| 초록 |
Conducting polymers (CPs) possess solution processability that has provided economic effects in the fabrication of electronic devices. However, CPs exhibit undesirable features, including limited intermolecular interaction and molecular packing, which result in inferior charge transport and electrical conductivity (σdc). Thus, it is an important issue for enabling the formation of well-ordered structures from solution processable CPs to achieve high-performance organic conductors. Herein, we demonstrate that the highly ordered nano-fibrillar structure of PEDOT:PSS was induced by controlling the electrostatic interaction between PEDOT and PSS, by using ionic liquids. As a result, the resulting highly ordered molecular packing with a very small π-π stacking distance » 3.38 Å causes a maximum σdc » 2100 S cm-1. Using the PEDOT:PSS/IL composite as a transparent electrode, we fabricated ITO-free polymer solarcells with power conversion efficiency of 7.63%. |
