Abstract: A method of reacting bis(R1) 5,5??-dibromo-3?,4?-difluoro-[2,2?:5?,2?:5?,2??-quaterthiophene]-3,3??-dicarboxylate and bis(R2) 5,5??-dibromo-3?,4?-difluoro-[2,2?:5?,2?:5?,2??-quaterthiophene]-3,3??-dicarboxylate to form the polymer: In this polymer R1, R2, R3, R4, R5 and R6 are independently selected from the group consisting of: a halogen, a substituted alkyl, an unsubstituted alkyl, a substituted aryl, an unsubstituted aryl, a substituted heteroaryl and an unsubstituted heteroaryl.

Abstract: A copolymer comprising a repeat unit A, wherein repeat unit A comprises a repeat unit B, wherein repeat unit B comprises and at least one optional repeat unit D, wherein repeat unit D comprises an aryl group. In this copolymer, X1, X2, X3, and X4 are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, ester, ketone, amide and aryl groups and R1, R2, R3, R4, R5 and R6 are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups.

Abstract: A polymer comprising wherein Ar1 and Ar2 are optional and either the same or different and independently selected from an aryl group or an heteroaryl group. In this polymer, W is selected from the group consisting of: S, Se, O, and N-Q; and Q is selected from the group consisting of: a straight-chain or branched carbyl, silyl, or hydrocarbyl, a branched or cyclic alkyl with 1 to 30 atoms, a fused substituted aromatic ring, and a fused unsubstituted aromatic ring. Additionally, in the polymer, R1 is selected from the group consisting of: a straight-chain or branched carbyl, silyl, or hydrocarbyl, a branched or cyclic alkyl with 1 to 30 atoms, a fused substituted aromatic ring, and a fused unsubstituted aromatic ring and wherein x+y=1.

Abstract: A method of forming a polymer, the method comprising combining 4-bromo-7-[5-bromo-4-(alkyl)thiophen-2-yl]-6-chloro-5-fluoro-2,1,3-benzothiadiazole, (3,3?-difluoro-[2,2?-bithiophene]-5,5?-diyl)bis(trimethylstannane), [4-(alkyl)-5-[5-(trimethylstannyl)thiophen-2-yl]thiophen-2-yl]trimethylstannane, tris(dibenzylideneacetone), and dipalladium P(o-tol)3 tris(2-methylphenyl)phosphane to form the polymer: In this polymer, W is selected from the group consisting of: S, Se, O, and N-Q. Additionally, Q is selected from the group consisting of: a straight-chain carbyl, silyl or hydrocarbyl, branched, cyclic alkyl with 1 to 30 atoms, and fused aromatic rings.

Abstract: A method of forming a polymer, the method comprising combining 4,7-bis(5-bromo-4-alkyl thiophen-2-yl)-5-chloro-6-fluorobenzo[c][1,2,5]thiadiazole, (3,3?-difluoro-[2,2?-bithiophene]-5,5?-diyl)bis(trimethylstannane), and benzo[1,2-b:4,5-b?]dithiophene-2,6-diyl)bis(trimethylstannane), Pd2dba3 and P(o-tol)3 to form the polymer: In this polymer, W is selected from the group consisting of: S, Se, O, and N-Q. Additionally, in this polymer Q is selected from the group consisting of: a straight-chain or branched carbyl, silyl, or hydrocarbyl, a branched or cyclic alkyl with 1 to 30 atoms, a fused substituted aromatic ring, and a fused unsubstituted aromatic ring.

Abstract: A method of forming a polymer, the method begins by combining 4,7-bis(5-bromo-4-alkylthiophen-2-yl)-5-chloro-6-fluorobenzo[c][1,2,5]thiadiazole, [4-alkyl-5-[5-(trimethylstannyl)thiophen-2-yl]thiophen-2-yl]trimethylstannane, (3,3?-difluoro-[2,2?-bithiophene]-5,5?-diyl)bis(trimethylstannane), Pd2dba3 and P(o-tol)3 to form the polymer: In this polymer R1 and R2 are independently selected from the group consisting of a straight-chain or branched carbyl, silyl, or hydrocarbyl, a branched or cyclic alkyl with 1 to 30 atoms, a fused substituted aromatic ring, and a fused unsubstituted aromatic ring; and the ratio of x is between 0.6 to 0.8 and y is between 0.2 and 0.4.

Abstract: A random copolymer comprising the monomer unit C and at least two out of the three monomer units A, B, and D. In the random copolymer A comprises B comprises D comprises and C comprises an aryl group. Additionally, R1 R2, R3, R4, R3?, and R4? are side chains independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups and wherein R3 and R3? or R4 and R4? are not equal.

