WO2004086478A1 - シリコン基板のエッチング方法及びエッチング装置 - Google Patents
シリコン基板のエッチング方法及びエッチング装置 Download PDFInfo
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- WO2004086478A1 WO2004086478A1 PCT/JP2004/003693 JP2004003693W WO2004086478A1 WO 2004086478 A1 WO2004086478 A1 WO 2004086478A1 JP 2004003693 W JP2004003693 W JP 2004003693W WO 2004086478 A1 WO2004086478 A1 WO 2004086478A1
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- silicon substrate
- protective film
- fluorocarbon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
- H01L21/30655—Plasma etching; Reactive-ion etching comprising alternated and repeated etching and passivation steps, e.g. Bosch process
Definitions
- the present invention relates to a silicon substrate etching method and an etching apparatus for forming a structural surface such as a groove on a silicon substrate by a dry etching process.
- Grooves and other structures are formed on a silicon substrate by a dry etching process.
- a dry etching process For example, in the field of semiconductor integrated circuits, higher integration and higher densities are being promoted, and trenches (deep grooves or deep holes) can be formed with high precision. There is a need for an etching technology that can be formed.
- an etching method for the purpose of such a trench etching an etching method disclosed in Japanese Patent Application Laid-Open No. Hei 7-53038 is conventionally known.
- the etching process for forming the grooves or holes by dry etching the substrate table surface using a mixed gas plasma state SF 6 and a r, and also plasma
- a mixed gas of CHF 3 and Ar By using a mixed gas of CHF 3 and Ar and repeating a polymerization step (protective film forming step) of forming a protective film on the side wall of the groove or the hole (hereinafter referred to as a groove or the like), a deep groove or It is to form a deep hole (hereinafter referred to as a deep groove etc.).
- the wall surfaces of the grooves and the like sequentially formed by dry etching are subsequently covered with a protective film. Since the wall surface is protected by this protective film at the time of grinding, extreme side etching / undercut is prevented, and a groove or the like having an apparently vertical wall surface can be formed.
- the above-described etching method has the following problems. That is, since the above-mentioned etching method alternately repeats an etching step without forming a protective film on the wall surface and a step of forming a protective film on the wall surface, it is etched and newly formed. The wall surface formed at this time is in a state where no protective film is formed. For this reason, in the etching process, this wall surface is etched together with the etching ground (the bottom surface of the groove or the like), and as a result, the wall surface becomes wavy in the vertical direction, resulting in poor machining accuracy. Such irregularities formed on the wall surface have hindered high integration and high density in the field of semiconductor integrated circuits.
- the inventors of the present invention have conducted both the etching step and the protective film forming step using a mixed gas of an etching gas and a protective film forming gas while applying a bias voltage by constantly applying power to the silicon substrate.
- a mixed gas of a large amount of etching gas and a small amount of protective film forming gas is used
- a mixed gas of a small amount of etching gas and a large amount of protective film forming gas is used.
- Such an etching method has already been proposed in Japanese Patent Application No. 2001-29094.
- the etching ground is etched by the etching gas in the etching step.
- the vertical structure surface sequentially formed by the etching is immediately covered with the protective film provided from the protective film forming gas, and in the subsequent protective film forming step, the vertical structure surface is formed. Is further firmly covered with a protective film. Thereby, the etching of the vertical structure surface is suppressed, and the vertical structure surface having small irregularities on the surface and excellent perpendicularity can be formed.
- the etching ground can be physically etched by ion irradiation, so that the etching speed is increased in the etching step, while the etching ground is increased in the protective film forming step. This prevents the formation of a protective film on the substrate, and as a result, has the effect of reducing the overall etching time.
- the protective film can be prevented from being formed on the etching ground by the etching gas or ions, and the effect of shortening the entire etching time can be obtained.
- the etching gas also acts on the vertical structure surface, the vertical structure surface becomes an environment where it is easily etched, and in some cases, there is a disadvantage that the surface cannot be sufficiently smoothed.
- the present inventors have conducted intensive studies on the mixing ratio of the mixed gas, and as a result, have found that the protective film forming gas is not used in the etching progress step, and that the protective film is not used.
