WO2003092059A1 - Sonde de type a fenetre, dispositif de surveillance a plasma et dispositif de traitement a plasma - Google Patents
Sonde de type a fenetre, dispositif de surveillance a plasma et dispositif de traitement a plasma Download PDFInfo
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- WO2003092059A1 WO2003092059A1 PCT/JP2003/004016 JP0304016W WO03092059A1 WO 2003092059 A1 WO2003092059 A1 WO 2003092059A1 JP 0304016 W JP0304016 W JP 0304016W WO 03092059 A1 WO03092059 A1 WO 03092059A1
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- Prior art keywords
- plasma
- probe
- window
- voltage
- detection
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32917—Plasma diagnostics
- H01J37/32935—Monitoring and controlling tubes by information coming from the object and/or discharge
Definitions
- the present invention relates to a window type probe, a plasma chamber, and a plasma apparatus, and more particularly to a plasma in a plasma apparatus using a high frequency or high frequency plasma leak on a substrate.
- Windows that have difficulties in the configuration to easily detect, invert, and elaborately detect probes, plasma
- plasma processing is widely used for plasma CVD, atshing, etching, sputtering or surface coating, for example, using a plasma on a WOT substrate.
- the power of the RF power source changes the current and the plasma impedance.
- a detector is inserted into the original line.
- an object of the present invention is to directly and simply detect the state of plasma generated by application of a high frequency or high voltage. Disclosure of the invention
- FIG. 1 is a schematic configuration diagram of the present invention, and means for solving the problems in the present invention will be described with reference to FIG.
- the conductive probe 5 provided with an opening at least at the surface facing the plasma in the window probe and the opening of the self-conductive support 5 are described. It has at least a dielectric member 1 having a probe electrode 2 on one surface.
- window probe Since such a window probe is only provided on the side wall of the process chamber, there is no need to insert the probe inside the process chamber.Therefore, the presence of the window probe does not affect the state of the plasma. Without giving, it is possible to monitor the plasma with a simple configuration. .
- a potential called a potential is applied to the surface of the dielectric attachment 1 facing the plasma due to the plasma 3 ⁇ 4g in the process chamber 1, and the plasma is monitored by monitoring the 3 ⁇ 4fj at this location. Can be monitored.
- the probe 2 is shielded with the “I shield” 4 through the thread 3.
- the rinsing sound attachment 1 is made of optically transparent glass.
- the dielectric sound to be viewed 1 may be opaque, but it is preferable to use a transparent glass for the sharp, so that it is possible to optically observe the inside of the process chamber. .
- the probe electrode 2 is made of an optically transparent conductive material.
- ⁇ S may be composed of an electrically transparent conductive material.
- the present invention is characterized in that in any one of the above (1) to (4), the conductive support 5 has an opening provided as a viewing window.
- the viewing port provided in the process chamber that is, the viewing window can be used as well, and the device configuration can be hidden.
- the window probe according to any one of (1) to (5) is used, and the voltage at the output terminal of the window probe is: It is assumed that it is equipped with ⁇ word ten times.
- a voltage measuring unit for measuring a voltage is provided at an output end of the key probe, and the plasma is monitored by the voltage. Just do it.
- the voltage measuring unit uses analog / digital conversion of the voltage It shall be provided with at least a data section for deriving the average, the average voltage, the average amplitude, etc. by using the fiber section and the voltage section to comfortably observe the state of the plasma.
- a process monitor for detecting the stability of the plasma by detecting the non-change of the periodic change of the voltage detected by the voltage gradual measurement unit in the above (6) It is a bell that has a mechanism.
- the plasma 4 during the plasma process can be precisely monitored.
- an abnormal monitoring mechanism for detecting an abnormal discharge of the plasma by a change in the current detected by the light measuring section.
- the difference in plasma detected by the measurement unit causes a difference in plasma!
- the difference in plasma detected by the measurement unit causes a difference in plasma!
- the plasma processing apparatus is provided with the above-described plasma monitoring device in any one of the above (6) to (8).
