Fine-Tuning of Molecular Packing and Energy Level through Methyl Substitution Enabling Excellent Small Molecule Acceptors for Nonfullerene Polymer Solar Cells with Efficiency up to 12.54%

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	Fine-Tuning of Molecular Packing and Energy Level through Methyl Substitution Enabling Excellent Small Molecule Acceptors for Nonfullerene Polymer Solar Cells with Efficiency up to 12.54%
	Luo, Zhenghui; Bin, Haijun; Liu, Tao; Zhang, Zhi-Guo; Yang, Yankang; Zhong, Cheng; Qiu, Beibei; Li, Guanghao; Gao, Wei; Xie, Dongjun
刊名	ADVANCED MATERIALS
	MAR 1 2018
卷号	30 期号:9 页码:-
英文摘要	A novel small molecule acceptor MeIC with a methylated end-capping group is developed. Compared to unmethylated counterparts (ITCPTC), MeIC exhibits a higher lowest unoccupied molecular orbital (LUMO) level value, tighter molecular packing, better crystallites quality, and stronger absorption in the range of 520-740 nm. The MeIC-based polymer solar cells (PSCs) with J71 as donor, achieve high power conversion efficiency (PCE), up to 12.54% with a short-circuit current (J(SC)) of 18.41 mA cm(-2), significantly higher than that of the device based on J71:ITCPTC (11.63% with a J(SC) of 17.52 mA cm(-2)). The higher J(SC) of the PSC based on J71:MeIC can be attributed to more balanced (h)/(e), higher charge dissociation and charge collection efficiency, better molecular packing, and more proper phase separation features as indicated by grazing incident X-ray diffraction and resonant soft X-ray scattering results. It is worth mentioning that the as-cast PSCs based on MeIC also yield a high PCE of 11.26%, which is among the highest value for the as-cast nonfullerene PSCs so far. Such a small modification that leads to so significant an improvement of the photovoltaic performance is a quite exciting finding, shining a light on the molecular design of the nonfullerene acceptors.
WOS记录号	WOS:000426491600033
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/38736]
专题	化学研究所_其它
推荐引用方式 GB/T 7714	Luo, Zhenghui,Bin, Haijun,Liu, Tao,et al. Fine-Tuning of Molecular Packing and Energy Level through Methyl Substitution Enabling Excellent Small Molecule Acceptors for Nonfullerene Polymer Solar Cells with Efficiency up to 12.54%[J]. ADVANCED MATERIALS,MAR ,30(9):-.
APA	Luo, Zhenghui.,Bin, Haijun.,Liu, Tao.,Zhang, Zhi-Guo.,Yang, Yankang.,...&Yang, Chuluo.(MAR ).Fine-Tuning of Molecular Packing and Energy Level through Methyl Substitution Enabling Excellent Small Molecule Acceptors for Nonfullerene Polymer Solar Cells with Efficiency up to 12.54%.ADVANCED MATERIALS,30(9),-.
MLA	Luo, Zhenghui,et al."Fine-Tuning of Molecular Packing and Energy Level through Methyl Substitution Enabling Excellent Small Molecule Acceptors for Nonfullerene Polymer Solar Cells with Efficiency up to 12.54%".ADVANCED MATERIALS 30.9(MAR ):-.