title: Centimeter Scale Patterned Growth of Vertically Stacked Few Layer Only 2D MoS2/WS2 van der Waals Heterostructure.
abstract: Two-dimensional (2D) van der Waal (vdW) heterostructures composed of vertically-stacked multiple transition metal dichalcogenides (TMDs) such as molybdenum disulfide (MoS2) and tungsten disulfide (WS2) are envisioned to present unprecedented materials properties unobtainable from any other material systems. Conventional fabrications of these hybrid materials have relied on the low-yield manual exfoliation and stacking of individual 2D TMD layers, which remain impractical for scaled-up applications. Attempts to chemically synthesize these materials have been recently pursued, which are presently limited to randomly and scarcely grown 2D layers with uncontrolled layer numbers on very small areas. Here, we report the chemical vapor deposition (CVD) growth of large-area (>2 cm(2)) patterned 2D vdW heterostructures composed of few layer, vertically-stacked MoS2 and WS2. Detailed structural characterizations by Raman spectroscopy and high-resolution/scanning transmission electron microscopy (HRTEM/STEM) directly evidence the structural integrity of two distinct 2D TMD layers with atomically sharp vdW heterointerfaces. Electrical transport measurements of these materials reveal diode-like behavior with clear current rectification, further confirming the formation of high-quality heterointerfaces. The intrinsic scalability and controllability of the CVD method presented in this study opens up a wide range of opportunities for emerging applications based on the unconventional functionalities of these uniquely structured materials.
authors.affiliation: Nanoscience Technology Center, University of Central Florida, Orlando, Florida 32826, United States.
authors.forename: Nitin
authors.initials: N
authors.lastname: Choudhary
authors.affiliation: Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76207, United States.
authors.forename: Juhong
authors.initials: J
authors.lastname: Park
authors.affiliation: Carbon Convergence Materials Research Center, Korea Institute of Science and Technology, Jeonbuk, 565-905, South Korea.
authors.forename: Jun Yeon
authors.initials: JY
authors.lastname: Hwang
authors.affiliation: Jeonju Center, Korea Basic Science Institute, Jeonju, Jeollabuk-do, 54907, South Korea.
authors.forename: Hee-Suk
authors.initials: HS
authors.lastname: Chung
authors.affiliation: Nanoscience Technology Center, University of Central Florida, Orlando, Florida 32826, United States.
authors.forename: Kenneth H
authors.initials: KH
authors.lastname: Dumas
authors.affiliation: Nanoscience Technology Center, University of Central Florida, Orlando, Florida 32826, United States.|Department of Physics, University of Central Florida, Orlando, Florida 32826, United States.
authors.forename: Saiful I
authors.initials: SI
authors.lastname: Khondaker
authors.affiliation: Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76207, United States.
authors.forename: Wonbong
authors.initials: W
authors.lastname: Choi
authors.affiliation: Nanoscience Technology Center, University of Central Florida, Orlando, Florida 32826, United States.|Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida 32816, United States.
authors.forename: Yeonwoong
authors.initials: Y
authors.lastname: Jung