- the conductive support sound attached to the opening portion is a flange portion forming a viewing window of the JS container, and the dielectric material attached to the dielectric member is attached to the dielectric member.
- the dielectric material attached to the dielectric member is attached to the dielectric member. Is a transparent glass plate that seals the flange.
- FIG. 1 is an explanatory diagram of the basic configuration of the present invention.
- FIG. 2 is a schematic configuration diagram of a plasma analyzer with a window probe according to the first embodiment of the present invention.
- FIG. 3 is a schematic configuration diagram of a window probe used in the first difficulty mode of the present invention.
- FIG. 4 is an explanatory diagram of a detection waveform of a window probe in an RF discharge.
- FIG. 5 is an explanatory diagram of the detection waveform of the window probe of which the input power is Ml at.
- FIG. 6 is an explanatory diagram of detection of a window probe of i3 ⁇ 4 which immediately cuts off the RF wonder due to a device abnormality at RF3 ⁇ 4W.
- FIG. 7 shows the detection by the window probe in the first difficulty mode of the present invention.
- FIG. 136 is an explanatory diagram of ⁇ ⁇ .
- FIG. 8 is a schematic configuration diagram of a plasma display device with an abnormality detection device according to the second embodiment of the present invention.
- FIG. 9 is an explanatory diagram of detection of a window-type probe at the time of abnormal discharge due to DC haze in the second difficult mode of the present invention.
- FIG. 10 is an explanatory diagram of the detection of the window J probe at the time of abnormal frosting due to RF competition in the second embodiment of the present invention.
- FIG. 11 is a schematic configuration diagram of a plasma processing apparatus with a different observation device according to a third difficult embodiment of the present invention.
- FIG. 12 is an explanatory diagram of an abnormal release method according to the third embodiment of the present invention.
- FIG. 13 is a schematic configuration diagram of a window probe according to the fourth embodiment of the present invention. Best mode to make invention
- FIG. 2 is a schematic configuration diagram of a plasma reactor with a probe intersecting a window in the first embodiment of the present invention.
- This plasma processing apparatus mounts a process chamber 11 having a gas inlet 12, an exhaust port 13, and a probe mounting part 14, and a Si wafer 16 disposed in the process chamber 1.
- Bottom ⁇ ⁇ 15 to be placed and inlet gas tT ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ 3 ⁇ 4 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ It is composed of a high-frequency power supply 19 that applies RF power of 13.56 MHz through an impedance 8 that is formed and a wiring 20 that performs the above 17.
- the profile attaching section 14 is composed of a flange attached to a normal viewport.
- a window probe 30 is attached to the flange attached, and the window intersecting probe 30 is attached to the window attached probe.
- the detection output is connected to a digital oscilloscope 40 via a coaxial cable.
- FIG. 3 is a schematic configuration diagram of a window probe according to the first difficult embodiment of the present invention.
- the window probe 30 is a glass plate such as an optically transparent copearl glass used for a normal viewport. 1. Polyester that covers the surface of the probe 3 ⁇ 432 and probe 3 ⁇ 4 @ 32 made of ITO etc. provided outside the plasma of the glass plate 31! It is composed of a transparent transparent film 33 of I ⁇ , an I T0 shield 34 that selectively shields the probe electrode 32, and an impedance dance ⁇ 135.
- the probe arm 32 has a peripheral opening so that it does not electrically connect with the probe mounting portion 14, and has an I ⁇ 0 shield 34 and a transparent shield.
- a small opening is provided in the rim 3 3, through which the probe 3 2 is connected to the impedance 35 by a coaxial cable ⁇
- the probe mounting portion 14 is configured to be sealed in a vacuum by using an O-ring, grease, and the like, like a normal viewport.
- the contact between the probe 32 and the coaxial cable uses, for example, a spring pin, and the I-shield 34 and the probe! (The same applies to the concubine touch with P14.)
