title: Vertical heterostructure of two-dimensional MoS₂ and WSe₂ with vertically aligned layers.
abstract: Two-dimensional (2D) layered materials consist of covalently bonded 2D atomic layers stacked by van der Waals interactions. Such anisotropic bonding nature gives rise to the orientation-dependent functionalities of the 2D layered materials. Different from most studies of 2D materials with their atomic layers parallel to substrate, we have recently developed layer vertically aligned 2D material nanofilms. Built on these developments, here, we demonstrate the synthesis of vertical heterostructure of n-type MoS2 and p-type WSe2 with vertically aligned atomic layers. Thin film of MoS2/WSe2 vertical structure was successfully synthesized without significant alloy formation. The heterostructure synthesis is scalable to a large area over 1 cm(2). We demonstrated the pn junction diode behavior of the heterostructure device. This novel device geometry opens up exciting opportunities for a variety of electronic and optoelectronic devices, complementary to the recent interesting vertical heterostructures with horizontal atomic layers.
authors.affiliation: Department of Materials Science and Engineering, ‡Department of Electrical Engineering, and §Department of Applied Physics, Stanford University , Stanford, California 94305, United States.
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Yu
authors.forename: Hye Ryoung
authors.initials: HR
authors.lastname: Lee
authors.forename: Seung Sae
authors.initials: SS
authors.lastname: Hong
authors.forename: Desheng
authors.initials: D
authors.lastname: Kong
authors.forename: Hyun-Wook
authors.initials: HW
authors.lastname: Lee
authors.forename: Haotian
authors.initials: H
authors.lastname: Wang
authors.forename: Feng
authors.initials: F
authors.lastname: Xiong
authors.forename: Shuang
authors.initials: S
authors.lastname: Wang
authors.forename: Yi
authors.initials: Y
authors.lastname: Cui
keywords: Two-dimensional layered material; heterostructure; molybdenum disulfide; transition metal dichalcogenide; tungsten diselenide; vertically aligned layer