Thermal effects in exciton harvesting in biased one-dimensional systems
arXiv:0710.2511 · doi:10.1016/j.jlumin.2007.11.038
Abstract
The study of energy harvesting in chain-like structures is important due to its relevance to a variety of interesting physical systems. Harvesting is understood as the combination of exciton transport through intra-band exciton relaxation (via scattering on phonon modes) and subsequent quenching by a trap. Previously, we have shown that in the low temperature limit different harvesting scenarios as a function of the applied bias strength (slope of the energy gradient towards the trap) are possible \cite{Vlaming07}. This paper generalizes the results for both homogeneous and disordered chains to nonzero temperatures. We show that thermal effects are appreciable only for low bias strengths, particularly so in disordered systems, and lead to faster harvesting.
8 pages, 2 fugures, to appear in Journal of Luminescence
References in corpus (4)
- Temperature dependent fluorescence in disordered Frenkel chains: interplay of equilibration and local band-edge level structure
- Low-temperature dynamics of weakly localized Frenkel excitons in disordered linar chains
- Low-temperature quenching of one-dimensional localised Frenkel excitons
- Nonmonotonic energy harvesting efficiency in biased exciton chains