- the window probe 30 can also function as a viewing window of the process chamber of the plasma analyzer. It is a revolutionary and great advantage. Next, the principle of plasma monitoring using this window probe will be described. Again, see Figure 2
- the plasma 21 When a reaction gas is introduced into the process chamber 11 from the gas inlet 12 and RF power is applied between the upper part 17 and the lower part 15 under a certain pressure, the plasma 21 Is generated, but ions and electrons are spread to the wall side of the process chamber 11 due to the density gradient of the generated plasma. Since the current densities of the ions and electrons that are scattered are dependent on the density of the plasma main body, an end product is installed in a part of the process chamber 11. Depending on the amount of ions or electrons flowing through the sheath formed near the surface of the paper, the potential, called the awake position, becomes more diffuse and the potential, called the awake position, becomes more diffuse. In the present invention, it is induced on the surface of the glass plate 31.
- the «position is lower than the plasma potential by the sheath potential, and the high-period ⁇ ⁇ shows a potential change synchronized with the plasma excitation period. Shows a constant potential.
- the plasma 21 is upset due to some reason; if ⁇ has an older brother, for example, in the vineyard, or in the gas pressure.
- the plasma 21 has a plasma 22
- the 4 fibers change and the ions diffuse to the wall of the process chamber in response to the change of the elder brother?
- the position of the glass plate 31 which is a dielectric material formed in the process chamber 11 also changes to i3 ⁇ 4t.
- the wall voltage ⁇ is not constant, but fluctuates in synchronization with the plasma fluctuation.
- lightning synchronized with the plasma excitation period fluctuates, and the distortion of 3 ⁇ 4 ⁇ , In other words, the peak value changes.
- the plasma changes suddenly and changes to mass or ⁇ ⁇ electrons or 3 ⁇ 4.
- the wall potential changes to the negative side.
- the potential change corresponding to the change in plasma is generated by electrostatic induction in the probe 32 provided on one side of the glass plate 31 described in the process chamber 111 which is not opposed to the plasma. Will be done.
- the probe electrode 3 2 In order for the electrode to swing completely parallel to the plasma potential, not only the excitation period but also the impedance of the probe electrode 32, which is a harmonic component, must be large.
- the ⁇ probe 30 of the present invention makes the area of the glass plate 31 facing the plasmas 21 and 22 sufficiently large.
- the impedance of the probe 3 composed of ITO does not need to be known exactly, and the probe voltage takes the maximum value when the impedance is silent, so that the probe position takes the maximum value. Adjust the dance dance as follows.
- FIG. 4 (a) shows the voltage output from the window probe 30 when the plasma is supplied stably by supplying power from the high-frequency power supply 18 to the process chamber 11.
- the horizontal axis represents time (seconds)
- the vertical axis represents voltage
- 56M Hz to Bunsun ⁇ to 1 cycle 73 nanosecond, returned ⁇ Ri in (73ns 7. 3x 10_ 8 s )
- a stable voltage is obtained and the plasma amplitude and amplitude can be measured.
- Fig. 4 (b) it is observed in the ⁇ ⁇ of the unstable ⁇ plasma. As shown in the figure, the voltage is distorted, and the peak value (peak value) changes every period. It is determined that the root is ij.
- Fig. 5 is an explanatory diagram of the detection waveform of the probe with the input power fluctuating due to the RF discharge, and the detection ⁇ also changes gradually according to the input power. ].
- the peak value at the detection ⁇ is also proportional to the RF input power, and the detection ⁇ by this window probe Are they changing in cycles?
- the swelling state and peak values reflect the characteristics of the plasma.
- Figure 6 is an explanatory diagram of the detection of a window probe in which the RF field was immediately cut off due to a device error in the RF chamber. Since the RF champion was cut off immediately, the mass or electron rapidly diffused. Since the wall potential changes to the minus side, the detected value is ⁇ 5 on the plus side.
- the window probe 30 of the present invention can capture a significant change in the ion current or the electron current that is diffused according to the change in the plasma state. In this way, it is possible to detect it easily.
- the window probe detects the plasma in advance in a stable state. This is used as the 3 ⁇ 4 ⁇ wave data.
- ⁇ f av is calculated by taking an arbitrary number of periods for the wave at an arbitrary time or number, and averaging it as one period ⁇ . (T), V av . (PP), and Vavo (m) for each.
