WO2011145489A1 - 半導体素子の窒化珪素膜、窒化珪素膜の製造方法及び装置 - Google Patents
半導体素子の窒化珪素膜、窒化珪素膜の製造方法及び装置 Download PDFInfo
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- WO2011145489A1 WO2011145489A1 PCT/JP2011/060809 JP2011060809W WO2011145489A1 WO 2011145489 A1 WO2011145489 A1 WO 2011145489A1 JP 2011060809 W JP2011060809 W JP 2011060809W WO 2011145489 A1 WO2011145489 A1 WO 2011145489A1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/34—Nitrides
- C23C16/345—Silicon nitride
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- H—ELECTRICITY
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/0217—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/022—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being a laminate, i.e. composed of sublayers, e.g. stacks of alternating high-k metal oxides
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/02274—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition in the presence of a plasma [PECVD]
Definitions
- the present invention relates to a silicon nitride film used for a semiconductor element and a method and apparatus for manufacturing a silicon nitride film.
- a plasma CVD method and a plasma CVD apparatus are known.
- SiN films Silicon nitride films
- CCD Charge-Coupled Device
- CMOS Complementary Metal-Oxide Semiconductor
- the present invention has been made in view of the above problems, and provides a silicon nitride film of a semiconductor element that suppresses a change in film stress of a silicon nitride film formed by applying bias power, and a method and apparatus for manufacturing a silicon nitride film. For the purpose.
- the silicon nitride film of the semiconductor element according to the first invention for solving the above-described problems is In a silicon nitride film formed on a substrate by plasma treatment and used for a semiconductor element, A first silicon nitride film formed by applying a bias to the substrate; and a second silicon nitride film formed without applying a bias to the substrate, wherein the first silicon nitride film is The silicon nitride film is sandwiched between a hydrogen permeation preventive film having a property of not allowing hydrogen to permeate.
- the silicon nitride film of the semiconductor element according to the second invention for solving the above-mentioned problem is In the silicon nitride film of the semiconductor element according to the first invention,
- the hydrogen permeation preventive film is a third silicon nitride film formed without applying a bias to the substrate. That is, as the silicon nitride film, the first silicon nitride film, the second silicon nitride film, and the third silicon nitride film are included, and the first silicon nitride film is used as the second silicon nitride film and the third silicon nitride film.
- the silicon nitride film is sandwiched between the two.
- a silicon nitride film of a semiconductor element according to a third invention for solving the above-described problem is In the silicon nitride film of the semiconductor element according to the first invention,
- the hydrogen permeation preventive film is a metal oxide film or a metal nitride film.
- a method for manufacturing a silicon nitride film according to a fourth invention for solving the above-described problems is as follows.
- a silicon nitride film used for a semiconductor element is formed on a substrate by plasma treatment.
- a bias is applied to the substrate to form a first silicon nitride film
- a second silicon nitride film is formed without applying a bias to the substrate, and the second silicon nitride film
- the first silicon nitride film is formed so as to be sandwiched between a hydrogen permeation preventive film and a hydrogen permeation preventive film that does not transmit hydrogen.
- a method for manufacturing a silicon nitride film according to a fifth invention for solving the above-described problems is as follows.
- a third silicon nitride film is formed without applying a bias to the substrate. That is, as the silicon nitride film, a first silicon nitride film, a second silicon nitride film, and a third silicon nitride film are formed, and between the second silicon nitride film and the third silicon nitride film.
- a first silicon nitride film is formed so as to be sandwiched.
- a method for manufacturing a silicon nitride film according to a sixth invention for solving the above-described problems is as follows.
- the hydrogen permeation preventive film is a metal oxide film or a metal nitride film.
- An apparatus for manufacturing a silicon nitride film according to a seventh invention for solving the above-described problems In a silicon nitride film manufacturing apparatus for forming a silicon nitride film used for a semiconductor element on a substrate by plasma treatment, Bias supply means for applying a bias to the substrate; As the silicon nitride film, a first silicon nitride film and a second silicon nitride film are formed, and the silicon nitride film is sandwiched between the second silicon nitride film and a hydrogen permeation preventive film having a property of not transmitting hydrogen. In addition, when forming the first silicon nitride film, the bias supply means applies a bias to the substrate to form the second silicon nitride film when forming the first silicon nitride film. In some cases, no bias is applied to the substrate.
