Cycle test and degradation analysis of WO3/PC+LiClO4/CeO2·TiO2 electrochromic device |
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| Authors: | Chang-Yeoul Kim Seong-Geun Cho Tae-Young Lim |
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| Affiliation: | aKorea Institute of Ceramic Engineering and Technology, Nanotechnology Convergence Team, 233-5 Gasan-dong Geumcheon-gu, 153-801 Korea, Republic of Korea;bSamsung Electronics Company, 250, 2-ga, Taeyong-ro, Jung-gu, Seoul 100-742, South Korea |
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| Abstract: | We fabricated an electrochromic full cell device adopting WO3 as a working electrode, and 1 M LiClO4 in PC with 3% water addition as an electrolyte and CeO2·TiO2 with various thicknesses as an ion storage layer. CeO2·TiO2 with less than 100 nm shows large charge density but the long-term cyclability is not good due to lithium ion diffusion into ITO thin film. Therefore, the thickness of CeO2·TiO2 ion storage layer should be coated at more than 200 mm/min. Long-term cycle test results show that CeO2·TiO2 ion storage layer with more than 150 nm thickness and two time coating enhance the long-term stability. SIMS analysis results show that the degradation is due to the remaining lithium ion in the working electrode, WO3. |
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| Keywords: | Cycle test Long-term stability Electrochromic device Ion storage layer CeO2· TiO2 Lithium ion diffusion |
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