WO2016181893A1 - クリーニング方法及びプラズマ処理方法 - Google Patents
クリーニング方法及びプラズマ処理方法 Download PDFInfo
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- WO2016181893A1 WO2016181893A1 PCT/JP2016/063605 JP2016063605W WO2016181893A1 WO 2016181893 A1 WO2016181893 A1 WO 2016181893A1 JP 2016063605 W JP2016063605 W JP 2016063605W WO 2016181893 A1 WO2016181893 A1 WO 2016181893A1
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- Prior art keywords
- gas
- cleaning
- cleaning step
- metal
- etching
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- H01F10/3272—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer the exchange coupling being asymmetric, e.g. by use of additional pinning, by using antiferromagnetic or ferromagnetic coupling interface, i.e. so-called spin-valve [SV] structure, e.g. NiFe/Cu/NiFe/FeMn by use of anti-parallel coupled [APC] ferromagnetic layers, e.g. artificial ferrimagnets [AFI], artificial [AAF] or synthetic [SAF] anti-ferromagnets
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- H01J2237/33—Processing objects by plasma generation characterised by the type of processing
- H01J2237/335—Cleaning
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Definitions
- the present invention relates to a cleaning method and a plasma processing method.
- an object of one aspect of the present invention is to provide a cleaning method for effectively removing a plurality of types of deposits.
- a method for cleaning a substrate processing apparatus for etching a film containing a metal wherein a carbon-containing deposit is formed by plasma generated from a gas containing a hydrogen-containing gas.
- the second cleaning step to remove the metal-containing deposits by the plasma generated from the inert gas after the first cleaning step, and after the second cleaning step,
- the figure for demonstrating an example of particle generation. 6 is a flowchart illustrating an example of a cleaning process according to an embodiment.
- variation prevention result of the etching rate by the cleaning concerning one Embodiment The figure which shows an example of the measurement result of the emitted light intensity at the time of the etching which concerns on one Embodiment, and cleaning. The figure which shows an example of the measurement result of the emitted light intensity at the time of the etching which concerns on one Embodiment, and cleaning. The figure which shows an example of the optimal value of the cleaning time which concerns on one Embodiment.
- FIG. 1 shows an example of a longitudinal section of an etching apparatus 1 according to this embodiment.
- the etching apparatus 1 according to the present embodiment is a parallel plate type plasma processing apparatus (capacitively coupled plasma processing apparatus) in which a mounting table 20 and a gas shower head 25 are disposed in a processing container 10 so as to face each other.
- the mounting table 20 has a function of holding a semiconductor wafer (hereinafter simply referred to as “wafer W”) and also functions as a lower electrode.
- the gas shower head 25 has a function of supplying gas into the processing vessel 10 in a shower shape and also functions as an upper electrode.
- the processing container 10 is made of aluminum having an anodized surface (anodized), for example, and has a cylindrical shape.
- the processing container 10 is electrically grounded.
- the mounting table 20 is installed at the bottom of the processing container 10 and mounts the wafer W thereon.
- the wafer W is an example of a substrate to be etched, and a metal laminated film of MRAM elements is formed on the wafer W.
- the mounting table 20 is made of, for example, aluminum (Al), titanium (Ti), silicon carbide (SiC), or the like.
- An electrostatic chuck 106 for electrostatically attracting the substrate is provided on the upper surface of the mounting table 20.
- the electrostatic chuck 106 has a structure in which a chuck electrode 106a is sandwiched between insulators 106b.
- a DC voltage source 112 is connected to the chuck electrode 106a, and a DC current is supplied from the DC voltage source 112 to the chuck electrode 106a. As a result, the wafer W is attracted to the electrostatic chuck 106 by the Coulomb force.
- An annular focus ring 103 is placed on the electrostatic chuck 106 so as to surround the periphery of the wafer W.
- the focus ring 103 is made of a conductive member, for example, silicon, and converges plasma toward the surface of the wafer W inside the processing container 10 to improve etching efficiency.
- the mounting table 20 is supported by the support body 104.
- a coolant channel 104 a is formed inside the support body 104.
- a refrigerant inlet pipe 104b and a refrigerant outlet pipe 104c are connected to the refrigerant flow path 104a.
- a cooling medium such as cooling water or brine output from the chiller 107 circulates through the refrigerant inlet pipe 104b, the refrigerant flow path 104a, and the refrigerant outlet pipe 104c. Thereby, the mounting table 20 and the electrostatic chuck 106 are cooled.
