Patent ID: 7981323

Claim:
A composition of matter comprising: a semiconducting copolymer doped with a polymeric acid of sufficient strength to form colloids, the copolymer containing a repeating unit having formula: wherein X is Se, Y is S, R is a substituent group, n and m are independently selected integers having a total n+m of greater than or equal to 2, and Mo includes thieno[3,4-b]thiophene, thieno[3,2-b]thiophene, substituted thieno[3,4-b]thiophenes, substituted thieno[3,2-b]thiophene, dithieno[3,4-b:3′,4′-d]thiophene, bithiophene, phenylene, substituted phenylenes, naphthalene, substituted naphthalenes, biphenyl, terphenyl, or substituted terphenyl; and a solvent or water.