title: Designed Synthesis of van der Waals Heterostructures: The Power of Kinetic Control.
abstract: Selecting specific 2D building blocks and specific layering sequences of van der Waals heterostructures should allow the formation of new materials with designed properties for specific applications. Unfortunately, the synthetic ability to prepare such structures at will, especially in a manner that can be manufactured, does not exist. Herein, we report the targeted synthesis of new metal-semiconductor heterostructures using the modulated elemental-reactant technique to nucleate specific 2D building blocks, control their thickness, and avoid epitaxial structures with long-range order. The building blocks, VSe2 and GeSe2 , have different crystal structures, which inhibits cation intermixing. The precise control of this approach enabled us to synthesize heterostructures containing GeSe2 monolayers alternating with VSe2 structural units with specific sequences. The transport properties systematically change with nanoarchitecture and a charge-density wave-like transition is observed.
authors.affiliation: Department of Chemistry, University of Oregon, Eugene, OR 97403 (USA). matti@uoregon.edu.
authors.forename: Matti B
authors.initials: MB
authors.lastname: Alemayehu
authors.affiliation: Department of Chemistry, University of Oregon, Eugene, OR 97403 (USA).
authors.forename: Matthias
authors.initials: M
authors.lastname: Falmbigl
authors.affiliation: Department of Chemistry, University of Oregon, Eugene, OR 97403 (USA).
authors.forename: Kim
authors.initials: K
authors.lastname: Ta
authors.affiliation: Department of Chemistry, University of Oregon, Eugene, OR 97403 (USA).
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Ditto
authors.affiliation: Sandia National Laboratories, 7011 East Avenue, MS 9161, Livermore, CA 94551 (USA).
authors.forename: Douglas L
authors.initials: DL
authors.lastname: Medlin
authors.affiliation: Department of Chemistry, University of Oregon, Eugene, OR 97403 (USA). davej@uoregon.edu.
authors.forename: David C
authors.initials: DC
authors.lastname: Johnson
keywords: kinetic control; layered structures; nanostructures; selenides; van der Waals heterostructures