Thiazole-Induced Quinoid Polymers for Efficient Solar Cells: Influence of Molecular Skeleton, Regioselectivity, and Regioregularity

doi:10.1021/acs.chemmater.8b01250

	Thiazole-Induced Quinoid Polymers for Efficient Solar Cells: Influence of Molecular Skeleton, Regioselectivity, and Regioregularity
	Zhu, Dangqiang; Wang, Qian; Wang, Yingying; Bao, Xichang; Qiu, Meng; Shahid, Bilal; Li, Yonghai; Yang, Renqiang
刊名	CHEMISTRY OF MATERIALS
	2018-07-24
卷号	30 期号:14 页码:4639-4645
ISSN号	0897-4756
DOI	10.1021/acs.chemmater.8b01250
英文摘要	Fluorination strategy has been regarded as a promising approach to improve the photovoltaic performance in polymer solar cells. However, the synthesis is relatively tedious and costly for most fluorinated momomers. In this work, which is different from works where fluorine atoms are usually incorporated on the side chain, we successfully developed a thiazole-induced strategy to construct efficient photovoltaic materials via inserting one thiazole unit into the backbone of a nonfluorinated quinoid polymer, which would enhance the intermolecular interactions and decrease the ionization potential (IP) of the resulted polymers, benefiting from the desirable molecular skeleton. And then, considering the asymmetry nature of acceptor segments, the influence of molecular regioselectivity with different orientations of the thiazole unit on optoelectronic properties was systematically investigated. Encouragingly, a superior power conversion efficiency (PCE) of 9.36% for PBTzT-4-based photovoltaic device was obtained, higher than that of the isomer polymer PBTzT-6 (PCE = 8.52%) and a signficant increase of 50% compared to the widely reported analogue polymer PBDTTT-E-T (PCE = 6.21%) just without a thiazole unit, which can be ascribed to more planar molecular conformation, stronger crystallinity, and excellent phase separation. More interestingly, compared with random polymers, the regioregular copolymers exhibit enhanced red-shifted absorption and better crystallinity and compatibility with PC71BM, leading to more desirable efficicency for PBTzT-4R-based devices (PCE = 9.63%) with higher J(sc) of 17.56 mA/cm(2), which can be comparable to the typical polymer PTB7-Th. This work not only provides a new strategy to improve the intermolecular interaction through backbone design but also reveals that the orientations of the asymmetric unit (that is, regioselectivity and regioregularity) along the polymer backbone play a crucial role and should be taken into account in future molecule design.
资助项目	National Natural Science Foundation of China[21604092] ; National Natural Science Foundation of China[51573205] ; National Natural Science Foundation of China[51773220] ; Ministry of Science and Technology of China[2014CB643501] ; China Postdoctoral Science Foundation[2017M610453] ; Youth Innovation Promotion Association CAS[2016194]
WOS关键词	LOW-BANDGAP POLYMER ; HIGH-PERFORMANCE ; CONJUGATED POLYMERS ; PHOTOVOLTAIC POLYMERS ; ACCEPTOR ; FLUORINATION ; COPOLYMERS ; BENZODITHIOPHENE ; THIENOTHIOPHENE ; CONFORMATION
WOS研究方向	Chemistry ; Materials Science
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000440105500020
资助机构	National Natural Science Foundation of China ; Ministry of Science and Technology of China ; China Postdoctoral Science Foundation ; Youth Innovation Promotion Association CAS
内容类型	期刊论文
源URL	[http://ir.qibebt.ac.cn/handle/337004/12379]
专题	中国科学院青岛生物能源与过程研究所
通讯作者	Yang, Renqiang
作者单位	Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, CAS Key Lab Biobased Mat, Qingdao 266101, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Dangqiang,Wang, Qian,Wang, Yingying,et al. Thiazole-Induced Quinoid Polymers for Efficient Solar Cells: Influence of Molecular Skeleton, Regioselectivity, and Regioregularity[J]. CHEMISTRY OF MATERIALS,2018,30(14):4639-4645.
APA	Zhu, Dangqiang.,Wang, Qian.,Wang, Yingying.,Bao, Xichang.,Qiu, Meng.,...&Yang, Renqiang.(2018).Thiazole-Induced Quinoid Polymers for Efficient Solar Cells: Influence of Molecular Skeleton, Regioselectivity, and Regioregularity.CHEMISTRY OF MATERIALS,30(14),4639-4645.
MLA	Zhu, Dangqiang,et al."Thiazole-Induced Quinoid Polymers for Efficient Solar Cells: Influence of Molecular Skeleton, Regioselectivity, and Regioregularity".CHEMISTRY OF MATERIALS 30.14(2018):4639-4645.