Polymer-metal granular thin films were grown by simultaneous ion beam sputtering from a composite target. Morphological analysis performed by transmission electron microscopy shows their granular fine structure. The samples' ageing process was monitored over an interval of many hours after the film deposition. A detailed study of the resistance vs. temperature behaviour was performed over the range 12-300 K; current-voltage measurements as a function of temperature are also reported. An unusual ln(R) proportional T-1 dependence was found at low temperature. This behaviour is explained with theoretical arguments based on percolation theory.
LOW-TEMPERATURE BEHAVIOR OF ION-BEAM-GROWN POLYMER METAL COMPOSITE THIN-FILMS
BRUSCHI, PAOLO;NANNINI, ANDREA;
1991-01-01
Abstract
Polymer-metal granular thin films were grown by simultaneous ion beam sputtering from a composite target. Morphological analysis performed by transmission electron microscopy shows their granular fine structure. The samples' ageing process was monitored over an interval of many hours after the film deposition. A detailed study of the resistance vs. temperature behaviour was performed over the range 12-300 K; current-voltage measurements as a function of temperature are also reported. An unusual ln(R) proportional T-1 dependence was found at low temperature. This behaviour is explained with theoretical arguments based on percolation theory.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
