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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/PEDOT SS/Ag and TIO/ZnO/P3HT-ZnO/PEDOT SS/Ag, respectively. ZnO content in the P3HT/ZnOomposite 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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