Several new donor-acceptor copolymers based on thiazolothiazole and various donor moieties (dithienopyrrole, cyclopentadithiophene, carbazole, vinylene and bithiophene) were synthesized, characterized and used in field-effect transistors and solar cells.  The series of polythiazolothiazoles with donor-acceptor architecture have optical band gaps of 1.73-2.22 eV, and have a HOMO energy level that varied from -4.91 eV in PPEHTT to -5.46 eV in PBEHTT. X-ray diffraction of the some of the polythiazolothiazole films showed a lamellar crystalline structure with an interlayer d-spacing of 1.45-1.56 nm.  Field-effect transistors fabricated from TT-based polymer semiconductors showed typical p-characteristics with hole mobilities up to 0.03 cm2/Vs with high on/off current ratios (>105). Bulk heterojunction solar cells made from some of the thiazolothiazole-based copolymers gave power conversion efficiencies of up to 3-5% under 100 mW/cm2 AM1.5 sunlight illumination in air.

Thiazolothiazole-based copolymer semiconductors for thin film transistors and solar cells

243rd National Meeting (2012)

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