Piezoelectricity across 2D Phase Boundaries

Anand B. Puthirath, Xiang Zhang, Aravind Krishnamoorthy, Rui Xu, Farnaz Safi Samghabadi, David C. Moore, Jiawei Lai, Tianyi Zhang, David E. Sanchez, Fu Zhang, Nicholas R. Glavin, Dmitri Litvinov, Robert Vajtai, Venkataraman Swaminathan, Mauricio Terrones, Hanyu Zhu, Priya Vashishta, Pulickel M. Ajayan

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Piezoelectricity in low-dimensional materials and metal–semiconductor junctions has attracted recent attention. Herein, a 2D in-plane metal–semiconductor junction made of multilayer 2H and 1T′ phases of molybdenum(IV) telluride (MoTe2) is investigated. Strong piezoelectric response is observed using piezoresponse force microscopy at the 2H–1T′ junction, despite that the multilayers of each individual phase are weakly piezoelectric. The experimental results and density functional theory calculations suggest that the amplified piezoelectric response observed at the junction is due to the charge transfer across the semiconducting and metallic junctions resulting in the formation of dipoles and excess charge density, allowing the engineering of piezoelectric response in atomically thin materials.

Original languageEnglish (US)
Article number2206425
JournalAdvanced Materials
Volume34
Issue number39
DOIs
StatePublished - Sep 28 2022

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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