Balancing the H- and J-aggregation in DTS(PTTh2)(2)/PC70BM to yield a high photovoltaic efficiency

	Balancing the H- and J-aggregation in DTS(PTTh2)(2)/PC70BM to yield a high photovoltaic efficiency
	Zhao, Qiaoqiao 1,2; Liu, Jiangang 1,2; Wang, Haiyang 1,2; Li, Mingguang 1,2; Zhou, Ke 1,2; Yang, Hua 1,2; Han, Yanchun 1,2
刊名	JOURNAL OF MATERIALS CHEMISTRY C
	2015
卷号	3 期号:31 页码:8183-8192
英文摘要	The content and ratio of two stacking styles, namely H-aggregation and J-aggregation, of 5,5'-bis{(4-(7-hexylthiophen-2-yl)thiophen-2-yl)-[1,2,5]thiadiazolo[3,4-c]pyridine}-3,3'-di-2-ethylhexylsilylene-2,2'-bithiophene, DTS(PTTh2)(2), had a profound influence on the performance of solar cells based on DTS(PTTh2)(2)/[6,6]phenyl-C71-butyric acid methyl ester (PC70BM) (7/3, w/w) blend films. It was found that the H/J ratio could be tuned from 0.30 to 1.40 by controlling the boiling point of the main solvent, the content of additives and the selective dissolution by additives (such as 1,8-diiodooctane (DIO), 1,6-diiodohexane (DIH) and 1,4-diiodobutane (DIB)) of the DTS(PTTh2)(2) side chains. The power conversion efficiency (PCE) of DTS(PTTh2)(2)/PC70BM was firstly improved, then decreased with increasing H/J ratio. The best PCE of 6.51% was achieved by adding 0.20 vol% 1,6-diiodohexane (DIO) into solutions in thiophene (Th), which improved it by 203% compared to the reference without additives, when the H/J ratio was 1.01. Balance between the two stacking styles is needed for the device to obtain best performance. On one hand, J-aggregation was favorable for forming more excitons because a lower energy was needed to excite the J-aggregation. On the other hand, the H-aggregation favored exciton dissociation for two reasons: providing excitons with a longer lifetime and stronger driving force for exciton dissociation. In addition, the complementary light absorption of the two stacking styles is advantageous for maximal light absorption.
收录类别	SCI
语种	英语
公开日期	2015-10-27
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/27765]
专题	化学研究所_高分子物理与化学实验室
作者单位	1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Qiaoqiao,Liu, Jiangang,Wang, Haiyang,et al. Balancing the H- and J-aggregation in DTS(PTTh2)(2)/PC70BM to yield a high photovoltaic efficiency[J]. JOURNAL OF MATERIALS CHEMISTRY C,2015,3(31):8183-8192.
APA	Zhao, Qiaoqiao.,Liu, Jiangang.,Wang, Haiyang.,Li, Mingguang.,Zhou, Ke.,...&Han, Yanchun.(2015).Balancing the H- and J-aggregation in DTS(PTTh2)(2)/PC70BM to yield a high photovoltaic efficiency.JOURNAL OF MATERIALS CHEMISTRY C,3(31),8183-8192.
MLA	Zhao, Qiaoqiao,et al."Balancing the H- and J-aggregation in DTS(PTTh2)(2)/PC70BM to yield a high photovoltaic efficiency".JOURNAL OF MATERIALS CHEMISTRY C 3.31(2015):8183-8192.