Effect of Bulky Long Side Chains on Physical Properties and Device Performance of Non-fused Non-fullerene Acceptors in Organic Solar Cells
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Organic solar cells (OSCs) have emerged as future energy generators and made great efforts to improve OSCs performance. Non-fullerene acceptors (NFAs) can be easily synthesized in high yields and their energy levels, UV-vis absorption, and the film morphology can be adjusted. In these organic solar cells, physical properties can be changed through various molecular structural modifications. Among them, we study on alkyl-side-chain-engineering. We report the synthesis and characterization of the bulky-alkyl side chains. In this study, we investigated how these bulky side chains influence solubility, self-assembly, charge mobility, molecular packing and the structure property relationship of the acceptors.