Highly Conductive Poly(3,4-ethylenedioxythiophene):Poly (styrenesulfonate) Films Using l-Ethyl-3-methylimidazolium Tetracyanoborate Ionic Liquid

摘要

Highly conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films are obtained using ionic liquids as additives. Upon adding l-ethyl-3-methylimidazolium tetracyanoborate (EMIM TCB) to the conducting polymer, the conductivity increases to 2084 S cm~(-1); this is attributed to the phase separation of PSS leading to a structural change in the film. A comparative study with l-butyl-3-methyl imidazolium tetrafluoroborate (BMIM BF_4) shows that EMIM TCB gives higher conductivity and transmittance and can be regarded as one of the most promising additives for the preparation of indium tin oxide (ITO)-free organic devices using PEDOT:PSS/EMIM TCB as electrodes.