%0 Journal Article %A Li, X %A Liu, Z %A Zhou, Z %A Gao, H %A Liang, G %A Rauber, D %A Kay, CWM %A Zhang, P %D 2021 %F discovery:10119138 %J ACS Applied Polymer Materials %K Salts, Plastics, Electrical conductivity, Conjugated polymers, Polymers %N 1 %P 98-103 %T Effects of Cationic Species in Salts on the Electrical Conductivity of Doped PEDOT:PSS Films %U https://discovery.ucl.ac.uk/id/eprint/10119138/ %V 3 %X The electrical conductivity of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films with four salts that have various cations but the same bis(trifluoromethanesulfonyl)amide (TFSI) anion was studied. We found that doping salts of small-sized cations led to better conductivity because of the improved crystalline order and p-doped level of PEDOT, as revealed by the grazing-incidence wide-angle X-ray scattering (GIWAXS) and UV-vis spectrum. This phenomenon can be rationalized with the fact that small-sized cations with stronger Coulombic interactions can lead to high doping and rearrangement of PEDOT:PSS. These findings will help to develop recipes based on the PEDOT:PSS/salt composite toward the applications for printed flexible electronics. %Z This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.