WO2022210043A1 - エッチング方法及びエッチング装置 - Google Patents
エッチング方法及びエッチング装置 Download PDFInfo
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- WO2022210043A1 WO2022210043A1 PCT/JP2022/012748 JP2022012748W WO2022210043A1 WO 2022210043 A1 WO2022210043 A1 WO 2022210043A1 JP 2022012748 W JP2022012748 W JP 2022012748W WO 2022210043 A1 WO2022210043 A1 WO 2022210043A1
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- 238000005530 etching Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000012545 processing Methods 0.000 claims abstract description 98
- 239000000758 substrate Substances 0.000 claims abstract description 87
- 239000011368 organic material Substances 0.000 claims abstract description 37
- 239000007789 gas Substances 0.000 claims description 87
- 230000008569 process Effects 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 229910003481 amorphous carbon Inorganic materials 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 64
- 150000002500 ions Chemical class 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
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- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
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- 230000006866 deterioration Effects 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 239000012044 organic layer Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005513 bias potential Methods 0.000 description 1
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- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000013529 heat transfer fluid Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- H01L21/02—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
- H01L21/30—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
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31127—Etching organic layers
- H01L21/31133—Etching organic layers by chemical means
- H01L21/31138—Etching organic layers by chemical means by dry-etching
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- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
- H01J37/32091—Radio frequency generated discharge the radio frequency energy being capacitively coupled to the plasma
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- H01J37/32—Gas-filled discharge tubes
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- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0332—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their composition, e.g. multilayer masks, materials
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- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0334—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/0337—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
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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
- H01L21/30—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
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- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
- H01L21/31116—Etching inorganic layers by chemical means by dry-etching
- H01L21/31122—Etching inorganic layers by chemical means by dry-etching of layers not containing Si, e.g. PZT, Al2O3
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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
- H01L21/30—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
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31144—Etching the insulating layers by chemical or physical means using masks
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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
- H01L21/67—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
- H01L21/67017—Apparatus for fluid treatment
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- H01L21/67069—Apparatus for fluid treatment for etching for drying etching
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- H01J2237/32—Processing objects by plasma generation
- H01J2237/33—Processing objects by plasma generation characterised by the type of processing
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Definitions
- the present disclosure relates to an etching method and an etching apparatus.
- Patent Document 1 a patterned photoresist mask, an underlying intermediate mask layer, an underlying functional organic mask layer, and an underlying etching layer are disclosed. A method is disclosed for controlling the critical dimension (CD) of the etched features in the etched layer in the stack.
- CD critical dimension
- the technique according to the present disclosure appropriately forms high-aspect-ratio holes in an organic material layer that serves as a mask for forming a pattern in an etching target layer.
- One aspect of the present disclosure is a substrate etching method performed using a substrate processing apparatus, wherein the substrate processing apparatus includes a processing chamber that forms a processing space for the substrate, and is provided inside the processing chamber, a substrate support that holds the substrate; and a power source that supplies bias power to at least the substrate support, and the etching method comprises: (a) an underlying layer; (b) generating a plasma within the processing chamber; and (c) applying and removing bias power to the substrate support. and repeating periodically, wherein in the step (c), the OFF time during which the bias power is not supplied is set to 10 milliseconds or more in the period.
- the “duty ratio” is the ratio (on duty) of the ON time (time to supply high frequency power) per cycle (ON time + OFF time) of high frequency power supplied in a pulse shape. shall say.
- “circularity” refers to the ratio of the minimum diameter to the maximum diameter (min diameter/max diameter) in the cross-sectional shape of the hole formed in the organic material layer.
- holes with a high aspect ratio can be appropriately formed in an organic material layer that serves as a mask for forming a pattern in a layer to be etched.
- FIG. 1 is a longitudinal sectional view schematically showing an example of the configuration of a plasma processing system
- FIG. FIG. 4 is an explanatory diagram showing states of an etching target layer and an organic material layer before and after etching processing
- FIG. 10 is an explanatory diagram showing deterioration of roundness and generation of bowing in an organic material layer
- 4 is a graph showing an example of high frequency power supply to a substrate support
- FIG. 10 is an explanatory diagram showing an example of etching processing results according to the example
- FIG. 10 is an explanatory diagram showing an example of etching processing results according to the example;
- a patterned mask layer for example, An etching process is performed using an amorphous carbon layer (ACL) as a mask. Formation of a pattern on this mask layer is generally performed in a plasma processing apparatus.