- An apparatus for manufacturing a silicon nitride film according to an eighth invention for solving the above-mentioned problems is as follows.
- the bias supply means does not apply a bias to the substrate. That is, as the silicon nitride film, a first silicon nitride film, a second silicon nitride film, and a third silicon nitride film are formed, and between the second silicon nitride film and the third silicon nitride film.
- the bias supply means applies a bias to the substrate when forming the first silicon nitride film so as to sandwich the second silicon nitride film and the third silicon nitride film.
- a bias is not applied to the substrate.
- the hydrogen permeation preventive film is a metal oxide film or a metal nitride film.
- the first silicon nitride film formed by applying a bias has the property of not transmitting hydrogen to the second silicon nitride film formed without applying a bias. Since it is sandwiched between the hydrogen permeation preventive film, a change in film stress in the annealing process performed in the semiconductor manufacturing process can be suppressed. As a result, the annealing process performed in the semiconductor manufacturing process can be performed while maintaining the embeddability of the silicon nitride film.
- the first silicon nitride film formed by applying a bias can be sandwiched between the second silicon nitride film and the third silicon nitride film formed without applying a bias, and the change in film stress can be suppressed only by the silicon nitride film.
- the metal oxide film or the metal nitride film when the metal oxide film or the metal nitride film is in contact with the silicon nitride film, the characteristics of the metal oxide film or the metal nitride film as a hydrogen permeation preventive film are utilized. Since the first silicon nitride film formed by applying a bias is sandwiched between the second silicon nitride film formed without applying a bias, the change in the film stress of the silicon nitride film with a simpler structure Can be suppressed.
- FIG. 1 It is a block diagram which shows an example of embodiment of the manufacturing apparatus of the silicon nitride film which concerns on this invention.
- (A) is sectional drawing which shows the film
- (b) is the graph which measured the stress change of the said silicon nitride film.
- (A) is sectional drawing which shows the film
- (b) is the graph which measured the stress change of the said silicon nitride film.
- (A) is sectional drawing which shows the film
- (b) is the said nitride
- (a) is a silicon nitride film formed by applying bias power, without applying bias power. It is sectional drawing which shows the film
- Embodiments of a silicon nitride film and a method and apparatus for manufacturing a silicon nitride film according to the present invention will be described below with reference to FIGS.
- Example 1 First, the structure of a silicon nitride film (SiN film) manufacturing apparatus used in this embodiment will be described with reference to FIG.
- the present invention can be applied to any plasma processing apparatus that forms a SiN film by applying a bias power, but a plasma CVD apparatus using high-density plasma is particularly suitable.
- FIG. 1 illustrates the plasma CVD apparatus.
- the plasma CVD apparatus 10 includes a vacuum vessel 11 that maintains a high degree of vacuum.
- the vacuum vessel 11 includes a cylindrical vessel 12 and a ceiling plate 13, and a ceiling plate 13 is attached to the upper portion of the cylindrical vessel 12 to form a space sealed from outside air.
- the vacuum vessel 11 is provided with a vacuum device 14 that evacuates the inside of the vacuum vessel 11.
- An RF antenna 15 for generating plasma is installed on the top of the ceiling plate 13.
- An RF power source 17 that is a high frequency power source is connected to the RF antenna 15 via a matching unit 16. That is, the RF power supplied from the RF power source 17 is supplied to the plasma by the RF antenna 15.
- a gas supply pipe 18 that supplies a raw material gas or an inert gas, which is a raw material of a film to be formed, into the vacuum container 11 is installed on the upper side wall of the cylindrical container 12.
- the gas supply pipe 18 is provided with a gas supply amount controller for controlling the supply amount of the source gas and the inert gas.
- SiH 4 , N 2 or the like is supplied as a source gas
- Ar which is a rare gas, is supplied as an inert gas.
- plasma such as SiH 4 , N 2, and Ar is generated above the inside of the vacuum vessel 11.
- a substrate support 20 for holding a substrate 19 that is a film formation target is installed below the cylindrical container 12.
