Preparation Of Flexible Transparent Conductive Film ASA And Its Application In Solar Cells

As the main material of transparent conductive films(TCFs),due to its excellent optical and electrical properties,Indium tin oxide(ITO)is widely used in various types of optoelectronics devices,such as Organic Light-Emitting Diode(OLED),touch screen and solar cell applications.However,ITO’s high cost,toxicity,and brittle properties limit its use in flexible optoelectronic devices.As a result,the search for and development of other materials that can replace ITO has gradually become a research hotspot.Silver nanowires(Ag NWs)and single-walled carbon nanotubes(SWCNTs)are ideal materials for flexible transparent conductive films due to their good photoelectricity and stability.Methods for optimizing Ag NWs transparent conductive films mainly include halide solution treatment,mechanical pressing,plasma welding,etc.At present,the optimization of the photoelectric performance of Ag NWs transparent conductive films and their application in photovoltaic devices have become hot research.The research contents of this paper mainly include:(1)The transparent conductive film of Ag NWs-SWCNTs/AZO(ASA)densed composite nested structure was prepared by ultrasonic spraying technology and magnetron sputtering technology,and the dispersion quality of carbon nanotube solutions under different conditions,the different dilution ratios of silver nanowires and isopropanol solutions,and the volume ratio of silver nanowires and carbon nanotubes under certain concentration conditions were explored.The effects of the process conditions and coverage thickness of the magnetron sputtered metal oxide AZO protective layer and the spray width size and combination during ultrasonic spraying on the photoelectricity,stability and micromorphology of the composite film.By characterizing and analyzing the photoelectricity,stability and morphological characteristics of ASA conductive film,the optimal process conditions for the preparation of ASA conductive film are obtained.Studies have shown that when the surfactant is sodium dodecylbenzenesulfonate(SDBS),the dispersion quality of carbon nanotube aqueous solutions is optimal;When the dilution ratio of silver nanowires to isopropanol is 20,the solution volume ratio of silver nanowires to carbon nanotubes is 4:1,the thickness of the AZO protective layer is 30 nm,and the dense nested structure is prepared by spray width of 1.5 mm and 0.5 mm,the photoelectric performance of ASA thin films is best(R_s=17Ω/sq,T=92%@550 nm).(2)The ASA transparent conductive film is applied as a back electrode to flexible transparent amorphous silicon thin-film solar cells(FAFSC),and the influence of deposition temperature and cell structure on the output characteristics of FAFSC is explored,and the stability during bending and long-term placement is tested.It is found that because high temperature will enhance the deposition quality and photoconductivity of amorphous silicon thin films,the output characteristics of FAFSC show a gradual increase trend as the deposition temperature of amorphous silicon thin films rises.Under the same conditions,due to the excellent optical properties of the ASA conductive film,the complex trap structure,and the large contact area with the P-type amorphous silicon layer,which improves the transport capacity of the carrier,when the ASA conductive film is used as the back electrode of FAFSC,the photoelectric conversion efficiency is higher(PCE=8.69%);After 3000 mechanical bending tests,the output stability of FAFSC remains in good condition,and the photoelectric conversion efficiency is only changed.