Pruebas estadísticas:

In summary, a systematic study of the properties of graphene-ND heterostructures has been carried out and the operation of an FET on GrHND structures demonstrated. Due to low cost, easy deposition and high thermal conductivity, monolayer ND is a good alternative support for graphene when compared SCD or UNCD for current-carrying capacitive graphene devices. The properties of graphene on NDs with and without H-termination were investigated using FTIR, Raman spectroscopy, and XPS. The C-H bond present on H- terminated NDs, strongly influences the heterostructure that results from depositing graphene on the NDs. The presence of the H-termination leads to the appearance of a so-called D peak, the shifts of the G and 2D peaks, and the ratio of sp3/sp2 carbon present. From EIS measurements performed at elevated temperatures, the hydrogen links both ND and graphene to create the charge transfer which induces a conductive interface layer between graphene and ND. The mobility of GrHND increases 60% compared with graphene on SiO2/Si and is comparable with GrHSCD (single crystal diamond). As temperature is

This means that the GrHND layers are more suitable for stable device operation over a wide temperature range. In addition, GrHND heterostructures offer higher carrier densities and lower sheet resistances than those of GrHSCD, offering higher current handling capacity. FETs fabricated on this novel type of herterostructure GrHND gave comparable output characteristics to FETs on graphene-SCD, whilst offering the prospect of low cost large area production of graphene electronics.

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Chapter 7

Graphene-Single Crystal Diamond (100)/(111)

Hybrid Structure

7.1 Introduction

Owing to the lack of a finite band gap, graphene devices can never be turned off completely, which is an obstacle on the way of the use graphene in logic and high-speed switching devices1. Creating a finite gap without degrading the graphene‘s properties remains challenging even that different approaches have reported to open up the band gap, such as graphene nanoribbons2, graphene hydrogenation3, graphene doping4, and application of strain5. Here in this chapter we systematically investigate experimental and simulative study of graphene on different orientation single crystal diamond (100) and (111) (G@SCD) to induce a band gap.