- the substrate support 20 includes a substrate holding unit 21 that holds the substrate 19 and a support shaft 22 that supports the substrate holding unit 21.
- a heater 23 for heating is installed inside the substrate holder 21, and the temperature of the heater 23 is adjusted by a heater control device 24. Thereby, the temperature of the substrate 19 during the plasma processing can be controlled.
- a bias power source 26 is connected to the substrate holder 21 via a matching unit 25 so that bias power can be applied to the substrate 19 (bias supply means). Thereby, ions can be drawn into the surface of the substrate 19 from the plasma. Furthermore, an electrostatic power source 27 is connected to the substrate holding unit 21 so that the substrate 19 can be held by electrostatic force. The electrostatic power source 27 is connected to the substrate holding unit 21 via a low-pass filter 28 so that the power of the RF power source 17 and the bias power source 26 does not wrap around.
- the bias power by the bias power source 26, the RF power by the RF power source 17, the pressure by the vacuum device 14, the substrate temperature by the heater control device 24, and the gas by the gas supply amount controller are included.
- a main control device 29 capable of controlling the supply amount is installed. 1 represents a signal line for transmitting a control signal from the main control device 29 to the bias power source 26, the RF power source 17, the vacuum device 14, the heater control device 24, and the gas supply amount controller. is doing.
- the main controller 29 controls the bias power, RF power, pressure, film formation temperature, and gas supply amount, so that a SiN film can be formed on the substrate 19 by plasma processing. It becomes.
- the plasma CVD apparatus 10 not only forms a SiN film by applying a bias power, but also can form a SiN film without applying a bias power.
- an SiN film (hereinafter referred to as a bias SiN film) formed by applying a bias power and an SiN film (hereinafter referred to as an unbiased SiN film) formed without applying a bias power. I measured the change of stress accompanying the annealing process in the semiconductor manufacturing process.
- FIG. 2 shows a case of a bias SiN film
- FIG. 2 (a) is a cross-sectional view showing the film structure
- FIG. 2 (b) is a graph obtained by measuring the stress change.
- FIG. 3 shows the case of an unbiased SiN film
- FIG. 3 (a) is a cross-sectional view showing the film structure
- FIG. 3 (b) is a graph obtained by measuring the stress change.
- FLX-2320 manufactured by KLA-Tencor was used as a stress measurement device.
- the substrate after the SiN film is formed is heated from room temperature to 450 ° C. in 1 hour with a heater in the stress measurement device, held at 450 ° C. for 30 minutes, and then the temperature is lowered. The change in stress was measured.
- 450 ° C. which has a temperature load higher than the temperature 400 ° C. of the annealing process performed in the semiconductor manufacturing process, was used.
- the deposition conditions for each SiN film were as follows. [Bias SiN film] RF power: 2.0 kW, bias power: 2.4 kW, SiH 4 : 40 sccm, N 2 : 80 sccm, Ar: 20 sccm, pressure 25 mTorr, film thickness 4513 mm [Unbiased SiN film] RF power: 3.0 kW, bias power: 0 W, SiH 4 : 30 sccm, N 2 : 800 sccm, Ar: 0 sccm, pressure 25 mTorr, film thickness 4226 ⁇ This film forming condition is an example.
- the bias SiN film 31 was formed on the Si substrate 19 under the above film forming conditions.
- the stress immediately after the film formation is a compressive stress of ⁇ 254 MPa.
- the bias SiN film 31 has a large amount of hydrogen (particularly, Si—H bond hydrogen), so that a large amount of hydrogen is released by the annealing process, and the film stress changes as the hydrogen is released.
- the unbiased SiN film 32 was also formed on the Si substrate 19 under the above film forming conditions.
- the stress immediately after the film formation is a compressive stress of ⁇ 230 MPa.
- the compressive stress is reduced during holding at 450 ° C., but the stress change at the time of temperature rise and temperature drop is substantially the same, and after annealing, the compressive stress is ⁇ 225 MPa.
- the compressive stress was almost the same before and after annealing. This is because the amount of hydrogen in the unbiased SiN film 32 (particularly, Si—H bond hydrogen) is small, so that the amount of hydrogen released by the annealing process is small and the change in film stress is small.
