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Thermally Induced 2D Alloy‐Heterostructure Transformation in Quaternary Alloys
Author(s) -
Susarla Sandhya,
Hachtel Jordan A.,
Yang Xiting,
Kutana Alex,
Apte Amey,
Jin Zehua,
Vajtai Robert,
Idrobo Juan Carlos,
Lou Jun,
Yakobson Boris I.,
Tiwary Chandra Sekhar,
Ajayan Pulickel M.
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201804218
Subject(s) - materials science , heterojunction , spinodal decomposition , photoluminescence , raman spectroscopy , band gap , phase diagram , annealing (glass) , scanning transmission electron microscopy , miscibility , condensed matter physics , phase (matter) , optoelectronics , nanotechnology , transmission electron microscopy , composite material , optics , organic chemistry , chemistry , physics , polymer
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.