EP2198668A1 - Apparatus for an irradiation unit - Google Patents
Apparatus for an irradiation unitInfo
- Publication number
- EP2198668A1 EP2198668A1 EP08802533A EP08802533A EP2198668A1 EP 2198668 A1 EP2198668 A1 EP 2198668A1 EP 08802533 A EP08802533 A EP 08802533A EP 08802533 A EP08802533 A EP 08802533A EP 2198668 A1 EP2198668 A1 EP 2198668A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reflector
- substrate
- chamber
- radiator
- infrared
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/0033—Heating devices using lamps
- H05B3/0038—Heating devices using lamps for industrial applications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/48—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating by irradiation, e.g. photolysis, radiolysis, particle radiation
- C23C16/481—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating by irradiation, e.g. photolysis, radiolysis, particle radiation by radiant heating of the substrate
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/032—Heaters specially adapted for heating by radiation heating
Definitions
- the invention relates to a device for the irradiation of at least one substrate, wherein the device has an irradiation device with at least one infrared radiator.
- a variety of processes requires vacuum for optimal conditions. For this purpose, a substrate must first be introduced into the vacuum. Often a preparatory step is then inserted before the substrate is subsequently vacuum treated.
- Typical processes are the application of coatings to various materials by means of a wide variety of processes.
- the substrates used here are metal parts or even endless metal strips, glass panes, semiconductor substrates, etc.
- Typical coating processes are chemical vapor deposition (CVD) plasma etching, sputtering via plasma coating methods, etc.
- the substrate must be specially conditioned during or after the introduction into the vacuum apparatus.
- This conditioning includes, among other things, a heating up.
- the heating takes place, for example, to avoid the harmful for the process or the vacuum occupancy of the surface with water molecules.
- the substrate is typically heated to temperatures between 140 0 C and 300 0 C, so that the water molecules can pass into the gas phase.
- the achievement of a specific substrate temperature is also a prerequisite for the optimal course of the process and must be set via the conditioning.
- Heating processes can also be used after a vacuum process.
- heating elements which have a stainless steel tube, which is electrically heated from the inside and can reach temperatures of about 600 0 C.
- Such metal heating elements have sufficient chemical resistance in vacuum, are inexpensive, have excellent properties for vacuum processes, but are extremely thermally inert and can not deliver high power due to the low maximum surface temperature. If oxygen is present in the vicinity of these bar heating elements at any time in the process, they start up and change their radiation behavior.
- infrared radiator consisting of a vacuum sealed quartz tube and heating conductors therein.
- the heating conductors are usually made of tungsten or carbon.
- Such infrared radiators are usually very fast in their thermal reaction, that is, the power is available quickly and can be controlled quickly, and achieve considerable radiation performance.
- To achieve these high radiant powers of each individual radiator quite high voltages are required for vacuum applications.
- Both rod heaters, as well as infrared heaters radiate once Their performance evenly in all directions and thus achieve only an unsatisfactory process efficiency.
- the external reflectors are usually polished sheets made of stainless steel, molybdenum or aluminum. With such external reflectors, some of the power of the radiators can be directed back to the substrate, thus increasing the efficiency. These sheets absorb some of the incident radiation and thus store large amounts of heat. Further, they often start due to residual amounts of oxygen or process gases (e.g., selenium), resulting in a great reduction of reflectivity and a strong further heating of the sheets. The consequence is also an increasing thermal inertia of the radiation source and thus of the plant, as well as a reduced efficiency.
- Reflectors made of aluminum oxide (Al 2 O 3 ) or zirconium oxide (ZrO 2 ) powder sintered onto the emitter tube are described in the prior art. These reflectors are applied directly to the radiator tube and can not oxidize. Such reflectors made of aluminum or zirconium oxide tend to break off and are thus a source of impurities. Because they are open-pore, they can bind large amounts of gases during cyclic operation and release them again during heating. Process gases, such as selenium, readily settle in the open pores and then destroy the reflection effect of the material. Their reflection effect is limited to typical values of 30%. They are therefore not necessarily used for the described applications.
- IR emitters with reflectors made of gold are known, but can not be used because the gold reflector decomposes in a vacuum due to the low ambient pressure and the high temperature of the quartz tube of the radiator that can not be cooled by an air flow here, in no time.
- EP 1 228 668 A1 describes IR radiators which are introduced into additional cladding tubes of quartz glass, these cladding tubes being sealed in a vacuum-tight manner with respect to the recipient. This makes it possible for each of the individual radiators to be operated at high voltages. In principle, with sufficient cooling, a highly efficient gold reflector can also be applied to the individual radiator.
