Source: http://www.google.com/patents/US6002101?dq=6680675
Timestamp: 2015-01-29 18:28:44
Document Index: 146110577

Matched Legal Cases: ['art 1', 'Application No. 2', 'Application No. 2', 'Application No. 3', 'Application No. 3', 'Application No. 64', 'Application No. 64', 'art 1']

Patent US6002101 - Method of manufacturing a semiconductor device by using a homogenized ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA method of manufacturing a semiconductor device by emitting a laser beam from an excimer laser, modifying an energy distribution by passing the beam through a lateral flyeye lens followed by a vertical flyeye lens, condensing the laser beam in two perpendicular sections by two cylindrical lenses to...http://www.google.com/patents/US6002101?utm_source=gb-gplus-sharePatent US6002101 - Method of manufacturing a semiconductor device by using a homogenized rectangular laser beamAdvanced Patent SearchPublication numberUS6002101 APublication typeGrantApplication numberUS 08/956,438Publication dateDec 14, 1999Filing dateOct 23, 1997Priority dateJun 26, 1992Fee statusPaidAlso published asCN1076864C, CN1087750A, CN1108225C, CN1128193A, CN1139105C, CN1214450C, CN1216404C, CN1284742A, CN1350322A, CN1414604A, CN1414615A, CN1921069A, CN1921069B, US5858473, US5897799, US5968383, US6440785, US6991975, US7985635, US20060194377Publication number08956438, 956438, US 6002101 A, US 6002101A, US-A-6002101, US6002101 A, US6002101AInventorsShunpei Yamazaki, Hongyong Zhang, Hiroaki IshiharaOriginal AssigneeSemiconductor Energy Laboratory Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (58), Non-Patent Citations (34), Referenced by (56), Classifications (46), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetMethod of manufacturing a semiconductor device by using a homogenized rectangular laser beamUS 6002101 AAbstract A method of manufacturing a semiconductor device by emitting a laser beam from an excimer laser, modifying an energy distribution by passing the beam through a lateral flyeye lens followed by a vertical flyeye lens, condensing the laser beam in two perpendicular sections by two cylindrical lenses to give the beam a rectangular shape, where the longer side can be in excess of 10 cm, then scanning the beam with a single direction over a semiconductor device.
What is claimed is: 1. A method of manufacturing a semiconductor device having a semiconductor layer comprising the steps of:emitting a laser beam having a cross section with a width and a length; homogenizing an energy distribution of said laser beam in a widthwise direction of the cross section using a lateral flyeye lens; homogenizing an energy distribution of said laser beam in a lengthwise direction of the cross section by using a vertical flyeye lens; condensing the laser beam after passing through said lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; condensing said laser beam after passing through said first vertical flyeye lens only in the lengthwise direction by using a second cylindrical convex lens; condensing the laser beam after passing through said first and second cylindrical convex lenses only in said widthwise direction; and irradiating a semiconductor layer with the laser beam after passing through said first, second and third cylindrical convex lenses, wherein said third cylindrical convex lens is located distant from said first cylindrical convex lens by a distance larger than focal length of said first cylindrical convex lens; scanning said semiconductor layer with the condensed laser beam condensed by said third cylindrical convex lens by relatively moving said semiconductor layer with respect to said condensed laser beam in a direction along a widthwise direction of the cross section. 2. A method according to claim 1 wherein said semiconductor layer is annealed by said laser beam condensed by said third cylindrical convex lens.
3. A method of manufacturing a semiconductor device comprising the steps of:emitting a laser beam having a first cross section; homogenizing an energy density of said laser beam in a widthwise direction of the cross section using a lateral flyeye lens; condensing the laser beam at passing through the lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; condensing the laser beam after passing through said first cylindrical convex lens only in the widthwise direction using a second cylindrical convex lens; irradiating a semiconductor layer with the laser beam having passed through said second cylindrical convex lens, wherein said second cylindrical convex lens is distant from said first cylindrical convex lens by a distant larger than a focal length of said first cylindrical convex lens; scanning said semiconductor layer with laser beam by relatively moving said semiconductor layer with respect to said condensed laser beam in a direction along a widthwise direction of the cross section. 4. A method according to claims 1 or 3 wherein said laser beam is an excimer laser beam.
