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Anisotropic valence band dispersion of single crystal pentacene as measured by angle-resolved ultraviolet photoelectron spectroscopy

Published online by Cambridge University Press:  07 September 2018

Yasuo Nakayama ,
Masataka Hikasa ,
Naoki Moriya ,
Matthias Meissner ,
Takuma Yamaguchi ,
Koki Yoshida ,
Mimi Murata ,
Kazuhiko Mase ,
Takahiro Ueba  and
Satoshi Kera
Yasuo Nakayama*
Affiliation:
Department of Pure and Applied Chemistry, Tokyo University of Science, Noda 278-8510, Japan
Masataka Hikasa
Affiliation:
Department of Pure and Applied Chemistry, Tokyo University of Science, Noda 278-8510, Japan
Naoki Moriya
Affiliation:
Department of Pure and Applied Chemistry, Tokyo University of Science, Noda 278-8510, Japan
Matthias Meissner
Affiliation:
Institute for Molecular Science (IMS), National Institutes of Natural Sciences, and SOKENDAI, Okazaki 444-8585, Japan
Takuma Yamaguchi
Affiliation:
Institute for Molecular Science (IMS), National Institutes of Natural Sciences, and SOKENDAI, Okazaki 444-8585, Japan
Koki Yoshida
Affiliation:
Department of Pure and Applied Chemistry, Tokyo University of Science, Noda 278-8510, Japan
Mimi Murata
Affiliation:
Department of Pure and Applied Chemistry, Tokyo University of Science, Noda 278-8510, Japan
Kazuhiko Mase
Affiliation:
Institute for Materials Structure Science, High Energy Accelerator Research Organization (KEK), and SOKENDAI, Tsukuba 305-0801, Japan
Takahiro Ueba
Affiliation:
Institute for Molecular Science (IMS), National Institutes of Natural Sciences, and SOKENDAI, Okazaki 444-8585, Japan
Satoshi Kera
Affiliation:
Institute for Molecular Science (IMS), National Institutes of Natural Sciences, and SOKENDAI, Okazaki 444-8585, Japan
*
a)Address all correspondence to this author. e-mail: nkym@rs.tus.ac.jp
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Abstract

Electronic structures of single crystal pentacene are of great interest for the elucidation of charge carrier transport in organic semiconductor materials. Experimental observation of valence band dispersion was recently achieved on single crystal samples of pentacene; however, its intrinsic properties are still unresolved because past experiments were performed on specimens with surface oxides formed by exposure to the ambient atmosphere. In this work, X-ray photoelectron spectroscopy (XPS) and angle-resolved ultraviolet photoelectron spectroscopy (ARUPS) were conducted on single-crystal pentacene samples prepared without ambient exposure. The XPS results confirmed the reduction of the abundance of oxide impurities on the present samples. The ARUPS measurements clearly resolved the valence band structures of the single-crystal pentacene in four symmetry directions of the surface Brillouin zone, indicating anisotropy of at least a factor of 2.4 for the intermolecular transfer integral and hole effective mass at the valence band maximum.

Keywords

ARUPStransfer integraleffective massorganic field effect transistor
Type
Invited Paper
Information
Journal of Materials Research , Volume 33 , Issue 20 , 29 October 2018 , pp. 3362 - 3370
Copyright
Copyright © Materials Research Society 2018 

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References

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