Thermally Induced 2D Alloy‐Heterostructure Transformation in Quaternary Alloys
Abstract
Composition and phase specific 2D transition metal dichalogenides (2D TMDs) with a controlled electronic and chemical structure are essential for future electronics. While alloying allows bandgap tunability, heterostructure formation creates atomically sharp electronic junctions. Herein, the formation of lateral heterostructures from quaternary 2D TMD alloys, by thermal annealing, is demonstrated. Phase separation is observed through photoluminescence and Raman spectroscopy, and the sharp interface of the lateral heterostructure is examined via scanning transmission electron microscopy. The composition‐dependent transformation is caused by existence of miscibility gap in the quaternary alloys. The phase diagram displaying the miscibility gap is obtained from the reciprocal solution model based on density functional theory and verified experimentally. The experiments show direct evidence of composition‐driven heterostructure formation in 2D atomic layer systems.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 10, 2018
- Source ID
- 10.1002/adma.201804218
Entities
People
- Alex Kutana
- Amey Apte
- Boris I Yakobson
- Chandra Sekhar Tiwary
- Jordan A Hachtel
- Juan Carlos Idrobo
- Jun Lou
- Pulickel Ajayan
- Robert Vajtai
- Sandhya Susarla
- Xiting Yang
- Zehua Jin
Organizations
- Air Force Office of Scientific Research
- Indian Institutes of Technology
- Oak Ridge National Laboratory
- Office of Science
- Rice University
- United States Department of Energy