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Updated: Feb 20, 2026

A 3D-printed Chamber for Organic Optoelectronic Device Degradation Testing

A 3D-printed Chamber for Organic Optoelectronic Device Degradation Testing

Published on: August 10, 2018

Structural and Morphological Evolution for Water-resistant Organic Thermoelectrics.

Hyeon Jin Oh^1,2, Jae Gyu Jang³, Jong-Gyu Kim¹

¹Department of Chemistry, Dankook University, Cheonan, Chungnam, 31116, Republic of Korea.

Scientific Reports

|October 18, 2017

Summary

We enhanced the performance of organic thermoelectric devices using Iso-GMA, a crosslinking agent, improving water resistance and thermoelectric properties through optimized PEDOT:PSS morphology.

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Area of Science:

Materials Science
Organic Electronics
Thermoelectric Materials

Background:

Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is a promising organic thermoelectric material.
Improving the water resistance and thermoelectric performance of PEDOT:PSS is crucial for practical applications.

Purpose of the Study:

To investigate the effect of 2,5-bis(2-hydroxy-3-methacryloyloxypropoxy)-1,4:3,6-dianhydro-sorbitol (Iso-GMA) on the structural and morphological evolution of PEDOT:PSS.
To realize water-resistant organic thermoelectric devices with enhanced properties.

Main Methods:

Systematic investigation of Iso-GMA concentrations in PEDOT:PSS films with a fixed volume of dimethyl sulfoxide (DMSO).
Analysis of structural and morphological changes using techniques to understand chemical bonding and evolution.
Evaluation of thermoelectric properties (Seebeck coefficient, power factor) and mechanical strength.

Main Results:

Incorporating 0.8 vol% Iso-GMA and 3.0 vol% DMSO significantly increased the Seebeck coefficient and power factor compared to pristine PEDOT:PSS.
Optimized phase separation and self-assembled, crosslinked fibril networks with densely-packed PEDOT and lamellar-stacked PSS were observed.
Enhanced mechanical strength and water resistance were achieved, with films remaining stable in water and humid conditions.

Conclusions:

Iso-GMA acts as a hydrophilic crosslinking agent, improving PEDOT:PSS morphology and thermoelectric properties.
The developed material exhibits superior water resistance and sustained thermoelectric performance under humid conditions.
This study provides a pathway for developing robust and efficient organic thermoelectric devices.