PRESSURE-DEPENDENT CONDUCTIVITY OF BO-C(10)TCNQ

The conductivity as a function of pressure of bis(ethylenedioxy)tetrat hiafulvalene 2-decyl-7,7,8,8-tetracyanoquinodimethane mono/multilayer film is reported, First conductivity is measured on the water in the L angmuir-Blodgett trough starting from separate molecules. Secondly mon olayers were collected on a solid substrate and separate conductivity measurements under hydrostatic pressure (0 - 14.5 kbar) were made. The ambient pressure conductivity of the 20 monolayer films increased mor e than one order of magnitude from that of the monolayer conductivity at the air/water interface: similar to 0.6 S/cm. The conductivity was further increased by the hydrostatic pressure (similar to 2 at 10 kbar ). At the same time the temperature of the maximum conductivity begun to shift to higher temperatures after 6 - 8 kbar. Thermal fluctuation induced tunnelling model describes well the conductivity behaviour und er hydrostatic pressure at low temperatures.