Resistance hysteresis correlated with synchrotron radiation surface studies in atomic sp² layers of carbon synthesized on ferroelectric (001) lead zirconate titanate in an ultrahigh vacuum.

ABSTRACT: Carbon layers are deposited on 100 nm thick atomically clean (001) lead zirconate titanate (PZT) in ultrahigh vacuum, ruling out the presence of any contaminants. X-ray photoelectron spectroscopy is used to assess the substrate surface or interface composition, substrate polarization and the thickness of carbon layers, which ranges from less than one monolayer (1 ML) of graphene to several monolayers. Atomically clean PZT(001) exhibit inwards polarization, and this polarization reverses the sign upon carbon deposition. Cationic vacancies are detected near the PZT surface, consistent with heavy p doping of these films near the surface. The carbon layers exhibited a consistent proportion of atoms forming in-plane sp² bonds, as detected by near-edge absorption fine structure (NEXAF

SUBMITTER: Apostol NG 

PROVIDER: S-EPMC9047335 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature