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Posted: October 6, 2008
LayTec Develops In-Situ Sensor for Photovoltaics Market
(Nanowerk News) LayTec has announced that the German
Federal Ministry of Economics
and Technology has
approved funding for the
development of a new insitu
sensor for the photovoltaic
with the Fraunhofer
Institute for Solar Energy
Systems (ISE), Germany, a
research project has been
launched to improve the
in-situ monitoring of MOVPE
processes for triple-junction photovoltaic cells being developed
at Fraunhofer ISE.
The cooperation between LayTec
and the “III-V- Epitaxy and Solar Cells” group is aimed to develop
monitoring sensors for industrial-scale manufacturing
of triple-junction solar cells with improved process control in
multi-wafer MOVPE reactors.
“Real-time analysis and control
of our processes is becoming a key for the development of
complex semiconductor structures such as multi-junction
solar cells” says Dr. Frank Dimroth from Fraunhofer ISE, “We
are proud to collaborate with LayTec to improve the capability
of their in-situ sensor for our specific application”.
ISE’s cells are the most efficient produced in Europe today.
ISE transfers its process technology to the cooperation partner
Azur SSP, who prepares them for commercial production.
ISE and Azur SSP use AIXTRON Planetary® systems both for
development and manufacturing. LayTec’s EpiCurve®TT sensor,
which has already become the bestseller on the MOCVD
LED market, will be further improved to achieve the resolution
necessary for multi-junction solar cell growth under the conditions
of planetary rotation. In addition to temperature, layer
thickness and strain measurements, the new sensor will determine
the composition and help to better understand the
reasons for dislocations and strain within the layers. This will
help to compensate for strain induced temperature inhomogeneities,
to determine the thickness of individual thin layers
and to monitor the composition of critical heterojunctions.