Transcription of Unit –IV Semiconductors Engineering Physics
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Unit –IV Semiconductors Engineering Physics
unit IV Semiconductors Engineering Physics Dr. Reddy , PhD Website: Page 1 Introduction A semiconductor is a material that has a resistivity lies between that of a conductor and an insulator. The conductivity of a semiconductor material can be varied under an external electrical field. Devises made from semiconductor materials are the foundation of modern electronics, including computer, radio, telephones and many other devises. In a metallic conductor, current is carried by the flow of electrons. In Semiconductors , current can be carried by either flow of electrons or flow of holes or both. Germanium and Silicon are the best examples for semiconductor materials. Both are tetravalent ( four valence electrons) and both have diamond crystal structure. At T=0K, the semiconductor acts as insulator. Semiconductors are classified into two types, they are 1.
Unit –IV Semiconductors Engineering Physics Dr. P.Sreenivasula Reddy M.Sc, PhD Website: www.engineeringphysics.weebly.com Page 1 Introduction A semiconductor is a material that has a resistivity lies between that of a conductor and an insulator.
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