Evolution of different solar cells

Evolution of different solar cells_M6 cells

31 Aug 2021

The demand for wafers has exponentially increased over the past two decades due to the increase in the production and sale of PV systems. The increase in the wafer size allows the production of more semiconductor instruments from only a single wafer, which improves productivity and effectiveness of wafers. With the advancements of technology, currently M2, G1, M4, M6, M10 and M12 are different wafer sizes used in the solar cell production. With the continuation from the previous week, on this article we are going to discuss about the M6 cell.

M6 cell:

P type M6 mono-crystalline wafers with the length of 166mm and diameter of 223mm is 12.21% bigger than M2 wafer. it means that solar cells made of M6 substrate will generate 12.21% higher power output than that made of M2 substrate.

i. Material properties:

Property	Specification
Growth method	CZ
Crystalline	Mono-crystalline
Conductivity type	P-type
Dopant	Boron, Gallium
Oxygen concentration[Oi]	≦8E+17 at/cm3
Carbon concentration[Cs]	≦5E+16 at/cm3
Etch pit density(dislocation density)	≦500 cm-3
Surface orientation	<100&±3°
Orientation of pseudo square sides	<010&,<001&±3°

ii. Electrical properties:

Property	Specification
Resistivity	0.5-1.5 Ω.cm
MCLT (minority carrier lifetime)	≧50 μs

iii. Physical properties:

Property	Specification
Geometry	Full Square
Wafer Side Length	166±0.25 mm
Wafer Diameter	φ223±0.25 mm
Angle between adjacent sides	90°± 0.2°
Thickness	180 ﹢ 20/﹣10 µm; 170﹢ 20/﹣10 µm
TTV (Total thickness variation)	≤ 27 µm

iv. Surface properties:

Property	Specification
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)
Saw marks / steps	≤ 15µm
Bow	≤ 40 µm
Warp	≤ 40 µm
Chip	Depth ≤0.3mm and length ≤0.5mm. Max 2/pcs; no V-chip
Micro cracks / holes	Not allowed

With these properties, M6 cells can work very efficiently and are getting very popular due to its performance, efficiency and reliability. Even EverExceed Solar Panels have now started to manufacture with M6 cells to get much efficiency.

If you want to know more about different solar solution, contact EverExceed today. Our team is experienced for more than a decade on the industry to provide you best solution for your needs.

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