- ACL amorphous carbon layer
- Patent Document 1 discloses a method for etching mask layers (intermediate mask layer and functional organic layer) inside a plasma processing apparatus (etching chamber). Specifically, after an etching gas is introduced into an etching chamber in which a substrate having a mask layer formed thereon is loaded, the interior of the etching chamber is regulated by supplying high frequency waves from a radio frequency (RF) source to the electrodes. plasma is generated to sequentially and selectively etch the intermediate mask layer and the functional organic layer.
- RF radio frequency
- FIG. 1 is a vertical cross-sectional view showing an outline of the configuration of a plasma processing system.
- the plasma processing system includes an inductively coupled (ICP) plasma processing apparatus 1 and a control unit 2.
- the plasma processing apparatus 1 includes a plasma processing chamber 10 , a gas supply section 20 , a power supply 30 and an exhaust system 40 .
- Plasma processing chamber 10 includes a dielectric window.
- the plasma processing apparatus 1 also includes a substrate support 11 , a gas inlet and an antenna 14 .
- a substrate support 11 is positioned within the plasma processing chamber 10 .
- Antenna 14 is positioned above or above plasma processing chamber 10 (ie, above or above dielectric window 101).
- the plasma processing chamber 10 has a plasma processing space 10 s defined by a dielectric window 101 , sidewalls 102 of the plasma processing chamber 10 and the substrate support 11 .
- the plasma processing chamber 10 has at least one gas supply port for supplying at least one processing gas to the plasma processing space 10s and at least one gas exhaust port for exhausting gas from the plasma processing space 10s.
- the substrate support 11 includes a body portion 111 and a ring assembly 112 .
- the body portion 111 has a central region 111 a (substrate support surface) for supporting the substrate (wafer) W and an annular region 111 b (ring support surface) for supporting the ring assembly 112 .
- the annular region 111b of the body portion 111 surrounds the central region 111a of the body portion 111 in plan view.
- the substrate W is placed on the central region 111a, and the ring assembly 112 is placed on the annular region 111b so as to surround the substrate W on the central region 111a.
- the main body 111 includes a base (not shown) and an electrostatic chuck (not shown).
- the base includes an electrically conductive member.
- the conductive member of the base functions as a lower electrode.
- An electrostatic chuck is arranged on the base.
- the top surface of the electrostatic chuck has a central region 111a and an annular region 111b as described above.
- Ring assembly 112 includes one or more annular members, at least one of which is an edge ring.
- the substrate support 11 may include a temperature control module configured to control at least one of the electrostatic chuck, the ring assembly 112 and the substrate W to a target temperature.
- the temperature control module may include heaters, heat transfer media, flow paths, or combinations thereof.
- the substrate support 11 may also include a heat transfer gas supply configured to supply a heat transfer gas between the back surface of the substrate W and the substrate support surface.
- the gas introduction section is configured to introduce at least one processing gas from the gas supply section 20 into the plasma processing space 10s.
- the gas inlet includes a Center Gas Injector (CGI) 13 .
- a central gas injector 13 is located above the substrate support 11 and is attached to a central opening formed in the dielectric window 101 .
- the central gas injection part 13 has at least one gas supply port 13a, at least one gas channel 13b, and at least one gas introduction port 13c.
- the processing gas supplied to the gas supply port 13a passes through the gas flow path 13b and is introduced into the plasma processing space 10s from the gas introduction port 13c.
- the gas introduction part includes one or more side gas injectors (SGI) attached to one or more openings formed in the side wall 102. may include
- the gas supply unit 20 may include at least one gas source 21 and at least one flow controller 22 .
- gas supply 20 is configured to supply at least one process gas from respective gas sources 21 via respective flow controllers 22 to central gas injector 13 .
- Each flow controller 22 may include, for example, a mass flow controller or a pressure controlled flow controller.
- gas supply 20 may include one or more flow modulation devices that modulate or pulse the flow of at least one process gas.
- Power supply 30 includes an RF power supply 31 coupled to plasma processing chamber 10 via at least one impedance matching circuit.
- RF power supply 31 is configured to supply at least one RF signal (RF power), such as a source RF signal and a bias RF signal, to the conductive member (lower electrode) of substrate support 11 and antenna 14 .
- RF power source 31 may function as at least part of a plasma generator configured to generate a plasma from one or more process gases in plasma processing chamber 10 .
