Fundamental Studies on Confinement Effects in Ionic Conduction and Inversion Layers in 2-D Single Crystal Free Standing Oxide Membranes

Abstract

New experimental techniques need to be developed to investigate the physical properties of suspended oxide membranes approaching twodimensionality. Here, we report on our progress to demonstrate a robust lithographic patterning method to fabricate self-supported ultra-thin oxides that undergo sharp structural transitions. Utilizing such self-supported membranes, we have directly observed shift in metal-insulator transition temperature arising from stress relaxation and consistent opening of the hysteresis in a model system vanadium dioxide. Electric double layer transistors are then fabricated with the membranes and compared to thin film devices. The ionic liquid allowed reversible modulation of channel resistance and allowed distinguishing bulk process from the surface effects. The techniques developed here can be widley adapted to studies of new materials in 2D suspended form.

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Document Details

Document Type
Technical Report
Publication Date
Feb 14, 2014
Accession Number
ADA603644

Entities

People

  • Shriram Ramanathan

Organizations

  • Harvard University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Chemical Vapor Deposition
  • Electrical Properties
  • Fabrication
  • Films
  • Geometry
  • Ionic Liquids
  • Materials
  • Measurement
  • Metal-Insulator Transitions
  • Microelectromechanical Systems
  • Phase Transformations
  • Physical Properties
  • Single Crystals
  • Students
  • Thin Films
  • Transition Temperature
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Thin Film Deposition Science.
  • Underwater engineering and Marine Technology.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene