Physical Properties of (Na1- xK x)NbO3 Thin Film Grown at Low Temperature Using Two-Dimensional Ca2Nb3O10 Nanosheet Seed Layer

Sang Hyo Kweon, Jong Hyun Kim, Mir Im, Woong Hee Lee, Sahn Nahm

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    A monolayer Ca2Nb3O10 (CNO) nanosheet was deposited on a Pt/Ti/SiO2/Si substrate using the Langmuir-Blodgett method. This monolayer CNO nanosheet with a (001) surface termination was used as a seed layer to reduce the growth temperature of the crystalline (Na1-xKx)NbO3 (NKN) film. The crystalline NKN film was preferentially grown along the [001] direction at 400 °C. The ferroelectric and piezoelectric properties of this NKN film were influenced by the postannealing atmosphere due to the variations in the amounts of oxygen vacancies in the NKN film. The crystalline NKN film annealed at 300 °C under 50 Torr O2 atmosphere showed promising ferroelectric and piezoelectric properties; ϵr of 303 and tan δ of 2.0% at 100 kHz, Ps of 15.3 μC/cm2, Pr of 11.7 μC/cm2, and Ec of 78 kV/cm, and d33 of 139 pm/V. This NKN film showed the lowest leakage current, which can be explained by the Schottky emission mechanism. The Schottky barrier heights of the Pt/NKN and NKN/CNO/Pt interfaces were calculated to be 0.97 and 0.28 eV, respectively. The results of this work suggest a new method to grow crystalline thin films at low temperatures by using metal-oxide nanosheets as the seed layer.

    Original languageEnglish
    Pages (from-to)25536-25546
    Number of pages11
    JournalACS Applied Materials and Interfaces
    Volume10
    Issue number30
    DOIs
    Publication statusPublished - 2018 Aug 1

    Bibliographical note

    Funding Information:
    This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2017R1A2B4007189). Moreover, the authors also thank the KU-KIST graduate school program of Korea University.

    Publisher Copyright:
    © Copyright 2018 American Chemical Society.

    Keywords

    • lead-free
    • low-temperature deposition
    • nanosheet
    • piezoelectric thin film
    • preferred orientation
    • seed layer

    ASJC Scopus subject areas

    • General Materials Science

    Fingerprint

    Dive into the research topics of 'Physical Properties of (Na1- xK x)NbO3 Thin Film Grown at Low Temperature Using Two-Dimensional Ca2Nb3O10 Nanosheet Seed Layer'. Together they form a unique fingerprint.

    Cite this