Preparation And Properties Of External Photoanode Dye-sensitized Solar Cells

At present,the dye-sensitized solar cell is mainly a traditional sandwich structure,and the electrode is mainly composed of conductive metal oxides,such as FTO and ITO,etc.Due to its high cost,scarce elements,and difficult to meet the requirements of flexibility,the development of the structure with metal substrate as the electrode is particularly important.Different from transparent conductive oxides,metals do not have light transmittance.At present,most studies take metal as the substrate of one of the photoanode and counterelectrode,while the other side still uses transparent conductive oxides as the electrode to ensure light irradiation to the active layer.There are also a few studies using metal mesh instead of transparent counter electrode,but the complexity of the process increases the manufacturing cost,and the loss of light energy caused by the wire mesh also reduces the photoelectric characteristics of the device.In this paper,the active layer is prepared on the outside of the open-hole stainless steel electrode,and the electrolyte is connected with the active layer and the opposite electrode through the hole,which ensures the transfer and exchange of charge and eliminates the loss of light energy caused by the electrode.This article will be the new battery structure compared with traditional FTO electrode dye sensitized cells,in in addition to the electrode materials of the same situation,traditional FTO electrode dye sensitization battery photoelectric conversion efficiency is 8.26%,the photoelectric conversion efficiency is 0.83%,according to a stainless steel electrode cell the cause of the inefficient main factor is the short circuit current and the fill factor is small,but its open circuit voltage device similar to conventional batteries.Compared with the new structure battery,the results show that the new structure,compared with the existing pure metal electrode backlight structure,not only saves the cost in the process,but also improves the efficiency.In addition,a new type of cell with titanium foil as the base was tested in this paper.The open circuit voltage VOC of the new type of cell with titanium photoanode was 0.71V,the short circuit current ISC was 8.87 m A/cm²,and the photoelectric conversion efficiency was 3.86%.The results show that the new structure is not only suitable for stainless steel materials,but also has obvious effects on some other metal substrates.The results show that the size of the holes has almost no effect on the efficiency of the battery.It can be inferred that the small pore size does not limit the ion diffusion in the electrolyte.Therefore,if the process permits,the hole diameter can be reduced as much as possible to ensure a larger active layer area.Like back according to the type battery structure,light takes to arrived in the new structure of the active layer through a layer of electrolyte,so different from traditional transparent electrode battery,the electrolyte is not only need to consider its transport^-and₃^-ability,also must be comprehensive consideration of the pervious to light,through the test of different concentration of solute dissolved in acetonitrile after uv-vis transmission spectra,found that iodine elemental had the greatest influence on the properties of pervious to light,and by testing the battery photoelectric conversion efficiency under different concentration of solute,determine the I₂ and Li I concentration of 0.048 M and 0.48 M is the most suitable for the new structure of the battery electrolyte formula.To sum up,this paper proposed a new battery structure,the use of pure metal electrodes,compared with traditional transparent conductive film battery electrode,have better flexibility,lower cost,and compared with the existing pure metal electrode cell,process is more simple,utilization rate of material area is bigger,also had higher photoelectric conversion efficiency.However,compared with the traditional battery,although the cost is reduced,the battery efficiency is still not ideal.The exploration of this structure can be further deepened.This paper aims to provide a new idea for the development of photovoltaic conversion devices or photoelectric detectors.