WO2007125837A1 - Ti膜の成膜方法 - Google Patents
Ti膜の成膜方法 Download PDFInfo
- Publication number
- WO2007125837A1 WO2007125837A1 PCT/JP2007/058663 JP2007058663W WO2007125837A1 WO 2007125837 A1 WO2007125837 A1 WO 2007125837A1 JP 2007058663 W JP2007058663 W JP 2007058663W WO 2007125837 A1 WO2007125837 A1 WO 2007125837A1
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- WIPO (PCT)
- Prior art keywords
- gas
- film
- plasma
- hole
- ticl
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 44
- 238000000151 deposition Methods 0.000 title description 6
- 150000002500 ions Chemical class 0.000 claims abstract description 28
- 239000007789 gas Substances 0.000 claims description 230
- 230000015572 biosynthetic process Effects 0.000 claims description 23
- 239000000758 substrate Substances 0.000 claims description 17
- 238000005121 nitriding Methods 0.000 claims description 13
- 238000003860 storage Methods 0.000 claims description 11
- 230000008021 deposition Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 229910003074 TiCl4 Inorganic materials 0.000 abstract 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 abstract 1
- 239000010408 film Substances 0.000 description 92
- 235000012431 wafers Nutrition 0.000 description 32
- 230000000694 effects Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 7
- 238000005229 chemical vapour deposition Methods 0.000 description 6
- 229910052756 noble gas Inorganic materials 0.000 description 5
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- 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
- C23C16/04—Coating on selected surface areas, e.g. using masks
- C23C16/045—Coating cavities or hollow spaces, e.g. interior of tubes; Infiltration of porous substrates
-
- 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
- C23C16/06—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 metallic material
- C23C16/08—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 metallic material from metal halides
- C23C16/14—Deposition of only one other metal element
-
- 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
- C23C16/45563—Gas nozzles
- C23C16/45565—Shower nozzles
-
- 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
- C23C16/505—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using radio frequency discharges
- C23C16/509—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using radio frequency discharges using internal electrodes
- C23C16/5096—Flat-bed apparatus
-
- 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
- C23C16/56—After-treatment
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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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table
- H01L21/28556—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table by chemical means, e.g. CVD, LPCVD, PECVD, laser CVD
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76843—Barrier, adhesion or liner layers formed in openings in a dielectric
Definitions
- the present invention discharges a processing gas containing TiCl gas from a shower head in a chamber.
- the present invention relates to a Ti film forming method for forming a Ti film on the surface of a substrate to be processed that is placed in a chamber.
- the circuit configuration tends to have a multilayer wiring structure. For this reason, a lower semiconductor substrate and an upper wiring are required. Embedding technology for electrical connection between layers such as contact holes that connect to layers and via holes that connect between upper and lower wiring layers is important
- Ti films such as these have been conventionally deposited using physical vapor deposition (PVD), but step coverage (step coverage) has become necessary due to device miniaturization and high integration requirements.
- PVD physical vapor deposition
- CVD chemical vapor deposition
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-197219
- a Ti film is formed by plasma CVD in which the above gas is turned into plasma and TiCl gas and H gas react.
- the present invention has been made in view of the strong situation, and when Ti is formed on a substrate to be processed having a small opening diameter and a Z or high aspect ratio hole by CVD using plasma.
- An object of the present invention is to provide a Ti film formation method that does not easily cause device damage due to charge-up damage.
- Another object of the present invention is to provide a computer readable storage medium for executing such a method.
- a substrate to be processed having a hole having a pore size of 0.13 ⁇ m or less and a hole or an aspect ratio of 10 or more is disposed in a chamber having a pair of parallel plate electrodes. Process and introducing a processing gas containing TiCl gas while reducing the number of parallel plate electrodes.
- a Ti film forming method comprising: introducing a rare gas having a higher atomic weight than TiCl gas, H gas, and Ar gas as a processing gas;
- a Ti film forming method for forming a Ti film while reducing the amount of ions reaching the bottom of the hole when plasma is formed.
