Highly efficient polymer solar cells with PTB7-based narrow band-gap conjugated polyelectrolytes as cathode interlayers: Device performance dependence on the ionic pendants

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	Highly efficient polymer solar cells with PTB7-based narrow band-gap conjugated polyelectrolytes as cathode interlayers: Device performance dependence on the ionic pendants
	Zhang, Wenjun; Song, Changjian; Li, Yaru; Liu, Xiaohui; Wang, Xingzhu; Sun, Xiaohua; Fang, Junfeng
刊名	ORGANIC ELECTRONICS
	2017
卷号	47 页码:94-101
ISSN号	1566-1199
英文摘要	Narrow band-gap conjugated polyelectrolytes (NBGCPs) combine the advantages of narrow band-gap conjugated polymers and polyelectrolytes. However, they are limited reported and seldom used in polymer solar cells (PSCs). Herein, we design and synthesized two PTB7-based NBGCPs, cationic PTB7-NBr and zwitterionic PTB7-NSO3, as cathode interlayers (CILs) in conventional PSCs. Compared to poly [4,8-bis(2-ethylhexyloxyl)benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-ethylhexyl-3-fuorothithieno[3,4-b]thiophene-2-carboxylate-4,6-diyl] (PTB7), both PTB7-NBr and PTB7-NSO3 have similar absorption while PTB7-NBr has a higher HOMO level than PTB7 and PTB7-NSO3. With PTB7-NBr and PTB7-NSO3 as CIL and Al as cathode, the devices both exhibited high efficiencies. The optimal power conversion efficiencies (PCEs) of PTB7-NBr device and PTB7-NSO3 device are about 9%. However, PTB7-NBr devices are less sensitive to the CIL film thicknesses and the PCEs of PTB7-NSO3 device decrease sharply when the thickness of PTB7-NSO3 over 3 nm. What's more, when the devices with an Ag cathode PTB7-NBr exhibits a much better interfacial modification than PTB7-NSO3. Ultraviolet photoelectron spectroscopy (UPS) indicate that the work functions of PTB7-NBr and PTB7-NSO3 film on Al are identical while on Ag they are different. We suggest the insensitivity to CIL thickness and good performance for Ag device of PTB7-NBr devices are attributed to the bromide anions in PTB7-NBr. The report on PTB7-based NBGCPs broads the types of organic cathode interfacial materials and is beneficial to the deep insight of ionic effect in electrolyte materials. (C) 2017 Elsevier B.V. All rights reserved.
公开日期	2017-12-25
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/13713]
专题	2017专题
推荐引用方式 GB/T 7714	Zhang, Wenjun,Song, Changjian,Li, Yaru,et al. Highly efficient polymer solar cells with PTB7-based narrow band-gap conjugated polyelectrolytes as cathode interlayers: Device performance dependence on the ionic pendants[J]. ORGANIC ELECTRONICS,2017,47:94-101.
APA	Zhang, Wenjun.,Song, Changjian.,Li, Yaru.,Liu, Xiaohui.,Wang, Xingzhu.,...&Fang, Junfeng.(2017).Highly efficient polymer solar cells with PTB7-based narrow band-gap conjugated polyelectrolytes as cathode interlayers: Device performance dependence on the ionic pendants.ORGANIC ELECTRONICS,47,94-101.
MLA	Zhang, Wenjun,et al."Highly efficient polymer solar cells with PTB7-based narrow band-gap conjugated polyelectrolytes as cathode interlayers: Device performance dependence on the ionic pendants".ORGANIC ELECTRONICS 47(2017):94-101.