WO2021060037A1 - 基板液処理方法及び基板液処理装置 - Google Patents
基板液処理方法及び基板液処理装置 Download PDFInfo
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- WO2021060037A1 WO2021060037A1 PCT/JP2020/034626 JP2020034626W WO2021060037A1 WO 2021060037 A1 WO2021060037 A1 WO 2021060037A1 JP 2020034626 W JP2020034626 W JP 2020034626W WO 2021060037 A1 WO2021060037 A1 WO 2021060037A1
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- substrate
- metal
- barrier layer
- diffusion barrier
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- 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
- H01L21/76877—Filling of holes, grooves or trenches, e.g. vias, with conductive material
- H01L21/76879—Filling of holes, grooves or trenches, e.g. vias, with conductive material by selective deposition of conductive material in the vias, e.g. selective C.V.D. on semiconductor material, plating
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
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- C23C18/1851—Pretreatment of the material to be coated of surfaces of non-metallic or semiconducting in organic material
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- C23C18/1889—Multistep pretreatment with use of metal first
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- C—CHEMISTRY; METALLURGY
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
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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
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- H—ELECTRICITY
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
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- 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
- H01L21/288—Deposition of conductive or insulating materials for electrodes conducting electric current from a liquid, e.g. electrolytic deposition
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
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- 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
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—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
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- H01L21/76841—Barrier, adhesion or liner layers
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- H01L21/76855—After-treatment introducing at least one additional element into the layer
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- H01L21/76877—Filling of holes, grooves or trenches, e.g. vias, with conductive material
- H01L21/76883—Post-treatment or after-treatment of the conductive material
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/532—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body characterised by the materials
- H01L23/53204—Conductive materials
- H01L23/53209—Conductive materials based on metals, e.g. alloys, metal silicides
- H01L23/53228—Conductive materials based on metals, e.g. alloys, metal silicides the principal metal being copper
- H01L23/53238—Additional layers associated with copper layers, e.g. adhesion, barrier, cladding layers
Definitions
- the present disclosure relates to a substrate liquid treatment method and a substrate liquid treatment apparatus.
- Patent Document 1 a cap layer is formed on a metal wiring, a barrier metal layer is formed on a connection hole reaching the metal wiring and an inner wall of a wiring groove connected to the connection hole, and a metal layer is embedded in the connection hole and the wiring groove.
- the present disclosure provides an advantageous technique for improving the adhesion between the metal deposited in the recess of the substrate and the surface partitioning the recess in the electroless plating process in which the plating metal is deposited from the bottom in the recess. To do.
- One aspect of the present disclosure is a step of preparing a substrate having a recess, a diffusion barrier layer for partitioning the recess, and a wiring exposed at the bottom of the recess, and a step of preparing a substrate, and metal is not deposited even if an electroless plating solution comes into contact with the substrate. It includes a step of adhering a concentration of metal ions to the diffusion barrier layer and a step of supplying an electroless plating solution to the recesses to deposit metal in the recesses while the metal ions are adhered to the diffusion barrier layer.
- the present invention relates to a substrate liquid treatment method.
- FIG. 1 is a diagram illustrating a cross section of a part of the substrate, and shows an example of the flow of the electroless plating process.
- FIG. 2 is a diagram illustrating a partial cross section of the substrate, and shows an example of the flow of the electroless plating process.
- FIG. 3 is a diagram illustrating a partial cross section of the substrate, and shows an example of the flow of the electroless plating process.
- FIG. 4 is a diagram illustrating a partial cross section of the substrate, and shows an example of the flow of the electroless plating process.
- FIG. 5 is a diagram showing an outline of an example of an ion processing unit including a metal ion imparting unit.
- FIG. 1 is a diagram illustrating a cross section of a part of the substrate, and shows an example of the flow of the electroless plating process.
- FIG. 2 is a diagram illustrating a partial cross section of the substrate, and shows an example of the flow of the electroless plating process.
