الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
Hydrothermal method is an energy saving method to fabricate
nanocomposites of G/CNTs. TEM images confirm the well distribution of
CNTs with graphene nano-sheets. However, a forest like morphology was
observed for higher CNTs concentrations (15 wt%). The increase in Seebeck
coefficient with increasing the concentration of CNTs is related to the
intrinsic properties of strong Sp
2
hyperdization, which enhances the thermal
heat transfer through G/CNT nanocomposites. To fabricate a complete
device, we deposited Nb doped TiO
2
on glass substrate. The surface
roughness of the deposited TiO
2
on glass substrate was investigated using
atomic force microscope (AFM) measurements. AFM images of TiO2
:Nb
films demonstrates very smooth surface and small root mean square values
which is less than 2nm.
Hydrothermal technique was used to synthesis G/CNT nanocomposites. In
addition, the template was used as a substrate for the synthesized active layer.
We modified different concentration of G/CNT nanocomposites in the
prepared active layer. Solar cells are made by assembling Au/P
3HT:PCBM
(active layer)/ Nb-doped TiO
2
/Au and Au/P
3
HT:PCBM:(G/CNT)/Nb-doped
TiO
2
/Au using convective assembly method under 100mWcm
-2
. The TiO
2
layer provides an appropriate work function to form an ideal contact with the
active layer and a smooth surface and the relevant parameters were
summarized in Table 2.2 It can be seen from Table 4.1 that the solar cell with
carbon based active layer provides higher efficiency and FF.