Microstructure, optical and dielectric properties of cerium oxide thin films prepared by pulsed laser deposition

Abstract

Cerium oxide (CeO2) thin films were deposited on Pt (111)/Ti/SiO2/Si(100) substrates using pulsed laser deposition method at different temperatures such as, 300 K, 573 K and 873 K with 3 × 10−2 mbar oxygen partial pressure. The prepared films were systematically investigated using X-ray diffraction (XRD), atomic force microscopy (AFM), photoluminescence (PL) and electrical measurement system. XRD analysis clearly showed improved crystallinity of CeO2 films prepared at 573 and 873 K substrate temperatures. The AFM analysis indicated the uniform distribution of the nanocrystallites and dense structure with the roughness (RMS) of ~ 2.1–3.6 nm. The PL studies of the films showed a broad peak at ~ 366–368 nm, indicating the optical bandgap of 3.37–3.38 eV. The electrical property study showed minimum leakage current density of 2.0 × 10−7 A/cm2 at 873 K, which was measured at 100 kV and this value was much lower than that of the CeO2 film deposited at 300 K. The dielectric constants are increased and dielectric loss values decreased for the films with increasing substrate temperature.

Publication DOI: https://doi.org/10.1007/s10854-019-02031-3
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
Additional Information: © Springer Nature B.V. 2019. The final publication is available at Springer via http://dx.doi.org/10.1007/s10854-019-02031-3 Funding: Marie Skłodowska-Curie Individual Fellowship (MOFUS, # 795356).
Uncontrolled Keywords: Electronic, Optical and Magnetic Materials,Atomic and Molecular Physics, and Optics,Condensed Matter Physics,Electrical and Electronic Engineering
Publication ISSN: 1573-482X
Full Text Link:
Related URLs: http://link.spr ... 854-019-02031-3 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2019-09-01
Published Online Date: 2019-08-28
Accepted Date: 2019-08-13
Authors: Balakrishnan, G.
Panda, Arun Kumar
Raghavan, C. M. (ORCID Profile 0000-0003-3521-4255)
Singh, Akash
Prabhakar, M. N.
Mohandas, E.
Kuppusami, P.
Song, Jung Il

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