Semiconductor/conjugated polymer/electrolyte interfaces studied with infrared photospectroelectrochemistry

The photoinduced formation of charge carriers in polyethylenedioxythiophene (PEDOT) on a Ge electrode in contact with the electrolyte solution under applied potential are studied by in situ IR spectroscopy. Difference spectra between illumination and dark show the formation of positive charge carriers in the neutral (undoped) form, wheras no significant spectral changes occur in the oxidized (p-doped) and reduced (n-doped) forms of PEDOT.