Charge transport in nanoscale vertical organic semiconductor pillar devices

TL;DR

This paper investigates charge transport in nanoscale vertical organic semiconductor pillars with ultrathin P3HT layers, demonstrating high current densities and effective hole injection, paving the way for high-frequency organic transistors.

Contribution

It introduces a novel method for fabricating reproducible nanoscale organic junctions with ultrathin layers and characterizes their charge transport properties.

Findings

Achieved high current densities up to 10^6 A/m^2 in nanoscale junctions.

Demonstrated excellent hole injection in ultrathin P3HT layers.

Established potential for high-frequency, high-current organic transistors.

Abstract

We report charge transport measurements in nanoscale vertical pillar structures incorporating ultrathin layers of the organic semiconductor poly(3-hexylthiophene)(P3HT). P3HT layers with thickness down to 5 nm are gently top-contacted using wedging transfer, yielding highly reproducible, robust nanoscale junctions carrying high current densities (up to $10^6$ A/m$^2$). Current-voltage data modeling demonstrates excellent hole injection. This work opens up the pathway towards nanoscale, ultrashort-channel organic transistors for high-frequency and high-current-density operation.