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- Title
Synthesis and photovoltaic device studies of azo-linked low-bandgap polymers.
- Authors
Meena, Savita; Alam, Firoz; Dutta, Viresh; Jacob, Josemon
- Abstract
We report the synthesis of a series of new polymers containing azo linkage as a part of the main chain. The monomer 1,2-bis(7-bromo-9,9-dioctyl-9 H-fluoren-2-yl)diazene was synthesized using a precursor approach which avoids non-selective bromination and was copolymerized with various donor or acceptor units. The homopolymer poly[1,2-bis(9,9-dioctyl-9 H-fluoren-2-yl)diazene] ( P1) as well as the copolymers poly[1-(9,9-dioctyl-9 H-fluoren-2-yl)-2-(9,9,9′,9′-tetraoctyl-9 H,9′ H-[2,2′-bifluoren]-7-yl)diazene] ( P2), poly[1-(9,9-dioctyl-7-(4-octylthiophen-2-yl)-9 H-fluoren-2-yl)-2-(9,9-dioctyl-9 H-fluoren-2-yl)diazene] ( P3) and poly[4-(7-((9,9-dioctyl-9 H-fluoren-2-yl)diazenyl)-9,9-dioctyl-9 H-fluoren-2-yl)benzo[ c][1,2,5]thiadiazole] ( P4) were synthesized by Suzuki polymerization. The copolymers poly[1-(7-(4,4-dioctyl-4 H-cyclopenta[1,2- b:5,4- b′]dithiophen-2-yl)-9,9-dioctyl-9 H-fluoren-2-yl)-2-(9,9-dioctyl-9 H-fluoren-2-yl)diazene] ( P5) and poly[4-(5-(7-((9,9-dioctyl-9 H-fluoren-2-yl)diazenyl)-9,9-dioctyl-9 H-fluoren-2-yl)-4-octylthiophen-2-yl)-7-(4-octylthiophen-2-yl)benzo[ c][1,2,5]thiadiazole] ( P6) were synthesized by direct arylation polymerization reaction. Polymers synthesized using the direct arylation method show good molecular weight, with absorption maxima in the range 500 to 532 nm. P5 and P6 possess low optical bandgaps of 1.81 and 1.86 eV, respectively. A power conversion efficiency of 0.53% with open circuit voltage of 0.53 V, short circuit current density of 3.1 mA cm−2 and fill factor of 29% has been achieved with C71-PCBM as acceptor in bulk heterojunction solar cells fabricated with P5 as donor. © 2016 Society of Chemical Industry
- Subjects
PHOTOVOLTAIC power systems; PHOTONIC band gap structures; PHOSPHINE synthesis; METHACRYLATES; POLYHYDROXYALKANOATES synthesis; POLYETHYLENE glycol
- Publication
Polymer International, 2017, Vol 66, Issue 4, p593
- ISSN
0959-8103
- Publication type
Article
- DOI
10.1002/pi.5299