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Enhanced Photoconductivity at Dislocations in SrTiO3.

Maximilian Kissel1,2, Lukas Porz2,3, Till Frömling2

  • 1Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.

Advanced Materials (Deerfield Beach, Fla.)
|June 21, 2022
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Dislocations in strontium titanate oxide semiconductors significantly boost photoconductivity. Their specific arrangement impacts the global photoresponse, opening new avenues for photoelectric device engineering.

Keywords:
conductive atomic force microscopedislocationsmicroelectrodesoxide ceramic single crystalsphotoconductivityphotovoltaic effect

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Semiconductor Physics

Background:

  • Crystallographic line defects, known as dislocations, are typically detrimental to semiconductor properties.
  • However, their role in oxide semiconductors remains less understood, particularly concerning electronic and photoelectric functionalities.

Purpose of the Study:

  • To investigate the impact of controlled dislocations on the photoconductivity of strontium titanate single crystals.
  • To explore the potential of dislocations in tailoring photoelectric properties of oxide semiconductors.

Main Methods:

  • Controlled plastic deformation of strontium titanate single crystals to introduce ordered dislocations.
  • Nanoscale conductive atomic force microscopy to probe local photoconductivity around dislocation cores.
  • Macroscopic in-plane measurements to assess global photoresponse.

Main Results:

  • Dislocations were controllably introduced in strontium titanate via two slip systems with distinct mesoscopic arrangements.
  • Significant enhancement of photoconductivity was observed around dislocation cores at the nanoscale.
  • Different mesoscopic arrangements of dislocations led to orders of magnitude variation in global photoconductivity.
  • Evidence for a bulk photovoltaic effect associated with dislocation strain fields was observed.

Conclusions:

  • Dislocations in oxide semiconductors, specifically strontium titanate, can enhance photoconductivity, contrary to their effect in traditional semiconductors.
  • The arrangement of dislocations critically influences the macroscopic photoresponse, offering a method for tuning photoelectric properties.
  • Dislocations represent a promising research direction for developing novel photoelectric functionalities in oxide materials.