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We measure the homogeneous excitation linewidth of regioregularpoly(3-hexylthiophene), a model semicrystalline polymeric semiconductor, bymeans of two-dimensional coherent photoluminescence excitation spectroscopy. Ata temperature of 8\,K, we find a linewidth that is always $\gtrsim 110$\,meVfull-width-at-half-maximum, which is a significant fraction of the totallinewidth. It displays a spectral dependence and is minimum near the 0--0origin peak. We interpret this spectral dependence of the homogeneousexcitation linewidth within the context of a weakly coupled aggregate model.

Excitonic coupling dominates the homogeneous photoluminescence excitation linewidth in semicrystalline polymeric semiconductors