Fig. 4: Spectroelectrochemical measurements of PEDOT:ClO4 films electrodeposited from a 100 mM dopant solution.
From: Robust and flexible organic electrochemical transistors enabled by electropolymerized PEDOT

Real-time absorption spectra during a dedoping (+0.4 to −1.0 V) and b redoping (−1.0 to +0.4 V) presented with 0.1 V increments. c top layer: voltage sweep, lower layer: temporal behavior of the three wavelengths chosen as representative of neutral chains (621 nm), polarons (801 nm), and polarons + bipolarons (1000 nm).