- FIG. 3 is
- FIG. 6 is a diagram showing an outline of an example of a plating processing unit including an electroless plating solution application unit.
- FIG. 7 is a diagram showing an outline of an example of a heat treatment unit including a heating unit.
- FIG. 8 is a diagram showing an outline of an example of a processing system.
- an apparatus and method for embedding a metal (particularly copper) that functions as a via (through wiring) in a via hole (that is, a recess) by electroless plating will be exemplified.
- the substrate liquid treatment apparatus and the substrate liquid treatment method according to the present disclosure are not limited to the apparatus and method exemplified below.
- the apparatus and method according to the present disclosure can be applied to the case where metal is embedded in a recess (including a hole and a groove) other than a via hole.
- the substrate liquid treatment apparatus and the substrate liquid treatment method according to the present disclosure can be applied. It is possible.
- FIGS. 1 to 4 are views illustrating a cross section of a part of the substrate W (particularly the portion having the via hole 11), and show an example of the flow of the electroless plating process.
- the substrate W has a via hole 11 and a trench 12 formed in the insulating film 21, a diffusion barrier layer 13 provided on the insulating film 21 for partitioning the via hole 11 and the trench 12, and a cap layer exposed at the bottom of the via hole 11 ( Wiring) 14 and.
- the insulating film 21 is provided on the etching stop layer 22, and the insulating film 21 provided above and the insulating film 21 provided below are separated by the etching stop layer 22.
- the first metal wiring 23 made of copper is embedded in the region partitioned by the diffusion barrier layer 13.
- the upper surface of the first metal wiring 23 is covered with the cap layer 14.
- the via hole 11 and the trench 12 are located on the opposite side of the first metal wiring 23 via the cap layer 14.
- the via hole 11 and the cap layer 14 are provided so as to penetrate the etching stop layer 22 provided between the insulating film 21 provided above and the insulating film 21 provided below.
- the insulating film 21 can be formed of a low dielectric constant insulating material film (so-called Low-k film) or silicon dioxide (SiO 2 ).
- the etching stop layer 22 can be made of silicon carbon nitride (SiCN) or other silicon-based material (for example, silicon nitride (SiN) or silicon carbide (SiC)).
- the diffusion barrier layer 13 prevents the wiring (copper in this example) provided in the via hole 11 and the trench 12 from diffusing into the insulating film 21, and prevents tantalum (Ta), tantalum nitride (TaN), titanium (Ti), or titanium nitride.
- the cap layer 14 is composed of a material that acts as a catalyst core for a plating reaction in an electroless plating process for embedding a metal (via) in the via hole 11, and in this example in which copper is embedded in the via hole 11, it is composed of, for example, cobalt (Co). It is possible.
- a substrate W having the above configuration is prepared (see FIG. 1). Then, the metal ions 15 are attached to the diffusion barrier layer 13 that partitions the via holes 11 of the substrate W (see FIG. 2). At this time, the metal ions 15 having a concentration that does not precipitate copper (metal) even when the electroless plating solution containing copper ions comes into contact with them are attached to the diffusion barrier layer 13. The metal ion 15 is attached to the diffusion barrier layer 13 that partitions the via hole 11, but may be attached to the diffusion barrier layer 13 that partitions the trench 12.
- the metal ion 15 adhered to the diffusion barrier layer 13 has excellent bondability with the plated metal embedded in the via hole 11.
- the metal ion 15 having excellent bondability with copper embedded in the via hole 11 is attached to the diffusion barrier layer 13, and typically at least one of palladium (Pd), ruthenium (Ru) and platinum (Pt).
- the metal ion 15 may contain either ion.
- the method of adhering the metal ions 15 to the diffusion barrier layer 13 at a concentration that does not precipitate copper (metal) even when the electroless plating solution containing copper ions comes into contact with the diffusion barrier layer 13 is not limited.
- a liquid (metal ion-containing liquid) in which the metal ions 15 having a sufficiently diluted concentration may be dispersed may be applied (for example, coated) to the exposed surface of the diffusion barrier layer 13.
