 416 the substrate is exposed to a pulse of a nitrogen-containing gas.
  • the sequential exposure steps 414 and 416 may be repeated a predetermined number of times as depicted by the process flow arrow 418.
  • the process flow 410 may further include steps of purging or evacuating the process chamber after each gas pulse, analogous to the process flow 360 of FIG. 3D.
  • the purging or evacuating steps can aid in removing any unreacted rare earth precursor, byproducts, and nitrogen-containing gas from the process chamber between the alternating gas pulses.
  • FIGS. 5A - 5B are process flow diagrams for forming mixed rare earth oxynitride films according embodiments of the invention.
  • the process flows of FIG. 5 A - 5D may be performed by the ALD/PEALD systems 1/101 of FIGS. I 5 2, or any other suitable ALD/PEALD systems configured to perform an ALD/PEALD process.
  • the process 500 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 502.
  • the substrate is sequentially exposed to a gas pulse containing a first rare earth precursor and a gas pulse of an oxygen-containing gas, a nitrogen-containing gas, or an oxygen and nitrogen-containing gas.
  • the substrate is sequentially exposed to a gas pulse of a second rare earth precursor and a gas pulse of an oxygen-containing gas, a nitrogen- containing gas, or an oxygen and nitrogen-containing gas.
  • the oxygen-containing gas can include O 2 , H 2 O, H 2 O 2 , NO, NO 2 , N 2 O, ozone, or plasma excited oxygen, or a combination thereof, and optionally an inert gas such as Ar.
  • the nitrogen-containing gas can contain NH 3 , N 2 H 4 , NO, NO 2 , N 2 O, plasma excited nitrogen, or a combination thereof, and optionally an inert gas such as Ar.
  • the combination of steps 504 and 506 should include at least one gas pulse containing oxygen and at least one gas pulse containing nitrogen, Of course, gases that include NO, NO 2 , or N 2 O, contain both oxygen and nitrogen.
  • the first rare earth (REl) precursor and the second rare earth are both oxygen and nitrogen.
  • RE2 precursors contain different rare earth metal elements for forming mixed rare earth oxynitride films with a general chemical formula REl x RE2 y O m N n , where x, y, m, and n are non-zero numbers.
  • the sequential exposure steps 504 and 506 may be repeated a predetermined number of times, as shown by the process flow arrow 508, until a mixed rare earth oxynitride film with a desired thickness has been formed.
  • the desired film thickness can depend on the type of semiconductor device or device region being formed. For example, the film thickness can be between about 5 angstroms and about 200 angstroms, or between about 5 angstroms and about 40 angstroms.
  • the process flow 500 includes a deposition cycle containing sequential and alternating exposures of a pulse of a first rare earth precursor, a pulse of an oxygen-, nitrogen- or oxygen and nitro gen-containing gas, a pulse of a second rare earth precursor, and a pulse of an oxygen-, nitrogen- or oxygen and nitrogen-containing gas.
  • the order of the sequential and alternating exposure steps 504 and 506 may be reversed, i.e., step 506 performed before step 504, to effect film growth and film composition
  • each of the sequential exposure steps 504 and 506 may be independently repeated a predetermined number of times.
  • a deposition cycle can include AB where AB may be repeated a predetermined number of times (i.e., ABABAB etc.) until the desired film is formed.
  • ABBABB a predetermined number of times
  • ABBB a predetermined number of times
  • ABBB a predetermined number of times
  • ABBB a predetermined number of times
  • ABBB a predetermined number of times
  • ABBB a predetermined number of times
  • additional pulse sequences containing additional rare earth precursors containing different rare earth metal elements may be added to the process flow depicted in FIG. 5A to form mixed rare earth oxynitride films containing three or more different rare earth metal elements.
  • additional rare earth elements may be incorporated into the films by adding pulse sequences containing a gas pulse of a rare earth metal precursor and a gas pulse of an oxygen-, nitrogen- or oxygen and nitrogen-containing gas for each additional rare earth metal element to be incorporated into the film.