- the rare gas having an atomic weight larger than that of Ar preferably has a gas flow force of 00 to 2000 mLZ (sccm) or a gas partial pressure of 14.58 to 666.50 Pa.
- the process gas has a larger atomic weight than NH gas, H gas, and Ar
- a substrate to be processed having a hole having a pore size of 0.13 ⁇ m or less and a hole or an aspect ratio of 10 or more is disposed in a chamber having a pair of parallel plate electrodes. Process and introducing a processing gas containing TiCl gas while reducing the number of parallel plate electrodes.
- a Ti film forming method comprising: forming a Ti film on a processing body; and introducing a rare gas having a higher atomic weight than TiCl gas, H gas, and Ar gas as a processing gas before
- TiCl gas, H gas, and Ar gas are introduced as the process gas to form the second stage.
- a method for forming a Ti film is provided.
- a computer-readable storage medium storing a control program that operates on a computer, and the control program is executed according to the first or second aspect at the time of execution.
- a computer readable storage medium that controls a film forming apparatus to perform the method.
- the unit of gas flow rate is mLZmin. Since the volume of gas is greatly changed by temperature and pressure, the value converted into the standard state is used in the present invention. Since the flow rate converted to the standard state is usually expressed in sccm (Standed Cubic Center per Minutes), sccm is also shown.
- the standard state here is the state (STP) at a temperature of 0 ° C (273.15K) and an atmospheric pressure latm (101325Pa).
- the present inventors consider that the charge-up damage is caused by the electron shading effect, and in order to reduce the electron shading effect, ions are made to enter the hole with a more oblique locus and reach the bottom of the hole. We realized that it was effective to reduce the amount.
- the conventional force is also used as the plasma gas, and instead of the Ar gas, the atomic weight is larger than that of the Ar gas, and a rare gas, that is, Kr or Xe is used, so that The kinetic energy in the horizontal direction is increased so that ions enter the hole with a more oblique trajectory. This point will be described in more detail.
- the source gas during film formation is supplied from a shower head provided at the top of the film formation apparatus and exhausted from an exhaust port under the susceptor, and the gas flow on the surface of the substrate to be processed Parallel. Ions in the plasma are accelerated vertically in the ion sheath and accumulated at the bottom of the hole.
- the atomic weight of ions constituting the plasma is large, the kinetic energy force of the component parallel to the substrate to be processed by the gas flow is larger than when using an element with a small atomic weight. For this reason, it is accelerated in the vertical direction within the ion sheath. Even in this case, ions enter the hole with a more oblique trajectory, and the amount of ions reaching the bottom of the hole decreases. As a result, charge accumulation at the bottom of the hole can be reduced, and charge-up damage due to the electronic shading effect can be reduced.
- the film is formed by such a method, the film is formed under completely different conditions from the conventional conditions, so that the film quality uniformity, the film forming speed, and the like may be inferior to the conventional ones.
- the first stage of film formation is performed under the above conditions that can reduce the charge-up damage, and when the Ti film is formed on the entire surface and there is no risk of charge-up damage, the conventional TiCl gas and
- Ti film can be formed with minimum disadvantages of floor formation.
- FIG. 1 is a schematic cross-sectional view showing an example of a Ti film forming apparatus used for carrying out a Ti film forming method according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing an example of the structure of a semiconductor wafer applied to the present invention.
- FIG. 3 is a diagram for explaining a mechanism that causes charge-up damage due to an electronic shading effect.
- FIG. 1 is a schematic cross-sectional view showing an example of a Ti film forming apparatus used for carrying out a Ti film forming method according to an embodiment of the present invention.
- the Ti film forming apparatus 100 is configured as a plasma CVD film forming apparatus that performs CVD film formation while forming plasma by forming a high-frequency electric field on parallel plate electrodes.