- a bias RF signal to the lower electrode, a bias potential is generated in the substrate W, and ions in the formed plasma can be drawn into the substrate W.
- the RF power supply 31 includes a first RF generator 31a and a second RF generator 31b.
- the first RF generator 31a is coupled to the antenna 14 and generates a source RF signal (source RF power: hereinafter sometimes referred to as "high frequency power HF") for plasma generation via at least one impedance matching circuit. configured to generate
- the source RF signal has a frequency within the range of 13 MHz to 150 MHz.
- the first RF generator 31a may be configured to generate multiple source RF signals having different frequencies. The generated one or more source RF signals are provided to antenna 14 .
- the second RF generator 31b is coupled to the lower electrode via at least one impedance matching circuit, and generates a bias RF signal as bias power (bias RF power: hereinafter sometimes referred to as "high frequency power LF"). configured to generate In one embodiment, the bias RF signal has a lower frequency than the source RF signal. In one embodiment, the bias RF signal has a frequency within the range of 400 kHz to 13.56 MHz. In one embodiment, the second RF generator 31b may be configured to generate multiple bias RF signals having different frequencies. One or more bias RF signals generated are provided to the bottom electrode. Also, in various embodiments, at least one of the source RF signal and the bias RF signal may be pulsed.
- the power supply 30 may also include a DC power supply 32 coupled to the plasma processing chamber 10 in one example.
- the DC power supply 32 includes a bias DC generator 32a.
- the bias DC generator 32a is connected to the bottom electrode and configured to generate a bias DC signal.
- the generated bias DC signal is applied to the bottom electrode.
- a bias DC signal may be supplied to other electrodes, such as electrodes in an electrostatic chuck.
- the bias DC signal may be pulsed.
- the bias DC generator 32a may be provided in addition to the RF power supply 31, or may be provided instead of the second RF generator 31b.
- the antenna 14 includes one or more coils.
- antenna 14 may include an outer coil and an inner coil that are coaxially arranged.
- the RF power supply 31 may be connected to both the outer coil and the inner coil, or may be connected to either one of the outer coil and the inner coil.
- the same RF generator may be connected to both the outer and inner coils, or separate RF generators may be separately connected to the outer and inner coils.
- the exhaust system 40 may be connected to a gas exhaust port 10e provided at the bottom of the plasma processing chamber 10, for example.
- Exhaust system 40 may include a pressure regulating valve and a vacuum pump. The internal pressure of the plasma processing space 10s is adjusted by the pressure regulating valve.
- Vacuum pumps may include turbomolecular pumps, dry pumps, or combinations thereof.
- the controller 2 processes computer-executable instructions that cause the plasma processing apparatus 1 to perform the various steps described in this disclosure. Controller 2 may be configured to control elements of plasma processing apparatus 1 to perform the various processes described herein. In one embodiment, part or all of the controller 2 may be included in the plasma processing apparatus 1 .
- the control unit 2 may include, for example, a computer 2a.
- the computer 2a may include, for example, a processing unit (CPU) 2a1, a storage unit 2a2, and a communication interface 2a3.
- Processing unit 2a1 can be configured to perform various control operations based on programs stored in storage unit 2a2.
- the storage unit 2a2 may include RAM (Random Access Memory), ROM (Read Only Memory), HDD (Hard Disk Drive), SSD (Solid State Drive), or a combination thereof.
- the communication interface 2a3 may communicate with the plasma processing apparatus 1 via a communication line such as a LAN (Local Area Network).
- the plasma processing system has the inductively coupled plasma (ICP) plasma processing apparatus 1
- the configuration of the plasma processing system is limited to this. is not.
- the plasma processing system may be a Capacitively Coupled Plasma (CCP), an ECR Plasma (Electron-Cyclotron-resonance Plasma), a Helicon Wave Plasma (HWP), or a Surface Wave Plasma (HWP).
- SWP or the like may have a processing apparatus including a plasma generation unit.
- processing apparatus including various types of plasma generators may be used, including alternating current (AC) plasma generators and direct current (DC) plasma generators.
- a substrate W is provided with an etching target layer E (for example, a SiOx film), an underlying layer G (for example, a SiN film), an organic material layer M, and a mask pattern P in this order. formed from below.
- the organic material layer M has, for example, an amorphous carbon layer (Amorphous Carbon Layer: ACL).
