Acousto-electric measurements at 2.5 GHz on graphene transferred onto YX128°-LiNbO3

Mario Costanza; Léa La Spina; Arthur De Sousa Lopes Moreira; Djaffar Belharet; Ausrine Bartasyte; Samuel Margueron

doi:10.1088/1361-6528/acd063

Acousto-electric measurements at 2.5 GHz on graphene transferred onto YX128°-LiNbO₃

Nanotechnology. 2023 May 26;34(32). doi: 10.1088/1361-6528/acd063.

Authors

Mario Costanza¹, Léa La Spina¹, Arthur De Sousa Lopes Moreira¹, Djaffar Belharet¹, Ausrine Bartasyte^{1

2}, Samuel Margueron¹

Affiliations

¹ FEMTO-ST Institute, University of Franche-Comté, ENSMM, CNRS UMR6174, Besancon, F-25030, France.
² Institut Universitaire de France (IUF), France.

PMID: 37100048
DOI: 10.1088/1361-6528/acd063

Abstract

Surface acoustic wave delay lines with an operational frequency of 2.5 GHz have been designed to measure the acousto-electric transport of carriers in graphene transferred onto YX128°-LiNbO₃piezoelectric substrate. The monolayer of graphene on LiNbO₃presented sheet resistance in the range of 733-1230 Ω/□ and ohmic contact resistance with gold of 1880 to 5200 Ωμm. The measurements with different interaction lengths on graphene bars have allowed the extraction of carrier absorption and mobility parameters from acousto-electric current. Graphene presented higher acousto-electronic interaction in the GHz range than previously reported values in the range of 100s MHz with carrier absorption losses of 109 m^-1and mobility for acoustically generated charges of 101 cm²V^-1s^-1.

Keywords: acousto-electronics; graphene; lithium niobate; phononic; radio frequency.