Proceedings of the European Summer School of Photovoltaics 4 – 7 ...

a)
b)
Fig. 4. ITME image: a) graphene nanoplatelets agglomeration,
b) screen printing GNP-C layers on PET film
Mechanical properties of elastic graphene films
Investigation proved that graphene layers have the same mechanical
resistance as carbon nanotubes layers. After nearly 75 000
cycles, the paths resistance of paste based on GNPs changed
+/- 2% and the resistance of the paste paths based on carbon nanotubes,
after initial improvement after the first 2000 cycles, consistently
declined slightly, although value was higher than starting
one. High mechanical resistance makes them suitable to use in
elastic fotovoltaic applications. Resistance of ITO based samples
investigated in the same way changes after very first cycles. Further
bending quickly leads to destruction of the layer.
Summary
GNPs based layers prepared with screen printing technology proved
to have good mechanical resistance and high transparency.
GNPs agglomerates were observed in investigated samples and
they are the cause of the layer’s resistance raise. Further investigation
needs to be done to observe how such situation can be
avoided.
First experiments on carbon nanotubes layers showed that
using dispersants prevents agglomerating. Without agglomerates
appearing in the samples, conductivity improves consistently.
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