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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 length*side length * diameter

M0:   156*156*ϕ210   mm

M1:   156.75*156.75*   ϕ205mm

M2: 156.75*156.75* 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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