WO2005024924A1 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- WO2005024924A1 WO2005024924A1 PCT/JP2004/012537 JP2004012537W WO2005024924A1 WO 2005024924 A1 WO2005024924 A1 WO 2005024924A1 JP 2004012537 W JP2004012537 W JP 2004012537W WO 2005024924 A1 WO2005024924 A1 WO 2005024924A1
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- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/38—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by treatments done after the formation of the materials
- H10P14/3802—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
- H10P14/3808—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth using laser beams
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- H10D30/00—Field-effect transistors [FET]
- H10D30/01—Manufacture or treatment
- H10D30/021—Manufacture or treatment of FETs having insulated gates [IGFET]
- H10D30/031—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT]
- H10D30/0312—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT] characterised by the gate electrodes
- H10D30/0314—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT] characterised by the gate electrodes of lateral top-gate TFTs comprising only a single gate
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- H10D30/01—Manufacture or treatment
- H10D30/021—Manufacture or treatment of FETs having insulated gates [IGFET]
- H10D30/031—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT]
- H10D30/0321—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT] comprising silicon, e.g. amorphous silicon or polysilicon
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/6729—Thin-film transistors [TFT] characterised by the electrodes
- H10D30/673—Thin-film transistors [TFT] characterised by the electrodes characterised by the shapes, relative sizes or dispositions of the gate electrodes
- H10D30/6731—Top-gate only TFTs
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- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/674—Thin-film transistors [TFT] characterised by the active materials
- H10D30/6741—Group IV materials, e.g. germanium or silicon carbide
- H10D30/6743—Silicon
- H10D30/6745—Polycrystalline or microcrystalline silicon
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- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/29—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by the substrates
- H10P14/2901—Materials
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- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/32—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by intermediate layers between substrates and deposited layers
- H10P14/3202—Materials thereof
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- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
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- H10P14/34—Deposited materials, e.g. layers
- H10P14/3402—Deposited materials, e.g. layers characterised by the chemical composition
- H10P14/3404—Deposited materials, e.g. layers characterised by the chemical composition being Group IVA materials
- H10P14/3411—Silicon, silicon germanium or germanium
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- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/34—Deposited materials, e.g. layers
- H10P14/3451—Structure
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- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/38—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by treatments done after the formation of the materials
- H10P14/3802—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
- H10P14/3808—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth using laser beams
- H10P14/381—Beam shaping, e.g. using a mask
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- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/38—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by treatments done after the formation of the materials
- H10P14/3802—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
- H10P14/382—Scanning of a beam
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- H10P34/00—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices
- H10P34/40—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices with high-energy radiation
- H10P34/42—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices with high-energy radiation with electromagnetic radiation, e.g. laser annealing
Definitions
- the present invention relates to a method for manufacturing a semiconductor device.
- it relates to a method for manufacturing a thin film semiconductor.
- MOS-FET MOS-FET
- a polycrystalline silicon semiconductor layer is formed on an insulating substrate, and then a gate insulating film is formed on the polycrystalline silicon film by a chemical vapor deposition (CVD) method.
- CVD chemical vapor deposition
- a general method is to stack a silicon oxide film and further form a gate electrode thereon.
- crystal defects, impurities, and the like may be localized on the surface of polycrystalline silicon serving as a MOS interface.
- Japanese Patent Application Laid-Open No. 11-67758 discloses a manufacturing method including a step of oxidizing a polycrystalline silicon film in an atmosphere containing oxygen having a low oxidation rate as a main component.
- oxidation at the surface layer of the polycrystalline silicon film progresses slowly, crystal defects can be reduced, the film quality can be made uniform, and the surface of the polycrystalline silicon film that remains without being oxidized can be reduced. Can be suppressed.
- the speed of oxidation in the polycrystalline silicon film can be increased, and a high-quality semiconductor with few crystal defects can be obtained.
- a method for forming a monocrystalline silicon film a method such as a furnace annealing method (solid phase growth method) or a laser annealing method (melt recrystallization method) is used.