- EP 1 071 310 A1 describes a device for the homogeneous heating of silicon wafers in a vacuum.
- a plurality of round infrared radiators is arranged in front of an external reflector and cooled by directed air flow.
- the radiator and the air cooling are separated by a window relative to the actual process chamber with its substrate.
- a chamber in which the substrate is arranged together with the infrared radiator between two reflectors.
- the reflectors consist of thin sheet metal, preferably of aluminum.
- the cooling of the reflector is achieved in that this is blackened backwards, so that radiation can be done by a heat transfer from the reflector to the cooled wall.
- Additional control of the temperature of the substrate is achieved by adding a heat-conducting gas, so that in addition to the heat transfer by radiation, heat transfer via heat conduction and free convection, the heat from the substrate reflector and radiator can be dissipated to the cooled chamber wall.
- the above devices all have the disadvantage that they have a large thermal inertia and thus are not necessarily suitable for the rapid heating and holding a sample at a defined temperature.
- the object of the invention is therefore to provide a device which avoids the disadvantages mentioned above and allows rapid heating and a subsequent long holding of the substrate at a defined temperature.
- the device according to the invention with a chamber for the irradiation of at least one substrate comprises at least one lock for introducing and removing the substrate, a substrate holder within the chamber, a vacuum pump and at least one irradiation unit for irradiating the substrate, wherein the irradiation unit has at least one infrared radiator with an integrated reflector ,
- Such a device enables the chamber to be made substantially smaller than the hitherto known chambers, since the infrared radiator is already provided with an integrated reflector, and thus can be dispensed with an external reflector and counter reflector, which usually take up a lot of space.
- each chamber which is suitable for receiving and thermally treating a substrate can serve as a chamber.
- the reflector consists of a material which, at least in the dense state, is broadband-band transparent, in particular for radiation in the near and middle infrared, but is formed as an opaque material.
- This reflector has particularly high reflectivity and has very good properties in terms of mechanical stability and vacuum compatibility.
- the reflector has a closed-pored structure. It is advantageous if a coating is applied to the back of the infrared radiator and the coating has a high absorption in the far infrared range. It has been shown that a coating comprising quartz glass is particularly suitable for this purpose.
- This material has a very high temperature resistance.
- a device according to the invention results in that, for example, the cooled vacuum chamber is designed as the only additional reflector of the device.
- the reflector described above is thus optimally suited for use in a vacuum chamber, since it is highly efficient and suitable for vacuum. It also has a minimal tendency to emit gases, as it can absorb almost none.
- the radiator is removable from the chamber.
- Figure 1 shows the axial radiation behavior of a typical IR radiator with AI2O3 coating.
- Figure 2 shows the axial radiation behavior of typical short-wave IR emitters for different types of reflectors.
- FIG. 3 shows the axial radiation behavior of typical carbon IR radiators for different reflector types.
- FIG. 4 shows a device according to the invention.
- FIG. 5 shows a further development of the device according to the invention
- thermopile sensor broadband the entire incoming radiation power. This sensor is guided in a circle around the radiator axis and thus a measured value is recorded every 5 °. The measurements are carried out in air. From these measurements, a reflectivity R of the reflector can also be calculated during operation, which is defined as
- D _ 1 _ * _ reflector is total groove ⁇ l e n total total total Re flektnr Nulzseite
- n total the number of total measurements
- n Ref the number of measurements on the reflector side.
- iN ⁇ t z ⁇ eite is the summed intensity and n Nutzse ⁇ te the number of measuring points on the useful side.
- FIG. 1 shows the measurement result for a commercial halogen round tube emitter with 180 ° coating of the tube with sprayed-on Al 2 O 3 powder as IR reflector.
- the reflectivity for this data is 32% and is even lower in vacuum, where the AI 2 O 3 is hotter due to lack of convective cooling.
- the coating is arranged in the picture above.
- FIG. 2 a number of reflector types are compared for mechanically more stable twin-tube radiators, with tungsten always being used as the heating filament.
- Line 21 -> a twin tube without reflector
- Line 22 -> a stainless steel reflector
- Line 23 -> an aluminum reflector
- Line 24 -> a reflector according to the invention on a twin pipe line 23: -> a reflector according to the invention on a twin pipe and in front of an aluminum reflector.
- Twin pipe refers to an IR lamp without reflector.
- Such a spotlight was then measured before a new high-gloss stainless steel reflector and new high-gloss aluminum reflector, in which case only over 180 ° in front of the reflector could be measured.
- an irradiation unit with a spotlight and a reflector over 360 °, as well as an irradiation unit with a spotlight and a reflector in front of a new high-gloss aluminum reflector were measured. All reflector layers are mounted in the picture above between 3 o'clock and 9 o'clock.
