Solar cells



Solar cells 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.

Photovoltaic cells work effectively even in cloudy weather and

unlike solar heaters, are more efficient at low temperatures.

They do their job silently and there are no moving parts to wear

out. It is no wonder that one marvels on how such a device would

function.

To understand how a solar cell works, it is necessary to go

back to some basic atomic concepts. In the simplest model of the

atom, electrons orbit a central nucleus, composed of protons and

neutrons. each electron carries one negative charge and each

proton one positive charge. Neutrons carry no charge. Every atom

has the same number of electrons as there are protons, so, on the

whole,......

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Title: Solar Cells
Approximate Word Count: 1122
Approximate Pages: 5 (250 words per double-spaced page)

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