Volume 13, Issue 26 1700452
Communication

Preservation of Surface Conductivity and Dielectric Loss Tangent in Large-Scale, Encapsulated Epitaxial Graphene Measured by Noncontact Microwave Cavity Perturbations

Albert F. Rigosi

Corresponding Author

Albert F. Rigosi

National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899 USA

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Nicholas R. Glavin

Nicholas R. Glavin

Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, OH, 45433 USA

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Chieh-I Liu

Chieh-I Liu

National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899 USA

Graduate Institute of Applied Physics, National Taiwan University, Taipei, 10617 Taiwan

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Yanfei Yang

Yanfei Yang

National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899 USA

Joint Quantum Institute, University of Maryland, College Park, MD, 20742 USA

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Jan Obrzut

Jan Obrzut

National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899 USA

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Heather M. Hill

Heather M. Hill

National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899 USA

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Jiuning Hu

Jiuning Hu

National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899 USA

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Hsin-Yen Lee

Hsin-Yen Lee

National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899 USA

Theiss Research, La Jolla, CA, 92037 USA

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Angela R. Hight Walker

Angela R. Hight Walker

National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899 USA

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Curt A. Richter

Curt A. Richter

National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899 USA

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Randolph E. Elmquist

Randolph E. Elmquist

National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899 USA

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David B. Newell

David B. Newell

National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899 USA

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First published: 19 May 2017
Citations: 27

Abstract

Regarding the improvement of current quantized Hall resistance (QHR) standards, one promising avenue is the growth of homogeneous monolayer epitaxial graphene (EG). A clean and simple process is used to produce large, precise areas of EG. Properties like the surface conductivity and dielectric loss tangent remain unstable when EG is exposed to air due to doping from molecular adsorption. Experimental results are reported on the extraction of the surface conductivity and dielectric loss tangent from data taken with a noncontact resonance microwave cavity, assembled with an air-filled, standard R100 rectangular waveguide configuration. By using amorphous boron nitride (a-BN) as an encapsulation layer, stability of EG's electrical properties under ambient laboratory conditions is greatly improved. Moreover, samples are exposed to a variety of environmental and chemical conditions. Both thicknesses of a-BN encapsulation are sufficient to preserve surface conductivity and dielectric loss tangent to within 10% of its previously measured value, a result which has essential importance in the mass production of millimeter-scale graphene devices demonstrating electrical stability.

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