0.5 mm 이내의 두께를 갖는 4층 구조의 스마트 윈도우에 적용되는 전기변색 ECD(electro-chromic device) 필름 제조 및 특성
Characteristics of an electrochromic ECD (electro-chromic device) film in applications for smart windows with a 4-layer structure, a thickness of 0.5 mm
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
전기변색 (electrochromic devices, ECD) 방식을 이용하여 외부 전압 인가에 의해 착색된 상태에서 투명한 상태로 색 변화를 일으킬 수 있는 필름 형태의 스마트 윈도우를 제조하였다. 기존 유리 대신 투명 PET 필름을 기재로 사용하였고 ITO/Ag/ITO 전극층 , WO3/TIC2 유기변색층 , Nafion 전해질층을 차례로 도입한 이후 합지 공정을 통하여 총 두께가 50 μm 정도인 다층 박막 ECD 모듈을 제조하였다. 길이가 80mm 이상인 대면적의 ECD 모듈을 제조하기 위하여 스퍼터링, 바코팅, 열압축 공정을 최적화하였다. 보통 상태에서 54% 수준의 투과율을 보였으나 DC 3.5 V의 전압을 인가했을 때 24%까지 떨어졌으며 색 변화는 육안으로도 확인할 수 있었다. 가역적인 색 변화에 의해 외부 태양광을 선택적으로 차단할 수 있으며 냉난방에 필요한 에너지 저감 측면에서 효과적일 것으로 예상된다.
Abstract
Using electrochromic devices (ECD), smart window films that can change the colors from tinted state into transparent state by applying an external voltage were manufactured. Polyethylene terephthalate (PET) film was used as a substrate instead of conventional glass, and ECD modules having a total thickness of about 50 μm were manufactured by sequentially introducing an ITO/Ag/ITO electrode layer, a WO3/TIC2 organic discoloration layer, and a Nafion fluorine electrolyte layer. Through a series of sputtering, bar coating, and thermal compression processes, a large scale smart window with a horizontal and vertical length of more than 80 mm was manufactured. When DC 3.5 V was applied, the transmittance decreased from 54 % to 24 % and moreover the color change could be confirmed even with the naked eye. Reversible color change capability at low external voltage implies that external sunlight can be selectively blocked which is effective in terms of energy saving.
참고문헌 (16)
- Y. Ke, "Emerging thermal-responsive materials and integrated techniques targeting the energy-efficient smart window application", Adv. Funct. Mater, 28, pp.1800113~ (2018)
- C. G. Granqvis, "Towards the smart window : Progress in electrochromics", J. Non. Cryst. Solids, 218, pp.273~ (1997)
- N. M. Kumar, "Wearable smart glass: Features, applications, current progress and challenges", Proc. 2nd Int. Conf. Green Comput. Internet Things (ICGCIoT), pp.577~ (2022)
- H. S. Kim, "Technological advances and applications of liquid crystalline materials for automotive smart window", Polym. Sci. Technol, 25, pp.194~ (2014)
- M. H. Saeed, "Recent advances in the polymer dispersed liquid crystal composite and its applications", Molecules, 25, pp.5510~ (2020)
- A. Hemaida, "Evaluation of thermal performance for a smart switchable adaptive polymer dispersed liquid crystal(PDLC)glazing", Sol. Energy, 195, pp.185~ (2020)
- C. G. Granqvist, "Electrochromism and smart window design", Solid State Ion, 53, pp.479~ (1992)
- R. Vergaz, "Electrooptical behaviour and control of a suspended particle device", Opto-Electron. Rev, 15, pp.154~ (2007)
- S. Macher, "Large-area electrochromic devices on flexible polymer substrates with high optical contrast and enhanced cycling stability", Adv. Mater. Technol, 6, pp.2000836~ (2021)
- G. Yang, "Advances in nanomaterials for electrochromic devices", Chem. Soc. Rev, 49, pp.8687~ (2020)
- F. Feng, "An overview of electrochromic devices with electrolytes containing viologens", Sol. Energy Mater. Sol. Cells, 254, pp.112270~ (2023)
- R. Kumar, "Current status of some electrochromic materials and devices : a brief review", J. Phys. D, 54, pp.503002~ (2021)
- S. Y. Lee, "A study on the optimization of the ITO", Ag, J. Korean Inst. Electr. Electron. Mater. Eng, pp.2017, 30[DOI]
- S. K. Kang, "Actively operable thermoresponsive smart windows for reducing energy consumption", ACS Appl. Mater. Interfaces, 12, pp.33838~ (2020)
- C. I. Park, "High-coloration efficiency and low-power consumption electrochromic film based on multifunctional conducting polymer for large scale smart windows", ACS Appl. Electron. Mater, 3, pp.4781~ (2021)
- S. T. Kim, "Effects of oxygen partial pressure on the properties of indium Tin oxide film on PET substrates by RF magnetron sputtering", J. Korean Cryst. Growth Cryst. Technol, 24, pp.252~ (2014)