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Synthesis and characterization of a low band gap polymer based on cyclopentadithiophene and thieno[3,4-b]thiophene

ABSTRACT A low band gap polymer based on thieno[3,4-b]thiophene (TT) and cyclopentadithiophene (CPDT), named as P-TT, was synthesized through palladium-catalyzed Stille coupling reaction. Due to the strong electron-donating property of CPDT and quinoidal structural TT, P-TT exhibited narrow band gap (1.30 eV). Optical and thermal properties of P-TT had been investigated.