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Self-assembled aggregates of pigment molecules are potential building blocksfor excitonic circuits that find their application in energy conversion andoptical signal processing. Recent experimental studies of one-dimensionalheterotriangulene supramolecular aggregates suggested that singlet excitons inthese structures can propagate on several micron distances. We explore thispossibility theoretically by combining electronic structure calculations withmicroscopic models for exciton transport. Detailed characterization of thestructural disorder and exciton decoherence is provided. We argue thatconventional exciton transport models give about an order of magnitude shorterestimates for the exciton propagation length which suggest that there are otherpossible explanations of the experimental results.

On the Long-Range Exciton Transport in H-Aggregated Heterotriangulene Chains