Robust growth of two-dimensional metal dichalcogenides and their alloys by active chalcogen monomer supply.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35197463.
- Also identified by DOI 10.1038/s41467-022-28628-7 and PMC identifier 8866400.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The precise precursor supply is a precondition for controllable growth of two-dimensional (2D) transition metal dichalcogenides (TMDs). Although great efforts have been devoted to modulating the transition metal supply, few effective methods of chalcogen feeding control were developed. Here we report a strategy of using active chalcogen monomer supply to grow high-quality TMDs in a robust and controllable manner, e.g., MoS<sub>2</sub> monolayers perform representative photoluminescent circular helicity of ~92% and electronic mobility of ~42 cm<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup>. Meanwhile, a uniform quaternary TMD alloy with three different anions, i.e., MoS<sub>2(1-x-y)</sub>Se<sub>2x</sub>Te<sub>2y</sub>, was accomplished. Our mechanism study revealed that the active chalcogen monomers can bind and diffuse freely on a TMD surface, which enables the effective nucleation, reaction, vacancy healing and alloy formation during the growth. Our work offers a degree of freedom for the controllable synthesis of 2D compounds and their alloys, benefiting the development of high-end devices with desired 2D materials.