- Japanese Patent Application Laid-Open No. 9-312403 discloses a manufacturing method for holding a nickel element in contact with a specific region of an amorphous silicon film. Heat treatment is applied to the amorphous silicon film on which the nickel element is arranged so that the crystal grows in a direction parallel to the substrate.
- a thermal oxide film is formed by performing a heat treatment in an oxidizing atmosphere containing a halogen element. Then, a thin film transistor (TFT: Thin Film Transistor) is manufactured in combination with the above-described crystal growth direction and the direction connecting the source / drain regions. By this manufacturing method, a thin film transistor having excellent mobility and S value as transistor characteristics can be obtained.
- TFT Thin Film Transistor
- Patent Document 1 JP-A-11-67758 (Pages 3-6, Fig. 1-4)
- Patent Document 2 JP-A-9-312403 (Pages 4-10, Fig. 1-5)
- the MS interface can be formed inside the polycrystalline silicon film. Therefore, a M ⁇ S interface with few crystal defects and impurities on the surface of polycrystalline silicon can be formed, and a thin film transistor with excellent transistor characteristics can be obtained.
- the amorphous silicon film is irradiated with laser light to form the polycrystalline silicon film.
- a general method using laser annealing is adopted. In this method, crystal growth of polycrystalline silicon occurs from below the molten silicon film, that is, from the side of the deepest and cooler insulating substrate. Since the crystal grows from the lower part to the upper part of the silicon film, that is, toward the surface, a crystal which is closer to the silicon surface is formed.
- the MOS interface where the source region and the drain region are formed may be formed in a portion of the polycrystalline silicon film where the crystallinity is inferior, although the cleanliness is maintained. It becomes. Since the semiconductor layer is formed in a portion of the polycrystalline silicon film having poor crystallinity, there has been a problem that the performance of the thin film transistor has not been sufficiently improved.
- the present invention has been made to solve the above problems, and has as its object to provide a method of manufacturing a semiconductor device capable of easily manufacturing a semiconductor device having excellent crystallinity.
- a method of manufacturing a semiconductor device includes an amorphous silicon laminating step of forming an amorphous silicon film on a substrate, and irradiating the amorphous silicon film with laser light.
- a pulse laser beam having a wavelength of 350 nm or more and 800 nm or less converted into a linear beam having an energy density gradient of at least 3 (mj / cm 2 ) / am in the width direction is used.
- the oxidation step is performed in an atmosphere of saturated steam at a temperature of 500 ° C or more and 650 ° C or less and a pressure of 10 atm or more.
- a semiconductor device having excellent crystallinity can be easily manufactured.
- FIG. 1 is a cross-sectional view illustrating a first step in a method for manufacturing a semiconductor device according to the present invention.
- FIG. 2 is a cross-sectional view illustrating a second step in the method for manufacturing a semiconductor device according to the present invention.
- FIG. 3 is a sectional view illustrating a third step in the method for manufacturing a semiconductor device according to the present invention.
- FIG. 4 is a cross-sectional view illustrating a fourth step in the process of manufacturing a semiconductor device according to the present invention.
- FIG. 5 is a sectional view illustrating a fifth step of the method for manufacturing a semiconductor device according to the present invention.
- FIG. 6 is a sectional view illustrating a sixth step in the method for manufacturing a semiconductor device according to the present invention.
- FIG. 7 is a schematic view of an apparatus for irradiating a laser beam according to the present invention.
- FIG. 8A is a schematic perspective view when irradiating a laser beam in the method of manufacturing a semiconductor device according to the present invention.
- FIG. 8B is a perspective view illustrating an amorphous silicon film irradiated with a laser beam in the method of manufacturing a semiconductor device according to the present invention.
- FIG. 9 is an explanatory view when irradiating laser light to an amorphous silicon film in the method of manufacturing a semiconductor device according to the present invention.
- FIG. 10A is an explanatory diagram when a melted part is crystallized in a production method according to the present invention.
- FIG. 10B is an explanatory diagram when a melted part is crystallized in a manufacturing method based on a conventional technique.
- FIG. 11 is a plan view illustrating crystal grains of a polycrystalline silicon film formed according to the present invention.
