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Development of Efficient OLEDs from Solution Deposition

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Elucidating Design Rules toward Enhanced Solid-State Charge Transport in Oligoether-Functionalized

Abigail A Advincula^1,2,3, Amalie Atassi¹, Shawn A Gregory¹

¹School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

ACS Applied Materials & Interfaces

|July 14, 2023

Summary

This summary is machine-generated.

The EDOT-containing copolymer P(OE3)-E exhibits superior electrical conductivity due to enhanced doping and improved microstructure. This study highlights the importance of EDOT incorporation for designing advanced conductive polymer systems.

Keywords:

charge transport dioxythiophene polymers oligoether side chains solid-state electrical conductivity

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Area of Science:

Materials Science
Polymer Chemistry
Solid-State Physics

Background:

Dioxythiophene-based alternating copolymers are investigated for their charge transport properties.
The influence of different aryl groups (DMP, EDOT, PheDOT) on copolymer properties is explored.

Purpose of the Study:

To investigate the solid-state charge transport properties of oxidized ProDOT-based copolymers.
To correlate structural and doping characteristics with electrical conductivity.
To understand the role of EDOT incorporation in enhancing conductivity.

Main Methods:

Synthesis of P(OE3)-D, P(OE3)-E, and P(OE3)-Ph copolymers.
Electrical conductivity measurements at a fixed dopant concentration (5 mM FeTos3).
UV-vis-NIR and X-ray spectroscopies to assess doping and oxidation.
Wide-angle X-ray scattering (WAXS) for structural analysis (paracrystallinity, π-π stacking).
Application of the semilocalized transport (SLoT) model for parameter calculation.

Main Results:

Electrical conductivities ranged from 9 to 195 S cm-1, with P(OE3)-E showing the highest conductivity.
P(OE3)-E exhibited the highest susceptibility to doping and extent of oxidation.
P(OE3)-E demonstrated lower paracrystallinity and smaller π-π stacking distances, indicating better local ordering and overlap.
SLoT model analysis revealed broader electronic bands and higher carrier ratios for P(OE3)-E.

Conclusions:

EDOT incorporation significantly enhances the electrical conductivity of ProDOT-based copolymers.
Improved conductivity in P(OE3)-E is attributed to enhanced doping, higher carrier ratios, and favorable microstructure (low paracrystallinity, good π-π overlap).
These findings provide valuable structure-property relationships for designing future high-performance conductive polymers.