- the heat transfer gas supply source 85 supplies a heat transfer gas such as helium gas (He) or argon gas (Ar) to the back surface of the wafer W on the electrostatic chuck 106 through the gas supply line 130.
- a heat transfer gas such as helium gas (He) or argon gas (Ar)
- He helium gas
- Ar argon gas
- the temperature of the electrostatic chuck 106 is controlled by the cooling medium circulated through the refrigerant flow path 104a and the heat transfer gas supplied to the back surface of the wafer W.
- the substrate can be controlled to a predetermined temperature.
- the first high frequency power supply 34 is electrically connected to the gas shower head 25 via the matching unit 35.
- the first high frequency power supply 34 applies, for example, a high frequency power HF for plasma excitation of 60 MHz to the gas shower head 25.
- the high frequency power HF is applied to the gas shower head 25, but may be applied to the mounting table 20.
- the second high frequency power supply 32 is electrically connected to the mounting table 20 via the matching unit 33.
- the second high frequency power supply 32 applies a high frequency power LF for bias of 13.56 MHz to the mounting table 20.
- the matching unit 35 matches the load impedance to the internal (or output) impedance of the first high frequency power supply 34.
- the matching unit 33 matches the load impedance to the internal (or output) impedance of the second high-frequency power source 32.
- the matching unit 35 and the matching unit 33 function so that the internal impedance and the load impedance of the first high-frequency power source 34 and the second high-frequency power source 32 seem to coincide when plasma is generated in the processing container 10.
- the gas shower head 25 includes a ceiling electrode plate 41 having a large number of gas supply holes 55 and a cooling plate 42 that supports the ceiling electrode plate 41 in a detachable manner.
- the gas shower head 25 is attached so as to close the opening of the ceiling portion of the processing container 10 through a shield ring 40 covering the peripheral edge portion thereof.
- the gas shower head 25 is formed with a gas inlet 45 for introducing gas.
- the gas output from the gas supply source 15 is supplied to the diffusion chambers 50a and 50b via the gas introduction port 45, diffused in the respective diffusion chambers 50a and 50b, and then transferred from the multiple gas supply holes 55 to the mounting table 20. Introduced towards.
- An exhaust port 60 is formed on the bottom surface of the processing container 10, and the inside of the processing container 10 is exhausted by an exhaust device 65 connected to the exhaust port 60. Thereby, the inside of the processing container 10 can be maintained at a predetermined degree of vacuum.
- a gate valve G is provided on the side wall of the processing vessel 10. By opening and closing the gate valve G, the wafer W is carried in and out of the processing container 10.
- the etching apparatus 1 is provided with a light emission sensor 108 capable of measuring the intensity of light of each wavelength in the plasma in the processing container 10 through the quartz window 109.
- the etching apparatus 1 is provided with a control unit 100 that controls the operation of the entire apparatus.
- the control unit 100 includes a CPU (Central Processing Unit) 105, a ROM (Read Only Memory) 110, and a RAM (Random Access Memory) 115.
- the CPU 105 executes desired processing such as etching processing and charge removal processing according to various recipes stored in these storage areas.
- the recipe includes process time, pressure (gas exhaust), high-frequency power and voltage, various gas flow rates, process vessel 10 temperature (upper electrode temperature, process vessel side wall temperature, electrostatic chuck) which are control information of the apparatus with respect to process conditions. Temperature), the temperature of the chiller 107, and the like.
- recipes indicating these programs and processing conditions may be stored in a hard disk or a semiconductor memory. Further, the recipe may be set at a predetermined position in the storage area while being stored in a storage medium readable by a portable computer such as a CD-ROM or DVD.
- control unit 100 measures the emission spectrum of each wavelength based on the detection value detected by the light emission sensor 108, and detects the end point of each cleaning process described later.
- the opening and closing of the gate valve G is controlled, and the wafer W is loaded into the processing container 10 and mounted on the mounting table 20.
- a DC current is supplied from the DC voltage source 112 to the chuck electrode 106a, the wafer W is attracted to and held by the electrostatic chuck 106 by the Coulomb force.
- an etching gas, a high frequency power HF for plasma excitation, and a high frequency power LF for bias are supplied into the processing container 10 to generate plasma.
- Plasma etching is performed on the wafer W by the generated plasma.
- the DC voltage HV is applied to the chuck electrode 106a from the DC voltage source 112 to reverse the positive and negative DC voltage HV to remove the charge on the wafer W, and the wafer W is peeled off from the electrostatic chuck 106.
