Copolymers of perylene diimide with dithienothiophene and dithienopyrrole as electron-transport materials for all-polymer solar cells and field-effect transistors

被引:157
作者
Zhan, Xiaowei [1 ,2 ]
Tan, Zhan'ao [1 ,2 ]
Zhou, Erjun [1 ,2 ]
Li, Yongfang [1 ,2 ]
Misra, Rajneesh [3 ,4 ]
Grant, Adrian [4 ,5 ]
Domercq, Benoit [4 ,5 ]
Zhang, Xiao-Hong [4 ,5 ]
An, Zesheng [3 ,4 ]
Zhang, Xuan [3 ,4 ]
Barlow, Stephen [3 ,4 ]
Kippelen, Bernard [4 ,5 ]
Marder, Seth R. [3 ,4 ]
机构
[1] Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
[2] Chinese Acad Sci, Inst Chem, Key Lab Organ Solids, Beijing 100190, Peoples R China
[3] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA
[4] Georgia Inst Technol, Ctr Organ Photon & Elect, Atlanta, GA 30332 USA
[5] Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA
关键词
DONOR-ACCEPTOR HETEROJUNCTIONS; STACKED ORGANIC SEMICONDUCTOR; CHARGE-CARRIER MOBILITIES; CONJUGATED POLYMER; PHOTOVOLTAIC PROPERTIES; BISIMIDE; BLEND; OLIGOTHIOPHENES; EFFICIENCIES; ABSORPTION;
D O I
10.1039/b907163f
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
Electron-accepting solution-processable conjugated polymers consisting of perylene diimide moieties alternating with dithienothiophene, oligo(dithienothiophene), or N-dodecyl dithienopyrrole units have been synthesized. All these polymers possess excellent thermal stability with decomposition temperatures over 400 degrees C. The glass-transition temperatures vary from 155 to 263 degrees C. These polymers show broad absorption extending from 250 to 900 nm with electrochemical and optical bandgaps as low as 1.4 eV; the maximum absorbance increases and the bandgap decreases with increasing the conjugation length of oligo(dithienothiophene), while the bandgap can also be decreased by the replacement of dithienothiophene by dithienopyrrole. The electrochemical onset reduction potentials range from -0.8 to -1.0 V vs. ferrocenium/ferrocene, suggesting that the electron affinities are essentially unaffected by the specific choice of donor moiety, while the onset oxidation potentials (+0.6 to +1.0 V) are a little more sensitive to the choice of donor. The mono dithienothiophene and the dithienopyrrole polymers were found to exhibit electron mobilities as high as 1.3 x 10(-2) and 1.2 x 10(-3) cm(2)V(-1)s(-1), respectively, in top-contact organic field-effect transistors. Power conversion efficiencies in the range 0.77-1.1% were obtained under simulated AM 1.5, 100 mW/cm(2) irradiation for all-polymer solar cells using the dithienothiophene-based polymers as acceptors in a 1 : 1 ratio with a polythiophene derivative as a donor. The device performance varies with the conjugation length of oligo(dithienothiophene) in the polymer acceptors, and for the best-performing material it can be further optimized to give a power conversion efficiency of 1.5% by increasing the donor/acceptor weight ratio to 3 : 1.
引用
收藏
页码:5794 / 5803
页数:10
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