Exciton diffusion measurements in poly(3-hexylthiophene)

Shaw, PE, Ruseckas, A and Samuel, IDW (2008) Exciton diffusion measurements in poly(3-hexylthiophene). Advanced Materials, 20 18: 3516-3520. doi:10.1002/adma.200800982


Author Shaw, PE
Ruseckas, A
Samuel, IDW
Title Exciton diffusion measurements in poly(3-hexylthiophene)
Journal name Advanced Materials   Check publisher's open access policy
ISSN 0935-9648
1521-4095
Publication date 2008-09-17
Year available 2008
Sub-type Article (original research)
DOI 10.1002/adma.200800982
Open Access Status Not yet assessed
Volume 20
Issue 18
Start page 3516
End page 3520
Total pages 5
Place of publication Weinheim, Germany
Publisher Wiley
Language eng
Abstract The problem of making reliable measurements of exciton diffusion lengths in organic semiconductors is addressed. The exciton diffusion length is an extremely important quantity in the operation of organic solar cells. We focus on the polymer P3HT because of its widespread use in solar cells and are able to fit the exciton diffusion in a range of films with a single diffusion constant, showing that our approach is particularly robust.
Formatted abstract
Time-resolved exciton diffusion measurements of fluorescence coupled with a TiO2 quencher, in poly(3-hexylthiophene) (P3HT), was described. Ellipsometry was performed on P3HT films over a range of thicknesses and the data used to construct a uniaxial model from which the absorption as a function of film thickness was calculated. The PL decays show that, over all four thicknesses there is a clear trend with the P3HT on TiO2 decaying faster than its fused silica counterparts. Ultrafast electron transfer to TiO2 is demonstrated from MEH-PPV and a thiophene oligomer, supporting the use of an infinite quencher in the proposed model. Internal conversion to the lowest state is found to be the dominant relaxation pathway of the higher energy exciton in a polythiophene derivative.
Keyword Exciton diffusion
Exciton–exciton annihilation
Polymer solar cells
Titanium dioxide
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemistry and Molecular Biosciences
 
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Created: Tue, 24 May 2011, 23:49:29 EST by Dr Paul Shaw on behalf of School of Chemistry & Molecular Biosciences