Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Fabrication of the Solution-Derived BiAlO Thin Film by Using Brush Coating Process for Liquid Crystal Device

브러쉬 코팅 공정을 이용한 용액 기반 BiAlO 박막의 제작과 액정 소자에의 응용

  • Lee, Ju Hwan (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Kim, Dai-Hyun (Department of Smart Electric, Korea Polytechnic)
  • 이주환 (연세대학교 전기전자공학부) ;
  • 김대현 (한국폴리텍대학 스마트전기학과)
  • Received : 2021.05.15
  • Accepted : 2021.06.14
  • Published : 2021.09.01
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Abstract

We fabricated BiAlO thin film by a solution process with a brush coating to be used as liquid crystal (LC) alignment layer. Solution-processed BiAlO was coated on the glass substrate by brush process. Prepared thin films were annealed at different temperatures of 80℃, 180℃, and 280℃. To verify whether the BiAlO film was formed properly, X-ray photoelectron spectroscopy analysis was performed on Bi and Al. Using a crystal rotation method by polarized optical microscopy, LC alignment state was evaluated. At the annealing temperature of 280℃, the uniform homogenous LC alignment was achieved. To reveal the mechanism of LC alignment by brush coating, field emission scanning electron microscope was used. Through this analysis, spin-coated and brush coated film surface were compared. It was revealed that physical anisotropy was induced by brush coating at a high annealing temperature. Particles were aligned in one direction along which brush coating was made, resulting in a physical anisotropy that affects a uniform LC alignment. Therefore, it was confirmed that brush coating combined with BiAlO thin film annealed at high temperature has a significant potential for LC alignment.

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References

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