J-aggregation of a squaraine dye and its application in organic photovoltaic cells

被引:97
作者
Chen, Guo [1 ]
Sasabe, Hisahiro [1 ]
Lu, Wei [3 ]
Wang, Xiao-Feng [1 ]
Kido, Junji [1 ]
Hong, Ziruo [1 ,2 ]
Yang, Yang [2 ]
机构
[1] Yamagata Univ, Grad Sch Sci & Engn, Res Ctr Organ Elect ROEL, Dept Organ Device Engn, Yonezawa, Yamagata 9928510, Japan
[2] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
[3] South Univ Sci & Technol China, Dept Chem, Shenzhen, Peoples R China
基金
日本科学技术振兴机构;
关键词
OPEN-CIRCUIT VOLTAGE; POLYMER SOLAR-CELLS;
D O I
10.1039/c3tc31243g
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this paper, we investigated the aggregation behavior of a squaraine dye in solid films, as well as the effects on its optical and electrical properties. We observed a strong intermolecular interaction in thin films, which can be controlled via processing solvents. Two typical aggregation behaviors, i.e. H- and J-aggregation, can be selectively formed via the proper selection of solvents, resulting in a significant difference in material properties and the resultant photovoltaic performance. In addition to the monomer absorption between 600 nm and 700 nm, the H-aggregation mainly absorbs green light around 500-600 nm, while the J-aggregation shows a strong absorption in the near infrared range up to 850 nm. Therefore in squaraine/fullerene bi-layer hetero-junction photovoltaic cells, we demonstrated a significant contribution of J-aggregation to the photocurrent. Furthermore the J-aggregation films have a deeper ionization potential, most likely due to the intermolecular charge-transfer interaction, and thus gave rise to a larger open circuit voltage than those of the H-aggregation based devices. The J-aggregation formation shall be considered as an effective approach to tune the optical/electrical properties in organic optoelectronic devices.
引用
收藏
页码:6547 / 6552
页数:6
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