- ACL amorphous Carbon Layer
- the substrate W is loaded into the plasma processing chamber 10 and placed on the substrate support 11 . Thereafter, by supplying a DC voltage to the electrodes in the electrostatic chuck, the substrate W is electrostatically attracted to the electrostatic chuck by Coulomb force. After loading the substrate W, the inside of the plasma processing chamber 10 is depressurized to a desired degree of vacuum by the exhaust system 40 .
- a processing gas including an etching gas for the organic material layer M is supplied from the gas supply unit 20 to the plasma processing space 10s through the central gas injection unit 13 .
- the etching gas for the organic material layer M is, for example, at least one oxygen-containing gas selected from the group consisting of CO gas, CO2 gas, O2 gas , O3 gas, COS gas and H2O gas. good.
- the process gas may contain a diluent gas such as Ar gas.
- the high-frequency power HF for plasma generation is supplied to the antenna 14 by the first RF generator 31a to excite the processing gas and generate plasma.
- the organic material layer M is etched by supplying high-frequency power LF for bias to the lower electrode from the second RF generator 31b and drawing ions into the substrate W. As shown in FIG. As shown in FIG. 2B, the organic material layer M is etched to form holes H as a mask pattern in the organic material layer M. Then, as shown in FIG. Note that the hole H formed in the organic material layer M may be expressed as a "recess" in the technology of the present disclosure.
- the bias high-frequency power LF is turned on and off at a high frequency of several hundred Hz or higher, that is, the high-frequency power LF is supplied and stopped.
- the high-frequency power LF which is the bias power
- the high-frequency power LF is turned on/off at a predetermined cycle during etching. It is supplied to the substrate support with pulses that are repeatedly turned off.
- a cycle in which a first period P1 in which the high-frequency power LF is supplied (ON) to the substrate support and a second period P2 in which the supply of the high-frequency power LF is stopped (OFF) are repeated.
- the frequency (hereinafter also referred to as "pulse frequency") that defines the is 100 Hz or less, the ratio of the time of the first period P1 to the total time of the first period P1 and the second period P2 (P1 / (P1 + P2)) is supplied to the substrate support (lower electrode).
- the high-frequency power LF may be supplied to the substrate support (lower electrode) by High-Low control as shown in FIG. 4 instead of repeating ON/OFF pulses.
- FIG. 5 is an explanatory diagram schematically showing an example of the etching treatment result according to the example.
- ⁇ (e) As an example, the respective "roundness” and “Boeing CD value (BB Bias: MAXCD value in Hall H and The bottom CD value difference)” is shown. Further, FIG.
- FIG. 6 is an explanatory diagram schematically showing an example of the etching treatment result according to the example, and (a) when the high-frequency power LF is supplied as a continuous wave as a comparative example, (b) to (d) As an example, when the high-frequency power LF is supplied as a pulse with a duty ratio of 30% to 90% and an OFF time of 50 msec (the time during which the high-frequency power LF is not supplied in the pulse wave), the respective "roundness" and "Boeing CD value" is shown.
- FIG. 6A which is a comparative example, is the same as the comparative example shown in FIG. 5A.
- FIGS. 6B to 6D it can be seen that the bowing of the holes H is suppressed regardless of the duty ratio of the high frequency power LF supplied to the lower electrode. Further, by comparing FIG. 5(e) and FIG. 6(b), it can be seen that when the duty ratio is changed under the same pulse frequency condition, bowing is improved as the duty ratio becomes smaller. . In other words, it is predicted that the bowing of the hole H tends to improve as the duty ratio of the high-frequency power LF decreases. On the other hand, as shown in FIGS. 6B to 6D, when the OFF time is fixed (50 msec in the example of FIG. 6) and the duty ratio of the high frequency power LF is increased, the ON/OFF of the high frequency power LF It can be seen that the roundness tends to improve because the pulse frequency, which is the period of , becomes smaller.
- the circularity of the bottom of the hole H can be improved, and bowing occurring in the hole H can be reduced.
- ions can be actively drawn into the holes H during the ON time of the high-frequency power LF, and the etching can proceed, and during the OFF time, the holes can be removed. It is thought that this is because the effect of attracting ions to the bottom of H is reduced and the effect of uniformly and firmly forming a polymer (reaction product of the etching gas) as a protective film on the side wall of hole H is increased.
- the polymer formed during the OFF time can protect the side wall of the hole H from etching during the ON time, thereby suppressing bowing.
