Fluorine substitution influence on benzo[2,1,3]thiodiazole based polymers for field-effect transistor applications
AssigneeThe Regents of the University of California
InventorsMing Wang, Guillermo C. Bazan
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Abstract
Four conjugated copolymers with a donor/acceptor architecture including 4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b′]dithiophene as the donor structural unit and benzo[2,1,3]thiodiazole fragments with varying degrees of fluorination have been synthesized and characterized. It has been shown that the HOMO levels were decreased after the fluorine substitution. The field-effect charge carrier mobility was similar for all polymers with less than an order of magnitude difference between different acceptor units.
Claims21
A composition of matter, comprising a monomer of the structure:
- wherein each R is independently hydrogen or a substituted or non-substituted alkyl, aryl or alkoxy chain.
A composition of matter, comprising a polymer having the following structure:
- wherein:
- each Ar2 is independently a substituted or non-substituted aromatic functional group containing one, two, three or more aromatic rings, or Ar2 is independently nothing and the valence of the ring comprising fluorine (F) is completed with hydrogen,
- each Ar1 is independently a substituted or non-substituted aromatic functional group, or each Ar1 is independently nothing and the valence of its respective thiophene ring is completed with hydrogen,
- each R is independently hydrogen or a substituted or non-substituted alkyl, aryl or alkoxy chain;
- n is an integer;
- and
- EC is an end capping moiety.
A method of fabricating a composition of matter, comprising:
- performing a coupling reaction wherein:
- a first compound and a second compound are coupled in a solution to form a product, using an excess amount of the second compound as compared to the first compound, and
- the first compound comprises a dithiophene and the second compound has the structure:
- and
- purifying the product in a solvent mixture to obtain a third compound having the structure (M2):
Dependencies are inferred from the claim text.