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

Chen, Guo1; Sasabe, Hisahiro1; Lu, Wei3; Wang, Xiao-Feng1; Kido, Junji1; Hong, Ziruo1,2; Yang, Yang2

2013

10.1039/c3tc31243g

Journal of Materials Chemistry C   影响因子和分区

2050-7526

2050-7534

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.

SCI ; EI

英语

其他

Adaptable and Seamless Technology Transfer Program (A-STEP)[AS232Z00929D]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied

WOS:000324940000007

ROYAL SOC CHEMISTRY

20134116824199

Charge transfer ; Infrared devices ; Ionization potential ; Open circuit voltage ; Photoelectrochemical cells ; Photovoltaic cells ; Thin films

Electric Batteries:702.1 ; Light/Optics:741.1 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2

Web of Science

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

Chen, Guo,Sasabe, Hisahiro,Lu, Wei,et al. J-aggregation of a squaraine dye and its application in organic photovoltaic cells[J]. Journal of Materials Chemistry C,2013,1(40):6547-6552.

Chen, Guo.,Sasabe, Hisahiro.,Lu, Wei.,Wang, Xiao-Feng.,Kido, Junji.,...&Yang, Yang.(2013).J-aggregation of a squaraine dye and its application in organic photovoltaic cells.Journal of Materials Chemistry C,1(40),6547-6552.

Chen, Guo,et al."J-aggregation of a squaraine dye and its application in organic photovoltaic cells".Journal of Materials Chemistry C 1.40(2013):6547-6552.