Piezoelectric effect in 2H and 3R phases of α-In2Se3

Author:

Ueda Keisuke,Murata Ryoga,Sasagawa Takao,Shiomi Yuki

Abstract

Abstract α-In2Se3 is a two-dimensional (2D) ferroelectric semiconductor at RT. Here we study piezoelectric d 33 coefficients in 2H and 3R phases of α-In2Se3 single crystals at RT. Dynamic displacement signals measured with a laser Doppler vibrometer increase linearly with applied electric fields, consistent with the inverse piezoelectric effect. The estimated d 33 coefficients are about 50 pm V−1 in the 2H phase and about 10 pm V−1 in the 3R phase. These d 33 values in α-In2Se3 are large among 2D piezoelectric materials reported before. The slightly larger d 33 value in the 2H phase could be attributed to the stacking structure with in-plane rotation, which allows the 2D layers to move more easily in the perpendicular direction.

Funder

Japan Society for the Promotion of Science

Japan Science and Technology Agency

Publisher

IOP Publishing

Subject

General Physics and Astronomy,General Engineering

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