- Optimum mixing ratio that makes the etching speed faster than the etching method that does not use an etching gas in the formation process, and that the vertical structure surface formed by etching is sufficiently smooth and has excellent squareness.
- the present invention provides a method of etching a silicon substrate and an etching apparatus which can make the vertical structure surface formed by etching sufficiently smooth and excellent in squareness without lowering the etching rate.
- the purpose is to provide. Disclosure of the invention
- the present invention provides a mask forming step of forming an etching mask on a silicon substrate surface, and drying the silicon substrate surface through an opening of the etching mask using an etching gas plasmatized by high frequency power. And etching the silicon substrate by sequentially performing an etching step of etching to form a predetermined structural surface,
- a SF 6 gas as an etching gas and a fluorocarbon gas (C x F y) such as C 4 F 8 as a protective film forming gas are used.
- C x F y fluorocarbon gas
- etching method was carried out by sequentially repeating the step of forming a protective film on the structure surface perpendicular to etch ground as the main Said mixed gas, and that fluorosilicone force one Bongasu mixed 5 to 1 2 weight against SF 6 gas 1 0 0 volume in the dry Etsu quenching progression step,
- the present invention relates to a method for etching a silicon substrate, wherein the mixed gas in the protective film forming step is obtained by mixing 2 to 5 volumes of SF 6 gas with 100 volumes of fluorocarbon gas.
- the etching ground is etched by the SF 6 gas or ion irradiation, and the vertical structure surface sequentially formed by the etching is provided by the fluorocarbon gas. Immediately covered by a protective film.
- the vertical structure surface is more firmly covered with the protective film, and the protective film is formed on the etching ground by etching gas ion irradiation. It is suppressed.
- the mixed gas in the dry etching progression step those fluoroalkyl force one Pongasu mixed 5 to 1 2 volume against SF 6 gas 1 0 0 volume, i.e., SF 6 gas and fluorocarbon gas Are preferably mixed in a volume ratio of 100: 5 to 12. If the amount of fluorocarbon gas is less than 5 volumes, the amount of fluorocarbon gas is too small to effectively protect the vertical structure surface formed by etching, while the amount of fluorocarbon gas is 1 volume. When the volume exceeds 2 volumes, the amount of the fluorocarbon gas is too large, so that the protective film is easily formed on the etching ground, and the energy for performing the etching action is largely consumed for the peeling of the protective film. This is because the etching speed is reduced as compared with the etching method that does not use the method.
- the mixed gas in the protective film forming step is a fluorocarbon gas. 1 0 0 which the SF 6 gas was 2-5 volume mixing with capacitive, i.e., 0 1 a full Rollo carbon gas and SF 6 gas at a volume ratio of 0: those engaged mixed in the range of 2-5 Is preferred. If the amount of SF 6 gas is less than 2 volumes, the amount of SF 6 gas is too small and the formation of a protective film on the etching duland cannot be sufficiently suppressed, so that a sufficient etching rate can be obtained. On the other hand, if the amount of SF 6 gas exceeds 5 volumes, the amount of SF 6 gas is too large, so that the vertical structure surface is easily etched and the surface accuracy deteriorates.
- the mixed gas of the SF 6 gas and the fluorocarbon gas is used, and the mixed gas in the dry etching progressing step and the mixed gas in the protective film forming step have the above-mentioned mixing ratio, respectively. Therefore, compared to an etching method that does not use a protective film forming gas in the dry etching progressing step and does not use an etching gas in the protective film forming step, the etching rate is increased, and the vertical structure surface formed by etching is reduced. A smooth surface with high surface accuracy can be obtained.
- the power applied to the silicon substrate is set high in the dry etching progressing step and low in the protection film forming step.
- the irradiation rate of ions in the dry etching proceeding step can be increased and the etching rate can be increased.
- the protective film forming step the protective film formed on the vertical structure surface is irradiated by the irradiated ions. Peeling can be made very small, and the vertical structure surface can be protected more effectively.
