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Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition
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Perovskite thin films via atomic layer deposition.

Brandon R Sutherland1, Sjoerd Hoogland, Michael M Adachi

  • 1Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada.

Advanced Materials (Deerfield Beach, Fla.)
|November 1, 2014
PubMed
Summary

Researchers developed a new method for depositing perovskite thin films using atomic layer deposition (ALD). This technique offers precise thickness control and promising optical properties for advanced material applications.

Keywords:
atomic layer depositionoptical gainperovskitestransient absorption

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Perovskite thin films are crucial for optoelectronic devices.
  • Controlling film thickness and conformality is challenging with traditional methods.
  • Atomic Layer Deposition (ALD) offers precise control over thin film growth.

Purpose of the Study:

  • To develop a novel method for depositing high-quality perovskite thin films.
  • To leverage ALD for enhanced thickness control and conformality.
  • To investigate the optical properties of the resulting perovskite films.

Main Methods:

  • A seed layer of atomic layer deposition (ALD) lead sulfide (PbS) was deposited.
  • Place-exchange reactions were used to convert the PbS seed layer to lead iodide (PbI2).
  • The PbI2 layer was further converted to methylammonium lead iodide (CH3NH3PbI3) perovskite.

Main Results:

  • The method successfully produced perovskite thin films with controlled thickness and conformality.
  • The resulting films exhibited promising optical properties.
  • Measured gain coefficients were as high as 3200 ± 830 cm(-1).

Conclusions:

  • The novel ALD-based method enables precise fabrication of perovskite thin films.
  • These films possess excellent optical characteristics suitable for optoelectronic applications.
  • This approach advances the development of high-performance perovskite-based devices.