Systematic Y6 Inner Side-Chain Modulation Enabling Optimized Vertical PhaseSeparation for Non-Halogen Solvent Processed Inverted Organic Solar Cells
발표자
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초록
내용
The curvature shape of Y6 allows for dense intermolecular packing in a grid-like manner. Given this, the modification of branched alkyl chains located on the pyrrole motif of Y6 is expected to have a significant impact on morphological properties (e.g., molecular packing, orientation, and vertical phase separation). In this work, we fine-tune the branched alkyl chain located inner side of the Y6 and systematically investigate the relationship between the morphological features and photovoltaic performance. Additional in-depth analyses reveal that the modification of branched alkyl chains allows the formation of an optimized bulk heterojunction morphology, which is advantageous for an inverted device architecture. In particular, the PM6:Y6-HU-based inverted OSC utilizing o-xylene as a processing solvent achieves PCE of 17.4% and FF of 77.9% under the binary blend system and single non-halogen solvent processing.