Publications by authors named "Hiroto Ogura"
In-plane heterostructures of transition metal dichalcogenides (TMDCs) have attracted much attention for high-performance electronic and optoelectronic devices. To date, mainly monolayer-based in-plane heterostructures have been prepared by chemical vapor deposition (CVD), and their optical and electrical properties have been investigated. However, the low dielectric properties of monolayers prevent the generation of high concentrations of thermally excited carriers from doped impurities.
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- * Traditional methods to adjust bandgap, such as gating and strain, have limited effectiveness, typically allowing changes of about 0.1 eV, while alloying TMDCs offers a more effective solution with variable bandgap properties.
- * The researchers created a color-tunable light-emitting device using a WS/WSe alloy, which allows for a variable light-emission energy range and enables continuous color tuning by adjusting the recombination zone, paving the way for broader optical applications.
To maximize the potential of transition-metal dichalcogenides (TMDCs) in device applications, the development of a sophisticated technique for stable and highly efficient carrier doping is critical. Here, we report the efficient n-type doping of monolayer MoS2 using KOH/benzo-18-crown-6, resulting in a doped TMDC that is air-stable. MoS2 field-effect transistors show an increase in on-current of three orders of magnitude and degenerate the n-type behaviour with high air-stability for ∼1 month as the dopant concentration increases.
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