- V av (m) and Vav (pp) V av . (M) and V avo (pp) as » and each as m and p
- Probe detection by these ⁇ , m, p? States of size »and ⁇ » can be detected.
- these values a, m, and p are set in advance to the input power of the plasma, and when the plasma input device detects the probe while the plasma input is in progress. Any time ⁇ , or every cycle, seeking therebetween flat area ⁇ f av (t), and the acid with Matoiha form of f av (0), saying ⁇ that I ⁇ is predetermined It is determined in the data section whether it is larger or smaller, and larger or smaller than a predetermined value; a warning is issued to the plasma device in the case of if ⁇ .
- the distortion rate, or Vav (PP) (m) In addition to the input of the plasma power, a warning was given that the plasma was unstable ⁇ M because the plasma may have fluctuated due to a problem with the gas ass, true. I do.
- V av (pp) when V av (pp) is simply out of the range, the impedance of the plasma 21 and the high-frequency power supply 19 may not be sufficient, or the input power of the high-frequency power supply 19 may be misaligned. If the value is smaller than the predetermined value, it means that 3 ⁇ 4 ⁇ with the plasma cannot be obtained. Therefore, a warning is issued and a control signal is issued to take ⁇ ⁇ with the plasma against the plasma surprise. Output.
- Jt ⁇ in which Vav (P P) is larger than the value obtained by 1 in advance can be judged to be a deviation of the input power applied to the high-frequency power supply 19, and a warning of a mistake is transmitted.
- the first of this invention In the case of the window type probe of the form (1), even if the plasma treatment is performed for a period of time and the thread color layer is deposited, there is no problem as long as the thread color edge layer that has been dimensionally mounted does not become thicker. Because it works without cost, the applicability to the picture of the place of the word and the place of the ⁇ g g ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ g g ⁇ ⁇ .
- FIGS. 8 to 10 a description will be given of a plasma processing apparatus according to a second embodiment of the present invention, which includes the above-described key probe and detects fluctuations, abnormalities, and the like of plasma. .
- FIG. 8 is a schematic configuration diagram of a plasma apparatus with an abnormal viewing device according to the second difficult form of the present invention. This is the same as in the case of (1), except that the detection system uses a plasma supervisor 50 instead of the digital oscilloscope 40, so that the description of the same is omitted.
- Razuma Watching Device 50 is a window.
- FIG. 9 is an explanatory diagram of a detection waveform of a window probe at the time of abnormal discharge in DC discharge according to the second embodiment, and detects abnormal discharge by measuring fluctuations of a plasma generation power supply voltage and current. In addition, the detection of an arc monitor that is performed is also shown.
- FIG. 10 is an explanatory diagram of a detection waveform of a window probe at the time of abnormal emission due to RF consideration according to the second embodiment, and an ultrasonic sensor that detects ultrasonic waves at the time of occurrence of abnormal discharge by RF plasma. Also shows the detection ⁇ .
- the present inventor has proposed that when abnormal discharge 24 occurs in plasma, ultrasonic waves (AE: acoustic emission) are generated by the plasma, and the generated AE causes the plasma; Utilizing the propagation, an AE sensor is attached to the outer wall of the plasma The location of the AE is determined by detecting the AE that has occurred. (If necessary, refer to Ki-ji No. 200—0-890.
- the detection ⁇ by the window probe shown in the upper row shows that, as in the case of the abnormal discharge caused by the DC plasma shown in Fig. 9, the trace was well traced to each furnace in the abnormal request 24, and changed negatively and rapidly. Since the wall potential has changed to the minus side, it is clear that the number of parasites has increased and the plasma has turned into a dragon.
- this window probe detects? ⁇ is the detection waveform from which the RF component has been removed.
- the detection ⁇ by the ultrasonic sensor shown in the lower part is based on the relationship between the position of the abnormality ⁇ and the propagation of the ultrasonic wave on the wall of the process chamber 111, and the detection of the window probe in the upper part ⁇ It can be confirmed that the ultrasonic wave associated with the abnormality was detected after the change in.
