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Controllable Photovoltaic Effect of Microarray Derived from Epitaxial Tetragonal BiFeO3 Films.

Zengxing Lu1, Peilian Li2, Jian-Guo Wan1

  • 1Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.

ACS Applied Materials & Interfaces
|July 27, 2017
PubMed
Summary

Researchers manipulated the ferroelectric photovoltaic effect in BiFeO3 films by controlling polarization. This breakthrough enables controllable photovoltaic processes for advanced microelectronic devices.

Keywords:
conductive atomic force microscopedepolarization fieldferroelectric photovoltaic effectheterostructuremicroarraytetragonal BiFeO3 film

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • The ferroelectric photovoltaic (FePV) effect is crucial for optoelectronic devices.
  • Controllable photovoltaic processes in ferroelectric materials are essential for practical applications.

Purpose of the Study:

  • To prepare well-ordered microarrays of epitaxially tetragonal BiFeO3 (T-BFO) films.
  • To achieve controllable manipulation of the photovoltaic process in T-BFO films.

Main Methods:

  • Pulsed laser deposition technique for T-BFO film preparation.
  • Conductive atomic force microscopy (CAFM) for observing polarization-dependent photocurrent.
  • Band structure analysis to understand the underlying mechanism.

Main Results:

  • Successfully prepared well-ordered T-BFO microarrays.
  • Directly observed polarization-dependent photocurrent under UV illumination.
  • Demonstrated manipulation of the photovoltaic process by controlling ferroelectric polarization and buffer layers.

Conclusions:

  • The photovoltaic process manipulation is attributed to the interplay between interface band alignment and depolarization fields.
  • This work deepens the understanding of FePV effects in BiFeO3 devices at the microscale.
  • Provides a pathway for developing novel data storage and logic switching microdevices.