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 comprising 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. Methods of increasing yield of the copolymers, controlling molecular weight of the copolymers, and endcapping the copolymers are also described.
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:
- Ar is a substituted or non-substituted aromatic functional group containing one, two, three or more aromatic rings, or Ar is nothing and the valence of the ring comprising fluorine (F) is completed with hydrogen,
- each Ar is independently a substituted or non-substituted aromatic functional group, or each Ar is independently nothing and the valence of its respective 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.