- This Ti film forming apparatus 100 has a substantially cylindrical chamber 1. Inside the chamber 1, a susceptor 2 for horizontally supporting a wafer W as a substrate to be processed is arranged in a state of being supported by a cylindrical support member 3 provided at the lower center of the susceptor. A guide ring 4 for guiding the wafer W is provided on the outer edge of the susceptor 2. In addition, a heater 5 is embedded in the susceptor 2, and the heater 5 is supplied with power from a heater power source 6 to heat the wafers W and W to be processed to a predetermined temperature. Susceptor 2 An electrode 8 functioning as a lower electrode of the parallel plate electrode is embedded in the vicinity of the surface of this electrode 8, and this electrode 8 is grounded.
- the susceptor 2 can be made of ceramics such as A1N. In this case, a ceramic heater is formed.
- a shower head 10 that also functions as an upper electrode of a parallel plate electrode is provided on the top wall la of the chamber 1 via an insulating member 9.
- the shower head 10 includes an upper block body 10a, a middle block body 10b, and a lower block body 10c, and has a substantially disk shape.
- the upper block body 10a has a horizontal portion 10d that constitutes a sharer head main body together with the middle block body 10b and the lower block body 10c, and an annular support portion 10e continuous above the outer periphery of the horizontal portion 10d, and is formed in a concave shape. ing.
- the entire shower head 10 is supported by the annular support portion 10e.
- Discharge holes 17 and 18 for discharging gas are alternately formed in the lower block body 10c.
- a first gas inlet 11 and a second gas inlet 12 are formed on the upper surface of the upper block body 10a.
- a large number of gas passages 13 are branched from the first gas introduction port 11.
- a gas passage 15 is formed in the middle block body 10b, and the gas passage 13 communicates with these gas passages 15 via a communication passage 13a extending horizontally. Further, the gas passage 15 communicates with the discharge hole 17 of the lower block body 10c.
- a large number of gas passages 14 are branched from the second gas introduction port 12.
- Gas passages 16 are formed in the middle block body 10b, and the gas passages 14 communicate with the gas passages 16.
- this gas passage 16 is connected to a communication passage 16a extending horizontally into the middle block body 10b, and this communication passage 16a communicates with a number of discharge holes 18 of the lower block body 10c.
- the first and second gas inlets 11 and 12 are connected to the gas line of the gas supply mechanism 20.
- the gas supply mechanism 20 supplies a C1F gas that is a cleaning gas C1F gas supply source 2
- TiCl gas supply source 22 for supplying TiCl gas, Ti compound gas, plasma generation gas
- the atomic weight is larger than that of Ar, the rare gas supply source 23 for supplying a rare gas, that is, Kr gas or Xe gas, the H gas supply source 24 for supplying H gas as a reducing gas, and the nitrogen N
- C1F gas supply lines 27 and 30b are connected to TiCl gas supply source 22.
- noble gas supply source 29 has a noble gas supply line
- H gas supply source 24 has an H gas supply.
- Supply line 30 is connected to NH gas supply source 25 with NH gas supply line 30a.
- each gas line is provided with two valves 31 sandwiching the mass flow controller 32 and the mass flow controller 32.
- the first gas introduction port 11 has a TiCl gas supply line extending from a TiCl gas supply source 22.
- TiCl gas supply line 28 is connected, and this TiCl gas supply line 28 extends from the C1F gas supply source 21.
- the C1F gas supply line 27 and the rare gas supply line 29 extending from the rare gas supply source 23 are connected.
- the second gas inlet 12 has an H gas extending from an H gas supply source 24.
- the second gas of the shower head 10 is introduced through the H gas supply gas line 30.
- the gas passes through the gas passages 14 and 16 and is discharged from the discharge hole 18 into the chamber 1. That is, the shower head 10 is completely independent of TiCl gas and H gas.
