• date_rangePosted On :   Jul 03' 2007
  • location_cityCity :   Pattaya
  • languageCountry :   Thailand
  • content_pasteEnquiry No. :   7070374

Dear Sir
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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