- the high-frequency power for generating the plasma is also increased in the dry etching proceeding step and is decreased in the protective film forming step.
- the SF 6 gas is efficiently turned into plasma and etched.
- the ratio of SF 6 gas to be converted into plasma is reduced, so that the vertical structure surface is hardly etched, and the vertical structure surface is more effectively protected. Can be.
- the above-mentioned etching step may be started from a dry etching proceeding step or from a protective film forming step, but starting from the protective film forming step makes unevenness of the vertical structure surface smaller. It is preferable in that it can be used.
- the above-described etching method can be suitably performed by the following etching apparatus.
- the etching apparatus includes: an etching chamber for accommodating a silicon substrate to be etched; a base disposed at a lower position in the etching chamber, on which the silicon substrate is mounted; Etching gas supply means for supplying SF 6 gas as an etching gas to the etching chamber; protection film forming gas supply means for supplying a flow port carbon gas as a protection film forming gas into the etching chamber; and decompression means for reducing the pressure in the etching chamber.
- a coil disposed on the outer periphery of the etching chamber so as to face the same, and applying high-frequency power to the coil to convert the SF 6 gas and the fluorocarbon gas supplied into the etching chamber.
- Plasma generating means for generating plasma, base power for applying high-frequency power to the base Application means; gas flow control means for controlling the flow rates of the SF 6 gas and the fluorocarbon gas supplied into the etching chamber by the etching gas supply means and the protective film forming gas supply means; and the plasma Coil power control means for controlling power applied to the coil of the generating means, and base power control means for controlling power applied to the base by the base power application means,
- Said gas flow rate control means communicating the SF 6 gas and flow inlet carbon gas Supplies to the etch chamber by periodically changing the connection target and its supply quantity, and controls the supply amount to both phases is reversed, further when a large amount supplied of the SF 6 gas SF 6 the fluorocarbon gas 5 to 1 2 capacitively fed to gases 1 0 0 volume, wherein at the time of a large amount supply fluorocarbon gas is composed of SF 6 gas to fluorocarbon gas 1 0 0 volume to 2-5 volume supply It is characterized by becoming.
- the base power control means is configured to increase the power applied to the base when a large amount of the SF 6 gas is supplied and to decrease the power when a large amount of the fluorocarbon gas is supplied.
- the coil power control means is configured to increase the power applied to the coil when a large amount of the SF 6 gas is supplied and to decrease the power when a large amount of the fluorocarbon gas is supplied. preferable.
- FIG. 1 is a cross-sectional view partially showing a schematic configuration of an etching apparatus according to the present embodiment in a block diagram.
- FIG. 2 is a flow chart showing the flow rates of SF 6 gas and C 4 F 8 gas, and a coil and a base. 6 is a timing chart showing a control state of high-frequency power applied to the power supply.
- FIG. 3 is an explanatory diagram for explaining an evaluation method in an experimental example.
- FIG. 4 is a table showing the measurement results of the etching speed in Experimental Example 1
- FIG. 5 is a graph showing the measurement results of the etching speed in Experimental Example 1
- FIG. 7 is a table showing the measurement results of the surface accuracy P in Experimental Example 1
- FIG. 8 is a graph showing the measurement results of the surface accuracy P in Experimental Example 1.
- FIG. 9 is a table showing measurement results at an angle of 0 in Example 1
- FIG. 9 is a graph showing measurement results at an angle of 0 in Experimental Example 1.
- FIG. 10 is a table showing the measurement results of the etching speed in Experimental Example 2
- FIG. Is a graph showing the measurement results of the etching rate in Experimental Example 2
- FIG. 12 is a table showing the measurement results of surface accuracy; 0 in Experimental Example 2
- FIG. 13 is a table showing the experimental results.
- FIG. 14 is a graph showing the measurement results of the surface accuracy p in Example 2
- FIG. 14 is a table showing the measurement results of the angle 0 in Experimental Example 2
- FIG. 15 is a table showing the angles in Experimental Example 2. It is a graph showing the measurement result of 0. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a schematic configuration of an etching apparatus according to the present embodiment.