  • a pulse sequence C containing a gas pulse of a third rare earth precursor and a gas pulse of an oxygen-, nitrogen- or oxygen and nitrogen-containing gas may be added.
  • one deposition cycle can, for example, include ABC, ABBC, ABCC 5 etc.
  • embodiments of the invention are not limited to these deposition cycles, as other combinations of A, B, and C maybe utilized.
  • the process flow 500 may further include steps of purging or evacuating the process chamber after each gas pulse, analogous to the process flow 320 of FIG. 3B.
  • the purging or evacuating steps can aid in removing any unreacted rare earth precursor, byproducts, oxygen-containing gas, and nitrogen-containing gas from the process chamber between the alternating rare earth precursor, oxygen, and nitrogen-containing gas pulses.
  • FIG. 5B is a process flow diagram for forming a mixed rare earth oxymtride film according to yet another embodiment of the invention.
  • the process 510 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 512.
  • step 514 the substrate is exposed to a gas pulse containing a plurality of rare earth precursors each having a different rare earth metal element.
  • the gas pulse contains a plurality of, i.e., at least two, different rare earth metal elements to be deposited on the substrate.
  • the relative concentration of each rare earth precursor may be independently controlled to tailor the composition of the resulting mixed rare earth nitride film.
  • step 516 the substrate is exposed to a pulse of an oxygen-containing gas, a nitrogen-containing gas, or an oxygen and nitrogen-containing gas.
  • the sequential exposure steps 514 and 516 may be repeated a predetermined number of times as depicted by the process flow arrow 518.
  • the combination of steps 514 and 516 should include at least one gas pulse containing oxygen and at least one gas pulse containing nitrogen.
  • the process flow 510 may further include steps of purging or evacuating the process chamber after each gas pulse, analogous to the process flow 360 of FIG. 3D.
  • the purging or evacuating steps can aid in removing any unreacted rare earth precursor, byproducts, oxygen-containing gas, or nitrogen- containing gas from the process chamber between the alternating gas pulses.
  • FIGS. 6A - 6B are process flow diagrams for forming mixed rare earth aluminate films according embodiments of the invention.
  • the process flows of FIG. 6A - 6D may be performed by the ALD/PEALD systems 1/101 of FIGS. 1, 2, or any other suitable ALD/PEALD systems configured to perform an ALD/PEALD process.
  • the process 600 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 602.
  • the substrate is sequentially exposed to a gas pulse of a first rare earth precursor and a gas pulse of an oxygen-containing gas.
  • the substrate is sequentially exposed to a gas pulse of a second rare earth precursor and a gas pulse of an oxygen-containing gas.
  • the substrate is sequentially exposed to gas pulse of an aluminum precursor and a gasinstalle of an oxygen-containing gas.
  • the oxygen-containing gas can include O 2 , H2O, H 2 O 2 , ozone, or plasma excited oxygen, or a combination thereof, and optionally an inert gas such as Ar.
  • the first rare earth (REl) precursor and second rare earth (RE2) precursors contain different rare earth metal elements for forming mixed rare earth aluminate films with a general chemical formula REl x RE2 y Al a 0 m , where x, y, a, and m are non-zero numbers.
  • the sequential exposure steps 604, 606, 608 may be repeated a predetermined number of times, as shown, by the process flow arrow 614, until a mixed rare earth aluminate film with a desired thickness has been formed.
  • the desired film thickness can depend on the type of semiconductor device or device region being formed. For example, the film thickness can be between about 5 angstroms and about 200 angstroms, or between about 5 angstroms and about 40 angstroms.
  • the process flow includes a deposition cycle containing sequential and alternating exposures of a pulse of a first rare earth precursor, a pulse of an oxygen-containing gas, a pulse of a second rare earth precursor, a pulse of an oxygen-containing gas, a pulse of an aluminum precursor, and a pulse of an oxygen-containing gas.