- a treatment of applying a rinse liquid (for example, pure water) to the surface of the diffusion barrier layer 13 to which the metal ions 15 are attached is performed on the diffusion barrier layer 13. A part of the attached metal ion 15 may be washed away and removed.
- a treatment for strengthening the adhesive force of the metal ions 15 to the diffusion barrier layer 13 may be performed. For example, even if the diffusion barrier layer 13 to which the metal ions 15 are attached is heated to a high temperature (for example, about 200 ° C. to 300 ° C.) in an atmosphere of a low oxygen concentration (for example, an oxygen concentration of 50 ppm or less). Good.
- the electroless plating solution 20 is supplied to the via hole 11 (see FIG. 3), and the metal constituting the second metal wiring 24 is provided to the via hole 11 (in this example). Copper) is deposited (see FIG. 4). That is, the cap layer 14 exposed at the bottom of the via hole 11 acts as a catalyst nucleus, and the copper precipitated by the electroless plating treatment is selectively deposited on the cap layer 14.
- the metal ion 15 adhering to the diffusion barrier layer 13 has a concentration that does not precipitate copper even when the electroless plating solution 20 comes into contact with the metal ion 15.
- the plating metal (copper) is grown from the bottom of the via hole 11, but the plating metal is not grown from the diffusion barrier layer 13. .. Therefore, the plated metal is gradually deposited in the via hole 11 from the bottom to the upper side, and the second metal wiring 24 is formed.
- the electroless plating process in which the plating metal is deposited from the bottom in the via hole 11 has an advantage that the plating metal can be selectively deposited in the via hole 11 while effectively preventing the generation of voids (cavities).
- the plated metal in the via hole 11 is bonded to the diffusion barrier layer 13. They are just in contact without doing anything. Therefore, the adhesion between the plating metal in the via hole 11 and the diffusion barrier layer 13 is not always good. For example, in an environment accompanied by a temperature change, problems such as stress migration due to the displacement of the plating metal with respect to the diffusion barrier layer 13 may occur. There is concern about the occurrence.
- the electroless plating treatment of the via hole 11 is performed in a state where the metal ions 15 having a low concentration such that the metal is not precipitated even if the electroless plating solution comes into contact with the diffusion barrier layer 13. Is done.
- the low-concentration metal ion 15 adhering to the diffusion barrier layer 13 exerts an anchor effect and acts as a binder for strengthening the adhesion between the plated metal in the via hole 11 and the diffusion barrier layer 13. Therefore, the plated metal in the via hole 11 is relatively firmly fixed to the diffusion barrier layer 13, and even if it is placed in an environment accompanied by a large temperature change, it is unlikely to be displaced from the diffusion barrier layer 13. Therefore, according to the present embodiment, the plating metal is deposited from the bottom of the via hole 11 to prevent the generation of voids, and the plating metal is in good contact with the diffusion barrier layer 13 to effectively cause problems such as stress migration. Can be prevented.
- any treatment not described above may be performed before, during, or during the above-mentioned substrate liquid treatment method.
- the metal wiring is also embedded in the trench 12 by electroless plating treatment or other treatment.
- the substrate W (particularly the treated surface) may be subjected to a cleaning treatment, a rinsing treatment and / or a drying treatment before and after the above-mentioned substrate liquid treatment method.
- the bonding strength of the second metal wiring 24 to the diffusion barrier layer 13 is increased. You may.
- FIG. 5 is a diagram showing an outline of an example of an ion processing unit 30a including a metal ion imparting unit 31.
- the specific configuration of each element of the metal ion imparting unit 31 is not limited, and each element of the metal ion imparting unit 31 is shown in a simplified manner in FIG.
- the metal ion imparting unit 31 imparts metal ions 15 to the substrate W, and adheres metal ions 15 having a “concentration that does not precipitate metal even if the electroless plating solution 20 comes into contact with the diffusion barrier layer 13” to the diffusion barrier layer 13.
