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

Low Efficiency Solar Cell

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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