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Electrical field-effect of polyvinylidenefluoride (PVF2)
Authors:Hofmann  R  Fuhrmann  J
Institution:(1) Fachbereich Chemie, Universität Kaiserslautern, D-6750 Kaiserslautern
Abstract:Summary By means of modified field-effect measurements the properties of space charge distribution in polymers at the polymer-metal interface have been investigated. In general, these properties are due to excess charge and/or dipole orientation. The superposition of both effects is investigated in PVF2 (phase-II) in order to show whether the conformational PVF2 properties in the crystalline or in the noncrystalline regions control the space charge distribution. In the temperature region 60 °C <T < 90 °C and for times greater than 60 sec the space charge properties are significant influenced by additional dipole relaxations which result from the beginning chain mobility within the crystallites of PVF2. In the time interval 1 sec <t < 60 sec charge carrier injection at the PVF2-gold contact can be described by the Richardson-Schottky theory. Based on this theory, a plot of reduced current versus reduced field is presented displaying all experimental data obtained at various temperatures and field-strength on a single curve. No clear distinction can be given in this case between bulk-limited and electrode-limited processes.With 6 figures
Keywords:Field-effect  charge injection  space charge relaxation  dipole relaxation polyvinylidenefluoride
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