Bifacial Solar Cells
A bifacial solar cell (BSC) is a photovoltaic solar cell that can produce electrical energy when illuminated on both its surfaces, front or rear. Instead, monofacial solar cells only produce electrical energy when photons impinge on their front side. Efficiency of bifacial solar cells, defined as the ratio of incident luminous power to generated electrical power, is measured independently for the front and rear surfaces under one or several suns (1 sun = 1000W/m2). The bifaciality factor (%) is defined as the ratio of rear efficiency in relation to the front efficiency subject to the same irradiance. The vast majority of solar cells are made today of silicon. Silicon is a semiconductor and as such, its external electrons are in an interval of energies called the valence band and they entirely fill the energy levels of this band. Above this valence band there is a forbidden band or bandgap of energies within which no electron can exist, and further above, we find the conduction band. ...
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Solar Cell
A solar cell, or photovoltaic cell, is an electronic device that converts the energy of light directly into electricity by the photovoltaic effect, which is a physical and chemical phenomenon.