Simultaneously
Enhancing the Cohesion and Electrical Conductivity of PEDOT:PSS Conductive
Polymer Films using DMSO Additives
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Abstract
Conductive
polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)
(PEDOT:PSS) has attracted significant attention as a hole transport
and electrode layer that substitutes metal electrodes in flexible
organic devices. However, its weak cohesion critically limits the
reliable integration of PEDOT:PSS in flexible electronics, which highlights
the importance of further investigation of the cohesion of PEDOT:PSS.
Furthermore, the electrical conductivity of PEDOT:PSS is insufficient
for high current-carrying devices such as organic photovoltaics (OPVs)
and organic light emitting diodes (OLEDs). In this study, we improve
the cohesion and electrical conductivity through adding dimethyl sulfoxide
(DMSO), and we demonstrate the significant changes in the properties
that are dependent on the wt % of DMSO. In particular, with the addition
of 3 wt % DMSO, the maximum enhancements for cohesion and electrical
conductivity are observed where the values increase by 470% and 6050%,
respectively, due to the inter-PEDOT bridging mechanism. Furthermore,
when OLED devices using the PEDOT:PSS films are fabricated using the
3 wt % DMSO, the display exhibits 18% increased current efficiency