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Chemical vapor deposition process for fabricating layered superlattice materials

Assignee: Symetrix Corp
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Filing: 1993-07-12
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Granted: 1997-07-15
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Expires: 2013-07-12
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Abstract

Abstract A substrate is prebaked in an oxygen furnace. A thin film of layered superlattice oxide is formed on the substrate by a chemical vapor deposition process. The film is RTP baked to provide grains with a mixed phase of A-axis and C-axis orientation. The film may be treated by ion implantation prior to the RTP bake and oxygen furnace annealed after the RTP bake. An electrode is deposited on the layered superlattice thin film and then the film and electrode are oxygen furnace annealed.

Inventors

  • 👤 Carlos A. Paz de Araujo
  • 👤 Hitoshi Watanabe
  • 👤 Michael C. Scott
  • 👤 Takashi Mihara

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 01:58
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/44; C23C16/455; C23C16/45561; C23C16/02; C23C16/0209; C23C16/0218; C23C16/22; C23C16/30; C23C16/40; C23C16/56; C30; C30B; C30B25/00; C30B25/02; C30B29/00; C30B29/60; C30B29/68; C30B7/00; C30B7/005; H; H01; H01C; H01C7/00; H01C7/10; H01C7/1013; H10; H10B; H10B12/00; H10B12/30; H10B53/00; H10D; H10D1/00; H10D1/60; H10D1/68; H10D1/682; H10D1/684; H10D1/692; H10P; H10P14/00; H10P14/60; H10P14/63; H10P14/6326; H10P14/6328; H10P14/6334; H10P14/65; H10P14/6516; H10P14/6529; H10P14/6544; H10P14/69; H10P14/692; H10P14/6938; H10P14/69398

