Preparation And Properties Of Inverse Perovskite Solar Cells Based On CuI As P-type Materials

A solar cell is a device that converts solar energy directly into electrical energy.The development of solar energy can be divided into three generations: the first generation of crystalline silicon cells;the second generation of thin-film batteries;the third generation for the new concept of the solar cell.The MAPbI3 perovskite material has become a hotspot in the new concept solar cells because of its advantages of high light absorption,long carrier lifetime and large carrier diffusion length.The structure of the solar cell has mesoscopic solar cells and planar heterojunction solar cells.One of the anti-type of planar heterojunction solar cell due to the hysteresis effect is small,low temperature preparation and concern.Where the hole transport layer serves as a window layer of the cell not only to transmit holes but also to provide better transmission,whereas the perovskite light absorption layer is also important as a provider of electron hole pairs.Therefore,this paper will be different hole transport layer on the perovskite and solar cells performance of the study,mainly including the following aspects:(1)Preparation of CuI thin films for hole transport layer.CuI has the advantages of high hole mobility,wide band width and stable physical and chemical properties.It is often used as a hole transport layer.In this paper,impregnation method,solution ultrasonic method and vacuum deposition deposition method were used to prepare.In the dipping method,since the adhesion between the substrate and the substrate is poor,it is difficult to obtain a completely dense film.In the case of the ultrasonic method,the film was prepared by controlling the ultrasonic time,and it was found that the film obtained by this method was not uniform.When using this method,the experimental parameters can be well controlled,so the reproducibility of the experiment is better when the method is used to prepare the CuI film with high density and large particle size.(2)Preparation of MAPbI3 perovskite thin films.A one-step method was used toprepare the perovskite film.Firstly,the effect of solvent on the formation of thin films was studied.It was found that the crystallinity of the films was better when the ratio of DMSO to DMF was 3: 7,and the particle size was larger.Secondly,MAPbI3 films were prepared by hot air and anti-solvent method respectively.It was found that the films prepared by anti-solvent method were more dense.Finally,the step-by-step annealing of the anti-solvent preparation film was improved by step annealing,and it was found that the particle size of the film was improved after the improvement.(3)Effects of different hole transport layers on the properties of perovskite films and solar cells.First,the effect of CuI,PEDOT: PSS,CuI / PEDOT: PSS on the formation of perovskite films was studied.Thirdly,the effects of three different hole transport layers on the performance of the cells were studied.It was found that the photoelectric conversion efficiency was 11.52% when using the double hole transport layer.Finally,the effects of chlorine doping on the performance of the hybrid perovskite films were studied.