Study On Defect Mending Of Perovskite Solar Cells By Amine With Small Molecular Weight

The efficiency of perovskite solar cells has developed rapidly.After more than ten years,the maximum efficiency of certified perovskite solar cells has reached 25.5%,which is comparable to the efficiency of silicon solar cells.However,the main problem hindering the industrialization of perovskite solar cells is the long-term stability problem,and solving the long-term stability has become the key to promote the industrialization of cells.In perovskite solar cells,the perovskite photoactive layer is the main part of the leading photoelectric generation electron,which is the key to determine the power conversion efficiency and device stability.If put the unwrapped perovskite solar cells exposed to atmospheric environment,perovskite materials will be affected by water vapor and oxygen result in the photoelectric performance declining,high temperature can result in perovskite phase change,material decomposition,and process is irreversible,it is better to preparation for perovskite solar cells in anaerobic conditions,the requirements of no water in the work of preparation of cells propose a higher requirement of environment.The resistance of the device to temperature,humidity and ultraviolet radiation can be improved to some extent by interface modification or changing the internal material composition of the device,which further improves the stability of the device and prolongs the service lifetime of the device.Accordingly,it is of great significance to promote the industrialization of perovskite solar cells.In this paper,a kind of ammonium salt（ML）doped with inorganic Cs Pb I₃ perovskite layer ML small is designed.The doping of inorganic Cs Pb I₃ perovskite by A site exchange of perovskite can increase the nucleation site in perovskite and increase the number of grains,thus increasing the surface energy of grains and improving the phase stability of inorganic Cs Pb I₃.Finally,the power conversion efficiency of 9.91%was obtained by doping the perovskite of 0.5%concentration of ML.Through stability test,The undoped perovskite film is transformed into other phases in 24 hours at room temperature and 30%humidity,and has no light absorption performance.Under the same conditions,the efficiency of the doped perovskite film remained 60%of the original value after 7 days.Modification on the surface of perovskite film can optimize the morphology of perovskite film and improve the carrier transport performance to a certain extent.In this paper,small molecule 1-methylnaphthylamine is used as additive,which has certain hydrophobic and steric inhibition functions.As an aromatic group,naphthalene has strong steric hindrance effect,which has a great influence on the crystal growth kinetics.Double benzene ring structure,chemical band of bigΠkey to improve the carrier transmission rate,reduce the carrier of radiation.Organic molecules,hydrophobic effect,improve the humidity stability of the perovskite interface,forming a passivated surface layer,improve the stability of the perovskite interface.The results show that the efficiency of the device treated with 0.3%NMA is 19.4%,and the efficiency of undoped is 18.3%,improved about 5.6%.At the same time,it retains more than 90%of its original efficiency in the air after 140 hours,compared with about 75%for undoped perovskite devices.