WO2004098259A2 - Plasmabehandlung zur reinigung von kupfer oder nickel - Google Patents
Plasmabehandlung zur reinigung von kupfer oder nickel Download PDFInfo
- Publication number
- WO2004098259A2 WO2004098259A2 PCT/EP2004/004904 EP2004004904W WO2004098259A2 WO 2004098259 A2 WO2004098259 A2 WO 2004098259A2 EP 2004004904 W EP2004004904 W EP 2004004904W WO 2004098259 A2 WO2004098259 A2 WO 2004098259A2
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- WO
- WIPO (PCT)
- Prior art keywords
- radicals
- plasma
- components
- chamber
- hydrogen
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/26—Cleaning or polishing of the conductive pattern
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
Definitions
- the present invention relates to a method for the treatment, in particular for cleaning, of electronic components which are made of or are coated with copper or nickel or their alloys such as brass, using reactive plasmas.
- Components made of or coated with copper or nickel or their alloys such as brass are typically covered with a layer of contaminants. There is always at least one native layer of oxide on the surface. The components are also more often contaminated with various organic and inorganic contaminants. Organic contaminants are often residues of oil or fat that was applied during processing. Inorganic contaminants include oxides as well as chlorides and sulfides. The thickness of inorganic contaminants on surfaces depends on the environment in which the components were stored as well as on the temperature. The higher the temperature, the thicker the layer of inorganic contaminants.
- the layer of impurities on components should be removed before further processing, in particular printing, painting, gluing, soldering or welding, in order to ensure good processing quality.
- this element is currently considered an interconnect material because copper has a low resistivity and a relatively high current carrying capacity.
- copper is very susceptible to oxidation. With copper deposits, oxidation is considered a disadvantage, and it interferes with the adhesion to the adjacent layer, affects the conductivity of the copper structural element and reduces the reliability of the entire circuit. Therefore, an extremely effective method for cleaning copper deposits in devices with integrated circuits.
- Novel cleaning methods have been used in one or more steps in the manufacture of devices with integrated circuits.
- the novel processes are based on the use of an unbalanced state of gases - frequently a low-pressure plasma, as is the case, for example, in the article "Plasma process in electronics production” by J. Messel Reifen, mo, Year 55 (2001) 8, pp. 33 to 36, or an afterglow rich in reactive particles. They have been used to remove both organic and inorganic contaminants that appear on surfaces during manufacturing phases, as well as to clean the manufacturing chamber.
- a method for cleaning the surfaces of workpieces is also described in German Offenlegungsschrift DE 19702124 AI. Accordingly, different gases, alone or as two or more component gas mixtures, can be used to generate a plasma.
- DE 4034842 C2 describes a plasma chemical cleaning process with oxygen and hydrogen as successive working gases and a subsequent PVD or PECVD coating of metal substrates.
- the plasma is excited with frequencies in the microwave range, with the aim of achieving a high proportion of radicals and ions.
- Another possibility of pretreating a surface is described in Japanese patent application JP 62158859 A, in which the surface is bombarded first with ions of a noble gas and then with hydrogen ions.
- Copper cleaning processes involving plasma cleaning have been described and patented in various contexts, such as a machining process that integrated with devices during the manufacture Circuits are used as a method for pre-cleaning (US 6,107,192, TW 411497, FR 2801905), for removing the oxide layer on side walls, connections and passages (TW 471126, US 2001-049,181, US 6,323,121, US 6,309,957, US 6,204,192, EP-1 041 614, WO 00/29642) or on copper connection points (WO 02/073687, US 2002-127,825), or for improving the copper process integration (US 6,395,642), or for cleaning devices with integrated semiconductor circuits which have buried interconnections which contain copper in the Have main conductor layers (US 2002-042,193).
- pre-cleaning US 6,107,192, TW 411497, FR 2801905
- the recommended gas for copper cleaning is a mixture of hydrogen and nitrogen, or ammonia.
- a mixture of argon and hydrogen is recommended in patent specification TW 471126. This mixture is also suitable for removing fluorine-containing etching residues (TW 472319).
- Plasma cleaning has also been patented as a method for removing deposited etching by-products from surfaces of a semiconductor processing chamber after a copper etching process (US 6,352,081, TW 466629, WO 01/04936). This process involves the application of an oxidizing plasma and a plasma containing a reactive type of fluorine.
- the present invention has for its object to provide a method for the treatment of electronic components, which are made of copper or nickel or their alloys with each other or with other materials such as brass, or are coated, by means of which the surface of the relevant components cleaned and prepared in a special way for subsequent low-temperature processing with the highest quality. This task is solved by the method specified in claim 1.
