TiO₂/P3HT Hybrid Solar Cell with Efficient Interface Modification by Organic and Inorganic Materials: A Comparative Study.

TiO₂/P3HT hybrid solar cells were fabricated by infiltrating P3HT into the pores of TiO₂ nanowire arrays. CdS quantum dot and pyridine were employed to modify the interface of TiO₂/P3HT before P3HT was coated. The results show that the interface treatment significantly enhanced the photovoltaic performance of the cell. However characterization of time-resolved photoluminescence, open-circuit voltage decay and transmission electron microscope analysis revealed that the underlying mechanism was different for the organic and inorganic interface modifications. Pyridine plays an important role in assisting the charge separation at the TiO₂/P3HT interface, and suppressing electron back recombination. The reason for CdS modifying the cell in this way is mainly due to the suppression of electron back recombination, and the additional photovoltaic effect generated by CdS itself.