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Molecular Crystals and Liquid Crystals Volume 529, 2010 - Issue 1: Proceedings of the 13th International Symposium on Advanced Display Materials and Devices (ADMD2009)
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Original Articles

Low-Voltage Driving of Liquid Crystals Vertically Aligned by Ion-Beam Bombardment on High-k HfO2 Surface

Lee-Gon Kim Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea
,
Won-Kyu Lee Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea
,
Byeong-Yun Oh Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea
,
Ji-Hun Lim Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea
,
Hyun-Jae Na Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea
,
Hong-Gyu Park Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea
,
Young-Hwan Kim Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea
,
Byoung-Yong Kim Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea
,
Young-Ku Kang Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea
,
Chul-Ho Ok Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea
,
Jeoung-Yeon Hwang Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea
,
Jeong-Min Han Department of Electronic, Seoil University, Jungnang-gu, Seoul, Korea
&
Dae-Shik Seo Department of Electrical & Electronic Engineering, College of Engineering, Yonsei University, Seodaemoon-gu, Seoul, KoreaCorrespondence[email protected]
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Pages 115-121 | Published online: 12 Nov 2010
 
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Abstract

Ion-beam irradiation (IB) on HfO2 surface induced high-performance liquid crystal (LC) driving at a 1-V threshold with vertical alignment of liquid crystals (LC). The high-k materials Atomic layer deposition was used to obtain LC orientation on ultrathin and high-quality films of HfO2 layers. To analyze surface morphological transition of HfO2 which can act as physical alignment effect of LC, atomic force microscopy images are employed with various IB intensities. The contact angle was measured to elucidate the mechanism of vertical alignment of LC on HfO2 with IB irradiation. Contact angle measurements show the surface energy changes via IB intensity increasing.

Acknowledgments

This research was supported by the MKE (The Ministry of Knowledge Economy), Korea under the ITRC (Information Technology Research Center) Support program supervised by the NIPA (National IT Industry Promotion Agency) (NIPA-2009-C1090-0902-0018).

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