- the illustrated metal ion imparting unit 31 includes a first discharge unit 32, a first substrate holding unit 35, a first cup structure 36, and a first inert gas supply unit, which are movably provided by a first discharge drive unit 34.
- the 37 and the first heating unit 38 including the first heater 38a are included.
- the first discharge unit 32, the first discharge drive unit 34, the first substrate holding unit 35, the first cup structure 36, and the first heating unit 38 are installed inside the first processing chamber 39.
- the first substrate holding portion 35 holds the substrate W rotatably.
- the first substrate holding portion 35 shown in the drawing sucks and holds the back surface of the substrate W, but the specific method for holding the substrate W is not limited.
- the first discharge unit 32 has at least a nozzle (not shown) that discharges a liquid containing metal ions 15 (metal ion-containing liquid).
- the first discharge unit 32 may be provided so that other fluids can be discharged. For example, a cleaning liquid for cleaning the substrate W or a rinse liquid for flushing the substrate W may be discharged from the first discharge unit 32. ..
- two or more types of fluids may be discharged from a common nozzle, and the first discharge units 32 are of different types from each other. It may have two or more nozzles for discharging the fluid.
- the first cup structure 36 having a ring-shaped planar shape is provided so as to surround the substrate W held by the first substrate holding portion 35.
- the first cup structure 36 receives the liquid scattered from the substrate W and guides it to a drain duct (not shown), or arranges the gas flow so as to prevent the gas around the substrate W from diffusing.
- the specific configuration of the first cup structure 36 is not limited.
- the first cup structure 36 may have a cup mainly for guiding the liquid and a cup mainly for adjusting the flow of gas as separate bodies.
- the first heating unit 38 is provided so as to be able to move up and down by a drive mechanism (not shown). For example, when the substrate W is heated, the first heating portion 38 is arranged at a lower position and brought closer to the substrate W. On the other hand, when the substrate W is not heated, the first heating portion 38 is arranged at an upper position and kept away from the substrate W. While the first discharge unit 32 is located above the substrate W, the first heating unit 38 is arranged at a height position that does not contact or collide with the first discharge unit 32 and the first discharge drive unit 34.
- the first inert gas supply unit 37 supplies the inert gas (for example, nitrogen) into the first processing chamber 39.
- the first treatment chamber 39 is basically sealed, and outside air does not enter the first treatment chamber 39.
- the first processing chamber 39 does not necessarily require complete airtightness, and enables the ingress of outside air into the inside (particularly, the ingress of outside air into the periphery of the substrate W held by the first substrate holding portion 35). It suffices if it can be sealed to the extent that it can be prevented.
- the metal ion 15 is imparted to the substrate W by the ion treatment unit 30a having the above-described configuration.
- the substrate W is introduced into the first processing chamber 39 of the ion processing unit 30a, and the processing surface (upper surface) of the substrate W from the first ejection unit 32 while the substrate W is held by the first substrate holding portion 35. ),
- the liquid containing the metal ion 15 is discharged.
- the liquid containing the metal ions 15 may be applied to the processing surface of the substrate W while the substrate W is rotated by the first substrate holding portion 35.
- the rinse liquid may be discharged from the first discharge unit 32 to supply the rinse liquid to the treated surface of the substrate W.
- metal ions 15 having a concentration that does not precipitate metal even when the electroless plating solution 20 comes into contact remains on the treated surface of the substrate W (particularly, the diffusion barrier layer 13 that partitions the via holes 11 (recesses) of the substrate).
- the rinsing process is performed. Specifically, the concentration of the metal ions 15 remaining on the treated surface of the substrate W is adjusted by changing the amount of the rinse liquid applied to the substrate W, the application time of the rinse liquid, and / or the rotation speed of the substrate W.
- the dried treatment and / or heat treatment of the treated surface of the substrate W is performed. Will be done.
