Direct CVD Synthesis of MoS₂ Monolayers on Glass by Carbothermal Reduction

Abstract

Chemical vapor deposition (CVD) synthesis for two-dimensional (2D) transition-metal dichalcogenides (TMDCs) is fundamentally important for realizing high-quality single crystals of TMDCs for future electronic and optoelectronic device applications. However, CVD synthesis of TMDCs generally requires a high synthetic temperature (>700 °C), which limits the choice of growth substrates and their broad applications. In this work, we present direct CVD synthesis of 2D MoS 2 on glass. The CVD growth temperature was significantly decreased to 500 °C by employing carbothermal reduction, which uses carbon as the catalyst for reducing the thermal decomposition temperature of MoO 3 precursors. MoS 2 single crystals grown on glass showed no observable degradation in electrical, optical, and structural properties compared to MoS 2 grown at high temperatures. The MoS 2 grown on glass exhibited field effect mobility around 7.6 cm 2 V −1 s −1 and a high ON/OFF ratio of up to 10 7 , photoresponsivity up to 40 A/W, and stable and repeatable photocurrent. These findings demonstrate a promising strategy in the CVD growth of 2D materials and the design of their flexible and transparent devices.

Achieving Adsorbate-Free Monolayered MoS2 Field Effect Transistors by Controlled Surface Gas Treatment

“…19 Furthermore, the atomic force microscopy (AFM) measurement exhibited a thickness of approximately 1 nm, which is consistent with the thickness of monolayered MoS 2 (Figure S2). 20 The H 2 O and O 2 molecules are easily adsorbed on the MoS 2 surface once it is exposed to ambient air during the device fabrication and the evaluation process. The presence of these molecules has been demonstrated to lead to the depletion of the MoS 2 resulting in a reduction of the carrier concentration.…”

Toward Ideal Low‐Frequency Noise in Monolayer CVD MoS2 FETs: Influence of van der Waals Junctions and Sulfur Vacancy Management

“…In addition, the thickness of MoS 2 was confirmed to be ≈0.7 nm through the height profile of the atomic force microscope (AFM) mapping image, as shown in Figure S2 (Supporting Information). [ 41 ] To confirm the structure of the CuS electrode, which we synthesized by using the atmospheric sulfurization method, we performed the XRD analysis (Figure S3 , Supporting Information). The XRD spectra distinctly display the covellite CuS structure (JCPDS Card No.…”

Growth of Co9S8 Islands on Cu2S Nanodisks

“…The study of pristine heterojunctions is relevant to a host of emerging optoelectronic and quantum technology applications. Solution-grown heterojunctions are of particular interest due to their potentially stronger confinement as well as their scalability and integrability with other components. − It is evident that colloidal heteroassemblies have emergent properties that can be gainfully employed toward photocatalysis, , electrocatalysis, supercapacitors, pollutant degradation, , and other applications. − Despite their obvious desirability, heteroassembly preparation is an involved task, requiring the preparation of assembly components, typically in separate reactions, followed by the application of functionalization protocols that enable the eventual docking of the subcomponents into an assembled structure. An additional issue is the lack of structural continuity in the components of an assembly, typically due to the retention of functionalizing molecules at the component interfaces.…”