McColl, Malcolm (1964) Electron current through thin mica films. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-10142002-162916
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Muscovite mica, cleaving every 10[Angstroms], provides a crystalline insulator with uniformly parallel surfaces of well known separation ideally suited to the study of electron transport phenomena. Using a micro-splitting technique similar to that developed by Foote and Kazan, muscovite was cleaved in a vacuum of 10(^6) Torr and metal electrodes evaporated, aluminum on one side, gold on the other. The current through 30 and 40[Angstrom] films was measured as a function of voltage and temperature and analyzed in terms of the tunneling theory of Stratton. Using the actual image-force barrier shape, the approximately symmetrical volt-ampere data gave barrier heights of [?] = 0.95 and 0.93eV for the 40 and 30[Angstrom] films, respectively, for an effective mass ratio of m*/m =0.92. The theoretical temperature dependence was observed in the 40[Angstrom] film from room temperature down to liquid nitrogen temperature (77[degrees]K). Thicker films 50 to 10,000 [Angstroms], exhibited temperature dependent volt-ampere curves linear in log I versus [square root of]V over a factor of 10:1 in voltage and a thermal activation energy of 0.55eV, lower than [t]he barrier height above possibly because of injection into polaron states. Preliminary photoelectric response data yielded [?] = 0.8eV, raising some question as to the real meaning of the [?] found from tunneling theory.
|Item Type:||Thesis (Dissertation (Ph.D.))|
|Degree Grantor:||California Institute of Technology|
|Division:||Engineering and Applied Science|
|Major Option:||Electrical Engineering|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||6 February 1964|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||16 Oct 2002|
|Last Modified:||26 Dec 2012 03:05|
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