Performance Study Of Inverted Perovskite Solar Cells Based On Bulk And Interface Passivation

As people enhanced green environmental demand,low-carbon social life is increasingly advocated.At the same time,excessive use of traditional fossil energy also causes energy shortage,and the use of traditional fossil energy will be reduced.Therefore,the research and development of new and efficient green energy has become the focus on attention.With the deepening of research,now people can benefit from solar photovoltaic power generation,which has also attracted the attention on researchers.Perovskite solar cells（PSCs）have become favorable competitors of many types of solar cells because of their high efficiency,simple preparation process,and environmental friendliness.Inverted perovskite solar cells（IPSCs）have attracted much attention because of the advantages of low hysteresis,short preparation cycles,conducting to the preparation of laminate,large-area,and flexible devices.However,the photoelectric performance of the inverted perovskite solar cell has yet to be improved compared with that of the regular devices,it is found that component engineering,additive engineering,and interface engineering are the ways to improve the efficiency and stability of IPSCs.Based on this,the main work of this paper are as follows.First,by using an additive engineering approach,we used organic ammonium cationic phenylethyl ammonium iodide（PEAI）and phenylmethyl ammonium iodide（PMAI）,which are widely used in formal devices as additives to the perovskite precursor solution.The addition of them changes the crystallinity of the film,and also changes the morphology.The PEAI thin film formed smaller perovskite particles,which hindered the carrier transport.The optimal power conversion efficiency（PCE）of the device was 20.90%,which improved compared to the Control device.The surface morphology of PMAI is better,and the best device PCE is 21.23%,an open circuit voltage(V_OC)is 1.092 V,a short-circuit current(J_SC)is 23.49 m A/cm²,and and a fill factor（FF）is 82.70%.After 1000 hours of air aging,the efficiency of the devices of PMAI is remained 75.1%,which is improved compared to the Control device.Subsequently,we used the interface engineering method to spin coat the PMAI perovskite films using choline chloride.Choline chloride,as a zwitterion,can effectively passivate the absence of halogen ions in perovskite and quaternary ammonium cations can effectively passivate the loss of cations in perovskite.It was found that the solid material formed by choline chloride at the interface could not only passivate the defects but also reduce Pb I₂ at the interface,which improved the efficiency and stability of the device.In the end,we get the best efficiency of 22.08%,V_OC is 1.122 V,J_SC is 23.42 m A/cm² and FF is 84.01%.At the same time,the hysteresis of the battery is small.In the study of stability,it is found that the device has high stability,and its efficiency remains 90.4%after aging in the air for 1000hours.