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Process and material research for ultra-stable antireflective coatings on glass

Objective

Broad band anti-reflective coatings need a low-index material at the top position. Normally SiO2 is used. This layer is in direct contact to the environment. While a number of high- and medium-index layers with a high hardness (up to 30 GPa) have been developed in the past, the hardness of the low-index layer on the top is limited to about 10 GPa. Under hard conditions this layer is then the weak point of the total layer stack. This excludes a number of possible applications.

The goal of the project is to develope a new, ultra-stable AR-coating and the relevant deposition processes. Therefore a new optical material based on a Al-Six-Oy-Fz composite will be developed. The hardness of this material should exceed 20 GPa and must have a refractive index of lower than 1.60 (at 550 nm). The deposition process shall be based on magnetron sputtering with a special focus on highly ionized sputtering. This ensures that the process can be upscaled and can be used for high deposition rates.

The result is a broad band antireflective coating which shows a significant higher scratch resistance (from about 10 to 1000 cycles Taber-abraser test) and a doubled hardness (> 20 GPa). In addition, the coating must be stable against hydrothermal corrosion (1000 cycles autoklave).

The project focusses not only on precision optical products but potentially on all flat glas products such as glasses for instruments, photovoltaic modules, automotive, sensors, displays.

Field of science

  • /engineering and technology/materials engineering/coating and films

Call for proposal

FP7-SME-2011
See other projects for this call

Funding Scheme

BSG-SME - Research for SMEs

Coordinator

FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Address
Hansastrasse 27C
80686 Munchen
Germany
Activity type
Research Organisations
EU contribution
€ 32 488
Administrative Contact
Walter Krause (Mr.)

Participants (4)

LINKOPINGS UNIVERSITET
Sweden
EU contribution
€ 12 000
Address
Campus Valla
581 83 Linkoping
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Ulf Helmersson (Prof.)
ROLF SCHAEFER BESCHICHTUNGKOMPONENTEN
Germany
EU contribution
€ 267 398
Address
Ackerwiese 14
67728 Muenchweiler
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Administrative Contact
Rolf Schäfer (Mr.)
IONAUTICS AB
Sweden
EU contribution
€ 232 898
Address
Uvebergsvagen 45
589 31 Linkoping
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Administrative Contact
Daniel Lundin (Dr.)
W. BLOSCH AG
Switzerland
EU contribution
€ 209 816
Address
Moosstrasse 68-78
2540 Grenchen
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Administrative Contact
Peter Weiss (Mr.)