The poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonic acid) (PEDOT/PSS), in the form of aqueous dispersion of colloidal gel particles, had advantages as a cathode of aluminum solid capacitors due to facile fabrication and high material efficiency and cost performance. In this study, different grades of PEDOT/PSS with various conductivities and particles sizes were used to fabricate the capacitors, and equivalent series resistance (ESR) and capacitance (Cap) were evaluated. It

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... s found that electrical conductivity of the PEDOT/PSS significantly increased by adding ethylene glycol and dimethyl sulfoxide, which reduced the ESR of capacitors at 1 MHz regardless of the particle size. On the other hand, the use of PEDOT/PSS with smaller particle size to fill in the pores of the etched aluminum electrode resulted in a decrease in ESR and increase of Cap at 120 Hz.