- the components are successively exposed to an oxygen plasma and a hydrogen plasma in order to first remove organic and then oxidative contaminants, with specific conditions with regard to the pressure in the treatment chamber (10 _1 to 50 mbar), the type of.
- Excitation of the plasma in the chamber by a high-frequency generator with a frequency of more than about 1 MHz
- the intensity of the action of oxygen radicals on the components are observed.
- This favors further processing, in particular by improving the subsequent adhesion of adhesive or solder to the surface and reducing the resistance of connection points.
- This method is an environmentally friendly alternative to industrial cleaning processes that currently use wet dry cleaning.
- the present invention provides a method for removing organic and inorganic contaminants from surfaces of electronic components made of or coated with copper or nickel or their alloys such as brass.
- the components are placed in a vacuum chamber, which is preferably evacuated to a pressure of 10 Pa or less.
- the chamber is then filled with an oxidizing gas.
- the oxidizing gas is pure oxygen or a mixture of argon or another noble gas with oxygen and the total pressure is 10 to 5000 Pa.
- the introduction of water vapor or a mixture of argon or another noble gas with water vapor can also be provided.
- Argon can be caused by anything Noble gas to be replaced.
- a plasma is excited by a high-frequency discharge. Oxygen radicals generated in the discharge interact with the organic surface contaminants and oxidize them to water and carbon oxide, which are desorbed and pumped out of the surface. After the oxidizing plasma treatment, the surface is free of organic contaminants.
- Inorganic contaminants mainly copper or nickel oxides
- Argon can be replaced by any noble gas.
- a plasma is excited by a high-frequency discharge. Hydrogen radicals generated in the discharge interact with the inorganic surface contaminants and reduce them to water and other simple molecules such as HC1, H 2 S, HF etc., which are desorbed and pumped out of the surface. After the hydrogen plasma treatment, the surface is effectively free of any contaminants.
- a particular aspect of the present invention is to be seen in the fact that, due to the specific conditions during the treatment, there is little or no bombardment of the surface with high-energy ions, which has proven to be particularly advantageous.
- the invention takes into account the recognition that the plasma processing increases the adhesion of the adjacent layer by reducing the content of impurities on the surface of the components and reduces the electrical resistance due to the connecting surface.
- the surface treated according to the invention is passivated, which leads to a longer resistance to air or water corrosion.
- such a surface enables very good adhesion of any material deposited on the surface, including adhesive, paint and solder.
- Figure 1 is a system schematic showing an example of a system intended for plasma cleaning of copper or nickel.
- Figure 2a is an AES (Auger Electron Spectroscopy) depth profile graph showing a concentration of chemical elements on the untreated copper sample surface as a function of sputtering time.
- AES Alger Electron Spectroscopy
- Figure 2b is an AES depth profile graph depicting a concentration of chemical elements on the wet chemically treated copper sample surface as a function of sputtering time.
- Figure 2c is an AES depth profile graph depicting a concentration of chemical elements on the oxygen plasma treated copper sample surface as a function of sputtering time.
- Figure 2d is an AES depth profile graph depicting a concentration of chemical elements on the oxygen and hydrogen plasma treated copper sample surface as a function of sputtering time.
- FIG. 1 An example of a system structure for the plasma treatment of copper or nickel is shown in the schematic illustration in FIG. 1.
- the system consists of a discharge chamber 7, a vacuum pump 1 with a valve 2, a collecting vessel with sieves 3, three different outflow valves 8 and three gas bottles 9 - oxygen, hydrogen and another gas (in particular noble gas), and results in an effective and economical treatment ,
- the plasma parameters during the etching process such as the dose of the radicals in the discharge chamber, are controlled by a vacuum meter 4 and two or more probes such as catalytic probes 5 and Langmuir probes 6.
- the flow of the radicals is adjusted to more than about 10 21 , preferably more than 10 22 or, more preferably, more than 10 24 radicals per square meter per second.
- the rate at which the radicals are formed in the gaseous plasma which contains an oxidizing gas (preferably oxygen or water vapor), depends on the power of the discharge source.
- the power is preferably between 30 and 1000 W per liter of the discharge volume in order to ensure the formation of a more homogeneous plasma in a pressure range between 10 and 5000 Pa.
- the gas may be a mixture of argon and oxidizing gas with a ratio between the gases that allows the highest concentration of oxygen radicals in the plasma.