- the opening and closing of the gate valve G is controlled, and the wafer W is unloaded from the processing container 10.
- the etching apparatus 1 performs the cleaning after etching the MRAM elements on the wafer W in a plurality of cleaning processes in order, and sequentially deposits metal, carbon, silicon deposited in the processing container 10 at the time of etching. Is efficiently removed.
- the MRAM element is formed from a multilayer film including a metal laminated film.
- the metal laminated film include cobalt (Co), iron (Fe), nickel (Ni), boron (B), palladium (Pd), platinum (Pt), manganese (Mn), zirconium (Zr), iridium ( Ir), ruthenium (Ru), tantalum (Ta), chromium (Cr), magnesium (Mg), titanium (Ti), tungsten (W), aluminum (Al), copper (Cu), gold (Au), silver ( Ag) and the like may be included.
- an oxide or nitride containing any of the above metals may be included.
- FIG. 2 shows an example of a cross section of the MRAM element 2.
- the MRAM element 2 is disposed on a silicon wafer W, and in order from the bottom, the lower electrode layer 3, the pinning layer 4, the second magnetic layer 5, the insulating layer 6, the first magnetic layer 7, the upper electrode layer 8, And the mask 9 is laminated
- a protective film 11 is provided on the side walls of the first magnetic layer 7, the upper electrode layer 8, and the mask 9 of the MRAM element 2.
- the laminated film of the second magnetic layer 5, the insulating layer 6, and the first magnetic layer 7 is also referred to as a metal laminated film 12.
- the lower electrode layer 3 is an electrode member having electrical conductivity formed on the substrate.
- the thickness of the lower electrode layer 3 is, for example, about 5 nm.
- the pinning layer 4 is disposed between the lower electrode layer 3 and the second magnetic layer 5.
- the pinned layer 4 fixes the magnetization direction of the lower electrode layer 3 by the pinning effect by the antiferromagnetic material.
- an antiferromagnetic material such as IrMn (iridium manganese) or PtMn (platinum manganese) is used, and the thickness thereof is, for example, about 7 nm.
- the second magnetic layer 5 is a layer including a ferromagnetic material disposed on the pinned layer 4.
- the second magnetic layer 5 functions as a so-called pinned layer in which the magnetization direction is kept constant without being influenced by the external magnetic field due to the pinning effect of the pinning layer 4.
- CoFeB is used, and the thickness thereof is, for example, about 2.5 nm.
- the insulating layer 6 is sandwiched between the second magnetic layer 5 and the first magnetic layer 7 to form a magnetic tunnel junction (MTJ).
- MTJ magnetic tunnel junction
- the insulating layer 6 is interposed between the second magnetic layer 5 and the first magnetic layer 7, so that the tunnel magnetic field is generated between the second magnetic layer 5 and the first magnetic layer 7.
- a resistance effect (TMR: Tunnel magnetoresistance) occurs.
- TMR Tunnel magnetoresistance
- the electric power according to the relative relationship (parallel or antiparallel) between the magnetization direction of the second magnetic layer 5 and the magnetization direction of the first magnetic layer 7. Resistance occurs.
- Al 2 O 3 or MgO is used, and the thickness thereof is, for example, 1.3 nm.
- the first magnetic layer 7 is a layer including a ferromagnetic material disposed on the insulating layer 6.
- the first magnetic layer 7 functions as a so-called free layer in which the direction of magnetization follows an external magnetic field that is magnetic information.
- CoFeB is used, and the thickness thereof is, for example, about 2.5 nm.
- the upper electrode layer 8 is an electrode member having electrical conductivity formed on the first magnetic layer 7.
- the thickness of the upper electrode layer 8 is about 5 nm, for example.
- the mask 9 is formed on the upper electrode layer 8.
- the mask 9 is formed in a shape corresponding to the planar shape of the MRAM element 2.
- metal such as magnesium (Mg) contained in the metal film
- C carbon
- Different types of deposits such as silicon (Si) deposits are generated by etching the silicon wafer W under the metal film or the parts in the processing vessel containing silicon.
- Si silicon
- the ceiling surface A becomes a micromask and falls onto the wafer W as particles larger than usual, for example, about 100 microns.
- the cleaning method according to the present embodiment removes the metal-containing deposit, the carbon-containing deposit, and the silicon-containing deposit using plasma generated from a specific gas suitable for each of the cleaning steps. This makes it possible to remove the components of metal-containing deposits, carbon-containing deposits, and silicon-containing deposits separately, stabilize the etching rate during long-term operation, suppress the generation of particles, and increase the life of parts. Can be extended.
