The ionic mechanism of the electrochemical doping of poly (3–methylthiophene) studied by secondary ion mass spectroscopy (SIMS)

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Abstract
The concentration profiles of C104− and Li+ into the poly(3‐methylthiophene) structure were referred to the 3‐methylthiophene concentration for several doping levels during the doping and the undoping processes. The ion amount is very different in the polymer bulk and in a surface region of about 150 Å thickness. The cation is shown to play a role in the first step of the undoping mechanism. The paired ions concentration was determined and an actual doping ratio could be deduced which is different from that calculated by coulometry.