5. A method according to claims 1 or 3 wherein the cross section of said laser beam has a rectangular shape.
6. A method of manufacturing a semiconductor device comprising the steps of:emitting a laser beam having a first cross section; homogenizing an energy density of said laser beam in a widthwise direction of the cross section using a lateral flyeye lens; condensing the laser beam after passing through the lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; condensing the laser beam after passing through said first cylindrical convex lens only in the widthwise direction using a second cylindrical convex lens; irradiating a semiconductor layer with the laser beam having passed through said second cylindrical convex lens, wherein a focal length F of the second cylindrical convex lens satisfies the following condition: 1/F=1/(an optical path length between the focus of the first cylindrical convex lens and the second cylindrical convex lens)+1/(an optical path length between the second cylindrical convex lens and the semiconductor layer); scanning said semiconductor layer with the condensed laser beam condensed by said second cylindrical convex lens by relatively moving said semiconductor layer with respect to said condensed laser beam in a direction along a widthwise direction of the cross section. 7. A method of manufacturing a semiconductor device comprising the steps of:emitting a laser beam having a cross section perpendicular to a propagation thereof; homogenizing an energy distribution of said laser beam in a widthwise direction of the cross section by using a lateral flyeye lens; condensing the laser beam having passed through the lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; condensing the laser beam having passed through the first cylindrical convex lens only in the widthwise direction by using a second cylindrical convex lens; and irradiating a semiconductor layer with the laser beam condensed by said second cylindrical convex lens; wherein a magnification M satisfies the following relation: M=(an optical path length between the focus of said first cylindrical convex lens and the second cylindrical convex lens)/(an optical path length between the second cylindrical convex lens and the semiconductor layer); scanning said semiconductor layer with the condensed laser beam by relatively moving said semiconductor layer with respect to said condensed laser beam in a direction along a widthwise direction of the cross section. 8. A method of manufacturing a semiconductor device having a semiconductor layer comprising the steps of:emitting a laser beam having a rectangular cross section perpendicular to a propagation thereof; modifying an energy distribution of said laser beam in a widthwise direction of the cross section by using a lateral flyeye lens; condensing the laser beam having passed through said lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; directing said laser beam having passed through said first cylindrical convex lens toward a semiconductor layer by using a mirror; condensing said laser beam in said widthwise direction by using a second cylindrical convex lens, said second cylindrical convex lens being located on an optical path between said mirror and said semiconductor layer; and irradiating said semiconductor layer with said laser beam having passed through said second cylindrical convex lens, wherein a distance X3 between a focus of said first cylindrical convex lens and the mirror, a distance X4 between the mirror and said second cylindrical convex lens, a distance X5 between said second cylindrical convex lens and said semiconductor layer satisfy the following conditions; M=(X3 +X4)/X5 where M is a magnification, and 1/F=1/(X3 +X4)+1/X5, F is a focal distance of the second cylindrical convex lens. 9. A method of manufacturing a semiconductor device comprising the steps of:emitting a laser beam having a rectangular cross section perpendicular to a propagation thereof; modifying an energy distribution of said laser beam in a widthwise direction of the cross section by using a lateral flyeye lens; condensing the laser beam having passed through said lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; directing said laser beam having passed through said first cylindrical convex lens toward a semiconductor layer by using a mirror; condensing said laser beam in said widthwise direction by using a second cylindrical convex lens, said second cylindrical convex lens being located on an optical path between said mirror and said semiconductor layer; and irradiating said semiconductor layer with said laser beam having passed through said second cylindrical convex lens, wherein a distance X3 between a focus of said first cylindrical convex lens and the mirror, a distance X4 between the mirror and said second cylindrical convex lens, a distance X5 between said second cylindrical convex lens and said semiconductor layer satisfy the following conditions; M=(X3 +X4)X5 where M is a magnification; scanning said semiconductor layer with the condensed laser beam by relatively moving said semiconductor layer with respect to said condensed laser beam in a direction along a widthwise direction of the cross section. 10. A method according to claims 3, 6, 7, 8, or 9 wherein said semiconductor layer is annealed by the laser beam condensed by said second cylindrical convex lens.
11. A method of manufacturing a semiconductor device comprising the steps of:emitting a laser beam having a rectangular cross section perpendicular to a propagation thereof; modifying an energy distribution of said laser beam in a widthwise direction of the cross section by using a lateral flyeye lens; condensing the laser beam having passed through said lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; directing said laser beam having passed through said first cylindrical convex lens toward a semiconductor layer by using a mirror; condensing said laser beam in said widthwise direction by using a second cylindrical convex lens, said second cylindrical convex lens being located on an optical path between said mirror and said semiconductor film; and irradiating said semiconductor layer with said laser beam having passed through said second cylindrical convex lens, wherein a distance X3 between a focus of said first cylindrical convex lens and the mirror, a distance X4 between the mirror and said second cylindrical convex lens, a distance X5 between said second cylindrical convex lens and said object satisfy the following conditions; 1/F=1/(X3 +X4)+1/X5, F is a focal distance of the second cylindrical convex lens; scanning said semiconductor layer with the condensed laser beam by relatively moving said semiconductor layer with respect to said condensed laser beam in a direction along a widthwise direction of the cross section. 