- Window probe 30 detection? ⁇ is input via the A / D conversion sound ⁇ 51, and the ⁇ data is input to the filter-mulli part 53, and the RF component of 13.56 MHz is passed through the mouth-pass filter. Cut and release abnormally. »Food extraction!
- the detection! ⁇ F (t) is differentiated, and the value is j8.
- the magnitude of the anomaly can be determined from the peak value V (P P).
- FIG. 11 is a schematic configuration diagram of a plasma processing apparatus with an abnormal observation device according to the third embodiment of the present invention. It is the same as the Plasma M device.
- FIG. 12 is an explanatory diagram of an abnormal discharge detection method according to the third embodiment of the present invention.
- the occurrence of an abnormal discharge is determined by the following method based on the detection ⁇ of the window probe 30 shown in FIG. At the age at which it is determined that wm2 4 has occurred
- the occurrence of the abnormality 24 caused by the AE sensor 25 to 27 can be reduced.
- the AE sensor since the occurrence of abnormal discharge is confirmed based on the detection ⁇ of the translation probe 30 and then the position specifying operation by the AE sensor is performed, the AE sensor is not wasted.
- FIG. 13 is a schematic configuration diagram of a window probe according to a fourth embodiment of the present invention.
- the ⁇ probe has the same suspension configuration as the window probe 30 shown in FIG.
- a glass plate 31 made of a transparent glass such as a glass used for a normal viewport; a probe 32 made of IT or the like provided outside the process chamber of the glass plate 31; Probe garage 3 2 Polyester! ⁇ Transparent covering film that completely covers the surface of the probe 2 3, I TO shield 3 4 provided on top of it to shield the probe mm 2, and impedance It consists of l 3 5.
- an optically transparent deposition-resistant glass plate 36 is provided closer to the plasma generation region than the glass plate 31. Accordingly, the glass constituting the window probe is provided. The generation of dirt on the surface of the plate 31 can be prevented.
- the peripheral part is opened so that the probe 3 2 does not electrically connect to the probe attaching section 14, and the ITO shield 34 and the transparent thread A small opening is provided in the membrane 33, and the probe 32 is connected to the impedance transformer 35 by a coaxial cable through the small opening.
- the probe attaching section 14 is configured to be sealed in a vacuum by using an O-ring, grease, or the like, as in a normal viewport. Since the window of the window probe and the protective glass plate 36 are all made of transparent sound, this window probe also functions as a peep window of the process chamber of the plasma and M equipment. There are significant and significant advantages that can be achieved.
- the detection sensitivity is reduced.
- a parallel flat plate plasma rinse apparatus is described as an example of a plasma flat panel apparatus, but the configuration of the plasma display apparatus is such a parallel flat plate type plasma;
- the present invention is not limited to the M apparatus, but is applied to plasma processing apparatuses having various structures.
- the window probe is provided at one location on the outer wall of the process chamber.
- the window probe may be provided at a location where the process chamber is rinsed.
- the description has been made on the assumption that the window probe is attached to the process chamber by providing an attachment portion, but it may be attached to an existing plasma processing apparatus.
- the target plasma ⁇ 3 device already has a viewing window.
- a conductive sheet such as an optically transparent IT sheet
- the window probe can be easily constructed.
- the device that measures the probe potential is a device that can measure a high voltage, for example, a digital oscilloscope having an input impedance of 50 ⁇ . It is not limited to a sampling oscilloscope, Any device that can measure can be used.
- the dielectric material for inducing the wall potential in the window probe is a flaky glass plate, but is not necessarily a fiber-like glass plate.
- a glass plate is used as a clasp to induce position in the window probe, but the glass plate is not necessarily required to be a glass plate, and may be a dielectric. Alternatively, other dielectric screens such as sapphire fiber may be used.
- the entire structure is made up of a transparent lining in order to have a window g, except for the window probe, but not all of it is made up of a transparent sound.
- the probe I may be formed of A1 or Au.