- the plasma is generated by a high-frequency generator, which is preferably inductive is coupled.
- the frequency is more than about 1 MHz, preferably more than 3 MHz, so that heating of ions is prevented. Since the frequency is generated with a high frequency generator, it is not in the microwave range.
- the removal rate at room temperature is between 10 and 100 nm / minute. Since a typical thickness of organic contaminants on components is of the order of 10 nm, the cleaning time in a gaseous plasma which contains an oxidizing gas is approximately one minute.
- the flow rate of the gas through the vacuum system is preferably in a range from about 100 to 10,000 sccm per m 2 of treated surface, but is particularly preferably, converted to standard conditions, more than 1 liter per minute (1000 sccm) per m 2 of treated surface, so rapid removal of the reaction products is ensured.
- an oxide layer is formed on the surface of components (FIG. 2c).
- Thin films of oxides on surfaces of copper or Nikkei or their alloys are best reduced to pure metals by introducing a gaseous plasma consisting of pure hydrogen or a mixture of hydrogen and a rare gas, preferably argon.
- a gaseous plasma consisting of pure hydrogen or a mixture of hydrogen and a rare gas, preferably argon.
- the rate at which hydrogen radicals in gaseous form Plasma containing hydrogen depends on the power of the discharge source.
- the power is preferably between 30 and 1000 W per liter of the discharge volume in order to ensure the formation of a more homogeneous plasma in a pressure range between 10 and 5000 Pa.
- the gas may be a mixture of argon and hydrogen with a ratio between the gases that allows the highest concentration of hydrogen radicals in the plasma.
- the hydrogen-containing plasma is preferably generated by the same generator and in the same vacuum system as the plasma containing oxygen radicals.
- the hydrogen radicals can also be generated by a direct current glow discharge.
- the samples can be negatively biased against the wall of the discharge chamber by an additional DC voltage. It is believed that the reduction of oxidizing contaminants by hydrogen radicals is caused by a pure potential interaction of the radicals with the surface contaminants.
- the rate of reduction at room temperature is between 1 and 10 nm / minute. Since a typical thickness of oxide layers on components is of the order of 10 nm, the cleaning time in a gaseous plasma which contains an oxidizing gas is a few minutes.
- the flow rate of the gas through the vacuum system is preferably in a range from about 100 to 10,000 sccm per m 2 of treated surface, but is particularly preferably, converted to standard conditions, more than 1 liter per minute per m 2 of treated surface, so that the rapid removal of the Reaction products is ensured.
- the oxide layer is completely reduced during the hydrogen plasma treatment. Many other oxidizing contaminants including chlorides and sulfides are also reduced.
- the hydrogen plasma treatment therefore ensures a virtually atomically clean surface (FIG. 2d).
- the cleaning process therefore includes treatment with oxygen radicals followed by treatment with hydrogen radicals. If the amount of organic impurities is small, treatment with only hydrogen radicals can be used. It is believed that hydrogen radicals also react with organic contaminants, but the reaction rate is slower than that of oxygen radicals.
- FIG. 2a An example of an untreated copper surface is shown in FIG. 2a.
- the surface is contaminated with various contaminants that were left on the surface during the mechanical treatment.
- the type and concentration of the contaminants in the thin sample surface layer was determined by Auger electron spectroscopy (AES) depth profiling in a PHI545 scanning Auger microsensor with a base pressure in the vacuum chamber of less than 1.3 x 10 ⁇ 7 Pa.
- a static primary electron beam with an energy of 3 keV, a current of 3.5 ⁇ A and a beam diameter of approximately 40 ⁇ m was used.
- the angle of incidence of the electron beam with respect to the normal to the surface plane was 47 degrees.
- the samples were sputtered using two symmetrically inclined Ar + ion beams with the kinetic energy of 1 keV, which ensured etching of the sample.
- the sputtering time corresponds to the depth, ie, one minute corresponds to 4 nm.
- the depth profile of the sample after wet chemical cleaning is shown in Figure 2b.
- the samples were cleaned with tetrachlorethylene and then rinsed carefully with distilled water. It is noticeable that the thickness of a carbon film has been reduced, but still is some carbon persists in the upper thin surface layer. The thickness of the contaminant film was reduced by more than a factor of three on average from unpurified samples.
- the AES depth profile of a sample that was exposed to an oxygen plasma with approximately 7 ⁇ 10 24 radicals per square meter is shown in FIG. 2c.
- the sample With the exception of the outermost surface and presumably due to secondary contamination, the sample is almost free of a carbon film (organic contamination).
