Regioregular pyridal[2,1,3]thiadiazole π-conjugated copolymers for organic semiconductors

An field-effect transistor (FET) device including a regioregular donor-acceptor copolymer comprising a regioregular conjugated main chain section, said regioregular conjugated main chain section having a repeat unit that comprises a pyridine of the structure

• wherein:
• Ar is a substituted or non-substituted aromatic functional group;
• the pyridine is regioregularly arranged along the conjugated main chain section;
• the repeat unit further comprises a dithiophene of the structure
• wherein each Ar is independently a substituted or non-substituted aromatic functional group, or each Ar 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;
• and
• X is C, Si, Ge, N or P;
• the regioregular donor-acceptor copolymer forms an active semiconducting layer in the field-effect transistor device;
• and
• the charge carrier mobility of the regioregular donor-acceptor copolymer is greater than the charge carrier mobility of a regiorandom donor-acceptor copolymer of similar composition.

A regioregular donor-acceptor copolymer comprising a regioregular conjugated main chain section, said regioregular conjugated main chain section having a repeat unit that comprises a pyridine of the structure

• wherein:
• Ar is a substituted or non-substituted aromatic functional group;
• the pyridine is regioregularly arranged along the conjugated main chain section;
• and
• the repeat unit further comprises a dithiophene of the structure
• wherein:
• R is independently hydrogen or a substituted or non-substituted alkyl, aryl or alkoxy chain;
• and X is C, Si, Ge, N or P;
• and
• the charge carrier mobility of the regioregular donor-acceptor copolymer is greater than the charge carrier mobility of a regiorandom donor-acceptor copolymer of similar composition.