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

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 i...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2000-02, Vol.287 (5454), p.839-842
Main Authors: Österbacka, R., An, C. P., Jiang, X. M., Vardeny, Z. V.
Format: Article
Language:English
Subjects:
Absorption spectra
Applied sciences
Electrical, magnetic and optical properties
Electrons
Exact sciences and technology
Excitons
Glacial landforms
Lasers
Material films
Mobility
Nanocrystals
Organic polymers
Photoexcitation
Physicochemistry of polymers
Physics
Polarons
Polymers
Properties and characterization
Scientific Concepts
Scientific imaging
Semiconductors
Silicones
Spectra
Spectral bands
Spectroscopy
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Summary: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.287.5454.839