In situ low-temperature scanning tunneling microscopy and near-edge x-ray absorption spectroscopy measurements have been used to investigate the molecular orientation of 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) thin films at the interface of organic heterojunctions of PTCDA on copper(II) phthalocyanine (CuPc). On the CuPc monolayer on highly oriented pyrolitic graphite, PTCDA molecules form a well-ordered in-plane herringbone structure with their molecular plane parallel to the substrate surface. The formation of multiple in-plane hydrogen bonding between neighboring PTCDA molecules is responsible for the flat-lying PTCDA on CuPc monolayer, and gives rise to the lying-down orientation of PTCDA thin films on both standing-up and lying-down CuPc thin films, as well as on Au(111) passivated by a self-assembled monolayer of octane-1-thiol.
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10 September 2007
Research Article|
September 14 2007
Molecular orientation of 3, 4, 9, 10-perylene-tetracarboxylic-dianhydride thin films at organic heterojunction interfaces
Wei Chen;
Wei Chen
Department of Physics,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
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Han Huang;
Han Huang
Department of Physics,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
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Shi Chen;
Shi Chen
Department of Physics,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
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Lan Chen;
Lan Chen
Department of Physics,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
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Hong Liang Zhang;
Hong Liang Zhang
Department of Physics,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
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Xing Yu Gao;
Xing Yu Gao
Department of Physics,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
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Andrew Thye Shen Wee
Andrew Thye Shen Wee
Department of Physics,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
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Appl. Phys. Lett. 91, 114102 (2007)
Article history
Received:
July 20 2007
Accepted:
August 27 2007
Citation
Wei Chen, Han Huang, Shi Chen, Lan Chen, Hong Liang Zhang, Xing Yu Gao, Andrew Thye Shen Wee; Molecular orientation of 3, 4, 9, 10-perylene-tetracarboxylic-dianhydride thin films at organic heterojunction interfaces. Appl. Phys. Lett. 10 September 2007; 91 (11): 114102. https://doi.org/10.1063/1.2785948
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