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<emphasis role="bold">Introduction</emphasis> Photons that are incident on a semiconductor material can be absorbed if their energy lies above the band gap energy. Energy is conserved by the breaking of a bond: that is, the promotion of an electron from the valence band to the conduction band. The presence of these additional charge carriers, one electron and one hole, increases the conductivity o f the semiconductor. This is photoconductivity. If the semiconductor has been processed with ohmic contacts and is placed i…
Thomas P. Pearsall: Photonics Essentials. Photoconductivity, Chapter (McGraw-Hill Professional, 2003), AccessEngineering Export