  • the order of the sequential and alternating exposure steps 604, 606, 608 of the deposition cycle can be changed to effect film growth and film composition.
  • each of the sequential exposure steps 604, 606, 608 may be independently repeated a predetermined number of times.
  • a deposition cycle can include ABX where ABX maybe repeated a predetermined number of times (i.e., ABXABXABX etc.) until the desired film is formed.
  • ABXABXABX a predetermined number of times
  • a wide variety of other deposition cycles are possible including, for example, AABXAABX, ABBXABBX, ABXXABX 3 AABXABBX, etc.
  • embodiments of the invention are not limited to these deposition cycles, as other combinations of A, B, and X may be utilized. Using these different deposition cycles, it is possible to deposit rare earth alurninate films containing different amounts and different depth profiles of the first and second rare earth elements and aluminum in the resulting mixed rare earth alurm ' nate film.
  • additional pulse sequences containing additional rare earth precursors containing different rare earth metal elements may be added to the process flow depicted in FIG. 6A to form mixed rare earth oxide films containing a three or more different rare earth metal elements.
  • additional rare earth elements may be incorporated into the films by adding pulse sequences containing a gas pulse of a rare earth precursor and gas pulse of an oxygen-containing gas for each additional rare earth metal element to be incorporated into the film.
  • a pulse sequence C containing a gas pulse of a third rare earth precursor and a gas pulse of an oxygen-containing gas may be added.
  • one deposition cycle can, for example, include ABCX, ABBCX, ABCCX, etc.
  • embodiments of the invention are not limited to these deposition cycles, as other combinations of A, B, C, and X may be utilized.
  • the process flow 600 may further include steps of purging or evacuating the process chamber after each gas pulse.
  • the purging or evacuating steps can aid in removing any unreacted rare earth precursor, byproducts, aluminum precursor, and oxygen-containing gas from the process chamber between the alternating pulses of rare earth precursor, oxygen-containing gas, and aluminum- containing gas.
  • the exposure steps 604 and 606 may be repeated in sequence a predetermined number of times, as shown by the process flow arrow 612, and exposure steps 606 and 608 may be repeated in sequence a predetermined number of times, as shown by the process flow arrow 610.
  • the exposure steps 604, 606, 608 maybe repeated a predetermined number of times as shown by the process arrow 614.
  • FIG. 6B is a process flow diagram for forming a mixed rare earth aluminate film according to yet another embodiment of the invention.
  • the process 620 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 622.
  • step 624 the substrate is sequentially exposed to a gas pulse containing a plurality of rare earth precursors each having a different rare earth metal element and a gas pulse with an oxygen-containing gas.
  • the relative concentration of each rare earth precursor may be independently controlled to tailor the composition of the resulting mixed rare earth aluminate film.
  • step 626 the substrate is sequentially exposed to a gas pulse of an aluminum precursor and gas pulse of an oxygen-containing gas.
  • the sequential exposure steps 624 and 626 may be repeated a predetermined number of times as depicted by the process flow arrow 628.
  • each of the exposure steps 624 and 626 may be independently repeated a predetermined number of times.
  • the process flow 620 may further include steps of purging or evacuating the process chamber after each gas pulse.
  • the purging or evacuating steps can aid in removing any unreacted rare earth precursor, byproducts, oxygen-containing gas, and aluminum precursor from the process chamber,
  • FIGS. 7 A - 7B are process flow diagrams for forming mixed rare earth aluminate films according embodiments of the invention.
  • the process flows of FIG. 7A - 7D may be performed by the ALD/PEALD systems 1/101 of FIGS. 1, 2, or any other suitable
  • ALD/PEALD systems configured to perform an ALD/PEALD process.
  • the process 700 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 702.
