Investigation of the electrical properties of metallic nanoclusters
- 146 Downloads
Palladium nanoclusters were prepared by magnetron sputtering and inert gas condensation technique and deposited between two gold electrodes. We have investigated the current-voltage characteristics at temperatures between 45 and 300 K. The conduction-voltage profile allows calculating the number of potential barriers, n electrons have to cross while conducting through a percolation path. n is found to increase with decreasing temperature. The observed temperature dependence of the conductance is Arrhenius-like above 140 K, with activation energy much smaller than the calculated Coulomb blockade energy. It suggests that some of the nanoclusters are fused together. At temperatures below 140 K the conductance-temperature data was fitted with Efros-Shklovskii model for conduction where variable range hopping is dominating the electron transport mechanism. The presence of variable range hopping may interpret the increase of n with decreasing temperature.
KeywordsBias Voltage Magnetron Sputtering Coulomb Blockade Main Chamber Percolation Path
- 19.N.F. Mott, E.A. Davis, Electronic Processes in Non-Crystalline Materials (Clarendon, New York, 1979)Google Scholar
- 20.B.I. Shklovskii, A.L. Efros, Electronic Properties of Doped Semiconductors (Springer-Verlag, Berlin, 1984)Google Scholar
- 23.P.W. Anderson, Phys. Rev. 109, 1429 (1958)Google Scholar