12. A method of manufacturing a semiconductor device having a semiconductor layer comprising the steps of:emitting a laser beam having a cross section with a width and a length; modifying an energy distribution of said laser beam in a widthwise direction of the cross section using a lateral flyeye lens; modifying an energy distribution of said laser beam in a lengthwise direction of the cross section by using a vertical flyeye lens; condensing the laser beam after passing through said lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; condensing said laser beam after passing through said first vertical flyeye lens only in the lengthwise direction by using a second cylindrical convex lens; condensing the laser beam after passing through said first and second cylindrical convex lenses only in said widthwise direction; and irradiating a semiconductor layer with the laser beam after passing through said first, second and third cylindrical convex lenses, wherein said third cylindrical convex lens is located distant from said first cylindrical convex lens by a distance larger than focal length of said first cylindrical convex lens; scanning said semiconductor layer with the condensed laser beam condensed by said third cylindrical convex lens by relatively moving said semiconductor layer with respect to said condensed laser beam in a direction along a widthwise direction of the cross section. 13. A method of manufacturing a semiconductor device comprising the steps of:emitting a laser beam having a first cross section; modifying an energy density of said laser beam in a widthwise direction of the cross section using a lateral flyeye lens; condensing the laser beam after passing through the lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; condensing the laser beam after passing through said first cylindrical convex lens only in the widthwise direction using a second cylindrical convex lens; irradiating a semiconductor layer with the laser beam having passed through said second cylindrical convex lens, wherein said second cylindrical convex lens is distant from said first cylindrical convex lens by a distant larger than a focal length of said first cylindrical convex lens; scanning said semiconductor layer with laser beam by relatively moving said semiconductor layer with respect to said condensed laser beam in a direction along a widthwise direction of the cross section. 14. A method of manufacturing a semiconductor device comprising the steps of:emitting a laser beam having a first cross section; modifying an energy density of said laser beam in a widthwise direction of the cross section using a lateral flyeye lens; condensing the laser beam after passing through the lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; condensing the laser beam after passing through said first cylindrical convex lens only in the widthwise direction using a second cylindrical convex lens; irradiating a semiconductor layer with the laser beam having passed through said second cylindrical convex lens, wherein a focal length F of the second cylindrical convex lens satisfies the following condition: 1/F=1/(an optical path length between the focus of the first cylindrical convex lens and the second cylindrical convex lens)+1/(an optical path length between the second cylindrical convex lens and the semiconductor layer); scanning said semiconductor layer with the condensed laser beam condensed by said second cylindrical convex lens by relatively moving said semiconductor layer with respect to said condensed laser beam in a direction along a widthwise direction of the cross section. 15. A method of manufacturing a semiconductor device comprising the steps of:emitting a laser beam having a cross section perpendicular to a propagation thereof; modifying an energy distribution of said laser beam in a widthwise direction of the cross section by using a lateral flyeye lens; condensing the laser beam having passed through the lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; condensing the laser beam having passed through the first cylindrical convex lens only in the widthwise direction by using a second cylindrical convex lens; and irradiating a semiconductor layer with the laser beam condensed by said second cylindrical convex lens; wherein a magnification M satisfies the following relation: M=(an optical path length between the focus of said first cylindrical convex lens and the second cylindrical convex lens)/(an optical path length between the second cylindrical convex lens and the semiconductor layer); scanning said semiconductor layer with the condensed laser beam by relatively moving said semiconductor layer with respect to said condensed laser beam in a direction along a widthwise direction of the cross section. 16. A method of manufacturing a semiconductor device having a semiconductor layer comprising the steps of:emitting a laser beam having a cross section with a first width and a first length; modifying an energy distribution of said laser beam in a widthwise direction of the cross section using a lateral flyeye lens; modifying an energy distribution of said laser beam in a lengthwise direction of the cross section by using a vertical flyeye lens; condensing the laser beam after passing through said lateral flyeye lens only in the widthwise direction by using a first cylindrical convex lens; condensing said laser beam after passing through said first vertical flyeye lens only in the lengthwise direction by using a second cylindrical convex lens; condensing the laser beam after passing through said first and second cylindrical convex lenses only in said widthwise direction; and irradiating a semiconductor layer with the laser beam after passing through said first, second and third cylindrical convex lenses, wherein said third cylindrical convex lens is located distant from said first cylindrical convex lens by a distance larger than focal length of said first cylindrical convex lens; scanning said semiconductor layer with the condensed laser beam condensed by said third cylindrical convex lens by relatively moving said semiconductor layer with respect to said condensed laser beam in a direction along a widthwise direction of the cross section, wherein a cross section of said laser beam at said semiconductor layer has a second width which is smaller than said first width and a second length which is greater than said first length. Description
This is a Divisional application of Ser. No. 08/661,869, filed Jun. 11, 1996, which itself is a division of Ser. No. 08/245,587, filed May 18, 1994; which itself is a division of Ser. No. 08/081,696, filed Jun. 25, 1993.
