Laser Processing of 2D Nanosheet based Materials for Organic Electronics
E. Stratakis
1,2
1
Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology Hellas
(FORTH), N. Plastira 100, 70013, , Heraklion, Greece
Vassilika Vouton, 70013, Heraklion, Crete, Greece
2
Materials Science and Technology Department, University of Crete, 71003 Heraklion, Greece
This presentation will review our recent progress on the pulsed laser processing of graphene
oxide (GO) nanosheets and other 2D-based transparent layers for organic photovoltaic (OPV)
applications. Rapid and facile methodologies for the photochemical reduction,
functionalization and doping of GO, based on pulsed laser irradiation of GO nanosheets in
liquid or gas media, will be presented and discussed. In particular, we show the first GO
reduction technique, compatible with temperature sensitive substrates, leading to the
fabrication of large area flexible transparent reduced GO micromesh electrodes. Furthermore,
we present a simple photochemical method for the simultaneous reduction and doping of GO
and transition metal dichalcogenide nanometre layers. Using this technique Cl and N doping
was rapidly carried out at room temperature in only few minutes. By changing the exposure
time it is possible to tune the doping and reduction level and therefore the Work Function of
the nanolayers. The application of laser fabricated materials in all the three major components
of OPV devices, i.e. in transparent electrodes, photoactive layer and interfacial (buffer) layers
is demonstrated and discussed.
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