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

2. Our technology
3 mm

3. Technology in cooperation

4. Our scientific topics

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

6. 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)

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

8. Examples: Suspended graphene

9. 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 %

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

11. 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

12. 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

13. Ideas for cooperation?