SUMMARY OF THE INVENTION In a process for fabricating a semiconductor device, a deposition film is considerably damaged by processing such as ion irradiation, ion implantation, and ion doping, and is thereby impaired in crystallinity as to yield an amorphous phase or a like state which is far from being called as a semiconductor. Accordingly, with an aim to use laser annealing in activating such damaged films, the present inventors have studied extensively how to optimize the conditions of laser annealing. During the study, it has been found that the optimum condition fluctuates not only by the energy control of the laser beam, but also by the impurities being incorporated in the film and by the number of pulse shots of the laser beam being applied thereto.
irradiating laser pulses having a wavelength of 400 nm or shorter and having a pulse width of 50 nsec or less to a film comprising a Group IV element selected from the group consisting of carbon, silicon, germanium, tin and lead and having introduced thereinto an impurity ion,
wherein a transparent film having a thickness of 3 to 300 nm is provided on said film comprising the Group IV element on the way of said laser pulses to said film comprising the Group IV element, an energy density E of each of said laser pulses in unit of mJ/cm2 and the number N of said laser pulses satisfy relation log10 N≦-0.02(E-350).
The laser pulses are emitted from a laser selected from the group consisting of a KrF excimer laser, an ArF excimer laser, a XeCl excimer laser and a XeF excimer laser. The introduction of the impurity ion is carried out by ion irradiation, ion implantation or ion doping. The film comprising the Group IV element is provided on an insulating substrate, and the insulating substrate is maintained at a temperature of room temperature to 500� C. during the irradiating step.
It had been believed that the sheet resistance can be lowered by applying a laser beam having an energy density sufficiently high for activation. In the case of a film containing phosphorus as an impurity, this tendency can be certainly observed. However, in a film containing boron as an impurity, the film undergoes degradation by the irradiation of a laser of such a high energy density. Moreover, it had been taken for granted that the increase in pulsed shots reduces fluctuation in properties of the laser annealed films. However, this is not true because it was round that the morphology of the coating deteriorates with increasing number of shots to increase fluctuations in a microscopic level.
log10 N&#8806;A(E-B)
where, E (mJ/cm2) is the energy density of each of the irradiated laser pulses, and N (shots) is the number of shots of pulsed laser. The values for A and B are dependent on the impurities being incorporated in the coating. When phosphorus is present as the impurity, -0.02 for A and 350 for B are chosen, and an A of -0.02 and B of 300 are selected when boron is included as the impurity.
introducing an impurity into a semiconductor film provided on a transparent substrate; and
irradiating laser pulses having a wavelength of 400 nm or shorter and having a pulse width or 50 nsec or less to said semiconductor film through said transparent substrate,
wherein an energy density E of each of said laser pulses in unit of mJ/cm2 and the number N of said laser pulses satisfy relation log10 N≦-0.02(E-350).
FIG. 7(A) shows the introducing step, and FIG. 7(B) shows the irradiating step. Reference numeral 71 designates the transparent substrate, and 72 designates the semiconductor film.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a schematic view of a laser annealing apparatus having used in the embodiments of the present invention;
FIG. 4 is a graph showing the relation between the morphology of the silicon film obtained in an embodiment of the present invention and the applied laser energy density and the repetition times of the pulse shots;
FIGS. 5(A), 5(B), and 5(C) show a concept of an optical system of the laser annealing apparatus having used in the embodiments of the present invention;
DETAILED DESCRIPTION OF THE INVENTION The present invention is illustrated in greater detail referring to a non-limiting example below. It should be understood, however, that the present invention is not to be construed as being limited thereto.
EXAMPLE In this EXAMPLE, an impurity is introduced into a film comprising a Group IV element for imparting one of N-type conductivity and P-type conductivity thereto, and another impurity is introduced into a portion of the film with a mask for imparting the other one of the N-type conductivity and P-type conductivity to said portion. In FIG. 1 is shown schematically a laser annealing apparatus having used in the present example. A laser beam is generated in a generator 2, amplified in an amplifier 3 after traveling through full reflection mirrors 5 and 6, and then introduced in an optical system 4 after passing through full reflection mirrors 7 and 8. The initial laser beam has a rectangular beam area of about 3�2 cm2, but is processed into a long beam having a length of from about 10 to 30 cm and a width of from about 0.1 to 1 cm by the optical system 4. The maximum energy of the laser having passed through this optical system was 1,000 mJ/shot.
An optical path in the optical system 4 is illustrated in FIGS. 5(A), 5(B), and 5(C). A laser light incident on the optical system 4 passes through a cylindrical concave lens A, a cylindrical convex lens B, a fly-eye lens C provided in a lateral direction and a fly-eye lens D provided in a vertical direction. The laser light is changed from an initial gauss distribution to a rectangular distribution by virtue of the fly-eye lenses C and D. Further, the laser light passes through a cylindrical convex lenses E and F and is reflected on a mirror G (a mirror 9 in FIG. 1) and is focused on the specimen by a cylindrical lens H.
In this EXAMPLE, distances X1 and X2 indicated in FIG. 5 are fixed, and a distance X3 between a focus I of the lens E and the mirror G, distances X4 and X5 are varied to adjust a magnification M and a focal length F. That is,
M=(X3 +X4)/X5 1/F=1/(X3 +X4)+1/X5.
