US20010041460A1 - Method of depositing dielectric - Google Patents

Method of depositing dielectric Download PDF

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Publication number
US20010041460A1
US20010041460A1 US09/832,942 US83294201A US2001041460A1 US 20010041460 A1 US20010041460 A1 US 20010041460A1 US 83294201 A US83294201 A US 83294201A US 2001041460 A1 US2001041460 A1 US 2001041460A1
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dielectric
support
deposited
target
biased
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US09/832,942
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Claire Wiggins
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Aviza Europe Ltd
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Aviza Europe Ltd
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Assigned to TRIKON HOLDINGS LIMITED reassignment TRIKON HOLDINGS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LOUISE, CLAIRE, LOUISE
Publication of US20010041460A1 publication Critical patent/US20010041460A1/en
Priority to US10/336,923 priority Critical patent/US6936481B2/en
Assigned to AVIZA EUROPE LIMITED reassignment AVIZA EUROPE LIMITED CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: TRIKON HOLDINGS LIMITED
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
    • H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
    • H01L21/203—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy using physical deposition, e.g. vacuum deposition, sputtering
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/0021—Reactive sputtering or evaporation
    • C23C14/0036—Reactive sputtering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104—Forming layers
    • H01L21/02107—Forming insulating materials on a substrate
    • H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
    • H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
    • H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
    • H01L21/02266—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by physical ablation of a target, e.g. sputtering, reactive sputtering, physical vapour deposition or pulsed laser deposition
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/08—Oxides
    • C23C14/083—Oxides of refractory metals or yttrium
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/58—After-treatment
    • C23C14/5826—Treatment with charged particles
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/58—After-treatment
    • C23C14/5846—Reactive treatment
    • C23C14/5853—Oxidation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/018—Dielectrics
    • H01G4/06—Solid dielectrics
    • H01G4/08—Inorganic dielectrics
    • H01G4/12—Ceramic dielectrics
    • H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
    • H01G4/1254—Ceramic dielectrics characterised by the ceramic dielectric material based on niobium or tungsteen, tantalum oxides or niobates, tantalates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104—Forming layers
    • H01L21/02107—Forming insulating materials on a substrate
    • H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
    • H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
    • H01L21/02172—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
    • H01L21/02175—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal
    • H01L21/02183—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal the material containing tantalum, e.g. Ta2O5
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104—Forming layers
    • H01L21/02107—Forming insulating materials on a substrate
    • H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
    • H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
    • H01L21/02321—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer
    • H01L21/02323—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer introduction of oxygen
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104—Forming layers
    • H01L21/02107—Forming insulating materials on a substrate
    • H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
    • H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
    • H01L21/02337—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to a gas or vapour
    • H01L21/0234—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to a gas or vapour treatment by exposure to a plasma
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
    • H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
    • H01L21/314—Inorganic layers
    • H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
    • H01L21/31604—Deposition from a gas or vapour

Definitions

  • This invention relates to a method of depositing dielectric on a semiconductor substrate to form part of a capacitor.
  • Tantalum Pentoxide Ti 2 O 5
  • This material can be deposited by various chemical and physical means, but the most convenient for semiconductor work is active visual vapour deposition. This process is well known in general and is for example described in U.S. Pat. No. 5,111,355.
  • Tantalum is one of a class of materials in which the oxide forms on the surface of the metal target and is sputtered from the target, in contrast to other reactive processes where the oxide or nitride is formed in flight or on the surface of the substrate. Possibly because of this factor problems can arise from a relatively high leakage current through the deposited layer. As will be seen in U.S. Pat. No. 5,872,696 it is thought that this is in part due to pin holes and in part due to the presence of un-oxidised Tantalum atoms within the layer linking to form a leakage path. In that Patent a reduction of the leakage current is achieved by further anodisation of the Tantalum Pentoxide.
  • the present invention consists in a method of depositing dielectric on a semiconductor substrate on a support to form part of a capacitor including reactive sputtering the metal oxide layer from a target of the metal onto the substrate characterised in that the support is bias to induce a DC voltage across the deposited dielectric as it forms.
  • the induced voltage may be in the range of 200-300 volts and to achieve this the support may be bias by means of an RF or pulse DC power supply.
  • the target may also be bias by an RV or pulse DC power supply, the pulsed supply is preferred.
  • the method may further include the step of plasma oxidation of the deposited oxide after or during deposition.
  • the dielectric layer may be deposited on the first electrode and discrete second electrodes may be deposited on the upper surface to define a plurality of capacitors.
  • the area of each second electrode may be less than 0.01 cm 2 and capacitors have been formed with second electrode areas of 0.008 cm 2 .
  • the metal oxide is Tantalum Pentoxide, but it is believed that the method will show improvements with any metal oxide which is reactive sputtered from the target.
  • first electrode 10 (typically of Titanium Nitride) onto the surface of a substrate 11 and onto this they reactively sputter Tantalum Pentoxide 12 to form a dielectric layer.
  • Second electrodes are then formed by depositing dots 13 of Titanium Nitride through an aperture mask. Each dot then defines a single capacitor formed by the respective dot 13 the underlying area of the first electrode 10 and the intermediate portion of dielectric 12 .
  • Dielectric Ta 2 O 5 generally 100 ⁇ to 100 ⁇ thick, typically 500 ⁇ through different applications may require 1 micron thickness and the result reported below was for 100 ⁇ . In general thinner layers are preferred.
  • Wafer size 150 mm silicon
  • the capacitance dots 13 were probed under the application of 5 volts and the leakage current measured.
  • the batch of capacitors which had been formed without biasing the support had a leakage current >1 ⁇ 6 amps whereas those formed under the bias conditions had a leakage current of ⁇ 1 ⁇ 8 amps.
  • the thickness of the Tantalum Pentoxide was 100 ⁇ .
US09/832,942 2000-04-14 2001-04-12 Method of depositing dielectric Abandoned US20010041460A1 (en)

