Study On Synthesis And Properties Of Perovskite/Black Silicon Tandem Solar Cells

The development of human beings cannot be separated from energy.As a kind of abundant clean energy,the development and utilization of solar energy has been attracting the attention of domestic and foreign researchers.Since the first generation of solar cells came into being,the field of solar cells has achieved fruitful results.At present,silicon-based solar cells account for the highest proportion in the global photovoltaic market,accounting for more than 90%.Facing the reality of high production cost and low efficiency,more researchers focus on the field of tandem solar cells.The principle of tandem solar cells is to maximize the use of sunlight by using the characteristics of different band gap width and response in the spectral range of the two sub cells,so as to improve the conversion efficiency of solar cells.This paper focuses on the preparation of perovskite cells and black silicon solar cells.The transparent organic-inorganic hybrid perovskite solar cell is prepared by the whole solution method.ITO film with excellent light transmittance is used as the top electrode,and CH3NH3 Pb I3 is used as the light absorbing layer.The effects of the film process parameters of the titanium oxide compact layer,the titanium oxide mesoporous layer and the calcium titanium ore layer on the photoelectric performance of the cell are studied.The optimal spin coating rate of the titanium oxide compact layer is determined to be 3000 rpm/min.The best mass ratio of titanium oxide slurry to ethanol is 1:6.The highest transmittance of the mesoporous film is 98.33%,and the conversion efficiency is 15.79%.The optimal molar ratio of Pb I2 to CH3NH3 Pb I3 is 1:1,and the conversion efficiency of the battery device prepared under this molar ratio is 13.16%.Silicon nanostructures are prepared by wet etching.The effects of Cu(NO3)2 concentration,reaction time of Cu(NO3)2 solution,H2O2 content and reaction time of H2O2/HF mixed solution on the surface morphology and reflectivity of silicon nanostructures are studied.The optimal process parameters are as follows: Cu(NO3)2 concentration is 0.015 mol/L;H2O2 content is 1% or 1.5%;Cu(NO3)2 solution reaction time is 30 s or 40 s;the reaction time of H2O2/HF mixed solution is 3 min or 4 min.The lowest reflectivity is 1.18%.Black silicon solar cells are fabricated by sputtering Ag and ITO electrodes on the upper and lower surfaces of silicon nanostructures.The conversion efficiency of black silicon solar cells with different silicon nanostructure process parameters are studied.The optimal silicon nanostructure process parameters are as follows:(1)perovskite solar cells: the spin coating rate of Ti O2 compact layer is 3000 rpm/min;the mass ratio of slurry to ethanol in Ti O2 mesoporous spin coating solution is 1:6;The mole ratio of Pb I2 and CH3NH3 Pb I3 in the perovskite layer spin coating solution is 1:1;(2)black silicon solar cell: the concentration of Cu(NO3)2 is 0.015 mol/L,the reaction time of Cu(NO3)2 solution is 30 s,the content of H2O2 is 1.5%,and the reaction time of H2O2/HF mixed solution is 3 min,the efficiency of the tandem solar cell is 20.06% under the process parameters.