- FIG. 12 is an enlarged cross-sectional view of the vicinity of a MOS interface of a thin film transistor manufactured according to the present invention.
- FIG. 13 is a graph illustrating the mobility of a thin film transistor manufactured by each of the manufacturing methods.
- FIG. 14 is a graph illustrating threshold voltages of thin film transistors manufactured by the respective manufacturing methods.
- Insulating substrate 2 Amorphous silicon film, 3 Polycrystalline silicon film, 5 Silicon oxide film, 6 Gate electrode, 7 Protective film, 8 Source'drain electrode, 10 Second harmonic oscillator of Nd: YAG laser, 11 Removable attenuator, 12 moving stage, 13 target, 14 linear beam shaping optical system, 15 condenser lens, 16 laser beam, 20 fusion zone, 21 crystal Grains, 22 source'drain region, 25, 26 length, 30, 31, 32 laser light profile, 35 temperature distribution curve, 40, 41, 42, 43, 44, 45, 46, 50, 51, 52 arrows.
- FIGS. 1 to 6 are cross-sectional views illustrating an example of a method for manufacturing a semiconductor device according to the present invention.
- the semiconductor device according to the present embodiment is a MOS-FET.
- FIG. 1 is an explanatory diagram of an amorphous silicon lamination process.
- An amorphous silicon film 2 is formed on the upper surface of the insulating substrate 1 by using a CVD method as shown by an arrow 40.
- the insulating substrate 1 other than a glass substrate, for example, a substrate obtained by forming a silicon oxide film as a base film on the upper surface of a glass substrate is used.
- a silicon oxide film having a thickness of 200 nm formed on the upper surface of a glass substrate by a CVD method is used as a film material on the substrate.
- an amorphous silicon film 2 is formed to a thickness of 70 ⁇ m by LPCVD (Low Pressure CVD).
- FIG. 2 is an explanatory diagram of the irradiation step.
- the upper surface of the amorphous silicon film 2 is irradiated with laser light in the direction of arrow 41.
- the laser beam irradiation heats and melts the amorphous silicon film 2.
- the crystal structure becomes a polycrystalline structure, and a polycrystalline silicon film 3 is formed.
- FIG. 4 is an explanatory diagram of the oxidation step.
- the surface of the polycrystalline silicon film 3 is oxidized to form a silicon oxide film 5 to be a gate insulating film later.
- This oxidation step is preferably performed in saturated steam in addition to the oxidation atmosphere.
- a gate electrode 6 is formed on the upper surface of the silicon oxide film 5. These steps form the basic part of the MOS structure. Thereafter, impurities are implanted into regions located on both sides of the gate electrode 6 on the surface of the polycrystalline silicon film 3 to form a source region and a drain region. Further, as shown in FIG. Then, a protective film 7 and a bow from the source / drain regions [source / drain electrodes 8 serving as output electrodes] are formed.
- FIG. 7 is an explanatory diagram of a laser beam irradiation device used in the irradiation step of FIG.
- the second harmonic of the Nd: YAG laser is used as the laser light in the present embodiment.
- the laser light is oscillated from the second harmonic oscillator 10 of the Nd: YAG laser.
- the wavelength of the laser light in the present embodiment is 532 nm.
- the oscillated laser light passes through a variable attenuator 11 and a linear beam shaping optical system 14 as shown by an arrow 42, and is applied to a target 13 arranged on a moving stage 12.
- the laser light is adjusted to a predetermined intensity by the real attenuator 11 and converted into a linear beam profile by the linear beam shaping optical system 14.
- the moving stage 12 is configured so that the target 13 can move relative to the laser beam.
- the laser heat treatment is performed on the target 13 using such an apparatus.
- FIG. 8A and FIG. 8B are schematic diagrams illustrating the manner in which the amorphous silicon film is irradiated with laser light to melt the amorphous silicon film.
- the laser beam is converted into a linear beam laser beam 16 by a condenser lens 15 formed at the output of the linear beam shaping optical system (see FIG. 7).
- the linear laser light 16 is applied to the main surface of the amorphous silicon film 2.
