Laser Scribing of Stainless Steel with and without Work Media

By: Anna Unt, Heidi Piili, Marika Hirvimäki, Matti Manninen, Antti Salminen

Lappeenranta University of Technology, Laser Processing Technology Research Group, Finland
Machine Technology Centre Turku Ltd, Finland

Improving control and decreasing energy needs have been the most addressed problems of chemical industry in recent years. One of the thoroughly researched options has been bringing down the scale of production units. Productivity comparable with large-scale industrial mechanisms can be reached by grouping simultaneously working milli-scale production units with volumes of few ml/min having reaction channels with length of 1-100 mm, width of 0.5-2 mm and depth of 0.25-2 mm. The use of milliscale devices has been limited due to the lack of cost-efficient production method, manufacturing such channels by laser can give savings on cost and simplify the production cycle.

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Scribing of Thin Films with Picosecond Laser Pulses for CIGS Solar Cells

By: P.Gečys, G. Račiukaitis, M.Gedvilas, A. Braun, S. Ragnow

Laboratory for Applied Research, Center for Physical Science and Technology, Lithuania
Solarion AG, Germany

Low material consumption, the possibility of deposition on large areas, use of cheap and flexible substrates make the thin-film photovoltaic elements the most promising technology to achieve a significant cost reduction in solar electricity. Interest in complex multilayered CuInxGa(1-x)Se2 solar cells has increased recently because of low production costs and scalability through a roll-to-roll process. CIGS has been established as the most efficient thin-film technology in converting sunlight into electricity with the theoretical limit as high as 27% and a record value of 20.2% achieved in laboratory. Flexible CIGS solar cells have several advantages compared to those fabricated on glass substrates. Their power to weight ratio as well as excellent resistance to radiation make them ideal candidates for space use and building-integrated applications beyond the capability of rigid, heavier PV products.

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