Several research institutes are now also
actively working on modern cell concepts such as PERL (Passivated
Emitter and Rear Locally diffusion) or IBC (Interdigitated Back Contact)
which can be produced more cost-effectively with the help of APCVD
coatings, SCHMID Group (Freudenstadt, Germany) announces.
“Our APCVD systems are very sophisticated
and have proven their value in the mass production of IBC solar cells.
Therefore, researchers will certainly find other ways to achieve high
efficiency breakthrough cell concepts with this technology,” says
Dr. Christian Buchner, Vice President of the SCHMID Group.
And this is precisely what research institutes are
working on. The globally active SCHMID Group's APCVD system can apply
boron and phosphorus diffusion sources in varying thicknesses and
concentrations to provide flexibility in the design of modern emitters
on all base materials. Moreover, it is possible to harmonize the dopant
sources for a codiffusion with one another in a way that one
high-temperature step is sufficient, the company emphasizes.
Contrary to other methods, the coating with APCVD
(Atmospheric Pressure Chemical Vapor Deposition) is cost-effective and
yet flexible, since multiple injection heads in series enable the
application of the source layer and the cap layer in a single pass.
The principle: gases stream out of separate
channels, and when they come into contact with preheated wafers, they
deposit a homogeneous glass layer. The wafers to be coated pass through
the APCVD system in five parallel tracks. Thus, a throughput of up to
4,000 wafers per hour is achieved.
source: http://www.solarserver.com
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