Low Efficiency Solar Cell

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Photovoltaic cells are made of special materials called semiconductors such as silicon, which is currently used most commonly. Basically, when light strikes the cell, a certain portion of it is absorbed within the semiconductor material. This means that the energy of the absorbed light is transferred to the semiconductor. The energy knocks electrons loose, allowing them to flow freely.

1.Mechanical data and design


Format

156 mm × 156 mm ± 0.5 mm

Thickness

210 μm ± 40 μm

Front(-)

1.5mm bus bars (silver),blue anti-reflection coating (silicon nitride)

Back (+)

2.5 mm wide soldering pads (silver) back surface field (aluminium)


2.Temperature Coefficient of Cells


Voc. Temp .  coef.%/K

-0.351%/K

Isc . Temp .  coef.%/K

+0.035%/K

Pm. Temp.  coef.%/K

-0.47%/K

3.Electrical Characteristic


Efficiency (%)

Pmpp (W)

Umpp (V)

Impp (A)

Uoc (V)

Isc (A)

FF (%)

17.25

4.197

0.524

7.992

0.62

8.458

80.03%

17

4.137

0.524

7.876

0.619

8.353

80.01%

16.75

4.076

0.522

7.81

0.617

8.286

79.73%

16.5

4.015

0.518

7.746

0.613

8.215

79.73

16.25

3.955

0.515

7.683

0.61

8.144

79.61%

16

3.894

0.512

7.613

0.608

8.075

79.31%

15.75

3.833

0.51

7.534

0.605

8.058

78.62%

15.5

3.772

0.508

7.453

0.604

8.02

77.87%

15.25

3.771

0.505

7.35

0.604

9.997

76.83%

15

3.65

0.503

7.271

0.604

7.989

75.64%

14.5

3.529

0.499

7.067

0.604

7.988

73.14%

14

3.407

0.499

6.833

0.604

7.833

72.01%

PV cells also all have one or more electric field that acts to force electrons freed by light absorption to flow in a certain direction. This flow of electrons is a current, and by placing metal contacts on the top and bottom of the PV cell, we can draw that current off for external use, say, to power a calculator. This current, together with the cell's voltage (which is a result of its built-in electric field or fields), defines the power (or wattage) that the solar cell can produce.


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