(Figure Presented) We report two new squaralne dyes substituted at the pyrrolic rings with n-hexyl (squaraine 1) or n-hexenyl (squaraine 2) chains. Although Internal molecular structure variations are minimal, the presence of the terminal double bond results in a much more compact solid-state structure, dramatically affecting charge transport in the thin films; the hole mobility of 2 is ∼ 5x that of 1, and the BHJOPV power conversion efficiency (PCE) of 2 is ∼2x that of 1. PCEs surpassing 2% for ambient solution-processed devices are demonstrated, the largest so far achieved for squaraine-based organic solar cells. Copyright © 2010 American Chemical Society.
Bagnis, D., Beverina, L., Huang, H., Silvestri, F., Zheng, Y., Pagani, G., et al. (2010). Marked Alkyl- vs Alkenyl-Substitutent Effects on Squaraine Dye Solid-State Structure, Carrier Mobility, and Bulk-Heterojunction Solar Cell Efficiency. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 132(12), 4074-4075 [10.1021/ja100520q].
Marked Alkyl- vs Alkenyl-Substitutent Effects on Squaraine Dye Solid-State Structure, Carrier Mobility, and Bulk-Heterojunction Solar Cell Efficiency
BEVERINA, LUCA;PAGANI, GIORGIO ALBERTO;
2010
Abstract
(Figure Presented) We report two new squaralne dyes substituted at the pyrrolic rings with n-hexyl (squaraine 1) or n-hexenyl (squaraine 2) chains. Although Internal molecular structure variations are minimal, the presence of the terminal double bond results in a much more compact solid-state structure, dramatically affecting charge transport in the thin films; the hole mobility of 2 is ∼ 5x that of 1, and the BHJOPV power conversion efficiency (PCE) of 2 is ∼2x that of 1. PCEs surpassing 2% for ambient solution-processed devices are demonstrated, the largest so far achieved for squaraine-based organic solar cells. Copyright © 2010 American Chemical Society.
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