Towards Low-Temperature CVD Synthesis and Characterization of Mono- or Few-Layer Molybdenum Disulfide.

Molybdenum disulfide (MoS) transistors are a promising alternative for the semiconductor industry due to their large on/off current ratio (>10), immunity to short-channel effects, and unique switching characteristics. MoS has drawn considerable interest due to its intriguing electrical, optical, sensing, and catalytic properties. Monolayer MoS is a semiconducting material with a direct band gap of ~1.

Bandgap recovery of monolayer MoS using defect engineering and chemical doping.

Two-dimensional transition metal dichalcogenide materials have created avenues for exciting physics with unique electronic and photonic applications. Among these materials, molybdenum disulfide is the most known due to extensive research in understanding its electronic and optical properties. In this paper, we report on the successful growth and modification of monolayer MoS (1L MoS) by controlling carrier concentration and manipulating bandgap in order to improve the efficiency of light emission.

Multidimensional Imaging Reveals Mechanisms Controlling Multimodal Label-Free Biosensing in Vertical 2DM-Heterostructures.

Two-dimensional materials and their van der Waals heterostructures enable a large range of applications, including label-free biosensing. Lattice mismatch and work function difference in the heterostructure material result in strain and charge transfer, often varying at a nanometer scale, that influence device performance. In this work, a multidimensional optical imaging technique is developed in order to map subdiffractional distributions for doping and strain and understand the role of those for modulation of the electronic properties of the material.

Quantification of defects engineered in single layer MoS.

Atomic defects are controllably introduced in suspended single layer molybdenum disulfide (1L MoS) using helium ion beam. Vacancies exhibit one missing atom of molybdenum and a few atoms of sulfur. Quantification was done using a Scanning Transmission Electron Microscope (STEM) with an annular detector.