Thermal Currents from Corona Charged Mylar

Thermal currents have been obtained from corona‐charged Mylar. The results are interpreted in terms of electron and/or ion trapping and subsequent release upon reheating. A theory is developed for thermal release of these ``near surface'' charged specimens when no external field is applied. A new method is presented to obtain energies for a series of peaks present in complex thermal current spectra. The trapping parameters are also determined using both the initial rise analysis of Garlick and Gibson, and the curve fitting technique of Cowell and Woods. The results are consistent with four discrete traps in Mylar at depths of 0.55, 0.85, 1.4 and 2.2 (all ±0.1) eV. The 0.55‐ and 0.85‐eV traps are electronic, that at 1.4 eV is either an electronic trap with a Coulomb barrier, or ionic. The 2.2‐eV trap is either ionic, interfacial, or involves dissociation of a complex with subsequent release of an electron to the conduction band. Assuming that the traps empty under monomolecular conditions, analysis of the ...

[1]  P. Land Equations for thermoluminescence and thermally stimulated current as derived from simple models , 1969 .

[2]  T. Cowell,et al.  The evaluation of thermally stimulated current curves , 1967 .

[3]  L. Monteith Trapping and Thermal Release of Irradiation Electrons from Polyethylene Terephthalate Films , 1966 .

[4]  A. Gibson,et al.  The Electron Trap Mechanism of Luminescence in Sulphide and Silicate Phosphors , 1948 .

[5]  A. C. Lilly,et al.  High‐Field Conduction in Films of Mylar and Teflon , 1968 .

[6]  A. Jonscher Electronic Conduction in Dielectric Films , 1969 .

[7]  R. R. Haering,et al.  Theory and Application of Thermally Stimulated Currents in Photoconductors , 1960 .

[8]  J. Fowler X-ray induced conductivity in insulating materials , 1956, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[9]  K. H. Nicholas,et al.  The evaluation of electron trapping parameters from conductivity glow curves in cadmium sulphide , 1964 .

[10]  J. Hirsch,et al.  Conduction induced by electron bombardment in polymer films , 1969 .

[11]  L. K. Monteith,et al.  Space‐Charge Effects in Insulators Resulting from Electron Irradiation , 1967 .

[12]  M. Perlman,et al.  The Measurement of Surface Charge , 1968 .

[13]  B. Gross Irradiation effects in plexiglas , 1958 .

[14]  R. Bube,et al.  Determination of Electron Trapping Parameters , 1966 .

[15]  A. Jonscher,et al.  Electronic properties of amorphous dielectric films , 1967 .