| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1666391 | Thin Solid Films | 2013 | 4 Pages |
•The doping mechanism for TiO2–doped PEDOT:PSS samples was investigated.•TiO2 doping may lead to decreased carrier concentration of PEDOT:PSS.•The domination of tunneling (hopping) at low (high) temperatures was observed.•The enhanced mobility is attributed to the weak local electron–phonon coupling.
The doping mechanism for composite poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) films having TiO2 nanoparticles, denoted TiO2-doped PEDOT:PSS, is investigated in this study. It is shown that TiO2 doping may lead to decreased carrier concentration, owing to a combined effect of the high activation energy and changes in the chemical structure of PEDOT:PSS. The carrier mobility in PEDOT:PSS samples exhibits unexpectedly strong temperature dependence, implying the domination of tunneling (hopping) at low (high) temperatures. An exhibition of high mobility of TiO2-doped PEDOT:PSS samples is attributed to the weak local electron–phonon coupling.
