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Operando Electron Microscopy of Nanoscale Electronic Devices on Nonconductive Substrates
Menglin Zhu1, Michael Xu1, Zishen Tian2,3
1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Summary
This study introduces a new method for studying thin film capacitors using electron microscopy. The technique allows for realistic device testing, preserving atomic-scale behavior under electric fields.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Electron Microscopy
Background:
- Operando electron microscopy for thin film devices is challenging on nonconductive substrates.
- Conventional sample preparation methods alter native device properties like strain and boundary conditions.
Purpose of the Study:
- To develop a versatile workflow for operando biasing of thin-film capacitors in electron microscopy.
- To enable realistic device testing without modifying the original film structure.
Main Methods:
- A novel sample preparation technique using a patterned insulating barrier.
- Operando biasing of thin-film capacitors within a (scanning) transmission electron microscope.
- Case study on piezoelectric thin-film capacitors on insulating substrates.
Main Results:
- The method allows for operando biasing without altering the original film structure.
- Boundary-condition-sensitive domain switching was preserved at the atomic scale.
- Demonstrated the workflow's applicability to piezoelectric thin films.
Conclusions:
- The presented workflow provides a generic and versatile approach for operando studies.
- Enables systematic investigation of thin-film systems under representative bulk testing geometries.
- Facilitates understanding of device response under realistic operating conditions.
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