Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D40: 2D Materials: Ferroic Behavior
3:00 PM–6:00 PM,
Monday, March 6, 2023
Room: Room 232
Sponsoring
Unit:
DMP
Chair: Yang Liu; Salvador Barraza-Lopez, University of Arkansas
Abstract: D40.00008 : Thickness-dependent vibrational and ferroelectric properties in CuInp2S6*
4:48 PM–5:00 PM
Presenter:
Rahul Rao
(Air Force Research Laboratory)
Authors:
Rahul Rao
(Air Force Research Laboratory)
Stephanie D Lough
(University of Central Florida)
Ryan Selhorst
(Air Force Research Laboratory)
Benjamin S Conner
(Air Force Research Laboratory)
Masa Ishigami
(University of Central Florida)
Michael A Susner
(Air Force Research Lab - WPAFB)
Layered two-dimensional CuInP2S6 (CIPS) is a room-temperature ferroelectric material that is promising for a variety of electronics applications. While some previous studies have demonstrated the persistence of ferroelectricity down to few-layer thick flakes, others have reported a critical thickness below which ferroelectricity disappears or is severely diminished. These differences have been attributed to decreasing domain sizes, screening effects and even to a possible thickness-dependent structural phase transition. To uncover the origins of these discrepancies, we conducted a detailed thickness-dependent study on mechanically exfoliated flakes (ranging from 10 - 450 nm thick). We will present Raman spectral data collected at room temperature and across the ferroelectric phase transition temperature (TC ~315 K in bulk CIPS), probing structural changes (through variations in peak frequencies and widths) with dimensionality as well as TC. These data are complemented by piezoresponse force microscopy (PFM) measurements to reveal the effect of flake thickness on the ferroelectric domain sizes.
*AFOSR
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