- This is a post-mix type that is fed into chamber 1, and these are mixed after discharge to cause a reaction. Note that this is not limited to this, and in a state where TiCl and H are mixed,
- It may be a premix type that is supplied in the chamber 1! /.
- a high frequency power source 34 is connected to the shower head 10 via a matching unit 33, and this high frequency power source 34 also supplies high frequency power to the shower head 10. By supplying high-frequency power from the high-frequency power source 34, the gas supplied into the chamber 1 through the shower head 10 is turned into plasma to perform film formation.
- a heater 45 for heating the shower head 10 is provided in the horizontal portion 10d of the upper block body 10a of the shower head 10.
- a heater power supply 46 is connected to the heater 45, and power is supplied from the heater power supply 46 to the heater 45 to the shower. 10 is heated to the desired temperature.
- a heat insulating member 47 is provided in the recess of the upper block body 40a in order to increase the heating efficiency by the heater 45.
- a circular hole 35 is formed in the center of the bottom wall lb of the chamber 1, and an exhaust chamber 36 that protrudes downward is provided on the bottom wall lb so as to cover the hole 35. .
- An exhaust pipe 37 is connected to the side surface of the exhaust chamber 36, and an exhaust device 38 is connected to the exhaust pipe 37. By operating the exhaust device 38, the inside of the chamber 1 can be depressurized to a predetermined degree of vacuum.
- the susceptor 2 is provided with three (two only shown) wafer support pins 39 for supporting the wafer W to be moved up and down so as to protrude and retract with respect to the surface of the susceptor 2. 39 is fixed to the support plate 40. The wafer support pins 39 are lifted and lowered via the support plate 40 by a drive mechanism 41 such as an air cylinder.
- a drive mechanism 41 such as an air cylinder.
- a loading / unloading port 42 for loading / unloading the wafer W to / from a wafer transfer chamber (not shown) provided adjacent to the chamber 1, and a gate for opening / closing the loading / unloading port 42.
- a start valve 43 for opening / closing the loading / unloading port 42.
- the constituent parts of the Ti film forming apparatus 100 are connected to and controlled by a control part 50 that also has a computer power.
- the control unit 50 also includes a keyboard on which the process manager manages command input to manage the Ti film deposition apparatus 100, and a display that visualizes and displays the operating status of the Ti film deposition apparatus 100.
- a user interface 51 is connected, which is also of equal power.
- the control unit 50 includes a control program for realizing various processes executed by the Ti film deposition apparatus 100 under the control of the control unit 50, and each configuration of the Ti film deposition apparatus 100 according to the processing conditions.
- a storage unit 52 that stores a program for causing the unit to execute processing, that is, a recipe, is connected.
- the recipe may be stored in a hard disk or semiconductor memory, or may be set at a predetermined position in the storage unit 52 while being stored in a portable storage medium such as a CDROM or DVD. Furthermore, the recipe may be appropriately transmitted from another device via, for example, a dedicated line. Then, if necessary, an arbitrary recipe is called from the storage unit 52 by an instruction from the user interface 51 and is executed by the control unit 50, so that the Ti film forming apparatus 10 is controlled under the control of the control unit 50. The desired processing at 0 is performed. Next, the Ti film forming method according to the present embodiment in the Ti film forming apparatus 100 as described above will be described.
- a semiconductor wafer W on which a Ti film is to be formed has a structure shown in FIG. That is, the gate electrode 103 is formed on the silicon substrate 101 via the gate insulating film 102, the interlayer insulating film 104 and the metal wiring layer 105 are formed around and on the gate electrode 103, and the metal wiring layer 105 and the gate electrode 103 Are connected by embedded wiring 106. On the metal wiring layer 105, an interlayer insulating film 108 in which a via hole 107 is formed is formed. Further, a trench 109 is formed in the interlayer insulating film 104.
- the inside of the chamber 1 is adjusted in the same manner as the external atmosphere connected via the gate valve 43, and then the gate valve 43 is opened.