- the distribution of the energy density in the width direction of the laser beam is, for example, a Gaussian distribution.
- the energy density of the focused laser light is greatest at the center in the width direction as shown in the laser light profile 30. The energy density gradually decreases from the center to the outside.
- the laser beam 16 used for irradiation a laser beam having an energy density gradient of at least 3 (mj / cm 2 ) // m or more in the width direction is used.
- the energy density is constant in the longitudinal direction of the laser light 16.
- the irradiated laser light has a so-called top flat shape.
- the amorphous silicon film 2 When the amorphous silicon film 2 is irradiated with the second harmonic of the Nd: YAG laser, the amorphous silicon film 2 is heated almost uniformly in the thickness direction because the absorption coefficient of the amorphous silicon for the second harmonic is small. You. In the width direction of the laser beam 16, as shown in the temperature distribution curve 35, the position corresponding to the position where the energy density in the laser beam profile 30 is the highest has the highest temperature, and the width direction of the laser beam 16 is Gradually along The temperature will be lower. Therefore, as shown in FIG. 8B, the amorphous silicon film 2 formed on the insulating substrate is almost uniformly melted as a whole in the depth direction to form a fused portion 20.
- a fusion part 20 is formed along a linear beam. That is, the melted portion 20 is formed along the region corresponding to the portion where the energy density of the laser beam profile 30 is the highest.
- FIG. 9 is an explanatory diagram when irradiating the amorphous silicon film 2 with a pulsed laser beam.
- the amorphous silicon film 2 moves in the direction of arrow 43 together with the insulating substrate 1 by moving the moving stage.
- the irradiation position of the laser beam is constant.
- the irradiation of the laser beam is performed while moving the moving stage in the width direction of the linear beam.
- laser light irradiation is performed while moving the moving stage in the direction of arrow 43.
- the laser light profile 30 indicates the energy density in the irradiation of the nearest laser light.
- the laser light profile 31 and the laser light profile 32 indicate the energy density distributions that have been sequentially irradiated with laser light in the past.
- the laser beam is irradiated while being shifted by a certain distance in the width direction of the linear beam. If the distance of one movement is longer than the width of the linear beam, the same spot will be irradiated with laser light only once.
- the moving distance one time shorter than the width of the linear beam it is possible to irradiate the laser beam to the same portion several times as shown in FIG. It can be continuously polycrystallized.
- by irradiating the pulsed laser beam while moving it is possible to convert a certain region of the amorphous silicon film into a polycrystalline silicon film as a whole.
- FIGS. 10A and 10B are cross-sectional views illustrating how molten silicon is cooled and solidified to become polycrystalline.
- FIG. 10A is an explanatory diagram in a case where laser light irradiation according to the present invention is performed. As shown in FIG. 8B, the amorphous silicon film 2 on the insulating substrate melts almost uniformly over the entire thickness direction. Since the temperature difference between the depth direction of the amorphous silicon film 2 and the longitudinal direction of the linear beam is small, the crystal growth is performed in the direction in which the laser light relatively moves, that is, the lateral growth (one-dimensional Growth).
- the growing crystal grain grows in the lateral direction indicated by arrow 45, that is, in the direction parallel to the main surface of insulating substrate 1 in the longitudinal direction.
- a polycrystalline silicon film having excellent crystallinity can be obtained over the entire depth direction without depending on the depth direction.
- FIG. 10B is an explanatory diagram of crystal growth when laser light irradiation is performed based on the conventional technique.
- laser heat treatment was performed by a linear beam using an excimer laser (a typical excimer laser is a XeCl laser having a wavelength of 308 nm).
- excimer laser a typical excimer laser is a XeCl laser having a wavelength of 308 nm.
- most of the laser light is absorbed in the vicinity of the surface of the amorphous silicon film where the absorption coefficient of amorphous silicon for the laser light is very large. Therefore, the crystal grows in the thickness direction of the amorphous silicon film because the temperature near the surface of the amorphous silicon film is high while the temperature below the amorphous silicon film is low.
