Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 50, Issue 46, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aa8e88
Keywords
electrochemical devices; electrochromism; low-temperature fabrication; film characterization; tungsten trioxide
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Funding
- Creative Economy Leading Technology Development Program through Gyeongsangbuk-Do and Gyeongbuk Science & Technology Promotion Center of Korea [SF315012A]
- National Research Foundation of Korea (NRF) grant - Korea government (MSIT) [NRF-2016R1C1B2006296, NRF-2015R1C1A2A01053066]
- National Research Foundation of Korea [2016R1C1B2006296, 22A20130000202] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We investigated the effect of process conditions on the electrochromic (EC) properties of tungsten trioxide (WO3) films. When WO3 films deposited using a sol-gel method were thermally treated in air at 150 degrees C, the majority of tungsten species in the films became W6+, which is important for the realization of an optically transparent bleached state. On the other hand, annealing in a vacuum required only 60 degrees C to induce a similar level of W6+ in the WO3 films. However, a cracked film morphology was observed at higher temperatures, regardless of whether the films were annealed in air or vacuum. Using the WO3 films prepared under various conditions, EC devices (ECDs) were fabricated to evaluate EC properties. We concluded that the optimal annealing conditions for WO3 films for ECDs are 60 degrees C in vacuum, at which the highest coloration efficiency, largest transmittance difference, and fastest bleaching/coloration dynamics were obtained. These mild fabrication conditions at a low temperature (60 degrees C) provide the opportunity to utilize flexible electrodes on plastic. Therefore, we successfully demonstrated a flexible WO3-based ECD.
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