Research On Optoelectronic Properties Of Silver Nanowire/Graphene Transparent Conductive Films In Wide Spectrum

The transparent conductive film is a transparent flexible conductive film,which combines good conductivity and high permeability.With the advancement of modern science and technology,the traditional transparent conductive film indium tin oxide will be replaced by some new transparent conductive films due to the shortage of raw materials and high brittleness.As a new type of transparent conductive material,both silver nanowires and graphene exhibit excellent photoelectric properties.The high transmittance and low sheet resistance characteristics of the two materials composite set off an upsurge in the research of new transparent conductive films.This paper focuses on the preparation and performance analysis of silver nanowire /graphene wide-spectrum transparent conductive films.the main research contents and results are as follows:The silver nanowire films with excellent performance and good uniformity were prepared by deep exploration of spin coating process.The effects of spin coating time and spin coating rate parameters on the performance of silver nanowires are studied in the preparation process,and the optimal experimental conditions for the uniformity of the prepared uniform films were determined.A series of concentration / photoelectric performance laws were obtained by studying the effects of different concentrations of silver nanowire dispersions on the film properties.Finally,silver nanowire films with excellent comprehensive properties were prepared with the sheet resistance of 105.8Ω/sq and the average optical transmittance of 76.4%in the wide spectrum band with 0.4～10.5 μm.The silver nanowire film with the best comprehensive performance prepared in this paper was selected,and the film is treated by HCl vapor-induced chemical nano-welding and thermal annealing nano-welding to reduce the contact resistance between silver nanowires and improve the film conductivity of film.Through the comparative analysis of the results,it was found that compared with the HCl vapor-induced chemical nano-welding of silver nanowires,the thermal annealing nano-welding process has the advantages of stable welding,no chemical residual and convenient operation.By studying the effects of thermal annealing time and temperature on the film properties,the optimum annealing temperature was 190℃ and the optimal annealing time was 10 min,which effectively fuses the node between nanowires,reduces or even eliminated the contact resistance between nanowires,and improved the conductivity of the film.The silver nanowire / graphene composite films with two different structures were prepared by spin coating and transfer graphene in different orders.The morphology,sheet resistance and light transmittance of two kinds of films with different structures were analyzed.It is found that the prepared composite film prepared by spin-coating silver nanowires and nanowires transfer graphene showed better photoelectric properties.Through a series of experiments and characterization,we analyzed the adhesion,surface roughness and environmental stability of the composite films.Compared with the silver nanowire film prepared in this paper,the properties are greatly improved.The silver nanowires / graphene composite film was treated by thermal annealing nano-welding,and the node between nanowires are welded at 190℃ for 10 minutes which further improves the performance of the composite film..The final silver nanowire / graphene composite film has a high transmittance in a wide range of 0.4μm to 10.5μm,and the sheet resistance is as low as 34.7Ω/sq.This work provides a new idea for the application of silver nanowire / graphene composite film in wide spectrum photoelectric devices.