Study on liquid crystal alignment characteristics by the surface treatment of hydrogenated amorphous carbon thin films

Dae Kyu Lee, Soon Joon Rho, Hong Koo Baik, Jeoung Yeon Hwang, Yong Min Jo, Dae Shik Seo, Se Jong Lee, Kie Moon Song

Research output: Contribution to journalLetter

12 Citations (Scopus)


Liquid crystal alignment characteristics were investigated using hydrogenated amorphous carbon (a-C:H) thin films. a-C:H thin films were deposited by a remote plasma-enhanced chemical vapor deposition (RPECVD) method using C2H2 and He gases. The surface property of a-C:H thin films was controlled by Ar ion beams. Ion beam irradiation results in the decrease of the optical band gap, the increase of the refractive index, and the increase of the P-base energy of a-C:H thin films. The liquid crystal alignment and pretilt angle were generated by ion beam irradiation. The pretilt angle was affected by the graphitization of a-C:H thin films and the P-base energy of a-C:H thin films.

Original languageEnglish
Pages (from-to)L1399-L1401
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number12 A
Publication statusPublished - 2002 Dec 1


All Science Journal Classification (ASJC) codes

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

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