High LUMO level Non–fused Ring Electron Acceptor with Compositional Modulation Ternary Strategy for Balanced Organic Photovoltaics and Photodetectors
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Organic photovoltaics and photodetectors have attractive potential for energy harvesting and photodetecting capabilities. In this work, we designed “LK-2” a novel non-fused ring electron acceptor (NFREA) with a high lowest unoccupied molecular orbital (LUMO) level. We focused on enhancement of light energy harvesting performance in OPVs and light signal detecting ability in the OPDs. We incorporated the LK-2 into the host photoactive material using a ternary strategy considering the miscibility and energy levels. The inclusion of LK-2 contributed an improved VOC of 0.84 V, and a significantly suppressed dark current density of 2.77×10-10 A cm−2 under self-powered condition. Moreover, LK-2 roles suppression of the bimolecular recombination under mid−low light intensities and reduction of noise current. This work highlight promising potential of newly designed NFREA which can contribute for enhancing the light energy harvesting and detecting performances, simultaneously.