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Freestanding perovskite oxide monolayers as two-dimensional semiconductors
Xiang-Bo Xiao1,2, Bang-Gui Liu1,2
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
Nanotechnology
|December 17, 2020
Summary
Researchers identified three stable two-dimensional (2D) monolayer perovskite oxides: SrTiO3, LaAlO3, and KTaO3. These 2D materials exhibit wide-gap semiconducting properties and large dipoles, suitable for electronic and optoelectronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Two-dimensional (2D) materials offer unique electronic and optical properties for advanced device applications.
- Perovskite oxides are known for their diverse functionalities, but their 2D monolayer forms are underexplored.
- Discovering novel 2D materials is crucial for expanding the frontiers of materials science and nanotechnology.
Purpose of the Study:
- To investigate the stability and properties of tetragonal perovskite oxide monolayers as potential 2D materials.
- To identify specific perovskite oxide compositions that can form stable freestanding 2D monolayers.
- To explore the electronic and optical characteristics of these novel 2D materials for device applications.
Main Methods:
- Utilizing first-principles calculations to simulate and analyze the structural and electronic properties of potential 2D materials.
- Investigating the stability of freestanding monolayers derived from ABO3 perovskite oxides.
- Calculating and comparing the electronic band structures and optical properties of the identified monolayers.
Main Results:
- Three stable freestanding 2D monolayer materials were identified from common perovskite oxides: SrTiO3 (STO-ML), LaAlO3 (LAO-ML), and KTaO3 (KTO-ML).
- These oxide monolayers, composed of AO and BO2 atomic layers, exhibit wide-gap semiconducting behavior.
- A significant out-of-plane dipole was observed in each monolayer due to a large electrostatic potential difference across the layers.
- Optical properties were analyzed and compared with established 2D materials like graphene and MoS2.
Conclusions:
- SrTiO3, LaAlO3, and KTaO3 can be synthesized as stable 2D monolayers with promising semiconducting properties.
- The inherent large dipole moments in these 2D perovskite oxides suggest potential for novel electronic and optoelectronic functionalities.
- These findings introduce a new class of 2D materials for the development of next-generation electronic and optoelectronic devices, leveraging perovskite oxide heterostructure phenomena.