- the reflectivities are 50% for the pure stainless steel 22, 61% for aluminum 23, 74% for the reflector of the irradiation unit according to the invention 24 and 87% for the reflector and aluminum irradiation unit according to the invention 25. It was in the 180 ° measurements respectively l used together from the measurement without reflector. The reflectivities of the metallic reflectors are smaller than the theoretical values, since a considerable portion of the radiation is reflected back onto the radiator.
- FIG. 3 a number of reflector types are compared for mechanically more stable twin tube radiators, carbon being used as heating filament.
- the lines reflect the measurement result for different reflector types:
- Line 33 -> a reflector and aluminum reflector according to the invention.
- Twin pipe refers to an IR lamp without reflector. Such a spotlight was then measured before a new high-gloss (stainless steel) reflector and new high-gloss (aluminum) reflector, in which case only over 180 ° in front of the reflector could be measured. Furthermore, an irradiation unit with a spotlight and with a reflector over 360 °, as well as an irradiation unit with a spotlight and with a reflector in front of a new high-gloss (aluminum) reflector was measured. All reflector layers are mounted in the picture above between 3 o'clock and 9 o'clock.
- the reflectivities are 61% for pure stainless steel 32, 63% for aluminum 33, 64% for the reflector of the irradiation unit 34 according to the invention and 91% for the reflector and aluminum of the irradiation unit 35 according to the invention. In the case of the 180 ° measurements, the total length of the measurement without reflector was used. The reflectivities of the metallic reflectors are smaller than the theoretical values, since a considerable portion of the radiation is reflected back onto the radiator.
- the irradiation unit with a radiator and with a reflector as described in the invention are even more effective, since they not only have a much higher efficiency, such as new external reflectors, but even limit the radiation primarily on the process-relevant angle range.
- FIG. 4 shows a device according to the invention in cross section.
- a substrate 2 is conveyed forward by means of suitable devices 3 on rollers perpendicular to the image plane.
- the loading sluice, as well as other process chambers are not shown.
- the gas pressure within the chamber 1 is controlled by means of suitable pumps 4 with closed lock to the atmosphere.
- the irradiation unit with a radiator 5 with a reflector layer 6 are arranged above the substrate 2.
- cooling channels 7 are introduced, which allow to keep the chamber wall at a constant temperature.
- the interior walls of the chamber are made of bare, preferably polished metal (aluminum or stainless steel). For this purpose, the finished chamber 1 is finally processed from the inside.
- the thus equipped chamber 1 is extremely easy to manufacture and very accessible, since only vinous components are arranged in their interior. At the same time it has a very high efficiency in the heating, since almost no radiation primarily reaches and heats the chamber wall or other built-in components.
- the chamber wall retains its relatively high reflectivity (> 65%, depending on the material and the radiator), as it is cooled and can not start.
- the radiator 5 itself almost no masses are present in the chamber 1, which must be heated or cooled, the entire apparatus is thermally very nimble.
- the emitters consist almost exclusively of quartz glass, that has a mass of 2.2 g / cm 3 , or the reflector according to the invention, which has a density of approximately 1.75 g / cm 3 .
- FIG. 5 shows a device according to the invention in which the radiation cooling between the radiator 5 and the chamber 1 as well as the substrate 2 has been optimized.
- the two large surfaces 9 have been additionally coated with a transparent or translucent layer 8, which shows similar absorption properties, such as quartz glass.
