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Engineering Metastability in Atomic Layer Deposition: Polymorph and Valence Control.

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This summary is machine-generated.

This review explores engineering metastable phases using Atomic Layer Deposition (ALD). It details strategies for controlling polymorphs and valence states, enabling advanced materials beyond thermodynamic limits.

Keywords:
atomic layer depositionmetastable phasepolymorphismvalence control

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Metastable phases offer unique functionalities for electronics, catalysis, and energy applications.
  • Synthesis of metastable phases is challenging due to high energy barriers and thermodynamic constraints.
  • Atomic Layer Deposition (ALD) provides precise control but has a low thermal budget, hindering metastable phase synthesis.

Purpose of the Study:

  • To review recent advances in engineering metastability using ALD.
  • To categorize and discuss strategies for achieving metastable phases via ALD.
  • To provide insights and design principles for synthesizing metastable materials.

Main Methods:

  • Categorization of metastability engineering into polymorphic transformations and valence state control.
  • Discussion of strategies for polymorph stabilization: temperature modulation, substrate matching, grain refinement, doping, and solid solutions.
  • Explanation of valence control approaches: temperature modulation, precursor/reactant selection, and post-deposition treatments.

Main Results:

  • ALD can be engineered to synthesize metastable phases by controlling polymorphs and valence states.
  • Various strategies enable selective phase stabilization and valence control within the ALD process.
  • Linking reaction mechanisms to material phases provides a pathway for achieving desired metastable states.

Conclusions:

  • ALD offers a viable route for engineering metastable materials, overcoming traditional limitations.
  • The review provides practical design principles for achieving metastable phases via ALD.
  • These advancements facilitate the development of novel functional materials for next-generation devices and technologies.