The study of electricity has since been limited to the nature of current on conductors and insulators until when researchers decided to explore more on semiconductors. Materials whose conductivity falls between those of conductors and insulators are called semiconductors. Semiconductors are “part-time” conductors whose conductivity can be controlled.
Silicon is the most common material used to build semiconductor devices. Si is the main ingredient of sand and it is estimated that a cubic mile of seawater contains 15,000 tons of Si. Si is spun and grown into a crystalline structure and cut into wafers to make electronic devices.
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