- a low-frequency power LF is used as the high-frequency power LF, the number of ions reaching the bottom of the hole H with a high aspect ratio can be increased, whereby the etching at the bottom can be promoted more than conventionally.
- the supply of the high frequency power HF and the high frequency power LF from the RF power supply 31 and the supply of the processing gas from the gas supply unit 20 are stopped.
- a processing gas including an etching gas for the etching target layer E is supplied from the gas supply unit 20 to the plasma processing space 10s through the central gas injection unit 13 .
- the etching gas for the etching target layer E may be at least one gas selected from the group consisting of CF 4 , CHF 3 and O 2 , for example.
- the process gas may contain a diluent gas such as Ar gas.
- the high-frequency power HF for plasma generation is supplied to the antenna 14 by the first RF generator 31a to excite the processing gas and generate plasma.
- the substrate W is etched by the action of the generated plasma.
- the layer to be etched E and the underlying layer G are etched using the organic material layer M as a mask, and the mask pattern is transferred onto the substrate W, as shown in FIG. 2(c).
- the mask pattern (hole H) is formed appropriately for the organic material layer M, that is, in which the roundness is good and the bowing is suppressed.
- the mask pattern can be properly transferred to the layer E to be etched.
- the etching process for the etching target layer ends.
- the supply of the high-frequency power HF from the RF power supply 31 and the supply of the processing gas from the gas supply unit 20 are stopped.
- the supply of this high frequency power LF is also stopped.
- the supply of the heat transfer gas to the back surface of the substrate W is stopped, and the adsorption and holding of the substrate W by the electrostatic chuck is stopped.
- the substrate W that has undergone the etching process is then carried out of the plasma processing chamber 10 by a substrate transport mechanism (not shown), and a series of plasma processes on the substrate W is completed.
- the etching of the organic material layer M and the etching of the etching target layer E are shown to be performed by the common plasma processing apparatus 1, but each may be performed using separate plasma processing apparatuses. .
- the high-frequency power LF for bias is supplied to the lower electrode in the form of a low-frequency pulse output, so that the holes H (mask pattern) are formed appropriately.
- the roundness of the bottom of the hole H can be improved, and the side wall of the hole H can be prevented from bowing.
- the occurrence of bowing for the holes H was in a trade-off relationship.
- the pulse frequency of the high-frequency power LF is controlled to 2 Hz or more and less than 100 Hz, and the duty ratio is controlled to 20% to 90%, preferably the pulse frequency is controlled to 2 Hz to 50 Hz, and the duty ratio is controlled to 30% to 90%. By doing so, the roundness in the hole H and the bowing can be improved more appropriately.
- the hole H formed by the etching method has a circularity of 0.90 or more and a bowing CD value (BB bias) of 40 nm. It was confirmed that:
- the roundness and bowing of the hole H are improved by controlling the pulse frequency and duty ratio of the high-frequency power LF, but the control items in the etching process in the technology according to the present disclosure are It is not limited.
- the duty ratio which is the ratio of the ON time of the high-frequency power LF
- the ON/OFF cycle pulse frequency
- improved roundness
- the roundness of the hole H can be improved by increasing the OFF time while the duty ratio, which is the ratio of the ON time of the high-frequency power LF, is kept constant at 50%. It can be said that That is, the roundness of the hole H can be improved by controlling the OFF time of the high-frequency power LF supplied in a pulse form.
- high-frequency power LF is supplied to the lower electrode as a pulsed output, and the OFF time of the pulsed output is controlled to be 10 msec or more.
- the roundness of the hole H and the bowing can be improved.
- the pulse frequency and duty ratio of the high-frequency power LF may be set so that the OFF time of the pulse output is 10 msec or longer.
- the duty should be 50% or less.
- the pulse frequency of 2 Hz is selected, the duty should be 98% or less.
- the duty ratio is 20%
- the pulse frequency of the high frequency power LF should be 80 Hz or less.
- the duty ratio is 90%
- the pulse frequency of the high frequency power LF should be 10 Hz or less.
- it is preferable to control the duty ratio of the pulse output to 20% or more and 60% or less, preferably 50%.
- the high-frequency power LF is supplied to the lower electrode as a low-frequency pulse, and the reaction time between the oxygen radicals generated in the plasma processing space 10s and the organic material layer M is lengthened (reaction time It is considered that the circularity of the hole H can be improved by increasing the hardness.
