Emerging Materials and Design Principles for Wurtzite-Type Ferroelectrics

Cheng-Wei Lee, Naseem Ud Din, Keisuke Yazawa, Geoff Brennecka, Andriy Zakutayev, Prashun Gorai

Research output: Contribution to journalArticlepeer-review

1 Scopus Citations

Abstract

Low-energy compute-in-memory architectures promise to reduce the energy demand for computation and data storage. Wurtzite-type ferroelectrics are promising options for both performance and integration with existing semiconductor processes. The Al1-xScxN alloy is among the few tetrahedral materials that exhibit polarization switching, but the electric field required to switch the polarization is too high (few MV/cm). Going beyond binary compounds, we explore the search space of multinary wurtzite-type compounds. Through this large-scale search, we identify four promising ternary nitrides and oxides, including Mg2PN3, MgSiN2, Li2SiO3, and Li2GeO3, for future experimental realization and engineering. In 90% of the considered multinary materials, we identify unique switching pathways and non-polar structures that are distinct from the commonly assumed switching mechanism in AlN-based materials. Our results disprove the existing design principle based on the reduction of the wurtzite c/a lattice parameter ratio when comparing different chemistries while supporting two emerging design principles - ionicity and bond strength.
Original languageAmerican English
Pages (from-to)1644-1659
Number of pages16
JournalMatter
Volume7
Issue number4
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5K00-86883

Keywords

  • ferroelectrics
  • low-energy computing
  • materials discovery
  • polarization switching
  • wurtzite-type ferroelectrics

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