Properties of electrochemically n-type doped poly(isothianaphthene)

The electrochemical and optical properties of poly(isothianaphthene), PITN, during electrochemical doping have been investigated by cyclic voltammetry and optical absorption spectrum measurements. PITN can be reversibly n- and p-type doped without the decomposition of the material. This polymer with these two reversible and stable redox states of different colors is a potential candidate for electrochromic displays. The existence of a residual charge depending on the electrochemical cycle is pointed out and conditions to obtain the more or less full neutralization of this residual charge are described. Furthermore, a writing-reading device using a residual charge which remains PITN after the dedoping has also been proposed