期刊
CERAMICS INTERNATIONAL
卷 46, 期 7, 页码 8631-8639出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.12.096
关键词
Nickel oxide; Tungsten oxide; sol-gel coating; Flexible electrochromic device
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF2018R1A1A3A04076752]
- National Research Foundation of Korea [22A20130000202] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Electrochromic devices (ECDs) with reversible transmittance change represent a promising alternative to smart windows. However, the low-cost facile fabrication of ECDs, particularly flexible devices, remains challenging. In this study, novel NiO is synthesized by a solid state method, and the as-prepared NiO is introduced as an electrochromic anodic layer and fabricated onto a transparent conducive electrode (indium fin oxide, ITO or flexible silver nanowires, AgNW) by a sol-gel spin coating and low temperature annealing (80 degrees C-150 degrees C). The solvent, thickness of NiO, and annealing temperature are evaluated to obtain higher ECD performance. NiO/ITO ECDs exhibit very high transmittance variation (Delta T = similar to 84%) at 700 nm with applied potentials of -3.0 and 0 V. The stability and transmittance variation of NiO/ITO are significantly improved in the presence of a WO 3 cathodic electrode at lower applied voltages of 1.5 to 0 V. The low processing temperature of 80 degrees C demonstrates the potential of the flexible ECDs. The flexible NiO-WO3 device achieves a transmittance variation of similar to 38% at 700 nm with applied potential of 2.0 and 0 V, and retains the ECD performance. The application of low-cost solution - processed NiO and NiO/WO3-based ECDs in flexible transparent conducive electrodes provides a new pathway for the fabrication of optical devices and printed electronics.
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