Evolution of different solar cells

Evolution of different solar cells_G1 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 G1 cell.

G1 cell:

Some of the manufacturers have already started the production of 158.75mm x 158.75mm solar cells. One of the reason for the 158.75mm square wafer getting more focus is that the close module dimensions to past standard 60-cell and 72-cell modules, providing retrofit and retention of existing manufacturing equipment.

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	158.75±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, G1 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 G1 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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