Electrical characterization of poly(3-methylthiophene) electrosynthesized onto a tin-oxide substrate

We have invest iga ted poly(3-methylthiophene) (PMeT) thin films electroche mically synthesized directly onto a tin-oxide (TO) electrode. We find that the PMeT film thickness depends linearly on the charge density used during the electropolymerization. We have demonstrated that the current transport in PMeT films (solid phase) is space-charge limited or controlled by thermi onic emission. depending on the electrode material. Using TO/PMeT/Ni device s we estimate the positive charge carrier mobility in PMeT to be around 4 x 10(-4) cm(2) V-1 s(-1). and the potential barrier height for positive char ge carrier injection at the Al/PMeT interface to be 0.17 eV.