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Solar Cells
Beginning of essay
today are mostly made of silicon, one of the most common
elements on Earth. The crystalline silicon solar cell was one of the first
types to be developed and it is still the most common type in use today. They do
not pollute the atmosphere and they leave behind no harmful waste products.
Photovol ....
Middle of essay
....terial.
In semiconductors, the materials from which solar sells are made, the
energy gap Eg is fairly small. Because of this, electrons in the valence band
can easily be made to jump to the conduction band by the injection of energy,
either in the form of heat or light [Book 4]. This explains why the high
resistivity of semiconductors decreases as the temperature is raised or the
material illuminated. The excitation of valence electrons to the conduction band
is best accomplished when the s.... |
| Number of words: 1163 |
Approximate pages: 5 |
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