Wf. Zhang et al., Photocurrent and differential capacity measurements at polybithienyl and poly(3-butylthiophene) films, J SOL ST EL, 3(3), 1999, pp. 135-140
Photocurrent and differential capacity measurements have been carried out a
t polybithienyl (PBT) and poly(3-butylthiophene) (PBuT) films on platinum.
The photocurrents are cathodic, similar to inorganic p-type semiconductors.
The band gap energy was determined from the photocurrent spectra (E-g = 1.
7 eV for PET and E-g = 1.9 eV for PBuT). The dependence of the differential
capacity on the potential could be presented as Mott-Schottky plot, at lea
st in a limited potential region. The flatband potential was determined (E-
fb = 0.67 V for PET and E-fb = 0.58 V for PBuT).