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Title: Tuning the hole injection barrier at the organic/metal interface with self-assembled functionalized aromatic thiols
Authors: Chen, W. 
Huang, C.
Gao, X.Y. 
Wang, L. 
Zhen, C.G.
Qi, D. 
Chen, S. 
Zhang, H.L. 
Loh, K.P. 
Chen, Z.K.
Wee, A.T.S. 
Issue Date: 28-Dec-2006
Citation: Chen, W., Huang, C., Gao, X.Y., Wang, L., Zhen, C.G., Qi, D., Chen, S., Zhang, H.L., Loh, K.P., Chen, Z.K., Wee, A.T.S. (2006-12-28). Tuning the hole injection barrier at the organic/metal interface with self-assembled functionalized aromatic thiols. Journal of Physical Chemistry B 110 (51) : 26075-26080. ScholarBank@NUS Repository.
Abstract: Self-assembled functionalized aromatic thiols (oligophenylenes composed of building blocks of dimethoxy-substituted phenylenes, perfluoro-substituted phenylenes, and a terminal thiol group) were used to tune the hole injection barrier (Δh) of copper(II) phthalocyanine (CuPc) on Au(111). Synchrotron-based high-resolution photoemission spectroscopy study reveals a significant reduction of Δh by as much as 0.75 eV from Δh = 0.9 eV for CuPc/Au(111) to Δh = 0.15 eV for CuPc/BOF/Au(111), where BOF represents 4-pentafluorophenyl-1-(p-thiophenyl)- 2,5-dimethoxybenzene. The delocalized π orbitals of these functionalized aromatic thiols greatly facilitate effective charge transfer (hole or electron) across the SAM interface as compared to alkanethiols, hence making this novel interface modification scheme a simple and effective way to tune the hole injection barrier. This method has potential applications in molecular electronics, organic light-emitting diodes (OLED), organic field-effect transistors (OFETs), and organic solar cells. © 2006 American Chemical Society.
Source Title: Journal of Physical Chemistry B
ISSN: 15206106
DOI: 10.1021/jp065821q
Appears in Collections:Staff Publications

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