Polymers with tunable band gaps for photonic and electronic applications
The present invention provides, among other things, a copolymer comprising at least one donor monomer and at least one acceptor monomer. The polymer may optionally further comprise at least one additional comonomer. The polymers are useful as a charge-transport, semiconducting, electrochemical conducting, photoconducting, or light emitting material. Microelectronic devices comprising such polymers (e.g., as a heterojunction therein) are also described.
1. A copolymer having the formula:
wherein each R 1 , R 2 R 3 , and R 4 is independently selected from the group consisting of H, C1-C20 alkyl, C1-C20 fluoroalkyl, C1-C20 alkoxy, C1-C20 fluoroalkoxy, halo, aryl, CN and NO 2 ;
R 5 and R 6 are fluoro; and
each R and R 7 is C1-C20 alkyl.
2. The copolymer of claim 1 , having a number average molecular weight for said polymer of from 500 to 1,000,000 grams per mole.
3. A copolymer having the formula:
wherein:
R 1 , R 2 , R 3 and R 4 are each H;
R 5 and R 6 are fluoro; and
R and R 7 are each C1-C20 alkyl.
4. The copolymer of claim 3 having a number average molecular weight of from 500 to 1,000,000 grams per mole.