Abstract
Two isomeric fused‐ring electron acceptors F7TC‐1 and F7TC‐2 with different molecular symmetry are designed and synthesized, and the effect of molecular symmetry is studied. All side chains are located on the same side of the fused‐ring core in axisymmetric F7TC‐1, whereas they are evenly located on both sides of the fused‐ring core in centrosymmetric F7TC‐2. The molecular symmetry shows slight effects on the absorption spectra, energy levels, and bandgaps of the two molecules, but notable effects on crystallinity, molecular packing, film morphology, and device performance. F7TC‐1‐ and F7TC‐2‐based organic solar cells show power conversion efficiencies of 1.08% and 11.14%, respectively. Different molecular packing and film morphology lead to a big difference in device performance.
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