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- W1793708001 abstract "Thin films of mica have unique attributes that areexceptionally good for studies of high-field conductionmechanisms in thin-film insulators and thequantum mechanical tunneling of electrons frommetal to metal. The principal advantages of usingmica films are that the films are crystalline andthe cleavage planes occur every 10A. This propertyresults in films whose thicknesses are integralmultiples of lOA and whose surfaces are uniformlyparallel over sizable areas. Hence, very well-definedmetal-mica-metal strutures are possible.Furthermore, the fact that the insulator is splitfrom a bulk sample allows the index of refraction,dielectric constant, forbidden energy gap, andtrapping levels and their density to be obtaineddirectly from measurements performed on thicksamples of mica rather than requiring that theseproperties be inferred from the conduction characteristicsalone. In the work to be described, allthe cleaving was done in a high vacuum just priorto the evaporation of metal electrodes so as to avoidair contamination at the interfaces. Results ofthese studies indicate that the current through the30 and 40A films exhibited quantitative agreementwith the theoretical voltage and temperature dependencederived by Stratton for the tunneling ofelectrons directly from metal to metal. Thickerfilms at room temperature exhibited volt-amperecurves suggesting Schottky emission of electronsfrom the cathode into the conduction band of mica.However, the thermal activation energy was smallerthan that found from other measurements, and theexperimental Schottky dielectric constant waslarger than the square of the index of refraction.These facts would indicate that the electrons werebeing injected into polaron states in the insulator.At low temperatures and high fields, the currentthrough the thicker films did not exhibit the Fowler-Nordheim dependence as would be predicted by asimple extention of the theory of field emission intoa vacuum." @default.
- W1793708001 created "2016-06-24" @default.
- W1793708001 creator A5019905406 @default.
- W1793708001 date "1964-01-01" @default.
- W1793708001 modified "2023-09-23" @default.
- W1793708001 title "Electron current through thin mica films" @default.
- W1793708001 doi "https://doi.org/10.7907/7enx-8503." @default.
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