The Application Of TiO₂ Nanofiber Mesoporous Layer In Perovskite Solar Cells

Perovskite solar cells are highly concerned because of their high efficiency and low cost.The structure of the perovskite solar cells can be divided into planar hetero junction perovskite solar cell structure,mesoscopic perovskite solar cell structure.the mesoporous structure is used by titanium oxide particles,alumina particles,mesoporous structure is a suttcold role.Since the titanium oxide particles are n-type semiconductors,so the titanium oxide nano particles can also be used to transmit electron.But the titanium oxide particles are not better to transmit electron,in order to make titanium oxide can be better to transmit electron,In this paper,titanium oxide nanofibers are used to replace titanium oxide particles in order to improve the electron transport capacity of titanium oxide mesoporous layer.nanofibers are obtained by electrospinning.In order to improve the ability of titanium oxide nanofibers and to transmit electron well,we attempt the application of microscale reduced oxidation graphene in titanium oxide nanofibers,and study the effect of rGO/TiO₂ composite nanofibers as mesoporous layer on the properties of perovskite solar cells.Specific research work is as follows:1.The titanium oxide dense layer was prepared by sol-gel method through the glue machine for spin coating.We discussed the effects of the rotation speed and the order of rotation,drying and annealing on the morphology of the dense layer.When the rotation speed was 5000 r / min,the film was dried in a drying oven at 80 ? for 2hours,repeat the whole process 3 times,and put it in the tube furnace for annealing.Then get the titanium oxide is relatively smooth,dense.2.The perovskite layer was prepared by two-step method,we studied the effect of annealing temperature on perovskite layer.The test results show that when the initial annealing temperature is 55 o C with a certain heating rate rose to 100 ? and keep annealing at 100 oC for 30 min,the perovskite is better in all aspects of performance.3.TiO₂ nanofibers were prepared by electrospinning.We discussed the effects of different thickness of titanium oxide nanofibers on the efficiency of perovskite solar cells.The results show that when the spinning time is 5 min,the efficiency of the battery is higher relative to the plane heterojunction.perovskite solar cell efficiency would reduce according too long or too short time.4.In order to further improve the electron transport capacity of titanium oxide nanofibers,we attempt the application of microscale reduced oxidation graphene in titanium oxide nanofibers,The rGO /TiO₂ composite nanofibers were obtained by electrospinning,the spinning time is 5min,We studied the effect of rGO /TiO₂ composite nanofibers as mesoporous layer on the properties of perovskite solar cells.The results show that the performance of the cell is higher than that of the planar heterojunction.