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The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Highly Conductive PEDOT:PSS Thin Films with Two-Dimensional Lamellar Stacked Multi-Layers.

Youngno Kim¹, Yunryeol Kim¹, Jung Hyun Kim¹

¹Department of Chemical and Biomolecular Engineering, Yonsei University, 134 Shinchon-Dong, Seodaemoon-Gu, Seoul 03722, Korea.

Nanomaterials (Basel, Switzerland)

|November 11, 2020

Summary

Researchers improved the electrical conductivity of conjugated polymers like PEDOT:PSS. A novel etching and layer-by-layer process created ordered thin films, significantly boosting charge carrier mobility and conductivity for advanced organic electronics.

Keywords:

PEDOT:PSS carrier mobility conjugated polymers electrical conductivity organic electrode

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Area of Science:

Materials Science
Organic Electronics
Polymer Chemistry

Background:

Conjugated polymers offer solution processability, low cost, and transparency for organic electrode applications.
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is highly applicable but limited by heterogeneous structure and low electrical conductivity.
Improving PEDOT:PSS conductivity is crucial for enhancing organic electronic device performance.

Purpose of the Study:

To develop a facile method for fabricating highly ordered multi-layered PEDOT:PSS thin films.
To enhance the electrical properties of PEDOT:PSS by improving molecular ordering and charge carrier mobility.
To optimize the fabrication process for superior electrical conductivity in conjugated polymer films.

Main Methods:

Fabrication of multi-layered PEDOT:PSS thin films using a layer-by-layer (LBL) process.
Employing an etching process with sulfuric acid (H2SO4) and dimethyl sulfoxide (DMSO) to remove insulating poly(styrenesulfonate) (PSS) and rearrange PEDOT structures.
Optimizing film thickness and utilizing repetitive etching and LBL steps to enhance carrier mobility.

Main Results:

Achieved a significant improvement in charge carrier mobility from 0.62 to 2.80 cm^2 V^-1 s^-1.
Fabricated two-dimensional lamellar-stacked PEDOT:PSS thin films with enhanced morphology and crystallinity, confirmed by XPS, Raman, and XRD.
Obtained an excellent electrical conductivity of 3026 S cm^-1, a 3.8-fold increase compared to the pristine film (801 S cm^-1).

Conclusions:

The combined etching and LBL process effectively enhances the electrical conductivity of PEDOT:PSS films.
The developed method yields highly ordered, two-dimensional lamellar-stacked structures with significantly improved charge transport properties.
This approach offers a promising route for developing high-performance organic electrode materials for various electronic applications.