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A photovoltaic system by Wendy zong
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A photovoltaic system |
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Business,Business Opportunities,Science & Technology
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A photovoltaic system includes a photovoltaic device that includes lower photovoltaic cells fabricated from semiconductor material having a first bandgap, and having first electrical contacts for extraction of current from the lower cell; an electrically insulating layer monolithically fabricated on the lower photovoltaic cell; and an upper photovoltaic cell monolithically fabricated on the electrically insulating layer from semiconductor material having a second bandgap larger than the first bandgap, and having second electrical contacts for extraction of current from the upper cell.
The photovoltaic system also includes one or more first photon sources operable to supply photons to the photovoltaic device, the photons having wavelengths in a first wavelength range associated primarily with the first bandgap. The photovoltaic system further includes one or more second photon sources operable to supply photons to the photovoltaic device, the photons having wavelengths in a second wavelength range primarily associated with the second bandgap.
A photovoltaic cell converts light into electricity. To perform this function, cells use special substances that are treated to be especially effective in transferring light energy to electrical current. The substances are particularly stable, which allows them to safely and effectively transfer the energy from light into electricity. These substances are called semiconductors.Photovoltaic cells use special materials known as semiconductors to absorb the energy of light and convert it into electricity. The most common substance used in PV cells is silicon. Semiconductors used in PV cells must be stable enough to absorb the energy of the light without reflecting it or converting it to heat. The silicon in semiconductors is passed through a special process of polarization, which makes one end positively charged and one end negatively charged. When a circuit is attached to connect the ends to each other, the current can be gathered from the energy the semiconductor collects. source:news chinasun-solar
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