  • a substrate such as a semiconductor substrate
  • the substrate is sequentially exposed to a gas pulse containing a first rare earth precursor and a gas pulse of a nitrogen-containing gas.
  • the substrate is sequentially exposed to a gas pulse of a second rare earth precursor and a gas pulse of a nitrogen- containing gas.
  • the substrate is sequentially exposed to gas pulse of an aluminum precursor and a gas pulse of a nitrogen-containing gas.
  • the nitrogen-containing gas can contain NH 3 , N 2 H 4 , plasma excited nitrogen, or a combination thereof, and optionally an inert gas such as Ar.
  • the first rare earth (RE 1 ) precursor and second rare earth (RE2) precursors contain different rare earth metal elements for forming mixed rare earth aluminate films with a general chemical formula REl x RE2 y Al a N ⁇ , where x, y s a, and n are non-zero numbers
  • the sequential exposure steps 704 and 606 may be repeated a predetermined number of times, as shown by the process flow arrow 608, until a mixed rare earth aluminate film with a desired thickness has been formed.
  • the desired film thickness can depend on the type of semiconductor device or device region being formed. For example, the film thickness can be between about 5 angstroms and about 200 angstroms, or between about 5 angstroms and about 40 angstroms.
  • the process flow includes a deposition cycle containing sequential and alternating exposures of a pulse of a first rare earth precursor, a pulse of an nitrogen-containing gas, a pulse of a second rare earth precursor, a pulse of a nitrogen-containing gas, a pulse of an aluminum precursor, and a pulse of a nitrogen-containing gas.
  • the order of the sequential and alternating exposure steps 704, 706, 708 of the deposition cycle can be changed to effect film growth and film composition
  • each of the sequential exposure steps 704, 706, 708 may be independently repeated a predetermined number of times.
  • a deposition cycle can include ABX where ABX may be repeated a predetermined number of times (i.e., ABXABXABX etc.) until the desired film is formed.
  • ABXABXABX a predetermined number of times
  • a wide variety of other deposition cycles are possible including, for example, AABXAABX, ABBXABBX, ABXXABXX, AABXABBX, etc.
  • embodiments of the invention are not limited to these deposition cycles, as other combinations of A 5 B, and X may be utilized. Using these different deposition cycles, it is possible to deposit rare earth aluminum nitride films containing different amounts and different depth profiles of the first and second rare earth elements and aluminum in the resulting mixed rare earth aluminum nitride film.
  • additional pulse sequences containing additional rare earth precursors containing different rare earth elements may be added to the process flow depicted in FIG. 7A to form mixed rare earth aluminate films containing a plurality of different rare earth metal elements.
  • additional rare earth elements may be incorporated into the films by including additional pulse sequences containing sequential exposures of a gas pulse of a rare earth metal precursor and a gas pulse of a nitrogen- containing gas to each deposition cycle for each desired rare earth element.
  • a pulse sequence C containing sequential pulses of a third rare earth precursor and a nitrogen-containing gas may be added.
  • one deposition cycle can, for example, include ABCX, ABBCX, ABCCX, ABCXX, etc.
  • embodiments of the invention are not limited to these deposition cycles, as other combinations of A, B, C, and X may be utilized.
  • additional pulse sequences containing additional rare earth precursors containing different rare earth metal elements may be added to the process flow depicted in FIG. 7A to form mixed rare earth oxide films containing a three or more different rare earth metal elements.
  • additional rare earth elements may be incorporated into the films by adding pulse sequences containing a gas pulse of a rare earth precursor and gas pulse of an oxygen-containing gas for each additional rare earth metal element to be incorporated into the film.
  • a pulse sequence C containing a gas pulse of a third rare earth precursor and a gas pulse of an oxygen-containing gas may be added.
  • one deposition cycle can, for example, include ABCX, ABBCX, ABCCX, etc.
  • embodiments of the invention are not limited to these deposition cycles, as other combinations of A, B, C, and X may be utilized.
