210mmx210mm M12 monocrystalline silicon solar wafer with diameter of 295mm is 80.5% bigger than M2 wafer.
1 Material properties
Property | Specification | Inspection Method |
Growth method | CZ | |
Crystallinity | Monocrystalline
| Preferential Etch Techniques（ASTM F47-88） |
Conductivity type | P-type | Napson EC-80TPN P/N |
Dopant
| Boron, Gallium
| - |
Oxygen concentration[Oi] | ≦8E+17 at/cm3 | FTIR (ASTM F121-83) |
Carbon concentration[Cs] | ≦5E+16 at/cm3 | FTIR (ASTM F123-91) |
Etch pit density(dislocation density) | ≦500 cm-3 | Preferential Etch Techniques（ASTM F47-88） |
Surface orientation | <100>±3° | X-ray Diffraction Method (ASTM F26-1987) |
Orientation of pseudo square sides | <010>,<001>±3° | X-ray Diffraction Method (ASTM F26-1987) |
2 Electrical properties
Property | Specification | Inspection Method |
Resistivity | 0.5-1.5 Ωcm | Wafer inspection system |
MCLT (minority carrier lifetime) | ≧50 μs | Sinton BCT-400 (with injection level: 1E15 cm-3) |
3 Geometry
Property | Specification | Inspection Method |
Geometry | Full square | |
Wafer Side length | 182±0.25 mm | wafer inspection system |
Wafer Diameter | φ247±0.25 mm | wafer inspection system |
Angle between adjacent sides | 90° ± 0.2° | wafer inspection system |
Thickness | 180 ﹢ 20/﹣10 µm; 170﹢ 20/﹣10 µm | wafer inspection system |
TTV (Total thickness variation) | ≤ 27 µm | wafer inspection system |
4 Surface properties
Property | Specification | Inspection Method |
Cutting method | DW | -- |
Surface quality | as cut and cleaned, no visible contamination, (oil or grease, finger prints, soap stains, slurry stains, epoxy/glue stains are not allowed) | wafer inspection system |
Saw marks / steps | ≤ 15µm | wafer inspection system |
Bow | ≤ 40 µm | wafer inspection system |
Warp | ≤ 40 µm | wafer inspection system |
Chip | depth ≤0.3mm and length ≤ 0.5mm Max 2/pcs; no V-chip | Naked eyes or wafer inspection system |
Micro cracks / holes | Not allowed | wafer inspection system |
Hot Tags: p type m10 monocrystalline solar wafer, China, suppliers, manufacturers, factory, made in China
