Perfecting the Growth and Transfer of Large Single-Crystal CVD Graphene: A Platform Material for Optoelectronic Applications

TL;DR

This paper reports on the synthesis of large single-crystal graphene via CVD, its transfer methods, and validation of its high electronic quality, positioning it as a promising material for optoelectronic applications.

Contribution

It introduces a scalable method to produce high-quality single-crystal graphene and demonstrates its electronic properties are comparable to exfoliated graphene.

Findings

Successful synthesis of millimeter-sized single-crystal graphene.

High crystal quality confirmed by microscopy and Raman spectroscopy.

Electronic properties comparable to mechanically exfoliated graphene.

Abstract

In this work we demonstrate the synthesis of millimetre-sized single-crystals of graphene, achievable in a commercially-available cold-wall CVD reactor, and several different approaches to transfer it from the growth substrate to a target substrate of choice. We confirm the high crystal quality of this material using various characterisation techniques, including optical and scanning electron microscopy as well as Raman spectroscopy. By performing field effect and quantum Hall effect measurements we demonstrate that the electronic properties of such single-crystals are comparable to those of ideal mechanically exfoliated flakes of graphene. Several applications of this high-quality material are also reviewed.