Study on the effect of DMSO on the changes in the conductivity of PEDOT:PSS

There is a growing interest in the change in the conductivity of the conductive polymer Poly(3,4-ethylenedioxythiophene):poly-(styrenesulfonate) (PEDOT:PSS). However, there is lack of research on the change in the conductivity of organic-based conductive materials compared to inorganic-based conductive materials. This study looks at the change in the conductivity of PEDOT:PSS with dimethyl sulfoxide (DMSO) mixing. The 4-point probe was used for observing the sheet-resistance changes. The relational degree of doping of PEDOT:PSS was confirmed by use of the Raman spectra. From the study, it was confirmed that PSS decreased in the UV-Vis spectra. We also observed that topology changes with the amount of DMSO through the AFM image. From the whole mobility and these analyses, we propose a reasonable conductive improvement mechanism of PEDOT:PSS.