Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 1, Pages 302-310Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b08753
Keywords
DMSO; PEDOT:PSS; cohesion energy; electrical conductivity; OLED; DCB test
Funding
- Graphene Materials and Components Development Program of MOTIE/KEIT [10044412]
- Basic Science Research Program - National Research Foundation under the Ministry of Science, ICT & Future Planning, Korea [2015R1A1A1A05001115, 2015R1A2A1A05001840]
- Development Program of Mass Production Process for Next Generation Flexible Transparent Electrode Film in the Institute for Startup KAIST (ISK) - National Research Foundation under the Ministry of Science, ICT & Future Planning, Korea [N01150031]
- Global Frontier R&D Program in the Center for Multiscale Energy System - National Research Foundation under the Ministry of Science, ICT & Future Planning, Korea [2011-0031569]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10044412] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2015R1A2A1A05001840, 2011-0031569] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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