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Photoconductivity

  • Karl W. Böer
  • Udo W. PohlEmail author
Living reference work entry

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Abstract

Free carriers, causing an increase in electrical conductivity, can optically be generated either intrinsically by band-to-band absorption or extrinsically involving defect states in the bandgap. Photoconductivity provides information about carrier excitation and relaxation processes and hence about electronically significant imperfections. Photoconductors can be substantially sensitized by doping with slow recombination centers. An exceedingly long dwell time for carriers captured in traps may induce persistent photoconductivity. A related very small recombination cross-section occurs for deep impurities with a large lattice relaxation. Photoconductivity can be quenched (reduced) by a shift of minority carriers from predominantly slow to fast recombination centers. Such a shift can be induced optically with additional long-wavelength light, as well as thermally or by an electric field.

Keywords

Activator Capture cross-section Extrinsic photoconductivity Intrinsic photoconductivity Negative photoconductivity Persistent photoconductivity Photoconductivity Photo-ionization cross-section Quenching Recombination center Sensitization Trap 

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Copyright information

© Springer International Publishing AG 2020

Authors and Affiliations

  1. 1.NaplesUSA
  2. 2.Institut für Festkörperphysik, EW5-1Technische Universität BerlinBerlinGermany

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