Synthesis and characterisation of TiO_2 nanoparticle with polypyridily complexes for using in solar cells

摘要

In the present work, at first, the metal complexes [Os~(II) (phen)_2 (phen-dione)](PF_6)_2.2H_2O, [Os~(II) (phen)(bpy) (phen-dione)](PF_6)_2.2H_2O and [Os~(II) (bpy)_2(phen-dione)](PF_6)_2.2H_2O, (phen = 1,10-phenanthroline, bpy = 2,2' bipyridil and phen-dione = 1,10-phenanthroline-5,6-dione) have been synthesised as photo sensitizers for TiO_2 semiconductor solar cells. Then, we have synthesised the TiO_2 nanoparticle with ascorbic acid as the reducing agent. The particle size of TiO_2 nanoparticle has been obtained about 20 nm. The optimum reaction conditions and the product obtained have been reported. At last, the reactivity and coordination between prepared TiO_2 thin film and complexes have been studied. It was found that coordination between phen-dione complexes and TiO_2 increases the intensity of electronic absorption. The surface topography and grain size of TiO_2 nanoparticle and thin films were characterised and analysed with atomic force microscopy (AFM). Also, the products have been characterised by IR and UV-Vis spectroscopy. The structures of products were characterised by XRD. The reaction details and features were described and discussed.