In situ determination of the energy dependence of the high-frequency mobility in polymers

TL;DR

This paper introduces a novel in-situ method combining electrochemical gating and quasi-optical measurements to determine the energy dependence of high-frequency mobility in polymers, revealing insights into local order and transport properties.

Contribution

The paper presents a new experimental approach to measure the energy dependence of high-frequency mobility in disordered polymers using combined electrochemical and optical techniques.

Findings

Mobility in OC_1C_10-PPV is at least 0.1 cm^2V^-1s^-1.

Method allows probing of local order effects on transport.

In-situ measurements enable detailed energy dependence analysis.

Abstract

The high-frequency mobility in disordered systems is governed by transport properties on mesoscopic length scales, which makes it a sensitive probe for the amount of local order. Here we present a method to measure the energy dependence of the high frequency mobility by combining an electrochemically gated transistor with in-situ quasi-optical measurements in the sub-terahertz domain. We apply this method to poly([2-methoxy-5-(3',7'-dimethylocyloxy)]-p-phenylene vinylene) (OC_1C_10-PPV) and find a mobility at least as high as 0.1 cm^2V^-1s^-1.