- the drying process of the substrate W may be performed by rotating the substrate W at high speed by the first substrate holding unit 35, or a gas (for example, an inert gas from the first inert gas supply unit 37) is applied to the substrate W. It may be done by spraying. Further, the drying treatment and the heat treatment of the substrate W may be performed at the same time.
- the first heating unit 38 by arranging the first heating unit 38 at a lower position and bringing the heat-generating first heater 38a closer to the processing surface of the substrate W, it is possible to simultaneously perform the drying treatment and the heat treatment of the substrate W. ..
- the metal ions 15 are attached to the substrate W (particularly the diffusion barrier layer 13). The force of attachment can be effectively increased.
- the substrate W on which the "metal ions 15 having a concentration that does not deposit metal even when the electroless plating solution 20 comes into contact" adheres to the diffusion barrier layer 13 is transferred from the ion treatment unit 30a to the plating treatment unit. Be transported.
- FIG. 6 is a diagram showing an outline of an example of a plating processing unit 30b including an electroless plating solution application unit 51.
- the specific configuration of each element of the electroless plating solution application unit 51 is not limited, and each element of the electroless plating solution application unit 51 is shown in a simplified manner in FIG.
- the electroless plating solution application unit 51 provided in the plating treatment unit 30b supplies the electroless plating solution 20 to the via holes 11 of the substrate W on which the metal ions 15 are attached to the diffusion barrier layer 13, and deposits metal in the via holes 11.
- the electroless plating solution application unit 51 shown is the second discharge unit 52, the second substrate holding unit 56, the second cup structure 57, and the second inert gas, which are movably provided by the second discharge drive unit 55.
- the supply unit 58 and the second heating unit 59 including the second heater 59a are included.
- the second discharge unit 52, the second discharge drive unit 55, the second substrate holding unit 56, the second cup structure 57, and the second heating unit 59 are installed inside the second processing chamber 60.
- the second substrate holding portion 56 rotatably holds the substrate W.
- the second substrate holding portion 56 has an arbitrary configuration, may be configured in the same manner as the first substrate holding portion 35 (see FIG. 5) described above, or has a configuration different from that of the first substrate holding portion 35. You may be doing it.
- the second discharge unit 52 has at least a nozzle (not shown) that discharges the electroless plating solution 20.
- the second discharge unit 52 may be provided so as to be able to discharge another fluid.
- a cleaning liquid for cleaning the substrate W and a rinsing liquid for flushing the substrate W may be discharged from the second discharge unit 52.
- two or more types of fluids may be discharged from a common nozzle, and the second discharge units 52 are of different types from each other. It may have two or more nozzles for discharging the fluid.
- the second cup structure 57 receives the liquid scattered from the substrate W and guides it to a drain duct (not shown), or arranges the gas flow so as to prevent the gas around the substrate W from diffusing.
- the specific configuration of the second cup structure 57 is not limited.
- the second cup structure 57 of the electroless plating solution application unit 51 typically has a ring-shaped planar shape, and is provided so as to surround the substrate W held by the second substrate holding portion 56.
- the second inert gas supply unit 58 supplies the inert gas (for example, nitrogen) into the second processing chamber 60.
- the second heating unit 59 is provided so as to be able to move up and down by a drive mechanism (not shown). While the second discharge unit 52 is located above the substrate W, the second heating unit 59 is arranged at a height position that does not contact or collide with the second discharge unit 52 and the second discharge drive unit 55.
- the electroless plating solution 20 is applied to the substrate W by the plating processing unit 30b having the above configuration, and the plating metal (copper in this example) is embedded in each via hole 11.
- the substrate W is introduced into the second processing chamber 60, and the substrate W is held by the second substrate holding portion 56, and the substrate W is not directed from the second ejection portion 52 toward the processing surface (upper surface) of the substrate W.
- the electrolytic plating solution 20 is discharged.
- the electroless plating solution 20 may be applied to the treated surface of the substrate W while the substrate W is rotated by the second substrate holding portion 56.