- the temperature distribution is generated in the thickness direction of the amorphous silicon film 2, as shown by the arrow 44, the temperature distribution is opposite from the side of the insulating substrate 1 where the temperature is relatively low.
- the crystal grows toward the side. Therefore, the more excellent the polycrystal is, the closer to the surface of the amorphous silicon film.
- the portion that will later become the MOS interface is located inside the amorphous silicon film 2, the portion with poor crystallinity becomes the semiconductor layer.
- excellent crystal grains whose crystallinity does not depend on the thickness direction of the converted polycrystalline silicon film can be formed.
- the energy density gradient of the laser light irradiated on the amorphous silicon film is not only the energy of the laser light but also the width of the laser light. It changes depending on the position in the direction. Observation of the shape of the crystal grains of the manufactured polycrystalline silicon film showed that when the energy density gradient was 3 (mj / cm 2 ) / ⁇ m or more, the growth of the crystal grains was largely biased in the horizontal direction. I found out.
- FIG. 11 shows a plan view of a crystal grain when a large lateral growth occurs.
- the direction indicated by arrow 50 is the longitudinal direction of the linear beam
- the direction indicated by arrow 51 is the width direction of the linear beam.
- the laser light is emitted while relatively moving in the direction shown by arrow 52.
- Each crystal grain 21 grows in the horizontal direction, that is, in the direction of arrow 51.
- large crystal grains having a particle size of about several ⁇ were obtained.
- the lateral length 25 in the growth direction of the crystal grain 21 is at least twice the length 26 in the direction perpendicular to the growth direction, and the longitudinal direction of the crystal grain 21 is in the width direction of the linear beam (moving stage).
- a polycrystalline silicon crystal row that is parallel to the moving direction could be obtained.
- a semiconductor film having high mobility of electrons or holes can be provided.
- a semiconductor film having high mobility in the longitudinal direction of the crystal grains 21 can be provided.
- a polycrystalline silicon film formed by such a manufacturing method is oxidized on its surface in a saturated steam atmosphere at a pressure of 20 atm (2.026 MPa) and a temperature of 600 ° C. to form a gate insulating film.
- a method of oxidizing the surface of a polycrystalline silicon film in a saturated steam atmosphere to form a silicon oxide film is referred to as an “HPA method”.
- FIG. 12 shows an enlarged cross-sectional view near the MOS interface in an MS-FET manufactured using the method for manufacturing a semiconductor device according to the present invention.
- a silicon oxide film 5 is formed below the gate electrode 6, and a polycrystalline silicon film 3 is formed thereunder.
- FIG. 12 schematically shows the crystal grains 21 that have grown inside the polycrystalline silicon film 3.
- a source / drain region 22 is formed on the upper surface of the polycrystalline silicon film 3 and beside a region which becomes a shadow when the gate electrode 6 is projected onto the polycrystalline silicon film 3.
- the source / drain regions 22 are formed on both left and right sides.
- On the side of the gate electrode 6, a source 'drain electrode 8 for obtaining conduction with the source' drain region 22 is formed.
- the thin film transistor moves so that the moving direction of the moving stage (the width direction of the linear beam) is parallel to the direction connecting the source region and the drain region, as indicated by an arrow 46. While irradiating. Therefore, the crystal grains grow so that the longitudinal direction of the crystal grains is parallel to the direction connecting the source region and the drain region indicated by arrow 46. Further, in the thickness direction of the polycrystalline silicon film 3, the polycrystalline silicon film in which the shape of the crystal grains is substantially uniform without forming the disorder of the crystal grains is formed. When the MOS-FET is driven, electrons or holes move between the source and drain regions 22 in the direction indicated by the arrow 46.
- FIG. 13 shows an n-channel thin film transistor manufactured by a manufacturing method based on a conventional technique.
- 7 shows a graph comparing mobility among electric characteristics of n-channel thin film transistors manufactured by a manufacturing method according to the present invention.
- a manufacturing method based on the conventional technology a method of forming polycrystalline silicon using an excimer laser in an irradiation step is used.
