Accession Number : ADA119896

Title :   Photo Field Emission and Field Emission Energy Distributions from Silicon.

Descriptive Note : Doctoral thesis,


Personal Author(s) : Herman,Michael H

PDF Url : ADA119896

Report Date : 13 Jul 1982

Pagination or Media Count : 151

Abstract : Experimental field emission energy distributions (FEEDs) are reported for both n- and p-type samples of low resistivity. The experimental distributions are characterized by a high intensity single peak, of energy 0.4 eV or more below the Fermi level, with a subsidiary peak of lower intensity, rising from just below the Fermi level. The larger peak drops in energy with increasing field. Experimental FEEDs are compared to those expected theoretically. It is concluded that they are not similar. Comparison with photoemission work indicates that the large peak is due to a band of surface acceptor states. The subsidiary peak is tentatively ascribed to conduction band electrons. Finally, a phenomenological model of photo-field emission (PFE) is proposed. Based upon both FEED and PFE experiments, this model assumes that emission occurs primarily from surface states. A second component of the current is due to tunnelling of photogenerated electrons. In addition to photoconductivity, a self-regulating break-down mechanism is necessary for qualitative agreement with experimental data. One such mechanism, avalanche, is investigated for the dielectric emitter model. Qualitative agreement is obtained with the characteristic non-linear Fowler-Nordheim behavior observed experimentally.

Descriptors :   *Emission spectra, *Photoelectron spectra, *Silicon, *Field emission, Field conditions, Distribution, Photoconductivity, Dielectrics, Band spectra, Emitters, Models, Conduction bands, Theses, Fermi surfaces, Photoelectric emission, Semiconductors, Peak values, High rate, Intensity, Low intensity, Experimental data

Subject Categories : Radiation and Nuclear Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE