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Dark injections download
Dark injections download







dark injections download

The experimental realization of injection and extraction by ohmic and blocking contacts are reviewed in the chapter for the different types of photoconduction measurements and photoconductor materials. The impact of carrier injection and extraction by the contacts on the photoconductive gain are discussed. The chapter discusses the photoconductor–metal contact under the application of an externally applied voltage. Complications of the simple uniform-field case are expected for insulating large-band-gap photoconductors with which the chapter is mainly concerned. The contact space–charge layer extends more deeply into the photoconductor for insulating than for highly conducting material. If the carrier concentration at the photoconductor–metal interface is assumed to be fixed to its dark value because of a high interface recombination rate, the chapter presents the potential distribution of an n-type photoconductor in the vicinity of the cathode under applied voltage. A metal contact introduces an inhomogeneity into the photoconductor. Photoconduction in semiconductors occurs because of a change of the free-charge carrier concentration upon irradiation with light or with particles, such as electrons.









Dark injections download