Doctor-Bladed PM6:Y6 Organic Solar Cells

Organic solar cells have attracted much interest due to their distinct benefits of low cost,lightweight,and mechanical flexibility.The photoelectric conversion efficiency of single-cell organic solar cells has exceeded 19%.But,almost all high-efficiency and small-area organic solar modules have been manufactured by spin-coating processes,which do not match the industrialized high-efficiency and large-area printing manufacturing technology.In this paper,the PM6:Y6 system organic solar cells were prepared by spin-coating and doctor-blading,and doctor-bladed PM6:Y6 organic solar cells were optimized from ternary strategy and low boiling point additive.The details are as follows:（1）Adopting a ternary strategy,IT-M materials with matching energy levels and complementary absorption to PM6 and Y6 materials were introduced as the third component.PM6:Y6 binary and PM6:Y6:IT-M ternary organic solar cells devices were prepared by spin-coating in a gloves box.By optimizing ternary organic solar cells in different ratios and morphology,photoelectric conversion efficiencies reached 15.3%and16.1%,respectively.Furthermore,PM6:Y6 organic solar cells were prepared by doctor blading under air conditions,IT-M was introduced as the third component,which achieved a photoelectric conversion efficiency of 14.8%by increasing open-circuit voltage and short-circuit current density.（2）A strategy of introducing low-boiling point additive 1,4-DFB in low-boiling point solvent was developed to improve the performance and stability of PM6:Y6:PC₆₁BM ternary organic solar cell devices prepared by doctor blading under air conditions.The low-boiling additive 1,4-DFB improves the nanostructure and morphology of PM6:Y6:PC₆₁BM ternary blend films,resulting in red-shifted film absorption,increased carrier mobility,and more balanced electron and hole charge transport properties,which together promote short-circuit current and fill factor of the devices and significantly improve the device photoelectric conversion efficiency to15.32%.The developed low-boiling additive strategy provides an important reference for the fabrication of high-efficiency,large-area organic solar cell devices by printing.This paper includes 38 figures,13 tables and 107 references.