Interfacial Modification Of Mercaptopyridine Molecules Improves The Stability Of Perovskite Solar Cells

Since its appearance in 2009,the photoelectric conversion efficiency of perovskite solar cells(PSCs)has gradually increased to 25.5%.The high conversion efficiency and low processing cost make it have the potential for commercial application.However,commercial solar cell devices must not only have high photoelectric conversion efficiency,but also have a service life of 10-20 years.Perovskite solar cells have problems that need to be solved urgently in terms of stability,cost of precious metal electrodes,and environmental pollution.These problems are huge obstacles to the commercial application of PSCs.The research of this thesis mainly focuses on the surface and interface modification of perovskite solar cells.By introducing organic small molecule layers,the stability of perovskite solar cells can be improved,and the production cost of mass production can be reduced at the same time.Perovskite materials are easily degraded in water and oxygen environments,which is the main reason for the poor stability of perovskite solar cells.Surface interface modification is an effective way to improve the stability of perovskite solar cells.The surface defects of the perovskite film will explode part of the Pb atoms,and the small pyridine mercapto molecules contain N and S atoms,which can form strong coordination bonds with Pb and improve the water resistance of the perovskite film.After constructing the pyrithione small molecule layer on the surface,the perovskite film can exist stably for more than 100 hours in the air at 25℃ and 85%humidity.In addition,the N and S atoms in the pyridine mercapto molecules can also form strong coordination bonds with Cu.The introduction of the pyridine mercapto molecules at the hole transport layer/electrode interface of the battery device also greatly improves the use of Cu as the electrode.The stability of the perovskite solar cell device enables it to maintain 80%of the initial photoelectric conversion efficiency after being stored in the air for 100 hours.The modification of pyridine mercapto molecules greatly improves the stability of perovskite solar cell devices using Cu as the electrode.In order to further reduce the production cost of battery devices,printed electronics technology can be used to prepare Cu electrodes.Chemically synthesize copper nano and micro particles,prepare conductive paste,and use it to make electrodes of perovskite solar cells.Among them,the Cu electrode prepared by the conductive paste based on copper nanoparticles has excellent conductivity,and the battery device electrode is prepared by screen printing,and the resistance can be as low as 12mΩ/□.The perovskite solar cell device using printed electrodes achieves a photoelectric conversion efficiency of 9.06%.