Posted on: November 17, 2010

•The semiconductor P-N Junction provides those three mechanisms
•Semiconductors are characterized by a band gap.
–A range of forbidden energies for electrons
–Separates the Valence band from the Conduction band
•Valence bands are normally full
•Conduction bands are normally empty
•Semiconductors typically have a band gap of around 1eV
•They are temperature and purity dependent
•At low temperature they act as insulators
•By supplying energy to them they can act as conductors
•The band gap is a result of the structure of the material
•All of the valance electrons are used in bonding.
•The conduction band is empty.
•By transferring energy to the electrons they can be promoted into the conduction band where they are free to move.
•This generates Electron-Hole Pairs

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