Method for manufacturing large-area vacuum plasma treated substrates and vacuum plasma treatment apparatus
View Patent ↗A large surface substrate ( 5, 5 a ) is Rf vacuum plasma treated with the help of an electrode arrangement ( 9 ) consisting of an even number of electrode strips ( 9 a , 9 b ). At least one of the strips is Rf supplied at least two distinct loci (P 1 , P 2 ) along the central axis (A) of the addressed strip ( 9 a ).
1. A method for manufacturing vacuum plasma treated substrates comprising:
exposing in a vacuum recipient a substrate surface of at least 1 m2 to be treated to a substantially plane and distant electrode pattern comprising of an even number of parallel, mutually distant electrode strips of substantially equal length,
supplying Rf plasma discharge energy to at least one of said strips at least two distinct loci along the length axis of said at least one strip,
treating said substrate by a plasma established with said electrode pattern, and
selecting said loci along said length axis to have an average of mutual distances, the outermost of said at least two loci being distant from the small edges of the strip by s/2+20%, wherein the loci along said length axis are chosen to achieve a homogeneous surface treatment on substrate.
2. The method of claim 1 , comprising at least three of said loci along said axis, the mutual distances of said points differing from average s by at most 20% of said average.
3. The method of claim 1 , said points being provided along the length axis of at least two of said strips, preferably along the length axes of at least a predominant number of said strips.
4. The method of claim 1 , comprising generating said plasma discharge energy with a maximum energy at a predetermined frequency f o , at least one of said average s and a width of said strips being selected to be at most 1/10λ o , wherein λ o is the wavelength corresponding to the frequency f o .
5. The method of claim 1 , comprising adjusting location of said loci.
6. The method of claim 1 , comprising subdividing said strips in at least two subsets of strips and supplying the strips of said subsets with electric Rf signals respectively which add substantially to a zero signal.
7. The method of claim 1 , said plasma treating being non-reactive or reactive etching or layer deposition.
8. The method of claim 7 , said layer deposition being PECVD.
9. The method of claim 1 , wherein s is an average of mutual distances of the loci where Rf plasma discharge energy is supplied along the length axis of said at least one strip.
10. The method of claim 1 , further comprising:
operating a substrate support that is attached to the substrate at a ground potential or a DC potential.
11. The method of claim 1 , further comprising:
supplying Rf plasma discharge energy to one of said mutually distant electrode strips at at least two distinct loci along the length axis of said one of said mutually distant electrode strips.
12. A method for manufacturing vacuum plasma treated substrates comprising:
exposing in a vacuum recipient a substrate surface of at least 1 m 2 to be treated to a substantially plane and distant electrode pattern comprising of N e parallel, mutually distant electrode strips of substantially equal length,
supplying Rf plasma discharge energy to at least one of said strips at at least two distinct loci along the length axis of said at least one strip,
treating said substrate by a plasma established with said electrode pattern, wherein the Rf is supplied in an odd number of phases, and wherein N e is an integer multiple of the number of phases.