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Fabrication and characterization of atomically thin layers
Tesař, Jan ; Kunc, Jan (oponent) ; Procházka, Pavel (vedoucí práce)
This work is focused on the area of two-dimensional materials, their preparation, and analysis. Probably the most known representative of two-dimensional materials is the graphene. This 2D carbon allotrope, sometimes called the "father of 2D materials", offers an intriguing combination of electrical, thermal, and mechanical properties. Graphene received a lot of attention and has been prepared by many approaches. Still, one preparation method stands superior in the meaning of graphene quality. Mechanical exfoliation is very simple in comparison to other techniques that still produces graphene of the highest quality. The thesis is also focused on the optimization of the process producing heterostructures based upon graphene and hBN layers. The established process yielded multiple van der Waals heterostructures, which were analyzed by Raman spectroscopy, atomic force microscopy, and low electron energy microscopy. The charge carrier mobility measurements were also accomplished at the GFET setup. Obtained values of mobility demonstrated excelling transport properties of the exfoliated graphene over the graphene prepared by other methods. Thus proving the described creation process as suitable for the preparation of quality heterostructures.
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Fabrication and characterization of atomically thin layers
Tesař, Jan ; Kunc, Jan (oponent) ; Procházka, Pavel (vedoucí práce)
This work is focused on the area of two-dimensional materials, their preparation, and analysis. Probably the most known representative of two-dimensional materials is the graphene. This 2D carbon allotrope, sometimes called the "father of 2D materials", offers an intriguing combination of electrical, thermal, and mechanical properties. Graphene received a lot of attention and has been prepared by many approaches. Still, one preparation method stands superior in the meaning of graphene quality. Mechanical exfoliation is very simple in comparison to other techniques that still produces graphene of the highest quality. The thesis is also focused on the optimization of the process producing heterostructures based upon graphene and hBN layers. The established process yielded multiple van der Waals heterostructures, which were analyzed by Raman spectroscopy, atomic force microscopy, and low electron energy microscopy. The charge carrier mobility measurements were also accomplished at the GFET setup. Obtained values of mobility demonstrated excelling transport properties of the exfoliated graphene over the graphene prepared by other methods. Thus proving the described creation process as suitable for the preparation of quality heterostructures.
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