- the internal pressure or internal temperature of the plasma processing chamber 10 is increased, or the oxygen-containing gas ratio in the processing gas is increased. It is considered that the circularity of the holes H can be further improved by increasing the reactivity between the oxygen radicals and the organic material layer M.
- the bias RF signal high frequency power LF
- a bias DC voltage may be applied to the bottom electrode.
- a biasing DC voltage may be applied to the lower electrode such that the substrate W is at a negative potential.
- the DC bias voltage is supplied to the lower electrode as a pulse voltage having a negative polarity.
- the pulse voltage may be a square-wave pulse, a triangular-wave pulse, an impulse, or have other voltage waveform pulses.
- the second period during which the high-frequency power LF is supplied at the second level (low level) corresponds to the OFF time in the above embodiment, and the effect of drawing ions into the bottom of the hole H is reduced.
- a polymer is formed as a protective film on the sidewalls of the .
- the first period during which the high-frequency power LF is supplied at the first level (high level) corresponds to the ON time in the above embodiment, and the polymer (protective film) formed on the side wall of the hole H causes the side wall of the hole H to While protecting the hole H, ions can be positively drawn into the hole H to proceed with the etching at the bottom.
- the etching could proceed by That is, by controlling the time of the second period to 10 milliseconds or more in the cycle including the first period and the second period, the roundness and bowing of the hole H can be improved as in the above embodiment. It can be improved.
- the pulse frequency of the high-frequency power LF is controlled to 2 Hz or more and less than 100 Hz, and the duty ratio is controlled to 20% to 90%, preferably the pulse frequency is controlled to 2 Hz to 50 Hz, and the duty ratio is controlled to 30% to 90%. By doing so, the roundness and bowing in the hole H can be improved more appropriately as in the above embodiment.
- the hole H formed by this etching method also has a roundness of 0.90 or more and a Boeing CD It was confirmed that the value (BB Bias) was 40 nm or less.
- the "duty ratio" in the case of high-low control of the high-frequency power LF in this way means the first period per cycle (first period + second time) of the high-frequency power (the high-frequency power LF shall refer to the percentage of time supplied at the first level level).
- the “pulse frequency” in the case of performing High-Low control of the high-frequency power LF as described above refers to the frequency of switching the high-frequency power between High and Low.
