Abstract
The mechanisms of photoinduced charge transfer in composites ofTiO2 nanorods with a conjugatedpolymer (poly(2-methoxy-5-(2′-ethyl)(hexyloxy) 1,4-phenylenevinylene) (MEH-PPV) have been investigated bysteady-state, time-resolved photoluminescence (PL) spectroscopy and photoluminescenceexcitation (PLE) spectroscopy. Efficient charge separation takes place at theTiO2-nanorod/polymer interfaces when the polymer is excited, leading to quenching of the photoluminescence efficiencyη and shortening ofthe measured lifetime τPL. In addition, the low-temperature absorption and photoluminescence spectra show that the inclusionof TiO2 nanorods in polymer can reduce disorder in conformation and enhanceconjugation in the polymer chain. A photovoltaic solar cell device based on theMEH-PPV/TiO2-nanorod composite material is also presented, which shows a two order increase in short-circuit currentJSC compared to that based on the pristine MEH-PPV.
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