2D Materials Lab
Custom made annealing oven: Vacuum chamber with a 5-inch hotplate. Turbo-pump: Turbo HiPace 300 Package, P min: 10-8 Torr; Tmax 800ºC, gases: N2, Forming gas, Ar
The annealing oven is used for the annealing of microfabrication residuals for materials that cannot be exposed to air or oxygen at high temperatures, such a graphene and other 2D materials. The annealing oven is also used for some curing steps of special resigns and to improve the metal adhesion to specific substrates and increase the coupling at the metal/material interface.
Confocal Raman microscope Witec for ultrafast 3D Raman imaging. The system is equipped with two excitation wavelengths, 488 and 632 nm, and two diffraction gratings, 600 and 1800 g/nm. Several magnification objectives are available, including a 50x long working distance and a 63x immersion.
Home-built, vertical, hot-wall MOCVD reactor system
Thin film synthesis by use of volatile precursors that are stored in external stainless steel canisters and released through stainless steel tubing into heatable reaction chamber (vertical quartz tube). Currently used for deposition of mono-to few layer MoS2 from (CH3CH2)2S and Mo(CO)6 precursors . Ar/H2 as carrier/reducing gas, mass flow controllers, max. temperature: ca. 900ºC in quartz tube hot-wall reaction zone, T control by thermocouple at sample, controllable reaction pressure down to base pressure: 5*10-4 torr provided by rotary pump. Inlet and outlet gas filters, exhaust safety system.
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