  • the process flow 700 may further include steps of purging or evacuating the process chamber after each gas pulse.
  • the purging or evacuating steps can aid in removing any unreacted rare earth precursor, byproducts, aluminum precursor, and nitrogen-containing gas from the process chamber between the alternating pulses of rare earth precursor, nitrogen-containing gas, and aluminum-containing gas.
  • the exposure steps 704 and 706 may be repeated in sequence a predetermined number of times, as shown by the process flow arrow 712, and exposure steps 706 and 708 may be repeated in sequence a predetermined number of times, as shown by the process flow arrow 710.
  • the exposure steps 704, 706, 708 may be repeated a predetermined number of times as shown by the process arrow 714.
  • FIG. 7B is a process flow diagram for forming a mixed rare earth aluminate film according to yet another embodiment of the invention.
  • the process 720 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 722.
  • step 724 the substrate is exposed to a gas pulse containing a plurality of rare earth precursors each having a different rare earth metal element and a gas pulse with a nitrogen-containing gas.
  • the relative concentration of each rare earth precursor may be independently controlled to tailor the composition of the resulting mixed rare earth aluminum nitride film.
  • step 726 the substrate is sequentially exposed to a pulse of an aluminum precursor and a gas pulse of a nitrogen-containing gas. According to one embodiment of the invention, the sequential exposure steps 724 and 726 may be repeated a predetermined number of times as depicted by the process flow arrow 728.
  • the process flow 720 may further include steps of purging or evacuating the process chamber after each gas pulse.
  • the purging or evacuating steps can aid in removing any unreacted rare earth precursor, byproducts, nitrogen-containing gas, and aluminum precursor from the process chamber.
  • FIGS. 8A - 8B are process flow diagrams for forming mixed rare earth aluminum oxynitride films according embodiments of the invention. The process flows of FIG. 8 A -
  • 8D may be performed by the ALD/PEALD systems 1/101 of FIGS. 1, 2, or any other suitable
  • ALD/PEALD systems configured to perform an ALD/PEALD process.
  • the process 800 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 802. hi step
  • the substrate is sequentially exposed to a gas pulse containing a first rare earth precursor and a gas pulse of an oxygen-containing gas, a nitrogen-containing gas, or an oxygen and nitrogen-containing gas.
  • the substrate is sequentially exposed to a gas pulse of a second rare earth precursor and gas pulse of an oxygen- containing gas, a nitrogen-containing gas, or an oxygen and nitrogen-containing gas.
  • the substrate is sequentially exposed to gas pulse of an aluminum precursor and a gas pulse of an oxygen-containing gas, a nitrogen-containing gas, or an oxygen and nitrogen- containing gas.
  • the oxygen-containing gas can include O 2 , H 2 O, H 2 O 2 , NO, NO 2 , N 2 O, ozone, or plasma excited oxygen, or a combination thereof, and optionally an inert gas such as Ar.
  • the nitrogen-containing gas can contain NH 3 , N 2 H 4 , NO, NO 2 , N 2 O 5 plasma excited nitrogen, or a combination thereof, and optionally an inert gas such as Ar.
  • the combination of steps 804 and 806 should include at least one gas pulse containing oxygen and at least one gas pulse containing nitrogen.
  • gases that include NO, NO 2 , or N 2 O contain both oxygen and nitrogen.
  • the first rare earth (REl) precursor and second rare earth (RE2) precursors contain different rare earth metal elements for forming mixed rare earth aluminum oxynitride films with a general chemical formula REl x RE2 y Al a 0 m N n , where x, y, a, m, and n are non-zero numbers.
  • the sequential exposure steps 804, 806, and 808 may be repeated a predetermined number of times, as shown by the process flow arrow 814, until a mixed rare earth aluminum oxynitride film with a desired thickness has been formed.