- the state in which the electroless plating solution 20 is applied to the entire treated surface of the substrate W is maintained, and the plating metal (copper in this example) is deposited and grows in each via hole 11.
- the electroless plating solution 20 on the substrate W may be heated by the second heating unit 59 to promote the deposition of the plating metal.
- the electroless plating solution 20 on the substrate W can be heated by arranging the second heating unit 59 at a lower position and bringing the heat-generating second heater 59a closer to the processing surface of the substrate W.
- metal is also embedded in the trench 12.
- the metal embedded in the trench 12 is physically and electrically connected to the second metal wiring 24 in the via hole 11.
- the metal can be embedded in the trench 12 by any method.
- a plated metal can be embedded in the trench 12 by a known electroless plating method or electrolytic plating method.
- the substrate W in which the metal is embedded in the via hole 11 and the trench 12 as described above is conveyed from the plating treatment unit 30b to the heat treatment unit.
- the substrate W in which the metal is embedded in the via hole 11 and the trench 12 may undergo a rinsing treatment, a drying treatment, and other treatments in the plating treatment unit 30b before being sent to the heat treatment unit.
- FIG. 7 is a diagram showing an outline of an example of a heat treatment unit 30c including a heating unit 65.
- the specific configuration of each element of the heating unit 65 is not limited, and each element of the heating unit 65 is shown in a simplified manner in FIG.
- the heating unit 65 heats the substrate W after depositing metal in the recesses of the substrate W (particularly the via hole 11), and heats the substrate W with the divided screen (particularly the diffusion barrier layer 13) of the recesses of the substrate W and the metal wiring (particularly the second metal wiring). 24) Increases the bond strength with.
- the illustrated heating unit 65 includes a third heating unit 66 including a third heater 66a and a third inert gas supply unit 67.
- the third heating unit 66 is installed inside the third processing chamber 68.
- the third inert gas supply unit 67 supplies the inert gas to the inside of the third processing chamber 68.
- the third processing chamber 68 is basically sealed, and outside air does not enter the third processing chamber 68.
- the third processing chamber 68 does not necessarily need to be completely hermetically sealed, and may be hermetically sealed to such an extent that the ingress of outside air into the inside can be effectively prevented.
- the series of treatments performed by the ion treatment unit 30a (see FIG. 5), the plating treatment unit 30b (see FIG. 6), and the heat treatment unit 30c (see FIG. 7) described above are, for example, the treatment system schematically shown in FIG. It is feasible at 80.
- the processing system 80 shown in FIG. 8 has an loading / unloading station 91 and a processing station 92.
- the loading / unloading station 91 includes a mounting section 81 including a plurality of carriers C, and a transport section 82 provided with a first transport mechanism 83 and a delivery section 84.
- a plurality of substrates W are housed in each carrier C in a horizontal state.
- the processing station 92 is provided with a plurality of processing units 30 installed on both sides of the transport path 86, and a second transport mechanism 85 that reciprocates in the transport path 86.
- At least a part of the plurality of processing units 30 provided in the processing station 92 is configured to be able to execute at least one of the above-mentioned series of processes. That is, each of the ion treatment unit 30a (see FIG. 5), the plating treatment unit 30b (see FIG. 6), and the heat treatment unit 30c (see FIG. 7) is composed of one or more treatment units 30 shown in FIG.
- the substrate W is taken out from the carrier C by the first transfer mechanism 83, placed on the delivery section 84, and taken out from the delivery section 84 by the second transfer mechanism 85. Then, the substrate W is sequentially carried into the processing units 30 corresponding to the above-mentioned series of processing by the second transport mechanism 85, is subjected to a predetermined processing by each processing unit 30, and is taken out from each processing unit 30. That is, the substrate W is first carried into the processing unit 30 corresponding to the ion processing unit 30a by the second transport mechanism 85, and undergoes the metal ion imparting process.
- the substrate W is carried into the processing unit 30 corresponding to the plating processing unit 30b by the second transport mechanism 85, and undergoes a plating metal deposition process using the electroless plating solution 20.