- a window probe it is not always necessary for a window probe to have the function of a viewing window, and at least one of the window intercepting probes may be formed with an opaque sound.
- the probe of the window probe does not necessarily have to be a spread electrode in a plane shape, and it goes without saying that even if the knitted dog is attached to a glass plate, it functions as a probe.
- the window probe and the plasma observation apparatus of the present invention changes in the state of the positive and negative electrodes can be confirmed by measuring the average potential of the wall potential and the potential of the potential. It is also possible to easily detect abnormalities in the ⁇ , and in particular, the window probe can function as a viewing window, and the status of the plasma display device can be automatically known, Stop or bra It is suitable for plasma processing equipment that can prevent defective products by controlling the gap.
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03747203A EP1531490A4 (en) | 2002-04-24 | 2003-03-28 | WINDOW TYPE PROBE, PLASMA MONITORING DEVICE AND PLASMA PROCESSING DEVICE |
US10/512,141 US20050194094A1 (en) | 2002-04-24 | 2003-03-28 | Window type probe, plasma monitoring device, and plasma processing device |
KR1020047016922A KR100582013B1 (ko) | 2002-04-24 | 2003-03-28 | 윈도우 타입 프로브, 플라즈마 감시장치, 및, 플라즈마처리장치 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002-122240 | 2002-04-24 | ||
JP2002122240A JP3773189B2 (ja) | 2002-04-24 | 2002-04-24 | 窓型プローブ、プラズマ監視装置、及び、プラズマ処理装置 |
Publications (1)
Publication Number | Publication Date |
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WO2003092059A1 true WO2003092059A1 (fr) | 2003-11-06 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/004016 WO2003092059A1 (fr) | 2002-04-24 | 2003-03-28 | Sonde de type a fenetre, dispositif de surveillance a plasma et dispositif de traitement a plasma |
Country Status (7)
Country | Link |
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US (1) | US20050194094A1 (ja) |
EP (1) | EP1531490A4 (ja) |
JP (1) | JP3773189B2 (ja) |
KR (1) | KR100582013B1 (ja) |
CN (1) | CN1647252A (ja) |
TW (1) | TWI256278B (ja) |
WO (1) | WO2003092059A1 (ja) |
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US7960670B2 (en) | 2005-05-03 | 2011-06-14 | Kla-Tencor Corporation | Methods of and apparatuses for measuring electrical parameters of a plasma process |
JP2005277397A (ja) * | 2004-02-26 | 2005-10-06 | Tokyo Electron Ltd | プラズマ処理装置 |
US7292045B2 (en) * | 2004-09-04 | 2007-11-06 | Applied Materials, Inc. | Detection and suppression of electrical arcing |
JP4673601B2 (ja) * | 2004-10-27 | 2011-04-20 | 東京エレクトロン株式会社 | プラズマ処理装置 |
US7334477B1 (en) * | 2004-12-22 | 2008-02-26 | Lam Research Corporation | Apparatus and methods for the detection of an arc in a plasma processing system |
JP5094002B2 (ja) | 2005-09-06 | 2012-12-12 | ルネサスエレクトロニクス株式会社 | プラズマ処理装置およびその異常放電抑止方法 |
JP2008115460A (ja) * | 2006-10-12 | 2008-05-22 | Canon Inc | 半導体素子の形成方法及び光起電力素子の形成方法 |
JP4997925B2 (ja) | 2006-11-08 | 2012-08-15 | 日新電機株式会社 | シリコンドット形成方法及び装置並びにシリコンドット及び絶縁膜付き基板の形成方法及び装置 |
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US20050194094A1 (en) | 2005-09-08 |
EP1531490A4 (en) | 2009-07-15 |
JP2003318115A (ja) | 2003-11-07 |
KR100582013B1 (ko) | 2006-05-22 |
EP1531490A1 (en) | 2005-05-18 |
TWI256278B (en) | 2006-06-01 |
JP3773189B2 (ja) | 2006-05-10 |
KR20040108751A (ko) | 2004-12-24 |
TW200306136A (en) | 2003-11-01 |
CN1647252A (zh) | 2005-07-27 |
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