Rational Design of Small Molecular Donor for Solution-Processed Organic   Photovoltaics with 8.1% Efficiency and High Fill Factor via Multiple   Fluorine Substituents and Thiophene Bridge

doi:10.1002/adfm.201500190

CORC > 北京大学 > 化学与分子工程学院

	Rational Design of Small Molecular Donor for Solution-Processed Organic Photovoltaics with 8.1% Efficiency and High Fill Factor via Multiple Fluorine Substituents and Thiophene Bridge
	Wang, Jin-Liang ; Yin, Qing-Ru ; Miao, Jing-Sheng ; Wu, Zhuo ; Chang, Zheng-Feng ; Cao, Yue ; Zhang, Ru-Bo ; Wang, Jie-Yu ; Wu, Hong-Bin ; Cao, Yong
刊名	ADVANCED FUNCTIONAL MATERIALS
	2015
关键词	molecular design multiple fluorine substituents organic solar cells small molecule thiophene spacer HETEROJUNCTION SOLAR-CELLS POWER-CONVERSION EFFICIENCY FIELD-EFFECT TRANSISTORS OPEN-CIRCUIT VOLTAGE BENZODITHIOPHENE UNIT CONJUGATED POLYMERS BUILDING-BLOCK SIDE-CHAINS PERFORMANCE INDACENODITHIOPHENE
DOI	10.1002/adfm.201500190
英文摘要	A series of tetrafluorine-substituted small molecules with a D-1-A-D-2-A-D-1 linear framework based on indacenodithiophene and difluorobenzothiadiazole is designed and synthesized for application as donor materials in solution-processed small-molecule organic solar cells. The impacts of thiophene -bridge and multiple fluorinated modules on the photophysical properties, the energy levels of the highest occupied molecular orbitals (HOMO) and lowest unoccupied molecular orbitals (LUMO), charge carrier mobility, the morphologies of blend films, and their photovoltaic properties as electron donor material in the photoactive layer are investigated. By incorporating multiple fluorine substituents of benzothiadiazole and inserting two thiophene spacers, the fill factor (FF), open-circuit voltage, and short-circuit current density are dramatically improved in comparison with fluorinated-free materials. With the solvent vapor annealing treatment, further enhancement in charge carrier mobility and power conversion efficiency (PCE) are achieved. Finally, a high PCE of 8.1% with very-high FF of 0.76 for BIT-4F-T/PC71BM is achieved without additional additive, which is among one of the highest reported for small-molecules-based solar cells with PCE over 8%. The results reported here clearly indicate that high PCE in solar cells based small molecules can be significantly increased through careful engineering of the molecular structure and optimization on the morphology of blend films by solvent vapor annealing.; National Natural Science Foundation of China [21202007, 21472012, 51225301, 91333206]; Thousand Youth Talents Plan of China, Beijing Natural Science Foundation [2152027]; Development Program for Distinguished Young and Middle-Aged Teachers; Special programs to cultivate major projects of the Beijing Institute of Technology; SCI(E); EI; ARTICLE; jinlwang@bit.edu.cn; zhangrubo@bit.edu.cn; jieyuwang@pku.edu.cn; hbwu@scut.edu.cn; 23; 3514-3523; 25
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/419290]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Wang, Jin-Liang,Yin, Qing-Ru,Miao, Jing-Sheng,et al. Rational Design of Small Molecular Donor for Solution-Processed Organic Photovoltaics with 8.1% Efficiency and High Fill Factor via Multiple Fluorine Substituents and Thiophene Bridge[J]. ADVANCED FUNCTIONAL MATERIALS,2015.
APA	Wang, Jin-Liang.,Yin, Qing-Ru.,Miao, Jing-Sheng.,Wu, Zhuo.,Chang, Zheng-Feng.,...&Cao, Yong.(2015).Rational Design of Small Molecular Donor for Solution-Processed Organic Photovoltaics with 8.1% Efficiency and High Fill Factor via Multiple Fluorine Substituents and Thiophene Bridge.ADVANCED FUNCTIONAL MATERIALS.
MLA	Wang, Jin-Liang,et al."Rational Design of Small Molecular Donor for Solution-Processed Organic Photovoltaics with 8.1% Efficiency and High Fill Factor via Multiple Fluorine Substituents and Thiophene Bridge".ADVANCED FUNCTIONAL MATERIALS (2015).