- FIG. 4 is a cross-sectional view shown by a block diagram of FIG.
- the etching apparatus 1 is made of a ceramic or the like and has a housing-like etching chamber 2 in which an etching chamber 2a is formed, and a lower chamber in the etching chamber 2a. is set, a base 3 for supporting the silicon substrate S serving etching object, fluorosilicone force one Bongasu of C 4 F 8, or the like serving Etsu Chingugasu serving SF 6 gas and protective film deposition gas into the etching chamber 2 a (C x F y), a pressure reducing section 13 for reducing the pressure in the etching chamber 2a, and a plasma generating section for converting the 3 ⁇ 6 gas and the fluorocarbon gas supplied into the etching chamber 2a into plasma. 15; a high-frequency power supply 18 for applying high-frequency power to the base 3; and a control device 20 for controlling the operation of these components.
- a silicon substrate S is placed via a sealing member such as an O-ring 4.
- the base 3 is provided so that the base portion 3 a is derived to 2 a outside the etching chamber, in its central portion, based alloy is 3 and the silicon substrate
- a communication path 5 is provided to communicate with a space 5a formed between the space S and the space 5a, and the space 5a is filled and sealed with helium gas through the communication path 5.
- a cooling water circulation path 6 is formed in the base 3, and the cooling water (20 ° C.) circulating in the cooling water circulation path 6 allows the silicon substrate to pass through the base 3 and helium gas.
- S is to be cooled.
- a high frequency power of 13.56 MHz is applied to the base 3 by the high frequency power supply 18, and a bias potential is applied to the base 3 and the silicon substrate S mounted on the base 3. Is coming to occur.
- the gas supply section 7 includes a gas supply pipe 8 connected to the upper end of the etching chamber 2, and a gas cylinder 9 connected to the gas supply pipe 8 via a masuff port controller 11, 12.
- the gas whose flow rate has been adjusted by the mass flow controllers 11 and 12 is supplied from the gas cylinders 9 and 10 into the etching chamber 2a.
- the gas cylinder 9 is filled with SF 6 gas for etching
- the gas cylinder 10 is filled with C 4 F 8 gas for forming a protective film.
- the pressure reducing unit 13 includes an exhaust pipe 14 connected to a lower end of the etching chamber 2 and a vacuum pump (not shown) connected to the exhaust pipe 14. The inside of the etching chamber 2a is reduced to a predetermined low pressure.
- the plasma generation unit 15 includes a coil 16 disposed along the outer periphery of the etching chamber 2 at a position higher than the base 3, and a high frequency power of 13.56 MHz is applied to the coil 16.
- a high-frequency power supply 17 is applied, and a high-frequency power is applied to the coil 16 to form a fluctuating magnetic field in the space inside the etching chamber 2a, and the gas supplied into the etching chamber 2a generates the fluctuating magnetic field. It is turned into plasma by the electric field induced by this.
- the control device 20 controls the mass flow controllers 11 and 12, and controls gas flow control means 21 that adjusts a gas flow supplied from the gas cylinders 9 and 10 into the etching chamber 2 a. It comprises coil power control means 22 for controlling the high frequency power applied to the coil 16 and base power control means 23 for controlling the high frequency power applied to the base 3.
- an etching mask of a desired shape (for example, a resist film or a SiO 2 film) is formed on a silicon substrate S using photolithography or the like, and then the silicon substrate S is carried into the etching chamber 2. It is placed on the base 3 via the O-ring 4. Then, the space gas is filled and sealed from the communication passage 5 into the space 5a.
- the cooling water in the cooling water circuit 6 is constantly circulated.
- SF 6 gas and C 4 F 8 gas are supplied from the gas cylinders 9 and 10 into the etching chamber 2a, respectively, and high-frequency power is applied to the coil 16 and high-frequency power is applied to the base 3 .
- the flow rates of the S 6 gas and the C 4 F 8 gas V d 2 (ie, the mixing capacity ratio) V e 1 are controlled by the gas flow control means 21 so that they are reversed.
- V d 2 force "1 0 0: Uni I of 5 to 1 2 in the range, also the flow rate V.
