Organic nano-transistor fabricated by co-evaporation method under alternating electric field

We have fabricated the organic conductive wires and nano-transistors using co-evaporation method of tetrathiafulvalene (TTF) and tetracyanoquinodimethane (TCNQ) under AC electric field. Needle-like crystals of TTF-TCNQ charge transfer complex grow from an edge of gold electrodes along the electric field. The frequency dependence of the growth time of molecular wires indicates that AC electric field around 100 Hz is the most effective for making connected wires. Many connected wires were highly conductive which did not show any modulation of electrical conductivity with the gate voltage. However N-channel field effect transistor characteristics were observed with improvements of growth sequence. It is suggested that a tiny semiconductor area is formed at the connecting point of two conductive molecular wires.