- the cleaning method according to the present embodiment will be described with reference to the flowchart of FIG.
- the MRAM is etched in steps S10 to S14 before the main cleaning.
- a product wafer W is loaded in step S10
- plasma etching is performed on the wafer W with an etching gas containing a hydrocarbon gas in step S12
- the etched wafer W is unloaded in step S14.
- the cleaning method according to the present embodiment is used for cleaning the etching apparatus 1 after etching is performed on one or a plurality of product wafers W.
- Step S16 a dummy wafer is loaded in step S16.
- step S ⁇ b > 18 a gas containing nitrogen (N 2 ) gas and hydrogen (H 2 ) gas is supplied into the processing container 10 to generate plasma mainly composed of nitrogen gas and hydrogen gas.
- Carbon-containing deposits can be removed mainly by the action of hydrogen radicals in the generated plasma.
- this step is an example of a first cleaning step in which a gas containing a hydrogen-containing gas is supplied, and carbon-containing deposits are removed by plasma generated from the gas containing the hydrogen-containing gas.
- a gas containing a hydrogen-containing gas and a nitrogen-containing gas may be supplied.
- nitrogen gas, hydrogen gas, and argon gas (Ar) may be supplied.
- a gas containing oxygen (O 2 ) gas and fluorine (F) gas is not supplied. This is to prevent the metal-containing deposit to be removed in the next step from being oxidized and fluorinated by a gas containing oxygen gas and fluorine gas.
- the control unit 100 determines the CN (nitrogen carbide) of 387 nm based on the detection value of the luminescence sensor 108. ) And the first end point detection is performed, and then the process proceeds to the next cleaning step.
- End point detection is performed by measuring the light intensity of each wavelength in the plasma using the light emission sensor 108 attached to the etching apparatus 1.
- the control unit 100 detects the emission intensity of carbon nitride (387 nm) generated by the reaction between the carbon-containing deposit and the nitrogen component contained in the plasma from the measured emission spectrum in the plasma in the processing container 10.
- the control unit 100 determines that the first end point is detected when the slope of the emission intensity of carbon nitride with respect to time becomes zero.
- FIG. 6 shows the result of the first end point detection for seven dummy wafers.
- the horizontal axis of the graph in FIG. 6 represents time, and the vertical axis represents the emission intensity of carbon nitride (387 nm).
- control unit 100 determines that the first end point detection is when the slope of the emission intensity of carbon nitride with respect to time is substantially 0, so that the cleaning time is actually set to the carbon-containing deposit. It can be optimized for almost complete removal time. As a result, the carbon-containing deposit can be removed almost completely and then the next second cleaning step can be performed.
- step S ⁇ b> 22 the second cleaning process is performed.
- argon gas is supplied into the processing container 10
- metal-containing deposits are knocked out by the action of ion sputtering mainly of argon gas plasma, and are removed to the outside of the processing container 10.
- this step is an example of a second cleaning step in which an inert gas is supplied after the first cleaning step, and the metal-containing deposit is removed by plasma generated from the inert gas.
- argon gas is supplied as the gas for the second cleaning step.
- the gas supplied in the second cleaning step is not limited to this, but helium (He), krypton (Kr), xenon ( Other inert gases such as Xe) may be used.
- a gas containing oxygen gas and fluorine gas is not supplied. This is to prevent the metal-containing deposit from being oxidized and fluorinated by a gas containing oxygen gas and fluorine gas.
- the control unit 100 detects the light emission intensity of the metal-containing deposit sputtered by the argon gas plasma from the light emission spectrum in the plasma in the processing container 10 measured by the light emission sensor 108.
- the metal-containing deposit to be measured may include platinum (Pt), magnesium (Mg), tantalum (Ta), cobalt (Co), and ruthenium (Ru).
- the metal-containing deposits to be measured include cobalt (Co), iron (Fe), boron (B), palladium (Pd), platinum (Pt), manganese (Mn), iridium (Ir) contained in the MRAM element 2.
- tantalum (Ta) of the base film may be included.
- the tantalum deposit is generated, for example, when the base film made of tantalum (Ta) included in the MRAM element 2 is over-etched.
- the control unit 100 determines that the second end point is detected when the slope of the emission intensity of these metal-containing deposits with respect to time becomes zero.
- FIG. 7 shows the result of the second end point detection for seven dummy wafers.
- the second end point detection target in FIG. 7 is 266 nm platinum (Pt) in “b-1” in FIG. 7, 285 nm magnesium (Mg) and tantalum (Ta) in “b-2”, “b-2”.
