Electric field induced effects in Y3N@[C80]6- anionic solid.

By measuring the i-v characteristics of Y3N@[C80]6- anionic solid at various temperatures and electric field strengths, four conducting phases with i∞v , i∞v2 with low resistance, i∞v4 and i∞v2 with high resistance were observed. First, at temperatures below 100K and field strengths below 30 Vcm-1, the current passing through the sample was a linear function of the d.c. bias voltage due to free moving charges. Second, at the same field strengths, the trapped carrier was thermally activated with activation energies of 13.6meV for temperature range of 100-250 K and 88.7meV for 250-450 K. In this conducting phase, the carrier transport was governed by space charge limited conduction mechanism. Third, when the electric field increased from 30 to 120 Vcm-1, the i became a quartic function of the v because the carrier mobility is a quadratic function of the field strength. A conducting phase with high resistance was observed at temperatures below 100K. The trapped carrier was thermally activated with activation energies of 146.5meV for temperature range of 100-250K and 288.5meV for 250-450K. Finally, in the electric field strengths of 120-2000 Vcm-1, a high resistance phase appeared in the anionic solid at temperatures below 100K. The current was a quadratic function of the d.c. bias voltage, and the carrier mobility was independent of the field strength [ABSTRACT FROM AUTHOR]