Cetyltriammonium Bromide Assisted Synthesis of Lanthanum Containing Barium Stannate Nanoparticles for Application in Dye Sensitized Solar Cells

摘要

In present work, correlation of structural and optical behavior of pristinernand lanthanum containing barium stannate nanoparticles (synthesized viarncetyltriammonium bromide (CTAB) assisted facile wet chemical route), andrnits effect on photovoltaic properties of dye-sensitized solar cell arernreported. Thermo-gravimetric analysis of the dried compound presumablyrnBaSn(OH)_6, leads to the formation of BaSnO_3 nanoparticles through threernendothermic decomposition processes, via liberation of one mole of waterrnin each step, together with removal of remaining CTAB in initial cycle. ThernX-ray diffraction patterns reveal that substitution of Ba~(2+) lattice sites byrnLa~(3+) (upto ≈6 at.%), the lattice retains its cubic Pm3m symmetry,rnhowever, unit cell contracts. The dye sensitized solar cells are fabricatedrnusing pristine and La- containing BaSnO3 as photo anode; platinumrncoated FTO as counter electrode, N719 dye as sensitizer and I~-/I_3~- asrnelectrolyte. These show the highest power conversion efficiency (≈9.2%)rnat the La content of 6 at.% which is about threefold increase in efficiencyrnin comparison to pristine BaSnO_3. The electron transport properties ofrnthese DSSC devices are investigated by electro chemical impedancernspectroscopy.