Two-Dimensional Electronic Excitations in Self-Assembled Conjugated Polymer Nanocrystals

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Science  04 Feb 2000:
Vol. 287, Issue 5454, pp. 839-842
DOI: 10.1126/science.287.5454.839

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Several spectroscopic methods were applied to study the characteristic properties of the electronic excitations in thin films of regioregular and regiorandom polythiophene polymers. In the regioregular polymers, which form two-dimensional lamellar structures, increased interchain coupling strongly influences the traditional one-dimensional electronic properties of the polymer chains. The photogenerated charge excitations (polarons) show two-dimensional delocalization that results in a relatively small polaronic energy, multiple absorption bands in the gap where the lowest energy band becomes dominant, and associated infrared active vibrations with reverse absorption bands caused by electron-vibration interferences. The relatively weak absorption bands of the delocalized polaron in the visible and near-infrared spectral ranges may help to achieve laser action in nanocrystalline polymer devices using current injection.

  • * On leave from the Department of Physics and the Graduate School of Materials Research, Åbo Akademi University, Porthansgatan 3, FIN-20500 Turku, Finland.

  • To whom correspondence should be addressed. E-mail: val{at}

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