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Impact of Film Structure on Ionization Energy of Titanyl-Phthalocyanine in Thin Films

Published online by Cambridge University Press:  02 December 2013

Takuya Hosokai ,
Keiichirou Yonezawa ,
Rintaro Makino ,
Noritsugu Kanayama ,
Tomoyuki Koganezawa ,
Koji K. Okudaira ,
Satoshi Kera  and
Nobuo Ueno
Takuya Hosokai
Affiliation:
Department of Materials Science and Technology, Iwate University, 4-3-5 Ueda, Morioka, 0208551 Iwate, JAPAN
Keiichirou Yonezawa
Affiliation:
Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, 26385522 Chiba, JAPAN
Rintaro Makino
Affiliation:
Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, 26385522 Chiba, JAPAN
Noritsugu Kanayama
Affiliation:
Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, 26385522 Chiba, JAPAN
Tomoyuki Koganezawa
Affiliation:
Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, 6795198 Hyogo, JAPAN
Koji K. Okudaira
Affiliation:
Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, 26385522 Chiba, JAPAN
Satoshi Kera
Affiliation:
Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, 26385522 Chiba, JAPAN
Nobuo Ueno
Affiliation:
Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, 26385522 Chiba, JAPAN
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Abstract

Structure-related ionization energy (IE) of vacuum-deposited titanyl-phthalocyanine (OTiPc) thin films was investigated by using in situ ultraviolet photoelectron spectroscopy (UPS) and X-ray diffractometry. Distinct molecular orientations (i.e. lying-flat and standing-up orientation) in different polymorphous (i.e. monoclinic β-phase and triclinic α-phase) were observed on a surface of polycrystalline (poly-) Au and octadecyltrichlorosilane-self assembled monolayer (OTS-SAM). For the two structures IE of the highest occupied molecular orbital (HOMO) of OTiPc thin films altered significantly by 0.55 eV. The different IE was attributed to surface dipole potential and strong intermolecular interaction.

Keywords

electronic structurex-ray diffraction (XRD)organic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1605: Symposium V – Interface Phenomena in Organic Electronics , 2013 , jsapmrs13-6008
Copyright
Copyright © Materials Research Society 2013 

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