Edge definde Film Growth, A method for making sheets of polycrystalline silicon in which molten silicon is drawn upward by capillary action through a mold.
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Electrolyte
A non-metallic (liquid or solid) conductor that carries current by the movement of ions (instead of electrons) with the liberation of matter at the electrodes of an electrochemical cell.
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Energy
The ability to do work. Stored energy becomes working energy when we use it.
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Energy density
The ratio of energy available from a battery to its volume (Wh/1) or mass (Wh/kg). "watts to weight" ratio.
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Equalization Charge
The process of mixing the electrolyte in batteries by periodically overcharging the batteries for a short time.
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EVA
(ETHYLENE VINYL ACETATE) An encapsulant used between the glass cover and the solar cells in PV modules. It is durable, transparent, resistant to corrosion, and flame retardant.
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Fill Factor (FF)
For an I-V curve, the ratio of the maximum power to the product of the open-circuit voltage and the short-circuit current. Fill factor is a measure of the "squareness" of the I-V curve.
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Frequency
The number of repetitions per unit time of a complete waveform, expressed in Hertz (Hz).
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Gallium Arsenide (GaAs)
A crystalline, high-efficiency compound used to make certain types of solar cells and semiconductor material.
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Gassing
The evolution of gas from one or more of the electrodes in the cells of a battery. Gassing commonly results from local action self-discharge or from the electrolysis of water in the electrolyte during charging.