Vertical liquid crystal orientation on amorphous tantalum pentoxide surfaces depending on anisotropic dipole-dipole interaction via ion beam irradiation

Jong Jin Lee, Hyung Jun Kim, Young Gu Kang, Young Hwan Kim, Hong Gyu Park, Byoung Yong Kim, Dae Shik Seo

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We achieved vertically aligned (VA) liquid crystals (LCs) on amorphous tantalum pentoxide (Ta2O5) alignment films deposited by radio frequency (rf) magnetron sputtering using ion beam (IB) irradiation. By analyzing measurements by X-ray photoelectron spectroscopy (XPS), we confirmed the bond breaking, as detected from the O 1s spectra, which caused an isotropic dipole-dipole interaction between the LC molecules and the Ta2O5 alignment film to uniformly align the vertical LC molecular orientation as a function of IB energy density. Moreover, by examining the electro-optical (EO) characteristics of the Ta2O5 surfaces compared with those of the polyimide (PI) alignment layer, we confirmed that Ta2O5 has a low threshold voltage and a low power consumption when used as an LC alignment layer.

Original languageEnglish
Article number031701
JournalJapanese journal of applied physics
Issue number3
Publication statusPublished - 2011 Mar 1


All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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