Direct inkjet-patterning of energy efficient flexible electrochromics

High-quality patterns were successfully prepared by inkjet-printing WO3-PEDOT:PSS composites on different substrates including the rigid FTO glass and most importantly, on flexible PEDOT:PSS/Ag grid/PET. Excellent electrochromic performances can be achieved, including large optical modulation (85.7%...

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Main Authors: Cai, Guofa, Cheng, Xing, Layani, Michael, Tan, Alvin Wei Ming, Li, Shaohui, Eh, Alice Lee-Sie, Gao, Dace, Magdassi, Shlomo, Lee, Pooi See
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/139514
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1395142020-06-01T10:01:49Z Direct inkjet-patterning of energy efficient flexible electrochromics Cai, Guofa Cheng, Xing Layani, Michael Tan, Alvin Wei Ming Li, Shaohui Eh, Alice Lee-Sie Gao, Dace Magdassi, Shlomo Lee, Pooi See School of Materials Science & Engineering Engineering::Materials Flexible Electrochromic Display Inkjet-printing High-quality patterns were successfully prepared by inkjet-printing WO3-PEDOT:PSS composites on different substrates including the rigid FTO glass and most importantly, on flexible PEDOT:PSS/Ag grid/PET. Excellent electrochromic performances can be achieved, including large optical modulation (85.7% optical contrast at the wavelength of 633 nm on FTO glass substrate), fast switching speed (coloration/bleaching time of 2.4/0.8 s on the PEDOT:PSS/Ag grid/PET substrate), instantaneous coloration efficiency (68.8 cm2 C−1) and good cycling stability (up to 10,000 cycles). The effects of the applied potential window during electrochemical evaluation on the electrochromic performances were analyzed in detail. The printed electrochromics films on PEDOT:PSS/Ag grid/PET showed the best electrochemical stability, in agreement with its superior conductivity and transmittance at 633 nm of 0.6 Ω/sq and 66%, respectively. It sustained transmittance modulation of about 75.5% and 53.1% of its first cycle recorded contrast at 633 nm, after being subjected to 1000 and 5000 cycles, respectively, and maintained good electrochemical stability up to 10,000 cycles. Moreover, a robust mechanical stability was also achieved by the printed films on flexible PEDOT:PSS/Ag grid/PET substrate. The film maintained a transmittance modulation of 85.8% of its original contrast after 5000 bending cycles at a curvature radius of 1 cm. The inkjet-printed WO3 nanocomposite based flexible electrochromic displays exhibited excellent electrochromic performance, making it a promising candidate for energy efficient displays, e-books, e-cards and multifunctional electronic devices. NRF (Natl Research Foundation, S’pore) 2020-05-20T03:14:24Z 2020-05-20T03:14:24Z 2018 Journal Article Cai, G., Cheng, X., Layani, M., Tan, A. W. M., Li, S., Eh, A. L.-S., . . . Lee, P. S. (2018). Direct inkjet-patterning of energy efficient flexible electrochromics. Nano Energy, 49, 147-154. doi:10.1016/j.nanoen.2018.04.017 2211-2855 https://hdl.handle.net/10356/139514 10.1016/j.nanoen.2018.04.017 2-s2.0-85046023760 49 147 154 en Nano Energy © 2018 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Materials
Flexible Electrochromic Display
Inkjet-printing
spellingShingle Engineering::Materials
Flexible Electrochromic Display
Inkjet-printing
Cai, Guofa
Cheng, Xing
Layani, Michael
Tan, Alvin Wei Ming
Li, Shaohui
Eh, Alice Lee-Sie
Gao, Dace
Magdassi, Shlomo
Lee, Pooi See
Direct inkjet-patterning of energy efficient flexible electrochromics
description High-quality patterns were successfully prepared by inkjet-printing WO3-PEDOT:PSS composites on different substrates including the rigid FTO glass and most importantly, on flexible PEDOT:PSS/Ag grid/PET. Excellent electrochromic performances can be achieved, including large optical modulation (85.7% optical contrast at the wavelength of 633 nm on FTO glass substrate), fast switching speed (coloration/bleaching time of 2.4/0.8 s on the PEDOT:PSS/Ag grid/PET substrate), instantaneous coloration efficiency (68.8 cm2 C−1) and good cycling stability (up to 10,000 cycles). The effects of the applied potential window during electrochemical evaluation on the electrochromic performances were analyzed in detail. The printed electrochromics films on PEDOT:PSS/Ag grid/PET showed the best electrochemical stability, in agreement with its superior conductivity and transmittance at 633 nm of 0.6 Ω/sq and 66%, respectively. It sustained transmittance modulation of about 75.5% and 53.1% of its first cycle recorded contrast at 633 nm, after being subjected to 1000 and 5000 cycles, respectively, and maintained good electrochemical stability up to 10,000 cycles. Moreover, a robust mechanical stability was also achieved by the printed films on flexible PEDOT:PSS/Ag grid/PET substrate. The film maintained a transmittance modulation of 85.8% of its original contrast after 5000 bending cycles at a curvature radius of 1 cm. The inkjet-printed WO3 nanocomposite based flexible electrochromic displays exhibited excellent electrochromic performance, making it a promising candidate for energy efficient displays, e-books, e-cards and multifunctional electronic devices.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Cai, Guofa
Cheng, Xing
Layani, Michael
Tan, Alvin Wei Ming
Li, Shaohui
Eh, Alice Lee-Sie
Gao, Dace
Magdassi, Shlomo
Lee, Pooi See
format Article
author Cai, Guofa
Cheng, Xing
Layani, Michael
Tan, Alvin Wei Ming
Li, Shaohui
Eh, Alice Lee-Sie
Gao, Dace
Magdassi, Shlomo
Lee, Pooi See
author_sort Cai, Guofa
title Direct inkjet-patterning of energy efficient flexible electrochromics
title_short Direct inkjet-patterning of energy efficient flexible electrochromics
title_full Direct inkjet-patterning of energy efficient flexible electrochromics
title_fullStr Direct inkjet-patterning of energy efficient flexible electrochromics
title_full_unstemmed Direct inkjet-patterning of energy efficient flexible electrochromics
title_sort direct inkjet-patterning of energy efficient flexible electrochromics
publishDate 2020
url https://hdl.handle.net/10356/139514
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