- control unit 100 determines that the second end point detection is when the inclination of the light emission intensity of the predetermined metal with respect to time is substantially 0, so that the cleaning time is actually set to the metal-containing deposit. Can be optimized for the time to remove almost completely. Thereby, it is possible to shift to the next third cleaning step after the metal-containing deposit is almost completely removed.
- step S24 when the control unit 100 detects the second end point in step S24, a dummy wafer is unloaded in step S26, and another dummy wafer is loaded in step S28.
- step S26 the reaction products of carbon and metal that have fallen from the ceiling due to sputtering and deposited on the dummy wafer during the second cleaning step are quickly discharged out of the processing container. be able to.
- the next third cleaning step for removing the silicon-containing deposits such as SiO 2 and SiC shown in “c” of FIG. 5 is started.
- the dummy wafer replacement process in steps S26 and S28 can be omitted. Further, after the dummy wafer is taken out in step S26, the process of loading a new dummy wafer in step S28 may be omitted.
- a gas containing carbon tetrafluoride (CF 4 ) gas and oxygen gas is supplied into the processing container 10 to generate plasma mainly composed of carbon tetrafluoride gas and oxygen gas.
- Deposits of silicon are removed mainly by the action of fluorine radicals in the generated plasma.
- a gas containing a fluorine-containing gas and an oxygen-containing gas is supplied, and silicon-containing deposits are removed by plasma generated from the gas containing the fluorine-containing gas and the oxygen-containing gas. This is an example of a third cleaning step.
- fluorine gas (F 2 ), nitrogen trifluoride gas (NF 3 ), and sulfur hexafluoride gas (SF 6 ) may be supplied as another example of the fluorine-containing gas. Further, an inert gas may be introduced together with the fluorine-containing gas and the oxygen-containing gas.
- the control unit 100 measures the emission intensity of silicon and performs third end point detection.
- FIG. 8 shows an example of the result of the third end point detection for seven dummy wafers.
- the control unit 100 determines that the third end point is detected when the slope of the emission intensity of silicon with respect to time becomes zero. Since the third end point detection is performed for each third cleaning step, the cleaning time is optimized to a time during which the silicon-containing deposit can actually be completely removed. Thereby, the silicon-containing deposit can be completely removed.
- step S ⁇ b> 34 a gas containing nitrogen gas and hydrogen gas is supplied, and the fluorine-containing gas generated in the third cleaning process and The oxygen-containing gas is removed from the processing container (seasoning step). Thereby, the atmosphere in the processing container is adjusted, and the present processing is terminated.
- a gas containing a hydrogen-containing gas may be supplied.
- nitrogen gas, hydrogen gas, and argon gas (Ar) may be supplied.
- the gas to be supplied contains a hydrogen-containing gas, the nitrogen-containing gas may not be contained.
- a gas containing a hydrogen-containing gas is supplied, and a fluorine-containing gas and an oxygen-containing gas are removed by plasma generated from the gas containing the hydrogen-containing gas. It is an example of a cleaning process.
- FIG. 9 shows an example of the result of executing the etching of the MRAM element 2 in the etching apparatus 1 after performing cleaning and seasoning using the cleaning method according to the present embodiment.
- FIG. 9 shows a temporal change in the emission spectrum in the plasma of platinum (Pt: 266 nm) when the MRAM element 2 is etched.
- FIG. 9 shows that there is no variation in the peak of the emission spectrum in the etching of the seven product wafers, that is, the time during which the platinum layer (Pt) of the MRAM element 2 is etched in the seven product wafers. Has been.
- the variation in the etching rate can be prevented by the cleaning method according to the present embodiment.
- FIG. 10 shows an example of an emission spectrum measured when the MRAM element 2 is etched.
- FIG. 11 shows an example of an emission spectrum measured when the MRAM element 2 is cleaned.
- a specific gas is supplied for each cleaning process and cleaning is performed with a specific plasma. Further, end point detection based on the emission spectrum is performed for each cleaning process. As a result, it is possible to sequentially remove a plurality of different types of laminated films generated when etching is performed.
- a mass gas analyzer or a secondary ion mass spectrometer (SIMS) meter may be used, or an analyzer based on the same ion detection principle as these measuring instruments may be used.
- SIMS secondary ion mass spectrometer
- the cleaning method according to the present embodiment carbon, metal, and silicon-containing deposits in the processing container 10 after etching the metal film of the MRAM element can be efficiently removed.