Claims Analysis

Total Claims: 19
Claim 1
Independent Claim 119 words
A method of fabricating an integrated circuit including a ferroelectric layered superlattice material containing at least three different metals, said layered superlattice material having alternating ferroelectric and non-ferroelectric layers, said method comprising the steps of: providing a substrate; depositing on said substrate a film including said at least three different metals in effective amounts for yielding said layered superlattice material containing said at least three different metals, utilizing a chemical vapor deposition process; and heating said film to crystallize it into a layer of said layered superlattice material containing said at least three different metals in a phase having a higher polarizability than prior to said step of heating said layered superlattice material being less than 1 micron thick.
Claim 2
Independent Claim 119 words
A method of fabricating an integrated circuit including a ferroelectric layered superlattice material containing at least three different metals, said layered superlattice material having alternating ferroelectric and non-ferroelectric layers, said method comprising the steps of: providing a substrate; depositing on said substrate a film including said at least three different metals in effective amounts for yielding said layered superlattice material containing said at least three different metals, utilizing a chemical vapor deposition process; and heating said film to crystallize it into a layer of said layered superlattice material containing said at least three different metals in a phase having a higher polarizability than prior to said step of heating said layered superlattice material being less than 1 micron thick.
Claim 3
Dependent Claim 64 words
A method as in claim 1 wherein said step of heating comprises baking said film using a rapid thermal process (RTP) in which the temperature is ramped over a range of from 1° C. per second to 300° C. per second and up to a temperature of from 500° C. to 850° C. for a holding period of from 5 seconds to 5 minutes.
Claim 4
Dependent Claim 17 words
A method as in claim 1 wherein said step of heating includes annealing in an oxygen furnace.
Claim 5
Dependent Claim 21 words
A method as in claim 1 and further including the step of prebaking said substrate prior to said step of depositing.
Claim 6
Dependent Claim 43 words
A method as in claim 1 wherein said step of depositing comprises the steps of: providing a precursor comprising a metal alkoxide including at least one of said metals; vaporizing said precursor; and using said vaporized precursor in said chemical vapor deposition process.
Claim 7
Dependent Claim 15 words
A method as in claim 1 wherein said layered superlattice material comprises strontium bismuth tantalate.
Claim 8
Dependent Claim 29 words
A method as in claim 1 wherein said step of heating forms a mixed phase of C-axis oriented grains and A-axis oriented grains of said ferroelectric layered superlattice material.
Claim 9
Dependent Claim 32 words
A method as in claim 1 wherein said substrate comprises a silicon layer and an electrode, said electrode located between said silicon layer and said layer of said ferroelectric layered superlattice material.
Claim 10
Dependent Claim 43 words
A method as in claim 1 wherein said layered superlattice material includes a metal from a group consisting of strontium, calcium, barium, cadmium, lead, tantalum, hafnium, tungsten, niobium zirconium, bismuth, scandium, yttrium, lanthanum and the lanthanides, antimony, chromium, molybdenum, vanadium, ruthenium and thallium.
Claim 11
Dependent Claim 34 words
A method of fabricating an integrated circuit as in claim 1 and further including the step of: prebaking said substrate in an oxygen furnace at a temperature of between 500° C. and 1000° C.
Claim 12
Dependent Claim 43 words
A method as in claim 10 wherein said layered superlattice material includes a metal from a group consisting of strontium, calcium, barium, cadmium, lead, tantalum, hafnium, tungsten, niobium zirconium, bismuth, scandium, yttrium, lanthanum and the lanthanides, antimony, chromium, molybdenum, vanadium, ruthenium and thallium.
Claim 13
Independent Claim 123 words
A method of fabricating an integrated circuit including ferroelectric layered superlattice material containing at least three different metals, said layered superlattice material having alternative ferroelectric and non-ferroelectric layers, said method comprising the steps of: providing a substrate; depositing on said substrate a film including said at least three different metals in effective amounts for yielding said layered superlattice material containing said at least three metals, utilizing a chemical vapor deposition process; forming an electrode on said film; and annealing said film and said electrode in an oxygen furnace, to form a thin film of said ferroelectric layered superlattice material containing said at least three different metals, said ferroelectric layered superlattice material being less than one micron thick between said substrate and said electrode.
Claim 14
Independent Claim 123 words
A method of fabricating an integrated circuit including ferroelectric layered superlattice material containing at least three different metals, said layered superlattice material having alternative ferroelectric and non-ferroelectric layers, said method comprising the steps of: providing a substrate; depositing on said substrate a film including said at least three different metals in effective amounts for yielding said layered superlattice material containing said at least three metals, utilizing a chemical vapor deposition process; forming an electrode on said film; and annealing said film and said electrode in an oxygen furnace, to form a thin film of said ferroelectric layered superlattice material containing said at least three different metals, said ferroelectric layered superlattice material being less than one micron thick between said substrate and said electrode.
Claim 15
Dependent Claim 78 words
A method as in claim 12 and further including the step of baking said film using a rapid thermal process (RTP) prior to said step of forming an electrode, said rapid thermal process being a process in which temperature is ramped over a range of from 1° C. per second to 300° C. per second and to an upper temperature of from 500° C. to 850° C. for a holding period of from 5 seconds to 5 minutes.
Claim 16
Independent Claim 285 words
A method of fabricating an integrated circuit including a ferroelectric layered superlattice material containing at least three different metals, said layered superlattice material having alternating ferroelectric and non-ferroelectric layers, said method comprising the steps of: providing a substrate; depositing a thin film on said substrate utilizing a chemical vapor deposition process, said thin film including said at least three different metals in effective amounts for yielding said ferroelectric layered superlattice material having the formula A1 w1 +a1 A2 w2 +a2 . . . Aj wj +aj S1 x1 +s1 S2 x2 +s2 . . . Sk xk +sk B1 y1 +b1 B2 y2 +b2 . . . Bl yl +bl Q z -2 , where A1, A2 . . . Aj represent A-site elements in a perovskite-like structure, S1, S2 . . . Sk represent superlattice generator elements, B1, B2 . . . Bl represent B-site elements in said perovskite-like structure, Q represents an anion, the superscripts indicate valences of the respective elements, the subscripts indicate an average number of atoms of the element in the unit cell, and at least w1 and y1 are non-zero, and wherein said A-site element comprises one or more elements from a group consisting of strontium, calcium, barium, and lead, said B-site element comprises one or more elements from a group consisting of titanium, tantalum, hafnium, tungsten, niobium zirconium, said superlattice generator element comprises one or more elements from a group consisting of bismuth, scandium, yttrium, lanthanum, antimony, chromium, and thallium, and said anion comprises an element from a group consisting of oxygen, fluorine, chlorine and hybrids thereof; and heating said thin film to crystallize it into a layer of said layered superlattice material less than 1 micron thick.
Claim 17
Independent Claim 285 words
A method of fabricating an integrated circuit including a ferroelectric layered superlattice material containing at least three different metals, said layered superlattice material having alternating ferroelectric and non-ferroelectric layers, said method comprising the steps of: providing a substrate; depositing a thin film on said substrate utilizing a chemical vapor deposition process, said thin film including said at least three different metals in effective amounts for yielding said ferroelectric layered superlattice material having the formula A1 w1 +a1 A2 w2 +a2 . . . Aj wj +aj S1 x1 +s1 S2 x2 +s2 . . . Sk xk +sk B1 y1 +b1 B2 y2 +b2 . . . Bl yl +bl Q z -2 , where A1, A2 . . . Aj represent A-site elements in a perovskite-like structure, S1, S2 . . . Sk represent superlattice generator elements, B1, B2 . . . Bl represent B-site elements in said perovskite-like structure, Q represents an anion, the superscripts indicate valences of the respective elements, the subscripts indicate an average number of atoms of the element in the unit cell, and at least w1 and y1 are non-zero, and wherein said A-site element comprises one or more elements from a group consisting of strontium, calcium, barium, and lead, said B-site element comprises one or more elements from a group consisting of titanium, tantalum, hafnium, tungsten, niobium zirconium, said superlattice generator element comprises one or more elements from a group consisting of bismuth, scandium, yttrium, lanthanum, antimony, chromium, and thallium, and said anion comprises an element from a group consisting of oxygen, fluorine, chlorine and hybrids thereof; and heating said thin film to crystallize it into a layer of said layered superlattice material less than 1 micron thick.
Claim 18
Dependent Claim 43 words
A method as in claim 14 wherein said step of depositing comprises the steps of: providing a precursor comprising a metal alkoxide including at least one of said metals; vaporizing said precursor; and using said vaporized precursor in said chemical vapor deposition process.
Claim 19
Dependent Claim 15 words
A method as in claim 15 wherein said layered superlattice material comprises strontium bismuth tantalate.

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Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2000-07-14 2001-01-13 2001-07-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2004-07-14 2005-01-13 2005-07-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2008-07-14 2009-01-13 2009-07-15 $7700.00 Window Closed / Lapsed

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