Conductive thin films of bis(ethylenedithio)tetrathiafulvalene salt fabricated by a successive dry-wet process

Abstract

Conductive molecular thin films of a BEDT-TTF [bis(ethylenedithio)tetrathiafulvalene] salt have been fabricated by a successive dry-wet process. Neutral BEDT-TTF molecules were evaporated onto an electrode-coated substrate under ultrahigh-vacuum conditions. Then an electrochemical doping process was carried out: the as-deposited film was immersed in an aqueous solution of LiClO4 and was doped with ClO4− anions. The lateral conductivity of the film was in the range 10−3–10−4 S/cm at room temperature. We have demonstrated that the successive dry-wet process has the potential to be a versatile technique to fabricate conductive thin films based on BEDT-TTF salts.