Space‐Charge Polarization in Glass Films
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6.In this treatment the diffusion term in the transport equation is assumed negligible in comparison to the field term. This assumption seems reasonable because in the thin films we deal with fields of the order of to Its validity is, in fact, borne out by the agreement with experiment.
7.The general case is considerably more complicated and is treated in the Appendix.
8.W. A. Pliskin and E. E. Conrad, Electrochem. Technol. 2, 196 (1964).
9.As the polarization builds up, the field in the bulk of the glass decreases from a value of the order of to zero. A mobility which decreases with decreasing field could give rise to the curvature in Fig. 6. The condition for a mobility independent of field is Estimating q as twice the electronic charge, a as 5 Å, and using the above value of E, one gets Since this is of the same order as the thermal energy, it is not unreasonable to assume that μ varies enough with field to account for the observed curvature. We would like to thank Dr. D. R. Kerr for suggesting this possibility.
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