PEDOT:PSS Conductivity Enhancement through Addition of the Surfactant Tween 80

Area of Science:

• Materials Science
• Polymer Chemistry
• Conducting Polymers

Background:

• Indium tin oxide (ITO) is a common transparent conductive material.
• PEDOT:PSS is a promising alternative to ITO due to lower costs.
• Additives can enhance PEDOT:PSS properties like conductivity and processability.

Purpose of the Study:

• To investigate the effect of Tween 80 on PEDOT:PSS film properties.
• To understand the mechanism behind conductivity enhancement.
• To assess the viability of PEDOT:PSS for flexible electronics applications.

Main Methods:

• Fabrication of PEDOT:PSS films with varying Tween 80 concentrations.
• Sheet resistance measurements.
• X-ray diffraction (XRD), Raman spectroscopy, and atomic force microscopy (AFM) for structural analysis.
• Rheological property and surface tension measurements.

Main Results:

• Tween 80 decreased PEDOT:PSS sheet resistance from ~1000 to 76 Ω□⁻¹ at 2.67 wt%.
• XRD, Raman, and AFM revealed Tween 80 induced phase separation and structural ordering.
• Tween 80 improved rheological properties and reduced surface tension.

Conclusions:

• Tween 80 is an effective additive for enhancing PEDOT:PSS conductivity and processability.
• The structural ordering of PEDOT and PSS components is key to conductivity improvement.
• Modified PEDOT:PSS is more suitable for coating commodity polymers, enabling flexible electronic devices.