TY - JOUR
T1 - Pendant group effects on the optical and electrical properties of carbazole-diketopyrrolopyrrole copolymers
AU - Kwon, Obum
AU - Jo, Jang
AU - Walker, Bright
AU - Bazan, Guillermo C.
AU - Seo, Jung Hwa
PY - 2013/6/28
Y1 - 2013/6/28
N2 - 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 × 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.
AB - 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 × 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.
UR - http://www.scopus.com/inward/record.url?scp=84878743159&partnerID=8YFLogxK
U2 - 10.1039/c3ta11058c
DO - 10.1039/c3ta11058c
M3 - Article
AN - SCOPUS:84878743159
SN - 2050-7488
VL - 1
SP - 7118
EP - 7124
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 24
ER -