Dielectrophoretic Assembly of High-Density Arrays of Individual Graphene Devices for Rapid Screening

TL;DR

This paper demonstrates a dielectrophoretic method for assembling high-density arrays of individual graphene devices, enabling rapid screening and characterization of their electrical properties.

Contribution

The study introduces a scalable dielectrophoretic assembly technique for creating high-density graphene device arrays with controlled single-flake deposition.

Findings

Devices are electrically active and characterized successfully.

The assembly process is self-limiting to one flake per device.

Method enables rapid screening of large device arrays.

Abstract

We establish the use of dielectrophoresis for the directed parallel assembly of individual flakes and nanoribbons of few-layer graphene into electronic devices. This is a bottom-up approach where source and drain electrodes are prefabricated and the flakes are deposited from a solution using an alternating electric field applied between the electrodes. These devices are characterized by scanning electron microscopy, atomic force microscopy, Raman spectroscopy and electron transport measurements. They are shown to be electrically active and their current carrying capacity and subsequent failure mechanism is revealed. Akin to carbon nanotubes, we show that the dielectrophoretic deposition is self-limiting to one flake per device and is scalable to ultra-large-scale integration densities, thereby enabling the rapid screening of a large number of devices.