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US10/336,923 US6936481B2 (en) 2000-04-14 2003-01-06 Method of depositing dielectric

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GB0009139A GB2361244B (en) 2000-04-14 2000-04-14 A method of depositing dielectric
GB0009139.7 2000-04-14

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US (2) US20010041460A1 (zh)
JP (1) JP4833429B2 (zh)
KR (1) KR100740748B1 (zh)
CN (1) CN1203532C (zh)
GB (1) GB2361244B (zh)
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US7959769B2 (en) 2004-12-08 2011-06-14 Infinite Power Solutions, Inc. Deposition of LiCoO2
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US8105466B2 (en) 2002-03-16 2012-01-31 Springworks, Llc Biased pulse DC reactive sputtering of oxide films
US8197781B2 (en) 2006-11-07 2012-06-12 Infinite Power Solutions, Inc. Sputtering target of Li3PO4 and method for producing same
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US8431264B2 (en) 2002-08-09 2013-04-30 Infinite Power Solutions, Inc. Hybrid thin-film battery
US8445130B2 (en) 2002-08-09 2013-05-21 Infinite Power Solutions, Inc. Hybrid thin-film battery
US8508193B2 (en) 2008-10-08 2013-08-13 Infinite Power Solutions, Inc. Environmentally-powered wireless sensor module
US8518581B2 (en) 2008-01-11 2013-08-27 Inifinite Power Solutions, Inc. Thin film encapsulation for thin film batteries and other devices
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US8636876B2 (en) 2004-12-08 2014-01-28 R. Ernest Demaray Deposition of LiCoO2
US8728285B2 (en) 2003-05-23 2014-05-20 Demaray, Llc Transparent conductive oxides
US8906523B2 (en) 2008-08-11 2014-12-09 Infinite Power Solutions, Inc. Energy device with integral collector surface for electromagnetic energy harvesting and method thereof
US9334557B2 (en) 2007-12-21 2016-05-10 Sapurast Research Llc Method for sputter targets for electrolyte films
US9634296B2 (en) 2002-08-09 2017-04-25 Sapurast Research Llc Thin film battery on an integrated circuit or circuit board and method thereof
US10680277B2 (en) 2010-06-07 2020-06-09 Sapurast Research Llc Rechargeable, high-density electrochemical device

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US20060042930A1 (en) * 2004-08-26 2006-03-02 Daniele Mauri Method for reactive sputter deposition of a magnesium oxide (MgO) tunnel barrier in a magnetic tunnel junction
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KR100740748B1 (ko) 2007-07-19
KR20010098445A (ko) 2001-11-08
US20030096508A1 (en) 2003-05-22
GB2361244B (en) 2004-02-11
CN1326218A (zh) 2001-12-12
GB2361244A (en) 2001-10-17
TWI287850B (en) 2007-10-01
JP4833429B2 (ja) 2011-12-07
GB0009139D0 (en) 2000-05-31
JP2002033321A (ja) 2002-01-31
US6936481B2 (en) 2005-08-30

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