| 초록 |
ITO have been studied widely due to its great conductivity and transmittance for use in various optoelectronic devices. In spite of these advantages, it is difficult to apply flexible devices, because the poor mechanical properties. PEDOT:PSS is the promising conductive polymer to replace ITO for applying flexible devices. In this study, we proposed a simple and effective method to improve the conductivity of PEDOT:PSS thin film that was improved from 2.4 to 856 S/cm by post-treatment 2-Chloroethanol (2-CE). The effect of conductivity improvement was investigated through various techniques including PL, AFM and XPS. Change of the PSS intensity in the film and morphology are the mechanisms for the conductivity improvement. 2-CE treated PEDOT:PSS films also showed high transmittance and low sheet resistance. OPVs, based on highly conductive PEDOT:PSS electrode was fabricated with 2-CE post-treatment that showed better performance compared to DMSO as an additive in PEDOT:PSS electrodes. |
