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Bussolotti F, Yang J, Yamaguchi T, Yonezawa K, Sato K, Matsunami M, Tanaka K, Nakayama Y, Ishii H, Ueno N, Kera S. Hole-phonon coupling effect on the band dispersion of organic molecular semiconductors. Nat Commun 2017; 8:173. [PMID: 28765525 PMCID: PMC5539254 DOI: 10.1038/s41467-017-00241-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 06/13/2017] [Indexed: 11/09/2022] Open
Abstract
The dynamic interaction between the traveling charges and the molecular vibrations is critical for the charge transport in organic semiconductors. However, a direct evidence of the expected impact of the charge-phonon coupling on the band dispersion of organic semiconductors is yet to be provided. Here, we report on the electronic properties of rubrene single crystal as investigated by angle resolved ultraviolet photoelectron spectroscopy. A gap opening and kink-like features in the rubrene electronic band dispersion are observed. In particular, the latter results in a large enhancement of the hole effective mass (> 1.4), well above the limit of the theoretical estimations. The results are consistent with the expected modifications of the band structures in organic semiconductors as introduced by hole-phonon coupling effects and represent an important experimental step toward the understanding of the charge localization phenomena in organic materials.The charge transport properties in organic semiconductors are affected by the impact of molecular vibrations, yet it has been challenging to quantify them to date. Here, Bussolotti et al. provide direct experimental evidence on the band dispersion modified by molecular vibrations in a rubrene single crystal.
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Affiliation(s)
- F Bussolotti
- Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan. .,Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Innovis, Singapore, #08-03, Singapore.
| | - J Yang
- Graduate School of Advanced Integration Science, Chiba University, Chiba, 263-8522, Japan.,College of Physical Science and Technology, Yangzhou University, Jiangsu, 225009, People's Republic of China
| | - T Yamaguchi
- Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan.,SOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa, 240-0193, Japan
| | - K Yonezawa
- Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan
| | - K Sato
- Graduate School of Advanced Integration Science, Chiba University, Chiba, 263-8522, Japan
| | - M Matsunami
- Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan.,Toyota Technological Institute, 2-12-1 Hisakata, Tempaku-ku, Nagoya, 468-8511, Japan
| | - K Tanaka
- Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan.,SOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa, 240-0193, Japan
| | - Y Nakayama
- Graduate School of Advanced Integration Science, Chiba University, Chiba, 263-8522, Japan.,Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba-ken, 278-8510, Japan
| | - H Ishii
- Graduate School of Advanced Integration Science, Chiba University, Chiba, 263-8522, Japan
| | - N Ueno
- Graduate School of Advanced Integration Science, Chiba University, Chiba, 263-8522, Japan
| | - S Kera
- Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan. .,Graduate School of Advanced Integration Science, Chiba University, Chiba, 263-8522, Japan. .,SOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa, 240-0193, Japan.
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