English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Piezoelectric and ferroelectric properties in the two dimensional (2D) limitare highly desired for nanoelectronic, electromechanical, and optoelectronicapplications. Here we report the first experimental evidence of out-of-planepiezoelectricity and ferroelectricity in van der Waals layered${\alpha}$-In2Se3 nano-flakes. The non-centrosymmetric R3m symmetry of the${\alpha}$-In2Se3 samples is confirmed by scanning transmission electronmicroscopy, second-harmonic generation, and Raman spectroscopy measurements.Domains with opposite polarizations are visualized by piezo-response forcemicroscopy. Single-point poling experiments suggest that the polarization ispotentially switchable for ${\alpha}$-In2Se3 nano-flakes with thicknesses downto ~ 10 nm. The piezotronic effect is demonstrated in two-terminal devices,where the Schottky barrier can be modulated by the strain-inducedpiezopotential. Our work on polar ${\alpha}$-In2Se3, one of the model 2Dpiezoelectrics and ferroelectrics with simple crystal structures, shows itsgreat potential in electronic and photonic applications.

Out-of-plane Piezoelectricity and Ferroelectricity in Layered ${\alpha}$-In2Se3 Nano-flakes