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I-V behavior of the solar cells was investigated upon exposure
o white light. Fig. 7a and b shows the photovoltaic response of the
devices of ITO/ZnO/P3HT/PEDOTSS/Ag and TIO/ZnO/P3HT-ZnO/
PEDOTSS/Ag, respectively. ZnO content in the P3HT/ZnO
omposite is 50 wt%. The high ZnO nanoparticles concentration can
efficiently quench the PL intensity. The photovoltaic response based
on P3HT/ZnO composites is greatly enhanced. Although the ZnO
an absorb the light in the wavelength in the ranges from 300to 550 nm, Isc can be improved significantly to reach 6.5 mA/cm2
The enhancement of photovoltaic response can be explained in the
following way. ZnO nanoparticles with nanometer diameters are
well dispersed in the P3HT phase. The P3HT:ZnO nanocomposites
infiltrated into the order pores of ZnO film. The increase in inter-
faces between electron donor (P3HT) and electron acceptor (ZnO)
enhance the excitation separation. This cause enhanced the
photocurrent of the device. The effect can be more significant with
increase in ZnO nanoparticles in the P3HT/ZnO nanocomposites.
The performance of photovoltaic can be optimized through
adjustment of ZnO nanoparticles in the polymer phase.

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