resumo
Low-dimensional ferroelectrics, ferrielectrics, and antiferroelectrics are of urgent scientific interest due to their unusual polar, piezoelectric, electrocaloric, and pyroelectric properties. The strain engineering and strain control of the ferroelectric properties of layered two-dimensional van der Waals materials, such as CuInP2(S,Se)(6) monolayers, thin films, and nanoflakes, are of fundamental interest and especially promising for their advanced applications in nanoscale nonvolatile memories, energy conversion and storage, nano-coolers, and sensors. Here, we study the polar, piezoelectric, electrocaloric, and pyroelectric properties of thin strained films of a ferrielectric CuInP2S6 covered by semiconducting electrodes and reveal an unusually strong effect of a mismatch strain on these properties. In particular, the sign of the mismatch strain and its magnitude determine the complicated behavior of piezoelectric, electrocaloric, and pyroelectric responses. The strain effect on these properties is opposite, i.e., "anomalous," in comparison with many other ferroelectric films, for which the out-of-plane remanent polarization, piezoelectric, electrocaloric, and pyroelectric responses increase strongly for tensile strains and decrease or vanish for compressive strains.
categoria
Science & Technology - Other Topics; Materials Science; Physics
autores
Morozovska, AN; Eliseev, EA; Yurchenko, LP; Laguta, VV; Liu, YT; Kalinin, SV; Kholkin, AL; Vysochanskii, YM
nossos autores
Andrei Kholkin
Investigador Principalagradecimentos
A.N.M. and A.L.K. acknowledge support from the Horizon Europe Framework Program (HORIZON-TMA-MSCA-SE), Project No. 101131229, Piezoelectricity in 2D-materials: materials, modeling, and applications (PIEZO 2D). A.N.M. also acknowledges funding from the National Academy of Sciences of Ukraine (Grant N 4.8/23-Pi "Innovative materials and systems with magnetic and/or electrodipole ordering for the needs of using spintronics and nanoelectronics in strategically important issues of new technology"). A.N.M., E.A.E., and L.P.Y. acknowledge support from the National Academy of Sciences of Ukraine. The research was partly supported by the Czech Science Foundation under Project No. 23-05578S (V.L.). S.V.K. was supported by the Center for 3D Ferroelectric Microelectronics (3DFeM), an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, under Award No. DE-SC0021118. This work (A.L.K.) was developed within the scope of project CICECO-Aveiro Institute of Materials (Nos. UIDB/50011/2020 and UIDP/50011/2020), financed by national funds through the FCT-Foundation for Science and Technology (Portugal).