Brush and Dry: A Posttreatment-Free Simple Process to Pattern PEDOT:PSS Films with Enhanced Thermoelectric...

Area of Science:

• Materials Science
• Organic Electronics
• Energy Harvesting

Background:

• Organic thermoelectric generators (TEGs) offer potential for waste heat recovery.
• Developing scalable manufacturing techniques for high-performance organic TEGs is crucial.
• PEDOT:PSS is a widely studied organic thermoelectric material.

Purpose of the Study:

• To investigate the impact of brush printing on PEDOT:PSS film morphology and thermoelectric properties.
• To establish a relationship between brush-induced morphology and thermoelectric performance.
• To demonstrate a scalable fabrication method for organic TEGs.

Main Methods:

• Utilized brush printing, a meniscus-guided technique, for fabricating PEDOT:PSS films.
• Systematically varied brushing parameters to control solvent evaporation and film morphology.
• Characterized film morphology, including molecular alignment and crystalline packing.
• Measured electrical conductivity and power factor of the resulting films.

Main Results:

• Brush printing enabled precise control over PEDOT:PSS film morphology, including molecular chain extension and anisotropic alignment.
• Optimized brushing conditions led to improved crystalline packing.
• Achieved a 3-fold increase in electrical conductivity (up to 1900 S cm^-1).
• Obtained a high thermoelectric power factor of 170 μW m^-1 K^-2 without wet post-treatments.

Conclusions:

• Brush printing is an effective technique for tuning organic thermoelectric material morphology and performance.
• The optimized morphology significantly enhances electrical conductivity and power factor.
• Brush printing provides a simple, scalable route for producing functional printed thermoelectric generators.