Umicore
has a long tradition in supplying germanium wafers to the space
solar cell market. The main product for this application up to today is a
substrate with a diameter of 100 mm and a thickness in the range of 140 – 180
¼m. With the new emerging market of high-efficiency concentrator photovoltaics
(CPV) the need has arisen to investigate the use of germanium wafers with
a larger diameter. Especially for small size CPV cells, increasing the wafer diameter
will significantly reduce the processing cost per die, which will also
contribute to lowering the overall cost/kWh of CPV technology. In this paper
the development of dislocation free 150 mm germanium wafers for
CPV applications is presented. Different wafer thicknesses down to
200 ¼m have been realized. The process steps starting from crystal pulling up
to final epi-cleaning and drying will be addressed. First measurement results
on wafer level are shown as well. Finally, the future challenges in
optimizing the 150 mm waferspecifications will be reviewed.
Source:IEEE
If
you need more information about Large diameter germanium wafers for CPV
applications, please visit our website:http://www.germaniumwafers.com, send us
email at powerwaymaterial@gmail.com.
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