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Ferroelectric domain studies of CuInP<sub>2</sub>S<sub>6</sub> on PbZr<sub>0.2</sub>Ti<sub>0.8</sub>O<sub>3</sub>

ORAL

Abstract

Van der Waals CuInP2S6 (CIPS) exhibits ferroelectricity at room temperature. Above a critical thickness (90-100 nm), it possesses both out-of-plane and in-plane polarization. Here, we study the effect of a ferroelectric base layer on thick and few-layer CIPS using piezoresponse force microscopy (PFM). We mechanically exfoliated 10-150 nm CIPS flakes, and transferred them on top of 50 nm epitaxial (001) PbZr0.2Ti0.8O3 (PZT) films, which were deposited on 10 nm (La,Sr)MnO3-buffered SrTiO3 substrates. Using conductive atomic force microscopy, we created stable and switchable ferroelectric domains on PZT in the regions with and without CIPS, and imaged the domain structures using vertical and lateral PFM. The domains written on bare PZT show well-defined sharp domain walls (DWs). In contrast, the domains on CIPS/PZT show crooked DWs, and the switched area extends well beyond the region where the bias voltage was applied. We attribute this observation to the mobile charge carrier diffusion. Our study provides important insight into the role of mobile charges in the ferroelectric semiconductors during polarization switching.

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Presenters

  • Jia Wang

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln

Authors

  • Jia Wang

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln

  • Kun Wang

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, University of Nebraska - Lincoln

  • Dawei Li

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln

  • Yifei Hao

    University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln

  • Xia Hong

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln