Abstract
Abstract A novel rapid and continuous process has been designed to synthesize near surface nitrogen doped TiO 2 (NSND-TiO 2 ) using a modified flame spray pyrolysis (FSP) equipment. NSND-TiO 2 was obtained by simply introducing a spray of ammonia water above the flame in which TiO 2 nanoparticles were just formed. The introduction of N elements into TiO 2 nanocrystalline results in a reducing of energy band gap to 2.90 eV and a strong enhance of visible light absorption. The generation structure of O–Ti–N in NSND-TiO 2 can suppress the charge recombination at the TiO 2 /dye/electrolyte interface. These properties can improve the short-circuit current ( J sc ) and open-circuit voltage ( V oc ) of dye sensitized solar cells (DSCs), and the DSCs of NSND-TiO 2 electrode exhibits a power conversion efficiency of 6.03%, much higher than that of undoped TiO 2 . This work provides a high yield and promising method to prepare NSND-TiO 2 nanoparticles with improved DSCs performance.
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