Study Of Flexible Organic Solar Cells With Cascaded Structure Based On PM6:Y6 System

In recent years,the research on organic solar cells has developed rapidly.With the emergence of new non-fullerene receptor—Y6,the power conversion efficiency of binary heterojunction organic solar cells has reached more than 15%.Organic materials have good flexibility,processability and conductivity,so organic solar cells have excellent development potential and great commercial value.Now,the organic solar cells fabricated in the lab stage generally use rigid substrates,and most of the areas are less than 0.1 cm~2.Therefore,based on the PM6:Y6 system,this thesis mainly studies the theory and fabrication scheme of realizing high-efficiency flexible organic solar cell devices and large-area flexible organic solar cell modules by laboratory methods.The first part of this thesis starts from the purpose of fabricating high-performance PM6:Y6 flexible organic solar cells.Through a series of experiments,combined with the photoelectric performance,surface morphology,mechanical performance,stability and other test results of the device,the working characteristics,working mechanism and optimization path of the reverse PM6:Y6 flexible solar cell device fabricated by spin-coating method are analyzed.The experimental materials and device fabrication process suitable for PM6:Y6 were systematically summarized,and flexible organic solar cells with energy conversion efficiency of more than 12%were fabricated.The PEI-Zn/Zn O-nps bilayer electron transporting layers structure proposed in this thesis improves the energy level structure of the device while inhibiting Michael addition reaction,and finally makes the PCE of PM6:Y6 flexible organic solar cell reach 12.72%.In the second part of this paper,based on the small area PM6:Y6 flexible organic solar cell system,further research and experiments were carried out on the preparation of single large area flexible devices and flexible cascaded organic solar cell modules by laboratory methods.Analyze the limitations of the spin coating method for preparing PM6:Y6 solar cell devices,and calculate the limit radius for finger like instability based on spin coating theory.Finally,a 1.8 cm~2 with a performance of 7.98%was prepared through experiments.Single section large-area organic solar energy device,and based on this,5.6 cm~2 was prepared.The PCE of flexible organic solar cell module is 7.11%.Its voltage reaches 1.98 V and current reaches 40 m A.The device was also packaged and tested for stability in an atmospheric environment.Based on flexible solar cell modules,this article also proposes a groove structure that etches grooves at the dead zone of the solar cell module.The structure was modeled,analyzed,and simulated using ABAQUS.The simulation results confirmed the stress sharing effect of the grooves set at the dead zone,which reduced the ultimate stress on the solar cell device by more than 22%.The proposal of this structure enables the dead zone of flexible solar cell modules to be utilized.Based on the flexible solar cell module,a groove structure is also proposed in this thesis.The groove is etched at the dead area of the solar cell module.The structure is modeled,analyzed and simulated by ABAQUS software.The simulation results confirm that the groove set at the dead area shares the stress,and the limit stress on the solar cell parts is reduced by more than 22%.The proposed structure makes the dead area part of the flexible solar cell module be utilized.This paper finally formed a feasible scheme for the preparation of flexible large area organic solar cell in PM6:Y6 system.This provides a reference for the laboratory preparation and commercial promotion of flexible devices.