- the amount of hydrogen in each SiN film is confirmed by IR analysis (infrared analysis, for example, FTIR), as shown in Table 1, the amount of hydrogen in the bias SiN film is 5.1 ⁇ 10 21. [Pieces / cm 3 ], and the hydrogen amount of the unbiased SiN film is 0.1 ⁇ 10 21 [pieces / cm 3 ].
- the amount of hydrogen in the unbiased SiN film is 2% or less of the amount of hydrogen in the biased SiN film and is a dense film with a small hydrogen content.
- the amount of hydrogen in each SiN film the amount of Si—H bonds determined from the peak area of Si—H bonds generated near 2140 cm ⁇ 1 is measured.
- an unbiased SiN film 32 was formed on the Si substrate 19, a biased SiN film 31 was laminated thereon, and the change in stress was measured.
- the film forming conditions for each SiN film at this time are the same as those described above, but only the film thickness of each SiN film is changed, the film thickness of the unbiased SiN film 32 is 1000 mm, and the film of the bias SiN film 31 is used. The thickness was 3000 mm.
- the stress immediately after the film formation is a compressive stress of ⁇ 218 MPa.
- FIG.4 (b) through the process of temperature rising-> temperature falling, the stress changed from compression to tension, and became 29 MPa tensile stress after annealing. This is because, as in the case shown in FIG. 2, since there is a lot of hydrogen in the bias SiN film 31 (particularly, hydrogen of Si—H bond), a lot of hydrogen is released by the annealing treatment. This is because the film stress has changed.
- the film structure shown in FIG. 4A since there is the unbiased SiN film 32 on the lower layer side of the bias SiN film 31, hydrogen detachment from the bias SiN film 31 is not suppressed, and as a result. The change of the film stress is not suppressed.
- an unbiased SiN film 32a (second silicon nitride film) is formed on the Si substrate 19, and a bias SiN film 31 (first silicon nitride film) is formed thereon. Then, an unbiased SiN film 32b (third silicon nitride film) was laminated thereon, and the stress change was measured. That is, the bias SiN film 31 is sandwiched between the unbiased SiN film 32a and the unbiased SiN film 32b.
- each SiN film at this time is the same as those described above, but only the film thickness of each SiN film is changed, and the film thicknesses of the unbiased SiN films 32a and 32b are 1000 mm each, and the bias SiN film The film thickness of 31 was set to 3000 mm.
- the stress immediately after the film formation is a compressive stress of ⁇ 354 MPa.
- the stress change at the time of temperature rise and temperature drop is substantially the same, and after the annealing, it is a compressive stress of ⁇ 328 MPa, and the compressive stress is substantially the same before and after the annealing. .
- the detachment of hydrogen in the bias SiN film 31 is suppressed, the change in film stress is also reduced.
- the bias SiN film 31 is sandwiched between the unbiased SiN films 32a and 32b, it is possible to suppress changes in film stress in the annealing process performed in the semiconductor manufacturing process. As a result, the annealing process performed in the semiconductor manufacturing process can be performed while maintaining the burying property by the bias SiN film 31.
- the unbiased SiN films 32a and 32b function as so-called hydrogen permeation preventive films having a characteristic of not permeating hydrogen.
- the change in film stress may cause blistering or peeling of the SiN film, particularly in the periphery of the substrate.
- the above-described film structure to suppress the change in film stress, The occurrence of film peeling can be suppressed, and as a result, the effect of reducing particles can also be obtained.
- Patent Document 2 discloses that a protective insulating film for preventing hydrogen diffusion is formed on an interlayer insulating film formed by an HDPCVD method to which a bias is applied, by a plasma CVD method without applying a bias.
- these insulating films are all SiO films, and in addition, no configuration is shown for suppressing changes in film stress. Therefore, it is different from the configuration of the present invention described above.
- the present invention is applied to a silicon nitride film used for a semiconductor element, and is particularly suitable for a lens / lens for a CCD / CMOS image sensor and a final protective film (passivation) of wiring.