- the flow rate ratio (i.e., mixing capacity Ratio) V e 2 : V d 1 will be in the range of 2 to 5: 100
- the gas flow rate is controlled by the gas flow rate control means 21.
- the high-frequency power applied to the coil 16 is W, as shown in Fig. 2 (c). 2 to W. , Varies from a rectangular wave, high frequency power applied to the base 3, as shown in FIG. 2 (d), it changes the rectangle wave in the range of W p 2 of W p 1, and
- the phase of the high-frequency power applied to the coil 16 and the phase of the high-frequency power applied to the base 3 are controlled by the coil power control means 22 and the base power control means 23 so that they have the same phase.
- the SF 6 gas and the C 4 F 8 gas supplied into the etching chamber 2 a become plasma containing ions, electrons, F radicals, etc. in the fluctuating magnetic field generated by the coil 16, and the plasma generates the fluctuating magnetic field.
- the F radicals present in the plasma chemically react with Si and carry Si away from the silicon substrate S, that is, function to etch the silicon substrate S, and ions are generated on the base 3 and the silicon substrate S.
- the silicon substrate S is accelerated toward the base 3 and the silicon substrate S by the self-bias potential, and collides with and etches the silicon substrate S.
- the surface (etching ground) of the silicon substrate S at the mask opening is etched by the F radical and the ions, and a groove or the like having a predetermined width and depth is formed.
- the C 4 F 8 gas is converted into a polymer by being converted into plasma, and is deposited on the wall and the bottom surface (etching ground) of the groove and the like to form a fluorocarbon film.
- This fluorocarbon film does not react with F radicals but acts as a protective film against F radicals, and this protective film prevents side etching and undercut.
- the supply amount of SF 6 gas is increased to V e
- the supply amount of C 4 F 8 gas is reduced to V d 2
- the coil 1 the RF power applied to 6 as high as W c 1, and by increasing the RF power applied to the base 3 and W p 1.
- the ion irradiation speed can be reduced to the extent necessary to peel off the polymer deposited on the etching ground, and the ion irradiation speed is reduced.
- the protective film can be prevented from being peeled off by ion irradiation.
- the etching is suppressed to such an extent that the deposited polymer is peeled off by ion irradiation, but on the wall surface with less ion irradiation, more polymer is deposited, and the polymer is deposited. A protective film is formed.
- the step of mainly performing the etching and the step of mainly performing the formation of the protective film are alternately repeated, and are sequentially formed by etching.
- the wall surface to be formed is immediately covered with the protective film, and in a subsequent step, the protective film is formed more strongly, so that the above-described side etching and undercut can be reliably prevented. Accordingly, a trench whose inner wall surface is vertical and whose unevenness is equal to or less than a predetermined reference value can be efficiently formed on the silicon substrate S.
- the flow rate V of the SF 6 gas for achieving such an action is preferably in the range of 6 0 ⁇ 6 OO ml Zm in
- the C 4 F 8 flow rate V d 1 of the gas is preferably in the range of 5 0 ⁇ 40 0 ml Zm in .
- the flow rate of C 4 F 8 gas V d 2 is the flow rate of SF 6 gas In ratio of V e 1, V d 2: V ⁇ 1 is 5-1 2: 1 is preferably 0 0 range become by Una flow. If V d 2 is less than 5, the amount of C 4 F 8 gas is too small to effectively protect the walls formed by etching, while if V d 2 exceeds 12, This is because if the amount of the C 4 F 8 gas is too large, a protective film is easily formed on the etching ground, and energy for performing the etching action is largely consumed for peeling off the protective film, and the etching speed is reduced.
- the flow rate Ve 2 of SF 6 gas is such that the ratio of V e 2 : V d 1 is in the range of 2 to 5: 100 in comparison with the flow rate V d of C 4 F 8 gas. It is preferred that If V e 2 is less than 2, the amount of SF 6 gas is too small and the formation of a protective film on the etching ground cannot be sufficiently suppressed, so that a sufficient etching rate cannot be obtained. On the other hand, when V e 2 exceeds 5, the amount of SF 6 gas is too large, and the wall surface is likely to be etched, and the surface accuracy is deteriorated.
