Homogeneous liquid crystal orientation on ion beam exposure TiO₂ surfaces depending on an anisotropic dipole field

Jin-Woo Lee Department of Electrical Engineering, Korea University, 5-1, Anam-dong, Sungbuk-gu, Seoul, 136–701, Republic of Korea

Byung-Moo Moon Department of Electrical Engineering, Korea University, 5-1, Anam-dong, Sungbuk-gu, Seoul, 136–701, Republic of KoreaCorrespondence[email protected]

Kang-Min Lee Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120–749, Korea

Young-Hwan Kim Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120–749, Korea

Hong-Gyu Park Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120–749, Korea

Ji-Hun Lim Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120–749, Korea

Byeong-Yun Oh Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120–749, Korea

Byoung-Yong Kim Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120–749, Korea

Jeong-Yeon Hwang Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120–749, Korea

Chul-Ho Ok Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120–749, Korea

Dae-Shik Seo Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120–749, KoreaCorrespondence[email protected]

Jeong-Min Han Department of Electronics, Seoul University, Seoildaehak-gil 22, Jungnang-gu, Seoul, 131–702, Republic of Korea

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Abstract

We studied homogeneous liquid crystal (LC) alignment properties on ion-beam (IB) irradiated TiO₂ films deposited by the electron beam evaporation method. Stable homogeneous LC alignment on a TiO₂ surface resulted from IB irradiation energy over 1800 eV. X-ray photoelectron spectroscopy analyses showed that Ti⁴⁺ 2p_3/2 and Ti⁴⁺ 2p_1/2 peaks were increased with increasing IB energy. Assuming that the increased peaks produced anisotropy dipole fields in the direction of the IB exposure process, we confirmed that the increasing IB energy induced strengthened the surface energy for entirely clear and stable LC molecule orientation. The voltage-transmittance characteristics of the twisted-nematic cell on the TiO₂ surface indicate that the TiO₂ film has potential for use as the LC alignment layer.

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Homogeneous liquid crystal orientation on ion beam exposure TiO₂ surfaces depending on an anisotropic dipole field

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Homogeneous liquid crystal orientation on ion beam exposure TiO₂ surfaces depending on an anisotropic dipole field