Solar Cells
Beginning of paper
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 paper
.... have
discrete kinetic energy levels, which increase with the orbital radius.
When atoms bond together to form a solid, the electron energy levels merge
into bands. In electrical conductors, these bands are continuous but in
insulators and semiconductors there is an "energy gap", in which no
electron orbits can exist, between the inner valence band and outer
conduction band [Book 1]. Valence electrons help to bind together the atoms
in a solid by orbiting 2 adjacent nucleii, while conduct ....
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Word count: 1165
Page count: 5 (approximately 250 words per page)