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Abstract
Description
プラズマ処理により基板上に形成され、半導体素子に用いる窒化珪素膜において、
前記基板にバイアスを印加して形成した第1の窒化珪素膜と前記基板にバイアスを印加しないで形成した第2の窒化珪素膜とを有し、前記第1の窒化珪素膜を、前記第2の窒化珪素膜と水素を透過しない特性を有する水素透過防止膜との間に挟み込む構造としたことを特徴とする。
上記第1の発明に記載の半導体素子の窒化珪素膜において、
前記水素透過防止膜を、前記基板にバイアスを印加しないで形成した第3の窒化珪素膜としたことを特徴とする。
つまり、窒化珪素膜としては、第1の窒化珪素膜と第2の窒化珪素膜と第3の窒化珪素膜とを有し、第1の窒化珪素膜を、第2の窒化珪素膜と第3の窒化珪素膜との間に挟み込む構造となる。
上記第1の発明に記載の半導体素子の窒化珪素膜において、
前記水素透過防止膜を、金属酸化膜又は金属窒化膜としたことを特徴とする。
半導体素子に用いる窒化珪素膜を、プラズマ処理により基板上に形成する窒化珪素膜の製造方法において、
当該窒化珪素膜として、前記基板にバイアスを印加して第1の窒化珪素膜を形成し、前記基板にバイアスを印加しないで第2の窒化珪素膜を形成すると共に、前記第2の窒化珪素膜と水素を透過しない特性を有する水素透過防止膜との間に挟み込むように、前記第1の窒化珪素膜を形成することを特徴とする。
上記第4の発明に記載の窒化珪素膜の製造方法において、
前記水素透過防止膜として、前記基板にバイアスを印加しないで第3の窒化珪素膜を形成することを特徴とする。
つまり、窒化珪素膜としては、第1の窒化珪素膜と第2の窒化珪素膜と第3の窒化珪素膜とを形成し、第2の窒化珪素膜と第3の窒化珪素膜との間に挟み込むように、第1の窒化珪素膜を形成する。
上記第4の発明に記載の窒化珪素膜の製造方法において、
前記水素透過防止膜は金属酸化膜又は金属窒化膜であることを特徴とする。
半導体素子に用いる窒化珪素膜を、プラズマ処理により基板上に形成する窒化珪素膜の製造装置において、
前記基板にバイアスを印加するバイアス供給手段を備え、
当該窒化珪素膜として、第1の窒化珪素膜と第2の窒化珪素膜とを形成すると共に、前記第2の窒化珪素膜と水素を透過しない特性を有する水素透過防止膜との間に挟み込むように、前記第1の窒化珪素膜を形成する際に、前記バイアス供給手段は、前記第1の窒化珪素膜を形成するときには前記基板にバイアスを印加し、前記第2の窒化珪素膜を形成するときには前記基板にバイアスを印加しないことを特徴とする。
上記第7の発明に記載の窒化珪素膜の製造方法の窒化珪素膜において、
前記水素透過防止膜として、第3の窒化珪素膜を形成する際に、前記バイアス供給手段は、前記基板にバイアスを印加しないことを特徴とする。
つまり、窒化珪素膜として、第1の窒化珪素膜と第2の窒化珪素膜と第3の窒化珪素膜とを形成すると共に、第2の窒化珪素膜と第3の窒化珪素膜との間に挟み込むように、第1の窒化珪素膜を形成する際に、バイアス供給手段は、第1の窒化珪素膜を形成するときには基板にバイアスを印加し、第2の窒化珪素膜及び第3窒化珪素膜を形成するときには基板にバイアスを印加していない。
上記第7の発明に記載の窒化珪素膜の製造方法において、
前記水素透過防止膜は、金属酸化膜又は金属窒化膜であることを特徴とする。
最初に、本実施例で用いる窒化珪素膜(SiN膜)の製造装置について、図1を参照して、その構成を説明する。なお、本発明は、バイアスパワーを印加して、SiN膜を成膜するプラズマ処理装置であれば、どのようなものでも適用可能であるが、特に、高密度プラズマを用いたプラズマCVD装置が好適であり、図1では、当該プラズマCVD装置を例示している。
[バイアスSiN膜]
RFパワー:2.0kW、バイアスパワー:2.4kW、SiH4:40sccm、N2:80sccm、Ar:20sccm、圧力25mTorr、膜厚4513Å
[アンバイアスSiN膜]
RFパワー:3.0kW、バイアスパワー:0W、SiH4:30sccm、N2:800sccm、Ar:0sccm、圧力25mTorr、膜厚4226Å
なお、この成膜条件は一例であり、アンバイアスSiN膜の場合、以下の成膜条件の範囲とすれば、後述する特性を得ることができる。
成膜温度:50℃~400℃
