Study On Organic Solar Cells Based On Double Interface Modification Layer

With the increase of population and economic development,human demand for energy is growing.However,the excessive use of fossil fuels can cause serious energy depletion and environmental pollution problems.Therefore,cleaning renewable solar energy is an ideal alternative energy source.Nowadays,organic solar cells have become a hot research topic because of their wide sources of materials,low cost,simple preparation process,and the ability to make large-area flexible devices.Now,the energy conversion efficiency of known organic solar cells can approach 15%.but this still does not meet the requirements of large-scale commercial production.In order to improve the energy conversion efficiency of organic solar cells,common methods include:introducing an interface modification layer,regulating the morphology of the active layer,doping,and so on.The introduction of the interface modification layer can reduce interface traps,improve the electrode work function,adjust the arrangement of interface barriers,and suppress defects between the electrode and the photoactive layer material.This paper mainly introduces the interface modification layer to improve the energy conversion efficiency of the device.1.ZnO and Alq₃ have been used to form the bilayer structure as a cathode interface modification layer,and preparing an organic solar cell with a device structure of ITO/ZnO/Alq₃/P3HT:PC₆₁BM/MoO₃/Ag.By comparing the ZnO single-layer structure device and the ZnO/Alq₃ double-layer structure device,study the effect of Alq3 on the performance of organic solar cell devices and the advantages of the dual cathode interface modification layer.After inserting Alq₃,a better interfacial contact can be formed between the electrode and the photoactive layer,ZnO surface traps can be passivated and ZnO surface roughness can be reduced.The double cathode interface modification layer can reduce the leakage current and dark current of the device,make the device has better diode rectification characteristics.It can also improve carrier transmission,suppresses carrier recombination,and enhances the photoelectric conversion capability.The energy conversion efficiency of thus prepared solar cell is up to 4.17%,which is improved by 36.3%compared to the single cathode interface modification layer device,and the device performance has been greatly improved.2.PTFE/V₂O₅ bilayer structure was introduced as the double anode interface modification layer.The device structure of the organic solar cell is ITO/PTFE/V₂O₅/PCDTBT:PC₇₁BM/LiF/Al.The PTFE/V₂O₅ bilayer structure can improve the work function of ITO,and reduce the interface barrier height of hole transport,and thus contribute to the extraction of holes.After introducing PTFE/V₂O₅ double anode interface modification layer,it can inhibits carrier recombination,reduces surface roughness,provides good growth subatrate for the photoactive layer,and conducive to the transport of holes.The organic solar cell thus prepared has an energy conversion efficiency of up to 6.52%,which is improved by 11.5%compared to the single anode modified layer device.In this paper,through the above two experiments,the influence of double interface modification layer on the performance of organic solar cell is studied.By comparing the difference between single and double interface modification layers,we explored the impact of device structure on solar cell performance.It provides a new method for the commercial development of organic solar cells.