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Thienopyrazine‐Based Low‐Bandgap Poly(heteroaryleneethynylene)s for Photovoltaic Devices
Author(s) -
Ashraf Raja Shahid,
Shahid Munazza,
Klemm Elisabeth,
AlIbrahim Maher,
Sensfuss Steffi
Publication year - 2006
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200600314
Subject(s) - materials science , polymer , band gap , condensation polymer , phenylene , conjugated system , thiophene , copolymer , thin film , polymer chemistry , optoelectronics , alkoxy group , chemical engineering , alkyl , organic chemistry , nanotechnology , composite material , chemistry , engineering
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 I SC = 10.72 mA · cm −2 , an open circuit voltage of V oc = 0.67 V, and a power conversion efficiency of 2.37%.Schematic of the photovoltaic device made from the polymers synthesized here.
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