Marked Alkyl- vs Alkenyl-Substitutent Effects on Squaraine Dye Solid-State Structure, Carrier Mobility, and Bulk-Heterojunction Solar Cell Efficiency
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- 作者：Diego Bagnis ; Luca Beverina ; Hui Huang ; Fabio Silvestri ; Yan Yao ; Henry Yan ; Giorgio A. Pagani ; Tobin J. Marks ; Antonio Facchetti
- 刊名：Journal of the American Chemical Society
- 出版年：2010
- 出版时间：March 31, 2010
- 年：2010
- 卷：132
- 期：12
- 页码：4074-4075
- 全文大小：155K
- 年卷期：v.132,no.12(March 31, 2010)
- ISSN：1520-5126
文摘
We report two new squaraine 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 5× that of 1, and the BHJ OPV power conversion efficiency (PCE) of 2 is 2× that of 1. PCEs surpassing 2% for ambient solution-processed devices are demonstrated, the largest so far achieved for squaraine-based organic solar cells.