Graphene group Introduction What do we manage (technology)? What do we manage in cooperation (technology)? What are our scientific topics? Some interesting examples

Our technology 3 mm

Technology in cooperation

Our scientific topics

Examples: CVD growth Scheme of home-built CVD oven Graphene growth process

Examples: CVD growth Transfer on SiO2 (300 nm)/Si Best result: average diameter of Cu grain and corresponding graphene monocrystal = 10 mm Procházka et al. - Nanotechnology 25, 18, (2014)

Examples: KPFM in ambient Charging (RH = 5 %; t = 5 minutes ) Discharging and charge transfer (RH = 30 % )

Examples: Suspended graphene

Examples: Sensors Sensors designs Response on RH 2 point 4 point Resistance response on RH change (20 -> 70 %) graphene sensitivity GO 30 % CVD graphene 2 % Exfoliated graphene < 1 %

Examples: Transport meas. Pumping and annealing Atmosphere exposition Temperature influence Magnetic field at low temp.

Examples: Solar cells Based on Schottky junction (difference between electron work function) between CVD graphene and silicon. Achieved efficiency at our faculty is around η = 0.8 %. Sample I-V curve SEM EBIC

Examples: Deposition Ga and GaN on graphene Effusion cell Ga Low energy ion source (N2+, E = 50 eV) UHV conditions RT- 400 oC The XPS spectrum of a graphene’s valence band. On CVD monocrystal of graphene On exfoliated multilayer graphene Raman spectra of the graphene sheets after the deposition of Ga. The intensity is significantly enhanced. Deposition of 12 ML of Ga at 300°C

Ideas for cooperation?