The Doping of SemiconductorsThe addition of a small percentage of foreign atoms in the regular crystal lattice of silicon or germanium produces dramatic changes in their electrical properties, producing n-type and p-type semiconductors. |
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P- and N- Type Semiconductors
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N-Type Semiconductor
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P-Type Semiconductor
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Bands for Doped SemiconductorsThe application of band theory to n-type and p-type semiconductors shows that extra levels have been added by the impurities. In n-type material there are electron energy levels near the top of the band gap so that they can be easily excited into the conduction band. In p-type material, extra holes in the band gap allow excitation of valence band electrons, leaving mobile holes in the valence band. |
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