The role of conjugated side chains in high performance photovoltaic polymers

doi:10.1039/c4ta05445h

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	The role of conjugated side chains in high performance photovoltaic polymers
	Wang, Meng 1,2; Ma, Di 1; Shi, Keli 1,3; Shi, Shaowei 1; Chen, Song 4; Huang, Changjiang 1; Qiao, Zi 1; Zhang, Zhi-Guo 3; Li, Yongfang 3; Li, Xiaoyu 1
刊名	JOURNAL OF MATERIALS CHEMISTRY A
	2015
卷号	3 期号:6 页码:2802-2814
ISSN号	2050-7488
DOI	10.1039/c4ta05445h
英文摘要	Four new D-A type copolymers, namely, PBDT-DFQX-PP, PBDT-DFQX-TP, PBDT-DFQX-PT and PBDT-DFQX-TT, were designed and synthesized to investigate the influence of conjugated side chain pattern on photovoltaic properties of conjugated polymers. All the four copolymers have an identical conjugated backbone comprising benzo[1,2-b: 4,5-b'] dithiophene (BDT) donor unit and quinoxaline (Qx) acceptor unit, but with varying conjugated side chains, p-alkoxyphenyl or 2-alkylthienyl, attached to the donor and acceptor units, respectively. As evidenced by UV/Vis absorption spectra, electrochemical cyclic voltammetry, density functional theory (DFT), grazing incidence X-ray scattering (GIXS), transmission electron microscope (TEM) and photovoltaic measurements, the difference in conjugated side chain modulation led to totally different physicochemical properties. Among the four copolymers, PBDT-DFQX-TT exhibits the broadest absorption spectrum, the most close-packed structure as well as a finest fibril structure when blended with PC71BM. After systematic device optimization, the power conversion efficiencies (PCEs) of the bulk heterojunction (BHJ) photovoltaic devices based on the blends of PBDT-DFQX-PP, PBDT-DFQX-TP, PBDT-DFQX-PT and PBDT-DFQX-TT with PC71BM achieved 3.96%, 6.08%, 6.54% and 7.68%, respectively. By systematic varying the side chains of the copolymers from all phenyl groups to all thienyl ones, PCEs was increased by 250% from 3.96% to 7.68%. To date, PBDT-DFQX-TT is one of a few Qx-based PSCs that exhibits PCE exceeding 7.5%, and the results suggest that simultaneously modulating the conjugated side chains on both donor and acceptor units of copolymers could be an effective strategy for constructing high performance photovoltaic copolymers.
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000348990500039
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/53451]
专题	中国科学院化学研究所
通讯作者	Wang, Haiqiao
作者单位	1.Beijing Univ Chem Technol, State Key Lab Organ Inorgan Composite, Beijing 100029, Peoples R China 2.Beijing Univ Chem Technol, Key Lab Carbon Fiber & Funct Polymers, Minist Educ, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China 4.China Text Acad, Beijing 100025, Peoples R China
推荐引用方式 GB/T 7714	Wang, Meng,Ma, Di,Shi, Keli,et al. The role of conjugated side chains in high performance photovoltaic polymers[J]. JOURNAL OF MATERIALS CHEMISTRY A,2015,3(6):2802-2814.
APA	Wang, Meng.,Ma, Di.,Shi, Keli.,Shi, Shaowei.,Chen, Song.,...&Wang, Haiqiao.(2015).The role of conjugated side chains in high performance photovoltaic polymers.JOURNAL OF MATERIALS CHEMISTRY A,3(6),2802-2814.
MLA	Wang, Meng,et al."The role of conjugated side chains in high performance photovoltaic polymers".JOURNAL OF MATERIALS CHEMISTRY A 3.6(2015):2802-2814.