Surface and Interface Engineering of van der Waals Nanoelectronic Heterostructures
Abstract
Title: Surface and Interface Engineering of van der Waals Nanoelectronic HeterostructuresObjective:This proposal will employ atomically precise fabrication and characterization methods to understand and engineer surfaces and interfaces in van der Waals nanoelec"tronic heterostructures.Approach:Of particular interest will be the elemental 2D materials phosphorene and borophene, which are t""he phosphorus and boron analogues of graphene, respectively. In both cases, methods for realizing atomically thin samples over large" areas will be pursued in addition to encapsulation and passivation schemes that will mitigate the high chemical reactivity of these" materials in ambientconditions. Subsequent work will integrate phosphorene and borophene with carbon nanomaterials (e.g., organic"" semiconductors, graphene, and graphene nanoribbons) to realize a diverse suite of van der Waals nanoelectronic heterostructures. Th""orough characterization using atomically precise imaging (e.g., scanning tunneling microscopy and spectroscopy), chemical spectrosco""py (e.g., X-ray photoelectron spectroscopy and Raman spectroscopy), and chargetransport measurements will reveal the underlying fun"damental physics and chemistry of theseheterostructures.SOW:This project consists of following two tasks:Task 1: From Black Phosphorus to PhosphoreneThis task will explore methods for controlling the thickness of black phosphorus down to the atomically thin" phosphorene limit. The first subtask will develop layer-by-layer thinning of black phosphorus using thermal annealing, plasma etchi""ng, and conductive atomic force microscopy nanopatterning, ultimately allowing the realization of thickness-modulatedphosphorene he"terostructures. The second subtask will utilize deoxygenated ethanol-water cosolventmixtures to drive exfoliation and stabilization of surfactant-free phosphorene dispersions.The third subtask will directly grow phosphorene at the interface between silicon carbi"de and epitaxial graphene, thereby yielding phosphorene/graphene heterostructures.Task 2: Borophene van der Waals Heterostructures""This task will explore borophene van der Waals heterostructures. The first subtask will develop growth conditions, encapsulation met""hods, and transfer schemes that will allow the isolation and study of high-coverage and homogeneous phases of borophene. The second" subtask will integrate borophene with organic semiconductors including self-assembled lateral andvertical borophene/organic heterostructures. The third subtask will explore methods for formingborophene heterostructures with graphene and graphene nanoribbons (GN"Rs). Specifically,borophene/graphene heterostructures will be achieved through sequential deposition of carbon and boron on noble m""etal substrates, whereas borophene/GNR heterostructures will be derived from the deposition and conversion of GNR molecular precurso""rs on borophene/metal substrates.ONR Relevance:Ultimately, this work will develop design rules for phosphorene and borophene van"" der Waals nanoelectronic heterostructures, thus impacting a range of electronic, optoelectronic, and sensing technologies with dire"ct relevance for the Navy.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 29, 2017
- Source ID
- N000141712993
Entities
People
- Mark Hersam
Organizations
- Northwestern University
- Office of Naval Research
- United States Navy