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An artificial light-harvesting array constructed from multiple Bodipy dyes.

Raymond Ziessel¹, Gilles Ulrich, Alexandre Haefele

¹Laboratoire de Chimie Organique et Spectroscopies Avancées (ICPEES-LCOSA), UMR 7515 au CNRS, Ecole Européenne de Chimie, Polymères et Matériaux, Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France. ziessel@unistra.fr

Journal of the American Chemical Society

|July 19, 2013

Summary

Researchers created a molecular funnel using 21 chromophores to direct light energy. This artificial light-harvesting array efficiently captures and funnels photons, showing potential for solar cell applications.

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Area of Science:

Supramolecular Chemistry
Photochemistry
Materials Science

Background:

Artificial light-harvesting systems aim to mimic natural photosynthesis for efficient energy capture and transfer.
Molecular arrays offer precise control over chromophore arrangement for directed energy flow.

Purpose of the Study:

To synthesize and characterize a novel artificial light-harvesting array with a molecular-scale funnel structure.
To investigate the energy transfer dynamics within the array, focusing on directed energy flow and potential energy barriers.

Main Methods:

Convergent synthesis of a V-shaped array comprising 21 discrete chromophores.
Characterization of the array's structure and photophysical properties.
Analysis of electronic energy transfer cascades and exciton dynamics.

Main Results:

A molecular funnel array with high effective chromophore concentration (0.6 M) in a small volume (55 nm3) was successfully synthesized.
A cascade of energy transfer steps was observed, with slowing rates towards the focal point.
The array exhibits a 'holding pattern' effect, allowing photons to sample multiple chromophores before reaching the acceptor, and encountered energy barriers at high flux.

Conclusions:

The synthesized array effectively directs excitation energy to a focal point, demonstrating a molecular-scale light-harvesting system.
The observed energy transfer dynamics, including reverse transfer and energy barriers, offer insights into controlling exciton behavior.
The array shows promise as a sensitizer for amorphous silicon solar cells, paving the way for advanced photovoltaic applications.