Development of Spiro[cyclopenta[1,2-b:5,4-b ']dithiophene-4,9 '-fluorene]-Based A-pi-D-pi-A Small Molecules with Different Acceptor Units for Efficient Organic Solar Cells

	Development of Spiro[cyclopenta[1,2-b:5,4-b ']dithiophene-4,9 '-fluorene]-Based A-pi-D-pi-A Small Molecules with Different Acceptor Units for Efficient Organic Solar Cells
	Wang, Wengong 1,2,3; Shen, Ping 1,2; Dong, Xinning 3; Weng, Chao 1,2; Wang, Guo 1,2; Bin, Haijun 3; Zhang, Jing 4; Zhang, Zhi-Guo 3; Li, Yongfang 3
刊名	ACS APPLIED MATERIALS & INTERFACES
	2017-02-08
卷号	9 期号:5 页码:4614-4625
关键词	A-pi-d-pi-a Small Molecule Spiro[Cyclopenta[1 Organic Solar Cells 2-b:5 Photovoltaic Properties 4-b ']Dithiophene-4 Acceptor Unit 9 '-fluorene]
英文摘要	Three acceptor-pi-donor-pi-acceptor (A-pi-D-pi-A) small molecules (STFYT, STFRDN, and STFRCN) with Spiro [cydopenta[1,2-b:5,4-b']dithiophene-4,9'-fluorene] (STF) as the central donor unit, terthiophene as the pi-conjugated bridge, indenedione, 3-ethylrhodanine, or 2-(1,1-dicyanomethylene)rhodanine as the acceptor unit are designed, synthesized, and characterized as electron donor materials in solution-processing organic solar cells (OSCs). The effects of the spiro STF-based central core and different acceptors on the molecular configuration, absorption properties, electronic energy levels, carrier transport properties, the morphology of active layers, and photovoltaic properties are investigated in detail. The three molecules exhibit desirable physicochemical features: wide absorption bands (300-850 nm) and high molar absorption coefficients (4.82 X 10(4) to 7.56 X 10(4) M-1 cm(-1)) and relatively low HOMO levels (-5.15 to-5.38 eV). Density functional theory calculations reveal that the spiro STF central core benefits to reduce the steric hindrance effect between the central donor block and terthiophene bridge and suppress excessive intermolecular aggregations. The optimized OSCs based on these molecules deliver power conversion efficiencies (PCEs) of 6.68%, 3.30%, and 4.33% for STFYT, STFRDN, and STFRCN, respectively. The higher PCE of STFYT-based OSCs should be ascribed to its better absorption ability, higher and balanced hole and electron mobilities, and superior active layer morphology as compared to the other two compounds. So far, this is the first example of developing the A-pi-D-pi-A type small molecules with a spiro central donor core for high-performance OSC applications. Meanwhile, these results demonstrate that using spiro central block to construct A-pi-D-pi-A molecule is an alternative and effective strategy for achieving high-performance small molecule donor materials.
语种	英语
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/38127]
专题	化学研究所_有机固体实验室
作者单位	1.Xiangtan Univ, Minist Educ, Coll Chem, Xiangtan 411105, Peoples R China 2.Xiangtan Univ, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Peoples R China 3.Chinese Acad Sci, Inst Chem, CAS Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China 4.Changzhou Univ, Sch Mat Sci & Engn, Jiangsu Collaborat Innovat Cent Photovolta Sci &, Changzhou 213164, Peoples R China
推荐引用方式 GB/T 7714	Wang, Wengong,Shen, Ping,Dong, Xinning,et al. Development of Spiro[cyclopenta[1,2-b:5,4-b ']dithiophene-4,9 '-fluorene]-Based A-pi-D-pi-A Small Molecules with Different Acceptor Units for Efficient Organic Solar Cells[J]. ACS APPLIED MATERIALS & INTERFACES,2017,9(5):4614-4625.
APA	Wang, Wengong.,Shen, Ping.,Dong, Xinning.,Weng, Chao.,Wang, Guo.,...&Li, Yongfang.(2017).Development of Spiro[cyclopenta[1,2-b:5,4-b ']dithiophene-4,9 '-fluorene]-Based A-pi-D-pi-A Small Molecules with Different Acceptor Units for Efficient Organic Solar Cells.ACS APPLIED MATERIALS & INTERFACES,9(5),4614-4625.
MLA	Wang, Wengong,et al."Development of Spiro[cyclopenta[1,2-b:5,4-b ']dithiophene-4,9 '-fluorene]-Based A-pi-D-pi-A Small Molecules with Different Acceptor Units for Efficient Organic Solar Cells".ACS APPLIED MATERIALS & INTERFACES 9.5(2017):4614-4625.