- the micromask generated by the metal component and carbon component remaining on the parts in the processing container can be eliminated, the roughness of the surface of the part and the generation of particles are effectively suppressed, and the life of the part Can be extended.
- the cleaning method according to the present embodiment after the etching of one or more product wafers, the carbon, metal, and silicon components are efficiently removed by separately cleaning with different cleaning gases. it can. For this reason, an etching rate does not fluctuate and it is possible to maintain a stable etching condition in a long-term operation.
- the control unit 100 executes end point detection based on the emission spectrum
- the optimum value of the cleaning time can be calculated according to the detection value of the light emission sensor 108.
- automatic cleaning time control can be performed based on the first to third end point detection times.
- FIG. 12 shows an example of emission spectra of silicon (Si: 252 nm), platinum (Pt: 266 nm), magnesium (Mg: 285 nm), cobalt (Co: 345 nm), and ruthenium (Ru: 373 nm).
- the control unit 100 calculates 800 seconds at which the slopes of all the emission intensities of silicon and the above metals with respect to time are almost zero as the optimum cleaning time, and performs cleaning in the second and third cleaning steps. Control time to 800 seconds. Thereby, automatic control of the cleaning time can be performed.
- the cleaning method and the plasma processing method for performing plasma processing including the cleaning method have been described in the above embodiment.
- the cleaning method and the plasma processing method according to the present invention are not limited to the above embodiment.
- Various modifications and improvements can be made within the range described above. The matters described in the above embodiments can be combined within a consistent range.
- the etching target film is not limited to MRAM, and may be a film containing metal or a multilayer film material containing a metal film.
- the first to fourth cleaning steps are performed.
- the cleaning method according to the present invention is not limited to this, and the first and second cleaning steps may be performed, and the third and fourth cleaning steps may not be performed.
- an inert gas is supplied after the first cleaning step of cleaning the carbon-containing deposits with plasma generated from a gas containing a hydrogen-containing gas, and the generated gas is generated from the inert gas.
- carbon-containing deposits are removed mainly by the chemical action of hydrogen radicals in the plasma.
- the metal-containing deposit is physically knocked out mainly by sputtering of argon ions in the plasma, and is discharged out of the processing vessel 10. In this way, different types of deposits can be almost completely removed in order, thereby preventing variation in etching rate and generation of particles. The life of parts can be extended.
- the etching apparatus according to the present embodiment is an example of a substrate processing apparatus according to the present invention.
- CCP capacitively coupled plasma
- other substrate processing apparatuses can be applied to the substrate processing apparatus according to the present invention.
- Other substrate processing equipment includes inductively coupled plasma (ICP), plasma processing equipment using a radial line slot antenna, helicon wave excited plasma (HWP) equipment, electron cyclotron resonance plasma ( ECR: Electron Cyclotron Resonance Plasma) device.
- ICP inductively coupled plasma
- HWP helicon wave excited plasma
- ECR Electron Cyclotron Resonance Plasma
- the substrate processed by the substrate processing apparatus according to the present invention is not limited to a wafer, and may be, for example, a large substrate for a flat panel display, an EL element, or a substrate for a solar cell.
- Examples of the carbon-containing gas used as an etching gas for the MRAM element 2 include methane (CH 4 ), ethylene (C 2 H 4 ), carbon tetrafluoride (CF 4 ), carbonyl fluoride (COF 2 ), carbon monoxide (CO), methanol (CH 3 OH), ethanol (C 2 H 5 OH, acetylacetone (C 5 H 8 O 2) , hexafluoroacetylacetone (C 5 H 2 F 6 O2 ), acetic acid (CH 3 COOH ), Pyridine (C 5 H 5 N), and / or formic acid (HCOOH), but is not limited thereto.
