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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/10872

Title: Molecular order, charge injection efficiency and the role of intermolecular polar bonds at organic/organic heterointerfaces
Authors: Wang, Y.
Matsushima, T.
Murata, H.
Fleurence, A.
Yamada-Takamura, Y.
Friedlein, R.
Keywords: ultraviolet photoelectron spectroscopy
electronic structure
hole-only devices
molecular orientation
Issue Date: 2012-06-13
Publisher: Elsevier
Magazine name: Organic Electronics
Volume: 13
Number: 10
Start page: 1853
End page: 1858
DOI: 10.1016/j.orgel.2012.05.038
Abstract: The effect of orientational changes in thin films of the non-crystalline hole transport material α-N-N′-diphenyl N-N″-bis(1 naphthayl)-1,1′-biphenyl-4,4′-diamine (α-NPD) on the energy level alignment and the film electronic structure has been investigated by angle-resolved ultraviolet photoelectron spectroscopy and related to the transport characteristics of hole-only devices. Changes in the anisotropic α-sexithiophene (α-6T) substrate from a “standing” to a “flat” molecular orientation induced by mechanical rubbing lead to molecular order and a preferential orientation in subsequently deposited thin α-NPD films and cause a reduction of the charge injection barrier at the organic/organic interface. The results show that the height of this barrier is determined by the surface dipoles of the individual organic films that relate to the orientation of intramolecular polar bonds at the interface.
Rights: NOTICE: This is the author's version of a work accepted for publication by Elsevier. Y. Wang, T. Matsushima, H. Murata, A. Fleurence, Y. Yamada-Takamura, R. Friedlein, Organic Electronics, 13(10), 2012, 1853-1858, http://dx.doi.org/10.1016/j.orgel.2012.05.038
URI: http://hdl.handle.net/10119/10872
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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