The initial beam is modified into a long-shaped one as above to improve processability thereof. More specifically, the rectangular beam which is irradiated onto a specimen 11 through the full reflection mirror 9 after departing the optical system 4 has a longer width as compared with that of the specimen that, as a consequence, the specimen need to be moved only along one direction. Accordingly, the stage on which the specimen is mounted and the driving apparatus 10 can be made simple structured that the maintenance operation therefor can be easily conducted. Furthermore, the alignment operation at setting the specimen can also be greatly simplified.
A 100 nm thick amorphous silicon film was deposited on a glass substrate 61 by plasma assisted CVD (chemical vapor deposition) process. The resulting film was annealed at 600� C. for 48 hours to obtain a crystallized film, and was patterned to make island-like portions 62 and 63 (FIG. 6(A)). Furthermore, a 70 nm thick silicon oxide film (a light-transmitting coating) 64 was deposited thereon by sputtering and the entire surface of the substrate was doped with phosphorus. A so-called ion doping process (FIG. 6(B)) was employed in this step using phosphine (PH3) as the plasma source and an accelerating voltage of 80 kV. Furthermore, a part of the substrate was masked 65 to implant boron by ion doping process (FIG. 6(C)). Diborane (B2 H6) was used as the plasma source in this step while accelerating at a voltage of 65 kV. More specifically, phosphorus was implanted (introduced) into the masked portions through the light-transmitting coating to obtain portion having rendered N-type conductive, while both phosphorus and boron were implanted (introduced) into the unmasked portions through the light-transmitting coating to result in a portion having rendered P-type conductive.
FIG. 2 shows a graph which relates the sheet resistance of a silicon film having doped with phosphorus ions with the energy density of the laser beam while also changing the repetition of the pulse shots. Phosphorus was incorporated into the silicon film at a dose of 2�1015 cm-2. With a laser being operated at an energy density of 200 mJ/cm2 or less, a large number of shots were necessary to activate the sheet, yet with a poor result yielding a high sheet resistance of about 10 kΩ/sq. However, with a laser beam having an energy density of 200 mJ/cm2 or higher, a sufficient activation was realized with a laser operation of from 1 to 10 shots.
In FIG. 3 is shown the results for laser activating a silicon film doped with boron ions at a dose of 4�1015 cm-2. In this case again, activation could be conducted only insufficiently with an energy density of 200 mJ/cm2 or lower that a large number of pulse shots was required for sufficient activation. With a laser beam operated at an energy density of from 200 to 300 mJ/cm2 a sufficiently low sheet resistance was obtained with 1 to 10 shots. However, with laser being operated at an energy density of 300 mJ/cm2 or higher, on the other hand, the sheet resistance was reversely elevated. In particular, contrary to the case of activating with a laser beam energy density of 200 mJ/cm2 or lower, the sheet resistance was elevated with increasing repetition of pulse shots. This phenomenon can be explained by the growth of grain boundary due to the impaired homogeneity of the film which had resulted by applying laser irradiation for too many shots.
In a practical process, the laser annealing is applied simultaneously to both P- and N-type regions as shown in FIG. 6(D). This signifies that a laser beam being irradiated at an energy density of 350 mJ/cm2 sufficiently activates the N-type region while impairing the properties of the P-type region. Accordingly, in the process according to the present example, it is preferred that the laser beam is operated in an energy density range of from 200 to 300 mJ/cm2 and more preferably, in a range of from 250 to 300 mJ/cm2. The pulse repetition is preferably in the range of from 1 to 100 pulses.
As described in the foregoing, the morphology of the deposited film is considerably influenced by laser annealing. In fact, the number of pulse shots can be related to the laser beam energy density and the film morphology as illustrated in FIG. 4. In FIG. 4, the term "Annealing Pulse" signifies the number of laser beam pulse shots. The solid circle in the figure represents the point at which a change in surface morphology was observed on a phosphorus-doped silicon, and the open circle represents the same on a boron-doped silicon. The upper region on the right hand side of the figure corresponds to a condition which yields poor morphology on the surface (rough surface), and the lower region on the left hand side of the figure corresponds to that which yields favorable morphology on the surface (smooth surface). It can be seen from the results that the phosphorus-doped silicon has a strong resistance against laser irradiation. Accordingly, the condition for conducting laser annealing without impairing the surface morphology can be read to be such which satisfies the relation:
log10 N&#8806;A(E-B),
where, E (mJ/cm2) is the energy density of the irradiated laser beam, and N (shots) is the number of shots of pulsed laser. The values for A and B are A=-0.02 and B=350 in the case phosphorus is incorporated as the impurity, and are A=-0.02 and B=300 when boron is included as the impurity.
