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学術論文

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

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Walla, P. J.
Research Group of Biomolecular Spectroscopy and Single-Molecule Detection, MPI for biophysical chemistry, Max Planck Society;

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引用

Pieper, A., Hohgardt, M., Willich, M., Gacek, D. A., Hafi, N., Pfennig, D., Albrecht, A., & Walla, P. J. (2018). Biomimetic light-harvesting funnels for re-directioning of diffuse light. Nature Communications, 9(1):. doi:10.1038/s41467-018-03103-4.

要旨

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.