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How do Disorder, Reorganization and Localization Influence the Hole Mobility in Conjugated Co-polymers?
MedLine Citation:
PMID:  23297679     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
In order to unravel the intricate interplay between disorder effects, molecular reorganization and charge carrier localization, a comprehensive study was conducted on hole transport in a series of conjugated alternating phenanthrene indenofluorene co-polymers. Each polymer in the series contained one further co-monomer comprising monoamines, diamines or amine-free structures, whose influence on the electronic, optical and charge transport properties was studied. The series covered a wide range of HOMO energies as determined by cyclovoltammetry. The mobility, inferred from time-of-flight (ToF) experiments as a function of temperature and electric field, was found to depend exponentially on the HOMO energy. Since possible origins for this effect include energetic disorder, polaronic effects and wavefunction localization, the relevant parameters were determined using a range of methods. Disorder and molecular reorganization were established by, first, an analysis of absorption and emission measurements and, second, by an analysis of the ToF measurements. In addition, DFT calculations were carried out to determine how localized or delocalized holes on a polymer chain are and to compare calculated reorganization energies with those that have been inferred from optical spectra. In summary, we conclude that molecular reorganization has little effect on the hole mobility in this system while both disorder effects and hole localization in systems with low-lying HOMO are predominant. In particular, as the energetic disorder is comparable for the co-polymers, the absolute value of the hole mobility at room temperature is determined by the hole localization associated with the triarylamine moieties.
Authors:
Sebastian Tim Hoffmann; Frank Jaiser; Anna Hayer; Heinz Baessler; Thomas Unger; Stavros Athanasopoulos; Dieter Neher; Anna Köhler
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-9
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  -     ISSN:  1520-5126     ISO Abbreviation:  J. Am. Chem. Soc.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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