Research On Photoelectronic Properties Of Ga/In Sulfide Synthesized By Solventhermal/Hydrothermal Treatment

Nowadays, the energy crisis is threatening the development of the world economy,therefore the solar cell is a potential method expected to solve this problem.Semiconductor nanomaterials that are the major raw materials of solar cell, such as III-V,II-VI, III-VI semiconductors，are widely studied. Semiconductor nanomaterials arecommonly considered to be one of the most promising subjects. In this experiment,Ga2S3and In2S3powders with different shapes were successfully synthesized bysolvent-thermal and hydro-thermal synthesis respectively. The experiments offabricating Ga2S3and In2S3explores how reaction conditions including solvent, ratioamount of raw material, concentration of raw material, templet reagent and reactiontempreture influence the morphology of Ga2S3and In2S3powders. Phase composition ofGa2S3and In2S3powders was analyzed by X-ray diffraction (XRD); surface topographyof Ga2S3and In2S3powders were observed by scanning and transmission electronmicroscopy (SEM&TEM); Photoluminescence properties of Ga2S3powders wereanalyzed by photoluminescence spectra (PL); optical absorption properties of In2S3powders were characterized by UV-visible absorption spectra; photoelectrol propertiesof Ga2S3and In2S3powders were characterized by surface photovoltage spectrecopy(SPS). As-prepared Ga2S3and In2S3powders were used to be fabricated DSSCs, andphotoelectricity conversion efficiency of these solar cells was characterized by J-Vmeasurement to study their photoelectrol property further.Synthesis of Ga2S3powders by solventhermal treatment is successfully obtainedincluding four one dimension (1D) powders, three two dimension (2D) powders, fourthree dimension (3D) Ga2S3powders, indexing to JCPDS No.43-0916. The result showsthat1D Ga2S3powders are pure, and the emitting photoluminescence wavelenghth ofthem is blue-shift with decreasing of material diameter affected on size theme, thereforethe width of SPS shape is red-shift.2D Ga2S3powders are also pure, and the emittingphotoluminescence wavelenghth of them is blue-shift with decreasing of materialdiameter affected on size theme, therefore the width of SPS shape is bigger. Theemitting photoluminescence wavelenghth of3D Ga2S3powders have wide scope, andthe width of SPS shape of flower-like3D Ga2S3powders with decreasing of materialdiameter is red-shift.The result of experiments indicates that the appropriate reaction conditions are thatreaction tempreture is maintained at165℃for two days. In this paper, we obtain solidand hollow spheres In2S3powders. According to UV, TG, SPS, Eg of In2S3powders is about1.9eV, and is stable below480℃. The signal of surface photovoltage is strongebetween300and700nm, achieving15~20mV.Moreover, this experiment assembled Ga2S3and In2S3powders into dye-sensitizedsolar cells and optimized photic anode preparation technique by dropwise method andcomposite method. The results of experiment that Ga2S3powders were used for DSSCsshows that the ptotoelectrol conversion efficiency is2D>1D>3D. And the highestconversion efficiency is5.5%, which is higher22%than blank battery (4.5%). Thesequence of conversion efficiency of DSSCs dipping In2S3powders is solid spheres>blank> hollow spheres. When the ratio of In2S3powders with P25is1:4, the DSSCscompounded solid and hollow In2S3powders have the highest conversion efficiencywith5.8%and6.6%, respectly.