Pendant group effects on the optical and electrical properties of carbazole-diketopyrrolopyrrole copolymers

被引:26
作者
Kwon, Obum [1 ,5 ]
Jo, Jang [2 ]
Walker, Bright [3 ]
Bazan, Guillermo C. [1 ]
Seo, Jung Hwa [4 ]
机构
[1] Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA
[2] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA
[3] Ulsan Natl Inst Sci & Technol, Dept Interdisciplinary Green Energy, Ulsan 689798, South Korea
[4] Dong A Univ, Dept Mat Phys, Pusan 614070, South Korea
[5] Samsung Cheil Ind Inc, Div Elect Mat, Uiwang 3322, Gyeonggi, South Korea
基金
新加坡国家研究基金会; 美国国家科学基金会;
关键词
POLYMER SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; THIN-FILM TRANSISTORS; BAND-GAP POLYMERS; SIDE-CHAIN; POLY(2,7-CARBAZOLE) DERIVATIVES; CONJUGATED POLYMER; PERFORMANCE; EFFICIENCY; ENHANCEMENT;
D O I
10.1039/c3ta11058c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:7118 / 7124
页数:7
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