This observation is consistent with temperature-dependent UV-Vis results discussed above (Figure ). In contrast, in decane solution, the high-q structure factor peak is absent (Figure ), indicating the absence of ordered lamellar packing as the side chains are well solubilized by solvent molecules. A side chain solvent like decane may result in strong π-stacking of the backbone as it only has affinity towards the side chain, resulting in the formation of micronsized agglomerates . In mutual solvent DCB, the side chain association is still present but is not as ordered as in CN evidenced by a much broader lamellar peak with a FWHM equal to 0.18 Å -1 . This suggests a moderate solvent quality for solubilizing the side chain, which together with its moderate affinity towards the backbone makes DCB sit in between the two extremes of decane and CN. Such mutual solvents balance backbone and side chain interactions and lead to much smaller nanofiber aggregates at room temperature shown earlier.