- the wafer transfer chamber force (not shown) in the vacuum state also carries the wafer W having the above structure into the chamber 1 through the loading / unloading port 42.
- Ueno and W are preheated while supplying a rare gas into the chamber 1.
- Preflow is performed by flowing TiCl gas and a pre-flow line at a specified flow rate.
- the lines are switched to the film forming line, and these gases are introduced into the chamber 1 through the shower head 10.
- high frequency power is applied to the shower head 10 from the high frequency power source 34, whereby the rare gas, H gas, and TiCl gas introduced into the chamber 1 are turned into plasma.
- the heater 5 is applied to the shower head 10 from the high frequency power source 34, whereby the rare gas, H gas, and TiCl gas introduced into the chamber 1 are turned into plasma.
- the plasmaized gas reacts on the wafer W heated to react to deposit Ti on the wafer W.
- the electron e is difficult to reach the bottom of the hole.
- the ion i is accelerated by the ion sheath S and reaches the bottom of the hole.
- the bottom of 107 is positively charged (electronic shading effect).
- the trench 109 is wide, electrons e that move isotropically easily reach the bottom thereof. For this reason, a potential difference is generated between the bottom of the via hole 107 and the bottom of the trench 109, and an electric field is generated in the gate insulating film 102. This phenomenon becomes more prominent as the opening diameter of the via hole 107 is smaller and the aspect ratio is larger.
- dielectric breakdown may occur in the gate insulating film 102 and the device may be destroyed (charge-up damage).
- This kind of charge-up damage has occurred to a degree that cannot be ignored when the hole diameter is less than 0.13 m and the Z or aspect ratio is more than 10. I came.
- the present inventors reduced the amount of ions reaching the bottom of the hole by making ions enter the hole with a more oblique locus. Found that it was effective. For this purpose, it has been found that it is effective to use a rare gas having a larger atomic weight than Ar gas, that is, Kr or Xe, instead of Ar gas which has been conventionally used as a plasma gas.
- a rare gas having a larger atomic weight than Ar gas that is, Kr or Xe
- Ar gas which has been conventionally used as a plasma gas.
- Ions in the plasma are accelerated vertically in the ion sheath and accumulated at the bottom of the hole (via hole 107).
- the kinetic energy force of the component parallel to the wafer W of the ions caused by the gas flow is used. Bigger than the case. For this reason, even when accelerated in the vertical direction within the ion sheath, ions enter the hole with a more oblique locus, and the amount of ions reaching the bottom of the hole decreases. As a result, charge accumulation at the bottom of the hole can be reduced, and charge-up damage due to the electron shading effect can be reduced.
- the process conditions in the present embodiment are performed in accordance with conditions for forming a Ti film by normal plasma CVD, and the following conditions are exemplified.
- the Ti film formation time is appropriately set according to the film thickness to be obtained.
- the Ti film may be nitrided as necessary.
- the TiCl gas is stopped and the H gas is removed.
- the chamber 1 While keeping the gas and noble gas flowing, the chamber 1 is heated to an appropriate temperature and NH gas is flowed as a nitriding gas. Along with this, high frequency power supply 34 power shower head 40
- a high-frequency power is applied to plasma the process gas, and the surface of the Ti thin film deposited on the wafer and W is nitrided by the plasma process gas.
- a separate Ar gas line is used, and Ar gas is used as a rare gas, so that nitriding can be performed under the same conditions as before.
- the atomic weight is larger than Ar gas! /, Kr gas which is a rare gas Or just use Xe gas as it is.
- Ti film may not be deposited on the sidewalls of contact holes and via holes. In this case, conduction is not established between the upper part of the hole and the bottom part of the hole. In the nitriding process using gas, charge-up damage may occur. Therefore, from the viewpoint of suppressing charge-up damage during nitriding, As in the case, it is preferable to use Kr gas or Xe gas, which has a larger atomic weight than Ar gas and is a rare gas. In order to prevent charge-up damage more completely, it is preferable to perform nitriding without generating plasma.
