Study on the disparate transition behaviors of the electrical/physical properties in PEDOT:PSS film depending on solvent species under a follow-up solution-treatment process
| Autor: | JaeGwan Chung, Hyukju Kwon, Daeun Yu, Seong Heon Kim, Yongsu Kim, Sung Heo, Dong-Jin Yun, Jung-Hwa Kim, Minsu Seol, Yongnam Ham |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Mechanical Engineering Solvation Bioengineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Solvent Organic semiconductor chemistry.chemical_compound Adsorption Chemical engineering chemistry Polymerization PEDOT:PSS Mechanics of Materials Polymer chemistry General Materials Science Electrical and Electronic Engineering Solvent exposure Solubility 0210 nano-technology |
| Zdroj: | Nanotechnology. 27:165706 |
| ISSN: | 1361-6528 0957-4484 |
| DOI: | 10.1088/0957-4484/27/16/165706 |
| Popis: | In most solution-processed organic devices, a poly(3,4-ethylenedioxythiophene) (PEDOT) polymerized with poly(4-styrenesulfonate) (PSS) film is inevitably affected by various conditions during the subsequent solution-coating processes. To investigate the effects of direct solvent exposure on the properties of PEDOT polymerized with PSS (PEDOT:PSS) films, photoemission spectroscopy-based analytical methods were used before and after solvent-coating processes. Our results clearly indicate that PEDOT:PSS films undergo a different transition mechanism depending on the solubility of the solvent in water. The water-miscible solvents induce the solvation of hydrophilic PSS chains. As a result, this process allows the solvent to diffuse into the PEDOT:PSS film, and a conformational change between PEDOT and PSS occurs. On the other hand, the water-immiscible organic solvents cause the partial adsorption of solvent molecules at the PE surface, which leads to changes in the surface properties, including work function. Based on our finding, we demonstrate that the energy-level alignments at the organic semiconductor/electrode interface for the PEDOT:PSS films can be controlled by simple solvent treatments. |
| Databáze: | OpenAIRE |
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