VENDORVIEW
specially designed, shake-proof laser optics are
moved on high-speed and high-precision
motorized axes. For on-the-fly applications the
beam positioning is carried out by fast and precise
scanner deflection head technology. For ultimate
precision ROFIN mounts all crucial components on
a rigid granite platform. Vision control systems
allow for precise synchronization with fiducials and
automated quality inspection.
Issue V 2009
Thin-Film Processing with Solid State
Rod Lasers
Exceptional beam quality is crucial for laser
scribing processes on thin-film cells in order to
maintain small scribe widths and constant depths.
A large depth of focus, the result of high beam
quality, enables the user to work through various
-pv-management.com material irregularities such as imperfect flatness
25-100 holes with solutions to achieve complete compensation of and thickness of large glass panels. Pulse-to-pulse
.solar
a diameter of 200-500 web movement during the laser beam positioning. stability is key in maintaining elevated repetition
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µm are drilled in a Second, as flexible substrates like polymer foils are rates during the high processing speeds. Lasers
grid pattern on one prone to distortion the winding system has to with best beam quality (TEM00) with very high
18
solar cell provide precise web guiding and to monitor web repetition rates of up to 4200 kHz are used for
(picture by courtesy tension carefully. And last but not least perfect ablating 20 to 50 micron wide paths with scribing
of ILT Aachen) synchronization between the laser process and the speeds of up to 25,000 mm/s without damaging
winder, including the handling of start-up and the substrate or the layers underneath. This is the
shutdown phases, is an absolute must. Compared reason why Nd:Vanadat lasers with short ns-pulse
to other web production lines, web speeds in thin- widths (max. 100 7- 70 ns) are the standard laser
film production are comparatively low, but type for this kind of application. The ideal
demands on positioning accuracy and long time wavelength for the various processes depends on
precision are significantly higher. A fact which the composition of the individual layers.
brings step & repeat processing into play. Fundamental (1064 nm) and wavelengths with
double frequency (532 nm) are commonly used in
ROFIN‘s new solutions for flexible solar cell the production of a-Si, CIS and CdS/CdTe solar
production handle step & repeat as well as on-the- cells.
fly processes. They can be equipped with multiple
Roll-to-roll processing laser sources to conduct several laser processing The particularities of solar cell manufacturing ask
offers substantial steps on a-Si, µc-Si, CIGS and organic cells within for laser beam sources which are consistently
potential for reducing one system. Typical applications are laser ablation, optimized for this application purpose, like
production costs while laser isolation of modules, monolithic integration ROFIN‘s PowerLine PV series. SL. This laser series
increasing flexibility in and laser marking. For step & repeat applications was specifically designed for scribing of
thin-film cell photovoltaic and other electric thin-films. The
manufacturing applications include TCO/ITO/AZO layers
on glass or flexible substrates, active
layers on thin-film modules like a-Si/µ-Si,
CdTe and CI(G)S, and the back contact
layers like Al, Ag, Mo and combinations of
such. The new member of the product
family is the compact Powerline SL PV (1064 and
532nm) tailored for machine integration with one
laser per scribe head. The well proven PowerLine
E series with higher output powers is tailored for
beam splitting application supporting 2 or 4 scribe
heads per laser. The refined temperature
management system maintains lasting long- term
stability and performance.
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