SiH4及びN2の総流量に対するRFパワー:7W/sccm以下
ガス流量比:SiH4/(SiH4+N2)=0.036~0.33
18 ガス供給管
19 基板
26 バイアス電源
29 主制御装置
31 バイアスSiN膜
32、32a、32b アンバイアスSiN膜
Claims (9)
- プラズマ処理により基板上に形成され、半導体素子に用いる窒化珪素膜において、
前記基板にバイアスを印加して形成した第1の窒化珪素膜と前記基板にバイアスを印加しないで形成した第2の窒化珪素膜とを有し、前記第1の窒化珪素膜を、前記第2の窒化珪素膜と水素を透過しない特性を有する水素透過防止膜との間に挟み込む構造としたことを特徴とする半導体素子の窒化珪素膜。 - 請求項1に記載の半導体素子の窒化珪素膜において、
前記水素透過防止膜を、前記基板にバイアスを印加しないで形成した第3の窒化珪素膜としたことを特徴とする半導体素子の窒化珪素膜。 - 請求項1に記載の半導体素子の窒化珪素膜において、
前記水素透過防止膜を、金属酸化膜又は金属窒化膜としたことを特徴とする半導体素子の窒化珪素膜。 - 半導体素子に用いる窒化珪素膜を、プラズマ処理により基板上に形成する窒化珪素膜の製造方法において、
当該窒化珪素膜として、前記基板にバイアスを印加して第1の窒化珪素膜を形成し、前記基板にバイアスを印加しないで第2の窒化珪素膜を形成すると共に、前記第2の窒化珪素膜と水素を透過しない特性を有する水素透過防止膜との間に挟み込むように、前記第1の窒化珪素膜を形成することを特徴とする窒化珪素膜の製造方法。 - 請求項4に記載の窒化珪素膜の製造方法において、
前記水素透過防止膜として、前記基板にバイアスを印加しないで第3の窒化珪素膜を形成することを特徴とする窒化珪素膜の製造方法。 - 請求項4に記載の窒化珪素膜の製造方法において、
前記水素透過防止膜は、金属酸化膜又は金属窒化膜であることを特徴とする窒化珪素膜の製造方法。 - 半導体素子に用いる窒化珪素膜を、プラズマ処理により基板上に形成する窒化珪素膜の製造装置において、
前記基板にバイアスを印加するバイアス供給手段を備え、
当該窒化珪素膜として、第1の窒化珪素膜と第2の窒化珪素膜とを形成すると共に、前記第2の窒化珪素膜と水素を透過しない特性を有する水素透過防止膜との間に挟み込むように、前記第1の窒化珪素膜を形成する際に、前記バイアス供給手段は、前記第1の窒化珪素膜を形成するときには前記基板にバイアスを印加し、前記第2の窒化珪素膜を形成するときには前記基板にバイアスを印加しないことを特徴とする窒化珪素膜の製造装置。 - 請求項7に記載の窒化珪素膜の製造装置において、
前記水素透過防止膜として、第3の窒化珪素膜を形成する際に、前記バイアス供給手段は、前記基板にバイアスを印加しないことを特徴とする窒化珪素膜の製造装置。 - 請求項7に記載の窒化珪素膜の製造装置において、
前記水素透過防止膜は、金属酸化膜又は金属窒化膜であることを特徴とする窒化珪素膜の製造装置。
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US13/638,200 US20130071671A1 (en) | 2010-05-21 | 2011-05-11 | Silicon nitride film for semiconductor element, and method and apparatus for manufacturing silicon nitride film |
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US10354860B2 (en) * | 2015-01-29 | 2019-07-16 | Versum Materials Us, Llc | Method and precursors for manufacturing 3D devices |
US11037780B2 (en) * | 2017-12-12 | 2021-06-15 | Asm Ip Holding B.V. | Method for manufacturing semiconductor device with helium-containing gas |
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