Preparation And Properties Of Rare Earth Doped SrSnO₃

Environmental and energy issues are the focus of world attention,solar energy is inexhaustible,more and more researchers have pay attention to develop solar energy.Simplepreparation,environmentally friendly,non-pollution,lower production costs,etc.,are the characters of dye-sensitized solar cell?Dye-sensitized solar cells,DSSC?,which become much more excellentthanother batteries.In DSSC,the electrons generated in the dye,and the complete separation of electrons is achieved in a semiconductor.N3 and N719 are commonly used as the dyeof DSSC,the absorption spectrum of these two dyesmainly locates in the visible region,and they reveal light absorption in ultraviolet light.Rare earth is known for their conversion function.In order to further expand the response range of the spectrum,we use the down conversion rare earth,which convert ultraviolet light to visible light to improve the utilization of the sunlight.In this paper,SrSnO₃ as matrix material,we synthesizedthe Sm³⁺ doped SrSnO₃ luminescent powder,whichpossessed the down-conversion function.Then SrSnO₃:Sm³⁺is directlyused as a photo-anode,or SrSnO₃:Sm³⁺ blended with TiO₂ to form the SrSnO₃:Sm³⁺/TiO₂ composite photoanode to investigate their photoelectricity properties.?1?Sm was successfully doped into SrSnO₃ matrix via hydrothermal method,then the SrSnO₃:Sm³⁺nanoparticles were characterized by XRD,EDS,TGA-DSC.It demonstrated that doped a little amount of Sm did not change the crystal structure of SrSnO₃.The precursor Sr Sn?OH?6was annealed to form the SrSnO₃ by the loss of crystal water.Fluorescence analysis showed that,SrSnO₃:Sm³⁺was excited by the 412 nm near ultraviolet,then emittedthe visible light in the range from 550 to 650 nm.In order to study the impact of the amount of rare-earth on photoelectric properties,the SrSnO₃:Sm³⁺ was served as the photo anode directly to assemble the DSSC.When the doping amount is 0.6%,the open circuit voltage of cellachieved 0.67 V,the short circuit current density of the cell was 4.11 m A/cm² and the fill factor reached 0.56.Meanwhile,the efficiency was 1.54%,which improved by 41%compared with the undoped SrSnO₃.?2?We made the nano SrSnO₃: Sm³⁺ powders by hydrothermal method.By changing the stirring time we prepared nano powders,which was a mixture with different morphologies,such as large particles,stout prismatic and stick.The size of the grain was in 40 55 nm.The down conversion nanoparticles of SrSnO₃:Sm³⁺ mixed with TiO₂ powder acted as photoanode.Thenwe investigated the effect of the dosage of SrSnO₃:Sm³⁺on optoelectronic properties of SrSnO₃:Sm³⁺/TiO₂ composite photoanode.It turned out that,the emission peak of SrSnO₃:Sm³⁺down conversion powder was at 587 nm.And when the doping amount of SrSnO₃:Sm³⁺ was 3%,the efficiency and the short-circuit current density of the SrSnO₃:Sm³⁺/TiO₂ photovoltaic cell came to maxima,open circuit voltage attained 0.72 V,the short circuit currentdensity was 10.3m A/cm²,the efficiency of photoelectric conversionwas 4.09% and theefficiencyofmonochromaticlight achieved to 42.1%.