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All-nano-TiO2 Compact Film for High Performance Dye-Sensitized Solar Cells
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Kassio P S Zanoni , Ronaldo C Amaral , and Neyde Yukie Murakami Iha ACS Appl. Mater. Interfaces, Just Accepted Manuscript DOI: 10.1021/am501955f Publication Date (Web): June 4, 2014 Copyright © 2014 American Chemical Society Abstract
An innovative all-nano-TiO2 thin-film capable of enhancing DSC photoefficiencies was prepared by layer-by-layer (LbL) beneath the meso-TiO2 film, employing acid and basic nano-TiO2 sols as cations and anions, respectively. TiO¬2 syntheses were performed under absolute control to lead to appropriate morphological and optical properties to yield high quality compact films using profilometry, tunning and scanning electron microscopy. A detailed study by photoelectrochemical parameters, IPCE, electron lifetime and electrochemical impedance spectroscopy demonstrates that the physical contact between FTO and electrolyte is prevented and the role of the compact film has been elucidated. DSCs with TiO2 bilayers on top of FTO improved the conversion efficiency up to 58%, mainly due to the prevention of FTO/I3- charge recombination and an improved contact between FTO and TiO2. |