New Thienothiadiazole-Based Conjugated Copolymers for Electronics and Optoelectronics

Four new donor–acceptor conjugated copolymers incorporating thieno[3,4-c][1,2,5]thiadiazole as the acceptor moiety and various electron donor moieties were synthesized and their electronic structures and properties were investigated. The new thienothiadiazole copolymers obtained by Stille coupling p...

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Bibliographic Details
Published in:Macromolecules 2012-05, Vol.45 (9), p.3732-3739
Main Authors: Hwang, Ye-Jin, Kim, Felix Sunjoo, Xin, Hao, Jenekhe, Samson A
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Exact sciences and technology
Natural energy
Organic polymers
Photovoltaic conversion
Physicochemistry of polymers
Polymers with particular properties
Preparation, kinetics, thermodynamics, mechanism and catalysts
Solar cells. Photoelectrochemical cells
Solar energy
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Summary:Four new donor–acceptor conjugated copolymers incorporating thieno[3,4-c][1,2,5]thiadiazole as the acceptor moiety and various electron donor moieties were synthesized and their electronic structures and properties were investigated. The new thienothiadiazole copolymers obtained by Stille coupling polymerizations had weight-average molecular weights of 10–46 kDa. Their broad absorption bands and optical band gaps of 0.9–1.2 eV demonstrate strong intramolecular charge transfer and potential for extending light harvesting deep into the near-infrared. The HOMO/LUMO energy levels were 4.9–5.1/3.4–3.6 eV (below vacuum). As p-channel semiconductors in field-effect transistors, the thienothiadiazole copolymers had a carrier mobility of up to 4.6 × 10–3 cm2/(Vs). Bulk heterojunction solar cells made from blends of the thienothiadiazole copolymers with fullerenes gave a photovoltaic efficiency of 0.4%.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma3000797