- the “pulse frequency” in High-Low control can be said to be the pulse frequency that defines at least one cycle of the first period and the second period.
- the case where the layer to be etched E and the underlying layer G are laminated on the substrate W has been described as an example.
- the number of laminations and the like are not limited to the above examples, and can be set as appropriate.
- REFERENCE SIGNS LIST 1 plasma processing apparatus 10 plasma processing chamber 10s plasma processing space 11 substrate support 31 RF power source G underlying layer LF high frequency power M organic material layer W substrate
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Abstract
Description
また、本開示の技術において「真円度」とは、有機材料層に形成されるホールの断面形状における最大径に対する最小径の割合(min径/MAX径)のことを言うものとする。
先ず、一実施形態にかかるプラズマ処理システムについて説明する。図1は、プラズマ処理システムの構成の概略を示す縦断面図である。
次に、以上のように構成されたプラズマ処理装置1を用いて行われる有機材料層のエッチング処理について説明する。
かかるホールHの底部における真円度を改善する手法として、従来、数百Hz以上の高周波数でバイアス用の高周波電力LFをON/OFF駆動させること、すなわち、高周波電力LFの供給と停止とを所定の周期で繰り返すことが行われているが、かかる場合、ホールHの側壁が弓なり形状となる、いわゆるボーイング(ホールHのCD値不均一)が生じるおそれがある(図3を参照)。
また図6は、実施例に係るエッチング処理結果の一例を模式的に示す説明図であって、(a)比較例として高周波電力LFを連続波で供給した場合、(b)~(d)実施例として高周波電力LFをDuty比30%~90%、OFF時間50msec(パルス波において高周波電力LFが供給されない時間)のパルスで供給した場合、におけるそれぞれの「真円度」及び「ボーイングCD値」を示したものである。なお、比較例である図6(a)は、図5(a)に示した比較例と同様のものである。
一方、図6(b)~(d)に示したように、OFF時間を固定(図6の例においては50msec)して高周波電力LFのDuty比を大きくした場合、高周波電力LFのON/OFFの周期であるパルス周波数が小さくなるため、真円度が改善する傾向にあることがわかる。
これは、バイアス用の高周波電力LFをパルス状に供給することで、当該高周波電力LFのON時間においてはホールHにイオンを積極的に引き込んでエッチングを進行させることができ、OFF時間においてはホールHの底部にイオンを引き込む作用が小さくなりホールHの側壁に保護膜としてのポリマー(エッチングガスによる反応生成物)を均一かつ強固に生成する作用が大きくなることに起因すると考えられる。換言すれば、OFF時間において形成されたポリマーにより、ON時間におけるエッチングからホールHの側壁を保護することができ、これによりボーイングの発生が抑制される。
また更に、高周波電力LFとして、低周波数のものを用いれば、高アスペクト比のホールHの底部に到達するイオンを増加させることができ、これにより当該底部におけるエッチングを従来と比較して促進できる。
有機材料層Mのエッチングによりマスクパターンが形成されると、RF電源31からの高周波電力HF及び高周波電力LFの供給、及びガス供給部20による処理ガスの供給を停止する。
そして、このようにバイアスDC生成部32aから直流電圧を下部電極に供給する場合であっても、当該直流電圧を10ミリ秒のOFF期間を持つようにパルス化することにより、ホールHの真円度の悪化を抑制できると共に、ホールHの側壁にボーイングが生じることを適切に抑制できる。
本実施形態では、第2のレベル(Lowレベル)で高周波電力LFを供給する第2の期間が上記実施形態におけるOFF時間に相当し、ホールHの底部にイオンを引き込む作用が小さくなり、ホールHの側壁に保護膜としてのポリマーを形成する。
また、第1のレベル(Highレベル)で高周波電力LFを供給する第1の期間が上記実施形態におけるON時間に相当し、ホールHの側壁に形成されたポリマー(保護膜)によりホールHの側壁を保護しつつ、同ホールHにイオンを積極的に引き込んで底部でのエッチングを進行できる。
すなわち、第1の期間と第2の期間を含む周期のうち、第2の期間の時間を10ミリ秒以上に制御することで、上記実施形態と同様にホールHの真円度、及びボーイングを改善できる。
またこの時、高周波電力LFのパルス周波数を2Hz以上100Hz未満、かつDuty比を20%以上90%以下に制御、望ましくはパルス周波数を2Hz以上50Hz以下、Duty比を30%以上90%以下に制御することで、上記実施形態と同様に、更に適切にホールHにおける真円度、及びボーイングを改善できる。
また、このように高周波電力LFをHigh-Low制御する場合における「パルス周波数」とは、高周波電力をHigh-Low切替する切替頻度を言うものとする。換言すれば、High-Low制御する場合における「パルス周波数」とは、第1の期間及び第2の期間のうち少なくともいずれかの周期を規定するパルス周波数と言える。
10 プラズマ処理チャンバ
10s プラズマ処理空間
11 基板支持体
31 RF電源
G 下地層
LF 高周波電力
M 有機材料層
W 基板
Claims (19)
- 基板処理装置を用いて行われる基板のエッチング方法であって、
前記基板処理装置は、
前記基板の処理空間を形成する処理チャンバと、
