Two-dimensional electronic excitations in self-assembled conjugated polymer nanocrystals

R. Österbacka, C. P. An, X. M. Jiang, Z. V. Vardeny*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

595 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)839-842
Number of pages4
JournalScience
Volume287
Issue number5454
DOIs
Publication statusPublished - 4 Feb 2000
MoE publication typeA1 Journal article-refereed

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