Supplementary information for: Deterministic assembly of arrays of lithographically defined WS_2 and MoS_2 monolayer features directly from multilayer sources into van der Waals heterostructures

Taylor, Hayden1 ; Nguyen, Vu1; Gramling, Hannah1; Towle, Clarissa1; Li, Wan1; Lien, Der-Hsien1; Kim, Hyungjin1; Chrzan, Daryl1; Javey, Ali1; Xu, Ke1; Ager, Joel1

Published Oct 24, 2019 on Dryad. https://doi.org/10.6078/D16T1S

Cite this dataset

Taylor, Hayden et al. (2019). Supplementary information for: Deterministic assembly of arrays of lithographically defined WS_2 and MoS_2 monolayer features directly from multilayer sources into van der Waals heterostructures [Dataset]. Dryad. https://doi.org/10.6078/D16T1S

Abstract

One of the major challenges in the van der Waals (vdW) integration of 2D materials is achieving high-yield and high-throughput assembly of pre-defined sequences of monolayers into heterostructure arrays. Mechanical exfoliation has recently been studied as a promising technique to transfer monolayers from a multilayer source synthesized by other techniques, allowing the deposition of a wide variety of 2D materials without exposing the target substrate to harsh synthesis conditions. Although a variety of processes have been developed to exfoliate the 2D materials mechanically from the source and place them deterministically onto a target substrate, they can typically transfer only either a wafer-scale blanket or one small flake at a time with uncontrolled size and shape. Here we present a method to assemble arrays of lithographically defined monolayer WS₂ and MoS₂ features from multilayer sources and directly transfer them in a deterministic manner onto target substrates. This exfoliate–align–release process—without the need of an intermediate carrier substrate—is enabled by combining a patterned, gold-mediated exfoliation technique with a new optically transparent, heat-releasable adhesive. WS₂/MoS₂ vdW heterostructure arrays produced by this method show the expected interlayer exciton between the monolayers. Light-emitting devices using WS₂ monolayers were also demonstrated, proving the functionality of the fabricated materials. Our work demonstrates a significant step towards developing mechanical exfoliation as a scalable dry transfer technique for the manufacturing of functional, atomically thin materials.