Model of the electrochemical conversion of an undoped organic semiconductor film to a doped conductor film

TL;DR

This paper presents a comprehensive model for the electrochemical doping process in organic semiconductors, accurately capturing the doping front dynamics in light-emitting electrochemical cells.

Contribution

It introduces a novel model that incorporates concentration-dependent mobility, diffusion, and the Nernst equation to describe doping in organic semiconductors.

Findings

Model accurately predicts doping front progression.

Incorporates concentration-dependent mobility and diffusion.

Aligns well with experimental observations.

Abstract

We develop a model describing the electrochemical conversion of an organic semiconductor (specifically, the active material in a light-emitting electrochemical cell) from the undoped non-conducting state to the doped conducting state. The model takes into account both strongly concentration-dependent mobility and diffusion for the electronic charge carriers and the Nernst equation in the doped conducting regions. It is demonstrated that the experimentally observed doping front progression in light-emitting electrochemical cells can be accurately described with this model.