- the useful radiation is reflected in the range between 400 nm and 4000 nm substantially back into the chamber 1, since the layer 8 transmits the radiation to the metallically reflecting chamber wall, at the same time, however, the radiation occurring at higher wavelengths effectively from the chamber through the layer 8 absorbed.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Chemical Vapour Deposition (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007048564A DE102007048564A1 (en) | 2007-10-09 | 2007-10-09 | Device for an irradiation unit |
PCT/EP2008/008045 WO2009049752A1 (en) | 2007-10-09 | 2008-09-23 | Apparatus for an irradiation unit |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2198668A1 true EP2198668A1 (en) | 2010-06-23 |
Family
ID=40106484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08802533A Ceased EP2198668A1 (en) | 2007-10-09 | 2008-09-23 | Apparatus for an irradiation unit |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100219355A1 (en) |
EP (1) | EP2198668A1 (en) |
CN (1) | CN101822122A (en) |
DE (1) | DE102007048564A1 (en) |
WO (1) | WO2009049752A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009037788A1 (en) * | 2009-08-18 | 2011-02-24 | Saint-Gobain Sekurit Deutschland Gmbh & Co. Kg | Infrared emitter for use in heating and thermal conversion of planar substrate, preferably glass substrate, comprise casing tube and heating source, which is installed on casing tube |
DE102010008084A1 (en) * | 2010-02-15 | 2011-08-18 | Leybold Optics GmbH, 63755 | Device for thermal treatment of substrates |
GB201513339D0 (en) * | 2015-07-29 | 2015-09-09 | Pilkington Group Ltd | Coating apparatus |
DE102017119280A1 (en) | 2017-08-23 | 2019-02-28 | Heraeus Noblelight Gmbh | Method and apparatus for producing a polyimide layer on a substrate |
CN111683689A (en) | 2017-12-11 | 2020-09-18 | 葛兰素史克知识产权开发有限公司 | Modular aseptic production system |
US11370213B2 (en) | 2020-10-23 | 2022-06-28 | Darcy Wallace | Apparatus and method for removing paint from a surface |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3248740C2 (en) * | 1982-12-31 | 1995-04-13 | Hans Fritz | Radiant heater |
US5276763A (en) * | 1990-07-09 | 1994-01-04 | Heraeus Quarzglas Gmbh | Infrared radiator with protected reflective coating and method for manufacturing same |
DE4306398A1 (en) * | 1993-03-02 | 1994-09-08 | Leybold Ag | Device for heating a substrate |
WO1998028660A1 (en) * | 1996-12-20 | 1998-07-02 | Koninklijke Philips Electronics N.V. | Furnace for rapid thermal processing |
US6173116B1 (en) * | 1997-12-19 | 2001-01-09 | U.S. Philips Corporation | Furnace for rapid thermal processing |
EP1089949B1 (en) | 1998-06-26 | 2002-09-18 | Unaxis Trading AG | Heat conditioning process |
DE19849462A1 (en) * | 1998-10-21 | 2000-07-06 | Dieter Bimberg | IR lamp heating for temp. over 1000 degrees C for rear side heating of substrate holders in installations for gas phase epitaxy |
JP3438658B2 (en) | 1999-07-22 | 2003-08-18 | ウシオ電機株式会社 | Lamp unit and light irradiation type heating device |
US7067770B1 (en) | 1999-11-09 | 2006-06-27 | Centrotherm Elektrische Anlagen Gmbh & Co. | Radiant heating system with a high infrared radiant heating capacity, for treatment chambers |
US6600138B2 (en) * | 2001-04-17 | 2003-07-29 | Mattson Technology, Inc. | Rapid thermal processing system for integrated circuits |
ATE392008T1 (en) * | 2001-05-28 | 2008-04-15 | Gunther Ackermann | DEVICE FOR HEATING SUBSTRATES WITH SIDE PANEL AND SECONDARY REFLECTORS |
US7115837B2 (en) * | 2003-07-28 | 2006-10-03 | Mattson Technology, Inc. | Selective reflectivity process chamber with customized wavelength response and method |
DE102004002357A1 (en) | 2004-01-15 | 2005-08-11 | Heraeus Noblelight Gmbh | Method for operating an infrared radiating element and use |
DE102004051846B4 (en) * | 2004-08-23 | 2009-11-05 | Heraeus Quarzglas Gmbh & Co. Kg | Component with a reflector layer and method for its production |
DE102005058819B4 (en) * | 2005-10-13 | 2009-04-30 | Heraeus Quarzglas Gmbh & Co. Kg | Process for coating a component made of glass containing siliceous silica, with a component containing SiO 2, glassy layer, and use of the component |
FR2946777B1 (en) * | 2009-06-12 | 2011-07-22 | Commissariat Energie Atomique | DEVICE FOR DETECTING AND / OR EMITTING ELECTROMAGNETIC RADIATION AND METHOD FOR MANUFACTURING SUCH A DEVICE |
-
2007
- 2007-10-09 DE DE102007048564A patent/DE102007048564A1/en not_active Ceased
-
2008
- 2008-09-23 CN CN200880110757A patent/CN101822122A/en active Pending
- 2008-09-23 WO PCT/EP2008/008045 patent/WO2009049752A1/en active Application Filing
- 2008-09-23 US US12/682,413 patent/US20100219355A1/en not_active Abandoned
- 2008-09-23 EP EP08802533A patent/EP2198668A1/en not_active Ceased
Non-Patent Citations (1)
Title |
---|
See references of WO2009049752A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN101822122A (en) | 2010-09-01 |
WO2009049752A1 (en) | 2009-04-23 |
DE102007048564A1 (en) | 2009-04-23 |
US20100219355A1 (en) | 2010-09-02 |
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