Performance Optimization Of Nanowires For Photovoltaic Power Generation In The Field

As a strategic material in the world today,petroleum is called the"blood"of modern industry and has an irreplaceable status,which is related to national security and the lifeline of the national economy.With the rapid development of the social economy,the demand for petroleum energy in various industries has shown an increasing trend,but its exploration and mining operations are usually in places that cannot be covered by the power grid,which makes it difficult to supply power.In order to reduce operating costs and improve work efficiency,solar cells are increasingly used in petroleum operations.As one of the most promising solar cell materials,Ruddlesden-Popper?R-P?layered perovskite has the advantages of high photoelectric conversion efficiency,good stability,simple preparation process and low cost.The one-dimensional nanostructure can effectively improve light absorption and provide a direct transport path for photogenerated carriers.Based on this,it is envisaged to combine R-P perovskite with one-dimensional nanowires to construct a new type of solar cell structure:a shell-core nanowires array with a transport layer material as the core and the R-P perovskite material as the shell.In this paper,the titanium dioxide electron transport layer was selected as the core material,and R-P perovskite nanowires,titanium dioxide nanowires arrays,and shell-core nanowires arrays were prepared respectively,and the properties were adjusted by changing the preparation process and composition.The main conclusions are as follows:?1?R-P perovskite nanowires were prepared by solution method.The effects of composition?n-value,X-site doping?on the crystal structure,surface morphology and photoelectric properties of the samples were investigated.The results show that with the increase of n value?n=1⁴?,the absorbance of R-P perovskite nanowires decreases and the band gap increases.The optimal value of n=2 is determined by considering the combination of stability and conductivity.On the basis of this,the Cl or Br were doped at the X site.The results show that the doping of Cl and Br reduces the absorbance and the band gap increases,so X=I is the best.Therefore,the R-P perovskite nanowires?CH₃?CH₂?₃NH₃?₂?CH₃NH₃?Pb₂I₇has the best photovoltaic performance?open circuit voltage is 0.830 V,short circuit current is59.383 mA,fill factor is 32.59%,and photoelectric conversion efficiency is 16.066%?.?2?Titanium dioxide nanowires arrays were prepared by hydrothermal method.The effects of different process parameters?reaction time,butyl titanate,annealing atmosphere?on the crystal structure,surface morphology,transmittance and leakage current of the samples were investigated.The results show that under the optimized process parameters?reaction time is 6 h,butyl titanate is 270?L,annealing atmosphere is O₂?,the prepared titanium dioxide nanowires arrays has no obvious agglomeration phenomenon,high transmittance and low resistance in the visible range,and is the most suitable for electron transport layers of the solar cells.?3?On the basis of the above research,the R-P perovskite shell was prepared on the titania nanowires by soaking method and spin coating method,and the shell-core nanowires arrays with titanium dioxide as the core and R-P perovskite as the shell was constructed.And the effects of composition and preparation process on the performance of the shell-core structure nanowires arrays were further studied.The results show that when the soak time is 1h,the core nanowires arrays is completely covered by the shell layer,and the nanowires have no obvious agglomeration.On this basis,the influence of the composition of R-P perovskite material?n-value,X-site doping?on the crystal structure,surface morphology and photoelectric properties of the sample was studied.The results show that when n=2,X=I,The shell-core nanowires arrays has a large absorbance and the best photovoltaic performance?open circuit voltage is 0.755 V,short circuit current is 75.709 mA,fill factor is 18.37%,and photoelectric conversion efficiency is 10.498%?.