Abstract: A novel AB-type copolymer for use in organic photovoltaics. The AB-type copolymer comprises a unit A, where the unit A is where R1 is a carbon chain from about 1 to about 30 units and where Y is selected from CN, F and Cl. The B unit of the AB-type copolymer is selected from is selected from: wherein X1, X2, X3, and X4 are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkylthiol, alkoxy, ester, ketone, amide and aryl groups.

Abstract: A random copolymer comprising the monomer units A, B and C. In this random copolymer A comprises B comprises and C comprises an aryl group. Additionally, R1 R2, R3 and R4 are side chains independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups. X1 and X2 are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, ester, ketone, amide and aryl groups.

Abstract: A random copolymer comprising the monomer units A and B. In this random copolymer A comprises and aryl group and B comprises Additionally, R3 is a side chain independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups.

Abstract: A random copolymer comprising the monomer units A and B. In this random copolymer A comprises and B comprises Additionally, R1 R2, R3 and R4 are side chains independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups. X1 and X2 are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, ester, ketone, amide and aryl groups.

Abstract: A random copolymer comprising the monomer units A and B. In this random copolymer A comprises and B comprises Additionally, R1 R2, R3 and R4 are side chains independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups. X1 and X2 are different and at least one is a Cl and the other is selected from the group consisting of: H, F, CN, alkyl, alkoxy, ester, ketone, amide and aryl groups.

Abstract: A random copolymer comprising the monomer units A, B and C. In this random copolymer A comprises B comprises and C comprises an aryl group. Additionally, R1 R2, R3 and R4 are side chains independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups. X1 and X2 are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, ester, ketone, amide and aryl groups.

Abstract: A random copolymer comprising the monomer units A, B and C. In this random copolymer A comprises B comprises and C comprises an aryl group. Additionally, R1 R2, R3 and R4 are side chains independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups. X1 and X2 are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, ester, ketone, amide and aryl groups.

Abstract: A random copolymer comprising the monomer units A and B. In this random copolymer A comprises and B comprises an aryl group. Additionally, R1 and R2 are side chains independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups. X1 and X2 are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, ester, ketone, amide and aryl groups.

Abstract: A random copolymer comprising the monomer units A and B. In this random copolymer A comprises and B comprises Additionally, R1 R2, R3 and R4 are side chains independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups. X1 and X2 are identical and selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, ester, ketone, amide and aryl groups.

Abstract: A random copolymer comprising the monomer units A, B and C. In this random copolymer A comprises B comprises and C comprises an aryl group. Additionally, R1 R2, R3 and R4 are side chains independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups. X1 and X2 are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, ester, ketone, amide and aryl groups.

Abstract: An organic photovoltaic device comprising a polymer: and an acceptor. In this organic photovoltaic device, R1, R2, R3, R4, R5 and R6 are independently selected from the group consisting of: a halogen, a substituted alkyl, an unsubstituted alkyl, a substituted aryl, an unsubstituted aryl, a substituted heteroaryl and an unsubstituted heteroaryl.

Abstract: A comonomer comprising: wherein W is selected from the group consisting of: S, Se, O, and N-Q; and Q is selected from the group consisting of: a straight-chain or branched carbyl, silyl, or hydrocarbyl, a branched or cyclic alkyl with 1 to 30 atoms, a fused substituted aromatic ring, and a fused unsubstituted aromatic ring. In this comonomer, A and B are independently selected from the group consisting of: H, Br, an aryl group, and a heteroaryl group.

Abstract: A method of forming a polymer, the method comprising combining 4-bromo-7-[5-bromo-4-(alkyl)thiophen-2-yl]-6-chloro-5-fluoro-2,1,3-benzothiadiazole, (3,3?-difluoro-[2,2?-bithiophene]-5,5?-diyl)bis(trimethylstannane), [4-(alkyl)-5-[5-(trimethylstannyl)thiophen-2-yl]thiophen-2-yl]trimethylstannane, tris(dibenzylideneacetone), and dipalladium P(o-tol)3 tris(2-methylphenyl)phosphane to form the polymer: In this polymer, W is selected from the group consisting of: S, Se, O, and N-Q. Additionally, Q is selected from the group consisting of: a straight-chain carbyl, silyl or hydrocarbyl, branched, cyclic alkyl with 1 to 30 atoms, and fused aromatic rings.