- frequency power W c 1 applied to Koi zone les 1 6 is in the range of 8 0 0 ⁇ 3 0 0 0 W
- W c 2 is the 6 0 0 ⁇ 2 5 0 0W range der Preferably.
- frequency power W p to be applied to the base 3 is in the range of 3 ⁇ 5 0 W (more preferably 1 0 ⁇ 5 0W)
- W p 2 is 2 ⁇ 2 5 W (more preferably 5 to 25 W).
- the execution time of the step e is preferably in a range of 3 to 45 seconds
- the execution time of the step d is preferably in a range of 3 to 30 seconds.
- a mixed gas of SF 6 gas and C 4 F 8 gas fluorocarbon gas
- a mixed gas in the etching progressing step and a mixed gas in the protective film forming step are used.
- the protective film forming gas is not used in the etching progressing step,
- the etching rate can be increased as compared with the etching method not using an etching gas in the protective film forming step, and the wall surface formed by the etching can be a smooth surface with high surface accuracy.
- a C 4 F 8 gas as a protective film forming gas
- the W p 2 and 2 0 W the flow rate V e 1 of SF 6 gas e step 4 5 0 ml /
- the flow rate of C 4 F 8 gas in step d, V d1 was set to 150 ml Zmin, and the flow rate V of SF 6 gas in step d.
- the processing time of the step e was 8.5 seconds, and the processing time of the step d was 3 seconds, and the steps e and d were repeated for 15 minutes.
- the pressure in the etching chamber 2 was 4. O Pa in the e step, and 1.9 Pa in the d step.
- FIG. 4 is a table showing the measurement results of the etching rate (jtmZmin) under each of the above etching conditions
- FIG. 5 is a graph thereof.
- FIG. 6 is a table showing measurement results of the surface accuracy (unevenness) p (nm)
- FIG. 7 is a graph thereof.
- FIG. 8 is a table showing the measurement results of the angle 0 (°)
- FIG. 9 is a graph thereof.
- the flow rate V ⁇ 2 of SF 6 gas is set to 100 with the flow rate V d 1 (150 m I / min) of C 4 F 8 gas. This is expressed by the flow rate (capacity) ratio of the case, and the flow rate of C 4 F 8 gas V d 2 is also the same when the flow rate of SF 6 gas V e 1 (450 m I / min) is 100 This is expressed by the flow rate (capacity) ratio of
- the flow rate of SF 6 gas was The flow ratio of V ⁇ 2 to C 4 F 8 gas flow rate V d , is in the range of 2 to 5, and C 4 F 8 gas flow rate V d 2 S
- the flow ratio F 6 gas to the flow rate V beta is in the range of 5 to 1 2
- the etching rate is preferably as fast as possible.
- the surface accuracy (irregularity) p (nm) is small.
- the angle 0) is close to 90 °, but a preferable angle is 91 ° or less.
- the flow rate V d 1 of the C 4 F 8 gas in the process is set to 60 m I / min
- the flow rate V e 2 of the SF 6 gas in the d process is set to O ml Zm in, 1 Z m I / m In, 1.8 m I / m ⁇ n, 3 m I / min, D m I / min and change the flow rate V d 2 of C 4 F 8 gas in the e process to O ml Z min, 10 m Etching the
- Hole 31 was formed. Note that the processing time of the step e was set to 15 seconds, and the processing time of the step d was set to 7 seconds, and the steps e and d were repeated for 30 minutes.
- the pressure in the etching chamber 2 was 2.5 Pa in the e-step and 0.8 Pa in the d-step.
- FIGS. 10 to 15 The results are shown in FIGS. 10 to 15.
- FIG. 10 is a table showing the measurement results of the etching rate (/ m / m ⁇ ) under the above etching conditions, and FIG. 11 is a graph thereof.
- FIG. 12 is a table showing the measurement results of the surface accuracy (unevenness) ⁇ (nm), and FIG. 13 is a graph thereof.
- FIG. 14 is a table showing measurement results of the angle 0 (°), and FIG. 15 is a graph thereof.
