Abstract

HighlightsA novel fluoro-methoxylated end group for Y-series acceptors is produced, and asymmetric substitution strategy is applied as a step-by-step optimization.19.24% power conversion efficiency is achieved for industrially compatible solvent ortho-xylene processed organic solar cells.Underlying morphological and photo-physical variation is revealed for device performance difference brought by solvent selection, which could set up a template for future research on similar topics.

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