Coupling behaviors of graphene/SiO2/Si structure with external electric field

Abstract

A traveling electric field in surface acoustic wave was introduced into the graphene/SiO2/Si sample in the temperature range of 15 K to 300 K. The coupling behaviors between the sample and the electric field were analyzed using two parameters, the intensity attenuation and time delay of the traveling-wave. The attenuation originates from Joule heat of the moving carriers, and the delay of the traveling-wave was due to electrical resistances of the fixed charge and the moving carriers with low mobility in the sample. The attenuation of the external electric field was observed in both Si crystal and graphene films in the temperature range. A large attenuation around 190 K, which depends on the strength of external electric field, was confirmed for the Si crystal. But, no significant temperature and field dependences of the attenuation in the graphene films were detected. On the other hand, the delay of the traveling-wave due to ionic scattering at low temperature side was observed in the Si crystal, but cannot be detected in the films of the mono-, bi- and penta-layer graphene with high conductivities. Also, it was indicated in this study that skin depth of the graphene film was less than thickness of two graphene atomic layers in the temperature range.

Possible pair-graphene structures govern the thermodynamic properties of arbitrarily stacked few-layer graphene

“…Also, because of its high carrier mobility, the screening length of graphene is reported to be comparable to the thickness of a single graphene layer 50 , 54 . Therefore, once a single graphene layer is transferred to the LiNbO 3 substrate, the electronic and electrical influences of the substrate can be nearly blocked.…”

Superior Visible Photoelectric Response with Au/Cu2NiSnS4 Core–Shell Nanocrystals

“…Both the expected peak position and intensity ratio confirmed that the transferred graphene layer at the top of SiO 2 /p+-Si is a monolayer graphene. 41,42 Next, we examined the absorption of both CNTS and Au/CNTS hybrid NCs to reveal the enhanced absorption efficiency by introducing Au NPs using the plasmonic effect. The corresponding UV− visible spectra are shown in Figure 3a.…”

Direct Graphene Synthesis on Lithium Niobate Substrate by Carbon Ion Implantation

“…The application of graphene must be based on the graphene/ substrate structure, and a lot of research has been conducted in recent years, but these studies are mainly focused on graphene/ Si(SiO 2 ) structure (Yoon et al, 2009;Garaj et al, 2010;Baraton et al, 2011b;Wang et al, 2011;Kumari et al, 2014;Lee et al, 2014;Dong et al, 2016;Onishi et al, 2017;Zuppella et al, 2017;Faggio et al, 2019;Ma et al, 2020). Few studies have focused on graphene/optical crystal, but among those that have , the combination of graphene and Lithium Niobate (LiNbO 3 , LN) is one of the most promising structures for development.…”