title: AFM diagnostics of graphene-based quantum Hall devices.
abstract: In this paper we present the results of morphological, mechanical and electrical investigation of the properties of prepared graphene flakes and graphene-based quantum Hall devices. AFM imaging allowed us to identify the local imperfections and unintentional modifications of the graphene sheets which had caused severe deterioration of the device electrical performance. Utilizing the NanoSwing imaging method, based on the time-resolved tapping mode, we could observe non-homogeneities of the structural and mechanical properties. We also diagnosed the device under working conditions by Kelvin probe microscopy and detected its local electric field distribution.
authors.affiliation: Electrotechnical Institute, Division of Electrotechnology and Materials Science, M. Skłodowskiej-Curie 55/61, 50-369 Wrocław, Poland. sikora@iel.wroc.pl
authors.forename: Andrzej
authors.initials: A
authors.lastname: Sikora
authors.forename: Mirosław
authors.initials: M
authors.lastname: Woszczyna
authors.forename: Miriam
authors.initials: M
authors.lastname: Friedemann
authors.forename: Franz Josef
authors.initials: FJ
authors.lastname: Ahlers
authors.forename: Martin
authors.initials: M
authors.lastname: Kalbac