- Preferred conditions for the nitriding treatment when Ar gas is used as the rare gas are as follows.
- Ar gas flow rate 2000mLZmin (sccm) or less, preferably 800 ⁇ 2000mLZmin (sec m)
- the flow rate of rare gas is preferably 2000 mLZmin (sccm) or less, more preferably 800 to 2000 mLZmin (sccm) (corresponding to 14.58 to 666.50 Pa in terms of gas partial pressure). .
- this step is not essential, it is preferably performed from the viewpoint of preventing oxidation of the Ti film.
- the inside of the chamber 1 is adjusted in the same manner as the external atmosphere connected via the gate valve 43, and then the gate valve 43 is opened and the loading / unloading port 42 is opened. Unload the wafer W to the wafer transfer chamber.
- the chamber 1 is cleaned. This process is performed in the chamber 1 through the C1F gas supply line 27 from the C1F gas supply source 21 in the state where no wafer exists in the chamber 1.
- the film formation conditions of the Ti film are completely different from the conventional conditions in order to reduce the charge-up damage of the element due to the electronic shading effect. Uniformity, film formation speed, etc. may be inferior to conventional ones. From the viewpoint of suppressing such disadvantages as much as possible, in the apparatus of FIG. 1, an Ar gas supply source and a pipe are provided in addition to the rare gas supply source 23, and the charge-up damage is unlikely to occur as the first stage.
- the conventional TiCl gas When the Ti film is formed by the process and there is no risk of charge-up damage, the conventional TiCl gas,
- the second stage film formation Since the charge-up damage does not occur after the Ti film is formed on the entire wafer surface, it is only necessary to switch to the second stage film formation condition when the Ti film is formed on the entire wafer surface. As a result, the film formation process can be performed under the conditions that the film quality uniformity, the film formation speed, etc. are as good as possible while minimizing the film formation under the condition of low film quality uniformity where charge-up damage hardly occurs.
- the conditions for this second stage include TiCl gas
- Ar gas flow rate 1600 to 2000 mLZmin (sccm) is preferable.
- plasma CVD is performed by simultaneously supplying TiCl gas, H gas, and rare gas.
- an SFD process may be used that alternates. Instead, supply TiCl gas and rare gas
- ALD process that alternately performs the first step and the second step of supplying H gas and rare gas
- the substrate to be processed is not limited to a semiconductor wafer, but may be another substrate such as a liquid crystal display (LCD) substrate.
- LCD liquid crystal display
- the present invention is applicable to a Ti film forming method for forming a Ti film on the surface of a substrate to be processed.
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JP2001040477A (ja) * | 1999-06-11 | 2001-02-13 | Applied Materials Inc | 窒化チタンの厚膜を堆積する方法 |
JP2004197219A (ja) * | 2002-12-05 | 2004-07-15 | Tokyo Electron Ltd | 成膜方法 |
JP2004285469A (ja) * | 2003-01-31 | 2004-10-14 | Tokyo Electron Ltd | 載置台、処理装置及び処理方法 |
JP2004343032A (ja) * | 2003-04-21 | 2004-12-02 | Tokyo Electron Ltd | 被処理体の昇降機構及び処理装置 |
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JP2001040477A (ja) * | 1999-06-11 | 2001-02-13 | Applied Materials Inc | 窒化チタンの厚膜を堆積する方法 |
JP2004197219A (ja) * | 2002-12-05 | 2004-07-15 | Tokyo Electron Ltd | 成膜方法 |
JP2004285469A (ja) * | 2003-01-31 | 2004-10-14 | Tokyo Electron Ltd | 載置台、処理装置及び処理方法 |
JP2004343032A (ja) * | 2003-04-21 | 2004-12-02 | Tokyo Electron Ltd | 被処理体の昇降機構及び処理装置 |
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