Far- and mid-infrared FT-IR analysis of the single-crystal pentacene using a linearly polarized synchrotron radiation light source

Nakayama, Yasuo; Miyamoto, Junnosuke; Yamauchi, Kaname; Baba, Yuya; Teshima, Fumitsuna; Tanaka, Kiyohisa

doi:10.1016/j.vibspec.2024.103681

Vibrational Spectroscopy

2024

DOI: 10.1016/j.vibspec.2024.103681

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Far- and mid-infrared FT-IR analysis of the single-crystal pentacene using a linearly polarized synchrotron radiation light source

Yasuo Nakayama,

Junnosuke Miyamoto,

Kaname Yamauchi

et al.

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Cited by 2 publications

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Standing Orientation of Pentacene Promoted on Octadecyltrichlorosilane Self-Assembled Monolayers Revealed by pMAIRS

Nagai,

Shioya,

Hasegawa

et al. 2024

J. Phys. Chem. C

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Coating a substrate with a self-assembled monolayer (SAM) is known as an effective surface modification method for improving the quality of organic semiconductor films formed on it. However, there is still a lack of comprehensive understanding regarding the formation of molecular orientation on SAM surfaces. Highly ordered SAMs were prepared on SiO 2 substrates using octadecyltrichlorosilane (OTS). The temperature dependence of the molecular orientation of pentacene films prepared on the OTS substrates was investigated by p-polarized multiple-angle incidence resolution spectrometry (pMAIRS). It was found that pentacene molecules had standing orientations preferentially on the OTS surface regardless of the growth temperature. This indicates that the interaction between the OTS surface and the lying molecules is small, and the self-assembling of the molecules and the formation of standing-oriented crystallites are promoted even when the kinetic energy of depositing molecules is low.

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Standing Orientation of Pentacene Promoted on Octadecyltrichlorosilane Self-Assembled Monolayers Revealed by pMAIRS

Nagai,

Shioya,

Hasegawa

et al. 2024

J. Phys. Chem. C

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Synchrotron radiation Fourier-transform infrared absorption measurements on the single-crystal dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene

Nakayama,

Yamauchi,

Baba

et al. 2024

Jpn. J. Appl. Phys.

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The strong coupling of charge carriers with molecular vibrations is one essential characteristic of organic semiconductor materials as molecular solids. To address this question, fundamental solid-state properties of each molecular species are demanded not only for the electronic states but also for the vibrational characteristics. In the present study, Fourier-transform infrared absorption measurements were performed on single-crystal samples of dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) by using a linearly polarized synchrotron radiation light source. Molecular vibrational modes in a wavenumber range of 200 – 1600 cm−1 were reasonably assigned, and the Davydov splittings of several vibrational modes were resolved designating intermolecular couplings of two DNTT molecules in the unit cell.

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Far- and mid-infrared FT-IR analysis of the single-crystal pentacene using a linearly polarized synchrotron radiation light source

Cited by 2 publications

References 51 publications

Standing Orientation of Pentacene Promoted on Octadecyltrichlorosilane Self-Assembled Monolayers Revealed by pMAIRS

Standing Orientation of Pentacene Promoted on Octadecyltrichlorosilane Self-Assembled Monolayers Revealed by pMAIRS

Synchrotron radiation Fourier-transform infrared absorption measurements on the single-crystal dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene

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