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Biomimetic light-harvesting funnels for re-directioning of diffuse light. | LitMetric

Biomimetic light-harvesting funnels for re-directioning of diffuse light.

Nat Commun

Department for Biophysical Chemistry, Institute for Physical and Theoretical Chemistry, University of Braunschweig, Gaussstrasse 17, 38106, Braunschweig, Germany.

Published: February 2018

AI Article Synopsis

Article Abstract

Efficient sunlight harvesting and re-directioning onto small areas has great potential for more widespread use of precious high-performance photovoltaics but so far intrinsic solar concentrator loss mechanisms outweighed the benefits. Here we present an antenna concept allowing high light absorption without high reabsorption or escape-cone losses. An excess of randomly oriented pigments collects light from any direction and funnels the energy to individual acceptors all having identical orientations and emitting ~90% of photons into angles suitable for total internal reflection waveguiding to desired energy converters (funneling diffuse-light re-directioning, FunDiLight). This is achieved using distinct molecules that align efficiently within stretched polymers together with others staying randomly orientated. Emission quantum efficiencies can be >80% and single-foil reabsorption <0.5%. Efficient donor-pool energy funneling, dipole re-orientation, and ~1.5-2 nm nearest donor-acceptor transfer occurs within hundreds to ~20 ps. Single-molecule 3D-polarization experiments confirm nearly parallel emitters. Stacked pigment selection may allow coverage of the entire solar spectrum.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5812990PMC
http://dx.doi.org/10.1038/s41467-018-03103-4DOI Listing

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