- the horizontal axis indicates the method of manufacturing the gate insulating film and the thickness formed by each method
- the vertical axis indicates the mobility of the thin film transistor manufactured by each method.
- This is a thin film transistor in which a silicon oxide film is formed only by the point force HPA method on the rightmost side on the horizontal axis.
- the manufacturing method (method using YAG2 ⁇ laser annealing) in the present embodiment has higher mobility than the manufacturing method based on the conventional technology (method using excimer laser annealing).
- FIG. 14 shows a graph comparing threshold voltage among the electrical characteristics of the thin film transistor manufactured by the manufacturing method based on the conventional technology and the thin film transistor manufactured by the manufacturing method based on the present invention.
- the horizontal axis shows the thickness of the formed gate insulating film, and the vertical axis shows the threshold voltage.
- Each manufacturing method is the same as the manufacturing method shown in FIG.
- the leftmost point on the horizontal axis is a thin film transistor in which a silicon oxide film is formed by performing only the method ⁇ . It can be seen that the manufacturing method (method using YAG2 ⁇ laser annealing) in the present embodiment has lower threshold voltage and lower value voltage than the manufacturing method based on the conventional technology (method using excimer laser annealing).
- a thin film transistor having high mobility can be provided. Further, a thin film transistor having a low threshold voltage can be provided. It is presumed that these effects can be obtained due to the excellent shape and size of crystal grains caused by the difference in the crystal growth direction as described above. In particular, since the longitudinal direction of the crystal grains is parallel to the direction of the source region and the drain region, a region sandwiched between the source region and the drain region forms a high-performance thin film transistor having few crystal boundaries and high mobility. It is thought that we can do it. Thus, the manufacturing method according to the present invention can provide a semiconductor device having excellent transistor characteristics.
- FIGS. 13 and 14 a semiconductor device according to the second embodiment of the present invention is described. The manufacturing method will be described.
- a polycrystalline silicon film is formed using a second harmonic oscillator of a Nd: YAG laser having a wavelength of 532 nm as a laser oscillator.
- a method of oxidizing the surface of the polycrystalline silicon film to form a silicon oxide film in a saturated steam atmosphere at a temperature of 500 ° C. and a pressure of 20 atm was first used.
- the silicon oxide having a thickness of 35 nm is formed by LPCVD until a predetermined thickness is reached.
- the films were laminated.
- An n-channel thin film transistor using this silicon oxide film as a gate insulating film was manufactured.
- a polycrystalline silicon surface is oxidized to form an oxide film having a thickness of 33 nm, and then a silicon oxide film having a thickness of 1 Onm is formed by an LPC VD method. Were laminated.
- FIG. 13 shows the mobility of each semiconductor device.
- the horizontal axis in Fig. 13 shows the configuration of the gate insulating film, each of which was formed in order from the left to a thickness of 58 nm by the LPCVD method. 35 ⁇ m layer, HPA method for 75 minutes, 33 nm layer and LPCVD method for 1 Onm layer, HPA method only for 75 minutes, thin film transistor with 33 nm thick silicon oxide film And show.
- the manufacturing method according to the present invention (the method of performing YAG 2 ⁇ laser annealing), a decrease in the mobility is not observed even if a large amount of the ⁇ ⁇ method is used, and a thin film transistor having a high mobility can be provided.
- FIG. 14 is a graph showing the threshold voltage of each semiconductor device.
- the horizontal axis indicates the thickness of the gate insulating film, and the vertical axis indicates the threshold voltage.
- the manufacturing method according to the present invention has a lower threshold voltage than the manufacturing method based on the conventional technology.
- the film thickness of the gate insulating film in the semiconductor device using the conventional excimer laser annealing is taken into consideration even if the dependency on the film thickness is considered. It can be seen that the threshold and the value voltage are lower than the straight line indicating the thickness dependence.
- the source region and the drain region were set to the same potential, and a voltage was applied between these regions and the gate electrode to measure a dielectric breakdown voltage, that is, a withstand voltage.
- a dielectric breakdown voltage that is, a withstand voltage.
- silicon oxide is further stacked by a chemical vapor deposition method, so that the MOS interface is reduced.
