Abstract
Abstract In this study, commercially available BYK dispersants were used as interface modification layers to significantly improve the efficiency of organic photovoltaics. We selected three functional groups containing alcohols and amines from a wide range of BYK dispersants. The cell structure was inverted to the structure of indium tin oxide glass/ZnO/modified layers/PTB7-Th: PC71BM/MoO3/Ag. Because of the functional groups, the dispersants affected the surface energy, work function, and surface roughness of the ZnO layer and altered the morphology of the active layer. The power conversion efficiency of the Disperbyk-181-derived device (9.32% ± 0.13%) was higher than that of the control device (8.31% ± 0.16%). The best efficiency obtained in this study was 9.48% for a fill factor of 72%. This result promotes the commercially available functional materials for inexpensive modified ETLs and might be useful for large-area OPVs and other optoelectronic devices.
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