Our company are ready to buy mono crystalline silicon scrap
and also polycrystalline silicon scrap and wafer silicon scrap.
We are interested in long term cooperation and ready
to make a contract for delivery materials we need.
If you have scrap different of our specifications, we
are ready to check, is it suitable for us or not
Specification as follows:
1. Mono crystalline silicon scrap
Pieces- min weight of the piece- 50 gramm.
Contains of carbon not more than 2,5* 1016 at/sm3
Resistance not less than 1om/sm
P-type of conduction (boron as ligature material)
For production solar quality mono crystalline silicon
Scrap must no have silicon carbide, quartz, etc.
2. Polycrystalline silicon scrap
Acceptor (boron) <0,1 PPBA< 1 PPBA
Donor (phosphorus) < 0,5 PPBA < 2 PPBA
Carbon < 0,1 PPMA < 1 PPMA
Size of pieces:
< 3 mm. not more than 2%
3mm-125 mm. not less than 98%
Typical size of pieces 65-125 mm.
3. Broken wafers
1. Method of growing- Chokhralsky
2. Type of conduction-P
3. Ligature boron
4.Orientation (100)+/- 3
5.Resistance OM/SM 0,5-6,0
6. Optical active oxygen concentration not more than sm3<1* 1018
7. Optical active carbon concentration not more than sm3<1* 1017
8. Live time not less than mcs 10
Best Regards and waiting for your replay
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