- the flow rate V beta 2 of SF 6 gas was C 4 F 8 gas flow rate V d 1 (6 0 ml Roh min) 1 00 This is expressed by the flow rate ratio in this case, and the flow rate of C 4 F 8 gas V d 2 is also the same assuming that the flow rate V e 1 (200 m I / mi ⁇ ) of SF 6 gas is 100. This is represented by the flow ratio of
- Li there is divided Li, from this result, the flow rate V beta 2 and SF 6 gas in the step d in step e It can be seen that by setting the flow rate V d 2 of the C 4 F 8 gas to an appropriate amount, the etching rate, surface accuracy (irregularity) P (nm), and angle 0) can be improved.
- the flow ratio of SF 6 gas V ⁇ 2 to C 4 F 8 gas flow V d was 2 to 5.
- the flow rate ratio of the C 4 F 8 gas V d 2 to the SF 6 gas flow V ⁇ within the range of 5 to 12, the etching rate and the surface accuracy (unevenness) ⁇ (nm ) And an angle of 0 (°).
- the preferable ranges of the etching rate, surface accuracy (irregularity) p (nm), and angle 0) were determined based on the same standards as those in Experimental Example 1.
- the flow rate V ⁇ of SF 6 gas and C 4 F 8 gas flow rate V d multi I regardless of no small a, SF 6 gas flow rate V beta 2 of C 4 F 8 gas flow rate V d, against that flow ratio is in the range of 2-5,
- the flow ratio of C 4 F 8 gas V d 2 to SF 6 gas flow V ⁇ is in the range of 5 to 12
- the etching speed, surface accuracy (unevenness) ⁇ (nm) and angle 0 ) was found to be good.
- the tuning device can be suitably used when a structural surface such as a groove is formed on a silicon substrate by a dry etching process.
Abstract
Description
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US10/988,042 US7220678B2 (en) | 2003-03-25 | 2004-11-12 | Method for etching of a silicon substrate and etching apparatus |
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JP2003082740A JP4065213B2 (ja) | 2003-03-25 | 2003-03-25 | シリコン基板のエッチング方法及びエッチング装置 |
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US10/988,042 Continuation US7220678B2 (en) | 2003-03-25 | 2004-11-12 | Method for etching of a silicon substrate and etching apparatus |
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Cited By (1)
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EP1748475A2 (en) * | 2005-07-27 | 2007-01-31 | Sumitomo Precision Products Co., Ltd. | Etching method and etching apparatus |
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JP4209774B2 (ja) * | 2001-09-28 | 2009-01-14 | 住友精密工業株式会社 | シリコン基板のエッチング方法およびエッチング装置 |
JP4629421B2 (ja) * | 2004-12-06 | 2011-02-09 | パナソニック株式会社 | ドライエッチング方法及びドライエッチング装置 |
KR100709354B1 (ko) * | 2005-06-17 | 2007-04-20 | 삼성전자주식회사 | 다채널 플라즈마 가속장치 |
JP4512529B2 (ja) * | 2005-07-15 | 2010-07-28 | 住友精密工業株式会社 | エッチング方法及びエッチング装置 |
WO2007031778A1 (en) * | 2005-09-16 | 2007-03-22 | Aviza Technology Limited | A method of etching a feature in a silicone substrate |
JP4812512B2 (ja) | 2006-05-19 | 2011-11-09 | オンセミコンダクター・トレーディング・リミテッド | 半導体装置の製造方法 |
JP5143382B2 (ja) * | 2006-07-27 | 2013-02-13 | オンセミコンダクター・トレーディング・リミテッド | 半導体装置及びその製造方法 |
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EP1748475A3 (en) * | 2005-07-27 | 2007-03-07 | Sumitomo Precision Products Co., Ltd. | Etching method and etching apparatus |
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Also Published As
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JP2004296474A (ja) | 2004-10-21 |
JP4065213B2 (ja) | 2008-03-19 |
US20050130436A1 (en) | 2005-06-16 |
US7220678B2 (en) | 2007-05-22 |
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