Effect of fluorine substitution on the photovoltaic performance of poly(thiophene-quinoxaline) copolymers

	Effect of fluorine substitution on the photovoltaic performance of poly(thiophene-quinoxaline) copolymers
	Qiao, Zi 1,2; Wang, Meng 1,2; Zhao, Mingzhi 1,2; Zhang, ZhiGuo 3; Li, Yongfang 3; Li, Xiaoyu 1,2; Wang, Haiqiao 1,2
刊名	POLYMER CHEMISTRY
	2015
卷号	6 期号:47 页码:8203-8213
英文摘要	In order to investigate the effects of fluorine atoms on the photovoltaic performance, three 2-D D-A conjugated copolymers, namely PT-QX (0F), PT-FQX (1F) and PT-DFQX (2F), were designed and synthesized using alkylthienyl substituted quinoxaline with different numbers of F substituents as the acceptor unit and thiophene as the donor unit. The physicochemical and photovoltaic properties were comparatively studied in detail. The results demonstrate that the highest occupied molecular orbital (HOMO) energy levels are gradually lowered from -5.10 eV to -5.18 eV and then to -5.33 eV for PT-QX (0F), PT-FQX (1F) and PT-DFQX (2F), respectively, while the lowest occupied molecular orbital (LUMO) energy levels nearly remain constant with the increase of F substituents. Introducing F on the polymer backbone widens the energy bandgap and makes the absorption peaks of the polymers blue-shifted. The highest power conversion efficiencies of bulk heterojuncton polymer solar cells increased with the increase of F substituents from 2.82% for PT-QX (0F) to 4.14% for PT-FQX (1F) to 5.19% for PT-DFQX (2F) thanks to the enhanced V-oc and J(sc). The enhanced V-oc and J(sc) can be mainly ascribed to the lower HOMO energy levels and moderate hole mobility of the fluorinated polymers, as well as the better morphology and preferential orientation of the face-on structure of the blend films of the fluorinated polymer donor with a PC71BM acceptor.
收录类别	SCI
语种	英语
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/29292]
专题	化学研究所_有机固体实验室
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, Minist Educ, Key Lab Carbon Fiber & Funct Polymers, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Qiao, Zi,Wang, Meng,Zhao, Mingzhi,et al. Effect of fluorine substitution on the photovoltaic performance of poly(thiophene-quinoxaline) copolymers[J]. POLYMER CHEMISTRY,2015,6(47):8203-8213.
APA	Qiao, Zi.,Wang, Meng.,Zhao, Mingzhi.,Zhang, ZhiGuo.,Li, Yongfang.,...&Wang, Haiqiao.(2015).Effect of fluorine substitution on the photovoltaic performance of poly(thiophene-quinoxaline) copolymers.POLYMER CHEMISTRY,6(47),8203-8213.
MLA	Qiao, Zi,et al."Effect of fluorine substitution on the photovoltaic performance of poly(thiophene-quinoxaline) copolymers".POLYMER CHEMISTRY 6.47(2015):8203-8213.