Ethylene Glycol Functionalized Graphene Realize Flexible Perovskite Solar Cells

With people's continuous cognition of science and technology,a brand-new world has entered "scientific and technological information".At the same time as the rapid development of science and technology,people continue to push technology to green energy,environmental protection and low cost.As an important part of the environmental technology industry,green energy batteries have always played a very important role in the development of information technology.From the 19 th century to the present,solar cells have been developed to the third generation.Among them,perovskite solar cells(PSCs)have become brilliant in modern technology because of their excellent performance,low cost and great commercial value.As the demand for solar cell technology increases,the PSC continues to evolve in a bendable,foldable direction.As the most widely used anode material for PSC,indium tin oxide(ITO)is gradually being replaced by other anode materials with excellent mechanical properties due to its expensive raw materials and environmental pollution.Currently,transparent flexible conductive electrodes that we commonly use to replace ITO include nanowires,carbon nanotubes,graphene,and conductive polymers.Among them,graphene has become one of the materials that researchers have paid attention to in recent years due to its excellent electrical conductivity,optical properties and excellent toughness.In order to have better flexibility in the selection of electron transport layers(ETLs),we use atomic layer deposition ALD to grow oxide films instead of spin coating.This chemical self-limiting adsorption feature makes the product strong in binding,dense in composition,and has almost no defects,which can improve the flexibility of the electron transport layer.However,hexagonal two-dimensional carbon nanomaterials composed of C-C bonds on the surface of graphene have no chemical bonds for the chemisorption reaction of ALD except for fewer defects on the surface.In this paper,molecule layer deposition(MLD)single pulse modification of graphene is used to modify the graphene surface with MLD single pulse ethylene glycol before growing ALD oxide on graphene.By adjusting the pulse time and controlling and characterizing the interface matching between graphene/ALD oxides,the power conversion efficiency(PCE)of PSC with or without ethylene glycol treatment was compared.The final test results show that the graphene ALD composite film treated with ethylene glycol has lower square resistance,smoother roughness and higher transmittance in physical characterization of the film;In terms of optics,the work function of the composite film treated by this method is more matched with the electron injection layer of the next layer,and the PCE of PSC can be increased by 133.9%;In terms of flexibility,the PCE can be maintained to 92.2% of the initial PCE with a bending radius of 9 mm bent 1000 times.