Optimized Study On Cathodic Transmission Characteristics Of Organic Solar Cells

In recent years,environmental pollution has brought more and more harm,and human beings have gradually awakened from the state of only paying attention to benefits and not paying attention to the environment.People use wisdom to make up for mistakes and find renewable clean energy.How to make renewable clean energy more efficient has become a difficult subject for researchers in the process of scientific research.Solar energy is very rich,but has not been used efficiently.The research and application of solar cells,which can carry out photoelectric conversion,has been carried out.Early people used silicon to prepare solar cells,but their research has been basically mature.Inorganic solar cells are no longer the current research focus,researchers begin turning to research on organic solar cells.Organic solar cells have the advantages of simple fabrication,low cost,good flexibility and large area printing.Researchers have been trying to improve the performance of organic solar cells to produce better performance devices.However,the device is still in the research stage,most of which are still in the laboratory research stage,and have not entered a large area of application.Organic solar cells also have some disadvantages,such as narrow absorption spectrum,less light absorption,poor stability and low photoelectric conversion efficiency.In this paper,suggestions will be put forward from the following aspects,such as reducing defects,promoting electronic transmission,reducing electronic loss,etc.,mainly to optimize the cathode transmission characteristics,so as to achieve the goal of higher device efficiency.The structure of organic solar cells in this paper is a ITO/ZnO/PTB7:PC₇₁BM/MoO₃/Ag for comparison.Defects of zinc oxide（ZnO）using only conventional single electron transport layer was found in previous studies,such as the charge transport barrier between inorganic metal oxide and active layer,the loss of charge in the transmission process is analyzed.By reading the literature,the above defects can be improved by two schemes.The first method is the use of indium trioxide（In₂O₃）and the PCBM of these two materials with the underlying ZnO electron transport layer to form a cascade electron transport layer.The improved device can achieve better lattice matching,reduce defects,better phase separation of active layer and improve cathode transmission characteristics.Finally,the energy conversion efficiency of the cells is 24%higher than that of the basic device.The second approach is the synthesis of Au@TiO₂ nanoparticles with core-shell structure.Doping it into the ZnO electron transport layer of organic polymer solar cells makes it not only have the advantages of improving the light absorption ability,promoting the electron transmission,but also improve the disadvantage of easy aggregation.In order to optimize the cathode transmission characteristics,the energy conversion efficiency of the cells is improved by 17%.We have successfully applied these two methods to organic solar cells.The methods of cascading electron transport layer or doping electron transport layer can improve the cathode transport characteristics,enhance the charge transport ability,reduce the loss of charge in the transmission process and improve the photoelectric conversion efficiency.