Evolution of different solar cells

Evolution of different solar cells_M2 cells

31 Aug 2021

The first modules had a power class of 48 watts in 1983. Here 36 cells with the dimensions 100 x 100 mm were used. The first modules had a power class of 48 watts in 1983. Here 36 cells with the dimensions 100 x 100 mm were used. This cell size was available on the market until about 1996. The first IBC Megaline modules with 120 watt, manufactured in the USA, were based on the dimensions 125 x 125 mm and were considered the standard size for many years. Also for manufacturers from South Korea and Japan. Thus the first 156 watt module, was manufactured based on this 125 x 125 mm dimension.

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. Today we are going to discuss about the M2 cell.

M2 cells:

The fact that cell technologies featuring the highest efficiencies in industrial production are based on N type Cz-Si wafer is a striking demonstration of why n-type wafers are the most suitable material for high-efficiency solar cells.

i. Material properties:

Property	Specification
Growth method	CZ
Crystallinity	Monocrystalline
Conductivity type	N-type
Dopant	Phosphorus
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

0.2-2.0 Ω.cm

0.5-3.5 Ω.cm

1.0-7.0 Ω.cm

1.5-12 Ω.cm

Other resistivity

MCLT (minority carrier lifetime)

≧1000 μs(Resistivity & 1 Ωcm)
≧500 μs(Resistivity < 1 Ωcm)

iii. Physical properties

Property	Specification
Geometry	Pseudo square
Bevel edge shape	Round
Wafer size (Side lengthside length diameter	M0: 156156ϕ210 mm M1: 156.75156.75 ϕ205mm M2: 156.75156.75 ϕ210 mm
Angle between adjacent sides	90±3°

With these properties, M2 cells can work very efficiently and very popular due to its performance, efficiency and reliability.

Though EverExceed Solar Panels are manufactured automated line process and passed several QC tests with these M2 cells, so it requires lesser amount of maintenance, cleaning and performs efficiently with much reliability.

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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