  • the desired film thickness can depend on the type of semiconductor device or device region being formed. For example, the film thickness can be between about 5 angstroms and about 200 angstroms, or between about 5angstroms and about 40 angstroms.
  • the process flow includes a deposition cycle containing sequential and alternating exposures of a pulse of a first rare earth precursor, gas pulse of an oxygen-, nitrogen- or oxygen and nitrogen- containing gas, a pulse of a second rare earth precursor, a gas pulse of an oxygen-, nitrogen- or oxygen and nitrogen- containing gas, a pulse of an aluminum precursor, and a gas pulse of an oxygen-, nitrogen- or oxygen and nitrogen-containing gas.
  • the order of the sequential and alternating exposure steps 804, 806, 808 of the deposition cycle can be changed to effect film growth and film composition.
  • each of the sequential exposure steps 804, 806, 808 may be independently repeated a predetermined number of times.
  • a deposition cycle can include ABX where ABX may be repeated a predetermined number of times (i.e., ABXABXABX etc.) until the desired film is formed.
  • ABXABXABX a predetermined number of times
  • a wide variety of other deposition cycles are possible including, for example, AABXAABX, ABBXABBX, ABXXABXX, AABXABBX, etc.
  • embodiments of the invention are not limited to these deposition cycles, as other combinations of A, B, and X may be utilized. Using these different deposition cycles, it is possible to deposit rare earth aluminum oxynitride films containing different amounts and different depth profiles of the first and second rare earth elements aluminum, nitrogen, and oxygen in the resulting mixed rare earth aluminum oxynitride film,
  • additional pulse sequences containing additional rare earth precursors containing different rare earth elements may be added to the process flow depicted in FIG. 8A to form mixed rare earth aluminum oxynitride films containing three or more different rare earth metal elements.
  • additional rare earth elements may be incorporated into the films by adding pulse sequences containing sequential exposures of a gas pulse of a rare earth metal precursor and an oxygen-, nitrogen- or oxygen and nitrogen-containing gas for each additional rare earth metal element to be incorporated into the film.
  • a pulse sequence C containing a gas pulse of a third rare earth precursor and an oxygen-, nitrogen- or oxygen and nitrogen- containing gas may be added.
  • one deposition cycle can, for example, include ABCX, ABBCX, ABCCX, ABCXX, etc.
  • embodiments of the invention are not limited to these deposition cycles, as other combinations of A, B, C, and X may be utilized.
  • the process flow 800 may further include steps of purging or evacuating the process chamber after each gas pulse. The purging or evacuating steps can aid in removing any unreacted rare earth precursor, byproducts, aluminum precursor, oxygen-containing gas, and nitrogen-containing gas from the process chamber between the alternating pulses of rare earth precursor, oxygen-containing, nitrogen- containing gas, and aluminum-containing gas.
  • the exposure steps 804 and 806 may be repeated in sequence a predetermined number of times, as shown by the process flow arrow 812, and exposure steps 806 and 808 maybe repeated in sequence a predetermined number of times, as shown by the process flow arrow 810. Furthermore, the exposure steps 804, 806, 808 may be repeated a predetermined number of times as shown by the process arrow 814.
  • FIG. 8B is a process flow diagram for forming a mixed rare earth aluminum oxynitride film according to yet another embodiment of the invention.
  • the process 820 begins when a substrate, such as a semiconductor substrate, is disposed in a process chamber of an ALD or PEALD system in step 822.
  • step 824 the substrate is simultaneously exposed to a gas pulse containing a plurality of rare earth precursors each having a different rare earth metal element and a gas pulse with an oxygen-, nitrogen- or oxygen and nitrogen-containing gas.
  • the relative concentration of each rare earth precursor may be independently controlled to tailor the composition of the resulting mixed rare earth oxynitride film.
  • step 826 the substrate is sequentially exposed to a gas pulse of an aluminum precursor an a gas pulse of an oxygen-, nitrogen- or oxygen and nitrogen-containing gas.
