Semiconductor Theory : Introduction

       The materials such as copper, aluminium etc. are good conductors of electricity. While the materials such as wood, glass, mica etc. are very bad conductors of electricity and are called insulators. There is another class of materials, whose conductivity i.e. ability to carry electricity, lies between that of conductors and insulators. Such materials are called semiconductors. Germanium (Ge) and Silicon (Si) are two well known semiconductor materials.
       Alongwith these two basics semiconductor materials, some impurities are used to obtain extrinsic semiconductor materials called n-type and p-type. These two materials are then chemically combined to obtain p-n junction. Such a semiconductor p-n junction forms a popular electronic device called diode.

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