Piezo-response in two-dimensional α-Tellurene films
| Autor: | Lucas M. Sassi, Boris I. Yakobson, Anand B. Puthirath, Farnaz Safi Samghabadi, Long Chang, Pulickel M. Ajayan, Amey Apte, Dmitri Litvinov, Summayya Kouser |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Piezoelectric coefficient Electrostriction Condensed matter physics Mechanical Engineering Resonance 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Ferroelectricity Piezoelectricity 0104 chemical sciences Electronegativity Mechanics of Materials General Materials Science 0210 nano-technology Layer (electronics) Perovskite (structure) |
| Zdroj: | Materials Today. 44:40-47 |
| ISSN: | 1369-7021 |
| Popis: | Monoelemental two-dimensional (2D) materials have attracted significant attention due to their exciting electro-mechanical properties and extreme thinness. However, most of these materials have stable centro-symmetric structures due to same electronegativities of all atoms and lack interesting properties such as piezoelectricity and ferroelectricity. Here we report the existence of piezoelectricity in atomically thin monoelemental α-Tellurium films. DFT calculations reveal that monoelemental few layer α-Tellurene is electrostrictive. However, group theory analysis shows that α-Tellurene belongs to piezoelectric C2 group due to negligible asymmetry and has high anomalous Born effective charges, similar to the traditional perovskite piezoelectric structures. Experimental exploration demonstrates the existence of through thickness piezoelectricity. With single and dual AC resonance tracking piezoelectric force microscopy, piezoelectric coefficient (d33) up to 1 pm/V is observed for the Te ultrathin films. Moderate layer dependent piezoelectricity observed in α-Te films makes it a promising candidate for the realization of atomically thin piezoelectric devices. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect