Unraveling the Inhomogeneously Broadened Absorption Spectrum of Conjugated Polymers by Single-Molecule Light-Harvesting Action Spectroscopy

Manfred J. Walter and John M. Lupton
Phys. Rev. Lett. 103, 167401 – Published 12 October 2009
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Abstract

The distribution of chromophores in single polymer chains is revealed by photoluminescence excitation spectroscopy under excitation of the backbone and detection of emission from an end cap. Spectral broadening in excitation exceeds that in emission. An increase in vibronic coupling for shorter (higher energy) chromophores is resolved, leading to intrinsic spectral broadening and making higher energy units more effective donors. The results suggest routes to increasing absorption breadth while minimizing disorder as required for efficient photovoltaics.

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  • Received 15 May 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.167401

©2009 American Physical Society

Authors & Affiliations

Manfred J. Walter and John M. Lupton

  • Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA

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Vol. 103, Iss. 16 — 16 October 2009

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