When the morphology or the deposited film is considerably impaired, the characteristic values show large scattering due to the serious drop which occurs locally in the properties of silicon. In fact, a scattering in sheet resistance as high as 20% or even more was observed on a silicon film having a defective morphology (a rough surface). This scattering can be removed by satisfying the conditions above and by setting the laser energy density at a pertinent value.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3667832 *Jul 30, 1970Jun 6, 1972Nippon Selfoc Co LtdLight-conducting structure comprising crossed lenticular gradient index platesUS4059461 *Dec 10, 1975Nov 22, 1977Massachusetts Institute Of TechnologyMethod for improving the crystallinity of semiconductor films by laser beam scanning and the products thereofUS4309224 *Sep 25, 1979Jan 5, 1982Tokyo Shibaura Denki Kabushiki KaishaReducing resistance of polycrystalline layer by doping, heating, and applying radiation beamUS4309225 *Feb 22, 1980Jan 5, 1982Massachusetts Institute Of TechnologyMethod of crystallizing amorphous material with a moving energy beamUS4370175 *Dec 3, 1979Jan 25, 1983Bernard B. KatzSolar cells, dopes, p-n junctionUS4379727 *Jul 8, 1981Apr 12, 1983International Business Machines CorporationSemiconductors, activationUS4436557 *Feb 19, 1982Mar 13, 1984The United States Of America As Represented By The United States Department Of EnergyModified laser-annealing process for improving the quality of electrical P-N junctions and devicesUS4468855 *Aug 4, 1982Sep 4, 1984Fujitsu LimitedMethod of making aluminum gate self-aligned FET by selective beam annealing through reflective and antireflective coatingsUS4473433 *Jun 18, 1982Sep 25, 1984At&T Bell LaboratoriesHeating a strip to melting pointUS4475027 *Nov 17, 1981Oct 2, 1984Allied CorporationOptical beam homogenizerUS4484334 *Nov 17, 1981Nov 20, 1984Allied CorporationOptical beam concentratorUS4497015 *Feb 22, 1983Jan 29, 1985Nippon Kogaku K.K.Light illumination deviceUS4500365 *Feb 16, 1983Feb 19, 1985Fujitsu LimitedDoping, forming light transmitting film, and irradiationUS4546009 *May 9, 1980Oct 8, 1985Exxon Research Engineering CoGlow discharge decomposition of silaneUS4646426 *Apr 8, 1985Mar 3, 1987Fujitsu LimitedMethod of producing MOS FET type semiconductor deviceUS4662708 *Oct 24, 1983May 5, 1987Armco Inc.Optical scanning system for laser treatment of electrical steel and the likeUS4733944 *Jan 24, 1986Mar 29, 1988Xmr, Inc.Optical beam integration systemUS4769750 *Oct 14, 1986Sep 6, 1988Nippon Kogaku K. K.Illumination optical systemUS4851978 *Dec 21, 1987Jul 25, 1989Nikon CorporationIllumination device using a laserUS4943733 *Nov 15, 1989Jul 24, 1990Nikon CorporationProjection optical apparatus capable of measurement and compensation of distortion affecting reticle/wafer alignmentUS4970366 *Mar 24, 1989Nov 13, 1990Semiconductor Energy Laboratory Co., Ltd.Laser patterning apparatus and methodUS4997250 *Nov 17, 1989Mar 5, 1991General Electric CompanyFiber output coupler with beam shaping optics for laser materials processing systemUS5097291 *Apr 22, 1991Mar 17, 1992Nikon CorporationEnergy amount control deviceUS5225924 *Mar 29, 1990Jul 6, 1993Dainippon Screen Mfg. Co., Ltd.Optical beam scanning systemUS5236865 *Jun 18, 1992Aug 17, 1993Micron Technology, Inc.Method for simultaneously forming silicide and effecting dopant activation on a semiconductor waferUS5263250 *Apr 25, 1991Nov 23, 1993Canon Kabushiki KaishaMethod of manufacturing nozzle plate for ink jet printerUS5304357 *May 8, 1992Apr 19, 1994Ricoh Co. Ltd.Apparatus for zone melting recrystallization of thin semiconductor filmUS5306651 *May 10, 1991Apr 26, 1994Asahi Glass Company Ltd.Laser beam radiation to transform the non-singlecrystalline and activate the impurity ions without meltingUS5307207 *Oct 23, 1991Apr 26, 1994Nikon CorporationIlluminating optical apparatusUS5372836 *Mar 26, 1993Dec 13, 1994Tokyo Electron LimitedMethod of forming polycrystalling silicon film in process of manufacturing LCDUS5413958 *Nov 16, 1993May 9, 1995Tokyo Electron LimitedMethod for manufacturing a liquid crystal display substrateUS5424244 *Nov 4, 1992Jun 13, 1995Semiconductor Energy Laboratory Co., Ltd.Process for laser processing and