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Großröhrsdorf, Germany

Southwall Europe Gmbh | Date: 2012-03-14

A process is described for modification of a surface of a substrate by ion bombardment, in which the ions are produced by means of a magnetic field-assisted glow discharge in a process gas. The magnetic field-assisted glow discharge is produced by means of a magnetron having an electrode and at least one magnet for production of the magnetic field. The process gas has at least one electronegative constituent, such that negative ions are produced in the magnetic field-assisted glow discharge, and the negative ions which are produced at the surface of the electrode are accelerated in the direction of the substrate by an electrical voltage applied to the electrode.

The invention relates to multilayer systems for selective reflection of electromagnetic radiation from the wavelength spectrum of sunlight, and to a method for producing said systems on suitable, preferably polymeric, carrier materials. Such a multilayer system of the invention is formed with at least one layer composed of silver or silver alloy, which is coated over the whole area on both surfaces with in each case a seed layer and a cap layer. In this case, the seed layer and cap layer are formed from dielectric material. These are ZnO and/or ZnO:X. In this case, at least one such multilayer system is formed on a flexible polymeric substrate, preferable a film which is optically transparent in the visible spectral range.

Schonberger W.,TU Dresden | Gerlach G.,TU Dresden | Fahland M.,Fraunhofer Institute for Electron Beam and Plasma Technology | Munzert P.,Fraunhofer Institute for Applied Optics and Precision Engineering | And 3 more authors.
Surface and Coatings Technology | Year: 2011

Self-organized nano-structures can be created on polymer surfaces by applying a plasma or ion treatment [1]. This technology may be used for anti-reflection (AR) applications in plastic optical devices, e.g. for aspheric lenses in mobile phone cameras. Compared to conventional AR-coatings, the nano-structures exhibit a large potential for reduction of cost and increase of optical performance. The technology described in [1] was developed in a batch-coater and successful used to achieve AR-properties to polymer sheets and optical devices.This paper describes the transfer of this technology from a batch coater to an in-line machine for continuous surface treatment. A suited ion source to being installed in reel-to-reel equipment is chosen. The best properties for the described approach were observed by polymer surface treatment by a glow discharge created with a dual magnetron system with fully poisoned (oxidized) target surface. The process was installed and optimized in a pilot-scale reel-to-reel coating machine with a process width of 600. mm. Stochastic nano-structures were created on PET, TAC and ETFE substrates. The relevant process parameters for plasma treatment are discussed. The process was transferred to industrial equipment with 2100. mm process width. © 2011 Elsevier B.V. Source

Kleinhempel R.,Southwall Europe GmbH | Wahl A.,Southwall Europe GmbH | Thielsch R.,Southwall Europe GmbH
Surface and Coatings Technology | Year: 2011

Organic substrates achieve an increasing interest for various applications due to cost reduction in small and large area displays, polymer optics, photovoltaic front cover or in fields of energy reduction.With the need to develop and to provide anti-reflecting (AR) properties to various plastic surfaces in large volume applications such as flat panel displays, automotive displays, portable communication systems or complex optical devices different methods have been developed. Those methods are ranging from classical additive interference coating to optical inhomogeneous effective medium like surface structures.The paper compares additive, subtractive and surface morphology changing technologies which are well suited to large area wide web roll to roll (R2R) processing such as standard technique like magnetron sputtering (single layer low index films, classical HL multilayer interference coatings), chemical wet coating, PE-CVD, and several technologies which modify the surface structure of the plastic material by thermo-mechanical methods (embossing) or plasma induced surface modifications to get AR properties.MF magnetron sputter technology is state of the art in large area architectural glass coating, but also applied for wide web R2R deposition of plastic materials such as PET, PEN, TAC or Fluor-Polymers which are the base materials for flat panel displays and flexible photovoltaic.In the given paper special emphasis is laid on the comparison of R2R sputter deposition of single and multilayer coatings and plasma induced surface modification of polyester films. Special attention is paid on the scalability of magnetron based technologies to industrial size. © 2010. Source

The influence of roughness of plastic substrate was investigated regarding low e functional film properties. Using a rough surface results in increased absorption in the visible spectral range. This absorption is mainly caused by surface plasmon excitation. In order to achieve high transmittance (T vis) - which is required for the application in insulating glass units - it is required to use smooth substrate surfaces. An appropriate pre conditioning of the substrate can provide improved surface conditions. The strength and spectral position of the plasmon resonance is also determined by the dielectric material surrounding the silver. A high refractive index material is required to anti-reflect the silver properly. But on rough surfaces this may result in increased absorption. One possibility to overcome the strong absorption is applying an intermediate layer with lower index next to the silver. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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