Fig. 5: Spectroelectrochemistry of the P-x% PTHF films.

a Set up of operando spectroelectrochemistry study of PEDOT:Tos/PTHF film with different compositions. b The pattern of the stepwise bias that was applied on the working electrode (P-x% PTHF). c, d UV-Vis-NIR absorbance of PEDOT:Tos and P-80% PTHF after the electrical bias has been removed.