apparatus for use in the sameUS5432122 *Nov 3, 1993Jul 11, 1995Gold Star Co., Ltd.Method of making a thin film transistor by overlapping annealing using lasersUS5561081 *Feb 3, 1994Oct 1, 1996Semiconductor Energy Laboratory Co., Ltd.Method of forming a semiconductor device by activating regions with a laser lightUS5708252 *Jan 22, 1996Jan 13, 1998Semiconductor Energy Laboratory Co., Ltd.Excimer laser scanning systemJPH0220681A * Title not availableJPH0273623A * Title not availableJPH0521339A * Title not availableJPH01186814A * Title not availableJPH01239837A * Title not availableJPH01241862A * Title not availableJPH02222154A * Title not availableJPH02255292A * Title not availableJPH02294027A * Title not availableJPH03286518A * Title not availableJPH04307727A * Title not availableJPH04338631A * Title not availableJPS5532026A * Title not availableJPS5945089A * Title not availableJPS6180815A * Title not availableJPS6325933A * Title not availableJPS58127318A * Title not availableJPS58191420A * Title not availableJPS60224282A * Title not availableJPS60227484A * Title not availableJPS60245124A * Title not availableJPS60257511A * Title not availableJPS61141174A * Title not available* Cited by examinerNon-Patent CitationsReference1"Applications of Excimer Lasers in Microelectronics", Tim McGrath, Lasertechnics, Inc., Albuquerque, New Mexico, Solid State Technology/Dec. 1983, pp. 165-169.2"Crystallization of Amorphous Silicon by Excimer Laser Annealing with a Line Shape Beam Having a Gaussian Profile", Young Min Jhon et al., Jpn. J. Appl. Phys. vol. 33 (1994), pp. L1438-1441.3"Englargement of Poly-Si Film Grain Size by Excimer Laser Annealing and its Application to High-Performance Poly-Si Thin Film Transistor", Hiroyuki Kuriyama et al., Jpn. J. App. Phys., vol. 30, No. 12B, Dec., 1991, pp. 3700-3703.4"Formation of p-n Junctions and Silicides in Silicon Using a High Performance Laser Beam Homogenization System", M. Wagner et al., Applied Surface Science 43 (1989), pp. 260-263.5"Improving the Uniformity of Poly-Si Films Using a New Excimer Laser Annealing Method for Giant-Microelectronics", Hiroyuki Kuriyama et al., Jpn. J. Appl. Phys. vol. 31, Part 1, No. 12B, Dec. 1992, pp. 4450-4554.6"Lateral Grain Growth of Poly-Si Films with a Specific Orientation by an Excimer Laser Annealing Method", Hiroyuki Kuriyama et al., Jpn. J. Appl. Phys. vol. 32 (1993), Pt. 1, No. 12B, pp. 6120-6195.7"P-28: 3.7-in.-Diagonal STN-LCD with Stripe Electrode Patterns Fabricated by an Excimer-Laser Scribing System" T. Konuma et al., Semiconductor Energy Laboratory Co., Ltd., 550 . SID 93 Digest.8"Poly-Si by Excimer Laser Annealing with Solidification Process Control", Shigeru Noguchi et al., C-II, vol. J76-C-II, No. 5, 1993, pp. 241-248.9"XeC1 Excimer Laser Annealing Used to Fabricate Poly-Si TFT's", Toshiyuki Sameshima et al., Japanese Journal of Applied Physics, vol. 28, No. 10, Oct. 1989, pp. 1789-1793.10 *Applications of Excimer Lasers in Microelectronics , Tim McGrath, Lasertechnics, Inc., Albuquerque, New Mexico, Solid State Technology/Dec. 1983, pp. 165 169.11 *Crystallization of Amorphous Silicon by Excimer Laser Annealing with a Line Shape Beam Having a Gaussian Profile , Young Min Jhon et al., Jpn. J. Appl. Phys. vol. 33 (1994), pp. L1438 1441.12 *English Translation of Japanese Application No. 2 73623, Publication Date of Mar. 13, 1990.13English Translation of Japanese Application No. 2-73623, Publication Date of Mar. 13, 1990.14 *English Translation of Japanese Application No. 3 286518, Publication Date of Dec. 17, 1991.15English Translation of Japanese Application No. 3-286518, Publication Date of Dec. 17, 1991.16 *English Translation of Japanese Application No. 64 76715, Publication Date of Mar. 22, 1989.17English Translation of Japanese Application No. 64-76715, Publication Date of Mar. 22, 1989.18 *Enlargement of Poly Si Film Grain Size by Excimer Laser Annealing and its Application to High Performance Poly Si Thin Film Transistor , Hiroyuki Kuriyama et al., Jpn. J. App. Phys., vol. 30, No. 12B, Dec., 1991, pp. 3700 3703.19 *Excimer Laser Annealed Poly Crystalline Silicon TFT, Setsuo Kaneko, T. IEEE Japan, vol 110 A, No. 10, 1990, pp. 679 683.20Excimer Laser Annealed Poly-Crystalline Silicon TFT, Setsuo Kaneko, T. IEEE Japan, vol 