Techniques of synthesizing mono-layer Molybdenum Sulfide (MoS 2 ) Wu Kam Lam.

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Presentation transcript:

Techniques of synthesizing mono-layer Molybdenum Sulfide (MoS 2 ) Wu Kam Lam

What is Molybdenum Sulfide? A member of transition metal dichalcogenide (TMD) Layered structure similar to graphite. Normally appear in bulk form. Indirect band gap of 1.2eV S Mo Bulk MoS 2 Atomic structure

Attractiveness of Mono-layer MoS 2 2-Dimensional (2D) material with 0.8nm thickness Direct band gap of 1.8eV (no band gap in graphene) Application on electronics and photonic devices Consume 100,000 times less energy than silicon transistor in off state. Synthesis of wafer scale mono-layer MoS 2 is still challenging. Mono-layer MoS 2 Schematic of MoS 2 FET

Synthesis Techniques Top – down approach Mechanical Exfoliation Chemical intercalation Bottom – up approach Chemical Vapor deposition

Mechanical Exfoliation

Optical image SEM imageAFM image

Chemical intercalation LiPF 6 electrolyte

Suspension of layered MoS 2 in solvent Thin film from vacuum filtration of suspension Suspension of layered MoS 2 in water

Chemical Vapor deposition Gas Exhaust Gas Inlet(Ar) Quartz tube Furnace MoO3 S

Raman Characterization Raman shift: 19cm -1

Question?