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Cu
0.155
>9N
Zn
2.034
>8N
Mo
0.053
>10N
Mn
0.047
>10N
Co
0.027
>10N
Zr
0.002
>11N
Nb
0.003
>11N
Ta
0.072
>10N
W
0.003
>10N
V
0.002
>11N
sum
8.3
SEMI PV17 Class I
The data presented in table 1 are close to the detection limit of the lab and confirm that
the material in regards of transition metals fulfills the SEMI PV17 criteria for class one
solar grade silicon.
This is also in good accordance with the cell efficiencies obtained at various customers
which are presented in Figure 5.
Figure 5:
Cell efficiencies obtained with solar-silicon purified by Silicor’s technology.
Data points represent average efficiency of single solar ingots. A maximum Eta of 18.9%
has been reached on PERC cells with 100% Silicor solar Si and standard BSF-cells after
HP-mc-crystallization reach the baseline of the customer. This suggests that the silicon
purified using Silicor’s process is not a limiting factor for solar cell efficiency.
13