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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
Published on: December 4, 2014
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Single-crystal two-dimensional material epitaxy on tailored non-single-crystal substrates.
Xin Li1,2, Guilin Wu3,4, Leining Zhang5,6
1Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, P.R. China.
Nature Communications
|April 2, 2022
Summary
Single-crystal 2D materials can now be grown on twinned crystals, challenging long-held epitaxy principles. This breakthrough enables wafer-scale production of high-quality graphene and hexagonal boron nitride films.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Science
Background:
- Epitaxial growth traditionally relies on single-crystal substrates for templating overlayers.
- This principle has guided materials epitaxy for over 70 years, limiting large-scale production of certain high-quality materials.
Purpose of the Study:
- To investigate the counterintuitive possibility of growing single-crystal 2D materials on twinned crystals.
- To establish a geometric principle for aligning 2D materials on high-index surfaces, specifically across twin boundaries.
Main Methods:
- Development of a geometric principle to predict 2D material alignment on high-index surfaces.
- Synthesis of wafer-scale copper (Cu) foils with abundant twin boundaries.
- Epitaxial growth of 2D materials on these polycrystalline Cu foils.
Main Results:
- Demonstrated that 2D material islands on opposing sides of a twin boundary can be well-aligned.
- Successfully grew wafer-scale single-crystal graphene and hexagonal boron nitride films on polycrystalline Cu foils.
- Validated the geometric principle for 2D material alignment on twinned substrates.
Conclusions:
- The study challenges the traditional requirement of single-crystal substrates for epitaxial growth.
- The findings significantly increase the availability of large-area, high-quality 2D single crystals.
- This work advances the fundamental understanding of materials epitaxy and its principles.
