Fullerene-capped copolymers for bulk heterojunctions: device stability and efficiency improvements

Abstract : A fullerene end-capped polymer-compatibilizer based on poly(3-hexylthiophene) (P3HT) was synthesized and demonstrated to have a remarkable effect on both the stability and efficiency of devices made from exemplar P3HT and [6,6]-phenyl C-61-butyric acid methyl ester (PCBM). P3HT with ethynyl chain-ends and alpha-azido-omega-bromo-PS were prepared via Grignard metathesis (GRIM) and atom transfer radical polymerisation, respectively. "Click" chemistry resulted in the preparation of poly(3-hexylthiophene)block- omega-bromo-polystyrene (P3HT-b-PS-Br), and subsequent atom transfer radical addition chemistry with fullerene (C-60) yielded the donor-acceptor block copolymer P3HT-b-PS-C-60. Both P3HT-b-PS-Br and P3HT-b-PS-C-60 were considered as compatibilizers with P3HT/PCBM blends, with the study detailing effects on active-layer morphology, device efficiency and stability. When used at low concentrations, both P3HT-b-PS-Br (1%) and P3HT-b-PS-C-60 (0.5%) resulted in considerable 28% and 35% increases in efficiencies with respect to devices made from P3HT/PCBM alone. Furthermore, P3HT-b-PS-C-60 (0.5%) resulted in an important improvement in device stability.
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Submitted on : Wednesday, September 14, 2016 - 10:07:54 AM
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Mahfoudh Raïssi, Harikrishna Erothu, Emmanuel Ibarboure, Henri Cramail, Laurence Vignau, et al.. Fullerene-capped copolymers for bulk heterojunctions: device stability and efficiency improvements . Journal of Materials Chemistry. A, Royal Society of Chemistry, 2015, 3 (35), pp.18207-18221. ⟨10.1039/c5ta02705e ⟩. ⟨hal-01366070⟩

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