Thienopyrazine-Based Low-Bandgap Poly(heteroaryleneethynylene)s for Photovoltaic Devices

Low‐bandgap π‐conjugated polymers that consist of alkyl thiophene/alkoxy phenylene and 2,3‐diphenylthieno[3,4‐b]pyrazine units have been prepared in high yields by a Sonogashira polycondensation. The copolymers are characterized by NMR, IR, UV, GPC, and elemental analysis. Thin films of the polymers...

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Bibliographic Details
Published in:Macromolecular rapid communications. 2006-09, Vol.27 (17), p.1454-1459
Main Authors: Ashraf, Raja Shahid, Shahid, Munazza, Klemm, Elisabeth, Al-Ibrahim, Maher, Sensfuss, Steffi
Format: Article
Language:English
Subjects:
Applied sciences
conjugated polymers
Energy
Exact sciences and technology
low bandgap polymers
Natural energy
Organic polymers
organic solar cells
photophysics
Photovoltaic conversion
Physicochemistry of polymers
Polymers with particular properties
Preparation, kinetics, thermodynamics, mechanism and catalysts
Solar cells. Photoelectrochemical cells
Solar energy
thienopyrazine
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Summary:Low‐bandgap π‐conjugated polymers that consist of alkyl thiophene/alkoxy phenylene and 2,3‐diphenylthieno[3,4‐b]pyrazine units have been prepared in high yields by a Sonogashira polycondensation. The copolymers are characterized by NMR, IR, UV, GPC, and elemental analysis. Thin films of the polymers P1, P2, and P3 exhibit an optical bandgap of ≈1.57–1.60 eV. Under simulated AM 1.5 conditions P2/PCBM devices on polyester foil provide a short circuit current of ISC = 10.72 mA · cm−2, an open circuit voltage of Voc = 0.67 V, and a power conversion efficiency of 2.37%. Schematic of the photovoltaic device made from the polymers synthesized here.
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.200600314