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Multi-Silicon Wafers
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Mono-Silicon Wafers
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Automotive Wafers
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Wafer Slicing Service
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Ingot Growing Service
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Bricketing Service
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Squaring Service
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Mono-Silicon Wafers (monocrystalline /
Czochralski / CZ wafers)
Monocrystalline wafers are used for monocrystalline solar
cells, the second most common photovoltaic technology (about
3/7 of the silicon-wafer based world market). It is remarkable
that all the atoms throughout a mono-silicon wafer or ingot
sit in an exactly oriented lattice structure – combined
with a purity of 99,998% this makes mono-silicon a really
high-tech material. This also helps in giving the ready
cells their typical very smooth, uniform black appearance.
Silicon monocrystals for use in photovoltaics are produced
using the Czochralski
method
It produces always round ingots but for applications
more or less square cells are needed. The generally adopted
solution is the squaring of the ingots to a pseudosquare
shape (“square with cut-off / rounded corners”).
Swiss Wafers AG produces monocrystalline wafers mainly
from such pseudosquare mono-silicon ingots and can also
accomplish the squaring operation. Monocrystalline ingots
and wafers are produced in various standardized sizes.
Characteristic properties of monocrystalline technology
are
• |
wafers are usually pseudosquare so that they fit
together in the module and at the same time most of
the original round shape is used |
• |
requirements for raw material quality are higher
than for multicrystalline |
• |
monocrystalline cells have the highest light to
electricity conversion efficiency among all huge-volume
technologies. This makes monosilicon the material
of choice for high-end applications and compensates
for the rather high price. |
Monocrystalline (Czochralski method of growing) wafers:
Resistivity 0,5-3 Ohm*cm or 3-6 Ohm*cm
square size
(mm) +/-0,5 |
square size
(mm) +/-0,5 |
diagonal
(mm) +/-1,0 |
Thickness
(mkm) +/-20 |
TTV
(total thickness variations) |
156 |
156 |
200 |
200 |
30 |
125 |
125 |
150 |
200 |
30 |
125 |
125 |
165 |
200 |
30 |
100 |
100 |
136 |
200 |
30 |
100 |
100 |
136 |
230 |
30 |
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