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

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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.

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ACKNOWLEDGMENTS

This work was supported by Joint Research by IMS [Proposal Nos. 28-620 and 29-604] and was conducted under approval of PF Program Advisory Committee [Proposal No. 2015G141]. Financial supports from JSPS-KAKENHI Grant Nos. JP15H05498, JP16K14102, and 26248062, The Precise Measurement Technology Promotion Foundation, Iketani Science and Technology Foundation, and Futaba Electronics Memorial Foundation are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Pure and Applied Chemistry, Tokyo University of Science, Noda, 278-8510, Japan

    Yasuo Nakayama, Masataka Hikasa, Naoki Moriya, Koki Yoshida & Mimi Murata

  2. Institute for Molecular Science (IMS), National Institutes of Natural Sciences, and SOKENDAI, Okazaki, 444-8585, Japan

    Matthias Meissner, Takuma Yamaguchi, Takahiro Ueba & Satoshi Kera

  3. Institute for Materials Structure Science, High Energy Accelerator Research Organization (KEK), and SOKENDAI, Tsukuba, 305-0801, Japan

    Kazuhiko Mase

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  1. Yasuo Nakayama
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Nakayama, Y., Hikasa, M., Moriya, N. et al. Anisotropic valence band dispersion of single crystal pentacene as measured by angle-resolved ultraviolet photoelectron spectroscopy. Journal of Materials Research 33, 3362–3370 (2018). https://doi.org/10.1557/jmr.2018.315

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