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 ....
------------------
Word count: 1163
Page count: 5 (approximately 250 words per page)
