Pendant group effects on the optical and electrical properties of carbazole-diketopyrrolopyrrole copolymers
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- Pendant group effects on the optical and electrical properties of carbazole-diketopyrrolopyrrole copolymers
- Kwon, Obum; Jo, Jang; Walker, Bright; Bazan, Guillermo C.; Seo, Jung Hwa
- Backbone structures; Conjugated copolymers; Device performance; Diketopyrrolopyrroles; Optical and electrical properties; Pendant groups; Pendent groups; Suzuki cross coupling reactions
- Issue Date
- ROYAL SOCIETY OF CHEMISTRY
- JOURNAL OF MATERIALS CHEMISTRY A, v.1, no.24, pp.7118 - 7124
- Two kinds of novel carbazole and diketopyrrolopyrrole based conjugated copolymers, poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(3,6-dithien-2-yl-2,5-bis(2-ethylhexyl)pyrrolo[3,4-c]pyrrole-1,4-dione)] (P1) and poly[N-9'-(3,5-bis(octyloxy) phenyl)-2,7-carbazole-alt-5,5-(3,6-dithien-2-yl-2,5-bis(2-ethylhexyl)pyrrolo[3,4-c] pyrrole-1,4-dione)] (P2), were synthesized via a Suzuki cross coupling reaction. The optical and electrical properties of these polymers, in which the pendent groups on the carbazole moiety were modified, were investigated. Aryl substituted P2 shows a narrower band gap (1.61 eV), higher hole mobility (4.4 x 10(-3) cm(2) V-1 s(-1)) and more planar backbone structure than alkyl substituted P1. The modification of side groups significantly affected their surface morphologies. The device performance of solar cells based on these polymers and a fullerene acceptor was characterized.
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