Surface modified solution-derived lanthanum-doped zinc oxide film for nematic liquid crystal system with free residual DC voltage
- Authors
- Lee, Ju Hwan; Kim, Eun-Mi; Heo, Gi-Seok; Jeong, Hae-Chang; Kim, Dong Hyun; Lee, Dong Wook; Han, Jeong-Min; Kim, Tae Wan; Seo, Dae-Shik
- Issue Date
- 1-Jul-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Ion-beam irradiation; Solution processing; Lanthanum-doped zinc oxide; Surface modification; Capacitance-voltage hysteresis
- Citation
- MATERIALS CHEMISTRY AND PHYSICS, v.213, pp.383 - 388
- Journal Title
- MATERIALS CHEMISTRY AND PHYSICS
- Volume
- 213
- Start Page
- 383
- End Page
- 388
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/3464
- DOI
- 10.1016/j.matchemphys.2018.04.023
- ISSN
- 0254-0584
- Abstract
- The liquid crystal (LC) alignment characteristics of the solution-derived lanthanum-doped zinc oxide (La:ZnO) film with ion-beam (IB) irradiation were investigated as a function of curing temperature. The best LC alignment state with uniform and homogeneous alignment was achieved at a curing temperature of 300 degrees C. To observe the effect of the IB irradiation on the La:ZnO film, physical and chemical surface analyses were conducted. Atomic-force microscopy revealed that surface roughness was increased, and the leptokurtic surface was changed to a platykurtic surface after the IB irradiation. X-ray photoelectron spectroscopy showed the breakage of the metal-oxide bonds, which induced an increase of oxygen vacancies. This caused van der Waals force, which strongly anchored LC molecules to the La:ZnO film. These results indicated that uniform and homogeneous LC alignment with the solution-derived La:ZnO films was induced by physical and chemical surface modification due to the IB irradiation. Moreover, residual DC was characterized by a capacitance-voltage hysteresis curve and nearly zero hysteresis was achieved. Therefore, IB irradiation is a useful method to achieve uniform and homogenous LC alignment, and using it with the solution-derived La:ZnO film exhibited potential for high-quality LC applications. (C) 2018 Elsevier B.V. All rights reserved.
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