Preparation And Properties Of Sb₂S₃ Based Solar Cells Based On ZnO Nanostructures

With the energy crisis and environmental pollution becoming increasingly serious,solar cells have attracted much attention for many researchers.Sb2S3 based solar cells have good application prospects due to their low cost,non-toxicity and excellent photoelectric performance.However,Sb2S3-based solar cells still have a certain distanee from the industrialization efficiency,mainly due to the shortage of charge generation and transfer efficiency in the solar cells.In this paper,ZnO/Sb2S3-based sensitized cells and heterojunction cells with different nanostructures were prepared.By modulating ZnO nanostructures and Sb2S3 doping,the charge generation efficiency and charge transfer efficiency in solar cells were improved.Moreover,the charge generation and transfer mechanism of different structure based solar cells was further studied to further improve the overall performance of the two solar cells.The main research results and conclusions are performed as follows:1.ZnO nanowire array thin films are successfully prepared by electrochemical deposition method with zinc nitrate solution as electrolyte at 70?.The ZnO nanowires are annealed along the C axis after annealing at 450?.ZnO nanowire films of different sizes and thicknesses can be obtained by adjusting the time of the electrodepositionprocess.The analysis shows that the ZnO nanowire array film with deposition time of 30 min has the best electron transport performance in Sb2S3 sensitized solar cell.On the other hand,the Sb2S3 light absorbing layer is successfully prepared by successive ionic layer adsorption and reaction with sodium sulfide solution and acidic ruthenium chloride solution.The FTO/ZnO/TiO2/Sb2S3/Cu2S sensitized soalr cell has achieved a photovoltaic conversion efficiency of 1.03%.2.By doping a low concentration of Cu2+ into the FTO/ZnO/TiO2/Sb2S3/Cu2S sensitized cells,the optical andphotovoltaic properties of the cells are improved.Different Cu atom doping concentrations have different effects on the phovoltaic performance of solar cells..It has the best photovoltaic conversion effeicncy of solar cells,which has doped the concentration of Cu2+.In result,the photovoltaic conversion efficiency of 1.17%is obtained for Cu2+ doped FTO/ZnO/TiO2/Sb1S3/Cu2S sensitized solar cell.3.The sol-gel method is used to prepare ZnO sol with zinc acetate,ethylene glycol methyl ether and ethanolamine as reactants.The ZnO nanoparticle film is successfully prepared at 3000 rpm by spin-coating process.There have diffent crystal plane orientations for ZnO thin film under different temperature of heat treatment.And high diffraction peak can be observed on(002)crystal plane orientation at the heating temperature of 500?,which has the best electron transfer performance.The Sb2S3 sol is prepared by sol-gel method with thiourea,ethylene glycol methyl ether and cesium chloride.The Sb2S3 film is successfully prepared at 3000 rpm by spin-coating process.The FTO/ZnO/Sb2S3/Au heterojunction solar cell has exhibited a photovotlaic conversion efficiency of 0.44%.4.The optical and photovoltaic properties of the solar cells are improved by doping a low concentration of Cu into the FTO/ZnO/Sb2S3/Au heterojunction solar cell.Different Cu2+doping concentrations have different effects on the photovoltaic performance of solar cell.With the Cu concentration of 3%,theCu-doped FTO/ZnO/Sb2S3/Au heterojunction solar cells have the best photoelectric conversion efficiency of 0.51%.