110-A, No. 10, 1990, pp. 679-683.21 *Formation of p n Junctions and Silicides in Silicon Using a High Performance Laser Beam Homogenization System , M. Wagner et al., Applied Surface Science 43 (1989), pp. 260 263.22IEEE Transactions on Electron Devices, vol. 36, No. 12, Dec. 1989; "High-Performance TFT's Fabricated by XeC1 Excimer Laser Annealing of Hydrogenated Amorphous-Silicon Film", Kenji Sera et al.; pp. 2868-2872.23 *IEEE Transactions on Electron Devices, vol. 36, No. 12, Dec. 1989; High Performance TFT s Fabricated by XeC1 Excimer Laser Annealing of Hydrogenated Amorphous Silicon Film , Kenji Sera et al.; pp. 2868 2872.24 *Improving the Uniformity of Poly Si Films Using a New Excimer Laser Annealing Method for Giant Microelectronics , Hiroyuki Kuriyama et al., Jpn. J. Appl. Phys. vol. 31, Part 1, No. 12B, Dec. 1992, pp. 4450 4554.25 *Lateral Grain Growth of Poly Si Films with a Specific Orientation by an Excimer Laser Annealing Method , Hiroyuki Kuriyama et al., Jpn. J. Appl. Phys. vol. 32 (1993), Pt. 1, No. 12B, pp. 6120 6195.26 *P 28: 3.7 in. Diagonal STN LCD with Stripe Electrode Patterns Fabricated by an Excimer Laser Scribing System T. Konuma et al., Semiconductor Energy Laboratory Co., Ltd., 550 . SID 93 Digest.27Pennington, K.S. et al., "CCD Imaging Array Combining Fly's Eye Lens with TDI for Increasing Light-gathering Ability", IBM Technical Disclosure Bulletin, vol. 21, No. 2, Jul. 1978, pp. 857-858.28 *Pennington, K.S. et al., CCD Imaging Array Combining Fly s Eye Lens with TDI for Increasing Light gathering Ability , IBM Technical Disclosure Bulletin, vol. 21, No. 2, Jul. 1978, pp. 857 858.29 *Poly Si by Excimer Laser Annealing with Solidification Process Control , Shigeru Noguchi et al., C II, vol. J76 C II, No. 5, 1993, pp. 241 248.30Semiconductor World, Chapter 2, Active Element Array Forming Technology Annealing Apparatus, Excimer Laser Annealing Apparatus Leonix, 1993, pp. 196-197.31 *Semiconductor World, Chapter 2, Active Element Array Forming Technology Annealing Apparatus, Excimer Laser Annealing Apparatus Leonix, Oct. 1st 1992, pp. 196 197.32 *Special Article: Present Situation of Laser Processing Technique, Application of Surface Modification by CO 2 Laser, Akira Morikawa et al., Laser Group, Engineering Section, Mechatronics Apparatus Division, pp. 68 69.33Special Article: Present Situation of Laser Processing Technique, Application of Surface Modification by CO2 Laser, Akira Morikawa et al., Laser Group, Engineering Section, Mechatronics Apparatus Division, pp. 68-69.34 *XeC1 Excimer Laser Annealing Used to Fabricate Poly Si TFT s , Toshiyuki Sameshima et al., Japanese Journal of Applied Physics, vol. 28, No. 10, Oct. 1989, pp. 1789 1793.* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS6149988 *Dec 10, 1998Nov 21, 2000Semiconductor Energy Laboratory Co., Ltd.Method and system of laser processingUS6156997 *Dec 14, 1998Dec 5, 2000Semiconductor Energy Laboratory Co., Ltd.Laser processing method and laser processing apparatusUS6261856 *Dec 10, 1998Jul 17, 2001Semiconductor Energy Laboratory Co., Ltd.Method and system of laser processingUS6392810Oct 1, 1999May 21, 2002Semiconductor Energy Laboratory Co., Ltd.Laser irradiation apparatus, laser irradiation method, beam homogenizer, semiconductor device, and method of manufacturing the semiconductor deviceUS6440785 *Jul 12, 1999Aug 27, 2002Semiconductor Energy Laboratory Co., LtdMethod of manufacturing a semiconductor device utilizing a laser annealing processUS6509212Jan 26, 1999Jan 21, 2003Semiconductor Energy Laboratory Co., Ltd.Method for laser-processing semiconductor deviceUS6534744 *Jul 13, 2000Mar 18, 2003Semiconductor Energy Laboratory Co.Method for 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H01L21/84, H01L27/1214, H01L21/2022, C23C14/5813, H01L21/2026, C23C14/58European ClassificationH01L27/12T, C23C14/58, C23C14/58B2, C23C16/56, H01L21/20D2, H01L21/265A2, H01L21/268, G02B27/09S2L2, G02B27/09Legal EventsDateCodeEventDescriptionMay 18, 2011FPAYFee paymentYear of fee payment: 12May 18, 2007FPAYFee paymentYear of fee payment: 8May 20, 2003FPAYFee paymentYear of fee payment: 4Nov 12, 2002CCCertificate of correctionOct 29, 2002CCCertificate of correctionRotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services