- Etching apparatus 2 MRAM element 3: Lower electrode layer 4: Pinning layer 5: Second magnetic layer 6: Insulating layer 7: First magnetic layer 8: Upper electrode layer 9: Mask 10: Processing vessel 12: Metal stack Film 15: Gas supply source 20: Mounting table 25: Gas shower head 32: Second high frequency power supply 34: First high frequency power supply 100: Control unit 103: Focus ring 106: Electrostatic chuck 108: Light emission sensor Dp: Deposit W: Silicon substrate
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Abstract
Description
まず、本発明の一実施形態に係るエッチング装置1について、図1を参照して説明する。図1は、本実施形態に係るエッチング装置1の縦断面の一例を示す。本実施形態に係るエッチング装置1は、処理容器10内に載置台20とガスシャワーヘッド25とを対向配置した平行平板型のプラズマ処理装置(容量結合型プラズマ処理装置)である。載置台20は、半導体ウェハ(以下、単に「ウェハW」という。)を保持する機能を有するとともに下部電極として機能する。ガスシャワーヘッド25は、ガスを処理容器10内にシャワー状に供給する機能を有するとともに上部電極として機能する。
本実施形態に係るエッチング装置1は、ウェハW上のMRAM素子をエッチングした後のクリーニングを複数のクリーニング工程に分けて順に実行することでエッチング時に処理容器10の内部に堆積した金属、カーボン、シリコンが含有された反応生成物を効率よく除去する。
本実施形態にかかるクリーニング方法について、図4のフローチャートを参照しながら説明する。前提として本クリーニングの前にステップS10~S14においてMRAMのエッチングが実行される。具体的には、ステップS10において製品用のウェハWが搬入され、ステップS12において炭化水素ガスを含むエッチングガスによりウェハWに対してプラズマエッチングが実行され、ステップS14においてエッチング後のウェハWが搬出される。本実施形態にかかるクリーニング方法は、1枚又は複数枚の製品用のウェハWに対してエッチングが実行された後のエッチング装置1のクリーニングに使用される。
クリーニング工程では、まず、ステップS16にてダミーウェハが搬入される。次に、ステップS18にて、処理容器10内に窒素(N2)ガス及び水素(H2)ガスを含むガスを供給し、窒素ガス及び水素ガスを主としたプラズマが生成される。生成したプラズマのうちの主に水素ラジカルの作用によりカーボン含有堆積物を除去することができる。なお、本工程は、水素含有ガスを含むガスを供給し、水素含有ガスを含むガスから生成されたプラズマによりカーボン含有堆積物を除去する第1のクリーニング工程の一例である。
図4に戻り、ステップS20において制御部100が第1の終点を検出した場合、ステップS22に進み、第2のクリーニング工程が実行される。第2のクリーニング工程において処理容器10内にはアルゴンガスが供給され、アルゴンガスのプラズマの主にイオンのスパッタの作用により金属含有堆積物がたたき出され、処理容器10外に除去される。なお、本工程は、第1のクリーニング工程の後に、不活性ガスを供給し、不活性ガスから生成されたプラズマにより金属含有堆積物を除去する第2のクリーニング工程の一例である。
図4に戻り、ステップS30に進み、第3のクリーニング工程が実行される。第3のクリーニング工程では、処理容器10内に四フッ化炭素(CF4)ガス及び酸素ガスを含むガスが供給され、四フッ化炭素ガス及び酸素ガスを主としたプラズマが生成される。生成したプラズマのうちの主にフッ素系ラジカルの作用によりシリコン(シリコン酸化膜を含む)の堆積物が除去される。なお、本工程は、第2のクリーニング工程の後に、フッ素含有ガス及び酸素含有ガスを含むガスを供給し、フッ素含有ガス及び酸素含有ガスを含むガスから生成されたプラズマによりシリコン含有堆積物を除去する第3のクリーニング工程の一例である。
図4に戻り、ステップS32において制御部100が第3の終点を検出した場合、ステップS34に進み、窒素ガス及び水素ガスを含むガスを供給し、第3のクリーニング工程で発生したフッ素含有ガス及び酸素含有ガスを処理容器外に除去する(シーズニング工程)。これにより、処理容器内の雰囲気を整え、本処理を終了する。
2:MRAM素子
3:下部電極層
4:ピン止め層
5:第2磁性層
6:絶縁層
7:第1磁性層
8:上部電極層
9:マスク
10:処理容器
12:金属積層膜
15:ガス供給源
20:載置台
25:ガスシャワーヘッド
32:第2高周波電源
34:第1高周波電源
100:制御部
103:フォーカスリング
106:静電チャック
108:発光センサ
Dp:堆積物
W:シリコン基板
Claims (10)
- 金属を含む膜をエッチングする基板処理装置をクリーニングする方法であって、
水素含有ガスを含むガスを供給し、該水素含有ガスを含むガスから生成されたプラズマによりカーボン含有堆積物を除去する第1のクリーニング工程と、
前記第1のクリーニング工程の後に、不活性ガスを供給し、該不活性ガスから生成されたプラズマにより金属含有堆積物を除去する第2のクリーニング工程と、
