Passivation of Surface Defects via Small Molecule Bilayer Engineering for Metal Oxide Nanoparticle-based Organic Photovoltaic Cells
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초록
내용
In this study, metal oxide with a thin film of non-fullerene small molecule is introduced to develop organic photovoltaics (OPV) with more efficient charge extraction. Solution-processed metal oxide nanoparticles inevitably have numerous oxygen vacancies, which reduce the electron flow in the device. Therefore, an N-type PDI (perylene diimide) derivative was used as a surface modifier to reduce the surface defects of the metal oxide electron transporting layer of OPV. The PDI derivative has symmetrical aliphatic amine groups at both ends and was deposited between the electron transport layer and the active layer. The surface modification effect of the PDI derivative effect on the photovoltaic properties and stability is discovered by fabricating devices. Furthermore, the surface morphology of the film was analysed by atomic force microscopy, the electron resistance and extraction were verified by impedance and space charge limiting current.