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Issue 40, 2013
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J-aggregation of a squaraine dye and its application in organic photovoltaic cells

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Abstract

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.

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

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Publication details

The article was received on 28 Jun 2013, accepted on 24 Jul 2013 and first published on 19 Aug 2013


Article type: Paper
DOI: 10.1039/C3TC31243G
J. Mater. Chem. C, 2013,1, 6547-6552

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

    G. Chen, H. Sasabe, W. Lu, X. Wang, J. Kido, Z. Hong and Y. Yang, J. Mater. Chem. C, 2013, 1, 6547
    DOI: 10.1039/C3TC31243G

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