- a silicon oxide film having a required thickness can be formed in a short time while maintaining a clean state.
- a third harmonic oscillator of a Nd: YAG laser is used instead of the second harmonic oscillator of a Nd: YAG laser in the irradiation step of the first embodiment.
- the amorphous silicon film was irradiated with laser light.
- Third harmonic oscillator The wavelength of the oscillated laser light is 355 nm.
- Embodiments other than the laser beam to be applied are the same as those in the first embodiment, such as the optical system of the laser beam and the application of the laser beam while moving the insulating substrate and the amorphous silicon film.
- the surface was oxidized in a saturated steam atmosphere at a pressure of 20 atm and a temperature of 600 ° C. to form a gate insulating film.
- a thin film transistor having the gate insulating film was manufactured and a performance test was performed.
- a high performance thin film transistor was obtained as in the case of the thin film transistor manufactured by irradiating the laser light having a wavelength of 532 nm in the first embodiment.
- crystal grains grown in the lateral direction can be obtained. Can be obtained.
- a titanium sapphire laser oscillator was used instead of the second harmonic oscillator of the YAG laser.
- This laser oscillating device is a tunable oscillating device with a wavelength of 700 nm
- Embodiments other than the laser beam to be irradiated are the same as those in the first embodiment, such as irradiating the laser beam while moving the optical system of the laser beam and the insulating substrate and the amorphous silicon film.
- a thin film transistor in which a gate insulating film is formed by oxidizing the surface of polycrystalline silicon in a saturated steam atmosphere at a pressure of 20 atm and a temperature of 600 ° C. is manufactured, and a performance test is performed. Done.
- This thin film transistor also has the wave form in the first embodiment.
- a high-performance thin film transistor was obtained in the same manner as a thin film transistor manufactured by irradiating a laser beam having a length of 532 nm.
- the wavelength of the laser beam by setting the wavelength of the laser beam to be applied to at least 532 nm or more and 800 nm or less, crystal grains grown in the lateral direction can be obtained. Can be obtained. Also, from the fact that the excimer laser used in the conventional technique (for example, a XeCl laser having a wavelength of 308 nm) does not show any lateral growth, and the results of Embodiment 3 and this embodiment show that the laser By setting the wavelength to 350 nm or more and 800 nm or less, it is possible to obtain crystal grains grown in the lateral direction, and to obtain a high-performance thin film transistor.
- the excimer laser used in the conventional technique for example, a XeCl laser having a wavelength of 308 nm
- the surface of the polycrystalline silicon film was oxidized in a saturated steam atmosphere at a temperature of 500 ° C. and a pressure of 20 atm to form a gate insulating film.
- the formation speed of the oxide film is considerably lower than that in the case of Embodiment 1 where the oxidation conditions are 600 ° C. and 20 atm, and a gate insulating film having a predetermined thickness can be obtained.
- the processing time has increased. Therefore, the temperature of the oxidation step of oxidizing the surface of the polycrystalline silicon film in an atmosphere containing water vapor is preferably 600 ° C. or higher.
- a thin film transistor having the same performance as the thin film transistor in the first embodiment was obtained.
- a high-performance thin film transistor can be obtained by setting the temperature in the oxidation step to at least 500 ° C. to 600 ° C.
- the sixth embodiment as in the first embodiment, in the oxidation step after forming the polycrystalline silicon film using the second harmonic oscillation device of the Nd: YAG laser having a wavelength of 532 nm.
- the surface of the polycrystalline silicon film was oxidized in a saturated steam atmosphere at a temperature of 650 ° C. and a pressure of 10 atm (1.013 MPa) to form a gate insulating film.
- the performance of the thin film transistor obtained by this method is the same as that of the laser according to Embodiment 1.
- the same results as in the case of the annealing conditions of a temperature of 600 ° C and a pressure of 20 atm were obtained.
- the temperature in the oxidation step be 500 ° C. or more and 650 ° C. or less.
- the oxidation step of oxidizing the surface of the polycrystalline silicon film in an atmosphere containing water vapor has a temperature of 500 ° C or more and 650 ° C or more.