前記第2のクリーニング工程の後に、フッ素含有ガス及び酸素含有ガスを含むガスを供給し、該フッ素含有ガス及び酸素含有ガスを含むガスから生成されたプラズマによりシリコン含有堆積物を除去する第3のクリーニング工程と、
を有するクリーニング方法。 - 前記第3のクリーニング工程の後に、水素含有ガスを含むガスを供給し、該水素含有ガスを含むガスから生成されたプラズマによりフッ素含有ガス及び酸素含有ガスを除去する第4のクリーニング工程を有する、
請求項1に記載のクリーニング方法。 - 前記第1のクリーニング工程においてCNの発光強度に基づき第1の終点検出を行った後に前記第2のクリーニング工程を開始する、
請求項1に記載のクリーニング方法。 - 前記第2のクリーニング工程においてPt、Mg、Ta、Co及びRuの少なくともいずれかの発光強度に基づき第2の終点検出を行った後に前記第3のクリーニング工程を開始する、
請求項1に記載のクリーニング方法。 - 前記第3のクリーニング工程においてSiの発光強度に基づき第3の終点検出を行った後に前記第4のクリーニング工程を開始する、
請求項2に記載のクリーニング方法。 - 前記第1のクリーニング工程においてCNの発光強度に基づき行う第1の終点検出の時間、前記第2のクリーニング工程においてPt、Mg、Ta、Co及びRuの少なくともいずれかの発光強度に基づき行う第2の終点検出の時間、及び前記第3のクリーニング工程においてSiの発光強度に基づき行う第3の終点検出の時間に基づき、クリーニング時間の自動制御を行う、
請求項1に記載のクリーニング方法。 - 前記第1のクリーニング工程の前にダミーウェハを搬入し、
前記第2のクリーニング工程の後に該ダミーウェハを搬出して新たなダミーウェハを搬入する、
請求項1に記載のクリーニング方法。 - 金属を含む膜をエッチングする基板処理装置をクリーニングする方法であって、
水素含有ガスを含むガスを供給し、該水素含有ガスを含むガスから生成されたプラズマによりカーボン含有堆積物をクリーニングする第1のクリーニング工程と、
前記第1のクリーニング工程の後に、不活性ガスを供給し、該不活性ガスから生成されたプラズマにより金属含有堆積物をクリーニングする第2のクリーニング工程と、
を有するクリーニング方法。 - 前記第1のクリーニング工程においてCNの発光強度に基づき第1の終点検出を行った後に前記第2のクリーニング工程を開始する、
請求項8に記載のクリーニング方法。 - 基板処理装置内にてエッチングガスにより金属を含む膜をエッチングする工程と、
前記基板処理装置内に水素含有ガスを含むガスを供給し、該水素含有ガスを含むガスから生成されたプラズマによりカーボン含有堆積物を除去する第1のクリーニング工程と、
前記第1のクリーニング工程の後に前記基板処理装置内に不活性ガスを供給し、該不活性ガスから生成されたプラズマにより金属含有堆積物を除去する第2のクリーニング工程と、
前記第2のクリーニング工程の後に前記基板処理装置内にフッ素含有ガス及び酸素含有ガスを含むガスを供給し、該フッ素含有ガス及び酸素含有ガスを含むガスから生成されたプラズマによりシリコン含有堆積物を除去する第3のクリーニング工程と、
を有するプラズマ処理方法。
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JP2003309105A (ja) * | 2002-04-15 | 2003-10-31 | Matsushita Electric Ind Co Ltd | プラズマ処理方法 |
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US10587971B2 (en) * | 2016-11-29 | 2020-03-10 | Semiconductor Manufacturing International (Shanghai) Corporation | Semiconductor device and manufacture thereof |
US11109171B2 (en) | 2016-11-29 | 2021-08-31 | Semiconductor Manufacturing International (Shanghai) Corporation | Semiconductor device and manufacture thereof |
Also Published As
Publication number | Publication date |
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CN107533970A (zh) | 2018-01-02 |
US20180301622A1 (en) | 2018-10-18 |
KR102366893B1 (ko) | 2022-02-23 |
JP6661283B2 (ja) | 2020-03-11 |
CN107533970B (zh) | 2020-10-09 |
TW201709319A (zh) | 2017-03-01 |
TWI696219B (zh) | 2020-06-11 |
KR20180008409A (ko) | 2018-01-24 |
US20190355901A1 (en) | 2019-11-21 |
US10403814B2 (en) | 2019-09-03 |
US10944051B2 (en) | 2021-03-09 |
JP2016219451A (ja) | 2016-12-22 |
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