  • the sequential exposure steps 824 and 826 may be repeated a predetermined number of times as depicted by the process flow arrow 828.
  • the process flow 820 may further include steps of purging or evacuating the process chamber after each gas pulse.
  • the purging or evacuating steps can aid in removing any unreacted rare earth precursor, byproducts, oxygen-containing gas, nitrogen-containing gas, and aluminum precursor from the process chamber.
  • FIGS. 9 A and 9B schematically show cross-sectional views of semiconductor devices containing mixed rare earth based materials according to embodiments of the invention.
  • source and drain regions of the field emission transistors (FET) 90 and 91 are not shown.
  • the FET 90 in FIG. 9 A contains a semiconductor substrate 92, a mixed rare earth based film 96 that serves as a gate dielectric, and a conductive gate electrode film 98 over the film 96.
  • the mixed rare earth based film 96 can contain plurality of, i.e., at least two, different rare earth metal elements selected from Y, Lu, La, Ce, Pr, Nd, Sm, Eu, Gd, Th, Dy, Ho, Er, Tm, and Yb.
  • the mixed rare earth based film 96 can be a mixed rare earth oxide film, a mixed rare earth nitride film, a mixed rare earth oxynitride film, a mixed rare earth aluminate film, mixed rare earth aluminum nitride film, or a mixed rare earth aluminum oxynitride film.
  • a thickness of the mixed rare earth based film 96 can be between about 5 and about 200 angstroms, or between about 5 and about 40 angstroms.
  • the FET 90 further contains a gate electrode film 98 that can, for example, be between about 5nm and about lOnm thick and can contain poly-Si, a metal, or a metal- containing material, including W, WN, WSi x , Al, Mo, Ta, TaN, TaSiN 5 HfN, HfSiN, Ti 5 TiN, TiSiN, Mo, MoN, Re, Pt, or Ru.
  • a gate electrode film 98 can, for example, be between about 5nm and about lOnm thick and can contain poly-Si, a metal, or a metal- containing material, including W, WN, WSi x , Al, Mo, Ta, TaN, TaSiN 5 HfN, HfSiN, Ti 5 TiN, TiSiN, Mo, MoN, Re, Pt, or Ru.
  • the FET 91 in FIG. 9B is similar to the FET 90 in FlG. 9A but further contains an interface layer 94 between the mixed rare earth based film 96 and the substrate 92.
  • the interface layer 94 can, for example, be an oxide layer, a nitride layer, or an oxynitride layer.
  • the semiconductor devices can contain capacitors containing the mixed rare earth based materials.

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  • Insulated Gate Type Field-Effect Transistor (AREA)
  • Semiconductor Integrated Circuits (AREA)
PCT/US2007/065342 2006-03-31 2007-03-28 Method of forming mixed rare earth oxide and mixed rare earth aluminate films by atomic layer deposition Ceased WO2007115029A2 (en)

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CN2007800201206A CN101460658B (zh) 2006-03-31 2007-03-28 通过原子层沉积形成混合稀土氧化物和铝酸盐薄膜的方法
KR1020147000087A KR20140022454A (ko) 2006-03-31 2007-03-28 혼합 희토류 산화물 또는 알루미네이트 막의 형성 방법, 혼합 희토류 산화물막의 형성 방법, 및 혼합 희토류 알루미네이트막의 형성 방법
JP2009503240A JP2009532881A (ja) 2006-03-31 2007-03-28 原子層成膜により混合希土類酸化物およびアルミン酸塩の膜を形成する方法
KR1020087026749A KR101366541B1 (ko) 2006-03-31 2007-03-28 혼합 희토류 산화물 또는 알루미네이트 막의 형성 방법, 혼합 희토류 산화물막의 형성 방법, 및 혼합 희토류 알루미네이트막의 형성 방법

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CN101460658B (zh) 2011-11-09
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