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Distance-resilient conductivity in p-doped polythiophenes

delete2025-08-25
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OA
AI
E
Eva Röck
D
Demetra Tsokkou
M
Maximilian Horn
S
Sepideh Zokaei
R
Renee Kroon
J
Jesika Asatryan
J
Jaime Martín
C
Christian Müller
M
Martijn Kemerink
N
Natalie Banerji
DOI：10.1039/D5MH00620Adelete
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Abstract

Abstract

En 中文
Scalable organic electronic devices necessitate effective charge transport over long distances. We assess here the conductivity and its distance-resilience in doped polythiophene films with alkyl and oligoether side chains. We find that the polymers with oligoether side chains retain 80-90% of the conductivity over five orders of magnitude in distance (from tens of nanometers to millimeters); when doped with 2; 3; 5; 6-tetrafluoro-tetracyanoquinodimethane (F4TCNQ). For P(g42T-T) co-processed with F4TCNQ; this leads to an over 100 times enhanced long-range conductivity (43 S/cm) compared to doped poly(3-hexylthiophene) (P3HT; 0.2 S/cm). Optimization of the oligoether side chain length and doping protocol pushes the conductivity to 330 S/cm. Kinetic Monte Carlo simulations of nanoscale terahertz conductivity data reveal that the local mobility of the doped P(g42T-T):F4TCNQ film benefits from a higher dielectric constant (reduced Coulomb binding to the ionized dopant) and from lower energetic disorder. Those benefits persist on the macroscopic scale; while spatial charge confinement and a lack of connectivity hinder the long-range transport of moderately doped P3HT:F4TCNQ. However; strongly doping P3HT using Magic Blue leads to enhanced conductivity with distance resilience >80%. The distance-resilience is generalized for different polymer:dopant systems once a highly conductive regime (> 30 S/cm) is reached. This highlights an effective strategy to overcome limitation in terms of electrostatic binding and multi-scale polymer ordering; enhancing both the short-range and the long-range conductivity of doped conjugated polymers.
Keywords:
conductivity
doped polythiophene
long-range transport
oligoether side chains
charge mobility

Journal

Materials Horizons cover
Materials Horizons
IF:
10.7
Papers:
3.6K
Citations:
2.4W

Organization

No organization information available