- An oxide film is formed on the surface. Reactive particles of the oxygen plasma apparently reacted with the layer of organic contaminants and removed them completely. However, an undesirable oxide layer was formed during a rather brief exposure to the oxygen plasma.
- the sample which was first exposed to the oxygen plasma, was then exposed to a hydrogen plasma with approximately 2 x 10 25 radicals per square meter.
- the AES depth profile after treatment is shown in Figure 2d. With the exception of an extremely low concentration of oxygen, carbon and sulfur and presumably due to secondary contamination after exposure to air before the AES analysis, there is almost no contamination on the surface.
- the electrical resistance measurements were made on series of ten samples, and the average resistance of the copper parts cleaned by various methods was measured.
- the resistance of the copper device samples cleaned with the wet chemical process decreased by about 16%.
- the resistance of the copper samples, which were cleaned with a combination of oxygen and hydrogen plasma was even better, since the resistance decreased by about 28%.
- the most effective method of cleaning a copper surface is a combined vacuum Erstoff-hydrogen plasma treatment, which leads to a de facto contamination-free surface without a surface contamination film and leads to a twice as good improvement in electrical conductivity. This is confirmed by AES depth profiling ( Figure 2a, Figure 2b, Figure 2c, Figure 2d) and measurements of the electrical resistance.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- ing And Chemical Polishing (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Drying Of Semiconductors (AREA)
- Cleaning In General (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04739149A EP1620581B1 (de) | 2003-05-08 | 2004-05-07 | Plasmabehandlung zur reinigung von kupfer oder nickel |
JP2006505401A JP2006525426A (ja) | 2003-05-08 | 2004-05-07 | 銅またはニッケルを洗浄するためのプラズマ処理 |
MXPA05011822A MXPA05011822A (es) | 2003-05-08 | 2004-05-07 | Tratamiento con plasma para limpieza de cobre o niquel. |
DE502004003406T DE502004003406D1 (de) | 2003-05-08 | 2004-05-07 | Plasmabehandlung zur reinigung von kupfer oder nickel |
US11/270,256 US20060054184A1 (en) | 2003-05-08 | 2005-11-08 | Plasma treatment for purifying copper or nickel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10320472.5 | 2003-05-08 | ||
DE10320472A DE10320472A1 (de) | 2003-05-08 | 2003-05-08 | Plasmabehandlung zur Reinigung von Kupfer oder Nickel |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/270,256 Continuation US20060054184A1 (en) | 2003-05-08 | 2005-11-08 | Plasma treatment for purifying copper or nickel |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004098259A2 true WO2004098259A2 (de) | 2004-11-18 |
WO2004098259A3 WO2004098259A3 (de) | 2005-02-24 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/004904 WO2004098259A2 (de) | 2003-05-08 | 2004-05-07 | Plasmabehandlung zur reinigung von kupfer oder nickel |
Country Status (9)
Country | Link |
---|---|
US (1) | US20060054184A1 (de) |
EP (1) | EP1620581B1 (de) |
JP (1) | JP2006525426A (de) |
KR (1) | KR20050121273A (de) |
CN (1) | CN100393914C (de) |
AT (1) | ATE358735T1 (de) |
DE (2) | DE10320472A1 (de) |
MX (1) | MXPA05011822A (de) |
WO (1) | WO2004098259A2 (de) |
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DE102004058452A1 (de) * | 2004-12-03 | 2006-06-08 | Vacuumschmelze Gmbh & Co. Kg | Stromerfassungseinrichtung und Verfahren zum Herstellen einer solchen Stromerfassungseinrichtung |
WO2012099548A1 (en) | 2011-01-20 | 2012-07-26 | Institut ''jožef Stefan'' | Device for high-frequency gas plasma excitation |
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Also Published As
Publication number | Publication date |
---|---|
EP1620581B1 (de) | 2007-04-04 |
ATE358735T1 (de) | 2007-04-15 |
EP1620581A2 (de) | 2006-02-01 |
DE10320472A1 (de) | 2004-12-02 |
JP2006525426A (ja) | 2006-11-09 |
DE502004003406D1 (de) | 2007-05-16 |
MXPA05011822A (es) | 2006-02-17 |
WO2004098259A3 (de) | 2005-02-24 |
KR20050121273A (ko) | 2005-12-26 |
US20060054184A1 (en) | 2006-03-16 |
CN100393914C (zh) | 2008-06-11 |
CN1777702A (zh) | 2006-05-24 |
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