前記処理チャンバの内部に設けられ、前記基板を保持する基板支持体と、
少なくとも前記基板支持体にバイアス電力を供給する電源と、を備え、
前記エッチング方法は、
(a)下地層と、前記下地層上の有機材料層と、を有する前記基板を前記基板支持体の上に提供する工程と、
(b)前記処理チャンバの内でプラズマを生成する工程と、
(c)前記基板支持体に対するバイアス電力の供給と停止とを所定の周期で繰り返す工程と、
を含み、前記(c)工程において、前記周期のうち前記バイアス電力が供給されないOFF時間を10ミリ秒以上とする、エッチング方法。 - 前記周期を規定する周波数が、2Hz以上100Hz未満である、請求項1に記載のエッチング方法。
- 前記周期を規定する周波数が、2Hz以上50Hz以下である、請求項2に記載のエッチング方法。
- 前記バイアス電力のDuty比が20%以上90%以下に設定される、請求項1~3のいずれか一項に記載のエッチング方法。
- 前記Duty比は、前記OFF時間を一定とし、前記周期のうち前記バイアス電力を供給するON時間を変更することにより調整する、請求項4に記載のエッチング方法。
- 前記バイアス電力が高周波電力である、請求項1~5のいずれか一項に記載のエッチング方法。
- 前記バイアス電力が直流電力である、請求項1~5のいずれか一項に記載のエッチング方法。
- 前記処理空間の雰囲気圧力、雰囲気温度、又は処理ガス中における酸素含有ガス比率のうち少なくともいずれかを更に制御する、請求項1~7のいずれか一項に記載のエッチング方法。
- 前記有機材料層がアモルファスカーボン膜を含む、請求項1~8のいずれか一項に記載のエッチング方法。
- 基板のエッチング方法であって、
(a)処理チャンバ内の基板支持体上に、下地層と、前記下地層上の有機材料層と、を有する基板を提供する工程と、
(b)酸素含有ガスを含む処理ガスから生成したプラズマを用いて、前記有機材料層に凹部を形成する工程と、
を含み、前記(b)工程において、
(b1)前記基板支持体に第1のレベルでバイアス電力を供給することで、前記有機材料層をエッチングする第1の期間と、
(b2)前記基板支持体に前記バイアス電力を供給しない、又は前記基板支持体に前記第1のレベルよりも低い第2のレベルで前記バイアス電力を供給することで、前記凹部の側壁に保護膜を形成する第2の期間と、
を繰り返す、エッチング方法。 - 前記第1の期間において、前記保護膜により前記凹部の側壁を保護しつつ、前記凹部の底部をエッチングする、請求項10に記載のエッチング方法。
- 前記第2の期間は10ミリ秒以上である、請求項10又は11に記載のエッチング方法。
- 前記第2の期間が10ミリ秒以上となるように、前記第1の期間の周期を規定する周波数、及び前記第1の期間と前記第2の期間の合計に対して前記第1の期間の占める割合、の少なくともいずれか一方を制御する、請求項10又は11に記載のエッチング方法。
- 前記第1の期間の周期を規定する周波数は2Hz以上100Hz未満である、請求項10~13のいずれか一項に記載のエッチング方法。
- 前記第1の期間と前記第2の期間の合計時間に対して前記第1の期間の占める割合は、20%以上90%以下である、請求項10~14のいずれか一項に記載のエッチング方法。
- 前記酸素含有ガスは、COガス、CO2ガス、O2ガス、O3ガス、COSガス及びH2Oガスからなる群から選択される少なくとも1種のガスを含む、請求項10~15のいずれか一項に記載のエッチング方法。
- 前記処理ガスは不活性ガスをさらに含む、請求項10~16のいずれか一項に記載のエッチング方法。
- 前記(b2)工程において前記有機材料層に形成された前記凹部は、真円度が0.90以上であり、かつ、ボーイングCD値が40nm以下である、請求項10~17のいずれか一項に記載のエッチング方法。
- 処理チャンバと、
前記処理チャンバ内に設けられる基板支持体と、
プラズマ生成部と、
制御部と、を備え、
前記制御部は、
(a)前記処理チャンバ内の前記基板支持体上に、下地層と、前記下地層上の有機材料層と、を有する基板を提供する制御と、
(b)酸素含有ガスを含む処理ガスから生成したプラズマを用いて、前記有機材料層に凹部を形成する制御と、
を実行し、前記(b)工程において、
(b1)前記基板支持体に第1のレベルでバイアス電力を供給することで、前記有機材料層をエッチングする制御と、
(b2)前記基板支持体に前記バイアス電力を供給しない、又は前記基板支持体に前記第1のレベルよりも低い第2のレベルで前記バイアス電力を供給することで、前記凹部の側壁に保護膜を形成する制御と、
を繰り返し実行する、エッチング装置。
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JP2001244250A (ja) * | 2000-03-01 | 2001-09-07 | Hitachi Ltd | 表面処理方法および装置 |
JP2016028424A (ja) * | 2014-07-10 | 2016-02-25 | 東京エレクトロン株式会社 | 基板の高精度エッチング方法 |
WO2016170986A1 (ja) * | 2015-04-20 | 2016-10-27 | 東京エレクトロン株式会社 | 被エッチング層をエッチングする方法 |
JP2017011255A (ja) * | 2015-06-23 | 2017-01-12 | 東京エレクトロン株式会社 | エッチング処理方法及びプラズマ処理装置 |
WO2020037331A1 (en) * | 2018-08-14 | 2020-02-20 | Tokyo Electron Limited | Systems and methods of control for plasma processing |
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TW202303747A (zh) | 2023-01-16 |
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US20240006152A1 (en) | 2024-01-04 |
KR20230161474A (ko) | 2023-11-27 |
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