| The worsening climate and environmental problems have made solar energy more and more popular.At present,the photovoltaic performance of the new generation of solar cells based on organic-inorganic halide perovskite absorber layers,which has attracted much attention from domestic and foreign researchers,still has problems such as low energy conversion efficiency and poor battery device stability.optimize device performance,and uses solvent engineering to improve the performance of environmentally friendly lead-free tin-based perovskite solar cell devices,my research work mainly focuses on the following three aspects:?1?Lead iodide and methyl ammonium chloride were used as the constituents of the precursor solution of the organic-inorganic halide perovskite absorption layer to achieve the crystal orientation of the perovskite layer,and then the structure of device wass optimized,and lastly explore the different precursor liquid solvent ratio to improve the overall performance of the device,finally make the performance of the entire battery device significantly improved.The results showed that the morphology of the perovskite thin film prepared by using a molar ratio of MACI:Pb I2=1:1,a volume ratio of solvent DMF:DMSO of 5:5,and an annealing temperature of 110?was the best.The device prepared on the Ni Ox hole transport layer has the best performance.The power conversion efficiency?PCE?has increased from the initial 6.72%to 12.29%,and the open circuit voltage,short circuit current,and fill factor of the device have been significantly improved.?2?Environmentally-friendly lead-free tin-based perovskite solar cell devices were prepared by replacing the toxic element Pb with the low-toxic element Sn.By changing the mass ratio of the?-hydroxy acid citric acid additive in the FASn I3 perovskite precursor solution to regulate the perovskite film morphology.The study compared the film morphology and device performance when the additive mass ratio?relative to the mass of lead iodide?was 0wt%,1wt%,5wt%,8wt%,10wt%,12wt%,15wt%.It helps to improve the morphology of Sn perovskite thin film and improve the performance of the device.With the increase of the amount of additives,the cell size will increase first and then decrease,and the corresponding device efficiency will also show the first The law of increase and decrease,the battery exhibits the best energy conversion efficiency when the additive mass ratio is 8wt%.Compared with standard devices,the open circuit voltage is increased from 0.21V to 0.38V,and the device efficiency is increased from 0.74%to 2.02%.?3?The chiral molecule L-tartaric acid was added to the mixed cationic FA0.75MA0.25Sn I3perovskite antisolvent to control the morphology of the Sn-based perovskite film and induce the preferred orientation of perovskite crystals.The study compared the characteristics of the device performance,surface morphology,wettability,and photoelectric characteristics when the concentration of the reverse solution was 0mg/m L,0.5 mg/m L,1.0mg/m L,and 1.5 mg/m L.The results showed that with the concentration of the reverse solution of L-tartaric acid With the gradual improvement,the efficiency of the device increases first and then decreases.When the concentration of the reverse solution L-tartaric acid is 1.0 mg/m L,the perovskite solar cell shows the highest energy conversion efficiency.Compared with the standard device,the short-circuit current is from 13.58 m A·cm-2increased to 16.52 m A·cm-2,the device efficiency increased from2.37%to 4.24%. |
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