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We present a novel, counter-intuitive method, based on dark state protection,for significantly improving exciton transport efficiency through `wires'comprising a chain of molecular sites with an intrinsic energy gradient.Specifically, by introducing `barriers' to the energy landscape at regularintervals along the transport path, we find that undesirable radiativerecombination processes are suppressed due to a clear separation of sub-radiantand super-radiant eigenstates in the system. This, in turn, can lead to animprovement in transmitted power by many orders of magnitude, even for verylong chains. From there, we analyse the robustness of this phenomenon tochanges in both system and environment properties to show that this effect canbe beneficial over a range of different thermal and optical environmentregimes. Finally, we show that the novel energy landscape presented here mayprovide a useful foundation for overcoming the short length scales over whichexciton diffusion typically occurs in organic photo-voltaics and othernanoscale transport scenarios, thus leading to considerable potentialimprovements in the efficiency of such devices.

journal of chemical physics online/the journal of chemical physics/journal of chemical physics

The dark side of energy transport along excitonic wires: On-site energy  barriers facilitate efficient, vibrationally-mediated transport through  optically dark subspaces