Can I read Interface-tuning of ferroelectricity and quadruple-well state in CuInP$ 2$S$ 6$ via ferroelectric oxide on EtoBox?

Interface-tuning of ferroelectricity and quadruple-well state in CuInP$ 2$S$ 6$ via ferroelectric oxide by Wang, Kun; Li, Du; Wang, Jia; Hao, Yifei; Anderson, Hailey; Yang, Li; Hong, Xia is a scholarly article available to read on EtoBox.

What is Interface-tuning of ferroelectricity and quadruple-well state in CuInP$ 2$S$ 6$ via ferroelectric oxide about?

Ferroelectric van der Waals CuInP$_2$S$_6$ possesses intriguing quadruple-well states and negative piezoelectricity. Its technological implementation has been impeded by the relatively low Curie temperature (bulk $T_C$ ~42 {\deg}C) and the lack of precise domain control. Here we show that CuInP$_2$S$_6$ can be immune to the finite size effect and exhibits enhanced ferroelectricity, piezoelectricity, and polar alignment in the ultrathin limit when interfaced with ferroelectric oxide PbZr$_{0.2}$Ti$_{0.8}$O$_3$ films. Piezoresponse force microscopy studies reveal that the polar domains in thin CuInP$_2$S$_6$ fully conform to those of underlying PbZr$_{0.2}$Ti$_{0.8}$O$_3$, where the piezoelectric coefficient changes sign and increases sharply with reducing thickness. High temperature $in$ $situ$ domain imaging points to a significantly enhanced $T_C$ exceeding 200 {\deg}C for 13 nm CuInP$_2$S$_6$ on PbZr$_{0.2}$Ti$_{0.8}$O$_3$. Density functional theory modeling and Monte Carlo simulations show that the enhanced polar alignment and $T_C$ can be attributed to interface-mediated structure distortion in CuInP$_2$S$_6$. Our study provides an effective material strategy to engineer the po

Author

Wang, Kun; Li, Du; Wang, Jia; Hao, Yifei; Anderson, Hailey; Yang, Li; Hong, Xia

Published

2023

Language

EN