An Energetic and Kinetic View on Cyclopentadithiophene Dye-Sensitized Solar Cells: The Influence of Fluorine vs Ethyl Substituent

doi:10.1021/jp110384n

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	An Energetic and Kinetic View on Cyclopentadithiophene Dye-Sensitized Solar Cells: The Influence of Fluorine vs Ethyl Substituent
	Zhou, Difei 1,2; Cai, Ning 1,2; Long, Huijin 1; Zhang, Min 1; Wang, Yinghui 1; Wang, Peng 1
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2011-02-24
卷号	115 期号:7 页码:3163-3171
ISSN号	1932-7447
DOI	10.1021/jp110384n
英文摘要	A comprehensive understanding on the structure property relationship of metal-free organic chromophores in dye-sensitized solar cells will form the basis of further design of advanced materials and realization of considerable enhancement of device performance, boosting the widespread utilization of solar energy at an affordable cost. In this paper we report profound influences of the fluorine versus ethyl substituent of the cyclopentadithiophene conjugated spacer of push pull photosensitizers, upon the energetic and kinetic characteristics of dye-sensitized solar cells. Joint electrochemical and spectral measurements reveal that with respect to the fluorine-containing dye, the ethyl counterpart exhibits a 0.18 V more negative excited-state redox potential upon anchoring on titania, which overwhelms the 0.01 eV upward conduction band edge shift of the dye-coated titania film. The ethyl-correlated more favorable dye/titania interface energetics benefits a remarkably higher electron injection yield, which is verified with the transient emission and photocurrent action spectrum measurements. Furthermore, analysis on the electrical impedance data affords a notably smaller recombination reaction order for the cell made from the ethyl-substituting chromophore than that of the fluorine counterpart, accounting for a remarkably suppressed interfacial charge recombination with triiodide and thus explaining the observed higher open-circuit photovoltage.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000287338100033
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/71845]
专题	中国科学院化学研究所
通讯作者	Wang, Peng
作者单位	1.Chinese Acad Sci, State Key Lab Polymer Phys & Chem, Changchun Inst Appl Chem, Changchun 130022, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Difei,Cai, Ning,Long, Huijin,et al. An Energetic and Kinetic View on Cyclopentadithiophene Dye-Sensitized Solar Cells: The Influence of Fluorine vs Ethyl Substituent[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2011,115(7):3163-3171.
APA	Zhou, Difei,Cai, Ning,Long, Huijin,Zhang, Min,Wang, Yinghui,&Wang, Peng.(2011).An Energetic and Kinetic View on Cyclopentadithiophene Dye-Sensitized Solar Cells: The Influence of Fluorine vs Ethyl Substituent.JOURNAL OF PHYSICAL CHEMISTRY C,115(7),3163-3171.
MLA	Zhou, Difei,et al."An Energetic and Kinetic View on Cyclopentadithiophene Dye-Sensitized Solar Cells: The Influence of Fluorine vs Ethyl Substituent".JOURNAL OF PHYSICAL CHEMISTRY C 115.7(2011):3163-3171.