- the substrate W is carried into the processing unit 30 corresponding to the heat treatment unit 30c by the second transport mechanism 85, and undergoes the plating metal heat treatment.
- the substrate W that has undergone the above series of treatments is mounted on the delivery section 84 by the second transport mechanism 85, and then returned to the carrier C of the mounting section 81 by the first transport mechanism 83.
- the processing system 80 includes a control device 93.
- the control device 93 is composed of, for example, a computer, and includes a control unit and a storage unit. Programs and data for various processes performed by the processing system 80 are stored in the storage unit of the control device 93.
- the control unit of the control device 93 controls various devices of the processing system 80 and performs various processes by appropriately reading and executing a program stored in the storage unit. Therefore, the control device 93 controls the operations of the various devices, the first transport mechanism 83, and the second transport mechanism 85 provided in the ion treatment unit 30a, the plating treatment unit 30b, and the heat treatment unit 30c described above. A series of processes is carried out.
- the programs and data stored in the storage unit of the control device 93 may be those recorded on a storage medium that can be read by a computer, and may be installed in the storage unit from the storage medium.
- Examples of storage media that can be read by a computer include a hard disk (HD), a flexible disk (FD), a compact disk (CD), a magnet optical disk (MO), and a memory card.
- the metal ion addition treatment, the metal deposition treatment, and the plating metal heat treatment are each performed by different treatment units 30 (that is, the ion treatment unit 30a, the plating treatment unit 30b, and the heat treatment unit 30c).
- the ion treatment unit 30a, the plating treatment unit 30b, and the heat treatment unit 30c are each performed by different treatment units 30.
- some or all of these series of processes may be performed in a common processing unit 30 (ie, in the same processing chamber).
- the above-mentioned metal ion imparting treatment and metal deposition treatment can be performed in a single manner. It is possible to carry out with the processing unit 30 of. Further, by providing the "nozzle for discharging the electroless plating solution 20" and the “third heating unit 66" in a common processing chamber, the metal deposition treatment and the plating metal heat treatment are carried out in a single processing unit 30. Is possible.
- first heating unit 38 shown in FIG. 5 and the second heating unit 59 shown in FIG. 6 are provided so as to be able to move up and down, but these first heating unit 38 and the second heating unit 59 are fixedly provided.
- the first heater 38a may be built in the first substrate holding portion 35 (see FIG. 5), and the first substrate holding portion 35 may function as the first heating portion 38.
- a second heater 59a may be built in the second substrate holding portion 56 (see FIG. 6), and the second substrate holding portion 56 may function as the second heating portion 59.
- the third heating unit 66 shown in FIG. 7 is fixedly provided, the third heating unit 66 may be provided so as to be movable.
- the third heating unit 66 may be provided so as to be able to move up and down like the first heating unit 38 shown in FIG. Further, in the metal ion imparting unit 31 (see FIG. 5), it is not necessary to install the first heating unit 38 when the heat treatment is not performed. Similarly, in the electroless plating solution application unit 51 (see FIG. 6), it is not necessary to install the second heating unit 59 when the heat treatment is not performed.
- first heater 38a (see FIG. 5), the second heater 59a (see FIG. 6), and the third heater 66a (see FIG. 7) may be turned on and off by the control device 93 (see FIG. 8).
- the calorific value may be controlled.
- the cap layer 14 is provided at the bottom of the via hole 11, but the cap layer 14 may not be provided.
- the wiring for example, the first metal wiring 23
- the wiring that becomes the catalyst core of the plating metal deposited in the via hole 11 at the bottom of the via hole 11
- the technical categories that embody the above-mentioned technical ideas are not limited.
- the above-mentioned substrate liquid processing apparatus may be applied to other apparatus.
- the above-mentioned technical idea may be embodied by a computer program for causing a computer to execute one or a plurality of procedures (steps) included in the above-mentioned substrate liquid treatment method.