- the present invention can be applied to a method for manufacturing a semiconductor device.
- it can be advantageously applied to a method for manufacturing a thin film semiconductor.
Landscapes
- Recrystallisation Techniques (AREA)
- Thin Film Transistor (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/531,991 US20060046363A1 (en) | 2003-09-05 | 2004-08-31 | Process for producing semiconductor device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003-314245 | 2003-09-05 | ||
| JP2003314245A JP4350465B2 (ja) | 2003-09-05 | 2003-09-05 | 半導体装置の製造方法 |
Publications (1)
| Publication Number | Publication Date |
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| WO2005024924A1 true WO2005024924A1 (ja) | 2005-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2004/012537 Ceased WO2005024924A1 (ja) | 2003-09-05 | 2004-08-31 | 半導体装置の製造方法 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20060046363A1 (ja) |
| JP (1) | JP4350465B2 (ja) |
| CN (1) | CN1717781A (ja) |
| WO (1) | WO2005024924A1 (ja) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1167758A (ja) * | 1997-08-19 | 1999-03-09 | Ishikawajima Harima Heavy Ind Co Ltd | 半導体膜の成形方法及び半導体基板の製造方法 |
| JP2000286195A (ja) * | 1999-03-31 | 2000-10-13 | Mitsubishi Electric Corp | レーザ熱処理方法、レーザ熱処理装置および半導体デバイス |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2564725B2 (ja) * | 1991-12-24 | 1996-12-18 | 株式会社半導体エネルギー研究所 | Mos型トランジスタの作製方法 |
| TW279275B (ja) * | 1993-12-27 | 1996-06-21 | Sharp Kk | |
| US5880041A (en) * | 1994-05-27 | 1999-03-09 | Motorola Inc. | Method for forming a dielectric layer using high pressure |
| EP0751559B1 (en) * | 1995-06-30 | 2002-11-27 | STMicroelectronics S.r.l. | Process for forming an integrated circuit comprising non-volatile memory cells and side transistors and corresponding IC |
| JP3729955B2 (ja) * | 1996-01-19 | 2005-12-21 | 株式会社半導体エネルギー研究所 | 半導体装置の作製方法 |
| JP3645379B2 (ja) * | 1996-01-19 | 2005-05-11 | 株式会社半導体エネルギー研究所 | 半導体装置の作製方法 |
| US5985740A (en) * | 1996-01-19 | 1999-11-16 | Semiconductor Energy Laboratory Co., Ltd. | Method of manufacturing a semiconductor device including reduction of a catalyst |
| US5888858A (en) * | 1996-01-20 | 1999-03-30 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device and fabrication method thereof |
| US6063654A (en) * | 1996-02-20 | 2000-05-16 | Semiconductor Energy Laboratory Co., Ltd. | Method of manufacturing a thin film transistor involving laser treatment |
| TW445545B (en) * | 1999-03-10 | 2001-07-11 | Mitsubishi Electric Corp | Laser heat treatment method, laser heat treatment apparatus and semiconductor device |
-
2003
- 2003-09-05 JP JP2003314245A patent/JP4350465B2/ja not_active Expired - Fee Related
-
2004
- 2004-08-31 US US10/531,991 patent/US20060046363A1/en not_active Abandoned
- 2004-08-31 WO PCT/JP2004/012537 patent/WO2005024924A1/ja not_active Ceased
- 2004-08-31 CN CNA2004800014920A patent/CN1717781A/zh active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1167758A (ja) * | 1997-08-19 | 1999-03-09 | Ishikawajima Harima Heavy Ind Co Ltd | 半導体膜の成形方法及び半導体基板の製造方法 |
| JP2000286195A (ja) * | 1999-03-31 | 2000-10-13 | Mitsubishi Electric Corp | レーザ熱処理方法、レーザ熱処理装置および半導体デバイス |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005085886A (ja) | 2005-03-31 |
| JP4350465B2 (ja) | 2009-10-21 |
| CN1717781A (zh) | 2006-01-04 |
| US20060046363A1 (en) | 2006-03-02 |
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