Study On The Preparation And Properties Of Planar Heterojunction Perovskite Solar Cells

With the energy shortage caused by economic development and the worsening environmental damage,people's demand for green energy becomes more and more urgent.Solar energy due to its inexhaustible reserves,clean and pollution-free,in-place development and utilization of other characteristics has aroused people's attention.Among various types of solar cells,perovskite solar cells have drawn much attention from all walks of life due to their advantages of low preparation cost,high absorbency and simple structure.Combined with the current research progress of perovskite solar cells,the preparation process of one-step perovskite thin films,the effects of different electron transport layer structures on the performance of the cell devices,and the use of organic small molecule materials TmPyPb as cathode interface modifications for calcium titanium Research and discussion on the effect of ore solar cell device performance.(1)We The preparation process of perovskite thin films prepared in one step was studied and the influence of the annealing time and the concentration of the solution on the performance and device performance of the thin films were investigated.The experimental results show that the direct one-step method of spin-coating perovskite films with MAI and Pb I2 dissolved in a mixed solution of GBL and DMSO(7:3 v/v)can produce uniform dense high-quality films.When the molar ratio of MAI and Pb I2 is 1:1,and the annealing time of the light-absorbing layer is 5 min,the performance of the battery device is optimized.Under the standard light conditions,AM1.5(100 mw cm-2)achieves photoelectric conversion of up to 12.21%.effectiveness(2)Study the use of different electron transport layer structures to prepare perovskite solar cell devices without inert gases and incomplete isolation of water and investigate the effect of different electron transport layer structures on the device.Using different electron transport layers PC71BM/C60,PC61BM/C60,and C60 to fabricate battery devices,the results show that when the electron transport layer structure is PC71BM/C60,the performance of the battery device is effectively improved.The device has an optimum photoelectric conversion efficiency(PCE)of 14.08% and an average efficiency of 13.50%.(3)We study high performance planar perovskite devices with TmPyPb as a cathode buffer layer prepared without in an inert atmosphere irrespective of the humidity.High crystalline CH3NH3 Pb I3 films are prepared by two-step spin coating with relative humidity(RH)as high as 45% explored the effect of TmPyPb thickness on the cell device.The results show that the two-step method of separate spin-coating the MAI solution and Pb I2 solution can produce a high-quality perovskite light-absorbing layer.Use the organic small molecular material TmPyPb to modify the interface between Fullerene(C60)and metal electrode Al,resulting in a dramatic efficiency enhancement for the PSCs.Under the optimized thickness of 5nm,the power conversion efficiency of the device is enhanced to 11.91% and the device performance is optimized.