Tuning effective hyperfine fields in PEDOT:PSS thin films by doping

TL;DR

This study shows that doping PEDOT:PSS with ethylene glycol can tune hyperfine fields via motional narrowing, impacting properties like magnetoresistance and spin diffusion in organic semiconductors.

Contribution

It introduces a method to control hyperfine fields in organic semiconductors through doping, enabling tuning of their magnetic and spin-related properties.

Findings

Doping with ethylene glycol reduces hyperfine fields in PEDOT:PSS.

Doping induces motional narrowing of local charge carrier fields.

Potential to modulate magnetoresistance and spin diffusion in organic devices.

Abstract

Using electrically detected magnetic resonance spectroscopy, we demonstrate that doping the conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) with ethylene glycol allows for the control of effective local charge carrier hyperfine fields through motional narrowing. These results suggest that doping of organic semiconductors could enable the tuning of macroscopic material properties dependent on hyperfine fields such as magnetoresistance, the magneto-optical responses and spin-diffusion.