Ambipolar charge injection and transport in a single pentacene monolayer island

TL;DR

This study investigates how electrons and holes are injected and distributed in single pentacene monolayer islands, revealing the effects of crystallinity on carrier delocalization and localization at the nanoscale.

Contribution

It provides new insights into the nanoscale electronic properties of organic monolayers, highlighting the impact of structural order on charge carrier behavior.

Findings

Crystalline islands show delocalized carriers across the entire island.

Disordered islands exhibit localized carriers at injection points.

Carrier distribution depends on the monolayer's structural order.

Abstract

Electrons and holes are locally injected in a single pentacene monolayer island. The two-dimensional distribution and concentration of the injected carriers are measured by electrical force microscopy. In crystalline monolayer islands, both carriers are delocalized over the whole island. On disordered monolayer, carriers stay localized at their injection point. These results provide insight into the electronic properties, at the nanometer scale, of organic monolayers governing performances of organic transistors and molecular devices.