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Polymer based photovoltaic (PV) devices have been stimulating
ever increasing interest as a promising alternative for renewable
resource of energy . These devices as oppose to conventional
silicon solar cells have increasing attention because of their
potentials for the production of flexible and large areas solar cell at
a remarkable low cost. Several solar cell devices, using conjugated
organic materials, have been demonstrated in the last decade
. Particularly, over the last few years poly(3-hex-
ythiophene) (P3HT) has been used as the polymeric donor in plastic
PV research . But the polymer-based devices are still limited
in their performance because of the weak absorption in the visible
long wavelength, poor charge transport and low stability
. Recently, the improvements of performance of the
polymer based solar cells have been actively explored through
optimization of materials as well as device structures. The imple-
mentation of a bulk heterojunction of donors and acceptors semi-
conductor increases the efficiency of such solar cells in the great
extent. In recent years, various solution processed bulk-hetero-
junction PV devices have been reported using p-type conjugated
polymers either in combinationwith n-type polymers, fullerenes or
with n-type inorganic semiconductor nanoparticles.

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