- the above-mentioned technical idea may be embodied by a non-transitory recording medium in which such a computer program is recorded and can be read by a computer.
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Abstract
Description
上述の例では、金属イオン付与処理、金属堆積処理及びめっき金属加熱処理のそれぞれがお互いに別の処理ユニット30(すなわちイオン処理ユニット30a、めっき処理ユニット30b、加熱処理ユニット30c)で行われる。しかしながら、これらの一連の処理の一部又は全部が、共通の処理ユニット30(すなわち同一の処理チャンバー内)で行われてもよい。
Claims (7)
- 凹部と、前記凹部を区画する拡散バリア層と、前記凹部の底部において露出する配線と、を有する基板を準備する工程と、
無電解めっき液が接触しても金属を析出させない濃度の金属イオンを、前記拡散バリア層に付着させる工程と、
前記拡散バリア層に前記金属イオンが付着している状態で、前記凹部に前記無電解めっき液を供給して前記凹部に前記金属を析出させる工程と、を含む基板液処理方法。 - 前記凹部に前記金属を析出させる工程では、前記金属を前記凹部の前記底部から成長させて、前記拡散バリア層からは前記金属を成長させない請求項1に記載の基板液処理方法。
- 前記金属イオンは、パラジウム、ルテニウム及び白金のうちの少なくともいずれかのイオンを含む請求項1又は2に記載の基板液処理方法。
- 前記拡散バリア層に前記金属イオンを付着させる工程は、前記金属イオンが付着している前記拡散バリア層の面にリンス液を付与する処理を含む請求項1~3のいずれか一項に記載の基板液処理方法。
- 前記拡散バリア層に前記金属イオンを付着させる工程は、前記金属イオンが付着している前記拡散バリア層を加熱する処理を含む請求項1~4のいずれか一項に記載の基板液処理方法。
- 前記凹部に前記金属を析出させた後に前記基板を加熱する工程を含む請求項1~5のいずれか一項に記載の基板液処理方法。
- 凹部と、前記凹部を区画する拡散バリア層と、前記凹部の底部において露出する配線とを有する基板に金属イオンを付与し、無電解めっき液が接触しても金属を析出させない濃度の金属イオンを前記拡散バリア層に付着させる金属イオン付与ユニットと、
前記拡散バリア層に前記金属イオンが付着している前記基板の前記凹部に前記無電解めっき液を供給し、前記凹部に前記金属を析出させる無電解めっき液付与ユニットと、を備える基板液処理装置。
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JP2021548807A JP7203995B2 (ja) | 2019-09-25 | 2020-09-14 | 基板液処理方法及び基板液処理装置 |
US17/754,081 US20220344205A1 (en) | 2019-09-25 | 2020-09-14 | Substrate liquid processing method and substate liquid processing apparatus |
KR1020227012905A KR20220069036A (ko) | 2019-09-25 | 2020-09-14 | 기판 액 처리 방법 및 기판 액 처리 장치 |
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JP2002110784A (ja) * | 2000-09-26 | 2002-04-12 | Handotai Rikougaku Kenkyu Center:Kk | 多層配線構造の製造方法及びその構造 |
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JP2001015517A (ja) * | 1999-07-02 | 2001-01-19 | Ebara Corp | 半導体装置及びその製造方法 |
JP2002110784A (ja) * | 2000-09-26 | 2002-04-12 | Handotai Rikougaku Kenkyu Center:Kk | 多層配線構造の製造方法及びその構造 |
JP2006513325A (ja) * | 2003-01-23 | 2006-04-20 | アドバンスト・マイクロ・ディバイシズ・インコーポレイテッド | 触媒を用いた無電解めっきによりパターン化された絶縁体上に金属層を形成する方法 |
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TW202117075A (zh) | 2021-05-01 |
KR20220069036A (ko) | 2022-05-26 |
JPWO2021060037A1 (ja) | 2021-04-01 |
US20220344205A1 (en) | 2022-10-27 |
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